Emulsion composite oil-displacing system and preparation method and application thereof

A composite flooding and system technology, which can be used in chemical instruments and methods, drilling compositions, etc., and can solve problems such as inapplicability

Inactive Publication Date: 2019-10-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the defect that the existing chemical flooding system is not suitable for high salinity, high calcium and magnesium ion content reservoir formations, and provide a new emulsion composite flooding system and its preparation method and application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0022] The preparation method of the emulsion composite flooding system provided by the present invention includes mixing the high-salinity high-calcium-magnesium water, the temperature-resistant and salt-resistant polymer, the calcium-magnesium complexing agent and the surfactant and adjusting the pH value of the system to 7.5-10, preferably 8-9.5. In the specific operation process, the high mineralization high calcium and magnesium water, temperature-resistant and salt-resistant polymer, calcium-magnesium complexing agent and surfactant can be mixed in any order, and in the process of mixing or after mixing Then use a pH regulator to adjust the pH value of the system to the above range. Particularly preferably, the method for uniformly mixing the high-salinity high-calcium-magnesium water, temperature-resistant and salt-resistant polymer, calcium-magnesium complexing agent and surfactant and adjusting the pH value of the system to the above-mentioned range includes adding th...

Embodiment 1

[0029] This example is used to illustrate the emulsion composite flooding system provided by the present invention and its preparation method.

[0030] Dissolve polyacrylamide (the number average molecular weight is 15 million) in high mineralization high calcium magnesium water (salinity is 3×10 4 mg / L, Ca 2+ The content is 1500mg / L, Mg 2+ Content is 500mg / L), and the polymer aqueous solution that concentration is 2000mg / L is prepared in, and its apparent viscosity at 62 ℃ is 15.8mPa.s. Add calcium-magnesium complexing agent (polyacrylic acid, its number-average molecular weight is 50000) and pH value regulator (sodium carbonate) in this polymer aqueous solution afterwards, stir 30 minutes and make system mix homogeneously, then add surfactant (petroleum Sodium sulfonate, purchased from Tongyi Chemical Industry, the brand is A420), stirred for 20 minutes to obtain the emulsion composite oil displacement system, with respect to 1L of high salinity high calcium magnesium wate...

Embodiment 2

[0032] This example is used to illustrate the emulsion composite flooding system provided by the present invention and its preparation method.

[0033] Dissolve polyacrylamide (number average molecular weight is 15 million) in high mineralization high calcium magnesium water (salinity is 5×10 4 mg / L, Ca 2+ The content is 1000mg / L, Mg 2+ content is 1000mg / L), and the concentration is 2000mg / L polymer aqueous solution, and its apparent viscosity at 62 ℃ is 12.5mPa.s. Add calcium-magnesium complexing agent (amino trimethylene phosphonic acid) and pH value adjusting agent (sodium bicarbonate) in this polymer aqueous solution afterwards, stir 30 minutes and make system mix homogeneously, then add tensio-active agent (double twelve Alkyl diphenyl ether sodium sulfonate), stirred for 20 minutes to obtain the emulsion composite oil displacement system, with respect to 1L of high salinity high calcium magnesium water, the addition of calcium magnesium complexing agent is 2000mg, the ...

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Abstract

The invention relates to the field of the tertiary oil recover of oil fields, and discloses an emulsion composite oil-displacing system and a preparation method and an application thereof. The emulsion composite oil-displacing system contains hypersalinity high-calcium-magnesium water, a heat resistance and salt tolerance polymer, a calcium-magnesium complexing agent and a surfactant. A degree ofmineralization in the hypersalinity high-calcium-magnesium water is not less than 3x104 mg / L and the total content of calcium-magnesium ions is not less than 1000 mg / L. A pH value of the emulsion composite oil-displacing system is 7.5-10. The emulsion composite oil-displacing system has a higher viscosity and an ultralow interface tension. After the emulsion composite oil-displacing system is applied to an oil reservoir stratum of which the degree of mineralization is up to 3x104-5x104 mg / L, and the total content of the calcium-magnesium ions is up to 1000-3000 mg / L, good effects of increasingoil production and reducing water can be achieved, and the emulsion composite oil-displacing system is very suitable for three types of oil reservoirs of hypersalinity high-calcium-magnesium.

Description

technical field [0001] The invention belongs to the field of oil field tertiary oil recovery, and more specifically relates to an emulsion composite oil flooding system and its preparation method and application. Background technique [0002] Petroleum is one of the most important energy sources in the contemporary world. Especially in China, where the automobile industry is developing rapidly, the demand for petroleum is growing rapidly. Oil recovery from oil reservoirs is generally divided into three stages: primary oil recovery relies on the natural energy of the formation to produce oil; secondary oil recovery adopts water injection and gas injection technology to supplement oil energy to produce oil; Oil recovery. At present, most oil fields in my country have entered the stage of high water cut and high recovery degree, and 60-70% of the remaining oil remains in the formation after secondary oil recovery development. Therefore, tertiary oil recovery is particularly im...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/588C09K8/584C09K8/60C09K8/88
CPCC09K8/584C09K8/588C09K8/602C09K8/887
Inventor 谭中良刘平吕成远王友启马涛许关利贾红育卢刚
Owner CHINA PETROLEUM & CHEM CORP
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