High performance acidizing fracturing fluid and preparation method thereof

A technology of acid fracturing and acid fluid, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of fast filtration rate, large hydraulic loss, small penetration depth, etc., and achieve good high temperature resistance, The effect of small filtration loss and strong buoyancy

Inactive Publication Date: 2014-04-30
CHANGZHOU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, conventional acid solutions have many disadvantages, such as small penetration depth, fast filtration rate, large hydraulic loss, etc.
In addition, conventional acid fluid may also cause severe pitting in the area around the wellbore, causing formation plugging and affecting oil and gas production
So acidification often fails to achieve its purpose

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Firstly, an acid solution is prepared. The mixed acid solution is formed by mixing 15% hydrochloric acid, 3% hydrofluoric acid, and 5% acetic acid. The mass ratio of hydrochloric acid, hydrofluoric acid and acetic acid is 5:2:3.

[0021] Next, a thickener is prepared, which is composed of 0.3% N-vinyl lactam, 0.3% ethoxylated fatty amine and 0.3% carboxymethyl hydroxypropyl guar gum.

[0022] Then the additives are prepared, and the mass fraction (calculated as additives) is 0.5% anti-swelling agent, 1% corrosion inhibitor, 0.3% iron ion stabilizer and 0.2% drainage aid to form additives.

[0023] Under stirring conditions, the acid liquid with a mass ratio of 5:3:2, the thickening agent, and the additives are fully mixed to form an acidified fracturing fluid and thickened acid liquid is added.

[0024] Anti-swelling agent adopts quaternary ammonium salt surfactant; corrosion inhibitor adopts pickling corrosion inhibitor; iron ion stabilizer adopts iron ion stabilizer for acidif...

Embodiment 2

[0028] Firstly, an acid solution is prepared. The mixed acid solution is formed by mixing 15% hydrochloric acid, 3% hydrofluoric acid, and 5% acetic acid. The mass ratio of hydrochloric acid, hydrofluoric acid and acetic acid is 5:2:3.

[0029] Next, a thickener is prepared, which is composed of 1.5% N-vinyl lactam, 1.5% ethoxylated fatty amine and 1.5% carboxymethyl hydroxypropyl guar gum.

[0030] Then the additives are prepared, and the mass fraction (based on the additives) is 1% anti-swelling agent, 1.5% corrosion inhibitor, 1% iron ion stabilizer and 0.6% drainage aid to form the additive.

[0031] Under stirring conditions, the acid liquid with a mass ratio of 5:3:2, the thickening agent, and the additives are fully mixed to form an acidified fracturing fluid and thickened acid liquid is added.

[0032] Anti-swelling agent adopts quaternary ammonium salt surfactant; corrosion inhibitor adopts pickling corrosion inhibitor; iron ion stabilizer adopts iron ion stabilizer for acidif...

Embodiment 3

[0036] Firstly, an acid solution is prepared. The mixed acid solution is formed by mixing 15% hydrochloric acid, 3% hydrofluoric acid, and 5% acetic acid. The mass ratio of hydrochloric acid, hydrofluoric acid and acetic acid is 5:2:3.

[0037] Next, a thickener is prepared, which is composed of 3% N-vinyl lactam, 3% ethoxylated fatty amine and 3% carboxymethyl hydroxypropyl guar gum.

[0038] Then prepare additives, mix 2% anti-swelling agent, 2% corrosion inhibitor, 1.5% iron ion stabilizer and 1% drainage aid with mass fraction (based on additives) to form additives.

[0039] Under stirring conditions, the acid liquid with a mass ratio of 5:3:2, the thickening agent, and the additives are fully mixed to form an acidified fracturing fluid and thickened acid liquid is added.

[0040] Anti-swelling agent adopts quaternary ammonium salt surfactant; corrosion inhibitor adopts pickling corrosion inhibitor; iron ion stabilizer adopts iron ion stabilizer for acidification; discharge aid ado...

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Abstract

The invention relates to an acidizing fracturing fluid added thickening acid liquid and a preparation method thereof. The thickening acid liquid provided by the invention is composed of an acid liquor, a thickening agent and additives in a mass ratio of 5:3:2. Specifically, the acid liquor is formed by mixing of hydrochloric acid, hydrofluoric acid and acetic acid. The thickening agent is formed by compounding of N-vinyl lactam, ethoxylated fatty amine and carboxymethyl hydroxypropyl guar gum. The additives mainly include an antiswelling agent, a corrosion inhibitor, a ferric ion stabilizer and a discharge aiding agent. The thickening acid liquid provided by the invention has the advantages of good high temperature resistance and shear resistance, etc. The thickening acid liquid provided by the invention can be added into a water-based fracturing fluid, a foam fracturing fluid or a mixture of the two to undergo crosslinking through a cross-linking agent so as to form the compound acidizing fracturing fluid. The obtained compound acidizing fracturing fluid integrates acidizing and fracturing, so that the diapiric fracturing fluid can form a multi-component foam system and release heat and gas, thus achieving the triple functions of acidizing, fracturing and foaming.

Description

Technical field [0001] The invention relates to an acidified fracturing fluid adding thickened acid fluid and a preparation method thereof. Background technique [0002] At present, the development and transformation of low-permeability and low-pressure oilfields in various domestic oilfields adopt fracturing acidification technology. With the development of oil and gas exploration and development, the application range of fracturing and acidification technology has expanded from carbonate formations to sandstone and siliceous formations. The process fluid has developed from completion pickling to remove plugging and bedrock acidification to hydraulic fracturing. Organically combined. [0003] However, conventional acid liquid has many shortcomings, such as small penetration depth, fast fluid loss, and large hydraulic loss. In addition, conventional acid may also cause severe pitting in the area around the wellbore, causing blockage of the formation and affecting oil and gas prod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68C09K8/74C09K8/70
CPCC09K8/74C09K8/725C09K8/90C09K2208/12C09K2208/32
Inventor 王树立李建敏周诗岽金雪松周莲王蕾
Owner CHANGZHOU UNIV
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