Pipe thread coupling for petroleum and gas industry
A technology for oil and gas and industry, which is applied in the direction of drill pipe, casing, drilling equipment, etc., can solve the problems of difficulty in ensuring accuracy, difficulty in meeting thread strength, sealing performance, strength, complexity, etc., to achieve easy installation and maintenance, anti-sticking of thread Good buckle performance and high joint strength
Inactive Publication Date: 2016-02-03
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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[0015] 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.
[0016] A pipe thread coupling used in the oil and gas industry, including a pipe body 1, an internal thread 2 and a middle wall ring 3, the main body of the coupling is a cylindrical pipe body 1, and the insides of both axial ends of the pipe body are the same The shaft is equipped with 2-7 / 8″ internal thread 2, the internal thread adopts 25.4mm trapezoidal thread with 8 teeth or 6 teeth, and the thread buckle has high strength; the thread surface is roughened by sandblasting or phosphating to avoid thread sticking .
[0017] The middle part of the pipe body is formed with a middle wall ring 3 which is flush with the inner diameter of the pipe, and the middle wall ring 3 ensures that the inner diamet...
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The invention relates to a pipe thread coupling for the petroleum and gas industry. The pipe thread coupling comprises a pipe body, internal threads and a medial wall ring, wherein the body of the coupling is the cylindrical pipe body, the 2-7 / 8 inch internal threads are coaxially arranged inside the two axial ends of the pipe body respectively, the medial wall ring flush with the inner circle of the pipe body is arranged on the middle section of the interior of the pipe body, and an inward cambered annular taper angle is arranged at the position where each internal thread is connected with the medial wall ring. High-precision coupling connection is adopted, and connector strength is high; the trapezoid threads are adopted, thread connection strength is high, and duplex metal interference fit sealing performance is high; furthermore, the surfaces of the threads are subjected to abrasive blasting and parkerizing, the anti-galling property of the threads is high, and installation and maintenance are facilitated.
Description
technical field [0001] The invention belongs to oil pipe connectors, in particular to a pipe thread coupling used in 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 th...
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IPC IPC(8): E21B17/02
Inventor 卢斌
Owner TIANJIN JINGGONG PETROLEUM PIPE FITTINGS