Composite flooding system containing lipopeptide biological surfactant and application thereof

Abstract

The invention provides a composite flooding system containing a lipopeptide biological surfactant. The composite flooding system comprises the following components: 6 to 120 mg / L of lipopeptide biological surfactant, 0.01 to 0.30 w / v percent of heavy alkylbenzene sulfonate, and 0.5 to 5 w / v percent of alkali. The lipopeptide biological surfactant is introduced into the conventional composite system, so that the consumption of the alkali and the heavy alkylbenzene sulfonate is obviously reduced, the interfacial activity of the system is further enhanced at the same time, the activity range of the system is further enlarged, and the system is controlled and applied more easily.

Description

technical field [0001] The invention relates to an oil field development oil displacement system, in particular to a composite oil displacement system composed of a lipopeptide biosurfactant, a heavy alkylbenzenesulfonate surfactant and an alkali. Background technique [0002] As a strategic resource, oil is of self-evident significance to every country. With the depletion of crude oil resources and the aggravation of the contradiction between crude oil demand, the technical demand for in-depth development of oil reservoirs is increasing day by day. In the initial stage of oil exploitation, the use of natural energy in the formation is called primary oil recovery; after the natural energy is exhausted, the recovery of energy by injecting water and gas into the oil reservoir is called secondary oil recovery. It is generally believed that after primary and secondary oil recovery, about 70% of the crude oil remains in the formation. The development of this part of crude oil b...

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Problems solved by technology

[0005] 1) The cost of chemically synthesized surfactants is high and the supply is in short supply, which affects the large-scale application;

[0006] 2) Chemically synthesized surfactants are difficult to degrade in nature, causing environmental pollution;

[0007] 3) Alkali can cause formation clay to disperse and migrate, resulting in a decrease in formation permeability; it reacts with oil layer fluid and rock minerals to form alkali scale, which will cause damage to the formation, and wellbore scaling will seriously affect the normal production of oil wells;

[0008] 4) The application of high-concentration alkali can cause serious corrosion of oil production equipment;

[0009] 5) Alkali will greatly reduce the viscoelasticity of the polymer and affect the oil displacement effect of the polymer;

[0010] 6) For the environment with high formation water salinity, the active range of the existing system is narrow, and the field application control is difficult

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