Anticompress and anti-bending shouldered hook-shape teeth screwed connection structure

Abstract

The invention provides a hook-tooth thread connecting structure with resistance to compression and bending, comprising a coupling B with inner thread at two ends, conical sealing surface and torque shoulder and an annular tube A with outer thread at two ends, conical sealing surface and torque shoulder, wherein the outer thread of the end of annular tube A is screwed with inner thread of the end of coupling B by hook-tooth thread, D section of inner thread of the end of coupling B is provided with inner torque shoulder and inner sealing conical surface, C section of outer thread of the end of annular tube A is provided with outer torque shoulder and outer sealing conical surface, and the inner sealing conical surface of the end of coupling and the outer sealing conical surface of the end of annular tube respectively contact the outer and inner torque shoulder. The hook-tooth thread has the advantages that the connecting structure has good property with high-pressure and high bending load, achieves the same compression and collapsing strength with the tube body and realizes the optimizing main sealing surface of metal to metal to achieve higher and more reliable air-impermeability, thereby realizing the non-leaking of gas with high-pressure and high bending load.

Description

technical field [0001] The invention relates to a pipeline sealing connection structure, in particular to a compression-resistant and bending-resistant hook-shaped tooth thread connection structure, which is more suitable for oil casing thread connection structures for highly deviated wells and horizontal wells specially required by oil fields. Background technique [0002] There are more than 300 oil fields and nearly 100 gas fields on land in my country, forming many oil and gas well production bases. The buried depth of the oil layer is about 1000m~7000m. The oil pipes used in the exploitation of these oil and gas resources are casing and tubing. Casing, oil pipe and drill pipe are collectively referred to as oil well pipes. When in service, oil well pipes are connected by special threads into thousands of meters long pipe strings. The pipe string has to bear the combined stress of tension, compression, bending, internal pressure, external pressure and thermal cycle for...

AI Technical Summary

Problems solved by technology

In order to make up for the inherent shortcomings of the above-mentioned tooth types, people have designed some special threaded connections; Matched sealing cone surface, and a method of torque shoulder is designed near the conical sealing surface to make up for the lack of poor thread sealing performance

However, with the gradual reduction of oil and gas resources in nature, the difficulty of mining is becoming more and more difficult. The above methods are far from fully suitable for some high-pressure oil and gas wells, especially those with high compression resistance, bending resistance, highly deviated wells, and horizontal wells. Requirements, they are difficult to complete the use of oil and gas wells in complex formations

Images