Special drill pipe joint for stepped directional crossing without elevator

Abstract

The invention discloses an elevator-step free directional crossing dedicated tool joint, which belongs to the field of oil exploration, and includes a main body and a welding neck, wherein a slope surface for transition is arranged between the outer surface of the main body and the outer surface of the welding neck. According to the invention, an elevator step structure matched with an elevator and necessary for an oil drilling drill rod is removed, and the elevator-step free directional crossing dedicated tool joint is designed to solve the problem in the prior art that a great size difference exits between the oil drilling elevator step joint and the drill rod pipe body; and the elevator-step free directional crossing dedicated tool joint not only reduces the weight thereof and the cost of raw material of the drill rod, but also increases the inner diameter of a drill stem, reduces the water power friction, and improves the water-horse power of drilling fluid as the service performance of the drill rod is the same as that of the oil drilling drill rod with the same size as the pipe body, the drill rod pipe body with the drill rod of bigger size can be adopted under the premise that the slip size of a directional crossing drilling rig and the stretching capability are unchanged, therefore, the tool joint meets the requirements for trenchless pipeline laying technology.

Description

technical field [0001] The invention relates to a drill pipe joint, in particular to an elevator-free step-type special drill pipe joint for directional crossing in the construction process of oil and gas pipelines. Background technique [0002] At present, in the construction of oil and gas pipelines at home and abroad, trenchless pipeline laying technology, that is, directional crossing technology, is often used where the pipeline passes through rivers and canyons. In the directional crossing construction, special directional crossing drilling rigs are used. Due to the lack of special directional crossing drill pipes, the drill pipes used are those used in oil exploration and development. [0003] In the process of oil exploration, the drilling rigs are all vertical, and the drill string needs to be lifted and lowered many times to replace the drill bit during the construction process. The elevator steps are used to withstand the axial tension during the drilling process....

AI Technical Summary

Problems solved by technology

Due to the limited slip size of the drill pipe used for directional penetration, and the outer diameter of the drill pipe joint used for oil exploration is much larger than the outer diameter of the pipe body, thus limiting the use of large-size drill pipe

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