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Gas lift reverse circulation negative pressure sand cleaning method and sand cleaning device

A technology of gas lift reverse circulation and sand cleaning, which is applied in earthwork drilling, wellbore/well components, construction, etc., which can solve the problems of pressure drop, leakage, and inability to carry sand out of the wellbore through sand settling in the wellbore, so as to improve the timeliness, Reduced operating costs and less risk of sand jams

Active Publication Date: 2019-08-30
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 lift reverse circulation negative pressure sand cleaning method and sand cleaning device
  • Gas lift reverse circulation negative pressure sand cleaning method and sand cleaning device
  • Gas lift reverse circulation negative pressure sand cleaning method and sand cleaning device

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Such as figure 1 The present invention provides a gas-lift reverse cycle negative pressure sand cleaning method, which includes the following steps: injecting compressed gas into the sand cleaning device, the compressed gas expands in the sand cleaning device, and the inside of the sand cleaning device The pressure of the wellbore forms a negative pressure relative to the pressure in the wellbore. Under the action of negative pressure, the sand and well fluid in the wellbore enter the sand cleaning device and are discharged by gas lift in the sand cleaning device. Realize sand removal. With the above technical scheme, the bottom of the wellbore maintains negative pressure during the whole process of sand removal, which can effectively prevent sand from pouring into the formation and effectively protect the reservoir; there is no leakage during the sand removal process, no pollution to the formation, no need for flowback and resumption of production, and high efficiency ...

Embodiment 2

[0035] In order to realize the gas lift reverse circulation negative pressure sand cleaning method, such as figure 2As shown, the present invention also provides a gas-lift reverse cycle negative pressure sand cleaning device, the inside of the injection outer pipe 1 is sequentially provided with the injection inner pipe 2 and the gas-water mixer 3, and the injection inner pipe 2 The outer wall and the inner wall of the spraying outer tube 1 form an annular space, and the side wall of the spraying outer tube 1 is provided with a through hole 11, and the through hole 11 arranged on the side wall of the spraying outer tube 1 is preferably a supply gas And / or the through hole for the liquid to flow in one direction 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 length of the spray inner tube 2 is less than The length of the spraying outer pipe 1, the top of the spraying inner pipe 2 is s...

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Abstract

The invention relates to a gas life reverse-circulation negative pressure sand-cleaning method and apparatus; the gas life reverse-circulation negative pressure sand-cleaning method comprises the steps of injecting compressed gas into the sand-cleaning apparatus, allowing the compressed gas to expand in the sand-cleaning apparatus, with inner pressure of the sand-cleaning apparatus generates negative pressure relative to inner pressure of a shaft, charging deposited sand in the shaft and borehole fluid into the sand-cleaning apparatus under the action of negative pressure, and discharging from inside of the sand-cleaning apparatus via gas life so that sand cleaning is achieved. The gas life reverse-circulation negative pressure sand-cleaning apparatus comprises an outer spray pipe and an inner spray pipe that are concentric, the inner spray pipe and a gas-water mixer are arranged in the outer spray pipe in sequence, an annular space is formed between the outer wall of the inner spray pipe and the inner wall of the outer spray pipe, the sidewall of the outer spray pipe is provided with through holes, the length of the inner spay pipe is less than that of the outer spray pipe, the gas-water mixer is disposed at the bottom of the inner spray pipe, and the bottom of the outer spray pipe is provided with a drill-grinding structure.

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 cleaning method and a sand cleaning 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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B21/00E21B21/16
Inventor 白彦明李斌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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