Special buttress thread oil casing pipe connecting joint

Abstract

The invention relates to a special buttress thread oil casing pipe connecting joint. The special buttress thread oil casing pipe connecting joint comprises a male joint body and a female joint body; external threads of the male joint body and external threads of the female joint body are sawtooth-shaped threads; and each thread comprises a bearing face, a non-bearing face, a tooth top face and a tooth root face. The tooth top faces, the tooth root faces and the middle lines of the threads are parallel. The special buttress thread oil casing pipe connecting joint is characterized in that the included angles between the bearing faces of the sawtooth-shaped threads and the axial perpendicular face of the joint body are minus 5 degrees + 1 degree. The special buttress thread oil casing pipe connecting joint has the beneficial effects that the defects that an existing API buttress thread joint is low in connecting strength, poor in sealing capability and the like are overcome, and the improved bearing faces with the bearing faces of minus 5 degrees provide the excellent tensile strength and compressive strength. The barb-shaped sealing faces increase the structural strength of the oil casing pipe connecting joint, the bending and compression-resisting performance are improved, and the connecting joint is particularly suitable for being used under conditions with high deep wells and ultra-high deep wells. Due to design of the large screw pitch, the oil casing pipe connecting joint can be rapidly buckled, and the well descending efficiency of the oil field is improved.

Description

Technical field [0001] The invention belongs to a petroleum engineering drilling tool, and in particular relates to a special trapezoidal threaded tubing casing connection joint. Background technique [0002] At present, the shallow land oil resources on the earth have basically been exhausted, coastal countries have turned to offshore oil drilling, and inland countries have sought deep oil resources by improving their drilling capabilities. With the improvement of petroleum exploration technology and drilling equipment, deep wells, ultra-deep wells and enhanced drilling have put forward higher requirements on the performance of tubing and casing. [0003] Petroleum tubing is an important tool to exploit oil and natural gas. During the drilling process, it is a hub connecting the ground and underground. The oil casing pipe is connected by a joint, and the joint is processed with internal and external threads. In recent years, with the development of my country’s petroleum industr...

Images