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Method for applying gas-soluble surfactant to fluidity control of carbon dioxide oil displacement

A surfactant and carbon dioxide technology, applied in the fields of fluid production, earthwork drilling, wellbore/well components, etc., can solve the problems of inability to inject foaming agent solution, control the mobility of carbon dioxide, gas-liquid separation, etc. Regeneration performance, low price, and the effect of fluidity control

Active Publication Date: 2014-06-18
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the foaming agent used in conventional foam flooding is generally a water-soluble surfactant, and the injection method is mostly foaming agent solution and carbon dioxide gas slug injection. Conditions where the foaming agent solution cannot be injected without access, thus making it impossible to control the carbon dioxide flow rate with a foaming fluid
In addition, because the foaming agent used in conventional foam flooding is a water-soluble surfactant, when the foam bursts in the formation, carbon dioxide will float up under the action of gravity differentiation, resulting in gas-liquid separation, and it is difficult to form foam regeneration. Deep channel sealing, so that the purpose of effectively controlling the flow of carbon dioxide cannot be achieved

Method used

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  • Method for applying gas-soluble surfactant to fluidity control of carbon dioxide oil displacement
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  • Method for applying gas-soluble surfactant to fluidity control of carbon dioxide oil displacement

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Embodiment 1

[0037] The fatty alcohol polyoxyethylene polyoxypropylene ether described in embodiment 1, embodiment 2, embodiment 3 and embodiment 5~9 is purchased from U.S. Dow Chemical Company, and structural formula is as follows:

[0038]

[0039] Among them: m=5~15, n=4~5.

Embodiment 4

[0040] The nonylphenol polyoxyethylene ether described in embodiment 4 is purchased from the U.S. Dow Chemical Company, and its structural formula is as follows:

[0041]

[0042] Among them: n=5~25.

[0043] Example 1

[0044] A kind of method that aerosol surfactant is used in the fluidity control of carbon dioxide flooding, the steps are as follows:

[0045]Mix fatty alcohol polyoxyethylene polyoxypropylene ether with supercritical carbon dioxide at a mass percentage of 0.3%, the pressure during mixing is 10MPa, and the temperature is 50°C, and then inject it into low-permeability reservoirs according to the existing conventional technology.

[0046] figure 1 It is a flow control flow chart of carbon dioxide flooding mobility control in low-permeability reservoirs implementing the method of this embodiment, including: high-pressure storage tanks 1 , surface injection facilities 2 , injection wells 3 , and low-permeability reservoirs 4 . Dissolve the fatty alcohol poly...

Embodiment 2

[0049] A kind of method that aerosol surfactant is used in the fluidity control of carbon dioxide flooding, the steps are as follows:

[0050] Mix the fatty alcohol polyoxyethylene polyoxypropylene ether and water at a volume percentage of 0.5% at normal temperature and pressure to obtain an air-soluble surfactant solution; then alternately mix the air-soluble surfactant solution with supercritical carbon dioxide They were respectively injected into low-permeability reservoirs, and the injection mass ratio of fatty alcohol polyoxyethylene polyoxypropylene ether to supercritical carbon dioxide was 1:2.

[0051] figure 2 It is a flow control flow chart of carbon dioxide flooding fluidity control in ordinary permeability reservoirs implementing the method of this embodiment, including: water storage tank 5, ground injection facility 6, injection well 7, ground injection facility 8, high-pressure storage tank 9, and oil reservoir 10; Dissolve the fatty alcohol polyoxyethylene po...

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Abstract

The invention relates to a method for applying a gas-soluble surfactant to fluidity control of carbon dioxide oil displacement. The method comprises the following steps that the gas-soluble surfactant and supercritical carbon dioxide are evenly mixed according to the mass percent of 0.1%-1.5%, during mixing, pressure is 7-20MPa, temperature is from 40 DEG to 90 DEG C, then the mixture is poured into an oil reservoir. The gas-soluble surfactant is applied to carbon dioxide oil displacement for the first time, and the selected carbon dioxide oil displacement has a certain solubility in water and the supercritical carbon dioxide respectively. When the gas-soluble surfactants of the type are adopted for underground foaming to control the fluidity of the carbon dioxide, an aqueous phase carry underground injection method can be selected, and a supercritical carbon dioxide phase carry underground injection method also can be selected, so that the method for applying the gas-soluble surfactant to fluidity control of carbon dioxide oil displacement not only can be applied to fluidity control in the carbon dioxide oil displacement process of a low permeability reservoir, but also can be applied to fluidity control in the carbon dioxide oil displacement process of a conventional oil reservoir and a high permeability reservoir.

Description

technical field [0001] The invention relates to a method for using an air-soluble surfactant in fluidity control of carbon dioxide flooding, and belongs to the technical field of carbon dioxide flooding additives. Background technique [0002] In recent years, due to the excessive dependence of human beings on fossil fuels such as coal, oil, and natural gas, the amount of greenhouse gas emissions produced by industry and human life has increased day by day, and the resulting greenhouse effect is seriously threatening the environment on which human beings depend for survival. Among the greenhouse gases emitted by humans, more than 65% are carbon dioxide, and about 69% of these carbon dioxide are related to energy supply and use. How to achieve the reduction of greenhouse gas emissions and meet the increasing energy demand of mankind has become a major issue facing the international community. CCUS (Carbon Capture, Utilization and Storage) is carbon capture, utilization and s...

Claims

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Application Information

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IPC IPC(8): E21B43/16E21B43/22
Inventor 李兆敏张超李松岩李宾飞叶金桥张昀
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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