Method for preparing cross-linked acid

A technology of cross-linking acid and cross-linking agent, applied in chemical instruments and methods, drilling composition and other directions, can solve the problems of limited communication reservoir range, short acid corrosion cracks, and poor effect of slow acid fracturing.

Pending Publication Date: 2020-05-08
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, the surface cross-linked acid technology has been continuously improved, and it has become an important acid system for acid fracturing of high-temperature carbonate reservoirs. The scope is limited, and the slow acid fracturing transformation effect is not good, etc.

Method used

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  • Method for preparing cross-linked acid
  • Method for preparing cross-linked acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0085] 1) Configure an aqueous solution of polymerized monomers, in parts by mass, 35 parts of acrylamide, 64 parts of 2-acrylamide-2-methylpropanesulfonic acid monomer (AMPS), 1.4 parts of N,N-dimethylacrylamide, Add 0.3 parts of cetyldimethylallylammonium chloride monomer into a beaker, add distilled water to dissolve, and make the total mass content of the four types of monomers be 25wt%;

[0086] 2) Add 1.0% urea, 0.05% sodium formate, 0.03% tetrasodium ethylenediaminetetraacetic acid, and 3.0% sodium lauryl sulfate to the above monomer aqueous solution (based on the total mass of the four monomers as 100%), 0.05% ethylenediamine, stir and dissolve evenly, put it in a 5°C water bath and cool for 30min, and let the temperature cool down to 5°C;

[0087] 3) Add a certain amount of sodium carbonate to the above solution to adjust the pH value of the solution to 9, continue to cool for 30 minutes, put it in a 5°C water bath to cool the temperature to 5°C, introduce the liquid ...

Embodiment 2

[0092] 1) Prepare an aqueous solution of polymerized monomers, in parts by mass, 45 parts of acrylamide, 53 parts of acryloyloxyethyltrimethylammonium chloride (DAC), 1.7 parts of methacryloyloxyethyldimethylamine, Add 0.6 parts of methacryloyloxyethyl dimethyl cetyl ammonium bromide monomer into a beaker, add distilled water to dissolve, so that the total mass content of the four types of monomers is 29wt%;

[0093] 2) Add 3.0% thiourea, 0.08% potassium formate, 0.05% disodium ethylenediamine tetracarboxylate, 5.0% dodecyl sulfonate to the above monomer aqueous solution (based on the total mass of the four monomers as 100%) sodium nitrate, 0.1% N,N-tetramethylethylenediamine, stir and dissolve evenly, put it in a 10°C water bath and cool for 30min, and cool the temperature to 10°C;

[0094] 3) Add a certain amount of sodium carbonate to the above solution to adjust the pH value of the solution to 9.5, continue to cool for 30 minutes, put it in a 10°C water bath to cool the te...

Embodiment 3

[0099] 1) Prepare an aqueous solution of polymerized monomers, in parts by mass, mix 40 parts of acrylamide, 58 parts of DAC, 1.5 parts of methacryloyloxyethyl dimethylamine, 0.5 parts of methacryloyloxyethyl dimethyl Add the hexaalkylammonium bromide monomer into the beaker, add distilled water to dissolve, so that the total mass content of the four types of monomers is 27wt%;

[0100] 2) Add 2.0% thiourea, 0.04% potassium formate, 0.03% disodium ethylenediaminetetraacetic acid, 4.0% dodecyl sulfonate to the above aqueous monomer solution (based on the total mass of the four monomers as 100%) Sodium bicarbonate, 0.08% N,N-tetramethylethylenediamine, stir and dissolve evenly, put it in a water bath at 8°C and cool for 30 minutes, and cool the temperature to 8°C;

[0101]3) Add a certain amount of sodium carbonate to the above solution to adjust the pH value of the solution to 10, continue to cool for 30 minutes, put it in an 8°C water bath to cool the temperature to 8°C, intro...

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Abstract

The invention provides a method for preparing a cross-linked acid. The method comprises the following steps: 1) adding an acid-resistant thickening agent into a hydrochloric acid solution at a first stirring speed, and stirring at a second stirring speed to obtain a first acid solution; 2) sequentially adding an iron ion stabilizer, a corrosion inhibitor and a demulsification cleanup additive intothe first acid solution, uniformly stirring at a third stirring speed, and standing to obtain a cross-linked acid base solution, and 3) adding a cross-linking agent into the cross-linked acid base solution, and uniformly stirring at a fourth stirring speed to obtain the cross-linked acid.

Description

technical field [0001] The present application provides a method for preparing cross-linked acid. Background technique [0002] The ground cross-linking acid refers to adding a thickener (or gelling agent) to the acid (such as hydrochloric acid) to increase the viscosity of the acid solution, and then adding a cross-linking agent to form an adjustable hanging jelly acid system, thereby reducing the transmission and diffusion of H+ rate, reduce fluid loss, prolong acid action distance, and improve the effect of acid fracturing. In recent years, the surface cross-linked acid technology has been continuously improved, and it has become an important acid system for acid fracturing of high-temperature carbonate reservoirs. The scope is limited, and the slow acid fracturing transformation effect is not good. Therefore, it is urgent to improve the resistance and retarding performance of the ground crosslinking acid system. Contents of the invention [0003] The invention provi...

Claims

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Application Information

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IPC IPC(8): C09K8/72C09K8/74
CPCC09K8/72C09K8/725C09K8/74
Inventor 贾文峰蒋廷学张旭东姚奕明刘建坤
Owner CHINA PETROLEUM & CHEM CORP
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