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Emulsified oil-displacing agent for low permeability oil reservoir, and applications thereof

An oil displacement agent and low permeability technology, applied in the direction of organic chemistry, drilling composition, chemical instruments and methods, etc., to achieve the effect of improving recovery, stabilizing structure and enhancing emulsification

Inactive Publication Date: 2015-11-25
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, there is no relevant report on the flooding of low-permeability reservoirs by surfactant emulsion systems

Method used

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  • Emulsified oil-displacing agent for low permeability oil reservoir, and applications thereof
  • Emulsified oil-displacing agent for low permeability oil reservoir, and applications thereof
  • Emulsified oil-displacing agent for low permeability oil reservoir, and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～6

[0027] The surfactant in the examples is prepared by the following method: in a mixed solvent of water and isopropanol (the volume ratio of water and isopropanol is 1:1), alkyl polyoxyethylene alcohol ether and maleic anhydride are mixed with Mix at a molar ratio of 1:1.1, reflux at 80°C for 24 hours to obtain an alkyl polyoxyethylene ether diacid, separate the alkyl polyoxyethylene ether diacid from the solvent, disperse and dissolve it in water and add sodium sulfite , the molar ratio of the alkyl polyoxyethylene ether diacid to sodium sulfite is 1:1, reflux reaction at 60°C for 5 hours to obtain CH 3 (CH 2 ) n O(C 2 h 4 O) m CH(COOH)CH 2 SO 3 Na, where n=5-17, m=4-10, the surfactant is directly dissolved in water to prepare emulsified oil displacement agents with different concentrations.

[0028] Examples 1-6 are experimental data of core flooding under different surfactant concentrations. The experimental conditions were a temperature of 83° C. and an injection ra...

Embodiment 2

[0031] The injection pressure change curve of embodiment 2 is as figure 1 (surfactant mass concentration 0.2%, injection rate 0.2mL / min), it can be seen that under the same concentration and rate conditions, the injection pressure increases significantly when injecting surfactant for oil displacement. And the emulsified droplets appeared in the production fluid 100 minutes after the surfactant was injected.

[0032]Under the same injection rate, with the change of surfactant concentration, the injection pressure change experiment of core flooding was carried out. The experimental condition is a temperature of 83°C, the core used is 2.5cm diameter, 10cm long natural Bere sandstone, and the permeability is 50md. The injection rate is 0.2mL / min, the relationship curve between the surfactant concentration and the increased injection pressure in the core flooding experiment, and the relationship curve between the surfactant concentration and the enhanced oil recovery are as follow...

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Abstract

The present invention relates to an emulsified oil-displacing agent for low permeability oil reservoir, and applications thereof, and belongs to the field of petroleum development. The emulsified oil-displacing agent comprises a surfactant with a molecular formula of CH3(CH2)nO(C2H4O)mCH(COOH)CH2SO3Na, and when the mass concentration of the surfactant in the emulsified oil-displacing agent is 0.2-0.3% and the injection rate is 0.1-0.3 mL / min, the recovery rate of the crude oil can be increased by more than or equal to 20%. Compared with the conventional oil-displacing agent formed through multi-component compounding, the emulsified oil-displacing agent of the present invention has the following characteristics that the more active groups are combined in the single surfactant, such that the emulsified oil-displacing agent has the characteristics of the compounded surfactant, the stable interface film is easily formed on the oil-water interface, the emulsifying effect on the crude oil is enhanced, and the recovery rate of the crude oil is improved.

Description

technical field [0001] The invention relates to an emulsified oil displacement agent for low-permeability oil reservoirs and its application, belonging to the field of petroleum development. Background technique [0002] It is generally considered that reservoirs with gas side permeability less than 100mDa are low-permeability reservoirs, which play an important role in my country's oilfield development. Parameters that have an important impact on oil recovery in the development of low-permeability reservoirs include: wettability (water-wet, oil-wet, weakly water-wet, strong water-wet, etc.) Viscosity, density, composition, etc.), interfacial tension between oil / water, viscosity of injected water, interfacial tension, capillary force, etc. [0003] Polymer, surfactant and alkali ASP flooding technology, as well as polymer and surfactant binary composite flooding technology are important means of chemical flooding to enhance oil recovery. On the one hand, the polymer can in...

Claims

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Application Information

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IPC IPC(8): C09K8/584C08G65/00C07C309/17C07C303/32E21B43/22
Inventor 卢刚王友启许关利刘平陈少华马涛
Owner CHINA PETROLEUM & CHEM CORP