Marine drill pipe connector

Abstract

The invention discloses a marine drill pipe joint, which comprises a male joint and a female joint. The male joint and the female joint have external threads and internal threads that match each other. One end of the threaded end is provided with a tapered shoulder, and a plurality of reinforcing ribs of spiral structure are arranged at intervals on the tapered shoulder, and spiral grooves are formed between adjacent reinforcing ribs. The marine drill pipe joint of the present invention is provided with a number of helical ribs and spiral grooves at intervals on the tapered shoulder, so that the marine drill pipe joint has high torsional strength, large load capacity, and uniform stress distribution, which meets the requirements of marine drill pipe drilling. High torsional requirements for ultra-deep wells. In addition, the ribs and spiral grooves also have the advantages of accelerating the circulation of drilling fluid and improving the ability to resist erosion and wear, which can prevent premature wear and failure of offshore drill pipes, thereby prolonging the life of drill pipes, improving drilling efficiency, shortening drilling cycles, and reducing drilling costs.

Description

technical field [0001] The invention relates to the technical field of offshore oil and gas exploration equipment, in particular to an offshore drill pipe joint. Background technique [0002] Drill pipe is an important tool for drilling work, and it is an important part of the drill string. During the drilling process, the drill pipe plays an important role, such as transporting drilling fluid to the bottom of the well, transmitting torque to the drill bit, tripping the drill bit, dealing with downhole accidents, testing, etc. [0003] In the process of offshore drilling, different drilling fluids form different dispersion systems and play different roles. From a physical and chemical point of view, drilling fluid is a multiphase unstable system. In order to meet the requirements of the drilling process and improve the performance of the drilling fluid, various additives are often added to the drilling fluid. During the circulation process, the drilling fluid cannot alway...

AI Technical Summary

Problems solved by technology

Therefore, it is easy to deposit debris, increase the pressure of the offshore drill pipe, accelerate the wear of the offshore drill pipe, and cause the breakage of the offshore drill pipe in severe cases, resulting in drilling accidents, reduced drilling efficiency, and increased drilling costs.

[0007] The solid phases such as cuttings carried in the drilling fluid are easy to block the oil and gas channels. When the drilling fluid pressure is higher than the formation pressure, the drilling fluid penetrates into the formation, and the solid phases such as cuttings, which are smaller than the oil and gas passages in the formation, will go deeper, forming blockages and leaking formations. It makes the drill bit easy to pack mud, pull out the piston, induce blowout, and cause pressure surge when running down the drill, causing well leakage and eventually polluting the oil layer

And a large amount of debris deposition will reduce the ROP

[0008] If the solid phase such as cuttings in the drilling fluid cannot be effectively removed, the mud cake will become loose and thick, resulting in large water loss and easy wall collapse; the hole becomes smaller and the pipe is easy to stick; causing pressure differential sticking

A large number of solid phase deposits such as cuttings will increase the friction coefficient and torque, which will increase power consumption, and easily cause drill tool accidents and reduce the life of the drill tool

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