A kind of gemini composite surfactant for oil displacement and preparation method thereof

Abstract

The invention discloses a Gemini composite surfactant for oil displacement and a preparation method of the Gemini composite surfactant and belongs to the technical field of surfactants. The Gemini composite surfactant is prepared from components in parts by weight as follows: 28-33 parts of a Gemini surfactant, 1.2-1.8 parts of lauryl sodium sulfate, 4.6-5.5 parts of 1,3-propanesultone, 15-22 parts of Span 80, 6.8-7.7 parts of isopropyl alcohol, 13-18 parts of 2-(2-[4-(1,1,3,3-tetramethylbutyl)phenoxy]ethoxy)ethanol, 10.2-11.5 parts of acetone, 3.5-4.4 parts of a heat resistant agent, 5.2-6.6parts of an enhancer, 5.8-6.3 parts of an auxiliary, 3.3-4.8 parts of polyvinyl alcohol, 4.3-5.4 parts of dodecylbenzene sulfonic acid and 23-28 parts of water. The Gemini composite surfactant for oildisplacement has excellent comprehensive performance, can remarkably reduce surface tension and is good in surface activity and oil displacement efficiency, and recovery efficiency of crude oil is improved.

Description

technical field [0001] The invention relates to the technical field of surfactants, in particular to a Gemini composite surfactant for oil displacement and a preparation method thereof. Background technique [0002] For ordinary oil reservoirs, there are large-scale products of surfactant oil displacement agents, and ideal effects have been achieved in enhancing oil recovery. However, with the development of oil exploration in the direction of low permeability, deep wells and complex and difficult conditions, mining is also developing in the direction of high temperature, high salt and low permeability. The successful application of surfactants in ordinary oil reservoirs, under the conditions of high temperature and high salinity, due to the easy change of the structure of the chemical agent, the existing oil displacement agents cannot achieve the desired effect, which limits the development of oil. [0003] At present, in oil extraction, the commonly used surfactants are p...

AI Technical Summary

Problems solved by technology

However, the invention has poor long-term temperature and salt resistance stability, and is easily affected by the reservoir environment. In the actual oil displacement process, the flow is slow, the oil displacement efficiency is low, and the water solubility and foaming performance are relatively poor, which affects the oil displacement effect.