Preparation method of densifier for diverting acid

A thickening agent, diverting acid technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of acid liquid consumption, secondary formation damage construction cost, etc., and achieve low residual acid viscosity and viscosity-temperature performance. Stable, lengthening effect

Inactive Publication Date: 2012-12-12
扬州润达油田化学剂有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When performing matrix acidizing or acid fracturing on reservoirs containing carbonate rocks, conventional acid, gelled acid, emulsified acid, foam acid and other acid fluids are mainly used; The permeable micro-cracks and pores cause the acid fluid to be lost and quickly consumed. In order to control the acid fluid loss when the matrix is ​​acidified, various diverting agen

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0011] First add 13% pure water, 30% N-alkyl-N and 30% N-bis(2-hydroxyethyl)octadecane to the container and stir evenly at 70°C to 75°C, then add Stir 37% ethyl bromide for 10 minutes, then add 20% butanol, then seal the instrument and open the condensation reflux reaction for 6.0 to 6.5 hours to get the thickener product for turning acid.

[0012] Then take a certain quality of the above-mentioned thickener for steering acid, stir evenly with clear water, then add a certain amount of hydrochloric acid, and the thickener content of being made into is 5%, and the concentration of hydrochloric acid is 25% steering acid. The specific proportions are as follows (measured according to 100g of steering acid): thickener: 5g; hydrochloric acid (37%): 67g; water: 28g.

example 2

[0014] First add 13% pure water, 30% N-alkyl-N and 30% N-bis(2-hydroxyethyl)octadecane to the container and stir evenly at 70°C to 75°C, then add Stir 37% ethyl bromide for 10 minutes, then add 20% butanol, then seal the instrument and open the condensing reflux reaction for 6.0 to 6.5 hours to get the thickener product for turning acid.

[0015] Then take a certain amount of the above-mentioned thickener for steering acid, stir it evenly with clear water, then add a certain amount of hydrochloric acid, and then add a certain amount of sodium salicylate, the content of the thickener is 5%, salicylic acid Steering acid with a sodium content of 1% and a hydrochloric acid concentration of 25%. The specific proportions are as follows (measured according to 100g of steering acid): thickener: 5g; hydrochloric acid (37%): 67g; sodium salicylate: 1g; water: 27g.

example 3

[0017] First add 13% pure water, 30% N-alkyl-N and 30% N-bis(2-hydroxyethyl)octadecane to the container and stir evenly at 70°C to 75°C, then add Stir 37% ethyl bromide for 10 minutes, then add 20% butanol, then seal the instrument and open the condensation reflux reaction for 6.0 to 6.5 hours to get the thickener product for turning acid.

[0018] Then take a certain quality of the above-mentioned thickener for steering acid, stir evenly with clear water, then add a certain amount of hydrochloric acid, and the thickener content of being made into is 5%, and the concentration of hydrochloric acid is 20% of steering acid. The specific proportions are as follows (measured according to 100g of steering acid): thickener: 5g; hydrochloric acid (37%): 54g; water: 41g.

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PUM

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Abstract

Disclosed is a preparation method of a densifier for diverting acid. According to the preparation method, butanol, bromoethane, N-alkyl-N, N-bis(2-hydroxyethyl)octodecane and purified water are mixed according to a certain proportion and undergo a heating reaction at a certain temperature for 6 hours so as to obtain the densifier for diverting acid. The process is simple and easy to control. The product obtained is stable. In addition, the product has good acidification and visco-elastic properties.

Description

technical field [0001] The invention relates to the field of quaternization synthesis, in particular to a preparation method of a thickener for steering acid. [0002] technical background [0003] When performing matrix acidizing or acid fracturing on carbonate-bearing reservoirs, conventional acid, gelled acid, emulsified acid, foam acid and other acid fluids are mainly used; The permeable micro-cracks and pores cause the acid fluid to be lost and quickly consumed. In order to control the acid fluid loss when the matrix is ​​acidified, various diversion agents are generally used. It has gone through three stages: adding solid fluid loss reducer to the acid solution; acid fracturing of high-viscosity pre-fluid; multi-stage injection of pre-fluid acid fracturing; but the above-mentioned fluid loss control technology will cause secondary damage to the formation or construction The cost is too high, and the cracks are plugged at one time. Contents of the invention [0004...

Claims

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Application Information

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IPC IPC(8): C09K8/76
Inventor 曲韵滔
Owner 扬州润达油田化学剂有限公司
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