Alkyl-polyethoxy-sodium naphthalenesulfonate foam oil displacement agent and its preparation method

Abstract

The application discloses an alkyl-polyethoxy-naphthalenesulfonate sodium foam agent flooding and a preparation method thereof, belonging to the technical field of tertiary oil recovery. The method comprises: adding naphthalene and concentrated sulfuric acid into a reactor, heating up to a first reference temperature, feeding ethylene oxide under stirring, and reacting for 2-4h to obtain a first reaction product; The temperature is lowered to the second reference temperature, olefins are added to continue the reaction for 2-3 hours, and the pH value is adjusted by a pH regulator to obtain the alkyl-polyethoxy-naphthalenesulfonate sodium foaming agent. The application improves the stability of the foam oil displacement agent, has excellent foam stabilizing performance, and improves the oil resistance of the foam oil displacement agent. Since the olefin group is a lipophilic group, the oil-water balance of the foam oil displacement agent is balanced, and the foam oil displacement agent is improved. The foaming ratio of the oil displacing agent.

Description

Alkyl-polyethoxy-sodium naphthalene sulfonate foam oil displacing agent and preparation method thereof technical field The application relates to tertiary oil recovery technical field, particularly a kind of alkyl-polyethoxy-sodium naphthalene sulfonate foam flooding agent and its preparation method. Background technique There is a large amount of low-permeability, high water-cut heavy oil reservoirs in my country at present, and gas flooding is to improve recovery factor for above-mentioned oil fields However, the above-mentioned oil reservoirs have a large number of fractures due to complex formation structures and fracturing operations. Therefore, by Excessive gas flooding will cause problems such as gas channeling in oil wells, resulting in a decrease in the oil displacement effect. Foam flooding as an important part in tertiary oil recovery The oil displacement method has been widely used in the fields of profile control, water plugging and oil displacement in...

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Problems solved by technology

[0006] The embodiment of the present application provides an alkyl-polyethoxy-naphthalene sodium sulfonate foam oil displacement agent and its preparation method, which can solve the problem that high-temperature foam is difficult to stabilize in the related art, resulting in a short half-life of the foam, which seriously restricts foam flooding. Practical Application Issues in High Temperature Reservoirs

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