Preparation method of surfactant alkylphenol ether sulfonate used for improving recovery ratio

Abstract

The invention discloses a preparation method of a surfactant, namely alkylphenol ether sulfonate used for improving a recovery ratio. The preparation method comprises the following steps: S1, preparing alkylphenol polyoxyethylene ether, sulfamic acid, sodium alpha-olefin sulfonate, isopropanol and urea; S2, reacting alkylphenol ethoxylates with sulfamic acid at 130-150 DEG C to synthesize alkylphenol polyoxyethylene ether sulfonic acid, and neutralizing the alkylphenol polyoxyethylene ether sulfonic acid with NaOH to generate alkylphenol polyoxyethylene ether sulfonate; and S3, compounding alkylphenol polyoxyethylene ether sulfonate with sodium alpha-olefin sulfonate, isopropanol and urea by utilizing the synergistic effect of surfactants. The surfactant alkylphenol ether sulfonate provided by the invention has good foaming performance, temperature resistance, salt resistance and low interfacial tension, reduces the interfacial tension of stratum sections, effectively improves the wettability and permeability of stratum rocks and the fluidity of crude oil, efficiently strips off rock surface oil films, promotes the smooth recovery of thickened oil, increases a recovery ratio, posesno damage to stratums, realizes automatic elimination of foams and removal of blockage after injection of oil wells is stopped, and has no influence on oil well production.

Description

technical field [0001] The invention relates to the technical field of crude oil exploitation, in particular to a preparation method of surfactant alkylphenol ether sulfonates used for enhancing oil recovery. Background technique [0002] Heavy oil is difficult to exploit due to its high viscosity and low formation temperature. The main methods of heavy oil exploitation are steam huff and puff and steam flooding, which have been exploited in the middle and later stages. In order to improve the quality of steam injection and the effect of steam injection, various surfactants are added during steam injection to enhance oil recovery. Surfactants occupy an important position in oilfield chemicals, especially in the production of heavy oil. One product can be used not only as a high-temperature foaming agent, but also as a high-temperature oil displacement aid. A multifunctional product has Broad application prospects. [0003] The existing high-temperature foaming agent used a...

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Problems solved by technology

[0003] The existing high-temperature foaming agent used as a surfactant for enhanced oil recovery has relatively poor oil displacement and drainage performance, while the high-temperature oil displacement and drainage performance of the high-temperature foaming agent is relatively poor. At the same time, the existing high-temperature foaming The salinity resistance of high-temperature oil displacement aids and drainage aids is poor, so we propose a preparation method for surfactants alkylphenol ether sulfonates for enhanced oil recovery