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Negative pressure de-plugging and oil extraction process and device

An oil production device and negative pressure technology, which is applied in the direction of wellbore/well valve devices, production fluids, earthwork drilling and production, etc., can solve the problems of secondary pollution of oil layers, high operation cost, and difficult operation, and achieve low operation cost , short cycle, simple and convenient operation

Active Publication Date: 2014-03-26
TIANJIN LONGXIN PETROLEUM MACHINERY MFG CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the effect of ultrasonic oscillation for plugging removal is not obvious; although acidification is effective for plugging removal, it will cause secondary pollution of the oil layer, and acidification construction requires a variety of large special vehicles and equipment, high operating costs and long cycles
Negative pressure deblocking technology is also researched and applied at present, but most of them need to be equipped with large-scale equipment (pump sets) on the ground, and are realized by packers and negative pressure generators, which have the problems of complex process and difficult operation

Method used

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  • Negative pressure de-plugging and oil extraction process and device
  • Negative pressure de-plugging and oil extraction process and device
  • Negative pressure de-plugging and oil extraction process and device

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Embodiment Construction

[0026] The present invention will be further described in detail below through the specific examples, the following examples are only descriptive, not restrictive, and cannot limit the protection scope of the present invention with this.

[0027] A negative pressure deblocking oil recovery process, the process steps are:

[0028] 1. Pretreatment of oil well casing:

[0029] 1. Pull out the original well pumping string.

[0030] 2. Scraping the inner wall of the casing: lower the casing scraper to perform casing scraping operation, scrape repeatedly 20m up and down at the packer setting position for 3 times, and then pull out the casing scraper to remove the burr at the casing perforation section And the wax, cement slag and other dirt adhered to the inner wall of the casing to prevent the packer from being scratched.

[0031] 3. Well drilling: Run the casing and drill the well to the designed well section, check the inner diameter of the casing, check whether the wellbore is...

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Abstract

The invention relates to a negative pressure de-plugging and oil extraction process which comprises the following steps: preprocessing an oil well sleeve; detecting the pressure of an oil layer and determining the negative pressure value for de-plugging; descending a negative pressure de-plugging device; installing a wellhead production tree; adjusting the height of the liquid column in an oil pipe above a negative pressure valve; opening the negative pressure valve; opening a well flushing valve; and descending a fishable oil well pump with the fixed valve to carry out the oil extraction operation. The invention also relates to the negative pressure de-plugging and oil extraction device which comprises the oil pipe, a plug, a sieve pipe, a packer, the negative pressure valve, the well flushing valve and the fishable fixed valve oil well pump, wherein the plug and the sieve pipe are sequentially installed at the bottom end of the oil pipe from bottom to top; and the packer seals and packs the annular space of an oil isolation sleeve. The invention has the obvious advantages of simple process, low operation cost, short period, good production increase effects on oil gas wells and strong generality, is safe and reliable, does not need large-scale auxiliary equipment and can obtain high economic effects.

Description

technical field [0001] The invention belongs to the technical field of oil recovery, in particular to a negative pressure plugging removal oil recovery process and device. Background technique [0002] Reservoir pollution is mainly caused by external factors, such as mud used in drilling and completion, fracturing fluid, acidizing fluid, well killing fluid used in workover operations, etc. All kinds of mechanical impurities, pollution and blockage caused by the chemical reaction between the intrusion fluid and the formation fluid will cause the permeability of the oil layer to decrease and the oil and gas production to decrease. Therefore, removing oil layer pollution and clogging, restoring and improving the permeability of the oil layer near the well can greatly increase the production of oil and gas wells, and fully tap the production potential of oil wells. Existing techniques for decontaminating and clogging oil reservoirs include ultrasonic vibration, acidizing and so...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/00E21B34/06E21B21/10
Inventor 张兵屠勇
Owner TIANJIN LONGXIN PETROLEUM MACHINERY MFG CO LTD
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