关键词: 聚合物驱, 相对分子质量, 浓度, 过孔能力, 油层, 配伍性

Abstract: Polymer-flooding is one of the tertiary oil production technology dominated by Daqing Oilfield. To ensure the flooding viscosity under the condition of diluted sewage, the polymer solution with a concentration of 2000mg/L or even a higher concentration was used on the field. Although good development results were achieved on some blocks, a series of problems propped up, such as difficult injection and high consumption of polymer. The study of the polymer compatibility with oil reservoir made in recent years are basically focused on the compatibility between the relative molecular quality of polymer and the permeability of oil reservoir so that the conclusion from the study is inadequate to explain the on-the-field problems. This study uses micro pore filtration unit to simulate the size of oil formation throats under the condition of formation pressure and tests the through-pore abilities of polymer solutions with different parameters. Then the hydraulic dynamic size of polymer solution is determined in the polymer-flooding technology plan and dynamic adjustment to match the throat radius, which are found from mercury intrusion curves of different oil formations and formulate the injection parameters and the model plate for compatibility with oil reservoir, bringing about a unified standard for appraisal of polymer injection capability.

Key words: polymer-flooding; relative molecular quality; concentration; through-pore capability; oil reservoir; compatibility