Special threaded joint connection structure for titanium alloy oil well pipe
A special thread and joint structure technology, applied in the direction of drill pipe, casing, drilling equipment, etc., can solve the problem that the special thread of API thread is not suitable for titanium alloy material, etc., achieve excellent air sealing ability, reduce contact pressure, and ensure structural integrity sexual effect
Active Publication Date: 2018-07-06
TIANJIN STEEL PIPE MFG CO LTD
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Problems solved by technology
[0006] The purpose of this invention is to provide a special threaded joint connection structure for titanium alloy oil well pipes to solve the problem that API threads and conventional special threads are not suitable for titanium alloy materials
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[0019] The special air-tight threaded joint structure for the bushing of the present invention is described in conjunction with the accompanying drawings.
[0020] Such as figure 1 As shown, the special threaded joint connection structure for titanium alloy oil well pipes of the present invention consists of two parts: a male end A and a female end B. The male end A of the casing consists of a male thread C and contains a male sealing surface F and a male platform. It is composed of the shoulder H part, and the coupling B part is connected between two casings, and the structure of both sides is symmetrical, including the female thread E, the female sealing surface G corresponding to the male sealing surface, and the female shoulder J. The outer diameter of the pipe body is D, the inner diameter of the pipe is d, and the outer diameter of the coupling is W.
[0021] Such as figure 2 As shown, the male sealing surface F is an arc surface, the arc radius is R, the female seali...
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The invention provides a special screwed joint connecting structure for a titanium alloy oil well tube. The male sealing face of the structure is of an arc face type, the female sealing face of the structure is of a taper face type, sealing is achieved through interference fit of the male sealing face and the female sealing face, and the magnitude of interference between the arc face and the taper face is determined by the chord height (shown in the description) of a profile map formed after interference of the arc face and the taper face, so that the problem that API threads and conventional threads are not suitable for titanium alloy materials is solved. The structure has the advantages that the joint connecting structure meets the requirement of international standard API 5B for oil well tubes that thread gluing of oil well tubes does not occur after multiple times of screw-on or screw-off operation; thread gluing of a sleeve does not occur after two times of screw-on or screw-off operation, and thread gluing of an oil tube does not occur after nine times of screw-on or screw-off operation. Due to the fact that titanium alloy is low in surface hardness and poor in wear resistance, risks can be avoided by means of the arc face-taper face sealing mode; according to the arc face-taper face sealing mode, sealing face contact pressure is distributed evenly in a hill shape.
Description
technical field [0001] The invention relates to a special threaded joint connection structure for titanium alloy oil well pipes. Background technique [0002] Oil and gas occupies an extremely important strategic position in the world's energy and even the entire economic field. With the rapid development of the world economy and the increasing demand for energy, the exploration and development of oil and gas are also increasing. As the geological structure becomes more complex and the drilling depth continues to increase, the temperature and pressure of the fluid increase, the sulfur content increases, and the material and technical requirements for oil well pipes are more stringent. Titanium alloy has a series of advantages such as high specific strength, high specific modulus, and corrosion resistance, and its functions and advantages are becoming more and more obvious. High-strength and corrosion-resistant titanium alloys, especially titanium alloy oil well pipes, are i...
Claims
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IPC IPC(8): E21B17/042
CPCE21B17/0426
Inventor 徐志谦孙宇史彬闫龙杨永昌张冰梅丽张军陈涛吕春莉柳玉伟郭强
Owner TIANJIN STEEL PIPE MFG CO LTD