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Clean fracturing fluid and use thereof

A technology for cleaning fracturing fluids and thickeners, applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of high cross-linking speed of fracturing fluids, easy clumping of proppants, and high viscosity of flowback fluids. Achieve the effect of reducing transportation burden, low interfacial tension and high concentration

Inactive Publication Date: 2011-08-10
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 low saturation and fracturing fluid in the high-sand ratio stage, the fracturing fluid cannot fully contact the underground crude oil, and it is difficult to completely break the gel, and the flowback fluid has a high viscosity and sometimes contains sand; The cross-linking speed of cracking fluid is fast and the proppant is easy to cluster

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1, the synthesis of thickener N-oleic acid amidopropyl-N-(1,2 hydroxy-propyl)-N,N-dimethyl ammonium chloride

[0035] In a 1000L synthesis kettle, add 460Kg oleic acid, then add 183Kg N,N-dimethylpropylenediamine, stir while adding, heat up to 150°C±5°C after adding, react for about 6hr, and take samples regularly during the reaction , Measure the amine value of the mixture with hydrochloric acid standard solution. When the amine value of the reactant no longer changes, cool down to 60°C, add 20Kg of ethanol, and stir evenly. Add 232Kg 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°C±5°C, and reflux for 5 hours to obtain the product N-oleic acid amide Propyl-N-(1,2-hydroxy-propyl)-N,N-dimethylammonium chloride.

Embodiment 2

[0036] Embodiment 2, the synthesis of thickener N-serinamidopropyl-N-(1,2 hydroxy-propyl)-N,N-dimethylammonium chloride

[0037] In a 1000L synthesis kettle, add 414Kg sinapinic acid, then add 207Kg N,N-dimethylpropylenediamine, stir while adding, heat up to 160°C±5°C after adding, react for about 6hr, and take samples regularly during the reaction , Measure the amine value of the mixture with hydrochloric acid standard solution. When the amine value of the reactant no longer changes, cool down to 60°C, add 21Kg of ethanol, and stir 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°C±5°C, and reflux for 5 hours to obtain the product N-erucamide propane -N-(1,2-hydroxy-propyl)-N,N-dimethylammonium chloride.

Embodiment 3

[0038] Embodiment 3, the synthesis of thickener N-serinamidopropyl-N-(1,2 hydroxy-propyl)-N,N-dimethylammonium chloride

[0039] In a 1000L synthesis kettle, add 440Kg methyl sinapinate, then add 207Kg N,N-dimethylpropylenediamine, stir while adding, add 3.3Kg KOH as a catalyst after adding, heat up to 160°C±5°C, React for about 6 hours, take samples regularly during the reaction, measure the amine value of the mixture with hydrochloric acid standard solution, when the amine value of the reactant no longer changes, cool down to 60°C, add 21Kg of ethanol, and stir well. 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°C±5°C, and reflux 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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Patent Type & Authority Patents(China)
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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