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Well cementing bump pressure shut-in sliding sleeve device

A sliding sleeve and impact pressure technology, which is applied in wellbore/well valve devices, wellbore/well components, earth-moving drilling, etc. Problems such as transformation and production loss, to achieve the effect of overcoming hidden dangers in the later stage, simple structure, and ensuring that it cannot be moved down

Inactive Publication Date: 2016-01-20
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] During horizontal well cementing operations, conventional floating hoops and floating shoes are placed horizontally, and the reliability is low. Some wells cannot be reliably closed after cementing operations, resulting in too long cement plugs in the horizontal section and poor sealing quality in the horizontal section. The quality of flat well cementing has a great adverse effect
The hidden dangers of cementing quality in the horizontal section and the casing shoe, as well as channeling and micro-annulus in the horizontal section caused by back flow of cement slurry or grinding plug in the horizontal section will bring huge losses to later reservoir reconstruction and production, and may even cause dislocations. The failure of stage fracturing, the investment in remedial measures arising from it is even more unpredictable

Method used

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  • Well cementing bump pressure shut-in sliding sleeve device
  • Well cementing bump pressure shut-in sliding sleeve device

Examples

Experimental program
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Effect test

Embodiment 1

[0024] In order to overcome the defects of floating hoops and floating shoes in conventional horizontal well cementing operations, a well shut-in sliding sleeve device with cementing bump pressure is provided. The late hidden danger of failure can prevent the backflow of cement slurry and achieve the purpose of improving the quality of cementing.

[0025] This embodiment provides a figure 1 The well-closing sliding sleeve device for cementing bumping shown includes a housing 9, the housing 9 includes a closing sliding sleeve 4 and a valve sleeve 5, and the valve sleeve 5 is placed in the inner cavity of the housing 9 through threaded connection , the closing sliding sleeve 4 is fastened in the inner cavity of the valve sleeve 5 through the shear pin 3, the upper part of the closing sliding sleeve 4 and the valve sleeve 5 is provided with a self-locking mechanism, and the lower part of the closing sliding sleeve 4 is provided with Circulation hole one 7, the lower part of the ...

Embodiment 2

[0030] In order to make the connection between the shut-in sliding sleeve device and the casing tighter, on the basis of Example 1, this implementation provides a figure 1 As a preferred embodiment of the well cementing bumper shut-in sliding sleeve device shown, the upper part of the casing 9 is provided with internal threads, and the lower part of the casing 9 is provided with external threads.

[0031] When using the shut-in sliding sleeve device for cementing operations, the inner thread of the upper part of the casing 9 is screwed to the lower part of the casing string, and the outer thread of the lower part of the casing 9 is connected to the upper part of the floating collar of the casing, and the casing operation can be completed. The safety and reliability of the construction process are improved by providing threads on the casing.

Embodiment 3

[0033] On the basis of Example 2, this implementation provides a method such as figure 1 As a preferred embodiment of the shown cementing bumper shut-in sliding sleeve device, the self-locking mechanism includes a self-locking ring 1 and an anti-retreat groove 2, and the self-locking ring 1 is located in the closing sliding sleeve 4 On the upper part of the outer wall, the anti-retraction groove 2 is located on the upper part of the inner wall of the valve sleeve 5. When the closing sliding sleeve 4 moves down and the first circulation hole 7 is located below the second circulation hole 8, the self-locking ring 1 and the anti-recession groove 2 at the same level. Further, the upper edge on the outer side of the closing sliding sleeve 4 is provided with an outer edge 6 of the closing sliding sleeve, and the upper edge on the inner side of the valve sleeve 5 is provided with a slope.

[0034] Due to the heavy pressure of the drilling fluid, the shear pin 3 is cut off and the cl...

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PUM

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Abstract

The invention provides a well cementing bump pressure shut-in sliding sleeve device, which comprises a casing, wherein the casing comprises a shut-in sliding sleeve and a valve sleeve, wherein the valve sleeve is connected and arranged into an inner cavity of the casing through screw threads; the shut-in sliding sleeve is fastened in an inner cavity of the valve sleeve through a shearing pin; a self-locking mechanism is arranged on the upper parts of the shut-in sliding sleeve and the valve sleeve; the lower part of the shut-in sliding sleeve is provided with a first circulation hole; and the lower part of the valve sleeve is provided with a second circulation hole. The well cementing bump pressure shut-in sliding sleeve device has the advantages that the structure is simple; the operation is easy; the reliability is high; and by putting the shut-in sliding sleeve on the upper part of a casing string float collar, the defect of later-period hidden danger of float collar failure is overcome, cement slurry is prevented from flowing back, and the goal of improving the well cementing quality is achieved.

Description

technical field [0001] The invention relates to the research field of cementing operations of horizontal wells in petroleum well completions, in particular to a well-closing sliding sleeve device for well cementing bumping pressure. Background technique [0002] During horizontal well cementing operations, conventional floating hoops and floating shoes are placed horizontally, and the reliability is low. Some wells cannot be closed reliably after cementing operations, resulting in too long cement plugs in the horizontal section and poor sealing quality in the horizontal section. The quality of flat well cementing has a greater adverse effect. The hidden dangers of cementing quality in the horizontal section and the casing shoe, as well as the channeling and micro-annulus in the horizontal section caused by backflow of cement slurry or grinding plug in the horizontal section, will bring huge losses to later reservoir reconstruction and production, and may even cause dislocati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B34/06E21B33/13
Inventor 段志锋黄占盈吴学升高云文欧阳勇周文军王勇茗赵巍王彦博张燕娜余世福蒙华军陈春宇
Owner PETROCHINA CO LTD