{"id":15911,"date":"2026-06-04T14:57:31","date_gmt":"2026-06-04T06:57:31","guid":{"rendered":"https:\/\/www.drillpipes.com\/%d8%ae%d9%8a%d8%b7-%d8%ae%d8%a7%d8%b5-%d8%a3%d9%86%d8%a8%d9%88%d8%a8-%d8%a7%d9%84%d8%ad%d9%81%d8%b1-%d8%a7%d9%84%d9%85%d9%8a%d8%b2%d8%a9s\/"},"modified":"2026-09-18T16:11:33","modified_gmt":"2026-09-18T08:11:33","slug":"%d8%ae%d9%8a%d8%b7-%d8%ae%d8%a7%d8%b5-%d8%a3%d9%86%d8%a8%d9%88%d8%a8-%d8%a7%d9%84%d8%ad%d9%81%d8%b1-%d8%a7%d9%84%d9%85%d9%8a%d8%b2%d8%a9s","status":"publish","type":"post","link":"https:\/\/www.drillpipes.com\/ar\/%d8%ae%d9%8a%d8%b7-%d8%ae%d8%a7%d8%b5-%d8%a3%d9%86%d8%a8%d9%88%d8%a8-%d8%a7%d9%84%d8%ad%d9%81%d8%b1-%d8%a7%d9%84%d9%85%d9%8a%d8%b2%d8%a9s\/","title":{"rendered":"\u062e\u064a\u0637 \u062e\u0627\u0635 \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 \u0627\u0644\u0645\u064a\u0632\u0629s"},"content":{"rendered":"\n

Special threaded drill pipe<\/strong> is selected when a normal drill pipe connection may not provide enough torque reserve<\/strong>, make-up stability<\/strong>, hydraulic performance<\/strong>, or fatigue control<\/strong> for demanding drilling programs. In deep wells, high-deviation wells, extended-reach drilling, HDD crossings, and long horizontal sections, the weak point is often not the pipe body alone. The connection area\u2014thread form<\/strong>, shoulder contact<\/strong>, tool joint geometry<\/strong>, make-up torque<\/strong>, and repeated breakout performance\u2014decides whether the drill string can work safely under combined torque, tension, bending, and mud circulation load.<\/p>\n\n

A \u062e\u064a\u0637 \u062e\u0627\u0635 \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631<\/strong> is not simply a \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 with a dIFferent \u0627\u0644\u062e\u064a\u0637. It is a \u0627\u0644\u0648\u0635\u0644\u0629 system designed to improve how load is transferred<\/strong> \u0628\u064a\u0646 the \u0627\u0644\u062f\u0628\u0648\u0633 and \u0627\u0644\u0635\u0646\u062f\u0648\u0642, how the shoulder faces carry \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646<\/strong>, how the \u0627\u0644\u0648\u0635\u0644\u0629 resists \u0627\u0644\u062a\u0622\u0643\u0644<\/strong>, and how the string maintains \u0627\u0644\u062d\u0641\u0631-fluid flow<\/strong> under high-load operation. In actual \u0627\u0644\u062d\u0641\u0631 programs, the key is whether the \u0627\u0644\u0648\u0635\u0644\u0629 can hold make-up stability<\/strong>, \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 transfer<\/strong>, and shoulder contact<\/strong> after repeated running, rotation, and breakout.<\/p>\n\n

What Makes \u062e\u064a\u0637 \u062e\u0627\u0635 \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 DIFferent<\/h2>\n\n

Standard \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 is normally selected by \u0627\u0644\u062f\u0631\u062c\u0629, size, \u0633\u0645\u0627\u0643\u0629 \u0627\u0644\u062c\u062f\u0627\u0631, \u0627\u0644\u0648\u0635\u0644\u0629, upset type, and \u0627\u0644\u0648\u0635\u0644\u0629. API 5DP provides the technical delivery basis for \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 with upset \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628-body ends and welded-on \u0627\u0644\u0648\u0635\u0644\u0629s, while rotary shouldered \u0627\u0644\u0648\u0635\u0644\u0629s are further associated with \u0627\u0644\u062e\u064a\u0637ing, gauging, and \u0627\u0644\u0648\u0635\u0644\u0629 control requirements. The \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 body still matters, but the \u062e\u064a\u0637 \u062e\u0627\u0635 type adds another decision layer: the \u0627\u0644\u0648\u0635\u0644\u0629 must support the \u0627\u0644\u062d\u0641\u0631 program.<\/p>\n\n

Special threaded drill pipe<\/a><\/strong> usually focuses on one or more of the following connection improvements:<\/p>\n\n

Design Area<\/th>What It Controls<\/th>Why It Matters in \u0627\u0644\u062d\u0641\u0631<\/th><\/tr><\/thead>
\u0627\u0644\u062e\u064a\u0637 profile<\/td>Load transfer \u0628\u064a\u0646 \u0627\u0644\u062f\u0628\u0648\u0633 and \u0627\u0644\u0635\u0646\u062f\u0648\u0642<\/td>Reduces stress coNCentration and improves \u0627\u0644\u0648\u0635\u0644\u0629 engagement<\/td><\/tr>
Shoulder design<\/td>\u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 transfer and \u0627\u0644\u062e\u062a\u0645ing contact<\/td>Supports more stable make-up and higher \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 capacity<\/td><\/tr>
\u0627\u0644\u0648\u0635\u0644\u0629 OD \/ ID<\/td>Strength, \u0627\u0644\u062a\u0622\u0643\u0644 resistaNCe, and flow passage<\/td>Affects torsion, handling \u0627\u0644\u062a\u0622\u0643\u0644, and hydraulic \u0627\u0644\u0623\u062f\u0627\u0621<\/td><\/tr>
Make-up \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 range<\/td>Correct \u0627\u0644\u0648\u0635\u0644\u0629 preload<\/td>Reduces under-\u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646, over-\u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646, galling, and \u0627\u0644\u0648\u0635\u0644\u0629 damage<\/td><\/tr>
Gauge inspection<\/td>\u0627\u0644\u062e\u064a\u0637 and shoulder acceptaNCe<\/td>Helps verIFy \u0627\u0644\u0648\u0635\u0644\u0629 fit before shipment or rig use<\/td><\/tr>
Surface protection<\/td>\u0627\u0644\u062e\u064a\u0637 and shoulder protection during handling<\/td>Reduces transit damage and rig-site rejection risk<\/td><\/tr><\/tbody><\/table><\/figure>\n\n

The real \u0627\u0644\u0645\u064a\u0632\u0629 is the \u0627\u0644\u0648\u0635\u0644\u0629\u2019s ability to stay stable under field load. A \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 can have a strong \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 body, but IF the \u0627\u0644\u0648\u0635\u0644\u0629 is not suitable for the \u0627\u0644\u062d\u0641\u0631 \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646, dogleg severity, lateral length, or make-up practice, the string may still face \u0627\u0644\u0648\u0635\u0644\u0629 \u0627\u0644\u062a\u0639\u0628, shoulder damage, or premature \u0627\u0644\u062e\u064a\u0637 repair.<\/p>\n\n

\"\"<\/figure>\n\n

Higher Torsional Capacity<\/h2>\n\n

The most important \u0627\u0644\u0645\u064a\u0632\u0629 of \u062e\u064a\u0637 \u062e\u0627\u0635 \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631<\/strong> is higher torsional capacity. In high-\u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 \u0627\u0644\u062d\u0641\u0631, the \u0627\u0644\u0648\u0635\u0644\u0629 must transmit rotary \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 without damaging the \u0627\u0644\u062e\u064a\u0637, overloading the shoulder, or losing make-up stability. This is especially important when \u0627\u0644\u062d\u0641\u0631 hard formations, long horizontal sections, or extended-reach \u0627\u0644\u0628\u0626\u0631s where \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 accumulates along the \u0633\u0627\u0642 \u0627\u0644\u062d\u0641\u0631.<\/p>\n\n

A common design route is the \u0645\u0632\u062f\u0648\u062c shoulder \u0627\u0644\u0648\u0635\u0644\u0629<\/strong>. CoMPared with a \u0645\u0641\u0631\u062f-shoulder \u0627\u0644\u0648\u0635\u0644\u0629, a \u0645\u0632\u062f\u0648\u062c-shoulder design adds an internal shoulder contact area, allowing \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 to be distributed through more contact surfaces. Industry technical refereNCes commonly describe \u0645\u0632\u062f\u0648\u062c-shoulder \u0627\u0644\u0648\u0635\u0644\u0629s as a way to improve torsional \u0627\u0644\u0623\u062f\u0627\u0621 and hydraulic efficieNCy when coMPared with standard API-style \u0627\u0644\u0648\u0635\u0644\u0629s, depending on size and design.<\/p>\n\n

When \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 rises during sliding, rotating, reaming or pulling through a high-\u0627\u0644\u0627\u062d\u062a\u0643\u0627\u0643 section, a higher-\u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 \u0627\u0644\u0648\u0635\u0644\u0629 helps keep shoulder contact more stable and reduces the risk of \u0627\u0644\u062e\u064a\u0637 movement, jump-out or \u0627\u0644\u0648\u0635\u0644\u0629 damage. The \u0627\u0644\u0648\u0635\u0644\u0629 should be reviewed together with expected surface \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646, downhole \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 demand and \u0627\u0644\u062d\u0641\u0631 program requirements, not only by \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 OD and \u0627\u0644\u062f\u0631\u062c\u0629.<\/p>\n\n

\"\"<\/figure>\n\n

Better Make-Up Stability<\/h2>\n\n

\u062e\u064a\u0637 \u062e\u0627\u0635 \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 also improves make-up stability when the \u0627\u0644\u0648\u0635\u0644\u0629 is designed with better shoulder contact and \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 transfer. Make-up is not only the act of tightening the joint. It is the process of creating the correct preload \u0628\u064a\u0646 the \u0627\u0644\u062f\u0628\u0648\u0633 and \u0627\u0644\u0635\u0646\u062f\u0648\u0642 so that the \u0627\u0644\u0648\u0635\u0644\u0629 can carry \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646, tension, bending, and vibration without \u0627\u0644\u062e\u064a\u0637 movement or shoulder damage.<\/p>\n\n

In real rig operation, unstable make-up can create several problems:<\/p>\n\n