Drill rod joint

Abstract

The invention discloses a drill rod joint which comprises a male joint and a female joint, wherein the male joint and the female joint are connected together through a male joint thread and a female joint thread in a mutual fit manner; a main male joint shoulder and a secondary male joint shoulder are respectively arranged at two sides of the male joint thread; a main female joint shoulder and a secondary female joint shoulder are respectively arranged at two sides of the female joint thread; when the male joint and the female joint are at the connected state, a main shoulder sealing cabin and a secondary shoulder sealing cabin are respectively arranged between the male and female joint threads and the main male and female joint shoulders and the secondary male and female joint shoulders; and the length ratio of the secondary and main shoulder sealing cabins is 1:1.9-2.2. With the adoption of the drill rod joint with the structure provided by the invention, the stress is distributed more uniformly; the load can be shared by the two ends of a thread buckle with stronger rigidity; and the anti-torque performance can be increased by more than 30% under the condition of identical wall thickness.

Description

technical field [0001] The invention relates to a petroleum engineering drilling tool, in particular to a drill pipe joint. Background technique [0002] Petroleum resources are strategic resources and the blood of industry. Governments of all countries attach great importance to the production of petroleum energy. With the improvement of oil exploration technology and drilling equipment, it is easy for professionals to find geological formations that store oil on the earth. However, the current land shallow oil resources on the earth have been basically exhausted, coastal countries have turned to offshore oil drilling, and inland countries have sought deep oil resources by improving their drilling capabilities. Accompanied by deep wells, ultra-deep wells and enhanced drilling put forward higher requirements on the performance of drill pipe joints. The commonly used conventional API standard drill pipe joint is a single shoulder, which is located at one end of the connecti...

AI Technical Summary

Problems solved by technology

The commonly used conventional API standard drill pipe joint is a single shoulder, which is located at one end of the connecting thread of the joint. When the joint is fastened, the torque of the drill pipe is mainly borne by the shoulder surface, because the torsional strength and sealing performance are both It cannot meet the complex geological environment requirements; while the common double-shouldered drill pipe joints on the market have poor overall structure and cannot well disperse the stress on the drill pipe joint.

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