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Releasing device

A technology of center pipe and casing, which is applied in the direction of wellbore/well parts, earthwork drilling and production, etc., can solve the problems that the cementing operation cannot be carried out, and achieve the effect of avoiding the obsolescence of the oil well, simple and compact structure, and convenient processing

Active Publication Date: 2015-12-16
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method of rotating resistance will cause the release device to be completed ahead of time before the liner hanger is delivered to the designed position, making subsequent cementing operations impossible

Method used

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Embodiment Construction

[0024] The present invention will be further described below in conjunction with accompanying drawing.

[0025] The main purpose of the hand-discharging device according to the present invention is to discard the liner hanger after it has been sent into a set position. Such as figure 1 and 2 As shown, the hand-discharging device 10 according to the present invention includes a core tube assembly 2 . The core tube assembly 2 includes a central tube 201 , and pipe joints 202 and support members 203 respectively disposed at two ends of the central tube 201 . Preferably, the pipe joint 202 and the support member 203 are respectively sleeved on the upstream end and the downstream end of the central pipe 201 through a threaded structure. The pipe joint 202 includes a transmission member 201a provided on the outer wall of its body. The transmission member 201a is preferably a pin, for example fixed in the body of the pipe joint 202 through a screw structure.

[0026] According t...

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PUM

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Abstract

The invention relates to a releasing device which comprises the components of a core pipe assembly that comprises a central pipe and a pipe type joint that are in butt-joint with each other, wherein the outer circumferential wall of the pipe type joint is provided with a transmission member; a first outer sleeve which sleeves the central pipe and the pipe type joint and is fixed with the pipe type joint through a shearing component, wherein the first outer sleeve comprises a rotation facilitating track hole which is arranged on the circumferential wall; a second outer sleeve which sleeves the central pipe and is connected with the first outer sleeve through a plug-in rotation facilitating structure; and a snapping assembly which is used for preventing disengagement of the second outer sleeve from the first outer sleeve in an axial direction, wherein the core pipe assembly is constructed for causing failure of the shearing component under the function of an external force and driving the transmission member to move along the extending direction of the rotation facilitating track hole of the first outer sleeve so that a restriction to the second outer sleeve is released when the second outer sleeve functions on the snapping assembly. The releasing device according to the invention can effectively prevent an over-early releasing problem.

Description

technical field [0001] The invention relates to the technical field of well cementing in oil and gas fields, in particular to a hand-discharging device for downhole. Background technique [0002] During the cementing process, the hands-off device is one of the key components of the rotary liner hanger. Whether the release device can successfully send the liner to the designed position in the well, whether it can be successfully released after hanging, and whether the liner can be rotated smoothly during the liner entry and cementing process are all tests of its performance. key indicators of . [0003] At present, the existing throwing devices all adopt reverse buckle and forward turning to throw away. When the hands-free device is lost, it is necessary to drive the nut of the hands-free device to rotate forward by rotating the drilling tool forward, thereby releasing the threaded connection between it and the liner hanger to realize the hands-free operation. After the ha...

Claims

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Application Information

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IPC IPC(8): E21B23/00
Inventor 阮臣良李夯马兰荣郭朝辉侯乃贺张瑞
Owner CHINA PETROLEUM & CHEM CORP
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