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Harmless clean fracturing fluid

A technology for cleaning fracturing fluid and quaternary ammonium salt, applied in the field of fracturing fluid, can solve the problems of residual microgel, high cost of sodium salicylate, increase the cost of clean fracturing fluid, etc. sticky effect

Inactive Publication Date: 2008-11-05
陕西延长石油油田化学科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of vegetable gum fracturing fluid is that there are residues, which mainly come from two aspects: ① water-insoluble substances in the vegetable gum itself; ② microgels that are not completely broken.
However, the high cost of sodium salicylate greatly increases the cost of using clean fracturing fluid, which is the main reason why clean fracturing fluid has not been used on a large scale for many years

Method used

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  • Harmless clean fracturing fluid

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Select 10 g of dedecyl dimethyl ammonium chloride, 30 g of tetradecyl dimethyl ammonium chloride, 60 g of hexadecyl dimethyl ammonium chloride, 50 g of potassium hypochlorite, and 17 g of ethanol. Add the above substances into water one by one under stirring conditions and mix thoroughly. When it is made into a 4% aqueous solution, the -1 , sheared for 10 minutes, the viscosity is 73mPa·s, has high viscoelasticity, has sand-carrying function, and fully meets the sand-carrying requirements of oil and gas field fracturing fluid.

Embodiment 2

[0023] Select 10 g of dodecyl dimethyl ammonium chloride, 30 g of tetradecyl dimethyl ammonium chloride, 60 g of hexadecyl dimethyl ammonium chloride, 67 g of potassium hypochlorite, and 17 g of ethanol. Add the above substances into water one by one under stirring conditions and mix thoroughly. When it is made into a 4% aqueous solution, the -1 , sheared for 10 minutes, the viscosity is 85mPa·s, has high viscoelasticity, has the function of carrying sand, and fully meets the sand carrying requirements of oil and gas field fracturing fluid.

Embodiment 3

[0025] Select 10 g of dedecyl dimethyl ammonium chloride, 30 g of tetradecyl dimethyl ammonium chloride, 60 g of octadecyl dimethyl ammonium chloride, 67 g of potassium hypochlorite, and 30 g of isopropanol. Add the above substances into water one by one under stirring conditions and mix thoroughly. When it is made into a 4% aqueous solution, the -1 , sheared for 10 minutes, the viscosity is 90mPa·s, has high viscoelasticity, has the function of carrying sand, and fully meets the sand carrying requirements of oil and gas field fracturing fluid.

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Abstract

The invention provides a harmless clean fracturing fluid which contains alkyl quaternary ammonium salt mixture, counter-ion salt, low carbon alcohol and water, wherein, the concentration of an aqueous solution is between 2 percent and 6 percent, and the alkyl quaternary ammonium salt mixture: the counter-ion salt: the low carbon alcohol is equal to 6:3:1 calculating by weight. The raw materials of used components are added into water in sequence according to proportion under agitating condition when using the clean fracturing fluid on site, which has higher viscous elasticity and carrying function when being prepared into an aqueous solution of 2 to 6 percent, thus fully meeting the requirements of the site fracturing fluid sand-carrying of an oil-gas field. The invention has the advantages of simple formula, low cost, small fluid loss, high recovery rate of core permeability, residual free and being easy to be emitted, etc.

Description

technical field [0001] The invention relates to a fracturing fluid for fracturing stimulation measures in the development process of oil and gas fields. Background technique [0002] At present, water-based fracturing fluid is widely used in practice, mainly using vegetable glue (linear macromolecule) as a thickener, and cross-linking with an associated agent under suitable conditions to form a polymer network structure to achieve fracturing liquid viscosity. The underground gel breaking of this type of fracturing fluid must use a chemical gel breaker to destroy the polymer network structure, reduce the viscosity of the fracturing fluid, and achieve the purpose of gel breaking. The disadvantage of vegetable gum fracturing fluid is that there are residues, which mainly come from two aspects: ① water-insoluble substances in the vegetable gum itself; ② microgels left after the gel is not completely broken. Residues cause irreversible damage to the permeability of the fracture...

Claims

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Application Information

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IPC IPC(8): C09K8/68
Inventor 杜景瑞
Owner 陕西延长石油油田化学科技有限责任公司
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