Self-emulsifier and use thereof in tertiary oil recovery

Abstract

The invention discloses a self-emulsifier and use thereof in binary compound tertiary oil recovery. The emulsifier comprises the following components in percentage by mass: 24 to 30 percent of alkyl amido betaine, 9 to 24 percent of carboxylic amino acid type amphoteric nonionic surfactant, 5 to 14 percent of amine oxide surfactant, 1 to 5 percent of fatty alcohol-polyoxyethylene ether, 0.7 to 3.7 percent of polyoxyethylene sorbitan monooleate, 1 to 2.3 percent of nonyl hydroxybenzene polyethoxylate ether, 0.5 to 1.5 percent of fatty acid methyl ester ethoxylate, 0.6 to 3.7 percent of C6 to C8 fatty alcohol , 0.4 to 2.3 percent of triethanolamine, 0.5 percent of monoglycerylester palmitate and the balance of water. The emulsifier prepared by the method emulsifies crude oil under the condition of low shearing force or no external force of a binary compound system and makes an emulsifying system stable.

Description

Technical field: [0001] The invention relates to a self-emulsifying agent and its application in tertiary oil recovery. Background technique: [0002] Although the ASP ASP flooding technology has achieved good results in field applications in recent years, due to the presence of active components such as strong alkali and surfactant in the ASP composite system, there are different degrees of residual oil in the reservoir and produced fluid. Emulsification, the emulsification in the oil reservoir plays a role in promoting the recovery factor, because the ASP ternary compound system has problems such as the decline of production capacity, serious emulsification of strong alkali production fluid, and corrosion and scaling. Therefore, the mine adopts the binary compound flooding technology to solve the problems caused by the strong alkali in the triple compound flooding technology and has achieved good results. The binary compound system lacks the effect of alkali on emulsificat...

AI Technical Summary

Problems solved by technology

[0002] Although the ASP ASP flooding technology has achieved good results in field applications in recent years, due to the presence of active components such as strong alkali and surfactant in the ASP composite system, there are different degrees of residual oil in the reservoir and produced fluid. Emulsification, the emulsification in the oil reservoir plays a role in promoting the recovery factor. Due to the decline of production capacity of the ASP ternary composite system, serious emulsification of strong alkali production fluid, corrosion and scaling, etc.

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