{"id":15580,"date":"2026-08-18T16:23:44","date_gmt":"2026-08-18T08:23:44","guid":{"rendered":"https:\/\/www.drillpipes.com\/%d0%ba%d0%be%d0%bc%d0%bf%d0%bb%d0%b5%d0%ba%d1%82%d1%83%d1%8e%d1%89%d0%b8%d0%b5-%d0%b1%d1%83%d1%80%d0%b8%d0%bb%d1%8c%d0%bd%d0%be%d0%b9-%d0%ba%d0%be%d0%bb%d0%be%d0%bd%d0%bd%d1%8b\/"},"modified":"2026-09-18T15:52:37","modified_gmt":"2026-09-18T07:52:37","slug":"%d0%ba%d0%be%d0%bc%d0%bf%d0%bb%d0%b5%d0%ba%d1%82%d1%83%d1%8e%d1%89%d0%b8%d0%b5-%d0%b1%d1%83%d1%80%d0%b8%d0%bb%d1%8c%d0%bd%d0%be%d0%b9-%d0%ba%d0%be%d0%bb%d0%be%d0%bd%d0%bd%d1%8b","status":"publish","type":"page","link":"https:\/\/www.drillpipes.com\/ru\/%d0%ba%d0%be%d0%bc%d0%bf%d0%bb%d0%b5%d0%ba%d1%82%d1%83%d1%8e%d1%89%d0%b8%d0%b5-%d0%b1%d1%83%d1%80%d0%b8%d0%bb%d1%8c%d0%bd%d0%be%d0%b9-%d0%ba%d0%be%d0%bb%d0%be%d0%bd%d0%bd%d1%8b\/","title":{"rendered":"\u041a\u043e\u043c\u043f\u043b\u0435\u043a\u0442\u0443\u044e\u0449\u0438\u0435 \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u043e\u0439 \u043a\u043e\u043b\u043e\u043d\u043d\u044b"},"content":{"rendered":"\n

\u041a\u043e\u043c\u043f\u043b\u0435\u043a\u0442\u0443\u044e\u0449\u0438\u0435 \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u043e\u0439 \u043a\u043e\u043b\u043e\u043d\u043d\u044b<\/strong> \u2014 \u044d\u0442\u043e \u043a\u043e\u043c\u043f\u043e\u043d\u0435\u043d\u0442\u044b, \u0443\u0441\u0442\u0430\u043d\u0430\u0432\u043b\u0438\u0432\u0430\u0435\u043c\u044b\u0435 \u043c\u0435\u0436\u0434\u0443 \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u044b\u043c\u0438 \u0442\u0440\u0443\u0431\u0430\u043c\u0438 \u0438\u043b\u0438 \u043c\u0435\u0436\u0434\u0443 \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u044b\u043c\u0438 \u0442\u0440\u0443\u0431\u0430\u043c\u0438 \u0438 \u0443\u0442\u044f\u0436\u0435\u043b\u0435\u043d\u043d\u044b\u043c\u0438 \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u044b\u043c\u0438 \u0442\u0440\u0443\u0431\u0430\u043c\u0438 \u0434\u043b\u044f \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u044f, \u0430\u0434\u0430\u043f\u0442\u0430\u0446\u0438\u0438 \u0438 \u0437\u0430\u0449\u0438\u0442\u044b \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u043e\u0439 \u043a\u043e\u043b\u043e\u043d\u043d\u044b.<\/p>\n\n

Common drill pipe accessories and \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u043a\u043e\u043b\u043e\u043d\u043d\u0430 subs include crossover subs, drill pipe pup joints, bit subs, saver subs, lifting subs, pump-in subs, side entry subs and Kelly valves. Each product performs a different function, so selection starts with three basic questions: where the accessory will be installed, what components it must connect, and what function it must perform.<\/p>\n\n

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Drill String Accessories and Their Functions<\/h2>\n\n

Drill pipe, HWDP and drill collars form the main load-carrying sections of the \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u043a\u043e\u043b\u043e\u043d\u043d\u0430, but they cannot cover every connection, spacing, handling and fluid-control requirement encountered during drilling. \u0411\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u043a\u043e\u043b\u043e\u043d\u043d\u0430 accessories<\/strong> are introduced at specific positions to solve these interface requirements without changing the main tubular configuration. Some accessories adapt one connection to another, some provide a shorter section for string-length adjustment, while others protect frequently used threads, support lifting operations or create a controlled drilling-fluid path. Their function is therefore determined mainly by where they are installed and what problem they solve in the \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u043a\u043e\u043b\u043e\u043d\u043d\u0430.<\/p>\n\n

Accessory<\/th>Main Function<\/th>Typical Position<\/th><\/tr><\/thead>
Crossover Sub<\/strong><\/td>Connects two components with different \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435s<\/td>Between \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430, HWDP, drill collar or BHA tools<\/td><\/tr>
Drill Pipe Pup Joint<\/strong><\/td>Adds a short section to adjust \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u043a\u043e\u043b\u043e\u043d\u043d\u0430 length<\/td>Within a \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 or work-string section<\/td><\/tr>
Bit Sub<\/strong><\/td>Connects the lower BHA or drill collar to the drill bit<\/td>Directly above the drill bit<\/td><\/tr>
Saver Sub<\/strong><\/td>Protects a higher-value \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 from repeated wear<\/td>Below the top drive or Kelly<\/td><\/tr>
Lifting Sub \/ Lift Nubbin<\/strong><\/td>Provides a suitable interface for lifting heavy drill stem components<\/td>Drill collars, subs and downhole tools<\/td><\/tr>
Pump-In Sub<\/strong><\/td>Allows drilling fluid to enter the \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u043a\u043e\u043b\u043e\u043d\u043d\u0430 through an additional connection<\/td>Circulation system<\/td><\/tr>
Side Entry Sub<\/strong><\/td>Provides a side connection to the \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u043a\u043e\u043b\u043e\u043d\u043d\u0430 bore<\/td>Fluid circulation or intervention configuration<\/td><\/tr>
Kelly Valve<\/strong><\/td>Opens or closes the \u0431\u0443\u0440\u0435\u043d\u0438\u0435-fluid flow path<\/td>Kelly and upper \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u043a\u043e\u043b\u043e\u043d\u043d\u0430<\/td><\/tr><\/tbody><\/table><\/figure>\n\n

These accessories may have similar short, thick-walled bodies, but their functions and selection criteria are different. A crossover sub<\/strong> is selected according to the two connections that must be joined; a pup joint<\/strong> is selected when the string requires a defined shorter length; a saver sub<\/strong> is installed to absorb repeated make-up and break-out wear; and a Kelly valve<\/strong> is used where drilling-fluid flow must be opened or shut off. For this reason, accessory selection should not be based only on outside diameter or general appearance. The required function, installation position, upper and lower connections, internal bore and compatibility with the surrounding \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u043a\u043e\u043b\u043e\u043d\u043d\u0430 components must be confirmed first.<\/p>\n\n

Types of Drill String Accessories<\/h2>\n\n

\u0411\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u043a\u043e\u043b\u043e\u043d\u043d\u0430 accessories are selected according to the specific problem that must be solved in the string. Connection conversion, string length adjustment, thread protection, bit connection, handling and drilling-fluid control require different components.<\/p>\n\n

Crossover Sub<\/h3>\n\n

A crossover sub<\/strong> joins \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u043a\u043e\u043b\u043e\u043d\u043d\u0430 components that cannot connect directly because their thread sizes, connection types or end configurations are different. It is commonly positioned between drill pipe, HWDP, drill collars and BHA tools, allowing each adjoining component to retain its specified connection while the crossover provides the required transition.<\/p>\n\n

Both ends of the sub must therefore be specified independently. Outside diameter alone cannot determine compatibility; the upper and lower connection designations, pin\/box orientation, internal bore and adjoining components all need to match the actual \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u043a\u043e\u043b\u043e\u043d\u043d\u0430 arrangement.<\/p>\n\n

Configuration<\/th>\u0421\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 Arrangement<\/th>Main Use<\/th><\/tr><\/thead>
Box \u00d7 Pin<\/strong><\/td>Box on one end, pin on the other<\/td>Connects components requiring opposite end configurations<\/td><\/tr>
Box \u00d7 Box<\/strong><\/td>Box \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435s on both ends<\/td>Joins two components presenting pin ends<\/td><\/tr>
Pin \u00d7 Pin<\/strong><\/td>Pin \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435s on both ends<\/td>Joins two components presenting box ends<\/td><\/tr><\/tbody><\/table><\/figure>\n\n

A Box \u00d7 Pin, Box \u00d7 Box or Pin \u00d7 Pin<\/strong> designation defines only the end orientation and does not identify the actual connection family or thread size. Crossover sub selection therefore requires the exact connection designation at both ends, together with the required OD, internal bore and overall length. These dimensions must match the adjoining drill pipe, HWDP, drill collar or BHA component to maintain \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u043a\u043e\u043b\u043e\u043d\u043d\u0430 connection compatibility<\/strong>.<\/p>\n\n

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Drill Pipe Pup Joint<\/h3>\n\n

A drill pipe pup joint<\/strong> provides a shorter drill-string section when a standard drill pipe length does not suit the required spacing or string configuration. It retains the required drill pipe connections while allowing the total string length to be adjusted more precisely.Pup joints are therefore selected as part of the \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u043a\u043e\u043b\u043e\u043d\u043d\u0430 layout rather than simply by nominal pipe size. The required length must be coordinated with the matching drill pipe, connection dimensions and internal bore.<\/p>\n\n

Selection Item<\/th>Requirement<\/th><\/tr><\/thead>
Drill Pipe OD<\/strong><\/td>Match the surrounding \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 size<\/td><\/tr>
\u0421\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 Type<\/strong><\/td>Match the adjoining \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 or drill-string component<\/td><\/tr>
Pin \/ Box Arrangement<\/strong><\/td>Confirm the required end orientation<\/td><\/tr>
Internal Bore<\/strong><\/td>Maintain the required fluid passage<\/td><\/tr>
Overall Length<\/strong><\/td>Meet the planned string spacing<\/td><\/tr>
Construction<\/strong><\/td>Integral or welded, according to the specified product design<\/td><\/tr><\/tbody><\/table><\/figure>\n\n

Pup joint construction may be integral or welded, depending on the required length, connection design and manufacturing route. Integral designs use a continuous forged or machined body, while welded designs combine a pipe body with welded tool-joint ends. The selected construction should remain compatible with the adjoining \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 in connection geometry, bore and mechanical performance.Overall length is specified together with the connection type and bore so that the pup joint fits the planned drill-string spacing without changing the surrounding \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 configuration.<\/p>\n\n

Bit Sub<\/h3>\n\n

Bit sub<\/strong> connects the lower BHA or drill collar to the drill bit, providing the required connection transition immediately above the bit. Its upper connection matches the BHA component, while the lower connection is machined for the specified bit connection. Selection is mainly based on the upper and lower connections, OD, internal bore and overall length<\/strong>, with the bore maintained for the required drilling-fluid passage through the lower BHA.<\/p>\n\n

Saver Sub<\/h3>\n\n

A saver sub<\/strong> is installed between the \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u043a\u043e\u043b\u043e\u043d\u043d\u0430 and a higher-value connection that is exposed to frequent make-up and break-out. By concentrating repeated connection wear on a replaceable component, it helps protect the threads and shoulders of the top drive or Kelly. The two main configurations are Top Drive Saver Subs<\/strong> and Kelly Saver Subs<\/strong>, selected according to the rig-side connection and the \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u043a\u043e\u043b\u043e\u043d\u043d\u0430 connection that must be matched.<\/p>\n\n

Type<\/th>Installed Position<\/th>Main Function<\/th><\/tr><\/thead>
Top Drive Saver Sub<\/strong><\/td>Between the top drive and \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u043a\u043e\u043b\u043e\u043d\u043d\u0430<\/td>Protects the top-drive \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 from repeated \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 wear<\/td><\/tr>
Kelly Saver Sub<\/strong><\/td>Between the Kelly and \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u043a\u043e\u043b\u043e\u043d\u043d\u0430<\/td>Protects the lower Kelly \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 during repeated make-up and break-out<\/td><\/tr><\/tbody><\/table><\/figure>\n\n

Selection is based first on the connection required at the equipment side and the connection presented by the \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u043a\u043e\u043b\u043e\u043d\u043d\u0430, followed by OD, internal bore and overall length<\/strong> to suit the assembly. A saver sub differs from a crossover sub in its primary purpose: the crossover sub adapts incompatible connections, while the saver sub provides a replaceable wear interface for a frequently cycled connection.<\/strong><\/p>\n\n

Pump-In Sub and Side Entry Sub<\/h3>\n\n

Pump-in subs and side entry subs<\/strong> provide an auxiliary fluid connection to the \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u043a\u043e\u043b\u043e\u043d\u043d\u0430 without interrupting the main threaded connection between the components above and below. A pump-in sub introduces drilling fluid into the internal bore through a dedicated inlet, while a side entry sub provides lateral access to the same flow path. Both are used where the drilling or circulation program requires an additional fluid entry point without changing the basic drill-string arrangement.<\/p>\n\n

Selection is based on the required upper and lower drill-string connections, auxiliary port connection, internal bore, overall length and applicable pressure requirement<\/strong>. The auxiliary connection and bore must be sized for the intended drilling-fluid circulation, while the main end connections remain compatible with the surrounding \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u043a\u043e\u043b\u043e\u043d\u043d\u0430. Key specification items include:<\/p>\n\n