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A kind of supercritical carbon dioxide thickener and its preparation method and application

A carbon dioxide and supercritical technology, applied in the field of oil field fracturing, can solve the problems of unfavorable storage, transportation and environmental protection, high consumption and high cost, and achieve the effect of eliminating post-treatment process, realizing oil layer production increase, and optimizing synthesis reaction conditions.

Active Publication Date: 2019-07-30
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, the thickeners used in supercritical carbon dioxide mainly include fluorine-containing polymers and silicon-containing polymers. The former is the most effective type of thickening, but there are problems of large amount and high cost; silicon-containing polymers It is an ideal cost-effective category, but it contains a large amount of organic solvents, which is not conducive to storage, transportation and environmental protection

Method used

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  • A kind of supercritical carbon dioxide thickener and its preparation method and application

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preparation example Construction

[0036] According to the second aspect of the present invention, the present invention provides a kind of preparation method of supercritical carbon dioxide thickener, the method comprises the steps:

[0037] In a supercritical carbon dioxide medium, each component is reacted under stirring conditions, and the reaction conditions include: temperature of 30-100° C., pressure of 7-30 MPa, and time of 8-16 hours.

[0038] Preferably, the reaction conditions include: a temperature of 50-60° C., a pressure of 7-10 MPa, and a time of 10-12 hours.

[0039] Preferably, the components are added to the reaction in a sealable reactor, such as a reactor.

[0040] Fill the reactor with CO 2 Gas, such as filling with a pump, if the required pressure is not reached, add CO 2 gas.

[0041] Preferably, the progress of the reaction is monitored through pressure changes, and after the final system pressure no longer changes, the temperature of the reactor is lowered to room temperature, for ex...

Embodiment 1

[0047] 100 parts by weight of polydimethylsiloxane with a viscosity of 50 mPa·s, 50 parts by weight of n-butyl acrylate, 1 part by weight of styrene, 0.05 parts by weight of azobisisobutyronitrile and 3 parts by weight of dodecyl Put sodium benzenesulfonate into the reaction kettle, seal it, and inject CO with a pump 2 Gas, pressurized to 7MPa, then close the inlet and outlet valves, and heat. Raise the temperature to 50°C, start the stirrer, and react for 10 hours. After the reaction, it was naturally cooled to room temperature. Open the outlet valve and slowly reduce to normal pressure, the product is a porous white solid.

Embodiment 2

[0049]200 parts by weight of polydimethylsiloxane with a viscosity of 100 mPa·s, 50 parts by weight of 2-ethylhexyl acrylate, 2 parts by weight of sodium styrene sulfonate, 0.06 parts by weight of azobisisobutyronitrile and 1 The sodium dodecylbenzene sulfonate of weight part is put into reactor, seals, and pumps into CO 2 Gas, pressurized to 10MPa, then close the inlet and outlet valves tightly, and heat. Raise the temperature to 60°C, start the stirrer, and react for 12 hours. After the reaction, it was naturally cooled to room temperature. Open the outlet valve and slowly reduce to normal pressure, the product is a porous white solid.

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Abstract

The invention provides a supercritical carbon dioxide thickener and its preparation method and application. The thickener contains the following components: (a) polydimethylsiloxane; (b) acrylate compounds; (c) benzene Vinyl compounds; (d) initiators; (e) emulsifiers; wherein, the component (a) is polydimethylsiloxane with a viscosity of 50-3000mPa·s. The thickener prepared by the method of the invention can thicken supercritical carbon dioxide more than 100 times. The supercritical carbon dioxide fluid thickened by the thickener can suspend 1%-10% (volume ratio) proppant. The supercritical carbon dioxide fracturing fluid thickened by the thickener can effectively realize oil layer stimulation.

Description

technical field [0001] The invention relates to the technical field of oil field fracturing, and more specifically relates to a supercritical carbon dioxide thickener and a preparation method and application thereof. Background technique [0002] Fracturing has been developed rapidly and widely used as the main production and injection measures of oil and gas reservoirs, and fracturing fluid is an important part of fracturing technology. At present, the most commonly used fracturing fluid at home and abroad is water-based fracturing fluid, which has achieved good production stimulation effects. However, the traditional water-based fracturing fluid system is not suitable for strong water-sensitive, water-locked and low-pressure formations. [0003] Supercritical carbon dioxide fracturing fluid is a new type of fracturing fluid developed in recent years. Supercritical carbon dioxide refers to the carbon dioxide fluid whose temperature and pressure are higher than its critica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/12C08F220/18C08F212/14C08F212/08C09K8/68
CPCC09K8/68C08F283/12C08F220/1806C08F220/1804C08F212/14Y02P20/54
Inventor 张艳张汝生赵梦云苏长明郑承纲张锁兵
Owner CHINA PETROLEUM & CHEM CORP
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