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A telescopic, tractor technology, applied in wellbore/well components, earth-moving drilling, etc., can solve the problems of large downhole friction, difficulty in running and taking out, and difficult WOB, etc. , high power and good stability
Active Publication Date: 2018-03-30
YANGTZE UNIVERSITY
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[0003] The purpose of the present invention is to provide a coiled tubing tractor with a simple structure, which can effectively solve the problems of the existing tractors such as large downhole friction, difficulty in running in and out, and difficult application of drilling pressure
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[0017] The telescopic downhole tractor is composed of an upper joint 1, a casing 2, a turbine shaft 3, a swash plate hydraulic pump, a distributor 4, a telescopic oil cylinder 20 and a telescopic head. The turbine shaft 3 is installed in the casing 2 through the symmetrically arranged turbine bearings 5; the turbine assembly 6 (including the rotor and the stator) is arranged on the turbine shaft 3 between the turbine bearings 5, and the casing 2 below the turbine shaft 3 passes through the hydraulic pump bearing 7 is equipped with a swash plate hydraulic pump. The swash plate hydraulic pump consists of a main shaft 8, a hydraulic pump swash plate 9, a hydraulic pump flow plate 10, a hydraulic pump cylinder 11, a hydraulic pump plunger 12, a plunger spring 13, a hydraulic pump oil tank 14, an oil outlet pipe 15, an oil return pipe 16, The oil tank piston 17 and the oil tank spring 18 are formed, the hydraulic pump oil tank 14 is installed under the hydraulic pump cylinder 11 th...
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Abstract
The invention relates to a retractable type downhole tractor, and belongs to the technical field of oil and natural gas downhole tractor tools. The retractable type downhole tractor is composed of anupper joint, a shell, a turbine shaft, a swash plate hydraulic pump, a flow distributing device, a telescopic oil cylinder and a telescopic head. The turbine shaft is installed in the shell through symmetrically arranged turbine bearings, the swash plate hydraulic pump is installed in the position, below the turbine shaft, of the shell through a hydraulic pump bearing, the flow distributing deviceis installed in the position, below the swash plate hydraulic pump, of the shell, and the flow distributing device communicates with the swash plate hydraulic pump; and a rear clamping jaw oil cylinder and the telescopic oil cylinder are sequentially installed in the positions, below the flow distributing device, of the shell, and the rear clamping jaw oil cylinder and the telescopic oil cylindercommunicate with the flow distributing device. According to the retractable type downhole tractor, telescopic movement of a front clamping jaw oil cylinder, the rear clamping jaw oil cylinder and thetelescopic oil cylinder are controlled through the flow distributing device, so that forward movement of the tractor is achieved, the problems that downhole friction resistance of an existing tractoris large, tripping-in and taking-out are difficult, and bit pressure is difficult to apply are effectively solved, and the retractable type downhole tractor is particularly suitable for being used for coiled tubing traction in operation of well workover, well completion and the like.
Description
technical field [0001] The invention relates to a retractable downhole tractor, which belongs to the technical field of oil and gas downhole traction tools. Background technique [0002] The downhole tractor is the downhole crawler, also known as downhole crawler, downhole tractor, downhole traction robot, downhole hydraulic pressurizer, downhole drill bit thruster, etc. It is a downhole tool that can provide traction at the bottom of the well. Downhole tractors can be divided into three types according to their movement principles: roller crawling type, crawler crawling type (chain rail type) and grabbing arm telescopic sliding type (stepping type), among which the wheel type appeared first, followed by the telescopic type, and the crawler type latest. Traction crawlers can be divided into three types according to their energy sources: CT type, cable type and hybrid type. As far as the country is concerned, strict technical secrecy measures have been taken abroad, so that...
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Application Information
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