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overshot

A technology of overshot and fishing device, which is applied in the direction of wellbore/well parts, earthwork drilling and mining, etc. It can solve the problems of plugging failure and other problems, and achieve the effects of avoiding failure of fishing, reducing operation intensity and saving operation cost

Active Publication Date: 2022-05-10
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The invention provides a salvage device, which can solve the problem of salvage failure of the plug installed in the eccentric hole of the eccentric water distributor

Method used

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Embodiment Construction

[0045] 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.

[0046] figure 1 A schematic structural view of an overshot according to an embodiment of the present invention is illustrated. as attached figure 1As shown, the overshot includes: a rope cap 1, a main body 2, a first locking wheel device 3, a guide claw 4 and a first spring 5; the rope cap 1 is connected to the upper end of the main body 2, and the side of the main body 2 is provided with a first long groove and the second long groove, the first locking wheel device 3 and the guide pawl 4 are respectively connected with the pin shaft of the main body 2, the first locking wheel device 3 can lock the guide pawl 4 in the first long groove, and the two parts of the first spring 5 The ends are respectively fixedly connected with the side ...

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Abstract

The invention discloses an overshot, which belongs to the technical field of oil and gas well workover. The overfishing device comprises: a rope cap, a main body, a first locking wheel device, a guide claw, a first spring, a slide bar, a connecting sleeve, a second locking wheel device, a fishing device and a second spring. In the present invention, the guide pawl and the pushing mechanism are correspondingly locked in the first long groove and the second long groove through the first lock wheel device and the second lock wheel device respectively. The overshot is lowered into the oil and gas well, and lowered to the bottom of the eccentric water distributor. Lift the overshot, so that after the first lock wheel device and the second lock wheel device rotate in reverse, the guide pawl pops out of the first long slot, and the pushing mechanism pops out of the second long slot. The overshot is lowered again, so that the overshot is set on the plug under the guiding action of the guide claw. Then lift up and quickly release the slide bar to apply force to the main body, and then apply force to the rotating mechanism through the pushing mechanism, thereby driving the fishing head to rotate and grasp the plug, and then lift the overshot to realize the fishing of the plug.

Description

technical field [0001] The invention relates to the technical field of oil and gas well workover, in particular to an overshot. Background technique [0002] In the production process of oil and gas wells, due to the different water absorption capacity of different oil and gas layers, the water injection volume of different oil and gas layers is also different. Therefore, plugs can be installed in each oil and gas layer to adjust the amount of water injected into each oil layer through the plug. Wherein, the plug is installed in the eccentric hole of the eccentric water distributor. However, as the total amount of water injection in each oil layer increases, the water absorption capacity of each oil layer may change. At this time, the water injection volume adjusted by the plug may not meet the water injection volume required by each oil layer. Salvage and replace with a suitable plug. [0003] In the related art, the fishing head part of the overshot is provided with claw...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B31/20
CPCE21B31/20
Inventor 杨海超宋祖厂胡石锋汪文昌盖旭波张津红赖学明卫海涛王旭东刘忠玮
Owner PETROCHINA CO LTD