Acid liquid for acid fracturing and preparation method thereof

A technology of acid liquid and acid fracturing, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of complex process, high cost, high toxicity, etc., and achieve the effect of simple process, good elasticity, and low toxicity

Active Publication Date: 2012-05-02
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Generally speaking, the crosslinking agents in the prior art include chromium, aldehyde, zirconium, etc., but chromium salts and aldehydes are highly toxic, and zirconium salts are generally prepared by reacting zirconium oxychloride with organic matter, and the process is more complicated and costly. higher

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The acid solution is calculated by weight fraction, and each component is as follows:

[0027] Concentrated hydrochloric acid 55.56wt% (equivalent to pure acid is 20wt%), polyacrylamide (hydrolysis degree 5%, molecular weight 10 million) 0.6wt%, zirconium oxychloride 0.5wt%, hexamethylenetetramine 0.2wt%, meta Hydroquinone 0.2wt%, balance is water.

[0028] Its preparation method is: add 42.94 parts of water, 55.56 parts of concentrated hydrochloric acid and 0.6 parts of polyacrylamide in order by weight, stir well and then add 0.5 parts of zirconium oxychloride, 0.2 parts of hexamethylenetetramine, 0.2 parts of m-phenylene phenol.

[0029] The resulting acid gel is cross-linked at 140°C for 3 minutes. After cross-linking, it can be -1 The viscosity is 95mPa.s under the condition; it will not be dehydrated or decomposed when placed at 150°C for 1 hour.

Embodiment 2

[0031] As described in Example 1, the difference is: the mass percentage of hexamethylenetetramine is 0.1 wt%, that is, 0.1 parts by weight of hexamethylenetetramine and 43.04 parts by weight of water are added.

[0032] The cross-linking time of the obtained acid solution is 5 minutes, and the obtained acid solution gel can be adjusted and hung at 150°C and 170S -1 The viscosity under the condition is 80mPa.s; it will not be dehydrated or broken at 150°C for 1 hour.

Embodiment 3

[0034] As described in Example 1, the difference is that the mass percentage of zirconium oxychloride is 1 wt%, that is, 1 weight part of zirconium oxychloride and 42.44 weight parts of water are added.

[0035] The cross-linking time of the obtained acid liquid gel is 1min, and the obtained acid liquid gel can be adjusted and hung. -1 The viscosity under the condition is 70mPa.s; it will not be dehydrated or decomposed when placed at 150°C for 1 hour.

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Abstract

The invention relates to acid liquid for acid fracturing and a preparation method thereof. The acid liquid for acid fracturing consists of the following substances: 5-40 weight percent of acid, 0.3-2.0 weight percent of polyacrylamide polymer, 0.03-1.5 weight percent of zirconium oxychloride, 0.03-1.5 weight percent of aldehyde cross-linking agent, 0.03-1.5 weight percent of phenol cross-linking agent and remaining weight percent of water, wherein the aldehyde cross-linking agent is at least one of aldehyde compounds and derivatives thereof, and the phenol cross-linking agent is at least one of phenol compounds and derivatives thereof. The acid liquid provided by the invention has the advantages of high viscosity, high adjustability, high elasticity and high temperature resistance after cross-linking, thereof the goals of acid liquid deep penetration and acid fracturing slot creation can be achieved, the cost is reduced, the harm to human bodies and the environmental pollution during construction are reduced and the acid fracturing reconstruction effect can be effectively improved.

Description

technical field [0001] The invention relates to an acid liquid in the technical field of oil field chemistry, in particular to an acid liquid used for acid fracturing stimulation measures for low-permeability reservoirs. Background technique [0002] Acid fracturing is one of the important measures for improving production of low-permeability reservoirs. With the in-depth development of low-permeability reservoirs in my country, acid fracturing has been more and more widely used. [0003] The performance of the acid fluid plays a key role in the effect of acid fracturing. In order to obtain a better acid fracturing effect, the acid fracturing fluid has the following requirements: increase the penetration of acid, delay the reaction speed of acid rock, and increase the action distance of acid fluid , to maximize acid-etched fractures to obtain high conductivity fractures close to hydraulic fracturing techniques. [0004] The acid liquid commonly used in acid fracturing mainl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/76C09K8/74
Inventor 赵晓张保平张旭东姚奕明李洪春王宝峰秦钰铭张旭
Owner CHINA PETROLEUM & CHEM CORP
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