Supercritical CO2 microemulsion and method for improving oil recovery factor

A microemulsion and supercritical technology, applied in chemical instruments and methods, drilling compositions, bulk chemical production, etc., can solve problems such as failure to achieve miscible flooding, large amount of hydrocarbon gas mixed in, MMP rise, etc. Achieve the effects of reducing the minimum miscible pressure, large application prospects, and enhancing oil recovery

Inactive Publication Date: 2014-12-10
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, to the CO 2 The mixing of hydrocarbon gas in the medium requires a large amount of hydrocarbon gas mixed in, and it is difficult to carry out this application in oilfields lacking hydrocarbon gas, and the hydrocarbon gas injected into the reservoir may be mixed with CO during the displacement process. 2 Separation occurs, resulting in CO 2 The MMP of flooding increases, which cannot meet the requirements of miscible flooding

Method used

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  • Supercritical CO2 microemulsion and method for improving oil recovery factor
  • Supercritical CO2 microemulsion and method for improving oil recovery factor
  • Supercritical CO2 microemulsion and method for improving oil recovery factor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] This embodiment provides a supercritical CO 2 Microemulsion, by weight percentage, its raw material composition comprises:

[0041] Surfactant Di-(1-ethyl-2-methyl-1-pentyl) sodium sulfosuccinate 10.0×10 -3 %, absolute ethanol 14.1%, deionized water 1.21%, the balance is CO 2 .

[0042] The supercritical CO 2 Microemulsions are prepared by the following steps:

[0043] Stabilize the temperature at 45°C, add the surfactant bis-(1-ethyl-2-methyl-1-pentyl) sodium sulfosuccinate, absolute ethanol and deionized water into the visible phase tank, will CO 2 The gas is pressed into the visible phase tank until the pressure is 1MPa lower than the predetermined pressure;

[0044] After equilibrating for 20min, slowly inject CO 2 Adjust the pressure of the system in the visible phase state to 19.0MPa (i.e. the predetermined pressure), stabilize it for 10 minutes, and obtain transparent and uniform supercritical CO 2 Microemulsion.

[0045] The above supercritical CO 2 Th...

Embodiment 2

[0056] This embodiment provides a supercritical CO 2 Microemulsion, by weight percentage, its raw material composition comprises:

[0057] Di-(1-ethyl-2-methyl-1-pentyl) sodium sulfosuccinate 8.0×10 -3 %, absolute ethanol 14.0%, deionized water 1.0%, and the balance is CO 2 .

[0058] The supercritical CO 2 Microemulsions are prepared by the following steps:

[0059] Stabilize the temperature at 55°C, add the surfactant bis-(1-ethyl-2-methyl-1-pentyl)sodium sulfosuccinate, absolute ethanol and deionized water into the visible phase state kettle, will CO 2 The gas is pressed into the visible phase tank until the pressure is about 1 MPa lower than the predetermined pressure;

[0060] After equilibrating for 20min, slowly inject CO 2 Adjust the pressure of the system in the visible phase state to 19.0MPa (i.e. the predetermined pressure), stabilize it for 10 minutes, and obtain transparent and uniform supercritical CO 2 Microemulsion.

[0061] The thin tube 5 saturated c...

Embodiment 3

[0066] This embodiment provides a supercritical CO 2 Microemulsion, by weight percentage, its raw material composition comprises:

[0067] Surfactant polyethylene glycol-2,6,8-trimethyl-4-nonyl ether 5.0×10 -3 %, absolute ethanol 13.5%, deionized water 1.5%, the balance is CO 2 .

[0068] The supercritical CO 2 Microemulsions are prepared by the following steps:

[0069] Stabilize the temperature at 55°C, add the surfactant polyethylene glycol-2,6,8-trimethyl-4-nonanyl ether, absolute ethanol and deionized water into the visible phase kettle, and the CO 2 The gas is pressed into the visible phase state tank until the pressure is 1MPa lower than the predetermined pressure;

[0070] After equilibrating for 20min, slowly inject CO 2 Adjust the pressure of the system in the visible phase state to 19.0MPa (that is, the predetermined pressure), and stabilize it for 10 minutes to obtain transparent and uniform supercritical CO 2 Microemulsion.

[0071] The thin tube 5 saturat...

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Abstract

The invention provides a supercritical CO2 microemulsion and a method for improving an oil recovery factor. The supercritical CO2 microemulsion comprises the following raw materials in percentages by weight: 4.5*10<-3>wt% to 16.5*10<-3>wt% of a surfactant, 12.0wt% to 14.5wt% of a cosurfactant, 0.2wt% to 1.8wt% of water, and 83.7wt% to 87.8wt% of CO2, wherein the surfactant is one of 2-(1-ethyl-2-methyl-1-pentyl) sodium sulfosuccinate or a homolog of 2-(1-ethyl-2-methyl-1-pentyl) sodium sulfosuccinate, polyethylene glycol-2,6,8-trimethyl-4-nonyl ether, perfluorinated alkyl polyoxyethylene, polyacrylic acid 1,1-perfluorooctyl dihydrogen phosphate, polydimethylsiloxane, and polyacrylic acid 1,1-dihydrogen perfluorinated octyl methyl ester-b-polyoxyethylene; and the cosurfactant is ethanol, propyl alcohol, butanol, pentanol or hexyl alcohol. The invention also provides a method for improving an oil recovery factor. The method comprises a step of improving the oil recovery factor by adopting the supercritical CO2 microemulsion.

Description

technical field [0001] The present invention relates to a kind of supercritical CO 2 The microemulsion and the method for improving oil recovery belong to the technical field of improving oil recovery. Background technique [0002] Petroleum plays an extremely important role in the economic development of the country. However, since oil is a non-renewable resource, with the deepening of exploration and development, the difficulty of mining gradually increases. Therefore, how to enhance oil recovery is one of the problems that must be solved in the process of oil and gas field development. [0003] The average recovery rate of my country's developed oil fields is only about 33%, and there is still a large amount of crude oil left in the ground, which needs to be exploited by "tertiary oil recovery" technology. Beginning in the 1950s, CO 2 Because of its own unique performance, as an important means of oil recovery, considerable research and application have been carried o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/594
CPCC09K8/594Y02P20/54
Inventor 张娟李翼崔波林梅钦董朝霞
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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