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Dual-stage sealed threaded joint

A threaded joint and external sealing technology, which is applied in the direction of drilling equipment, earthwork drilling, drill pipe, etc., can solve the problems that cannot meet the requirements of 100% pipe gas sealing performance, and achieve the effect of ensuring the annular space

Inactive Publication Date: 2017-12-22
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For this type of joint form, the original sealing structure cannot meet the performance requirements of 100% pipe airtightness

Method used

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  • Dual-stage sealed threaded joint
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  • Dual-stage sealed threaded joint

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] Selection specifications: The outer diameter of the oil well pipe is φ88.9mm, the wall thickness is 9.52mm, and the parameters of the threaded joint (the outer diameter and wall thickness data of the male and female joints are the same) are as follows:

[0068] The inner diameter is 69.86mm, the thread pitch is 4.233mm, the thread taper is 1:16, and the first outer and inner sealing surface angle is 9°(θ 11 , θ 21 ), the first outer and inner torque shoulder angle face angle is 90°(θ 12 , θ 22 ), the angle of the second outer and inner sealing surfaces is 30°(θ 13 , θ 23 ), the angle of the second outer and inner torque shoulders is 75°(θ 14 , θ 24 ).

[0069] Implementation effect: the tensile efficiency of the joint reaches 58% of the pipe body; the compression efficiency is equivalent to 30% of the pipe body; under the condition of gas medium, the internal pressure value of the joint seal exceeds 100% of the API pipe internal pressure yield strength; for the jo...

Embodiment 2

[0071] Selection specifications: the outer diameter is φ177.8mm, the wall thickness is 10.36mm, and the parameters of the threaded joint (the outer diameter and wall thickness data of the male and female joints are the same) are as follows:

[0072] The parameters of the joint are as follows: the inner diameter is 157.08mm, the pitch is 5.08mm, the thread taper is 1:16, and the angle of the first outer and inner sealing surfaces is 9°(θ 11 , θ 21 ), the angle of the first outer and inner torque shoulders is 90°(θ 12 , θ 22 ), the angle of the second outer and inner sealing surfaces is 21°(θ 13 , θ 23 ), the second outer and inner torque shoulder surface 75°(θ 14 , θ 24 ).

[0073] Implementation effect: the tensile efficiency of the joint reaches 53% of the pipe body; the compression efficiency is equivalent to 30% of the pipe body; under the condition of gas medium, the internal pressure value of the joint seal exceeds 100% of the API pipe internal pressure yield streng...

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Abstract

The present invention is a two-stage sealed threaded joint, which solves the problems of tightness and annular space of oil well pipe joints. It consists of a male joint and a female joint; the male joint is a joint with an external thread structure at one end of an oil well pipe From the inner end to the outer end, there are first external torque shoulder, first external sealing surface, external thread, second external sealing surface, and second external torque shoulder; the female joint is another oil well pipe with internal thread at one end The joints of the structure, from the outer end to the inner end, are the first internal torque shoulder, the first internal sealing surface, the internal thread, the second internal sealing surface, and the second internal torque shoulder; the external thread of the male joint and the internal thread of the female joint The threads are screwed together and tightened to form a threaded joint that forms a double-shouldered, double-stage seal. This joint is suitable for threaded joint casings of direct connection type and small coupling joint products, which can reduce the protrusion of the outer shoulder of the joint and ensure the annular space; this joint is a threaded joint with double shoulders and two stages of sealing, with high sealing capacity and resistance to overtorque.

Description

technical field [0001] The invention relates to a threaded joint, in particular to a two-stage sealed threaded joint, which is a double-sealed double-shouldered threaded joint used for oil and gas development. Background technique [0002] Oil well pipes are oil-specific pipes necessary for oil and natural gas exploitation. Through threaded connections, oil well pipe strings with sufficient well depth are formed to realize the exploitation of oil and gas resources. During the production process, the oil well pipe string has to bear loads such as tension, compression, internal pressure, external pressure, bending, temperature, etc., and the force is harsh, and the quality requirements of the entire oil well pipe are high. However, in the prior art, the threaded connection of the oil well pipe The threaded joint at the top is the weakest link. [0003] Existing oil well pipe threaded joints can be roughly divided into two categories, one is standard API series joints, and the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B17/042E21B17/08
CPCE21B17/042E21B17/08
Inventor 孙建安王琍蔡蕴斌左宏志
Owner BAOSHAN IRON & STEEL CO LTD
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