Device and method for taking out casing pipe
A casing and pipe section technology, applied in the field of oil and gas field exploitation, can solve the problems of increasing labor intensity and achieve the effect of reducing labor intensity and avoiding casing damage
Inactive Publication Date: 2020-05-05
PETROCHINA CO LTD
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Problems solved by technology
When the unloading position is the joint between the intact casing sections, the intact casing section will be brought out to the wellhead along with the damaged casing section, which increases the labor intensity
Method used
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[0102] Unless otherwise defined, all technical terms used in the embodiments of the present invention have the same meanings as commonly understood by those skilled in the art. In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0103] In oil well production, one end of the casing is located at the wellhead, and the other end is fixed downhole and communicated with the production layer. The casing includes a plurality of sequentially connected casing sections, and the adjacent casing sections are threaded. The threaded connection between the casing sections can be realized in the following way: the top of each casing section is provided with an external thread, and the bottom end is provided with an internal thread, and the bottom end of the upper casing section of the two adjacent casing sect...
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The invention discloses a device and method for taking out a casing pipe, and belongs to the field of oil and gas field exploitation. The device comprises a first anchoring mechanism, a reversing mechanism and a second anchoring mechanism which are sequentially connected, wherein the first anchoring mechanism is used for being anchored with a first casing pipe section and driving the first casingpipe section to rotate; the reversing mechanism is used for converting torque in the first direction into torque in the second direction when the first anchoring mechanism rotates and transmitting thetorque in the second direction to the second anchoring mechanism, and the second direction is opposite to the first direction; and the second anchoring mechanism can be anchored with a second casingpipe section in an unsealed mode and is used for fixing the second casing pipe section. According to the device and method for taking out the casing pipe, the first anchoring mechanism drives the first casing pipe section to rotate, rotation of the second casing pipe section is limited through the torque in the second direction on the second anchoring mechanism, threaded connection between the first casing pipe section and the second casing pipe section is loosened, and the position of the loosened connection position can be accurately positioned as the connection position between the first casing pipe section and the second casing pipe section.
Description
technical field [0001] The invention relates to the field of oil and gas field exploitation, in particular to a device and method for taking out a casing. Background technique [0002] When producing oil in an oil field, an oil well is first drilled in the oil field, and the bottom of the oil well is connected with the production layer. Then the casing is run in the oil well, one end of the casing is located at the well head, and the other end is connected with the production layer. The sucker rod is lowered into the casing, and the crude oil in the production layer is extracted to the surface through the sucker rod. The casing includes a plurality of sequentially connected casing sections, and the adjacent casing sections are threaded. During the production process, when damage such as deformation or corrosion perforation may occur on some casing sections, it is necessary to take out the damaged casing section for subsequent replacement work. [0003] In the prior art, t...
Claims
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Login to View More IPC IPC(8): E21B31/20E21B31/12
CPCE21B31/12E21B31/20
Inventor 王小兵王健邹立业
Owner PETROCHINA CO LTD