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Deep blockage removal process of biological enzyme composite acid

A biological enzyme and compound acid technology, which is applied in wellbore/well parts, drilling compositions, cleaning tools, etc., can solve the problems of unsuitable for deep block removal, damage, and insignificant effect of blockage removal, and achieve the expansion of acidification. The effect of removing plugging area, enhancing efficacy and restoring formation permeability

Active Publication Date: 2019-07-30
SOUTHWEST PETROLEUM UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the commonly used plugging removal method is acidification plugging removal, but acidification plugging removal is only suitable for damage caused by some inorganic substances in the vicinity of the wellbore to the reservoir, not suitable for deep plugging removal, and for organic substances such as colloids, asphaltene and polymers, etc. Unblocking effect is not obvious

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1 A kind of bio-enzyme compound acid deep block removal process

[0020] A bio-enzyme compound acid deep plugging removal process, comprising the following steps: (1) injecting a bio-enzyme plugging agent into an oil well; (2) injecting a compound acid into the oil well; (3) injecting a displacement fluid into the oil well; (4) ) well shut-in response.

[0021] In this embodiment, the bio-enzyme plug-removing agent is mainly composed of pullulanase, cellulase, and mannanase in a ratio of 3:1:5 by weight; the preparation steps of the bio-enzyme plug-removing agent include: stirring Add 0.3 parts of biological enzymes into the tank, and then add 99.7 parts of distilled water, stir evenly, and you get the product.

[0022] In the present embodiment, compound acid is mainly made up of the raw material of following parts by weight: 15 parts of phytic acid, 22 parts of fruit acids, 7 parts of bioactive agents, 3 parts of biological chelating agents, 5 parts of mul...

Embodiment 2

[0036]Embodiment 2 A kind of bio-enzyme compound acid deep part deblocking process

[0037] A bio-enzyme compound acid deep plugging removal process, comprising the following steps: (1) injecting a bio-enzyme plugging agent into an oil well; (2) injecting a compound acid into the oil well; (3) injecting a displacement fluid into the oil well; (4) ) well shut-in response.

[0038] In this embodiment, the biological enzyme blocking agent is mainly composed of pullulanase, β-glucanase, and amylase in a weight ratio of 2:1:3; the preparation steps of the biological enzyme blocking agent include: Add 0.2 parts of biological enzymes, and then add 99.8 parts of distilled water, stir evenly, and the product is obtained.

[0039] In the present embodiment, the compound acid is mainly composed of the following raw materials in parts by weight: 12 parts of phytic acid, 18 parts of fruit acid, 3 parts of bioactive agent, 2 parts of biochelating agent, 3 parts of multi-effect acidifying a...

Embodiment 3

[0053] Embodiment 3 A kind of bio-enzyme compound acid deep part deblocking process

[0054] A bio-enzyme compound acid deep plugging removal process, comprising the following steps: (1) injecting a bio-enzyme plugging agent into an oil well; (2) injecting a compound acid into the oil well; (3) injecting a displacement fluid into the oil well; (4) ) well shut-in response.

[0055] In this example, the bio-enzyme plug-removing agent is mainly composed of cellulase, mannanase, and amylase at a ratio of 1:1:2. The preparation steps of the biological enzyme plug-removing agent include: adding 0.5 parts of biological enzymes into a stirring tank, and then adding 99.5 parts of distilled water, and stirring evenly to obtain the product.

[0056] In the present embodiment, the complex acid is mainly composed of the following raw materials in parts by weight: 20 parts of phytic acid, 30 parts of fruit acid, 10 parts of bioactive agents, 5 parts of biochelating agents, 8 parts of multi...

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PUM

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Abstract

The invention relates to the technical field of oil field blockage removal, in particular to a deep blockage removal process of biological enzyme composite acid. The deep blockage removal process of the biological enzyme composite acid comprises the following steps that (1) a biological enzyme blockage removal agent is injected into an oil well; (2) the composite acid is injected into the oil well; (3) displacement fluid is injected into the oil well; and (4) shut-in reaction is carried out. According to the deep blockage removal process of the biological enzyme composite acid, the formula andthe dosage of the composite acid are adjusted according to the actual situation on site, polymer macromolecules wrapped outside inorganic impurities are effectively degraded, the inorganic impuritieswrapped in the polymer macromolecules are fully exposed, fully erosion of the inorganic impurities by the subsequent acidification process is facilitated, so that the formation blockage of oil and water wells is removed in limiting and complete modes, the formation permeability is restored, and oil fields can recover the production capacity normally.

Description

technical field [0001] The invention relates to the technical field of plugging removal in oil fields, in particular to a deep plugging removal technology of biological enzyme compound acid. Background technique [0002] In low permeability oilfields, the reservoir development is poor, the reservoir pore radius is small, the clay content and shale content are high, and the median particle size is small. A slight clogging of this type of oil layer during the development process can result in a significant reduction in the production of the oil well, and an increase in the injection pressure of the water injection well, making injection difficult. At the same time, due to the characteristics of small pores, enhanced pore-throat effect, and high specific surface area of ​​low-permeability oilfield reservoirs, it directly has a significant impact on fluid flow, and the lower the permeability, the stronger the impact. As the injected water continues to advance, the seepage resis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B37/06C09K8/524C09K8/528
CPCC09K8/524C09K8/528E21B37/06
Inventor 李东元罗平亚张鹏志时际明苟桦鳞张修超王磊佘国锋赵红蕾游艳平
Owner SOUTHWEST PETROLEUM UNIV
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