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Acidation blocking remover and preparation method thereof

A plugging agent and solvent technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of poor retarding effect, excessive consumption, and weakened retarding effect of authigenic acid, and achieve good complexation performance, The effect of slowing down the reaction speed and good retarding performance

Inactive Publication Date: 2013-04-03
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] (1) The HF component in the soil acid has too strong dissolution ability, which may easily cause the formation rock skeleton to be damaged;
[0004] (2) There is no pretreatment solution, and generally no complexing agent is added, if the flowback is not timely, it is easy to cause secondary precipitation;
[0005] (3) The treatment radius is small, generally less than 1.5 meters, and the deep pollution cannot be treated, and the validity period is short;
[0006] (4) Residual acid flowback is difficult after acidification, and the residual acid after flowback is likely to cause environmental pollution;
[0007] (5) It is easy to generate new pollution, and the flowback pressure difference is large, which can easily cause the dead oil and clay particles in the deep formation to migrate to the near wellbore area, causing a series of problems such as new blockage
However, these new acidizing plugging removers also have some problems: the active agent in the surfactant-type retarding acid forms a hydrophobic film on the rock surface to achieve the retarding effect, but due to the high-speed flow of the acid, the hydrophobic film is unstable, The retarding effect is weakened; the retarding effect of emulsified acid is not ideal, the consumption is too fast, and the flowback resistance is large; the retarding effect of authigenic acid is poor in clay strata

Method used

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  • Acidation blocking remover and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] This embodiment provides an acidifying plugging remover, which consists of the following components by weight percentage: main acid solution, 20%, corrosion inhibitor BSA-602, 0.1%, clay stabilizer BSA-101, 3%, auxiliary Discharge agent EL-11, 0.5%, demulsifier YBP-1, 0.1%, and the balance is water.

[0035] The acidifying plug-removing agent is prepared through the following steps:

[0036] (1) Add 5.0mL phosphorus trichloride, 4.5mL acetone, and 25.0mL glacial acetic acid successively in a dry three-necked flask with a reflux device, stir the solution continuously at room temperature with a magnetic stirrer, and react for 5 hours until the solution becomes clear, to obtain polymerized monomers;

[0037] (2) Dissolve 10 mL of polymerized monomer in 10 mL of distilled water, then add 5 mL of acrylic acid, and stir thoroughly to obtain a mixture;

[0038](3) Get 0.1g of ammonium persulfate and dissolve it in 5mL of distilled water, and add it to the mixture obtained in...

Embodiment 2

[0042] This embodiment provides an acidifying plugging remover, which consists of the following components by weight percentage: main acid solution, 20%, corrosion inhibitor BSA-602, 0.1%, clay stabilizer BSA-101, 3%, auxiliary Discharge agent EL-11, 0.5%, demulsifier YBP-1, 0.1%, and the balance is water.

[0043] The acidifying plug-removing agent is prepared through the following steps:

[0044] (1) Add 5.9mL phosphoric acid, 9.5mL methyl ethyl ketone, and 38mL lactic acid successively into a dry three-necked flask with a reflux device, stir the solution continuously at room temperature with a magnetic stirrer, react for 5 hours until the solution becomes clear, and obtain the polymerized monomer ;

[0045] (2) Dissolve 15 mL of polymerized monomer in 15 mL of distilled water, then add 15 mL of crotonic acid, and stir thoroughly to obtain a mixture;

[0046] (3) Get 0.1g of benzoyl peroxide and dissolve it in 15mL of distilled water, and add it to the mixture obtained in ...

Embodiment 3

[0050] This embodiment provides an acidifying plugging remover, which consists of the following components by weight percentage: main acid solution, 20%, corrosion inhibitor BSA-602, 0.2%, clay stabilizer BSA-101, 3%, auxiliary Discharge agent EL-11, 0.5%, demulsifier YBP-1, 0.1%, and the balance is water.

[0051] The acidifying plug-removing agent is prepared through the following steps:

[0052] (1) Add 10.0g of phosphorus pentasulfide, 9.8mL of dimethyl ketone, and 35mL of citric acid into a dry three-necked flask with a reflux device in sequence, and stir the solution continuously at room temperature with a magnetic stirrer, and react for 5 hours until the solution becomes clear. , to obtain polymerized monomers;

[0053] (2) Dissolve 10mL of polymerized monomer carefully in 10mL of distilled water, then add 15mL of methacrylic acid, and stir thoroughly to obtain a mixture;

[0054] (3) Dissolve 0.1g of potassium peroxide in 10mL of distilled water and add it to the mix...

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Abstract

The invention relates to an acidation blocking remover and a preparation method of the acidation blocking remover. The acidation blocking remover contains 20-30 percent of main acid liquor, 0.1-0.3 percent of inhibitor, 2-4 percent of clay stabilizer, 0.3-0.5 percent of cleanup additive, 0.05-0.1 percent of demulsifier and the balance of solvent by weight percent. The invention further provides a preparation method for the acidation blocking remover. The acidation blocking remover can improve the processing radius and corrosion effect of a blocking remover, and is suitable for blockage removal of an oil-water well.

Description

technical field [0001] The invention relates to an acidizing blocking removing agent, which is suitable for removing plugging in oil-water wells and belongs to the technical field of oil recovery in oil and gas fields in the petroleum industry. Background technique [0002] At present, the commonly used acidizing plugging removal technology is earth acid acidification. Earth acid is prepared by hydrochloric acid and hydrofluoric acid in a certain proportion. The hydrochloric acid is used to dissolve the carbonate salt and iron components in the sandstone formation and maintain a low pH value. Prevent the precipitation of calcium fluoride and silicon hydroxide; use the hydrofluoric acid to dissolve the blockage caused by siliceous minerals, drilling fluid, and expanded clay minerals, restore and increase the permeability of the near-wellbore area, and achieve production increase purpose of adding. However, in the field application, it was found that the conventional acidizin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/74C09K8/528
Inventor 蒋生健郎成山曲金明韩海龙张雪明高刚蒋官澄谢水祥
Owner PETROCHINA CO LTD
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