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Enhanced foam oil-displacing agent for improving oil recovery rate in tertiary oil recovery, and preparation method thereof

A technology of foam flooding and oil recovery, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of high cost and application limitations of salt-resistant polymer flooding, and achieve the reduction of adsorption consumption and stability Good, the effect of enhancing stability

Inactive Publication Date: 2013-03-20
LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Because chemical flooding methods such as polymer flooding and gel treatment are limited by technical and economical factors, such as polymer salt resistance, polymer molecular weight, polymer dosage, and high cost of polymer flooding, they are widely used in mines. applications on the

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 0.3% of sodium α-alkenyl sulfonate, 0.25% of fatty alcohol polyoxyethylene ether sulfate, 0.05% of nonylphenol polyoxyethylene ether, 0.08% of xanthan gum, and 0.03% of alcohols with a carbon chain length of C12-C16, Add water to the remaining part to 100%, add it to a mixer equipped with a stirring device, stir gently at room temperature or 40°C to make it evenly mixed, and obtain an enhanced foam oil displacement agent.

[0030] At room temperature, the salinity of NaCl>5000mg / L, CaCl 2 >3000mg / L, take 100 ml of oil displacement agent and apply it to the laboratory test of the enhanced foam system, the foam volume is 900ml, and the half-life of the solution is 2h.

[0031] At room temperature, under the condition of 15% crude oil addition, 100 ml of oil displacement agent was used in the laboratory test of the enhanced foam system. The foam volume was 920 ml, and the half-life of the solution was 0.5 h.

Embodiment 2

[0033] 0.5% sodium α-alkenyl sulfonate, 0.45% fatty alcohol polyoxyethylene ether sulfate, 0.05% octylphenol polyoxyethylene ether, 0.08% xanthan gum, 0.03% alcohols with carbon chain length C12-C16, Add water to the remaining part to 100%, add it to a mixer equipped with a stirring device, stir gently at room temperature or 40°C to make it evenly mixed, and obtain an enhanced foam oil displacement agent.

[0034] At room temperature, the salinity of NaCl>5000mg / L, CaCl 2 >3000mg / L, take 100ml of oil displacement agent and apply it to the laboratory test of the enhanced foam system, the foam volume is 930ml, and the half-life of the solution is 2.5h.

[0035] At room temperature, under the condition of 15% crude oil addition, 100 ml oil displacement agent was used in the laboratory test of enhanced foam system. The foaming volume was 950 ml, and the half-life of liquid separation was 0.8 h.

Embodiment 3

[0037] Add 0.5% sodium α-alkenyl sulfonate, 0.45% fatty alcohol polyoxyethylene ether sulfate, 0.1% alkyl polyglycoside, 0.06% xanthan gum, 0.03% alcohols with carbon chain length C12-C16, and add the rest Add water to 100%, add it to a mixer equipped with a stirring device, stir gently at room temperature or 40°C to make it evenly mixed, and prepare an enhanced foam oil displacement agent.

[0038] At room temperature, the salinity of NaCl>5000mg / L, CaCl 2 >3000mg / L, take 100ml of oil displacement agent and apply it to the laboratory test of the enhanced foam system.

[0039] At room temperature, under the condition of 15% crude oil addition, 100 ml oil displacement agent was used in the laboratory test of the enhanced foam system. The foam volume was 950 ml, and the half-life of the solution was 0.6 h.

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PUM

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Abstract

The invention relates to an enhanced foam oil-displacing agent for improving the oil recovery rate in tertiary oil recovery, and a preparation method of the enhanced foam oil-displacing agent; the foam oil-displacing agent comprises the raw materials by weight percent: 0.2-0.95% of anionic surfactant, 0.01-2.0% of nonionic surfactant, 0.01-0.15% of water-soluble polymer, 0.01-0.05% of additive and the balance of water. A novel enhanced foam oil-displacing system is formed by carrying out multiple associations and intermolecular weak interaction between the enhanced foam oil-displacing agent and the polymer based on complementary structure and good compatibility. The system has the properties of resisting salt and oil, being higher in viscosity and ultralow in interfacial tension and the like, and is in accordance with the requirements of environmental protection, so that the oil recovery rate is obviously improved when the system is used for an oil field.

Description

technical field [0001] The invention belongs to the field of petroleum exploitation, and in particular relates to an enhanced foam oil displacement agent used for tertiary oil recovery to enhance crude oil recovery and a preparation method thereof. technical background [0002] At present, most oilfields in China have entered the high water-cut development stage or even the ultra-high water-cut development stage. Primary and secondary oil recovery can no longer meet people's needs. Therefore, tertiary oil recovery technology has been developed rapidly. Using tertiary oil recovery technology to stabilize and increase crude oil production has become an Important issues that industry needs to solve. [0003] Because chemical flooding methods such as polymer flooding and gel treatment are limited by technical and economical factors, such as polymer salt resistance, polymer molecular weight, polymer dosage, and high cost of polymer flooding, they are widely used in mines. The ap...

Claims

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Application Information

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IPC IPC(8): C09K8/584C09K8/588
Inventor 张强张洪林李长波邱峰马会强赵国峥李爽姜虎生
Owner LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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