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A high-efficiency plugging removal system, preparation method and application of polymer flooding injection well

A technology for injecting wells and polymers, applied in drilling compositions, chemical instruments and methods, and production fluids, etc., can solve problems such as pressure rise, oil well production reduction, and dispensing volume reduction, and achieve wide water salinity. , the effect of fast degradation speed and high degradation effect

Active Publication Date: 2022-08-02
CNOOC TIANJIN BRANCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although the above-mentioned prior art uses similar substances, its function, structure and performance cannot or better solve the defects in the prior art
[0005] In order to solve the problems such as the decrease of injection volume, the increase of pressure and the decrease of oil well production caused by the clogging of polymer flooding injection wells encountered in the polymer flooding process of onshore and offshore oilfields, the present invention provides a method applicable to onshore and offshore oilfields. Composite chemical plugging agent for polymer flooding injection well plugging in offshore oilfields

Method used

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  • A high-efficiency plugging removal system, preparation method and application of polymer flooding injection well
  • A high-efficiency plugging removal system, preparation method and application of polymer flooding injection well
  • A high-efficiency plugging removal system, preparation method and application of polymer flooding injection well

Examples

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Embodiment 1

[0023]This embodiment provides a single redox system and a polymer flooding injection well high-efficiency plug-removing system added with a gel group disintegrating agent. A single redox system is 25 parts by mass of sodium bromate and sodium bisulfite (molar ratio is 1:1), and 75 parts by mass of water are added to the container, stirred and mixed evenly, and the redox system used in this case can be obtained. The high-efficiency plug-removing system for polymer flooding injection wells with gel group disintegrating agent is 25 parts by mass of sodium bromate and sodium bisulfite (molar ratio is 1:1), 25 parts by mass of hydroxyethylidene diphosphonic acid and Disodium EDTA (its mass ratio is 7:3) and 50 parts by mass of water are added to the container, stirred and mixed evenly to obtain the polymer flooding injection well high-efficiency plug-removing system used in this example.

[0024] Using 40000mg / L injection water, the single redox system and the polymer flooding inj...

Embodiment 2

[0028] This example provides a high-efficiency plug-removing system for polymer flooding injection wells with gel mass dispersing agents, which are hydroxyethylidene diphosphonic acid (HEDP) and ethylenediaminetetraacetic acid disodium (EDTA-Na) respectively. 2 ), and mixtures of the two.

[0029] 25 parts by mass of sodium bromate and sodium bisulfite (molar ratio is 1:1), 25 parts by mass of hydroxyethylidene diphosphonic acid, and 50 parts by mass of water were added to the container, stirred and mixed to obtain this implementation. For example, the high-efficiency plug removal system (containing HEDP) used in polymer flooding injection wells.

[0030] 25 parts by mass of sodium bromate and sodium bisulfite (molar ratio is 1:1), 25 parts by mass of disodium EDTA, and 50 parts by mass of water were added to the container, stirred and mixed well to obtain this. The high-efficiency plug removal system (EDTA-Na 2 ).

[0031] 25 parts by mass of sodium bromate and sodium bisu...

Embodiment 3

[0035] This case provides a high-efficiency plug removal system for polymer flooding injection wells containing different redox systems, 25 parts by mass of Na 2 S 2 O 8 and FeSO 4 (molar ratio is 1:1), 25 parts by mass of hydroxyethylidene diphosphonic acid and disodium EDTA (its mass ratio is 7:3), 50 parts by mass of water, mix well to obtain the required The high-efficiency plugging removal system for polymer flooding injection wells.

[0036] The difference is to use NaClO 7 and Na 2 S 2 O 3 , H 2 O 2 and FeCl 2 system instead of Na 2 S 2 O 8 and FeSO 4 , and the rest are the same as above.

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Abstract

The invention belongs to the technical field of oil and water well stimulation and injection in the petroleum industry, and discloses a high-efficiency plug-removing system for polymer flooding injection wells and its application. In terms of mass fraction, the proportion of each component of the high-efficiency plugging removal system of the polymer flooding injection well is 30-60% of the redox system and 40-70% of the gel group disintegrating agent. Compared with the traditional redox blockage removal system, the present invention can be formulated and used by water quality with different salinity, and has good degradation efficiency for polymers and their gels at a concentration of 0.05% to 5%. The purpose of the invention is to provide a high-efficiency plugging removal system for polymer flooding injection wells, which can disassemble the gel polymer into long-chain polymers, or make the long-chain polymers in an extended state; and then, under the action of the redox system, The long-chain polymer is broken into small molecules, the blockage caused by the polymer is relieved, and the injection pressure of the polymer flooding injection well is significantly reduced.

Description

technical field [0001] The invention belongs to the technical field of oil and water well stimulation and injection in the petroleum industry, and relates to a technology for removing blockage with a plug-removing agent used for polymer flooding injection wells in oilfield production engineering, in particular for the reduction of water injection wells using polyacrylamide and its derivatives as oil-displacing polymers. Pressure injection technology. Background technique [0002] In recent years, with the continuous shortage of energy in the world and the continuous development of the petroleum industry, tertiary oil recovery technology has gradually attracted people's attention and has made great progress. It has become one of the most promising tertiary oil recovery methods at home and abroad. Since the 1960s, more than 200 oilfields or blocks around the world have carried out polymer flooding tests, and polymer flooding technology has become one of the important stimulat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/524E21B43/22
CPCC09K8/524E21B43/16
Inventor 高建崇张春生宁永庚
Owner CNOOC TIANJIN BRANCH
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