Oil-displacing agent capable of forming nano-film and preparation thereof

Abstract

Disclosed is oil displacement agent which can form nanometer film which is prepared through the polymerization of initiator, auxiliary initiator, complexing agent, promoter, distilled water and polymeric monomer composed of acrylamide AM, cross linking agent monomer NAM and cationic monomer DMDAAC; the oil displacement agent is characterized in that the weight ratio is that the monomer: initiator: auxiliary initiator: complexing agent: promoter: distilled water is equal to 30: 0.005: 0.008: 0.1-0.2: 0.5-1: 68.787-69.387. The preparation method is that the raw materials are mixed according to the weight ratio that the polymeric monomer: initiator: auxiliary initiator: complexing agent: promoter: distilled water is equal to 30: 0.005: 0.008: 0.1-0.2: 0.5-1: 68.787-69.387; ammonia is used to adjust the pH value to 7-8; the mixture is put into the reaction kettle; the reaction is under normal pressure; the initial temperature is 10-15 DEG C and the temperature lasts for 30 minutes; when the viscosity is increased, the temperature is increased to 40 DEG C for the second initiation reaction and the temperature lasts for 5-8 hours, and then the oil displacement product which can form the nanometer film is obtained after drying and granulation.

Description

1. Technical field [0001] The invention relates to a nano-membrane oil-displacing agent suitable for the application of oil recovery technology after polymer flooding and its application technology, in particular to an oil-displacing agent forming a nano-membrane and a preparation method, belonging to the field of tertiary oil recovery in oil field development. 2. Background technology [0002] Polymer flooding is a highly popularized tertiary oil recovery method. Polymer flooding mainly improves the horizontal and vertical sweep coefficients of injected water by increasing the viscosity of the water phase and reducing the water-oil mobility ratio, thereby enhancing oil recovery. Taking the Gudao Oil Production Plant of Shengli Oilfield as an example, Gudao Oilfield conducted a pilot polymer flooding test in Hall 3 of Zhongyi District in 1992, and the effect of precipitation and oil increase was obvious. By December 2006, the main water flooding unit of Gudao Oilfield was gr...

AI Technical Summary

Problems solved by technology

Second, after the formation of high-permeability zone or channeling channel, the polymer retained in the oil layer breaks into the oil well along the high-permeability zone, causing the polymer solution to finger or escape and to be produced with the oil well production fluid, which reduces the cost of polymer flooding. Subsequent effective period (the total effective time of polymer flooding can reach 10 years)

[0003] At present, there are roughly three kinds of development technologies for further enhancing oil recovery after polymer flooding at home and abroad: one is to use conventional water flooding, the other is to use binary compound flooding composed of polymer and surfactant system, and the third is to use polymer flooding. The ASP flooding system composed of material plus surfactant and alkali has strong pertinence in terms of oil displacement mechanism, operation method and follow-up treatment, and its economic benefits are poor