Composition for reducing minimum miscible pressure of carbon dioxide and crude oil and preparation method thereof

A carbon dioxide, miscible pressure technology, applied in drilling compositions, chemical instruments and methods, bulk chemical production, etc. Crude oil fluidity and other problems, to achieve the effect of not easy to decompose, increase thermal stability and decomposition resistance, simple and efficient preparation method

Active Publication Date: 2022-01-04
DESHI ENERGY TECH GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In the prior art, most of the techniques for reducing the minimum miscible pressure of carbon dioxide and crude oil are aimed at ordinary oil reservoirs, and high-waxy crude oil accounts for a considerable proportion of existing crude oil reserves, but the overlapping of wax crystal molecules to form a complex three-dimensional structure is extremely difficult. Affect the fluidity of crude oil and increase the difficulty of mining
[0005] Chinese patent CN107178345B - a composition in reducing CO 2 The application of the minimum miscible pressure with crude oil is to inject ethanol, isopropanol, hexanol and carbon dioxide into the formation. This method is not suitable for high temperature and high waxy oil reservoirs. Low carbon alcohols become flammable and explosive gases at high temperatures, which is safe poor performance, and it is difficult to drive crude oil in high waxy reservoirs
[0006] Chinese patent CN111909679B-a method for preparing a composition based on gas-soluble surfactants to reduce the minimum miscible pressure of carbon dioxide and crude oil discloses the use of ethanol solutions of gas-soluble surfactants mixed with liquid carbon dioxide, and the gas-soluble surfactants are fatty alcohols Oxyethylene polyoxypropylene ether or nonylphenol polyoxyethylene ether, although this method has a good pressure reduction effect, it is still not suitable for high temperature and high waxy reservoirs
[0007] In the prior art, compositions that reduce the minimum miscible pressure of carbon dioxide and crude oil have poor high temperature resistance and viscosity reduction effects, and their application range is limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The preparation of embodiment 1 composition 1#

[0039] The preparation method of composition 1# comprises the following steps:

[0040] (1) Polyoxyethylene alkyl alcohol amide (R is C 12 Alkyl group, n is 30), sodium cocoyl isethionate, azobisisobutyronitrile, N-methylpyrrolidone and boron trifluoride ether were added to the reaction kettle, stirred at 80°C for 2h, Obtain an anionic-nonionic surfactant;

[0041] (2) Continue to add supercritical carbon dioxide into the reaction kettle under the conditions of pressure 10Mpa and temperature 60°C, and stir for 3 hours;

[0042] (3) Keep the pressure at 10Mpa, slowly raise the temperature to 100°C, add fluorine-containing cymene to the reactor (the molar ratio of p-cymene-1-fluorine to o-cymene-5-fluorine is 1:2) , and stirred for 2h to obtain composition 1#.

[0043] Among them, in terms of parts by weight, 20 parts of supercritical carbon dioxide, 20 parts of polyoxyethylene alkanolamide, 20 parts of sodium cocoyl is...

Embodiment 2

[0044] The preparation of embodiment 2 composition 2#

[0045] The preparation method of composition 2# comprises the following steps:

[0046] (1) Polyoxyethylene alkyl alcohol amide (R is C10 Alkyl group, n is 22), sodium cocoyl isethionate, azobisisoheptanonitrile, N-methylpyrrolidone and boron trifluoride ether were added to the reaction kettle, stirred at 60°C for 1h, Obtain an anionic-nonionic surfactant;

[0047] (2) Continue to add supercritical carbon dioxide into the reaction kettle under the conditions of pressure 7Mpa and temperature 50°C, and stir for 2 hours;

[0048] (3) Keep the pressure at 7Mpa, slowly raise the temperature to 80°C, add fluorine-containing cymene to the reaction kettle (the molar ratio of p-cymene-1-fluorine to o-cymene-5-fluorine is 1:2) , and stirred for 1 h to obtain composition 2#.

[0049] Among them, in terms of parts by weight, 10 parts of supercritical carbon dioxide, 10 parts of polyoxyethylene alkanolamide, 10 parts of sodium coco...

Embodiment 3

[0050] The preparation of embodiment 3 composition 3#

[0051] The preparation method of composition 3# comprises the following steps:

[0052] (1) Polyoxyethylene alkyl alcohol amide (R is C 16 Alkyl group, n is 35), sodium cocoyl isethionate, dimethyl azobisisobutyrate, tetraethylene glycol dimethyl ether and heteropoly acid are added to the reaction kettle, at 100 ° C Stir for 3h to obtain anion-nonionic surfactant;

[0053] (2) Continue to add supercritical carbon dioxide into the reaction kettle under the conditions of pressure 15Mpa and temperature 80°C, and stir for 4 hours;

[0054] (3) Keep the pressure at 15Mpa, slowly raise the temperature to 120°C, add fluorine-containing cymene to the reactor (the molar ratio of p-cymene-1-fluorine to o-cymene-5-fluorine is 1:2) , and stirred for 3h to obtain composition 3#.

[0055] Among them, in terms of parts by weight, 30 parts of supercritical carbon dioxide, 25 parts of polyoxyethylene alkanolamide, 25 parts of sodium c...

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Abstract

The invention discloses a composition for reducing the minimum miscible pressure of carbon dioxide and crude oil and a preparation method of the composition, belonging to the field of carbon dioxide oil displacement. The composition is prepared from the following raw materials in parts by weight: 10 to 30 parts of supercritical carbon dioxide, 10 to 25 parts of a nonionic surfactant, 10 to 25 parts of an anionic surfactant, 5 to 15 parts of an initiator, 5 to 15 parts of a reaction aid, 40 to 60 parts of a cosolvent and 10 to 30 parts of fluorine-containing cymene, wherein the nonionic surfactant is polyoxyethylene alkylolamide, R is selected from C10-C16 alkyl groups, and n is any integer in a range of 22 to 35. The composition uses the fluorine-containing cymene and the synthesized anionic-nonionic surfactant, can significantly reduce the minimum miscible pressure of carbon dioxide and crude oil, reduce the viscosity of the crude oil, improve a wax crystal structure in high-wax-content crude oil and reduce the generation of the three-dimensional structure of wax crystal molecules, has good high-temperature resistance, is not easy to decompose, and can improve the recovery rate of the high-wax-content crude oil; and the preparation method is simple and efficient in process and low in cost.

Description

technical field [0001] The application relates to a composition for reducing the minimum miscible pressure of carbon dioxide and crude oil and a preparation method thereof, belonging to the technical field of carbon dioxide flooding. Background technique [0002] The carbon dioxide miscible flooding method is under high temperature reservoir conditions, the carbon dioxide component can extract the light hydrocarbon molecules in the crude oil into the gas phase, at this time, a gas phase rich in hydrocarbons and a liquid liquid in which carbon dioxide is dissolved in the crude oil are formed. phase, the fluidity of the original gas phase will be deteriorated, and the fluidity of the liquid phase crude oil will be improved, thus forming miscible flooding. The effect of miscible flooding is greater than that of near-miscible flooding and immiscible flooding, but the formation pressure in actual reservoirs is often lower than the minimum miscible pressure of carbon dioxide and c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584C09K8/594
CPCC09K8/584C09K8/594Y02P20/54
Inventor 崔仕章宋新旺郭玉玺王黎明崔盈贤侯云福高瑞美张向红刘小芳郭鑫
Owner DESHI ENERGY TECH GRP CO LTD
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