Clean fracturing fluid and preparation method thereof

A technology of cleaning fracturing fluid and fracturing fluid, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of reducing fracturing, formation and filling layer plugging permeability, decline, etc., and achieves little formation damage , strong sand-carrying ability and simple preparation method

Inactive Publication Date: 2016-04-20
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the commonly used fracturing fluids at home and abroad are mainly water-based fracturing fluids with natural vegetable gum, cellulose and synthetic polymers as thickeners, but water-based fracturing fluids thickened or cross-linked by polymers have Residue, these residues will inevitably cause serious blockage to the formation and filling layer, greatly reducing the permeability, thus greatly reducing the effect of fracturing

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Take by weighing octadecyltrimethylammonium chloride 16.0g, 2.0g lauryl dimethyl amine oxide betaine, join in 370g water, fully mix to obtain uniform transparent liquid, then add 4.0g sodium salicylate and 8.0g of potassium chloride, stirred evenly to obtain a clean fracturing fluid product. The fracturing fluid performance of the present embodiment is detected, and the performance is as follows:

[0014] Table 1 Example 1 obtained fracturing fluid performance test results

[0015] serial number project result 1 Exterior colorless viscous liquid 2 pH value 8.0 3 Base fluid apparent viscosity (mPas, 170 s -1 ) 420 4 High temperature shear viscosity (mPas, 170 s -1 , 80°C) 210 5 Sand carrying sedimentation rate (mm / min, 80°C) 6.60 6 Viscosity after gel breaking (mPas, 170 s -1 ) 3.0 7 Residue (mg / L) 0 8 Surface tension of gel breaking fluid (mN / m) 24.6

Embodiment 2

[0017] Take cetyltrimethylammonium bromide 12.0g, 4.0g tetradecyldimethylamine oxide betaine, join in 376g water, fully mix to obtain uniform transparent liquid, then add 4.0g sodium salicylate and 4.0g of potassium chloride, stirred evenly to obtain a clean fracturing fluid product. The fracturing fluid performance of the present embodiment is detected, and the performance is as follows:

[0018] Table 2 Example 2 obtained fracturing fluid performance test results

[0019] serial number project result 1 Exterior colorless viscous liquid 2 pH value 8.0 3 Base fluid apparent viscosity (mPas, 170 s -1 ) 290 4 High temperature shear viscosity (mPas, 170 s -1 , 80°C) 130 5 Sand carrying sedimentation rate (mm / min, 80°C) 12.30 6 Viscosity after gel breaking (mPas, 170 s -1 ) 3.0 7 Residue (mg / L) 0 8 Surface tension of gel breaking fluid (mN / m) 24.1

Embodiment 3

[0021] Take by weighing octadecyltrimethylammonium chloride 12.0g, 6.0g octadecyldimethylamine oxide betaine, join in 372g water, fully mix to obtain uniform transparent liquid, then add 4.0g sodium benzoate and 8.0g of sodium chloride, stirred evenly to obtain a clean fracturing fluid product. The fracturing fluid performance of the present embodiment is detected, and the performance is as follows:

[0022] Table 3 Example 32 obtained fracturing fluid performance test results

[0023] serial number project result 1 Exterior colorless viscous liquid 2 pH value 8.0 3 Base fluid apparent viscosity (mPas, 170 s -1 ) 330 4 High temperature shear viscosity (mPas, 170 s -1 , 80°C) 140 5 Sand carrying sedimentation rate (mm / min, 80°C) 10.90 6 Viscosity after gel breaking (mPas, 170 s -1 ) 3.0 7 Residue (mg / L) 0 8 Surface tension of gel breaking fluid (mN / m) 23.7

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Abstract

The present invention discloses a clean fracturing fluid system and a preparation method thereof, wherein the fracturing fluid system comprises, by mass, 3-6% of a cationic surfactant, 1-4% of a zwitterionic surfactant, 0.5-1.5% of counter ion, 2-5% of an electrolyte, and the balance of water. The clean fracturing fluid preparation method comprises: mixing a cationic surfactant, a zwitterionic surfactant and water to obtain a uniform transparent liquid, adding an aqueous solution of an electrolyte salt and counter ion to the uniform transparent liquid under stirring, and uniformly mixing to obtain the clean fracturing fluid. According to the present invention, the method has characteristics of simpleness and convenient operation, and the clean fracturing fluid system has characteristics of good viscoelasticity, strong sand-carrying ability, no residue, automatic gel breaking with water or oil, easy flowback, and low damage on stratum.

Description

technical field [0001] The invention relates to a preparation method of clean fracturing fluid. The clean fracturing fluid prepared by the invention is suitable for exploration and development of conventional and unconventional oil and gas resources. Background technique [0002] Hydraulic fracturing, as a stimulation measure for oil and gas reservoirs, has been used for nearly 50 years. It uses high displacement and pressure to inject non-Newtonian high-viscosity fracturing fluid containing high-concentration proppant downhole to achieve the purpose Create cracks in layers and extend the cracks. At present, the commonly used fracturing fluids at home and abroad are mainly water-based fracturing fluids with natural vegetable gum, cellulose and synthetic polymers as thickeners, but water-based fracturing fluids thickened or cross-linked by polymers have Residue, these residues will inevitably cause serious blockage to the formation and filling layer, greatly reducing the per...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68
Inventor 王康袁俊秀徐冬梅封心领
Owner CHINA PETROLEUM & CHEM CORP
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