A coiled tubing tractor
The technology of a tractor and an oil pipe is applied in the field of downhole tools in oil and gas fields, which can solve the problems of the downhole tractor being in the initial stage and the like, and achieve the effects of simple and reliable structure, not easy to fail, and improved reliability.
Inactive Publication Date: 2018-07-24
YANGTZE UNIVERSITY
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Problems solved by technology
Domestically, foreign countries have adopted strict technical confidentiality measures, resulting in domestic research on downhole tractors is still in its infancy
Method used
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[0023] The coiled tubing tractor includes a rotating shaft 1 , a rotating sleeve A2 , a rotating sleeve B3 , a connecting shell 4 , a screw drive shaft 5 , a motor joint 6 and a thrust bearing 7 . The movable sleeve on the rotating shaft 1 is equipped with a rotating sleeve A2, and the rotating sleeve A2 is equipped with a rotating sleeve B3 through the rotating shaft 1. The rotating sleeve A2 and the rotating sleeve B3 are respectively provided with limiting shoulders, and the passage between the rotating sleeve A2 and the rotating sleeve B3 The cooperation of the limiting shoulders is engaged and connected with each other.
[0024] The rotary shaft 1 corresponding to the rotary sleeve A2 is provided with a cylindrical cam A8, and the inner wall of the rotary sleeve A2 corresponding to the cylindrical cam A8 is provided with a cam track groove A9.
[0025] The rotating shaft 1 corresponding to the rotating sleeve B3 is provided with a cylindrical cam B10, and the inner wall o...
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The invention relates to a coiled tubing tractor, belonging to the technical field of downhole tools of oil and gas fields. The tractor comprises a rotating shaft, a rotating sleeve A, a rotating sleeve B, a connection shell, a screw drive shaft, a motor joint and a thrust bearing, wherein the rotating sleeve A movably sleeves on the rotating shaft; the rotating sleeve B sleeves on the rotating sleeve A through the rotating shaft; limiting shoulders are respectively arranged on the rotating sleeve A and the rotating sleeve B; and the rotating sleeve A is connected with the rotating sleeve B in a clamping way through the matching of the limiting shoulders. When the tractor works, drilling fluid is taken as power for driving the screw drive shaft to rotate, so that the power is convenient to obtain, and the reliability is greatly improved. The coiled tubing tractor effectively solves the technical problems that the coiled tubing is difficult to enter a well and difficult to be taken out of the well because of relatively large downhole friction resistance and drill pressure is difficult to be applied, so that the coiled tubing can extend to be longer in the well.
Description
technical field [0001] The invention relates to a coiled tubing tractor, which belongs to the technical field of downhole tools in oil and gas fields. Background technique [0002] As early as the 1930s, people had a preliminary understanding of the concept and advantages of continuous drilling strings. During World War II, the Allies used coiled tubing to transport energy from the seabed to meet the needs of the war. According to reports, in 1962, California Petroleum Company and Bowen Tool Factory developed the first primitive "coiled tubing light repair device" to remove sand bridges in oil and gas wells in coastal areas. In 1964, Roy H. Culla Research Company developed a drilling system that used a continuous, flexible drilling string (outer diameter φ66.68mm) to circulate fluid, and used electric current to drive downhole electric motors, using A hydraulic injection head to run or retrieve the drilling string. This system once drilled a φ120.65mm test well with a dep...
Claims
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IPC IPC(8): E21B23/08
Inventor 夏成宇吕加华王杰冯定
Owner YANGTZE UNIVERSITY