Formulation of surfactant oil displacement system for anionic and nonionic oil displacement

Abstract

The invention provides a composition of a surfactant oil displacement system for anionic and nonionic oil displacement. The composition consists of 18% C18 sodium alkyl benzene sulfonate, C16 fatty acid, 25% C2 alkanolamide, 7% C8 alkylphenol polyoxyethylene ether phosphate, 17% ethanol, 3% octanol, 30% water; the alkyl is a hydrocarbyl group with linear chain, branched chain and ring structures in a calibrated carbon atom range, and also can be substituted by one or more halogens, alkyls or alkoxys; the sodium sulfonates are formed by sulfonating different alkanes or arenes by SO3 or chlorosulfonic acid in chloroalkane environment and then neutralizing the sulfonate and sodium hydroxide; and the esterification derivatives are sulfates or phosphates. The formulation has highoil displacement efficiency, strong oil deposit adaptability and good popularization prospect.

Description

technical field [0001] The invention provides a formulation of a surfactant oil displacement system for anion and non-ion oil displacement, and belongs to the field of oil field chemical production. Background technique [0002] In recent years, with the rapid development of crude oil in various oilfields, the demand for enhanced oil recovery has become more and more prominent, and new tertiary oil recovery technologies and new oil displacement technologies after tertiary recovery have received more and more attention. In the past, large-scale injection of polymer polyacrylamide was used in tertiary oil recovery to increase the viscosity coefficient of water flooding to enhance oil recovery. However, with the injection of a large amount of polymers, the pressure of the formation increases, the difficulty of injection increases, and the formation is seriously damaged. Therefore, the development and application of enhanced oil recovery technology after polymer flooding, as a ...

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Problems solved by technology

In addition, most of the early-developed oil fields have entered the high water-cut or ultra-high water-cut period, with large pores and serious channeling, prominent interlayer contradictions, water flooding of oil layers, and further deterioration of water flooding effect

The outstanding contradiction of low oil recovery in water flooding, channeling of injected water along large pores and high permeability layers, and premature water flooding of oil wells seriously restrict crude oil production