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Chelating blockage relieving fluid applied to mid-high permeability sandstone reservoir and preparation method thereof

A medium-to-high-permeability, sandstone technology, which is applied in the field of chelation and plugging solution for medium-to-high-permeability sandstone reservoirs and its preparation, can solve the problems of low corrosion of the pipe string, low clay dissolution rate, and the inability of ordinary chelating agents to dissolve clay. Low corrosion resistance, low clay dissolution rate and low cost

Active Publication Date: 2018-08-07
河北峻极化工科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a chelation plugging removal system applied to medium and high permeability sandstone reservoir plugging removal, which can not only avoid the shortcomings of conventional acidification, but also solve the problem that ordinary chelating agents cannot dissolve clay, and it is compatible with conventional soil acid It has the characteristics of good stability, low corrosion rate to clay, no acid substances in the system, and low corrosion to equipment and pipe strings.

Method used

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  • Chelating blockage relieving fluid applied to mid-high permeability sandstone reservoir and preparation method thereof
  • Chelating blockage relieving fluid applied to mid-high permeability sandstone reservoir and preparation method thereof
  • Chelating blockage relieving fluid applied to mid-high permeability sandstone reservoir and preparation method thereof

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Effect test

Embodiment 1

[0019] The present invention is applied to medium and high permeability sandstone reservoir chelation plugging solution (GEL-B product), and its components and weight percentages are as follows:

[0020]

[0021] Above-mentioned iron ion stabilizer adopts the mixture of one or more of citric acid, erythorbic acid, EDTA (ethylenediaminetetraacetic acid); Surfactant adopts fluorocarbon surfactant, polyoxyethylene polyoxypropylene stearyl ether The mixture; the clay stabilizer adopts cationic quaternary ammonium salt; the auxiliary agent adopts the mixture of polyvinyl alcohol and low carbon alcohol ether.

[0022] Its preparation method is:

[0023] Add water, additives, DOTA derivatives, iron ion stabilizers, clay stabilizers, and surfactants into a round-bottomed flask in sequence, and stir and react for 4 hours in a water bath at 50°C to obtain the plugging solution product.

[0024] This product was applied to a certain well of CNOOC. After the plugging removal measures,...

Embodiment 2

[0026] The present invention is applied to medium and high permeability sandstone reservoir chelation plugging solution (GEL-B product), and its components and weight percentages are as follows:

[0027]

[0028] Above-mentioned iron ion stabilizer adopts the mixture of one or more of citric acid, erythorbic acid, EDTA (ethylenediaminetetraacetic acid); Surfactant adopts fluorocarbon surfactant, polyoxyethylene polyoxypropylene stearyl ether The mixture; the clay stabilizer adopts cationic quaternary ammonium salt; the auxiliary agent adopts the mixture of polyvinyl alcohol and low carbon alcohol ether.

[0029] Its preparation method is:

[0030] Add water, additives, DOTA derivatives, iron ion stabilizers, clay stabilizers, and surfactants into a round-bottomed flask in sequence, and stir and react for 4 hours in a water bath at 50°C to obtain the plugging solution product.

[0031] This product was applied to a certain well of CNOOC. After the plugging removal measures,...

Embodiment 3

[0033] The present invention is applied to medium and high permeability sandstone reservoir chelation plugging solution (GEL-B product), and its components and weight percentages are as follows:

[0034]

[0035] Above-mentioned iron ion stabilizer adopts the mixture of one or more of citric acid, erythorbic acid, EDTA (ethylenediaminetetraacetic acid); Surfactant adopts fluorocarbon surfactant, polyoxyethylene polyoxypropylene stearyl ether The mixture; the clay stabilizer adopts cationic quaternary ammonium salt; the auxiliary agent adopts the mixture of polyvinyl alcohol and low carbon alcohol ether.

[0036] Its preparation method is:

[0037] Add water, additives, DOTA derivatives, iron ion stabilizers, clay stabilizers, and surfactants into a round-bottomed flask in sequence, and stir and react for 4 hours in a water bath at 50°C to obtain the plugging solution product.

[0038] This product is applied to a certain well of CNOOC. After the plugging removal measures, ...

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Abstract

The invention discloses a chelating blockage relieving fluid applied to a mid-high permeability sandstone reservoir and a preparation method thereof. The chelating blockage relieving fluid contains the following components in weight percentage: 18-25 parts by weight of DOTA derivative, 4-10 parts by weight of ferrous stabilizer, 5-15 parts by weight of surfactant, 4-10 parts by weight of clay stabilizer, 5-12 parts by weight of assistant, and the balance of water. According to the preparation method, water, the assistant, the DOTA derivative, the ferrous stabilizer, the clay stabilizer and thesurfactant are sequentially added according to the proportion of the components in the chelating blockage relieving fluid applied to a mid-high permeability sandstone reservoir, and then are uniformly mixed and compounded, thus preparing the chelating blockage relieving fluid. The chelating blockage relieving fluid applied to a mid-high permeability sandstone reservoir and the preparation methodthereof not only can avoid defects of conventional acidification, but also can solve the problem of clay which cannot be solved by common chelating agents, and compared with conventional mud acid, thechelating blockage relieving fluid has the characteristics of being good in stability, low in corrosion ratio to clay, free from acid substances in the system, and low in corrosion to equipment and tubular columns.

Description

technical field [0001] The invention relates to the technical field of petroleum exploitation, in particular to a chelating plug-removing fluid applied to medium-high permeability sandstone reservoirs and a preparation method thereof. Background technique [0002] At present, conventional acidification is often used for plugging removal of medium-high permeability sandstone reservoirs, but there are the following problems: [0003] (1) Conventional acidification is highly corrosive and has high requirements for unblocking equipment; [0004] (2) Strong corrosion, easy to cause excessive dissolution of medium and high permeability layers, resulting in sand production in the formation; [0005] (3) If the flowback cannot be done in time, the secondary precipitation will cause serious damage to the formation; [0006] (4) It is difficult to treat the acidified flowback liquid. [0007] Therefore, how to design a medium and high permeability sandstone reservoir chelation plug...

Claims

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Application Information

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IPC IPC(8): C09K8/52
CPCC09K8/52
Inventor 黄霞张红娟杨欢
Owner 河北峻极化工科技有限公司