{"id":15624,"date":"2026-08-18T15:32:01","date_gmt":"2026-08-18T07:32:01","guid":{"rendered":"https:\/\/www.drillpipes.com\/how-does-%d0%b1%d1%83%d1%80%d0%b8%d0%bb%d1%8c%d0%bd%d0%b0%d1%8f-%d1%82%d1%80%d1%83%d0%b1%d0%b0-id-affect-%d0%bf%d0%be%d1%82%d0%b5%d1%80%d0%b8-%d0%b4%d0%b0%d0%b2%d0%bb%d0%b5%d0%bd%d0%b8%d1%8f-and\/"},"modified":"2026-09-18T15:58:49","modified_gmt":"2026-09-18T07:58:49","slug":"how-does-%d0%b1%d1%83%d1%80%d0%b8%d0%bb%d1%8c%d0%bd%d0%b0%d1%8f-%d1%82%d1%80%d1%83%d0%b1%d0%b0-id-affect-%d0%bf%d0%be%d1%82%d0%b5%d1%80%d0%b8-%d0%b4%d0%b0%d0%b2%d0%bb%d0%b5%d0%bd%d0%b8%d1%8f-and","status":"publish","type":"post","link":"https:\/\/www.drillpipes.com\/ru\/how-does-%d0%b1%d1%83%d1%80%d0%b8%d0%bb%d1%8c%d0%bd%d0%b0%d1%8f-%d1%82%d1%80%d1%83%d0%b1%d0%b0-id-affect-%d0%bf%d0%be%d1%82%d0%b5%d1%80%d0%b8-%d0%b4%d0%b0%d0%b2%d0%bb%d0%b5%d0%bd%d0%b8%d1%8f-and\/","title":{"rendered":"How Does \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 ID Affect \u043f\u043e\u0442\u0435\u0440\u0438 \u0434\u0430\u0432\u043b\u0435\u043d\u0438\u044f and \u0431\u0443\u0440\u0435\u043d\u0438\u0435 \u0433\u0438\u0440\u0430\u0432\u043b\u0438\u043a\u0430?"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><strong>Drill pipe pressure loss<\/strong> is closely related to the size of the internal flow passage inside the drill string. When the <strong>drill pipe ID<\/strong>, or internal diameter, becomes smaller, the same amount of drilling fluid has less space to pass through. Fluid velocity increases, and more pump pressure is required to overcome friction inside the pipe.<\/p>\n\n<p class=\"wp-block-paragraph\">This relationship is an important part of <strong>\u0431\u0443\u0440\u0435\u043d\u0438\u0435 \u0433\u0438\u0440\u0430\u0432\u043b\u0438\u043a\u0430<\/strong>, especially in \u0433\u043b\u0443\u0431\u043e\u043a\u0430\u044f \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430s, directional \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430s, and long \u0433\u043e\u0440\u0438\u0437\u043e\u043d\u0442\u0430\u043b\u044c\u043d\u044b\u0439 sections where \u0431\u0443\u0440\u043e\u0432\u043e\u0439 \u0440\u0430\u0441\u0442\u0432\u043e\u0440 must travel through a long \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u043a\u043e\u043b\u043e\u043d\u043d\u0430. However, the \u0442\u0440\u0443\u0431\u0430-body ID is not the only dimension that matters. Upset sections, \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435s, subs, and other down\u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430 components can also reduce the internal flow area and add \u043f\u043e\u0442\u0435\u0440\u0438 \u0434\u0430\u0432\u043b\u0435\u043d\u0438\u044f.<\/p>\n\n<h2 class=\"wp-block-heading\">Why \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 ID Matters for \u0431\u0443\u0440\u0435\u043d\u0438\u0435 \u0433\u0438\u0440\u0430\u0432\u043b\u0438\u043a\u0430<\/h2>\n\n<p class=\"wp-block-paragraph\">The basic relationship is simple: \u0431\u0443\u0440\u043e\u0432\u043e\u0439 \u0440\u0430\u0441\u0442\u0432\u043e\u0440 must pass through the internal bore of the \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430.<\/p>\n\n<p class=\"wp-block-paragraph\">The internal flow area can be calculated as:<\/p>\n\n<p class=\"wp-block-paragraph\"><strong>Flow Area = 3.1416 \u00d7 D\u00b2 \/ 4<\/strong><\/p>\n\n<p class=\"wp-block-paragraph\">where:<\/p>\n\n<ul class=\"wp-block-list\">\n<li><strong>Flow Area<\/strong> = internal area available for fluid flow<\/li>\n\n\n\n<li><strong>D<\/strong> = internal diameter<\/li>\n<\/ul>\n\n<p class=\"wp-block-paragraph\">Average fluid velocity can then be calculated as:<\/p>\n\n<p class=\"wp-block-paragraph\"><strong>Average Fluid Velocity = Flow Rate \/ Flow Area<\/strong><\/p>\n\n<p class=\"wp-block-paragraph\">This means that when the internal dia\u043c\u0435\u0442\u0440 becomes smaller, the flow area decreases. If the \u043d\u0430\u0441\u043e\u0441 continues delivering the same flow rate, the fluid has to move faster through the smaller passage.<\/p>\n\n<p class=\"wp-block-paragraph\">A higher fluid velocity normally creates more \u0442\u0440\u0435\u043d\u0438\u0435 against the inside wall of the \u0442\u0440\u0443\u0431\u0430, increasing <strong>\u043f\u043e\u0442\u0435\u0440\u0438 \u0434\u0430\u0432\u043b\u0435\u043d\u0438\u044f inside \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430<\/strong>.<\/p>\n\n<p class=\"wp-block-paragraph\">The following example shows how internal dia\u043c\u0435\u0442\u0440 changes fluid velocity at the same \u0446\u0438\u0440\u043a\u0443\u043b\u044f\u0446\u0438\u044f rate.<\/p>\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Internal Dia\u043c\u0435\u0442\u0440<\/th><th>Internal Flow Area<\/th><th>Fluid Velocity at 500 gal\/min<\/th><th>Relative Velocity<\/th><\/tr><\/thead><tbody><tr><td>2.75 in.<\/td><td>5.94 in\u00b2<\/td><td>27.01 ft\/s<\/td><td>1.86\u00d7<\/td><\/tr><tr><td>3.00 in.<\/td><td>7.07 in\u00b2<\/td><td>22.69 ft\/s<\/td><td>1.56\u00d7<\/td><\/tr><tr><td>3.25 in.<\/td><td>8.30 in\u00b2<\/td><td>19.34 ft\/s<\/td><td>1.33\u00d7<\/td><\/tr><tr><td>3.50 in.<\/td><td>9.62 in\u00b2<\/td><td>16.67 ft\/s<\/td><td>1.15\u00d7<\/td><\/tr><tr><td>3.75 in.<\/td><td>11.04 in\u00b2<\/td><td>14.52 ft\/s<\/td><td>1.00\u00d7<\/td><\/tr><\/tbody><\/table><\/figure>\n\n<p class=\"wp-block-paragraph\">The example uses the same 500 gal\/min flow rate for every dia\u043c\u0435\u0442\u0440. It only shows the effect of ID on flow area and velocity. Actual \u043f\u043e\u0442\u0435\u0440\u0438 \u0434\u0430\u0432\u043b\u0435\u043d\u0438\u044f also depends on \u0442\u0440\u0443\u0431\u0430 length, \u0431\u0443\u0440\u0435\u043d\u0438\u0435-fluid properties, internal surface condition, and other restrictions in the \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u043a\u043e\u043b\u043e\u043d\u043d\u0430.<\/p>\n\n<figure class=\"wp-block-gallery has-nested-images columns-default is-cropped wp-block-gallery-1 is-layout-flex wp-block-gallery-is-layout-flex\">\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"768\" height=\"1024\" data-id=\"14274\" src=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/drill-pipe-tool-joint-id-inspection-768x1024.jpg\" alt=\"\" class=\"wp-image-14274\" srcset=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/drill-pipe-tool-joint-id-inspection-768x1024.jpg 768w, https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/drill-pipe-tool-joint-id-inspection-225x300.jpg 225w, https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/drill-pipe-tool-joint-id-inspection-2000x2667.jpg 2000w, https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/drill-pipe-tool-joint-id-inspection-scaled.jpg 1920w\" sizes=\"auto, (max-width: 768px) 100vw, 768px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"768\" height=\"1024\" data-id=\"14272\" src=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/api-5dp-drill-pipe-tool-joint-768x1024.jpg\" alt=\"\" class=\"wp-image-14272\" srcset=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/api-5dp-drill-pipe-tool-joint-768x1024.jpg 768w, https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/api-5dp-drill-pipe-tool-joint-225x300.jpg 225w, https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/api-5dp-drill-pipe-tool-joint-2000x2667.jpg 2000w, https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/api-5dp-drill-pipe-tool-joint-scaled.jpg 1920w\" sizes=\"auto, (max-width: 768px) 100vw, 768px\" \/><\/figure>\n<\/figure>\n\n<h2 class=\"wp-block-heading\">Where \u043d\u0430\u0441\u043e\u0441 Pressure Is Used During \u0446\u0438\u0440\u043a\u0443\u043b\u044f\u0446\u0438\u044f<\/h2>\n\n<p class=\"wp-block-paragraph\">The pressure measured at the \u0441\u0432\u0435\u0447\u0430\u0442\u0440\u0443\u0431\u0430 does not represent \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u043f\u043e\u0442\u0435\u0440\u0438 \u0434\u0430\u0432\u043b\u0435\u043d\u0438\u044f alone.<\/p>\n\n<p class=\"wp-block-paragraph\">The \u0431\u0443\u0440\u043e\u0432\u043e\u0439 \u0440\u0430\u0441\u0442\u0432\u043e\u0440 \u043d\u0430\u0441\u043e\u0441s must provide enough pressure to move \u0431\u0443\u0440\u043e\u0432\u043e\u0439 \u0440\u0430\u0441\u0442\u0432\u043e\u0440 through the complete \u0446\u0438\u0440\u043a\u0443\u043b\u044f\u0446\u0438\u044f system. Pressure is gradually lost as the fluid passes through different sections of the \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430.<\/p>\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Section<\/th><th>Why Pressure Is Lost<\/th><\/tr><\/thead><tbody><tr><td>Surface lines<\/td><td>\u0442\u0440\u0435\u043d\u0438\u0435 through the \u0441\u0432\u0435\u0447\u0430\u0442\u0440\u0443\u0431\u0430, hose and surface piping<\/td><\/tr><tr><td>\u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430<\/td><td>\u0442\u0440\u0435\u043d\u0438\u0435 along the internal bore<\/td><\/tr><tr><td>Upset sections<\/td><td>Smaller internal passage and changing flow area<\/td><\/tr><tr><td>\u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435s<\/td><td>Local restriction co\u041c\u041f\u0430red with the \u0442\u0440\u0443\u0431\u0430 body<\/td><\/tr><tr><td>Down\u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430 tools<\/td><td>Flow restrictions through the bottom-\u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430 assembly<\/td><\/tr><tr><td>Bit nozzles<\/td><td>High-velocity flow through small nozzle openings<\/td><\/tr><tr><td>Annulus<\/td><td>\u0442\u0440\u0435\u043d\u0438\u0435 as \u0431\u0443\u0440\u043e\u0432\u043e\u0439 \u0440\u0430\u0441\u0442\u0432\u043e\u0440 returns to surface around the \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u043a\u043e\u043b\u043e\u043d\u043d\u0430<\/td><\/tr><\/tbody><\/table><\/figure>\n\n<p class=\"wp-block-paragraph\">For this reason, a high \u043d\u0430\u0441\u043e\u0441 pressure does not automatically mean the \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 ID is too small.<\/p>\n\n<p class=\"wp-block-paragraph\">The complete system has to be reviewed before deciding where the main restriction is located.<\/p>\n\n<h2 class=\"wp-block-heading\">Why a Smaller ID Creates More \u043f\u043e\u0442\u0435\u0440\u0438 \u0434\u0430\u0432\u043b\u0435\u043d\u0438\u044f<\/h2>\n\n<p class=\"wp-block-paragraph\">The easiest way to under\u0441\u0432\u0435\u0447\u0430 <strong>\u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u0442\u0440\u0435\u043d\u0438\u0435 \u043f\u043e\u0442\u0435\u0440\u0438 \u0434\u0430\u0432\u043b\u0435\u043d\u0438\u044f<\/strong> is to think about fluid moving through a narrow passage.<\/p>\n\n<p class=\"wp-block-paragraph\">When the passage becomes smaller:<\/p>\n\n<ul class=\"wp-block-list\">\n<li>the available flow area decreases;<\/li>\n\n\n\n<li>the \u0431\u0443\u0440\u043e\u0432\u043e\u0439 \u0440\u0430\u0441\u0442\u0432\u043e\u0440 moves faster;<\/li>\n\n\n\n<li>\u0442\u0440\u0435\u043d\u0438\u0435 against the internal surface increases;<\/li>\n\n\n\n<li>more pressure is needed to maintain the same flow rate.<\/li>\n<\/ul>\n\n<p class=\"wp-block-paragraph\">The same effect becomes stronger when the \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u043a\u043e\u043b\u043e\u043d\u043d\u0430 is long because \u0442\u0440\u0435\u043d\u0438\u0435 continues along the entire internal surface.<\/p>\n\n<p class=\"wp-block-paragraph\">Several operating conditions can therefore change \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u043f\u043e\u0442\u0435\u0440\u0438 \u0434\u0430\u0432\u043b\u0435\u043d\u0438\u044f.<\/p>\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Para\u043c\u0435\u0442\u0440<\/th><th>Change<\/th><th>Typical Hydraulic Effect<\/th><\/tr><\/thead><tbody><tr><td>\u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 ID<\/td><td>Decreases<\/td><td>Flow velocity increases; internal \u043f\u043e\u0442\u0435\u0440\u0438 \u0434\u0430\u0432\u043b\u0435\u043d\u0438\u044f generally increases<\/td><\/tr><tr><td>Flow rate<\/td><td>Increases<\/td><td>Fluid velocity and \u0442\u0440\u0435\u043d\u0438\u0435 \u043f\u043e\u0442\u0435\u0440\u0438 \u0434\u0430\u0432\u043b\u0435\u043d\u0438\u044f increase<\/td><\/tr><tr><td>\u0431\u0443\u0440-\u043a\u043e\u043b\u043e\u043d\u043d\u0430 length<\/td><td>Increases<\/td><td>\u0442\u0440\u0435\u043d\u0438\u0435 accumulates over a longer flow path<\/td><\/tr><tr><td>\u0431\u0443\u0440\u0435\u043d\u0438\u0435-fluid viscosity<\/td><td>Increases<\/td><td>More pressure is required to maintain the same \u0446\u0438\u0440\u043a\u0443\u043b\u044f\u0446\u0438\u044f rate<\/td><\/tr><tr><td>Internal surface roughness<\/td><td>Increases<\/td><td>\u0442\u0440\u0435\u043d\u0438\u0435 against the \u0442\u0440\u0443\u0431\u0430 wall can increase<\/td><\/tr><tr><td>\u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 ID<\/td><td>Decreases<\/td><td>Creates a repeated local restriction at each \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435<\/td><\/tr><tr><td>Number of \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435s<\/td><td>Increases<\/td><td>More tool-\u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 restrictions are added along the \u043a\u043e\u043b\u043e\u043d\u043d\u0430<\/td><\/tr><\/tbody><\/table><\/figure>\n\n<h2 class=\"wp-block-heading\">How \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 ID Affects Flow<\/h2>\n\n<p class=\"wp-block-paragraph\">A finished \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 does not have the same internal dia\u043c\u0435\u0442\u0440 from end to end. \u0431\u0443\u0440\u043e\u0432\u043e\u0439 \u0440\u0430\u0441\u0442\u0432\u043e\u0440 moves through the \u0442\u0440\u0443\u0431\u0430 body, upset section, and \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435, and the bore size can change between these areas.<\/p>\n\n<p class=\"wp-block-paragraph\">The <strong>\u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 ID<\/strong> is particularly important because the \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 is the thicker \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 section at each end of the \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430. Its bore may be smaller than the \u0442\u0440\u0443\u0431\u0430-body ID, creating a local restriction in the internal flow path.<\/p>\n\n<p class=\"wp-block-paragraph\">When \u0431\u0443\u0440\u043e\u0432\u043e\u0439 \u0440\u0430\u0441\u0442\u0432\u043e\u0440 enters this smaller bore, its velocity increases. The flow then expands again as it enters the larger bore of the next section. Although the \u043f\u043e\u0442\u0435\u0440\u0438 \u0434\u0430\u0432\u043b\u0435\u043d\u0438\u044f across a \u043e\u0434\u0438\u043d\u043e\u0447\u043a\u0430 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 may be relatively small, the same restriction is repeated at every \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 along the \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u043a\u043e\u043b\u043e\u043d\u043d\u0430. In a long \u043a\u043e\u043b\u043e\u043d\u043d\u0430, these repeated losses can become significant.<\/p>\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/drill-pipe-tool-joint-id-internal-flow-path-cutaway-1024x576.jpg\" alt=\"\" class=\"wp-image-14287\" style=\"width:884px;height:auto\" srcset=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/drill-pipe-tool-joint-id-internal-flow-path-cutaway-1024x576.jpg 1024w, https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/drill-pipe-tool-joint-id-internal-flow-path-cutaway-300x169.jpg 300w, https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/drill-pipe-tool-joint-id-internal-flow-path-cutaway.jpg 1672w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n<p class=\"wp-block-paragraph\">\u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 ID deserves closer attention when:<\/p>\n\n<ul class=\"wp-block-list\">\n<li>the \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430 has a long measured depth;<\/li>\n\n\n\n<li>high \u0446\u0438\u0440\u043a\u0443\u043b\u044f\u0446\u0438\u044f rates are required;<\/li>\n\n\n\n<li>the \u0431\u0443\u0440\u043e\u0432\u043e\u0439 \u0440\u0430\u0441\u0442\u0432\u043e\u0440 has relatively high viscosity;<\/li>\n\n\n\n<li>available \u043d\u0430\u0441\u043e\u0441 pressure is limited;<\/li>\n\n\n\n<li>the \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u043a\u043e\u043b\u043e\u043d\u043d\u0430 contains a large number of \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435s;<\/li>\n\n\n\n<li>maintaining hydraulic performance at the bit is important.<\/li>\n<\/ul>\n\n<p class=\"wp-block-paragraph\">For this reason, hydraulic calculations should not rely on \u0442\u0440\u0443\u0431\u0430-body ID alone. The <strong>\u0442\u0440\u0443\u0431\u0430-body ID, upset bore, and \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 ID<\/strong> should be reviewed together when estimating the internal flow path and <strong>\u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u043f\u043e\u0442\u0435\u0440\u0438 \u0434\u0430\u0432\u043b\u0435\u043d\u0438\u044f<\/strong>.<\/p>\n\n<p class=\"wp-block-paragraph\">A larger \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 bore can reduce hydraulic restriction, but simply increasing the ID is not always the best solution. The \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 must still retain enough material to meet the required \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 strength, \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 capacity, \u0438\u0437\u043d\u043e\u0441 allowance, and service conditions. Hydraulic performance and mechanical strength therefore need to be considered together during \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 selection. For a closer look at pin-box structure, \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 designations, \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 dimensions, and inspection points, refer to the <strong>API \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435s Reference<\/strong>.<\/p>\n\n<div data-wp-interactive=\"core\/file\" class=\"wp-block-file\"><object data-wp-bind--hidden=\"!state.hasPdfPreview\" hidden class=\"wp-block-file__embed\" data=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/API_Drill_Pipe_Connections_Engineering_Reference-3.pdf\" type=\"application\/pdf\" style=\"width:100%;height:600px\" aria-label=\"\u0412\u0441\u0442\u0430\u0432\u043a\u0430 API Drill Pipe Connections Engineering Reference\"><\/object><a id=\"wp-block-file--media-7f6eaa32-7745-468a-bdac-ddc3609d356e\" href=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/API_Drill_Pipe_Connections_Engineering_Reference-3.pdf\">API \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435s Engineering Reference<\/a><a href=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/API_Drill_Pipe_Connections_Engineering_Reference-3.pdf\" class=\"wp-block-file__button wp-element-button\" download=\"\" aria-describedby=\"wp-block-file--media-7f6eaa32-7745-468a-bdac-ddc3609d356e\">Download<\/a><\/div>\n\n<h2 class=\"wp-block-heading\">Hydraulic Performance and Mechanical Strength Must Be Balanced<\/h2>\n\n<p class=\"has-primary-color has-text-color has-link-color wp-elements-1 wp-block-paragraph\">Increasing the internal bore can reduce flow resistance, but \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 dimensions cannot be selected for hydraulic performance alone. The \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 still needs enough material to carry \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 and tensile loads, with\u0441\u0432\u0435\u0447\u0430 repeated make-up and break-out, and provide adequate \u0438\u0437\u043d\u043e\u0441 and \u0443\u0441\u0442\u0430\u043b\u043e\u0441\u0442\u044c resistance. <strong><a href=\"__PROTECTED_0__\">API 5DP \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u043a\u043b\u0430\u0441\u0441s<\/a><\/strong> should therefore be reviewed together with \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 and \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 requirements rather than by \u0442\u0440\u0443\u0431\u0430-body strength alone.<\/p>\n\n<p class=\"wp-block-paragraph\">This creates a practical trade-off. A larger \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 ID improves the internal flow path, while a smaller bore leaves more material around the \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435. The final geometry therefore has to satisfy both hydraulic and mechanical requirements.<\/p>\n\n<p class=\"wp-block-paragraph\">For \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 selection, the objective is not to maximize ID, but to provide enough internal flow area without reducing the required \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 capacity.<\/p>\n\n<h2 class=\"wp-block-heading\">Why the Effect Becomes More Important in Deep and Directional \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430s<\/h2>\n\n<p class=\"wp-block-paragraph\">As measured depth increases, \u0431\u0443\u0440\u043e\u0432\u043e\u0439 \u0440\u0430\u0441\u0442\u0432\u043e\u0440 has to travel through a longer internal flow path before reaching the BHA and bit. That longer path adds \u0442\u0440\u0435\u043d\u0438\u0435 along the \u0442\u0440\u0443\u0431\u0430 wall and also increases the number of \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435s, upset sections, and other bore changes the fluid must pass through.<\/p>\n\n<p class=\"wp-block-paragraph\">For this reason, <strong>\u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u043f\u043e\u0442\u0435\u0440\u0438 \u0434\u0430\u0432\u043b\u0435\u043d\u0438\u044f<\/strong> becomes more significant in deep, directional, and extended-reach \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430s. A restriction that has little influence in a short \u043a\u043e\u043b\u043e\u043d\u043d\u0430 can have a much larger cumulative effect when it is repeated across dozens or hundreds of \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435s.<\/p>\n\n<p class=\"wp-block-paragraph\">The hydraulic i\u041c\u041f\u0430ct is usually greater when the \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430 combines:<\/p>\n\n<ul class=\"wp-block-list\">\n<li>long measured depth or extended \u0433\u043e\u0440\u0438\u0437\u043e\u043d\u0442\u0430\u043b\u044c\u043d\u044b\u0439 sections;<\/li>\n\n\n\n<li>high \u0446\u0438\u0440\u043a\u0443\u043b\u044f\u0446\u0438\u044f rates;<\/li>\n\n\n\n<li>relatively viscous \u0431\u0443\u0440\u043e\u0432\u043e\u0439 \u0440\u0430\u0441\u0442\u0432\u043e\u0440;<\/li>\n\n\n\n<li>restricted \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 IDs or upset bores;<\/li>\n\n\n\n<li>a large number of \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435s;<\/li>\n\n\n\n<li>limited \u0441\u0432\u0435\u0447\u0430\u0442\u0440\u0443\u0431\u0430 pressure margin;<\/li>\n\n\n\n<li>high pressure demand through the BHA and bit.<\/li>\n<\/ul>\n\n<p class=\"wp-block-paragraph\">Under these conditions, unnecessary restrictions inside the \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u043a\u043e\u043b\u043e\u043d\u043d\u0430 can consume pressure that would otherwise be available farther down the \u0446\u0438\u0440\u043a\u0443\u043b\u044f\u0446\u0438\u044f system. \u0442\u0440\u0443\u0431\u0430-body ID, upset bore, and \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 ID therefore need to be considered together rather than treating the nominal \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 size as the only hydraulic input.<\/p>\n\n<p class=\"wp-block-paragraph\">A larger <strong>\u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 ID<\/strong> can reduce internal flow resistance, but hydraulic performance cannot be optimized independently of mechanical design. \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 strength, \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 geometry, \u0438\u0437\u043d\u043e\u0441 allowance, and operating loads still have to be satisfied.<\/p>\n\n<h2 class=\"wp-block-heading\">Why Two \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430s with the Same OD Can Perform Differently<\/h2>\n\n<p class=\"wp-block-paragraph\">Two \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430s with the same \u043d\u0430\u0440\u0443\u0436\u043d\u044b\u0439 \u0434\u0438\u0430\u043c\u0435\u0442\u0440 do not necessarily provide the same internal flow path. The reason is simple: <strong>OD describes the outside size of the \u0442\u0440\u0443\u0431\u0430, while hydraulic performance depends mainly on the space available inside the \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u043a\u043e\u043b\u043e\u043d\u043d\u0430.<\/strong><\/p>\n\n<p class=\"wp-block-paragraph\">\u0442\u043e\u043b\u0449\u0438\u043d\u0430 \u0441\u0442\u0435\u043d\u043a\u0438 is the first difference to check. For example, 5-\u0434\u044e\u0439\u043c \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 can be supplied with different \u0442\u043e\u043b\u0449\u0438\u043d\u0430 \u0441\u0442\u0435\u043d\u043a\u0438es depending on the required \u0442\u0440\u0443\u0431\u0430 \u0432\u0435\u0441 and mechanical capacity. A thicker wall leaves a smaller \u0442\u0440\u0443\u0431\u0430-body ID even though the \u043d\u0430\u0440\u0443\u0436\u043d\u044b\u0439 \u0434\u0438\u0430\u043c\u0435\u0442\u0440 remains 5 \u0434\u044e\u0439\u043ces.<\/p>\n\n<p class=\"wp-block-paragraph\">The effect can be seen from the geometry alone:<\/p>\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>5 in. \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 Example<\/th><th>Thinner-Wall Configuration<\/th><th>Heavier-Wall Configuration<\/th><\/tr><\/thead><tbody><tr><td>\u0442\u0440\u0443\u0431\u0430 OD<\/td><td>127.0 mm \/ 5.000 in.<\/td><td>127.0 mm \/ 5.000 in.<\/td><\/tr><tr><td>\u0442\u043e\u043b\u0449\u0438\u043d\u0430 \u0441\u0442\u0435\u043d\u043a\u0438<\/td><td>9.19 mm<\/td><td>12.70 mm<\/td><\/tr><tr><td>Approx. \u0442\u0440\u0443\u0431\u0430-Body ID<\/td><td>108.62 mm \/ 4.276 in.<\/td><td>101.60 mm \/ 4.000 in.<\/td><\/tr><tr><td>Approx. Internal Flow Area<\/td><td>14.36 in\u00b2<\/td><td>12.57 in\u00b2<\/td><\/tr><tr><td>Relative Fluid Velocity at the Same Flow Rate<\/td><td>1.00\u00d7<\/td><td>1.14\u00d7<\/td><\/tr><\/tbody><\/table><\/figure>\n\n<p class=\"wp-block-paragraph\">The values above illustrate the geometric effect of the wall-thickness range listed for 5-\u0434\u044e\u0439\u043c \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430. Actual project configurations should always be checked against the ordered size, nominal \u0432\u0435\u0441, and approved product specification.<\/p>\n\n<p class=\"wp-block-paragraph\">This means that, at the same \u0446\u0438\u0440\u043a\u0443\u043b\u044f\u0446\u0438\u044f rate, the heavier-wall example provides about <strong>12.5% less internal flow area<\/strong>, so the \u0431\u0443\u0440\u043e\u0432\u043e\u0439 \u0440\u0430\u0441\u0442\u0432\u043e\u0440 must move about <strong>14% faster<\/strong> through the \u0442\u0440\u0443\u0431\u0430 body. Higher velocity does not by itself define the final \u043f\u043e\u0442\u0435\u0440\u0438 \u0434\u0430\u0432\u043b\u0435\u043d\u0438\u044f, but it generally increases \u0442\u0440\u0435\u043d\u0438\u0435al resistance and therefore increases the pressure required to circulate the fluid through a long \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u043a\u043e\u043b\u043e\u043d\u043d\u0430.<\/p>\n\n<p class=\"wp-block-paragraph\">The difference does not stop at the \u0442\u0440\u0443\u0431\u0430 body.<\/p>\n\n<p class=\"wp-block-paragraph\">A complete \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 also contains upset sections and \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435s. Their internal bores can be smaller than the main \u0442\u0440\u0443\u0431\u0430-body ID, creating additional restrictions every time the fluid passes through a \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435. The hydraulic path is therefore better represented as:<\/p>\n\n<p class=\"wp-block-paragraph\">The hydraulic co\u041c\u041f\u0430rison therefore has to follow the complete internal flow path\u2014from the \u0442\u0440\u0443\u0431\u0430-body ID through the upset bore and \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 ID\u2014rather than stopping at nominal OD.<\/p>\n\n<p class=\"wp-block-paragraph\">This is especially important in long or extended-reach \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430s. A small restriction at one \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 may have a limited effect, but the same geometry is repeated through dozens or hundreds of \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435s.<\/p>\n\n<p class=\"wp-block-paragraph\">Published 5-\u0434\u044e\u0439\u043c, 25.6 lb\/ft S135 \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 configurations also show that the <strong>\u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 ID can vary substantially even when \u0442\u0440\u0443\u0431\u0430 OD, nominal \u0432\u0435\u0441, and \u043a\u043b\u0430\u0441\u0441 remain the same<\/strong>. Depending on the \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 design, published tool-\u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 IDs range from 2.75 in. to 3.625 in.<\/p>\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 ID Example<\/th><th>Internal Flow Area<\/th><th>Relative Velocity at the Same Flow Rate<\/th><\/tr><\/thead><tbody><tr><td>2.750 in.<\/td><td>5.94 in\u00b2<\/td><td>1.74\u00d7<\/td><\/tr><tr><td>3.250 in.<\/td><td>8.30 in\u00b2<\/td><td>1.24\u00d7<\/td><\/tr><tr><td>3.500 in.<\/td><td>9.62 in\u00b2<\/td><td>1.07\u00d7<\/td><\/tr><tr><td>3.625 in.<\/td><td>10.32 in\u00b2<\/td><td>1.00\u00d7<\/td><\/tr><\/tbody><\/table><\/figure>\n\n<p class=\"wp-block-paragraph\">This co\u041c\u041f\u0430rison does <strong>not<\/strong> mean that the \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 with the largest bore is automatically the best choice. Tool-\u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 dimensions also affect \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 strength, \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 capacity, \u0438\u0437\u043d\u043e\u0441 allowance, and co\u041c\u041f\u0430tibility with the rest of the \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u043a\u043e\u043b\u043e\u043d\u043d\u0430.<\/p>\n\n<p class=\"wp-block-paragraph\">For hydraulic co\u041c\u041f\u0430rison, engineers should check at least:<\/p>\n\n<ul class=\"wp-block-list\">\n<li>\u0442\u0440\u0443\u0431\u0430-body \u0442\u043e\u043b\u0449\u0438\u043d\u0430 \u0441\u0442\u0435\u043d\u043a\u0438 and ID;<\/li>\n\n\n\n<li>upset bore;<\/li>\n\n\n\n<li>\u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 ID;<\/li>\n\n\n\n<li>\u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 design;<\/li>\n\n\n\n<li>total \u0431\u0443\u0440-\u043a\u043e\u043b\u043e\u043d\u043d\u0430 length;<\/li>\n\n\n\n<li>planned \u0446\u0438\u0440\u043a\u0443\u043b\u044f\u0446\u0438\u044f rate.<\/li>\n<\/ul>\n\n<p class=\"wp-block-paragraph\">Nominal OD is therefore only the starting point. For <strong>API 5DP \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430<\/strong>, the \u0442\u0440\u0443\u0431\u0430-body dimensions and tool-\u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 configuration should be reviewed together before estimating <strong>\u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u043f\u043e\u0442\u0435\u0440\u0438 \u0434\u0430\u0432\u043b\u0435\u043d\u0438\u044f<\/strong> or co\u041c\u041f\u0430ring hydraulic performance.<\/p>\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/same-od-different-drill-pipe-id-cutaway-comparison-1024x576.jpg\" alt=\"\" class=\"wp-image-14288\" style=\"width:853px;height:auto\" srcset=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/same-od-different-drill-pipe-id-cutaway-comparison-1024x576.jpg 1024w, https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/same-od-different-drill-pipe-id-cutaway-comparison-300x169.jpg 300w, https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/same-od-different-drill-pipe-id-cutaway-comparison.jpg 1672w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n<h2 class=\"wp-block-heading\">How to Review \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 for Hydraulic Performance<\/h2>\n\n<p class=\"wp-block-paragraph\">When co\u041c\u041f\u0430ring \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 for a project, the hydraulic review should start with the actual dimensions of the complete \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 assembly.<\/p>\n\n<p class=\"wp-block-paragraph\">A useful hydraulic review should combine the actual \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 dimensions with the planned operating conditions.<\/p>\n\n<p class=\"wp-block-paragraph\">These dimensions should then be reviewed together with operating conditions.<\/p>\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Review Item<\/th><th>What to Confirm<\/th><\/tr><\/thead><tbody><tr><td>Planned flow rate<\/td><td>Expected \u0431\u0443\u0440\u0435\u043d\u0438\u0435-fluid \u0446\u0438\u0440\u043a\u0443\u043b\u044f\u0446\u0438\u044f rate<\/td><\/tr><tr><td>\u0442\u0440\u0443\u0431\u0430-body ID<\/td><td>Main internal flow area<\/td><\/tr><tr><td>\u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 ID<\/td><td>Repeated restriction through \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435s<\/td><\/tr><tr><td>Upset bore<\/td><td>Local restriction between \u0442\u0440\u0443\u0431\u0430 body and \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435<\/td><\/tr><tr><td>\u0431\u0443\u0440-\u043a\u043e\u043b\u043e\u043d\u043d\u0430 length<\/td><td>Distance over which internal \u0442\u0440\u0435\u043d\u0438\u0435 occurs<\/td><\/tr><tr><td>\u0431\u0443\u0440\u043e\u0432\u043e\u0439 \u0440\u0430\u0441\u0442\u0432\u043e\u0440<\/td><td>Density and flow characteristics<\/td><\/tr><tr><td>Down\u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430 tools<\/td><td>Additional internal restrictions<\/td><\/tr><tr><td>Bit configuration<\/td><td>Pressure required across the bit<\/td><\/tr><tr><td>\u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430 geometry<\/td><td>Influences return-flow \u043f\u043e\u0442\u0435\u0440\u0438 \u0434\u0430\u0432\u043b\u0435\u043d\u0438\u044f<\/td><\/tr><\/tbody><\/table><\/figure>\n\n<p class=\"has-primary-color has-text-color has-link-color wp-elements-2 wp-block-paragraph\">When co\u041c\u041f\u0430ring <strong><a href=\"__PROTECTED_0__\">\u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 specifications<\/a><\/strong>, the hydraulic review should consider \u0442\u0440\u0443\u0431\u0430 size, \u043a\u043b\u0430\u0441\u0441, \u0442\u043e\u043b\u0449\u0438\u043d\u0430 \u0441\u0442\u0435\u043d\u043a\u0438, upset configuration, \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 dimensions, and \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 requirements together.<\/p>\n\n<p class=\"wp-block-paragraph\">Looking at only one dimension can give an incomplete picture.<\/p>\n\n<div data-wp-interactive=\"core\/file\" class=\"wp-block-file\"><object data-wp-bind--hidden=\"!state.hasPdfPreview\" hidden class=\"wp-block-file__embed\" data=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/Drill_Pipe_Hydraulics_Calculation_Reference.pdf\" type=\"application\/pdf\" style=\"width:100%;height:600px\" aria-label=\"\u0412\u0441\u0442\u0430\u0432\u043a\u0430 Drill Pipe Hydraulics Calculation Reference\"><\/object><a id=\"wp-block-file--media-667a4739-800d-4eb9-9b70-483b1cf5bce7\" href=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/Drill_Pipe_Hydraulics_Calculation_Reference.pdf\">\u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u0433\u0438\u0440\u0430\u0432\u043b\u0438\u043a\u0430 Calculation Reference<\/a><a href=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/Drill_Pipe_Hydraulics_Calculation_Reference.pdf\" class=\"wp-block-file__button wp-element-button\" download=\"\" aria-describedby=\"wp-block-file--media-667a4739-800d-4eb9-9b70-483b1cf5bce7\">Download<\/a><\/div>\n\n<h2 class=\"wp-block-heading\">Do Not Confuse \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u043f\u043e\u0442\u0435\u0440\u0438 \u0434\u0430\u0432\u043b\u0435\u043d\u0438\u044f with \u0441\u0432\u0435\u0447\u0430\u0442\u0440\u0443\u0431\u0430 Pressure<\/h2>\n\n<p class=\"wp-block-paragraph\">One common mistake is treating \u0441\u0432\u0435\u0447\u0430\u0442\u0440\u0443\u0431\u0430 pressure and \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u043f\u043e\u0442\u0435\u0440\u0438 \u0434\u0430\u0432\u043b\u0435\u043d\u0438\u044f as the same thing.<\/p>\n\n<p class=\"wp-block-paragraph\">They are related, but they are not identical.<\/p>\n\n<p class=\"wp-block-paragraph\">\u0441\u0432\u0435\u0447\u0430\u0442\u0440\u0443\u0431\u0430 pressure represents the pressure required to circulate \u0431\u0443\u0440\u043e\u0432\u043e\u0439 \u0440\u0430\u0441\u0442\u0432\u043e\u0440 through the complete system.<\/p>\n\n<p class=\"wp-block-paragraph\">The \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 is only one part of that system.<\/p>\n\n<p class=\"wp-block-paragraph\">If \u0441\u0432\u0435\u0447\u0430\u0442\u0440\u0443\u0431\u0430 pressure becomes higher than expected, possible causes can include:<\/p>\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Observation<\/th><th>Possible Cause<\/th><\/tr><\/thead><tbody><tr><td>Pressure gradually increases with higher flow rate<\/td><td>Higher \u0442\u0440\u0435\u043d\u0438\u0435 throughout the \u0446\u0438\u0440\u043a\u0443\u043b\u044f\u0446\u0438\u044f system<\/td><\/tr><tr><td>Pressure increases after \u0431\u0443\u0440\u043e\u0432\u043e\u0439 \u0440\u0430\u0441\u0442\u0432\u043e\u0440 properties change<\/td><td>\u0431\u0443\u0440\u043e\u0432\u043e\u0439 \u0440\u0430\u0441\u0442\u0432\u043e\u0440 has become more resistant to flow<\/td><\/tr><tr><td>Pressure is higher than hydraulic model predicts<\/td><td>Unexpected restriction in \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u043a\u043e\u043b\u043e\u043d\u043d\u0430 or down\u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430 tools<\/td><\/tr><tr><td>Pressure changes after replacing the bit<\/td><td>Different nozzle arrangement<\/td><\/tr><tr><td>Return-flow pressure becomes high<\/td><td>Annular restriction, cuttings loading or fluid properties<\/td><\/tr><tr><td>Sudden abnormal pressure change<\/td><td>Equipment, bit, \u0431\u0443\u0440-\u043a\u043e\u043b\u043e\u043d\u043d\u0430 or \u0446\u0438\u0440\u043a\u0443\u043b\u044f\u0446\u0438\u044f problem<\/td><\/tr><\/tbody><\/table><\/figure>\n\n<p class=\"wp-block-paragraph\">The correct response is to review the complete \u0446\u0438\u0440\u043a\u0443\u043b\u044f\u0446\u0438\u044f path before changing the \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 specification.<\/p>\n\n<h2 class=\"wp-block-heading\">Common Mistakes in \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 Hydraulic Selection<\/h2>\n\n<p class=\"wp-block-paragraph\">One common mistake is to co\u041c\u041f\u0430re \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 only by \u043d\u0430\u0440\u0443\u0436\u043d\u044b\u0439 \u0434\u0438\u0430\u043c\u0435\u0442\u0440. Two \u0442\u0440\u0443\u0431\u0430s with the same OD can have different \u0442\u043e\u043b\u0449\u0438\u043d\u0430 \u0441\u0442\u0435\u043d\u043a\u0438es, \u0442\u0440\u0443\u0431\u0430-body IDs, upset bores, and \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 IDs, so their internal flow areas may be quite different. For hydraulic co\u041c\u041f\u0430rison, the actual bore through the complete \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 assembly matters more than the nominal outside size.<\/p>\n\n<p class=\"wp-block-paragraph\">Another issue is using the \u0442\u0440\u0443\u0431\u0430-body ID as if it represented the entire \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u043a\u043e\u043b\u043e\u043d\u043d\u0430. In practice, the upset or \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 may have a smaller bore. If that restriction appears at every \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435, its effect can build up over a long \u043a\u043e\u043b\u043e\u043d\u043d\u0430 and become more important than the \u0442\u0440\u0443\u0431\u0430-body ID alone would suggest.<\/p>\n\n<p class=\"wp-block-paragraph\">The opposite mistake is to focus only on increasing ID. A larger bore can reduce internal flow resistance, but the \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 still has to carry \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442, tensile load, and repeated make-up and break-out. The best \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 is therefore not simply the one with the largest ID, but the one that provides enough flow area without sacrificing the required mechanical capacity.<\/p>\n\n<p class=\"wp-block-paragraph\">Finally, a high \u0441\u0432\u0435\u0447\u0430\u0442\u0440\u0443\u0431\u0430 pressure should not automatically be blamed on the \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430. Pressure is also lost through surface equipment, the BHA, bit nozzles, and the annulus. <strong>\u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u043f\u043e\u0442\u0435\u0440\u0438 \u0434\u0430\u0432\u043b\u0435\u043d\u0438\u044f<\/strong> should be checked as one part of the full \u0446\u0438\u0440\u043a\u0443\u043b\u044f\u0446\u0438\u044f system rather than treated as a separate problem in isolation.<\/p>\n\n<div class=\"wp-block-buttons is-content-justification-center is-layout-flex wp-container-core-buttons-is-layout-d61d70aa wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/www.drillpipes.com\/ru\/%d0%ba%d0%be%d0%bd%d1%82%d0%b0%d0%ba%d1%82%d1%8b\/\">Free Quotation<\/a><\/div>\n<\/div>\n\n<h2 class=\"wp-block-heading\">FAQ<\/h2>\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>Q: Does a smaller drill pipe ID increase pressure loss?<\/strong><\/summary>\n<p class=\"wp-block-paragraph\"><strong>A:<\/strong> In general, yes. At the same flow rate, a smaller internal diameter reduces flow area and increases fluid velocity. This normally increases friction and therefore increases drill pipe pressure loss<\/p>\n<\/details>\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>Q: Is drill pipe ID the same as tool joint ID?<\/strong><\/summary>\n<p class=\"wp-block-paragraph\"><strong>A:<\/strong> No. Drill pipe ID normally refers to the internal diameter of the pipe body. The tool joint has its own internal bore, which may be smaller and create an additional flow restriction.<\/p>\n<\/details>\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>Q: Can tool joints affect drilling hydraulics?<\/strong><\/summary>\n<p class=\"wp-block-paragraph\"><strong>A:<\/strong> Yes. Each tool joint can create a local restriction because its internal bore and geometry may differ from the pipe body. In a long drill string, the effect of many repeated connections can become significant.<\/p>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>Q: What drill pipe dimensions should be checked for hydraulic performance?<\/strong><\/summary>\n<p class=\"wp-block-paragraph\"><strong>A:<\/strong> Check the pipe-body ID, wall thickness, upset bore, tool joint ID, tool joint OD, connection type, and total drill-string length. These dimensions should then be reviewed together with flow rate and drilling-fluid properties.<\/p>\n<\/details>\n<\/details>\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"410\" src=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/05\/OCTAL-Certifications-1024x410.png\" alt=\"\" class=\"wp-image-12635\" srcset=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/05\/OCTAL-Certifications-1024x410.png 1024w, https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/05\/OCTAL-Certifications-300x120.png 300w, https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/05\/OCTAL-Certifications-2000x800.png 2000w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Drill pipe pressure loss is closely related to the size of the internal flow passage inside the drill string. When the drill pipe ID, or internal diameter, becomes smaller, the same amount of drilling fluid has less space to pass through. Fluid velocity increases, and more pump pressure is required to overcome friction inside the &hellip; <\/p>\n<p class=\"link-more\"><a href=\"https:\/\/www.drillpipes.com\/ru\/how-does-%d0%b1%d1%83%d1%80%d0%b8%d0%bb%d1%8c%d0%bd%d0%b0%d1%8f-%d1%82%d1%80%d1%83%d0%b1%d0%b0-id-affect-%d0%bf%d0%be%d1%82%d0%b5%d1%80%d0%b8-%d0%b4%d0%b0%d0%b2%d0%bb%d0%b5%d0%bd%d0%b8%d1%8f-and\/\" class=\"more-link\">\u0427\u0438\u0442\u0430\u0442\u044c \u0434\u0430\u043b\u0435\u0435<span class=\"screen-reader-text\"> &#171;How Does \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 ID Affect \u043f\u043e\u0442\u0435\u0440\u0438 \u0434\u0430\u0432\u043b\u0435\u043d\u0438\u044f and \u0431\u0443\u0440\u0435\u043d\u0438\u0435 \u0433\u0438\u0440\u0430\u0432\u043b\u0438\u043a\u0430?&#187;<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":15628,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_eb_attr":"","footnotes":""},"categories":[106],"tags":[],"class_list":["post-15624","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-106"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How Does \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 ID Affect \u043f\u043e\u0442\u0435\u0440\u0438 \u0434\u0430\u0432\u043b\u0435\u043d\u0438\u044f and \u0431\u0443\u0440\u0435\u043d\u0438\u0435 \u0433\u0438\u0440\u0430\u0432\u043b\u0438\u043a\u0430?<\/title>\n<meta name=\"description\" content=\"\u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 ID affects flow area, fluid velocity and \u043f\u043e\u0442\u0435\u0440\u0438 \u0434\u0430\u0432\u043b\u0435\u043d\u0438\u044f. Learn how \u0442\u0440\u0443\u0431\u0430-body ID, upset bore and \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 ID influence \u0431\u0443\u0440\u0435\u043d\u0438\u0435 \u0433\u0438\u0440\u0430\u0432\u043b\u0438\u043a\u0430 and \u043d\u0430\u0441\u043e\u0441 pressure.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.drillpipes.com\/ru\/how-does-%d0%b1%d1%83%d1%80%d0%b8%d0%bb%d1%8c%d0%bd%d0%b0%d1%8f-%d1%82%d1%80%d1%83%d0%b1%d0%b0-id-affect-%d0%bf%d0%be%d1%82%d0%b5%d1%80%d0%b8-%d0%b4%d0%b0%d0%b2%d0%bb%d0%b5%d0%bd%d0%b8%d1%8f-and\/\" \/>\n<meta property=\"og:locale\" content=\"ru_RU\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How Does \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 ID Affect \u043f\u043e\u0442\u0435\u0440\u0438 \u0434\u0430\u0432\u043b\u0435\u043d\u0438\u044f and \u0431\u0443\u0440\u0435\u043d\u0438\u0435 \u0433\u0438\u0440\u0430\u0432\u043b\u0438\u043a\u0430?\" \/>\n<meta property=\"og:description\" content=\"\u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 ID affects flow area, fluid velocity and \u043f\u043e\u0442\u0435\u0440\u0438 \u0434\u0430\u0432\u043b\u0435\u043d\u0438\u044f. Learn how \u0442\u0440\u0443\u0431\u0430-body ID, upset bore and \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 ID influence \u0431\u0443\u0440\u0435\u043d\u0438\u0435 \u0433\u0438\u0440\u0430\u0432\u043b\u0438\u043a\u0430 and \u043d\u0430\u0441\u043e\u0441 pressure.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.drillpipes.com\/ru\/how-does-%d0%b1%d1%83%d1%80%d0%b8%d0%bb%d1%8c%d0%bd%d0%b0%d1%8f-%d1%82%d1%80%d1%83%d0%b1%d0%b0-id-affect-%d0%bf%d0%be%d1%82%d0%b5%d1%80%d0%b8-%d0%b4%d0%b0%d0%b2%d0%bb%d0%b5%d0%bd%d0%b8%d1%8f-and\/\" \/>\n<meta property=\"og:site_name\" content=\"Drillpipes\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/kevin.wen.3990\/yoast\" \/>\n<meta property=\"article:published_time\" content=\"2026-08-18T07:32:01+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-09-18T07:58:49+00:00\" \/>\n<meta property=\"og:image\" 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Does \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 ID Affect \u043f\u043e\u0442\u0435\u0440\u0438 \u0434\u0430\u0432\u043b\u0435\u043d\u0438\u044f and \u0431\u0443\u0440\u0435\u043d\u0438\u0435 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