Electric control fluid drive coiled tubing downhole retractor

Abstract

The invention belongs to the field of oil gas development, and particularly relates to an electric control fluid drive coiled tubing downhole retractor. The electric control fluid drive coiled tubing downhole retractor comprises an upper slip support and traction system, a center slip pipe assembly, a control system and a lower slip support system, wherein the upper slip support and traction system is sleeved on the upper part of the center slip pipe assembly in a sliding manner, and can slide along the center slip pipe assembly up and down; and the control system and the lower slip support system are fixed on the lower part of the center slip pipe assembly. The retractor provided by the invention has the advantages that the control flexibility is better, the retractor is suitable for small hole downhole traction operation, the normal downhole fluid cycle is ensured in a traction process, the flexible winding adaptive ability is strong in the traction process, and the retractor can realize two-way traction; and most of retractors in China only can realize a single direction traction motion, the retractor provided by the invention can smoothly drag a pipe column to realize taking-out and putting-down operations, the flexibility is good, and the retractor can realize effective power-off protection.

Description

technical field [0001] The invention belongs to the field of oil and gas development, and in particular relates to an electronically controlled hydraulically driven coiled tubing downhole tractor, which is used for various downhole operations such as coiled tubing drilling, well completion, well logging, and workover, and helps coiled tubing Downhole, especially in slim holes, extended reach wells, and horizontal wells, the coiled tubing with a longer distance can be run in and out smoothly. Background technique [0002] Coiled tubing has a wide range of uses: it can be used to clean pipelines, 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 produc...

AI Technical Summary

Problems solved by technology

[0020] In order to overcome the defects of the prior art, the object of the present invention is to provide an electronically controlled hydraulically driven coiled tubing downhole tractor, which utilizes an electronic control module to control the servo motor so that two five-position five-way reversing valves can precisely control the hydraulic circuit, and Cooperate with the control of other valves to realize the effective hydraulic drive tractor to pull the coiled tubing string downhole and run in and out smoothly, which solves the technical problems such as the large friction resistance of the coiled tubing in the downhole, the difficulty in running in and out, and the difficulty in applying drilling pressure. Coiled tubing extends longer downhole

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