Drill pipes suitable for extended reach drilling in slim holes

Abstract

The invention relates to a drilling rod applicable to small-well-hole and large-displacement well drilling. The drilling rod does not need to be subjected to procedures of pulling out the drilling rod, piling a support and inserting an oil pipe, a petroleum drilling process is simplified, the petroleum drilling efficiency is improved and the cost is saved; meanwhile, a secondary shoulder is additionally arranged at an engaged part of a male buckle small end and a female buckle large end; the secondary shoulder and a main shoulder form a double-shoulder structure; a main shoulder face and a thread section have certain interference fit and the secondary shoulder just has a certain auxiliary upper buckle positioning function, so that the interference fit between the main shoulder face and the thread section is accurately realized; and furthermore, the secondary shoulder can also bear one part of load at a working state and has certain overload protection effect, and the anti-torque strength of the drilling rod can also be improved and the safety of the drilling rod is guaranteed.

Description

Technical field [0001] The invention relates to a drill rod suitable for large-displacement drilling of small wells, and belongs to the technical field of petroleum drill rods. Background technique [0002] Drill pipes are used in the drilling of oil, natural gas, water sources and mineral deposits, which are connected by drill pipe joints. [0003] In recent years, the oilfield has developed a new technology to extend the life of old wells, which is to drill the side of the casing window in the middle and lower sections of the original well, so that the well position is horizontally shifted several hundred meters in the oil layer and placed in the horizontal oil layer. , Regenerate old wells and obtain high yields, while greatly saving the cost of re-drilling. [0004] However, conventional drill pipes are not very suitable for this type of small hole large-displacement drilling: one is that the conventional drill pipe is not strong enough to be used for this type of drilling; the ...

AI Technical Summary

Problems solved by technology

[0004] However, conventional drill pipes are not suitable for this kind of drilling in small holes and large displacements: one is that the strength of conventional drill pipes is not high and cannot be used for this kind of drilling; the other is the process of inserting tubing after drilling holes with drill pipes Cumbersome, more difficult and costly to operate in this more complex drilling

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