Laboratory Study of an Anti-Temperature and Salt-Resistance Surfactant-Polymer Binary Combinational Flooding as EOR Chemical

摘要

Experimental studies were conducted to enhance the oil recovery by a surfactant-polymer binary combinational flooding system. The surfactant-polymer binary combinational flooding was obtained by mixing the surfactants with the poly(AM-NVP-AS)-1 which was an anti-temperature and salt-resistance tercopolymer and successfully synthesized via free radical polymerization using acrylamide (AM), N-vinyl pyrrolidone (NVP), allyl sulfonate (AS) as raw materials. The initiator was redox system including watersoluble azo compound (AIBA·2HCl) and sodium bisulfite (NaHSO_3). Petroleum carboxylate dodecyl dibasic carbonylic acid sodium (C12DAS) and carboxyl betaine dodecyl dimethyl betaine (C12DB) were selected in this article. Compared with the surfactant-HPAM, the surfactant-poly(AM-NVP-AS)-1 binary combinational system showed higher apparent viscosity and lower interfacial tension at high temperature and salinity conditions as the result of a better capacity of anti-temperature, salt-resistance, and swept volume. The recovery could enhance over 17% based on the core flooding test under the mineralization of 10,000 mg=L at 65℃.