Clean fracturing fluid and use thereof

A technology of clean fracturing fluid and synthesis reaction, applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problems of fast cross-linking speed of fracturing fluid, high viscosity of flowback fluid, easy clumping of proppant, etc. Achieve the effect of reducing transportation burden, high concentration and low interfacial tension

Inactive Publication Date: 2009-07-15
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The existing technology is applied to oilfield fracturing to increase production. It shows advantages over water-based polymer fracturing fluid in terms of construction and formation damage prevention. Both fracturing fluid and underground crude oil are used to break the gel. However, in gas wells and oil-bearing For oil wells with

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0034] Example 1. Synthesis of thickener N-oleic acid amidopropyl-N-(1,2 hydroxy-propyl)-N,N-dimethylammonium chloride

[0035] In a 1000L synthesis kettle, add 460Kg of oleic acid, and then add 183Kg of N,N-dimethylpropanediamine, stirring while adding, after the addition, the temperature is raised to 150℃±5℃, and the reaction is about 6hr. Samples are taken regularly during the reaction. , Determine the amine value of the mixture with a standard hydrochloric acid solution. When the amine value of the reactant does not change, the temperature is reduced to 60°C, 20Kg of ethanol is added, and the mixture is stirred evenly. Add 232Kg of 3-chloro-1,2-propanediol, adjust the pH value of the reactant between 7-8 with 20% NaOH aqueous solution, heat up to 80℃±5℃, reflux for 5hr to obtain the product N-oleic acid amide Propyl-N-(1,2hydroxy-propyl)-N,N-dimethylammonium chloride.

Example Embodiment

[0036] Example 2. Synthesis of thickener N-erucamide propyl-N-(1,2 hydroxy-propyl)-N,N-dimethylammonium chloride

[0037] In a 1000L synthesis kettle, add 414Kg of sinapinic acid, then add 207Kg of N,N-dimethylpropanediamine, and stir while adding. After the addition, the temperature is raised to 160℃±5℃, and the reaction is about 6hr. Samples are taken regularly during the reaction Determine the amine value of the mixture with a standard hydrochloric acid solution. When the amine value of the reactant does not change, the temperature is lowered to 60°C, 21Kg of ethanol is added, and the mixture is stirred evenly. Add 263Kg of 3-chloro-1,2-propanediol, adjust the pH value of the reactant between 7-8 with 20% NaOH aqueous solution, raise the temperature to 80℃±5℃, reflux for 5hr to obtain the product N-erucamide propyl Group-N-(1,2 hydroxy-propyl)-N,N-dimethylammonium chloride.

Example Embodiment

[0038] Example 3. Synthesis of thickener N-erucamide propyl-N-(1,2 hydroxy-propyl)-N,N-dimethylammonium chloride

[0039] In a 1000L synthesis kettle, add 440Kg of erucic acid methyl ester, and then add 207Kg of N,N-dimethylpropanediamine, stirring while adding, add 3.3Kg of KOH as a catalyst after the addition, and heat to 160℃±5℃, The reaction is about 6 hours. Samples are taken regularly during the reaction. The amine value of the mixture is measured with a standard hydrochloric acid solution. When the amine value of the reactant does not change, the temperature is reduced to 60°C, 21Kg of ethanol is added, and the mixture is stirred evenly. Add 263Kg of 3-chloro-1,2-propanediol, adjust the pH value of the reactant between 7-8 with a 20% NaOH aqueous solution, raise the temperature to 80°C ± 5°C, reflux and react for 5 hours to obtain the product.

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PUM

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Abstract

The invention relates to a clean fracturing fluid and the application thereof, and the fracturing fluid comprises the components based on the parts by mass: 50-80 parts of thickening agent, 10-35 parts of salicylate and 2-5 parts of gel breaker. The clean fracturing fluid is used for fracturing oil field; in the application site, the components are mixed according to the parts by mass to prepare aqueous solution with the mass percent of 2-6% and evenly stirred, and then is thrown into an oil well together fracturing propping agent. The fracturing propping agent of the clean fracturing fluid is even in dispersion and thorough in gelout.

Description

(1) Technical field [0001] The invention relates to a fracturing fluid used for fracturing stimulation measures in the development process of oil and gas fields and a preparation method thereof, in particular to a clean fracturing fluid and a preparation method thereof, belonging to the technical field of oil field chemistry. (2) Background technology [0002] At present, the oil recovery rate and recovery degree of low-permeability reservoirs in my country's oilfields are relatively low, and it is very difficult to stabilize production. Fracturing technology is the leading technology for production stimulation. The most commonly used fracturing fluid at home and abroad is water-based polymer fracturing fluid. Natural or synthetic polymers form high-viscosity fracturing fluids under the action of cross-linking agents. The disadvantage of these fracturing fluid systems is that the gel breaking of the fracturing fluid is not complete, and the residue will remain in the fractur...

Claims

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Application Information

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IPC IPC(8): C09K8/68
Inventor 王彦玲杨彪邵红云赵修太邱广敏刘德新郑晶晶胡娟倪洁李海涛
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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