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Composite oil displacement agent and preparation method and application thereof

A technology of composite oil flooding and active agent, applied in chemical instruments and methods, earthwork drilling, drilling composition, etc., can solve the problems of high cost, poor formation adaptability, formation adsorption, etc., to reduce tension and improve crude oil. The effect of high recovery factor, surface/interfacial activity

Active Publication Date: 2019-04-19
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for a long time, the surfactant flooding system has problems such as formation adsorption, high cost, and poor adaptability to complex formation conditions.

Method used

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  • Composite oil displacement agent and preparation method and application thereof
  • Composite oil displacement agent and preparation method and application thereof
  • Composite oil displacement agent and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] This embodiment provides a composite oil displacement agent. The surfactant in the composite oil displacement agent is composed of A: GAES-1209 and B: cetyltrimethylammonium bromide (CTAB). The molar ratio of A and B is 0.25. By adding the actual formation water in the oilfield to prepare composite oil displacement agents with different total surfactant concentrations (50-800mg / L), the oil displacement test was carried out.

[0039] The instrument uses TX-500C interfacial tension meter, the oil phase is degassed and dehydrated crude oil from an oil field, the test temperature is 45°C, and the oil-water interfacial tension is measured under the condition of 5000 rpm. The experimental results are as follows figure 1 shown. figure 1 It is the change curve of oil / water interfacial tension with the total concentration of surfactant (the square is the single GAES-1209 system, the circle is the cetyltrimethylammonium bromide system, and the triangle is the composite oil displ...

Embodiment 2

[0042] This embodiment provides a composite oil displacement agent. The surfactant in the composite oil displacement agent is composed of A: GAES-1209 and B: cetyltrimethylammonium bromide. A composite oil displacement agent with a total surfactant concentration of 200mg / L was prepared by adding the actual formation water in the oil field, and the molar ratio of A and B was changed, and the oil displacement test was carried out.

[0043] The instrument uses TX-500C interfacial tension meter, the oil phase is degassed and dehydrated crude oil from an oil field, the test temperature is 45°C, and the oil-water interfacial tension is measured under the condition of 5000 rpm. The experimental results are as follows figure 2 shown. figure 2 It is the change curve of oil / water interfacial tension with the mole fraction of cationic surfactant.

[0044] Depend on figure 2 It can be seen that the optimal molar fraction of CTAB is 0.8, that is, when the compounding ratio of GAES-120...

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Abstract

The invention provides a composite oil displacement agent and a preparation method and an application thereof. The composite oil displacement agent includes a symmetrical alkyl alcohol polyoxyethyleneether sulfonate anionic-non-gemini surfactant and a cationic surfactant, with the balance being water. The mol ratio of the symmetrical alkyl alcohol polyoxyethylene ether sulfonate anionic-non-gemini surfactant to the cationic surfactant is 1:2-1:4. The composite oil displacement agent can significantly reduce the oil-water interfacial tension, especially can produce ultra-low interfacial tension for low-permeability reservoirs, has excellent interfacial activity, and has significance for efficient development of the low-permeability reservoirs and the improvement of crude oil recovery efficiency.

Description

technical field [0001] The invention belongs to the technical field of tertiary oil recovery in oil field development, and in particular relates to a composite oil displacement agent and its preparation method and application. Background technique [0002] For a long period of time in the future, low-permeability reservoirs will occupy an important position in my country's petroleum industry, and will be an important resource base for my country's petroleum industry to increase reserves and production. [0003] In low-permeability reservoirs, surfactant and its compound flooding system are one of the main means to activate residual oil. Adding surfactants into the injected water for oil displacement can effectively reduce the interfacial tension between oil and water, produce emulsification, change the wettability of the rock surface, reduce the adsorption capacity of rock formations for oil, and increase the dissolution and dispersion of oil in water ability, so that the r...

Claims

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Application Information

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IPC IPC(8): C09K8/584E21B43/22
CPCC09K8/584E21B43/16
Inventor 白宝君徐德荣冯海顺李哲吴海荣侯吉瑞康万利
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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