A kind of weakly cross-linked granular control and drive agent for enhancing oil recovery and its preparation method

Abstract

The invention provides a novel weakly cross-linked particle control and displacement agent capable of enhancing oil recovery and a preparation method thereof. The drive control agent is formed by polymerization of acrylamide monomer and composite crosslinking system through an initiator. Its preparation method is: dissolve 100 parts of acrylamide in 200-250 parts of water to make a solution, dissolve 0.2-0.5 parts of dimethylaminoethyl methacrylate in 30-50 parts of water to make a solution, and dissolve 0.0002-0.001 parts of polyethylene Diol diacrylate is dissolved in 20~40 parts of water to form a solution, which is added to the three-necked bottle in turn, and placed in a water bath at 10°C~15°C; after 30 minutes of nitrogen gas, dissolve 0.01-0.03 parts of ammonium persulfate Add the solution prepared in 30~50 parts of water into the three-necked bottle. After the temperature rise of the reaction solution is greater than 1°C, stop the nitrogen flow. After the reaction, put the three-neck bottle into a water bath at 70-85°C to keep warm for 2-6 hours, then take out the gel, cut it into pieces, dry, pulverize, The powdered product can be obtained after sieving.

Description

technical field [0001] The invention relates to the technical field of tertiary oil recovery, in particular to a weakly cross-linked particle control and displacement agent capable of enhancing oil recovery and a preparation method thereof. Background technique [0002] At present, most oilfields in my country have entered the middle and late stages of secondary recovery. After long-term water injection development, the reservoir geology has become more complicated, and the heterogeneity has become more serious. During the water cut period, the oil saturation has been greatly reduced. Therefore, it is difficult to extract 60-70% of the remaining underground crude oil by means of conventional methods of increasing production and increasing injection. The difficulty of mining technology is becoming more and more difficult, and the economic benefits are getting worse and worse. Tertiary oil recovery technology has become an important means of improving oil recovery. Linear poly...

AI Technical Summary

Problems solved by technology

However, under the conditions of high temperature, high salinity and severe heterogeneity, linear polyacrylamide ages seriously, its viscosity drops sharply, and it has poor adaptability to heterogeneous formations, making it difficult to meet the requirements of enhanced oil recovery; in addition, it can effectively adjust Profile control and water shutoff agent for heterogeneous reservoir permeability, due to high degree of cross-linking, high hardness, poor deformability, difficult to migrate in pores, can not play the role of oil displacement agent

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