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Water-based fracturing fluid used for continental face shale gas fracturing and preparation method thereof

A continental shale, water-based technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of high cost and poor economic benefits, and achieve strong sterilization ability, good compatibility, surface interface low tension effect

Active Publication Date: 2014-06-11
RES INST OF SHAANXI YANCHANG PETROLEUM GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] According to the experience of developing marine shale gas in the United States, water-based gel fracturing fluid and foam fracturing fluid were initially used for large-scale fracturing stimulation, and good stimulation effects were obtained, but the final economic benefits were not good due to high costs , until 1997, the implementation of large-scale fracturing operations of this type of fracturing fluid system was stopped; after 1998, large-scale fracturing operations using slick water (also known as drag-reducing water) fracturing fluids were successfully carried out. Compared with large-scale gel fracturing The cost of slick water fracturing has dropped by more than 30%, making the exploitation of shale gas profitable. So far, slick water fracturing fluid has become the most commonly used fracturing fluid system for shale gas development in the United States

Method used

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preparation example Construction

[0039] The present invention also relates to a method for preparing a water-based fracturing fluid for continental shale gas fracturing, which specifically includes the following steps:

[0040] 1) Measure water according to the ratio of the water-based fracturing fluid formula for continental shale gas fracturing of the present invention;

[0041] 2) Add 0.02-0.1% mass percentage of high molecular polymer and stir for 40 minutes;

[0042] 3) Add 2-3% by mass of clay stabilizer and stir for 10-15 minutes; add 0.1-0.3% by mass of fungicide and 0.3-0.5% by mass of drainage aid in the stirring state, and stir for 15 minutes Fully dissolved.

Embodiment 1

[0044] Prepare 50m 3 Fracturing fluid, the preparation method is: take 48.79 m 3 Water, add 10 kg of anionic polyacrylamide with a molecular weight of 1000, stir for 40 minutes, then add 1 ton of potassium chloride while stirring, and the industrial grade potassium chloride requires K 2 O ≥ 62.0%, water insoluble content ≤ 2.0%, stir for 15 minutes to completely dissolve potassium chloride, then add 50 kg of glutaraldehyde and 150 kg of drainage aid in turn, stir for 15 minutes to fully dissolve and prepare the shale gas pressure Fracturing water-based fracturing fluid. The drainage aid is a mixed solution of alkyl polyglycoside and SR18Y fluorocarbon surfactant; the mixed solution includes alkyl polyglycoside, SR18Y, ethanol and water; wherein, the mass percentage of each component is: alkyl polyglycoside is 5%, SR18Y 4%, ethanol 10%, water 81%, the preparation method can be mixed directly.

Embodiment 2

[0046] Prepare 50m 3 Fracturing fluid, the preparation method is: take 48.77m 3 Water, add 20 kg of anionic polyacrylamide with a molecular weight of 1000, stir for 40 minutes, then add 1 ton of potassium chloride while stirring, stir for 15 minutes to completely dissolve potassium chloride, then add 50 kg of glutaraldehyde, 150 kg of Drainage aid, stir for 15 minutes to fully dissolve and prepare the water-based fracturing fluid for shale gas fracturing. The drainage aid is a mixed solution of alkyl polyglycoside and SR18Y fluorocarbon surfactant; the mixed solution includes alkyl polyglycoside, SR18Y, ethanol and water; wherein, the mass percentage of each component is: alkyl polyglycoside is 5%, SR18Y 4%, ethanol 10%, water 81%, the preparation method can be mixed directly.

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Abstract

The invention relates to a water-based fracturing fluid used for continental face shale gas fracturing and a preparation method thereof. The fracturing fluid comprises 0.02-0.1% of macromolecule polymer, 2-3% of clay stabilizer, 0.3-0.5% of discharge aiding agent, 0.1-0.3% of bactericide and the balance of water in mass percent. The preparation method of the fracturing fluid comprises the following steps of: 1) getting water in proportion in the formula of the fracturing fluid; 2) adding 0.02-0.1% of macromolecule polymer in mass percent, and stirring for 40 minutes; and 3) adding 2-3% of clay stabilizer in mass percent, and stirring for 10-15 minutes; and sequentially adding 0.1-0.3% of bactericide and 0.3-0.5% of discharge aiding agent in mass percent under a stirring condition, stirring for 15 minutes, and fully dissolving. The fracturing liquid provided by the invention can greatly reduce fracturing construction pump pressure and has the characteristics of low surface tension, good discharge aiding agent, strong clay stabilizing capability, strong sterilization capability and no precipitation or flocculate.

Description

technical field [0001] The invention relates to a water-based fracturing fluid for continental shale gas fracturing and a preparation method thereof. Background technique [0002] Shale gas is a kind of natural gas that occurs in interlayers of dark mudstone, high-carbon mudstone, shale and silty rocks. The reservoir lithology is tight, the permeability is extremely low, the gas saturation is low, and there is no natural productivity. Large-scale fracture network fracturing is required to obtain industrial gas flow, and shale gas development is in the exploratory stage in my country. [0003] According to the experience of developing marine shale gas in the United States, water-based gel fracturing fluid and foam fracturing fluid were initially used for large-scale fracturing stimulation, and good stimulation effects were obtained, but the final economic benefits were not good due to high costs , until 1997, the implementation of large-scale fracturing operations of this typ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/68
Inventor 王香增雷晓岚吴金桥申峰段玉秀郭庆张军涛高志亮朱容婷
Owner RES INST OF SHAANXI YANCHANG PETROLEUM GRP
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