A kind of polyacrylamide microsphere system and its preparation method and application

Abstract

The invention relates to a microemulsion system and a preparation method, in particular to a polyacrylamide microsphere system, a preparation method and application thereof. The microsphere system is prepared by emulsion polymerization under the action of a composite initiator; the emulsion system includes the following components in terms of mass fraction: 10%~60% monomer; 0.1%~3% Organic salt; 3%~20% emulsifier; 0.01%~2% co-emulsifier; 0.01%~1% crosslinking agent; 0.001%~0.5% initiator; 0.001%~1% polymerization aid ; 10%~70% deionized water; 10%~50% non-polar solvent. As an interface strengthening agent for emulsion flooding, the polymer microsphere system can effectively increase the expansion modulus and shear modulus of the emulsion interface, and improve the stability of the emulsion. Very good mobility control effect, improve the control and displacement ability of emulsion flooding.

Description

technical field

[0001] The invention relates to a microemulsion system and a preparation method, in particular to a polyacrylamide microsphere system, a preparation method and application thereof. Background technique

[0002] Emulsion surfactant flooding is a brand-new oil displacement technology. This oil displacement method can endow the oil displacement system with temperature resistance, salt resistance, emulsification viscosity increase, High-efficiency oil displacement, easy injection, etc., but in the case of relatively high permeability, the strength of the interface film of the emulsion produced by surfactant flooding is not enough, so the emulsion is prone to coalescence and demulsification during the flooding process, resulting in The range of enhanced oil recovery is reduced. Therefore, the research and development of emulsion interface strengthening agents has received more and more attention.

[0003] Chinese invention patent (CN107129585A) discloses a metho...

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