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Non-damage self-diverting acid and preparation method and application

A self-steering acid and hydrochloric acid technology, applied in chemical instruments and methods, earth-moving drilling, mining fluids, etc., can solve problems such as damage to the formation, and achieve the effects of easy dispersion, good fluidity, and convenient construction and application.

Active Publication Date: 2014-05-28
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem that the existing viscoelastic surfactant self-steering acid generates carboxylate precipitation in the formation and damages the formation, the present invention provides a non-harmful self-steering acid and its preparation method and application. The surface in the self-steering acid Active agent does not form precipitates during formation acidification

Method used

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  • Non-damage self-diverting acid and preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] [Example 1] Synthesis of 2-hydroxyl-3-(N,N-dimethyl-N-oleic acid amidopropyl) sodium propanesulfonate

[0056] In the synthesis kettle, add 460Kg oleic acid, then add 183Kg N,N-dimethylpropylenediamine, stir while adding, after the addition, heat up to 150°C±5°C, reflux for about 6hr, and take samples regularly during the reaction , Measure the amine value of the mixture with hydrochloric acid standard solution. When the amine value of the reactant no longer changes, cool down to 60°C, add 20Kg of ethanol, and stir evenly. Add 450Kg of sodium 2-hydroxy-3-chloropropanesulfonate, adjust the pH value of the reactant to 7-8 with 20wt% NaOH aqueous solution, raise the temperature to 80°C±5°C, and reflux for 5hr to obtain 2-hydroxyl-3-( Sodium N,N-dimethyl-N-oleic acid amidopropyl)propanesulfonate.

Embodiment 2

[0057] [Example 2] Synthesis of 2-hydroxyl-3-(N,N-dimethyl-N-sinapic acid amidopropyl)propanesulfonate

[0058] In the synthesis kettle, add 440Kg sinapinic acid, then add 183Kg N,N-dimethylpropylenediamine, stir while adding, heat up to 160°C±5°C after adding, reflux for about 6hr, and take samples regularly during the reaction , Measure the amine value of the mixture with hydrochloric acid standard solution. When the amine value of the reactant no longer changes, cool down to 60°C, add 20Kg of ethanol, and stir evenly. Add 450Kg of sodium 2-hydroxy-3-chloropropanesulfonate, adjust the pH value of the reactant between 7-8 with 20% NaOH aqueous solution, raise the temperature to 80°C±5°C, and reflux for 5 hours to obtain the product 2-hydroxy- Sodium 3-(N,N-Dimethyl-N-sinapinamidopropyl)propanesulfonate.

Embodiment 3

[0059] [Example 3] Synthesis of 2-hydroxyl-3-(N,N-dimethyl-N-stearic acid amidopropyl) sodium propanesulfonate

[0060] In the synthesis kettle, add 460Kg stearic acid, then add 183Kg N,N-dimethylpropylenediamine, stir while adding, after the addition, heat up to 160°C±5°C, reflux reaction for about 6hr, during the reaction process Take a sample, measure the amine value of the mixture with hydrochloric acid standard solution, when the amine value of the reactant no longer changes, lower the temperature to 60°C, add 20Kg of ethanol, and stir evenly. Add 450Kg of sodium 2-hydroxy-3-chloropropanesulfonate, adjust the pH value of the reactant between 7-8 with 20% NaOH aqueous solution, raise the temperature to 80°C±5°C, and reflux for 5 hours to obtain the product 2-hydroxy- Sodium 3-(N,N-Dimethyl-N-stearamidopropyl)propanesulfonate.

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Abstract

The invention relates to a non-damage self-diverting acid and its preparation method and an application thereof. Components of the self-diverting acid contain 3-10% of a hydroxyl sulfonate ampholytic surfactant, 1-5% of a polybasic carboxylic acid chelating agent,?10-28% of acid and the balance water. The preparation method comprises the following steps: uniformly mixing acid and water, adding the hydroxyl sulfonate ampholytic surfactant and the polybasic carboxylic acid chelating agent and uniformly mixing. The non-damage self-diverting acid provided by the invention is used in acidification, acid fracturing and production increasing of carbonate reservoir and sandstone reservoir. The self-diverting acid is not easy to generate insoluble calcium and magnesium salts, is harmless to stratum, has good product liquidity, and is convenient to construct.

Description

technical field [0001] The invention relates to a preparation method and application of a harmless self-steering acid for acid fracturing, and belongs to the technical field of surfactant self-steering acid for acidification and acid fracturing improvement of reservoir formations. Background technique [0002] When matrix acidizing the reservoir, due to the low resistance of the high-permeability layer, under the same pressure system, the acid liquid first enters the high-permeability layer, and only a small amount enters the medium-permeability reservoir, while for the low-permeability and serious pollution It is difficult for the acid liquid to enter the interval reservoir. The purpose of acidizing acid fracturing with acid matrix is ​​to require the acid solution to completely transform the reservoir, especially for the low-permeability and heavily polluted interval reservoirs. Therefore, in order to realize the efficient transformation of all heterogeneous reservoirs by...

Claims

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Application Information

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IPC IPC(8): C09K8/74
CPCC09K8/602C09K8/74E21B43/26
Inventor 王彦玲徐超王增宝金家锋
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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