Different distribution behavior of hydrophobic associated polymer AP-P4 between oil-water-solid three-phase system and water-solid two-phase

Abstract：At present, the experiments aimed at studying the adsorption and distribution behavior of hydrophobic associating polymer are confined only to water-solid two-phase system in offshore oilfield. While there is a large number of oil actual existences in reservoir, and no experiment method is conducted to test the distribution behavior of hydrophobic associated polymer in multi-phase system. A set of experimental method has been established for the first time in order to evaluate the distribution of water soluble hydrophobic associated polymer AP-P4 among oil, water and sand based on the static adsorption principle. The distribution law of the AP-P4 polymer in three-phase system under different solution concentration and different salinity conditions can be accurately determinate. The suitable analysis method has been selected to measure the concentration of polymer in oil phase and water phase. By comparison with water-solid two-phase static adsorption result, it showed that the oil-water interface was enriched in hydrophobically associating polymer because of introducing oil phase even though the polymer is not dissolved in the oil phase. Comparing to the conventional two-phase static adsorption method, the newly technique can more comprehensive, more accurately reveals the interaction and mutual influence between the each phase, and contributes to deepen understanding the properties of hydrophobically associating polymer solution. The method also provides theoretical support for predicting the adsorption and retention in actual reservoir chemical flooding process, and evaluating emulsion polymer containing quantity in produced fluid treatment process.