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Novel cleaning fracturing fluid system 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 problems such as reservoir damage, and achieve the effects of small formation damage, strong sand-carrying ability, and convenient operation

Active Publication Date: 2016-03-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of exploration and development of oil and gas reservoirs, some low-permeability reservoirs are often found. Using guar gum and other polymer fracturing fluid systems for fracturing of such reservoirs will not only leave Some residues will also cause the expansion, dispersion and migration of clay minerals in the formation, causing greater damage to the reservoir

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Weigh 24.0g of octadecyltrimethylammonium chloride, 8.0g of cocamidopropyl betaine, add to 356g of water, fully mix to obtain a uniform transparent liquid, then add 4.0g of sodium salicylate and 8.0g of chlorine Calcium and stir evenly to obtain a clean fracturing fluid product. The fracturing fluid performance of the present embodiment is detected, and the performance is as follows:

[0015] Table 1 Example 1 obtained fracturing fluid performance test results

[0016] serial number project result 1 Exterior colorless viscous liquid 2 pH value 7.5 3 Base fluid apparent viscosity (mPas, 170 s -1 ) 459 4 High temperature shear viscosity (mPas, 170 s -1 , 80°C) 207 5 Sand-carrying sedimentation rate (mm / min, 80°C) 6.90 6 Viscosity after gel breaking (mPas, 170 s -1 ) 4.5 7 Residue (mg / L) 0 8 Surface tension of gel breaking fluid (mN / m) 26.7

Embodiment 2

[0018] Weigh 12.0g of cetyltrimethylammonium bromide, 16.0g of lauryl amidopropyl betaine, add to 356g of water, mix well to obtain a uniform transparent liquid, then add 4.0g of sodium salicylate and 12.0g of chloride Potassium, stir evenly to obtain a clean fracturing fluid product. The fracturing fluid performance of the present embodiment is detected, and the performance is as follows:

[0019] Table 2 Example 2 obtained fracturing fluid performance test results

[0020] serial number project result 1 Exterior colorless viscous liquid 2 pH value 8.0 3 Base fluid apparent viscosity (mPas, 170 s -1 ) 312 4 High temperature shear viscosity (mPas, 170 s -1 , 80°C) 165 5 Sand-carrying sedimentation rate (mm / min, 80°C) 8.30 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) 27.5

Embodiment 3

[0022] Take by weighing 16.0g of octadecyltrimethylammonium chloride, 8.0g of octadecylamidopropyl betaine, add to 352g of water, fully mix to obtain a uniform transparent liquid, then add 8.0g of sodium benzoate and 16.0g of chlorine sodium chloride, and stir evenly to obtain a clean fracturing fluid product. The fracturing fluid performance of the present embodiment is detected, and the performance is as follows:

[0023] Table 3 Example 32 obtained fracturing fluid performance test results

[0024] serial number project result 1 Exterior colorless viscous liquid 2 pH value 8.0 3 Base fluid apparent viscosity (mPas, 170 s -1 ) 405 4 High temperature shear viscosity (mPas, 170 s -1 , 80°C) 150 5 Sand-carrying sedimentation rate (mm / min, 80°C) 9.45 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) 24.7

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Abstract

The present invention discloses a novel cleaning fracturing fluid system and a preparation method thereof. The system is characterized in that the fracturing fluid system comprises the following components in percentage by mass: 2%-6% of a cationic surfactant, 1%-5% of a cosurfactant, 0.5%-2% of an organic salt, 2%-7% of an inorganic salt and the balance of water. The preparation method for the cleaning fracturing fluid comprises the steps of: first mixing the cationic surfactant, the cosurfactant and water to obtain a uniform and transparent liquid; and sequentially adding an aqueous solution of the organic salt and the inorganic salt into the uniform and transparent liquid in the case of stirring, and stirring the system for uniform mixing. The preparation method for the cleaning fracturing fluid is simple, convenient in operation, good in viscoelasticity of the system and strong in sand-carrying capability without residues, breaks gels with water or oil automatically, and is easy to return and has small harm to strata.

Description

technical field [0001] The invention relates to a novel clean fracturing fluid system and a preparation method thereof. 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. In the process of exploration and development of oil and gas reservoirs, some low-permeability reservoirs are often found. Using guar gum and other polymer fracturing fluid systems for fracturing of such reservoirs will not only leave Part of the residue can also cause the expansion, dispersion and migration of clay minerals in the formation, causing greater...

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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