Clean fracturing fluid and preparation method thereof

A technology for cleaning fracturing fluid and glue, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of restricting large-scale use, prone to "fish eyes, difficult to pump fluid, etc., and achieve low production costs" , the effect of strong complexation and cost reduction

Inactive Publication Date: 2014-12-10
XI'AN PETROLEUM UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The biggest advantages of this fracturing fluid are low residue, good shear resistance, and significantly improved temperature resistance (below 120°C), but the disadvantages are (1) the solid powder thickener dissolves slowly in water when the liquid is mixed on site. "Fish eyes" are easy to appear; (2) When the amount of thickener is increased to 0.4%, the viscosity of the original glue solution is greater than 90mPa s, and it is difficult to pump liquid during on-site construction; (3) The amount is large and the cost is high
The above shortcomings limit its large-scale use

Method used

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  • Clean fracturing fluid and preparation method thereof
  • Clean fracturing fluid and preparation method thereof
  • Clean fracturing fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The clean fracturing fluid of this embodiment is composed of raw gum solution, viscosity accelerator and gel breaker, and the raw gum solution is made of the following raw materials in mass percentage: 0.2% of hydrophobically associated polyacrylamide, 0.08% of organic acid , clay stabilizer 0.5%, and the balance is water; Described viscosity accelerator is made of the raw material of following mass percent: hexadecyl dihydroxyethyl amine oxide 0.15%, Gemini surfactant (sulfonate type Gemini surface active agent Activator) 0.3%, alkyl low-carbon alcohol 0.5%, pH regulator 0.15%, and the balance is water; the volume ratio of the original glue solution and the viscosity accelerator is 100:8, and the quality of the gel breaker is clean pressure 0.04% of the split liquid quality; the hydrophobic association polyacrylamide is FRAC-102 association thickener (purchased from Xi'an Kali Oilfield Technology Co., Ltd); the organic acid is petroleum sulfonic acid, and the clay is st...

Embodiment 2

[0040] This example is the same as Example 1, except that the hydrophobic association polyacrylamide is FRA-313 association thickener (Beijing Freike Technology Development Company), GRF-1 association non- Cross-linked fracturing fluid thickener (Sichuan Guangya Polymer Chemical Co., Ltd.), CGR-7 associate thickener (Chengdu Jianxiang Shuguan Technology Co., Ltd.) or SXT102 fracturing thickener (Beijing Xitao Technology Development Co., Ltd.), the alkyl amine oxide is octadecyl dihydroxyethyl amine oxide, hexadecyl dimethyl amine oxide, octadecyl dimethyl amine oxide or octadecyl amidopropyl amine oxide Amines, the organic acid being fatty alcohol sulfuric acid, ethylenediaminetetraacetic acid, citric acid, oxalic acid or sulfamic acid, or petroleum sulfonic acid, fatty alcohol sulfuric acid, ethylenediaminetetraacetic acid, citric acid, oxalic acid and sulfamic acid At least two of them, the alkyl lower alcohol is butanol or amyl alcohol, the clay stabilizer is KCl, and the p...

Embodiment 3

[0042] The clean fracturing fluid of this embodiment is composed of raw gum solution, viscosity accelerator and gel breaker, and the raw gum solution is made of the following raw materials in mass percentage: 0.3% of hydrophobically associated polyacrylamide, 0.1% of organic acid , clay stabilizer 0.6%, and the balance is water; Described viscosity accelerator is made of the raw material of following mass percent: hexadecyl dimethyl amine oxide 0.1%, Gemini surfactant (quaternary ammonium salt type Gemini surfactant agent) 0.2%, alkyl low-carbon alcohol 0.8%, pH regulator 0.3%, and the balance is water; the volume ratio of the original glue solution and the viscosity accelerator is 100:5, and the quality of the gel breaker is clean fracturing 0.03% of the liquid mass; the hydrophobic association polyacrylamide is GRF-1 association type non-crosslinked fracturing fluid thickener (purchased from Sichuan Guangya Polymer Chemical Co., Ltd); the organic acid is petroleum sulfonic ac...

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Abstract

The invention discloses a clean fracturing fluid which comprises crude rubber fluid, viscosity accelerant and gel breaker, the crude rubber fluid comprises the following materials by mass percent: 0.1%-0.5% of hydrophobic association polyacrylamide, 0.05%-0.2% of organic acid, 0.1%-0.8% of clay stabilizer and the balance of water; the viscosity accelerant comprises the following materials according to mass percent: 0.05%-0.4% of alkyl amine oxide, 0.1%-0.5% of Gemini surfactant, 0.1%-1.0% of alkyl lower alcohol, 0.05%-0.4% of pH regulator, and the balance of water; the volume ratio of the crude rubber fluid to the viscosity accelerant is 100:(5-10), and the mass of the gel breaker is 0.005%-0.05% that of the clean fracturing fluid. The invention further provides a preparation method of the clean fracturing fluid. The long-term technical problems of high cost and poor temperature resistance performance of the clean fracturing fluid are solved.

Description

technical field [0001] The invention belongs to the technical field of petrochemical industry, and in particular relates to a clean fracturing fluid and a preparation method thereof. Background technique [0002] Fracturing is a major measure for increasing production of oil and gas wells and increasing injection of water wells. Fracturing fluids are divided into water-based fracturing fluids, oil-based fracturing fluids, foam fracturing fluids and clean fracturing fluids. Water-based guar gum fracturing fluid is the main fracturing fluid used in low-permeability and ultra-low-permeability oilfields. The fracturing effect statistics show that the fracturing fluid has many kinds of additives, large residue of gel-breaking fluid, short stable production period after fracturing, poor fracturing effect and complicated fluid preparation process. [0003] VES cationic surfactant type clean fracturing fluid is a polymer-free fracturing fluid system, which has the advantages of no...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68
CPCC09K8/602C09K8/665C09K8/68C09K8/882C09K2208/12C09K2208/26
Inventor 王满学何静吴安明
Owner XI'AN PETROLEUM UNIVERSITY
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