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Drill rod joint with thread profiles

A technology of drill pipe joints and external thread joints, which is applied in the direction of drill pipes, drill pipes, drilling equipment, etc., to achieve the effects of improving drilling work efficiency, reducing make-up and breakout time, and improving hydraulic characteristics

Inactive Publication Date: 2014-09-03
上海海隆石油钻具有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with the triangular thread, the trapezoidal thread has the characteristics of large torque transmission and strong torsion resistance. The oil casing generally adopts the partial trapezoidal thread, but currently there is no trapezoidal and variable trapezoidal thread for the oil drill pipe thread

Method used

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  • Drill rod joint with thread profiles

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Embodiment Construction

[0014] Such as figure 1 , the invention discloses a drill pipe joint of thread profile, which comprises an externally threaded joint 1 and an internally threaded joint 2, the externally threaded joint 1 and the internally threaded joint 2 have threads with the same taper along the axial direction, and the externally threaded joint 1 Both the thread profile 11 and the thread profile 21 of the internal thread joint 2 are deformed trapezoids, the first flank angle 12 of the thread profile 11 of the external thread joint 1 is 30°-75°, and the second flank angle 13 is 0° ~-30°, thread taper 1:6~1:32, pitch ≥ 6.35mm, first flank angle 22 of internal thread joint 2 thread profile 21 is 30°~75°, second flank angle 23 is 0°~-30°, thread taper 1:6~1:32, pitch ≥6.35mm. The first flank angle 12 of the thread profile 11 of the external thread joint 1 is equal to the first flank angle 22 of the thread profile 21 of the internal thread joint 2, and the second flank angle 13 of the thread pr...

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Abstract

The invention relates to a drill rod joint used in an oil and gas drilling and extraction processes, in particular to a drill rod joint with thread profiles. The drill rod joint comprises an external thread joint and an internal thread joint. The external thread joint and the internal thread joint are provided with threads of the same taper in the axial direction. The drill rod joint is characterized in that thread profiles of the external thread joint and thread profiles of the internal thread joint are both deformed trapezoids; in each thread profile of the external thread joint, a first flank angle ranges from 30 degrees to 75 degrees, a second flank angle ranges from 0 degree to minus 30 degrees, the thread taper is 1:6 to 1:32, and the thread pitch is larger than or equal to 6.35 mm; in each thread profile of the internal thread joint, a first flank angle ranges from 30 degrees to 75 degrees, a second flank angle ranges from 0 degree to minus 30 degrees, the thread taper is 1:6 to 1:32, and the thread pitch is larger than or equal to 6.35 mm. The torsional property, abrasive resistance and anti-fatigue performance of the drill rod joint can be improved, and the drill rod joint can be rapidly screwed on.

Description

technical field [0001] The invention relates to a drill pipe joint used in oil and gas drilling, in particular to a drill pipe joint of thread profile. Background technique [0002] In the process of oil and gas drilling and production, the drill pipe has to bear the combined stress of tension, compression, bending, internal pressure, external pressure and thermal cycle for a long time in different well sections. The threaded connection part of the drill pipe is the weakest link. Due to the harsh working environment of the drill pipe joint and the complex stress situation, problems such as root fracture, corrosion, and thread puncture leakage are very prone to occur. [0003] Most of the currently used drill pipe joints are API standard drill pipe joints. The thread taper of the common API drill pipe joint thread is 1:6, the thread is triangular round thread, and the pitch is 6.35mm. Ordinary API tool joint threads have fundamental stress concentration, severe notch effect,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B17/042
Inventor 余荣华袁鹏斌鲁喜宁陈彪
Owner 上海海隆石油钻具有限公司
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