Anti-sticking high-sealability high-load oil well pipe and drilling tool thread

Abstract

The invention relates to the technical field of machinery, in particular to an anti-sticking high-sealability high-load oil well pipe and a drilling tool thread. In the invention, high-load ultrahigh-sealability threaded connection is realized after a sealing technology of an arc surface is overlaid by utilizing a turning and milling combined machining center, a formed thread milling cutter, a varying pitch numerical-control processing program, laser surface hardening program, a temperature control phase change sealing ring and a hardened conical surface. The invention has high production efficiency and sealing accuracy.

Description

technical field [0001] The invention relates to the technical field of machinery, in particular to an anti-adhesion high-seal high-load oil well pipe and a drilling tool thread. Background technique [0002] At present, the commonly used threaded connection sealing method in the oil pipe industry is mainly to process spherical and conical surfaces at the thread meshing parts, and use the deformation of the material to achieve the sealing effect. Or process multiple steps to achieve the sealing effect. [0003] However, these methods have many disadvantages: [0004] 1) Due to the existence of tolerances during machining, there is a lot of stress on both sides of the thread engagement when they are fully engaged and the sealing effect is achieved. [0005] 2) The sealing surface of all traditional designs is only between 1-3, and it is easy to be corroded by corrosive media and damage the seal. [0006] 3) All traditionally designed seals cannot effectively solve the tensi...

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Problems solved by technology

[0005] 2) The sealing surface of all traditional designs is only between 1-3, and it is easy to be corroded by corrosive media and damage the seal

[0006] 3) All traditionally designed seals cannot effectively solve the tensile deformation of the threaded part of the steel pipe under the action of its own weight

[0007] 4) When processing all domestic threads, the back groove must be designed, resulting in the reduction of effective threads within the specified length

[0008] 5) All thread designs can only rely on the control of "tightening torque" to determine whether the thread connection is in place, and cannot fix the specific position of thread engagement

[0009] 6) All traditionally designed threaded connections cannot prevent the occurrence of adhesion between the two sides of the threaded mesh

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