In order to explore a method of further enhancing oil recovery after alkaline/surfactant/polymer flooding, taking Xingshugang oilfield in Daqing as an experiment platform and regarding oil recovery, water content and injection pressure as evaluation indicators on enhancing oil recovery, an experiment was conducted under the condition of the constant temperature and constant pressure. The results showed that alkali/surfactant/polymer with strong base system, surfactant polymer system and alkali/surfactant/polymer with weak base system could all further enhance oil recovery, and the effect of high concentration polymer liquor was the best. The greater the subsequent of the injection pressure rose, the more the recovery growth was. Taking into account the constraints of Daqing oilfield reservoir and equipment capacity. Based on the comprehensive consideration of technical and economic effects, aurfactant polymer system has more application prospects.

Hydrophobic associating water  solute polymer has excellent viscosity and salt resistance, but the adaptability between its "mesh" molecular aggregation and reservoir pore throat causes attention of petroleum technology staffs. Aimed at the actual need, gui ding by reservoir engineering, physical chemistry and organic chemistry, the adaptability with hydrophobic associating polymer and experimental effect on southern reservoir were carried out using instrumental analysis, chemical analysis and physical simula tion as technical means. Results showed that with the increasing of β - CD, the viscosity of hydrophobic associating water solute polymer solution first reduced quickly and then got stable. When the concentration of β - CD was 0.07%, hydrophobic association between groups was completely suppressed, and the viscosity of polymer solution was bulk viscosity. In addition, the aggregation size of hydrophobic associating polymer molecular was decreased by β - CD, and the entering extent to reservoir of the polymer molecular group was expanded, thus the adaptability of hydrophobic associating water solute polymer with reservoir was improved.

Molecular aggregation state of saltresistance polymer was changed by intermolecular association, which transparently enhanced its property of saltresistance. However, molecular size was increased while the state of molecular aggregation was changed. Thus the question of worse adaptability between saltresistance polymer and reservoir came out. By means of instrument analysis, chemical analysis and modern physical simulation method, taking reservoir geology, fluids and polymersurfactant agent of Daqing as research platform, regarding polymersurfactant solution viscosity, molecular thread size and seepage characteristics as evaluation index, the research on the adjusting method and effect of the state of molecular aggregation of polymersurfactant agent was carried out. The results showed that βCD could restrain the association of polymersurfactant molecules, thus reduce the size of molecular aggregation of polymersurfactant agent. All this led to the wider range of the permeability that could be flowed through. There existed a best matching relationship between polymersurfactant/βCD and core heterogeneity. On this point, the effect of enlarging sweeping volume of polymersurfactant agent was optimal and recovery efficiency reached a climax. 