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Gas lifting reverse circulation negative pressure sand fishing method and device

A technology of gas lift reverse circulation and negative pressure, which is applied in the direction of earthwork drilling, wellbore/well components, etc. It can solve the problems of inability to carry out the wellbore, leakage, and pressure drop in the wellbore, and achieve low risk of sand sticking, The effect of reducing operating costs and improving timeliness

Active Publication Date: 2017-05-10
库尔勒施得石油技术服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And because the pressure in the wellbore decreases for a long time, the liquid level drop is no longer located at the wellhead, but leaks in the wellbore, and the sand in the wellbore cannot be brought out of the wellbore by normal circulation.

Method used

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  • Gas lifting reverse circulation negative pressure sand fishing method and device
  • Gas lifting reverse circulation negative pressure sand fishing method and device
  • Gas lifting reverse circulation negative pressure sand fishing method and device

Examples

Experimental program
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Effect test

Embodiment 1

[0028] The invention provides a negative pressure dredging method for gas lift reverse circulation, such as figure 1 As shown, the sand fishing method includes the following steps: inject compressed gas into the sand fishing device, the compressed gas expands in the sand fishing device, and the pressure inside the sand fishing device forms a negative pressure relative to the pressure in the wellbore , the sand settling and well fluid in the wellbore enter into the sand fishing device under the action of negative pressure to realize sand fishing. Using the above technical scheme, the negative pressure is maintained at the bottom of the wellbore during the whole process of dredging sand, which can effectively prevent the sand from sinking into the formation and effectively protect the reservoir; during the dredging process, there is no leakage, no pollution and no stimulation of the stratum, no need for flowback and resumption of production, and high efficiency production, and t...

Embodiment 2

[0035] In order to realize the gas-lift reverse circulation negative pressure sand cleaning method, the present invention also provides a gas lift reverse circulation negative pressure sand removal device, such as figure 2 As shown, the sand dredging device includes a concentric spraying outer pipe 1 and a spraying inner pipe 2, and the inside of the spraying outer pipe 1 is sequentially provided with the spraying inner pipe 2, the air-water mixer 3 and the sand filter pipe 4 , the outer wall of the injection inner tube 2 and the inner wall of the injection outer tube 1 form an annular space, and the side wall of the injection outer tube 1 is provided with a through hole 11, and the through hole 11 is for supplying gas and / or The through hole for the one-way flow of liquid can be realized by installing a valve on the through hole; the through hole 11 is higher than the bottom of the spray inner tube 2, and the upper part of the spray inner tube 2 is sealed and fixed on the spray...

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Abstract

The invention relates to a gas lifting reverse circulation negative pressure sand fishing method and device. The gas lifting reverse circulation negative pressure sand fishing method comprises the following steps that compressed gas is injected into the sand fishing device and expanded in the sand fishing device, the pressure in the sand fishing device forms the negative pressure relative to the pressure in a mineshaft, and setting sand and well liquid in the mineshaft enter the sand fishing device under the effect of the negative pressure, so that sand fishing is achieved. The gas lifting reverse circulation negative pressure sand fishing device comprises a spraying outer pipe and a spraying inner pipe which are concentrically arranged, and the spraying inner pipe, a gas-water mixer and a sand filtering pipe are sequentially arranged in the spraying outer pipe. An annulus space is formed by the outer wall of the spraying inner pipe and the inner wall of the spraying outer pipe. Through holes are formed in the side wall of the spraying outer pipe. The length of the spraying inner pipe is smaller than that of the spraying outer pipe, a sand setting pipe is arranged at the bottom of the spraying outer pipe, and a drill-grinding structure is arranged at the bottom of the sand setting pipe.

Description

technical field [0001] The invention belongs to the field of oil and gas well exploitation, and particularly designs a gas lift reverse circulation negative pressure sand fishing method and a sand fishing device. Background technique [0002] Sand production in oil and gas wells is a common phenomenon in the process of oilfield development, and it is an essential technical measure to restore the normal production of oil and gas wells and remove sand from oil and gas wells. However, when oil and gas wells are producing oil and gas, the cuttings and mud sand in the oil and gas layers will be taken out of the formation and enter the wellbore. With the continuous development of oil and gas production, more and more mud and sand will be accumulated in the downhole to block the oil and gas flow channel of the slotted pipe, and the oil and gas production will become less and less, and the production layer will be buried. And because the pressure in the wellbore is reduced for a lo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B27/00
CPCE21B27/00
Inventor 李斌白彦明王天祥宋中华张强盛勇单全生黎强欧如学张卫贤崔航波张超赵创陆爱华
Owner 库尔勒施得石油技术服务有限公司
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