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Double tooth airtight thread

A gas-sealed and tooth-shaped technology, which is applied to drilling equipment, earthwork drilling, drill pipes, etc., can solve the problems of easily damaged oil and gas seals, failures, etc. buckle effect

Active Publication Date: 2016-06-15
山西环界石油钻具制造股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to solve the technical problems that the conventional drilling tool screw connection part is easily damaged and the oil-gas seal fails under special formation conditions, the present invention provides a double-tooth type air-tight screw thread suitable for drilling tool connection

Method used

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Embodiment Construction

[0020] like figure 1 The shown drill tool has a male joint and a female joint at both ends; the male joint and the female joint are double-tooth air-tight threads, such as figure 2 , image 3 As shown, the thread of the male joint and the female joint is a tapered triangular thread, the tooth angle is 60°, and the internal and external threads have three sealing surfaces respectively: the shoulder surface, the end surface has a 15° angle cone surface seal, the tooth The sealing groove R formed by the convex arc sealing surface and the concave arc sealing surface on the side surface 0 -0.02 and R +0.02 0 , The tooth height of the thread is 3.095mm, the tooth top width is 1.66mm, the pitch is 4 teeth / inch, the taper is 1:6, and the sealing groove R=0.5mm.

[0021] like Figure 4 As shown, under the pretightening force of 9000N.m~12000N.m, the thread pair is tightly screwed. At this time, the gap between the major diameter of the external thread and the major diameter of ...

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Abstract

The invention relates to a connecting sealing structure for a petroleum drilling tool, in particular to a dual-tooth-form gas-tight thread. The dual-tooth-form gas-tight thread is characterized in that an inner thread is provided with a concave-arc sealing surface; an outer thread is provided with a convex-arc sealing surface; the convex sealing surface is an elliptic arc, parabolic arc or spline-shaped convex-arc sealing surface; the convex-arc sealing surface of the outer thread is meshed with the concave-arc sealing surface of the inner thread. The connecting sealing structure has the advantages that 1, a joint is high in connecting strength, can be matched with a tube body at equal strength, is even higher than the tube body at certain times, and is suitable for deep wells and super deep wells; 2, the bending resistance grade is 3+, so that the connecting sealing structure is suitable for deviated wells, large-displacement wells and horizontal wells; 3, buckling can be performed easily and rapidly without causing any error, so that the connecting sealing structure is suitable for drilling operation in severe environments of deserts, sea and the like; 4, the anti-sticking performance is high, and buckling and detachment can be performed without damaging the threads; 5, the excessive torque resistance is high.

Description

technical field [0001] The invention relates to an oil drilling tool connection sealing structure, in particular to a double-tooth type air-tight screw thread. Background technique [0002] With the sharp increase in the world's demand for fossil energy and the decrease in the amount of oil that can be recovered year by year, the current oil exploration field is gradually developing in the direction of deep wells, ultra-deep wells, high-pressure oil and gas wells, heavy oil thermal recovery wells, and directional wells. As a result, more and more stringent technical requirements are put forward for the sealing between oil pipelines and pipes. In the past, API (American Petroleum Institute) standard digital coarse thread joints, which were widely used in the past, could not meet the needs of oil and gas wells with harsh environmental conditions in terms of air tightness, connection strength and corrosion resistance. It forces people to research and develop more reliable thre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B17/042
Inventor 宫晋文魏晓波成三琴张永红扎哈罗夫·谢尔盖·尤里耶维奇
Owner 山西环界石油钻具制造股份有限公司
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