Oil-external emulsion oil displacement agent and preparation method and application thereof

A liquid displacement agent and emulsion technology, applied in the field of crude oil exploitation, can solve the problems of surfactant adsorption loss, limited fluidity control ability of oil displacement agent, low viscosity retention rate, etc., to reduce fluidity and improve recovery Ratio, the effect of expanding the affected volume

Inactive Publication Date: 2014-06-25
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the development of special reservoirs, especially high-temperature and high-salt reservoirs, some conventional development methods are not effective at present, so it is necessary to study the methods and technologies of enhanced oil recovery that meet the needs of special reservoirs
[0003] Polymer flooding, polymer binary flooding and polymer ASP flooding technologies are currently the main technologies for enhancing oil recovery in my country, and have achieved great success. However, research results in recent years have shown that oil with high temperature, high salt and high permeability Reservoirs are not suitable for polymer flooding or composite flooding, because the polymer is greatly affected by temperature and salinity, and has no shear resistance, thermal degradation, and salt-sensitive eff

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] This embodiment provides a kind of oil displacement agent of external phase emulsion, and its composition comprises: 0.8g polyisobutylene succinate glyceride, 60mL heavy oil (at 95 ℃, viscosity is 140.3cp, density is 0.9211g / cm 3 ) and 140mL of tap water.

[0030] This embodiment also provides the preparation method of the above-mentioned oil external phase emulsion oil displacement agent, the specific process is as follows:

[0031] Dissolve the emulsifier in 0.2g of kerosene, heat it to 95°C, add it to the flowing heavy oil preheated to 95°C, stir evenly, put it in a thermostat at 95°C for 15 minutes, and then pour it into the corrugated In a mixer, beat on low speed until smooth. Use a measuring cylinder to measure 140 mL of tap water at 95°C, pour it into a blender, stir at a speed of 10,000 r / min for 5 minutes, let it stand for 2 minutes, and stir for another 10 minutes to obtain the oil-external emulsion oil-displacing agent.

Embodiment 2

[0033] In this embodiment, viscosity measurement and temperature resistance stability test are carried out for the oil displacement agent of the oil external phase emulsion in the embodiment 1.

[0034] Viscosity measurement

[0035] The oil-external-phase emulsion oil displacement agent prepared in Example 1 was used to measure the viscosity of the system at 80° C.-95° C. using a RS600 rheometer (Hacke, Germany).

[0036] Viscosity measurement results show that under this condition, the oil-external-phase emulsion oil displacement agent prepared in Example 1 is 6s at a shear rate -1 When the viscosity is 8372mPa · s.

[0037] Temperature Stability Test

[0038] Take 6 groups of oil-external emulsion oil displacement agents prepared in Example 1 as samples, place them in a constant temperature box at 95°C, observe them for 21 days, and use the water separation rate (FV) and stability score (SV) to characterize their temperature resistance stability.

[0039] Among them, FV...

Embodiment 3

[0048] This embodiment provides a kind of oil displacement agent of external phase emulsion, and its composition comprises: 0.8g polyisobutylene succinate glyceride, 60mL crude oil and 140mL simulated formation water (salinity 15×10 4 mg / L).

[0049] This embodiment also provides a preparation method of the above-mentioned oil-external emulsion oil displacement agent, and the specific process is the same as that of Embodiment 1.

[0050] Six groups of the above-mentioned oil-external-emulsion oil-displacing agents were used for the salt-tolerance stability test.

[0051]Using simulated formation water with different salinity (the salinity is 5 / 7 / 10 / 15 / 17 / 20×10 4 mg / L) to prepare a stable oil-external emulsion oil-displacing agent, then place 6 groups of oil-displacing agents in a constant temperature box at 95°C, observe for 21 days, and use FV and SV to characterize the salt-tolerant stability of the system. The test results show that the average FV of the oil displacement ...

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Abstract

The invention provides an oil-external emulsion oil displacement agent and a preparation method and application thereof. The oil-external emulsion oil displacement agent comprises an emulsifier, raw oil and water, wherein the volume content of the emulsifier accounts for 0.2-0.4 percent of total volume of the oil-external emulsion oil displacement agent; the volume content of the raw oil accounts for 30 percent of total volume of the oil-external emulsion oil displacement agent; the balance is the water. The emulsifier comprises one or more than one in polyisobutene succinic monosorbate, polyisobutene triethylene glycol succinate and polyisobutene glyceride succinate. The invention also provides a method for preparing the oil-external emulsion oil displacement agent and an oil displacement method using the oil displacement agent. The oil displacement agent provided by the invention is an oil displacement agent which is high in temperature resistance, salt resistance and high adsorption resistance, fluidity control and resistance adjustment can be realized, the swept volume can be effectively enlarged, and the aim of improving the water displacement recovery is reached.

Description

technical field [0001] The invention relates to an oil displacement agent and its preparation method and application, in particular to an oil external phase emulsion oil displacement agent and its preparation method and application, and belongs to the technical field of crude oil exploitation. Background technique [0002] With the development of industry, the contradiction between the social demand for oil and the serious shortage of oil resources has become increasingly serious. How to extract more oil from the developed oil fields has become a technical problem for petroleum experts. With the advancement of science and technology, some special reservoirs are being developed more and more, such as low permeability reservoirs, ultra-low permeability reservoirs, high temperature and high salinity reservoirs and so on. For the development of special reservoirs, especially high-temperature and high-salt reservoirs, some conventional development methods are not effective at pr...

Claims

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Application Information

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IPC IPC(8): C09K8/584E21B43/22
CPCC09K8/584E21B43/16
Inventor 侯吉瑞端祥刚李实赵凤兰程婷婷马云飞俞宏伟
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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