Rapid demulsifier for fracturing acidification and preparation method thereof

A technology of fracturing acidification and demulsification, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as difficult to meet rapid flowback, and achieve the goals of shortening demulsification time, reducing production costs, and good economic benefits Effect

Inactive Publication Date: 2011-11-23
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many types of demulsifiers currently used, but the demulsification time of many demulsifiers is more than 2 hours, even 24 hours, which is difficult to meet the requirements of rapid flowback of working fluid after fracturing and acidification

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Add 10kg of methanol into the enamel reaction kettle, raise the temperature to 50°C, and weigh 2kgC 18 h 37 O(C 2 h 4 O) 6 (C 3 h 6 O) 9 H, 10kg C 9 h 19 C 6 h 4 O(CH 2 CH 2 O) 10 H was added to the reaction kettle under stirring, and after stirring for 1 hour, 77.5kg of water and 0.5kg of isoascorbic acid were added, and after stirring for 1 hour, a demulsifier was obtained.

Embodiment 2

[0023] Add 20kg of methanol into the enamel reaction kettle, raise the temperature to 40°C, and then weigh 10kgC 18 h 37 O(C 2 h 4 O) 7 (C 3 h 6 O) 9 H, 5kg C 8 h 17 C 6 h 4 O(CH 2 CH 2 O) 10 H was added to the reaction kettle under stirring, and after stirring for 1 hour, 64 kg of water and 1 kg of isoascorbic acid were added, and after stirring for 1 hour, a demulsifier was obtained.

Embodiment 3

[0025] Add 15kg of ethylene glycol into the enamel reaction kettle, raise the temperature to 60°C, and then weigh 8kgC 18 h 37 O(C 2 h 4 O) 6 (C 3 h 6 O) 9 H, 7kg C 9 h 19 C 6 h 4 O(CH 2 CH 2 O) 10 H was added to the reaction kettle under stirring, after stirring for 1 hour, 69.5kg of water and 0.5kg of citric acid were added, and after stirring for 1 hour, a demulsifier was obtained.

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Abstract

The invention relates to a rapid demulsifier for fracturing acidification and a preparation method thereof. The rapid demulsifier consists of the following components in percentages by weight: 2-10% of polyoxypropylene polyoxyethylene octadecyl ether, 5-15% of alkylphenyl polyoxyethylene ether, 0.1-1% of stabilizer, 5-30% of cosolvent and the balance of water, wherein the stabilizer is isoascorbic acid or citric acid and the cosolvent is methanol, ethanol, ethylene glycol or isopropyl alcohol. By the synergy of the multiple compounded components, the demulsifier provided by the invention can shorten the demulsification time, improve the demulsification efficiency and save the production cost and has broad market prospects; and the preparation method of the demulsifier is reliable in principle and simple to operate.

Description

technical field [0001] The invention relates to a demulsifier used in fracturing and acidizing operations in oil and gas field development process stimulation measures. Background technique [0002] At present, fracturing and acidizing measures are indispensable technical means in oilfield development. The working fluid (fracturing fluid and acid fluid) used for fracturing and acidizing is foreign to the crude oil in the formation. These fluids contain a large amount of surfactants. Fracture fluid or acid fluid can easily form emulsion with formation crude oil. The frictional resistance is high when the emulsion flows in the pipeline, so if the emulsion formed during the fracturing and acidizing process cannot be demulsified well, it will bring great difficulties to the flowback after fracturing and acidizing, resulting in fracturing If the liquid or acid stays in the formation for a long time, it will cause serious damage to the formation and affect the transformation eff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/74
Inventor 王世彬郭建春邓燕
Owner SOUTHWEST PETROLEUM UNIV
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