Pipe-thread joint assembly for petroleum/natural gas industry
A technology used in oil and gas and industry, applied in the direction of drill pipe, casing, drilling equipment, etc., can solve the problems of difficult to guarantee accuracy, difficult to meet thread strength, sealing performance, strength, complexity, etc., to achieve easy installation and maintenance, thread anti-sticking Good buckle performance and high joint strength
Inactive Publication Date: 2016-01-20
TIANJIN JINGGONG PETROLEUM PIPE FITTINGS
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Problems solved by technology
At present, the oil pipes commonly used at home and abroad are generally produced using the "API" technical standard, but in actual production, the actual production process requires more and more complicated oil pipe structures, and different diameters need to be installed at different operating positions. Therefore, it is necessary to connect different types of oil pipes. Sometimes multiple adapters are needed to meet the requirements of the connection process and the production process. The existing BC buckle type of API5CT5B standard has been difficult to meet the thread strength and sealing performance. Process requirements, precision is difficult to guarantee
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[0013] The present invention will be further described in detail below in conjunction with the accompanying drawings and through specific embodiments. The following embodiments are only descriptive, not restrictive, and cannot limit the protection scope of the present invention.
[0014] A pipe thread joint assembly for the oil and gas industry, including a coupling 1 and a coupling 2. The main body of the coupling is a cylindrical structure, and a 4-1 / 2" inner hole is symmetrically formed in both axial ends of the coupling. thread, a middle wall ring 3 is formed in the middle of the inner wall of the coupling between the internal threads at the two ends;
[0015] The internal threads at both axial ends of the coupling are respectively coaxially engaged with a joint, and the outer circumference of the connecting end of the joint is made with a 4-1 / 2" external thread matching the coupling, and the other end of the joint is used to seal the oil pipe;
[0016] The internal / extern...
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The invention relates to a pipe-thread joint assembly for the petroleum / natural gas industry. The pipe-thread joint assembly comprises a coupling and two joints, wherein the main body of the coupling is of a cylindrical structure; inner threads are symmetrically formed in the two axial ends of the coupling; a middle wall ring is formed in the middle on the inner wall of the coupling between the inner threads at the two axial ends; the joints are coaxially meshed and mounted with the inner threads at the two axial ends of the coupling respectively; outer threads matched with the coupling are formed on the peripheries at the connecting ends of the joints; middle wall slopes which slope inwards are formed at the axial end parts of a pipe body with outer threads, and fit the axial end surface corresponding to the coupling of the middle wall ring. The pipe-thread joint assembly has the advantages that the high-precision coupling is adopted for connection, and the joints are high in strength; the trapezoid threads are adopted, so that the strength of the thread joints are high, and the sealing performance of bi-metal interference fit is good; meanwhile, the surfaces of the threads are subjected to sand blasting and phosphorization, so that the threads are good in anti-galling performance, and the mounting and the maintenance are facilitated.
Description
technical field [0001] The invention belongs to oil pipe connectors, in particular to a pipe thread joint assembly for the oil and gas industry. Background technique [0002] With the change of the oil field production environment, various complex well conditions such as deep wells and high-pressure oil and gas wells put forward better requirements for the connection strength and sealing performance of the tubing. At present, the oil pipes commonly used at home and abroad are generally produced using the "API" technical standard, but in actual production, the actual production process requires more and more complicated oil pipe structures, and different diameters need to be installed at different operating positions. Therefore, it is necessary to connect different types of oil pipes. Sometimes multiple adapters are needed to meet the requirements of the connection process and the production process. The existing BC buckle type of API5CT5B standard has been difficult to meet ...
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IPC IPC(8): E21B17/02
Inventor 卢斌
Owner TIANJIN JINGGONG PETROLEUM PIPE FITTINGS