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High-torque and high-fatigue-resistance threaded joint

A threaded joint and high-torque technology, applied in drilling equipment, earthwork drilling, drill pipe, etc., can solve the problems of internal thread expansion of threaded joints, low torsional strength of threaded joints, thread fracture of external threaded joints, etc., to achieve increased Firmness, reduction of damage probability and duration, effects of stress level reduction

Pending Publication Date: 2018-06-15
SHANGHAI HILONG DRILL PIPE MATERIALS INST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When these threaded joints of API are matched with high-grade steel drill pipes and used in super-long horizontal wells, internal thread expansion or and Failure Accident of Thread Fracture of Externally Threaded Joint

Method used

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  • High-torque and high-fatigue-resistance threaded joint

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Embodiment Construction

[0012] The present invention will be further described below in conjunction with the accompanying drawings.

[0013] see figure 1 , the invention discloses a threaded joint with high torque and high fatigue resistance, comprising an external threaded joint with an external shoulder of an external thread, an external thread section and an external end surface of an external thread, and an internal end surface with an internal thread, an internal thread section and an internal thread The internal thread joint of the external shoulder; it is characterized in that: the external thread section and the internal thread section form a contact surface between the two after they are completely screwed, and the contact surface forms an incomplete thread engagement section at the front section and a complete thread engagement section at the middle section The incomplete thread meshing segment of the segment and the rear segment, the thread teeth in the area of ​​the three segments have di...

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Abstract

The invention discloses a high-torque and high-fatigue-resistance threaded joint. The high-torque and high-fatigue-resistance threaded joint comprises an outer threaded joint body which is provided with an outer threaded outer circular bead, an outer threaded section and an outer threaded outer end face and an inner threaded joint body which is provided with an inner threaded inner end face, an inner threaded section and an inner threaded outer circular bead. The high-torque and high-fatigue-resistance threaded joint is characterized in that after the outer threaded section and the inner threaded section are totally screwed together, a contact face is formed between the outer threaded section and the inner threaded section, a front-section incomplete thread meshing section, a middle-section complete thread meshing section and a rear-section incomplete thread meshing section are formed on the contact face, thread teeth in the three sectional areas have different heights, and different tapers are adopted by the outer threaded section and the inner threaded section. The technical problems that the threaded joint is easily fatigued and lossy on the condition that the drilling conditionis increasingly demanding and the horizontal lengths of a horizontal well and a horizontal extra-deep well are on the increase are solved, so that the torque capacity of the thread of the joint is increased, and the fatigue performance of the thread of the joint is increased thereupon.

Description

technical field [0001] The invention relates to a threaded joint used in the drilling and production of oil wells or gas wells, especially a threaded joint with high torque and high fatigue resistance. Background technique [0002] The threaded joints used in the drilling and production of oil or gas wells are generally manufactured according to the API standard formulated by the American Petroleum Institute (also known as API). As the drilling conditions become more and more harsh, the horizontal length of horizontal wells and horizontal ultra-deep wells continues to increase, the steel grade of the drill pipe is required to be continuously improved, the torque capacity of the joint thread is also increasing, and the fatigue performance of the joint thread is also required. can be improved accordingly. When these threaded joints of API are matched with high-grade steel drill pipes and used in super-long horizontal wells, internal thread expansion or and Failure accident o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B17/042
CPCE21B17/042
Inventor 鲁喜宁欧阳志英罗睿余世杰
Owner SHANGHAI HILONG DRILL PIPE MATERIALS INST
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