Motor-driven underground tractor for coiled tubing

Abstract

The invention belongs to the field of oil and gas field development and relates to a tractor used for drilling, logging and well repair engineering of a coiled tubing and favorable for the coiled tubing to extend into a horizontal well section for a longer distance. A motor-driven underground tractor for the coiled tubing comprises an upper tractor system, a hexagonal central sliding pipe and a lower tractor system, wherein the upper tractor system comprises an upper supporting unit, an upper electric drive and control unit and an upper traction unit; and the upper tractor system and the lower tractor system have the same structure, and are connected at the upper part and the lower part of the hexagonal central sliding pipe respectively in a sleeving way and mounted in the same or opposite direction. The tractor is directly driven and controlled by a servo stepper motor, so that the dependence on liquid energy in the process of driving the tractor by using circulating liquid and the complexity of control of a hydraulic valve of the circulating liquid on a pipeline are reduced and most of space occupied by the hydraulic pipeline is saved; and the tractor can perform dual-direction traction, is good in stability, flexible in traction and fast in traction speed, can be suitable for underground traction work of small well holes, and can guarantee normal underground liquid circulation in the traction process.

Description

technical field [0001] The invention belongs to the field of oil and gas field development, and in particular relates to a tractor used for coiled tubing drilling, well logging and workover projects, which helps the coiled tubing run into a longer distance in a horizontal well section. Background technique [0002] Coiled tubing has a wide range of uses: it can be used for cleaning pipelines to flush sand plugs, wax removal, selective acidification, gas lift production, cement squeeze plugging, well killing, negative pressure perforating, well testing, displacement of drilling fluid, large Deviated well logging, horizontal well logging, well completion, fishing, tripping and setting expansion splitter, drilling plug, grinding and falling fish, permanent installation as production pipe, bottom hole camera, small experience drilling, secondary Drilling and deepening drilling, casing window sidetracking, tubing subsidy, etc., can be used for horizontal well drilling, cased well d...

AI Technical Summary

Problems solved by technology

[0009] In order to overcome the defects of the prior art, the object of the present invention is to provide a motor-driven coiled tubing downhole tractor, which utilizes four servo motors to effectively drive and control the tractor to pull the coiled tubing string downhole smoothly into and out, solving the problem of Due to the large friction of the downhole coiled tubing, it is difficult to run in and take out the coiled tubing and other technical problems, so that the coiled tubing can be extended longer in the downhole

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