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Oil extraction method for salt-containing oil well

A technology for oil wells and salt control, which is applied in the fields of production fluids, earth-moving drilling, wellbore/well components, etc., can solve the problems of unsatisfactory salt removal and salt control effects of wellbore salt crystallization, improve the salt removal and control effects, and shorten the flow velocity buffer. area, the effect of improving oil production efficiency

Active Publication Date: 2021-07-09
PETROCHINA CO LTD
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Problems solved by technology

[0005]For deep saline oil wells, the above-mentioned single salt removal and prevention measures are not ideal for wellbore salt crystallization

Method used

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  • Oil extraction method for salt-containing oil well
  • Oil extraction method for salt-containing oil well
  • Oil extraction method for salt-containing oil well

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Embodiment Construction

[0041] In order to make the technical solutions and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0042] An embodiment of the present invention provides an oil recovery method for a salt-containing oil well, the oil recovery method comprising: continuously adding clean water or a salt-inhibiting agent solution into the wellbore of a target salt-containing oil well, and using the clean water or a salt-inhibiting agent solution as a salt-clearing and salt-inhibiting agent solution The liquid is used as salt-cleaning and preventing liquid and enters the wellbore for salt-cleaning and preventing operations. Wherein, the amount of mixed liquid is obtained by the following formula:

[0043]

[0044] Among them, V——mixing volume, unit: m 3 / sky;

[0045] Q w ——Water produced, unit: m 3 / sky;

[0046] gamma w —the specific gravity of produced wate...

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Abstract

The invention discloses an oil extraction method for a salt-containing oil well, and belongs to the technical field of oil extraction. The method comprises the following steps of continuously doping clean water or a salt inhibitor solution into a shaft of the target salt-containing oil well, wherein the clean water or the salt inhibitor solution enters the shaft as salt removal and prevention liquid to carry out salt removal and prevention operation; and performing oil extraction operation in cooperation with oil extraction equipment while the salt removal and prevention operation is carried out, wherein the oil extraction equipment adopts a gap bridge pump to deepen a tail pipe. The amount of the doped clean water or salt inhibitor solution is obtained through the following formula, wherein V is the liquid doping amount with the unit of m<3> / day, Qw is the water yield with the unit of m<3> / day, Gamma w is the specific gravity of produced water and the dimensionless amount, Cs is the salt concentration of initial output liquid with the unit of mg / L, and C0 is the critical salt concentration with the unit of mg / L and is a constant value. According to the method, aiming at the salt-containing oil well, especially the high-salt-content oil well, salt removal and prevention measures carried out in the oil extraction process are improved, the salt removal and prevention effect is remarkably improved, and the oil extraction efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of oil recovery, in particular to an oil recovery method for saline oil wells. Background technique [0002] For salt-containing oil wells, especially high-salt oil wells, the deposition of sodium chloride (rock salt) in the wellbore will cause the oil wells to fail to produce normally. Therefore, it is necessary to perform salt-cleaning and salt-prevention treatment on such oil wells during oil production. [0003] At present, the salt removal and prevention measures for saline oil wells include the following: one is the salt washing technology with water, the other is the chemical salt prevention technology, and the third is the long plunger oil well pump cleaning and salt prevention technology or the bridge pump deepens the tail. tube technology. [0004] In the process of realizing the present invention, the inventor has found that there are at least the following problems in the prior art: [0005] Fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/20E21B43/22
CPCE21B43/20E21B43/16
Inventor 程亮魏晓霞张海浪余满林朱秀雨周燕张祎何伟荣
Owner PETROCHINA CO LTD
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