Multistage sealing anti-sticky buckle type thread for titanium alloy oil casing

A kind of oil casing, velcro technology, applied in the direction of casing, drill pipe, drilling equipment, etc., to achieve high sealing reliability, convenient detection, and improve the effect of anti-glue performance

Inactive Publication Date: 2014-01-22
XIAN SANHUAN TECH DEV GENERAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention is mainly to solve the safety development problems of "three high" oil and gas fields such as high temperature, high pressure, and high corrosive medium content, and provides a multi-stage seal anti-sticking thread for titanium alloy oil casing. Reliable performance of hermetic sealing, meanwhile, the variable taper design is adopted on the coupling, which has good anti-sticking performance

Method used

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  • Multistage sealing anti-sticky buckle type thread for titanium alloy oil casing
  • Multistage sealing anti-sticky buckle type thread for titanium alloy oil casing
  • Multistage sealing anti-sticky buckle type thread for titanium alloy oil casing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1: Machining tubing joints with outer diameter Φ88.9mm

[0022] Using the same steel grade coupling and pipe body, the internal thread is copper-plated 10um thick, and the surface of the external thread is shot peened. When buckling, both ends are evenly coated with API thread grease, and the coupling is clamped. The maximum torque is used for the factory end and the best torque is used for the field end.

[0023] Thread size requirements:

[0024]

[0025] The processed tubing joint with an outer diameter of Φ88.9mm has been tested and verified, and there is no sticking phenomenon in 9 times of top-up and shackle. No gas leakage occurs when the axial load is 890KN and the internal pressure load is 80MPa, which meets the requirements of structural integrity and sealing integrity .

Embodiment 2

[0026] Example 2: Processing the outer diameter Φ177.8mm casing joint

[0027] The same steel grade coupling and pipe body are used, the inner thread is 15um thick with copper plating, and the outer thread surface is shot peened. When buckling, both ends are evenly coated with API thread grease, and the coupling is clamped. The maximum torque is used for the factory end and the best torque is used for the field end.

[0028] Thread size requirements:

[0029]

[0030]

[0031] The processed titanium alloy casing joint with an outer diameter of Φ177.8mm has been verified by experiments, and there is no sticking phenomenon after 3 times of topping and shackle. No gas leakage occurs when the axial load is 1100KN and the internal pressure load is 65MPa, which meets the structural integrity and sealing. Integrity requirements.

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Abstract

The invention relates to a multistage sealing anti-sticky buckle type thread for a titanium alloy oil casing. The multistage sealing anti-sticky buckle type thread comprises an oil casing coupling and an oil casing tube end, the oil casing coupling is provided with a standard API buttress internal thread which is sequentially connected with a tool withdrawal groove, a cone surface to cone surface first stage sealing structure, a cylinder surface to cylinder surface second stage sealing structure and a negative angle torque circular bead, wherein the cone surface to cone surface first stage sealing structure and the cylinder surface to cylinder surface second stage sealing structure are in transition through chambering, and the negative angle torque circular bead is connected with the standard API buttress internal thread through a transitional angle. The multistage sealing anti-sticky buckle type thread for the titanium alloy oil casing has the advantages that two stages of metal sealing and one negative angle torque circular bead sealing are added based on the improved buttress thread, the reliability of the air tightness of a thread connector is improved through the design of multistage sealing, meanwhile, the stress state of the thread connector is reduced by changing a thread parameter, the performance of an anti-sticky buckle is improved, and machining and detecting are convenient.

Description

Technical field [0001] The invention relates to a connection thread of a completion production pipe string in the petroleum and natural gas industry, and particularly relates to a multi-stage sealing anti-sticking thread for a titanium alloy tubing and casing used in the presence of high temperature and high pressure corrosive media to ensure safe and effective exploitation of oil and gas wells . Background technique [0002] With the further development of oil and natural gas, many oil and gas fields in western and southwest my country have high temperature (greater than 140℃), high pressure (greater than 100MPa), well depth (greater than 5000m) and contain highly corrosive media (CO 2 , H 2 S, CL-) and other harsh environments, in order to meet the corrosion resistance requirements of oil and gas fields in the development of these oil and gas fields, titanium alloy pipes have been introduced into the production of oil and gas casing and have very excellent performance. [0003] D...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B17/08
Inventor 刘强宋生印冯耀荣李德君白强佘伟军贾鹏军
Owner XIAN SANHUAN TECH DEV GENERAL
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