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Acid gel fracturing fluid and preparation method thereof

A jelly fracturing fluid and acidic technology, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as formation damage, achieve a small amount of liquid entering the ground, a high liquid flowback rate, and improve production stimulation. effect of effect

Inactive Publication Date: 2012-02-15
西安长庆化工集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 3. The existing fracturing fluid system is generally alkaline, and alkaline substances are easy to form precipitation with high-valent metal ions in the formation, causing damage to the formation

Method used

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  • Acid gel fracturing fluid and preparation method thereof
  • Acid gel fracturing fluid and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Each material is proportioned by the following parts by weight:

[0037] 94.9 parts of water

[0038] Thickener CJ2-9 0.6 parts

[0039] 0.7 parts of organoaluminum crosslinking agent

[0040] Hydrocarbon emulsifier 1.00 parts

[0041] Ammonium chloride 0.80 parts.

[0042] After each material is proportioned according to the above parts by weight, it is realized through the following steps:

[0043] (1) Preparation of solution A: Add water to the container, and slowly add thickener CJ2-9, ammonium chloride and hydrocarbon emulsifier while circulating with a pump or agitator, and continue to circulate after adding Or stir for 30 minutes so that the liquid is fully mixed to form solution A.

[0044] (2) During fracturing construction, while pumping solution A, mix solution A and organoaluminum crosslinking agent according to the volume ratio of solution A: organoaluminum crosslinking agent = 100:0.7 to form fracturing fluid . the

Embodiment 2

[0046] Each material is proportioned by the following parts by weight:

[0047] 95.9 parts of water

[0048] Thickener CJ2-9 0.75 parts

[0049] Organoaluminum crosslinking agent 0.85 parts

[0050] 1.5 parts of alkyl sulfonate emulsifier

[0051] Ammonium chloride 1 part.

[0052] After each material is proportioned according to the above parts by weight, it is realized through the following steps:

[0053] (1) Preparation of solution A: Add water to the container, and slowly add thickener CJ2-9, ammonium chloride and alkyl sulfonate emulsifier while stirring with a pump or stirrer, add Continue to circulate or stir for 30 minutes after completion, so that the liquid is fully mixed to form solution A.

[0054] (2) During fracturing construction, while pumping solution A, mix solution A and organoaluminum crosslinking agent according to the volume ratio of solution A: organoaluminum crosslinking agent = 100:0.85 to form fracturing fluid . the

Embodiment 3

[0056] Each material is proportioned by the following parts by weight:

[0057] 96.9 parts of water

[0058] Thickener CJ2-9 0.9 parts

[0059] 1.0 parts of organoaluminum crosslinking agent

[0060] Alkyl sulfate emulsifier 2.0 parts

[0061] Ammonium chloride 1.2 parts.

[0062] After each material is proportioned according to the above parts by weight, it is realized through the following steps:

[0063] (1) Preparation of solution A: Add water to the container, and slowly add thickener CJ2-9, ammonium chloride and alkyl sulfate emulsifier under the condition of circulating with a pump or agitator, and finish adding Then continue to circulate or stir for 30 minutes, so that the liquid is fully mixed to form solution A.

[0064] (2) During fracturing construction, while pumping solution A, mix solution A and organoaluminum crosslinking agent according to the volume ratio of solution A: organoaluminum crosslinking agent = 100:1.0 to form fracturing fluid . the...

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Abstract

The invention relates to an acid gel fracturing fluid and a preparation method thereof. At present, most of fracturing fluids used in the fracturing reformation of oil and gas fields are fracturing fluids in which guar gum and a derivative of the guar gum are taken as thickening agents and an organic substance or an inorganic substance of boron is taken as a crosslinking agent, the conventional fracturing fluid systems are usually alkaline, and alkaline substances and high-valence metal ions of stratums can form precipitates easily which can damage the stratums. The acid gel fracturing fluid consists of 94.9 to 96.9 weight parts of water, 0.6 to 0.9 weight part of thickening agent CJ2-9, 0.7 to 1.0 weight part of JL-9 crosslinking agent, 1.00 to 2.0 weight parts of surfactant and 0.80 to 1.2 weight parts of ammonium chloride. During fracturing construction, when a prepared solution A is pumped, the solution A and the JL-9 crosslinking agent are mixed in a volume ratio of (100:0.7)-(1000:1.0) to form the fracturing fluid. The acid water-based fracturing fluid in which modified guar gum is taken as a thickening agent has the advantages that: the content of gel breaking residue of the system is low, the amount of a liquid entering the ground is small, the flowback rate of the liquid is high, and the yield increasing retrofit effect is improved.

Description

Technical field [0001] The present invention involves an acid -free frozen gel fracture fluid and preparation methods used in the production process of air well fracture production. technical background [0002] At present, most of the fracture liquid used in the fracture of oil and gas fields is mostly Guer glue and its derivatives (such as hydroxylvidial gum) as a thick agent, boron organic matter or inorganic objectsFractive liquids generally exist in the following disadvantages: [0003] 1. Compared with the hydroxyl, carboxymethylker glue fracture system, the original residual content of the original hydroxydal, carboxyrian cigarette gel fracture system is high; [0004] 2. Compared with the Gwell gum fracturing liquid system, the split liquid residue is relatively high, generally 500-600mg / L; [0005] 3. The existing fracture liquid system is generally alkaline, and alkaline substances are easy to precipitate with high -priced metal ions of the strata, causing damage to the...

Claims

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Application Information

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IPC IPC(8): C09K8/68
Inventor 杜彪谢璇杨海燕陆红军丁里万华邓卫珍沈燕鸿赵燕红吕俊华李鹏薛小佳吴江吕海燕石华强
Owner 西安长庆化工集团有限公司
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