Surfactant compounded system with ultralow interfacial tension and preparation method of surfactant compounded system

Abstract

The invention discloses a surfactant compounded system with ultralow interfacial tension and a preparation method of the surfactant compounded system, belonging to the technical field of surfactants. The surfactant compounded system comprises the following components in percentage by mass: 10-33% of a primary surfactant, 7-23% of a synergist, 1-4% of a stabilizer and the balance of water, wherein the primary surfactant is an ampholytic surfactant, the synergist is a nonionic surfactant, and the stabilizer is an anionic surfactant. By using a small amount of the surfactant compounded system with ultralow interfacial tension, the oil-water interfacial tension reaches an order of magnitude of 10<-4>mN / m or lower within a short time; the surfactant compounded system with ultralow interfacial tension is applicable to tertiary oil recovery of a low-permeability or ultralow-permeability reservoir stratum so as to enhance oil recovery; the surfactant compounded system with ultralow interfacial tension also can be used for decompression and augmented injection of a water wall and viscosity reduction of thickened oil; the system is alkali-free and does not damage the stratum when used; the surfactant compounded system with ultralow interfacial tension can be used in industries such as a cleaning agent, an emulgator and a deinking agent; the raw materials are easily available and the system is low in price, good in performance and suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of surfactants, and in particular relates to an ultra-low interfacial tension surfactant compound system and a preparation method thereof. Background technique [0002] In today's increasingly tense energy environment, enhanced oil recovery has become a major topic in oil exploration research, and research on tertiary oil recovery, especially oil recovery with surfactants, has received widespread attention. After water flooding, most of the oil stays in the thinner or narrower capillary pores, and is in a highly dispersed state, and the interfacial tension between oil and water is very high, resulting in a large pressure difference required for driving, while the water injection pressure difference is far away. It is much smaller than the driving pressure difference. Therefore, it is very difficult to increase the pressure difference alone. It is a feasible and effective method to use the surfactant to reduc...

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Problems solved by technology

However, the addition of alkaline agent will increase the pH value, which will increase the expansion of clay minerals and enhance water sensitivity, and the interaction between petroleum sulfonate and exchangeable high-valent cations in formation water and clay will form sulfonate precipitation, which will accumulate in the formation. Scale, etc., thus causing greater damage to the formation, seriously affecting the sustainable development of oil

And the consumption of alkaline agent is generally all higher, also increases the cost of oil extraction, has influenced the economic benefit of oil extraction

[0004] my country's domestic oilfields are basically using water flooding to produce oil. Most of the oilfields have entered the late stage of water flooding development, and most of the residual oil stays in the oil layer in the form of static balls. Cohesion, not easy to extract crude oil

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