Imbibition oil displacement agent and preparation method thereof

Abstract

The invention provides an imbibition oil-displacing agent and a preparation method thereof, the imbibition oil-displacing agent comprises a high-molecular polymerization emulsion and a surfactant solution, and the mass ratio of the surfactant solution to the high-molecular polymerization emulsion is (1.5-9): 1, wherein the high-molecular polymerization emulsion is prepared from the following raw materials: a water-soluble polymer monomer, an emulsifier and an initiator; the surfactant solution comprises a nonionic surfactant and a solvent. Compared with the prior art, the imbibition oil-displacing agent has the beneficial effects that the water-soluble high-molecular polymer emulsion with surface activity is mixed with the surfactant solution, and the nonionic surfactant component in the surfactant solution is loaded on a water-soluble high-molecular polymer skeleton so that the effect of the whole system in a high-salt environment can be ensured, and the mixing ratio of the two is proper so that the oil displacement efficiency of the whole oil displacement agent system reaches 10% or above.

Description

technical field [0001] The invention belongs to the field of petroleum exploitation reagents, and in particular relates to an imbibition oil displacement agent and a preparation method. Background technique [0002] At present, chemical flooding technology is widely used in oil flooding technology at home and abroad. Since the 1980s, polymer flooding technology has been popularized and applied in my country's Shengli Oilfield, Daqing Oilfield, and major oilfields in the west, and achieved good oil displacement effects. However, with the continuous development of major oilfields in China, the reservoir conditions continue to deteriorate, and problems such as increased reservoir heterogeneity and increased salinity of formation water have emerged. Therefore, there is an urgent need to study high-salt-tolerant low-pressure and low-permeability oil displacement agents to meet the needs of enhanced oil recovery in such reservoirs. [0003] Today's common oil displacement agents...

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Problems solved by technology

[0003]Nowadays common oil displacing agents are prepared from common water-soluble high molecular polymer emulsions or compounded with various surfactants. It is difficult to maintain the viscosity of the system in a salty environment, and the latter cannot be in contact with the reservoir matrix for a long time due to its fluidity, resulting in low oil displacement efficiency. Imbibition oil displacement agent is very necessary

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