Dispersion Polymerization of Microgel in Aqueous Solution of Ammonium Sulfate and its Oil Displacement Efficiency Study

摘要

Microgel can be used as a novel deep profile control (conformance control) agent in the aspect of EOR(Enhanced oil recovery) in mature oil field development. Dispersion polymerization of microgel has been successfully carried out in aqueous AS (ammonium sulfate) media by using AM (acrylamide), PEG 200 DA (Poly(ethylene glycol(200) diacrylate)), PVP (Poly(vinyl pyrrolidone)), V-50(2,2'-azobis(2-amidino-propane) dihydrochloride), as the monomer, cross-linker, stabilizer and initiator, respectively. The effect of ammonium sulfate and Poly(vinyl pyrrolidone) concentrations are strongly on microgels successfully polymerization. POM and SEM results show that the shape of microgels is in oval or nonspherical state. The surface structure of microgel is rather accidented full of mesoporous. Addition of inorganic salts interacting with poly(acrylamide) microgel can affect its micromorphology and results in the appearance of single crystal clusters. Sand pack flowing experiment shows that the microgel has perfect propagating property during the process of injection and can achieve a high oil recovery efficiency of 23.4% by the total of 0.4 PV microgel solution injection.