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Composition of clean fracturing fluid additives and method for fracturing stratum

A technology for cleaning fracturing fluid and additives, which is applied in fracturing fluid and fracturing fields, and can solve the problems of high price, low operating temperature, and narrow sources of viscoelastic surfactants, etc. The effect of operational requirements

Inactive Publication Date: 2007-05-02
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A typical problem encountered in the past is exaggerating the fluid loss of viscoelastic surfactant-based fracturing fluids
In addition, viscoelastic surfactants have narrow sources, high prices, and low use temperatures are all problems to be solved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0087] 108 grams of cetyltrimethylammonium chloride, 2 grams of lauryldimethylamine oxide, 30 grams of sodium salicylate, 10 grams of ethylene glycol ether acetate, 30 grams of methanol and 10 grams of water, mixed Even, a uniform and transparent liquid can be obtained at 25°C. This liquid can be used as a clean fracturing fluid additive, and a 2% aqueous solution has obvious viscoelasticity.

example 2

[0089] 90 grams of octadecyltrimethylammonium chloride, 6 grams of lauryldimethylamine oxide, 24 grams of sodium salicylate, 15 grams of ethylene glycol ether acetate, 15 grams of ethanol and 10 grams of water, mixed Uniform, you can get a uniform and transparent liquid at 25 ° C, this liquid can be used as a clean fracturing fluid additive.

example 3

[0091] 188g Octadecyltrimethylammonium Chloride, 4g Coco-Alkyldimethylamine Oxide, 48g Sodium Salicylate, 16g Ethylene Glycol Monobutyl Ether Acetate, 44g Ethylene Glycol and 20g Mix well with water to obtain a uniform and transparent liquid at 25°C, which can be used as an additive for cleaning fracturing fluid.

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Abstract

An additive for the clean fracturing liquid contains the quaternary ammonium salt with long-carbon-chain alkyl, ammonium dimethyloxide with long-carbon-chain alkyl, salicylate, ethanediol ether, low-carbon alcohol and water. A method for fracturing stratum includes such steps as preparing said clean fracturing liquid, pressing it into stratum via the jet hole of oil (or gas) well to form cracks in the stratum, pressing the sand-carrying liquid in it, releasing the pressure to close the crack, and returning the fracturing liquid back onto ground. Its advantages are simple apparatus and operation, and use of the fracturing liquid in very cold condition without heater.

Description

technical field [0001] The invention relates to a fracturing fluid and a fracturing method used in oil and gas fields, in particular to a composition of cleaning fracturing fluid additives and a method for fracturing formations. Background technique [0002] In the exploration and development of oil and gas layers, especially low-permeability oil and gas layers, hydraulic fracturing is a commonly used measure. Through hydraulic fracturing, fractures leading to the bottom of the well are formed in the oil and gas layers, which can increase the production of oil and gas more efficiently. [0003] Fracturing fluid is usually a viscous or gel-like fluid. Oil and gas wells are pumped through high-pressure pumps at the surface with a fluid of a certain viscosity at a rate sufficient to form fractures in the formation rock, followed by a gel containing high-strength particles called proppants. When the proppant enters the fracture formed with the fracturing fluid, when the ground...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/66
Inventor 徐敏杰卢拥军丁云宏汪永利杨艳丽杨振周邱晓慧
Owner PETROCHINA CO LTD
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