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Flowback-free fine blocking remover and preparation method thereof

A plug-removing agent and sophisticated technology, applied in the field of backflow-free fine plug-removing agent and its preparation, can solve the problems of fast reaction speed, affecting demulsification and electrolysis, and reducing efficiency, so as to prevent excessive dissolution and protect the reservoir. Skeleton Effects

Active Publication Date: 2021-06-15
北京峦海阜程科技发展有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Oil and water well plugging removal often faces two major problems. First, the agent cannot accurately enter the plugging removal layer, and the reaction speed is too fast, making it difficult to penetrate deep into the formation, and the effect is greatly reduced; Electrode, can not directly enter the process, you need to pour the flowback liquid into the flowback tank first, and then transfer to the process after the flowback liquid meets the requirements. This process can take at least one or two days, and at most four or five days, which seriously reduces the efficiency , affecting normal production

Method used

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  • Flowback-free fine blocking remover and preparation method thereof
  • Flowback-free fine blocking remover and preparation method thereof
  • Flowback-free fine blocking remover and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Non-flowback fine plugging agent, including the following raw materials in mass fractions: chelating agent, 6.5g cationic polyacrylamide, 2.75g potassium sulfate, 0.75g corn starch, 4g osmotic dispersant, 24g corrosion inhibitor, 704g water;

[0031] Wherein, chelating agent is made up of 10g iminodiacetic acid, 120g DTPA (diethylenetriaminepentaacetic acid), 8g sodium hydroxide, 120g nitrilotriacetic acid, and wherein, the base number of mass fraction is the raw material gross mass of preparing blocking agent, The total mass of raw materials is 1000g.

[0032] The osmotic dispersant is polyoxyethylene ether.

[0033] The corrosion inhibitor is dimethylthiourea.

[0034] The preparation method of non-flowback fine plugging remover comprises the following steps:

[0035] Step 1, cationic polyacrylamide, potassium sulfate, corn starch, and 500 g of water by mass fraction were mixed and stirred for 120 minutes, wherein the base of the mass fraction was the total mass of ...

Embodiment 2

[0039] Non-flowback fine plugging agent, including the following raw materials in mass fractions: chelating agent, 3g cationic polyacrylamide, 1.5g potassium sulfate, 0.5g corn starch, 2g osmotic dispersant, 20g corrosion inhibitor, 758g water;

[0040] Wherein, chelating agent is made up of 10g iminodiacetic acid, 120g DTPA, 5g sodium hydroxide, 80g nitrilotriacetic acid, and wherein, the basis of mass fraction is the raw material gross mass of preparation plugging agent, and raw material gross mass is 1000g.

[0041] The osmotic dispersant is polyoxyethylene ether.

[0042] The corrosion inhibitor is dimethylthiourea.

[0043] The preparation method of non-flowback fine plugging remover comprises the following steps:

[0044] Step 1, cationic polyacrylamide, potassium sulfate, corn starch, and 500 g of water were mixed and stirred for more than 125 minutes, wherein the base of the mass fraction was the total mass of raw materials used to prepare the plugging agent;

[0045...

Embodiment 3

[0048] Non-flowback fine plugging agent, including the following raw materials in mass fractions: chelating agent, 6.5g cationic polyacrylamide, 2.75g potassium sulfate, 0.75g corn starch, 4g osmotic dispersant, 24g corrosion inhibitor, 667g water;

[0049] Wherein, the chelating agent is made up of 15g iminodiacetic acid, 150g DTPA, 10g sodium hydroxide, 120g nitrilotriacetic acid, wherein, the base of the mass fraction is the total mass of raw materials for the preparation of plugging agent, and the total mass of raw materials is 1000g.

[0050] The osmotic dispersant is polyoxyethylene ether.

[0051] The corrosion inhibitor is dimethylthiourea.

[0052] The preparation method of non-flowback fine plugging remover comprises the following steps:

[0053] Step 1, cationic polyacrylamide, potassium sulfate, cornstarch, and 500 g of water were mixed and stirred for 140 minutes, wherein the base of the mass fraction was the total mass of raw materials used to prepare the pluggi...

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Abstract

The invention discloses a flowback-free fine blocking remover which comprises the following raw materials: a chelating agent, cationic polyacrylamide, potassium sulfate, corn starch, a permeation dispersant, a corrosion inhibitor and the balance of water, wherein the chelating agent is prepared from iminodiacetic acid, DTPA (Diethylene Triamine Pentacetate Acid), sodium hydroxide and nitrilotriacetic acid. The blocking remover has the beneficial effects that excessive dissolution is prevented, a reservoir framework is protected, the blocking remover can enter the deep part of a stratum, effective blocking removal is achieved, and the blocking remover can directly enter a flow path without flowback after blocking removal. The invention also discloses a preparation method of the flowback-free fine blocking remover. The preparation method comprises the following steps: step 1, the cationic polyacrylamide, the potassium sulfate, the corn starch and part of the water are mixed and stirred; 2, DTPA and sodium hydroxide are mixed for reaction, then the mixture, iminodiacetic acid, nitrilotriacetic acid, the permeation dispersant and the corrosion inhibitor are added into a reaction product obtained in the step 1, the rest of water is added, and the blocking remover is obtained through reaction. The method has the beneficial effects of simple preparation process and easiness in control.

Description

technical field [0001] The invention relates to the technical field of petroleum exploitation. More specifically, the present invention relates to a flow-back-free fine plug-removing agent and a preparation method thereof. Background technique [0002] Oil and water well plugging removal often faces two major problems. First, the agent cannot accurately enter the plugging removal layer, and the reaction speed is too fast, making it difficult to penetrate deep into the formation, and the effect is greatly reduced; Electrode, can not directly enter the process, you need to pour the flowback liquid into the flowback tank first, and then transfer to the process after the flowback liquid meets the requirements. This process can take at least one or two days, and at most four or five days, which seriously reduces the efficiency , affecting normal production. Contents of the invention [0003] It is an object of the present invention to solve at least the above-mentioned proble...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/528C09K8/514C09K8/90
CPCC09K8/528C09K8/514C09K8/905
Inventor 王晓程郭晓军黄德明
Owner 北京峦海阜程科技发展有限责任公司