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Cross-linked emulsified acid, preparation method and applications thereof

A technology of emulsified acid and cross-linked acid, which is applied in the fields of chemical instruments and methods, earthwork drilling, mining fluids, etc., can solve problems such as limited range of communication reservoirs, poor effect of acid fracturing, difficulty in meeting high-temperature reservoirs, etc. Achieve the effects of improving acidizing and acid fracturing effects, good acid fracturing/acidizing effects, and prolonging the etching distance

Inactive 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

But the temperature resistance is 120°C
Difficult to meet the needs of high temperature reservoirs
[0004] At present, the maximum temperature resistance of the ground cross-linked acid system used in the field is 160°C. Although it can meet the application of acid fracturing in high-temperature reservoirs, there are problems such as short acid-etched fractures, limited range of communication reservoirs, and poor acid fracturing effects.

Method used

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  • Cross-linked emulsified acid, preparation method and applications thereof
  • Cross-linked emulsified acid, preparation method and applications thereof
  • Cross-linked emulsified acid, preparation method and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] 1) Prepare the cross-linked acid base solution according to the following components by weight: Take 100 parts of hydrochloric acid solution (concentration: 15% wt), slowly add 0.6 parts of polyacrylamide thickener SRAP for acid at 500r / min -1 (produced by Sinopec Petroleum Engineering Technology Research Institute, SRAP-1), stirred for half an hour to form a uniform solution, then added 1.2 parts of iron ion stabilizer (ethylenediaminetetraacetic acid, Tianjin Guangfu Chemical Reagent Factory), 2.0 1-part of 1-aminoethyl-2-pentadecyl imidazoline quaternary ammonium salt (commercially available) and 2.5 parts of sorbitan fatty acid ester polyoxyethylene ether (commercially available) emulsifier are stirred evenly, sealed at room temperature Leave it for 4 hours;

[0049] 2) Prepare the emulsion according to the following components by volume: under the condition of a stirring speed of 500r / min, slowly add white oil dropwise to the cross-linked acid base liquid prepared ...

Embodiment 2

[0052] 1) Prepare the cross-linked acid base solution according to the following components by weight: take 100 parts of hydrochloric acid solution (concentration: 20% wt), slowly add 0.7 parts of polyacrylamide thickener SRAP for acid at 500r / min -1 (produced by Sinopec Petroleum Engineering Technology Research Institute, SRAP-1), stirred for half an hour to form a uniform solution, then added 1.5 parts of iron ion stabilizer citric acid (commercially available), 3.0 parts of 1-aminoethyl -2-Pentadecyl imidazoline quaternary ammonium salt (commercially available) and 3.0 parts of polyoxyethylene polyoxyethylene octylphenol ether-10 (commercially available) emulsifier were stirred evenly, and sealed at room temperature for 5 hours;

[0053] 2) Prepare the emulsion according to the following components by volume: under the condition of a stirring speed of 800r / min, slowly add white oil dropwise to the cross-linked acid base liquid prepared in , and the volume ratio of the two ph...

Embodiment 3

[0056] 1) Prepare the cross-linked acid base solution according to the following components by weight: Take 100 parts of hydrochloric acid solution (concentration: 25% wt), slowly add 0.8 parts of polyacrylamide thickener SRAP for acid at 500r / min -1 (produced by Sinopec Petroleum Engineering Technology Research Institute, SRAP-1), stirred for half an hour to form a uniform solution, then added 1.5 parts of iron ion stabilizer acetic acid (commercially available), 3.5 parts of Mannich base buffer Etching agent (commercially available) and 3.0 parts of polyoxyethylene polyoxyethylene octylphenol ether-10 and cetyltrimethylammonium bromide mixture (mass ratio 1:1) (commercially available) emulsifier are stirred evenly, Sealed and placed at room temperature for 5 hours;

[0057] 2) Prepare the emulsion according to the following components by volume: under the condition of a stirring speed of 1000r / min, slowly add white oil dropwise to the cross-linked acid base liquid prepared i...

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Abstract

The invention discloses a cross-linked emulsified acid, a preparation method and applications thereof. The cross-linked emulsified acid comprises a cross-linked acid base solution, an oil phase and across-linking agent, wherein based on the total volume of the cross-linking acid base solution and the oil phase of 100 parts, the cross-linking agent is 0.6-1.5 parts, the oil phase is one or a combination of diesel oil, kerosene, white oil and light crude oil, and the cross-linking agent is an organic zirconium cross-linking agent, an organic aluminum cross-linking agent or an organic titanium cross-linking agent. The preparation method comprises the following steps: slowly adding the oil phase into the cross-linked acid base solution according to the dosage, continuously stirring to uniformly mix the oil phase and the cross-linked acid base solution to form a uniform emulsion, and adding the cross-linking agent to obtain the cross-linked emulsified acid. Compared with the conventional ground cross-linked acid system, the cross-linked emulsified acid of the invention has the characteristics of good retarding performance, stability, temperature resistance and the like, and has a goodacid fracturing / acidifying effect after being injected into a stratum.

Description

technical field [0001] The invention relates to the field of acid fracturing stimulation of carbonate rock reservoirs, in particular to a cross-linked emulsified acid, a preparation method and an application. Background technique [0002] Ground cross-linked acid is the most commonly used retarded acid system for low-permeability, fracture-vuggy and fractured carbonate reservoirs and acid fracturing. 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 H + Transfer diffusion rate, reduce fluid filtration loss, prolong the action distance of acid liquid, and improve the effect of acid fracturing. In recent years, ground crosslinking acid technology has been continuously improved, [0003] Chinese patent CN104194767A discloses a high-temperature emulsified a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/72C09K8/74E21B43/27
CPCC09K8/72C09K8/725C09K8/74E21B43/26
Inventor 贾文峰蒋廷学张旭东姚奕明黄静周珺
Owner CHINA PETROLEUM & CHEM CORP
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