Motor-driven underground tractor for coiled tubing
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A motor-driven, tractor technology, applied in the field of tractors, can solve the problems of large coiled tubing friction, difficulties in running in and taking out coiled tubing, etc., and achieve the effects of saving occupied space, not easy to turn over, and large speed control range
Active Publication Date: 2012-12-05
CHINA UNIV OF PETROLEUM (BEIJING) +1
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[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
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[0044] Such as Figure 1-2 As shown, the motor drives the coiled tubing downhole tractor, including the upper tractor system 1, the hexagonal center slide pipe 2, and the lower tractor system 3; upper and lower.
[0045] Such as figure 1As shown in -3, there is a hollow circular circulating water eye in the middle of the hexagonal center slide tube 2, and the outside is a regular hexagon. There are an upper protruding flange 22 and a lower protruding flange 24; the upper hexagonal center slide tube screw 21 and the lower hexagonal center slide tube screw 23 are respectively assembled on the upper protruding flange 22 and the lower protruding flange 24 by bolts; the hexagonal center slide tube 2 The upper end is connected to the downhole coiled tubing, and the lower end is connected to the bottom hole assembly.
[0046] Such as figure 1 As shown, the upper tractor system 1 includes an upper support unit 11 , an upper electric drive and control unit 12 and an upper traction ...
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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...
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