关键词: 高含水后期, 多层砂岩油田, 单砂体, 注采关系, 完善程度, 水驱控制程度

Abstract: Aiming at heterogeneous sandstone oilfield with multiple-well pattern and multiple-layer being featured with large amount of oil/water wells,intercrossing between well patterns and with complex injection-production relationship, how to evaluate objectively and accurately single sandbody water-flooding control degree on time is technical assurance for fine analysis in later high water cut stage. Based on fine geologic study and analysis on factors that affect single sandbody injection-production relationship, the evaluation method of improving injection-production relationship in single sandbody is proposed by inspection well data and statistics method in Daqing Oilfield in recent years. This method is featured by uniform criteria, strong objectivity and high accuracy, and provides an effective way to evaluate the potentialities and improved degree of injection-production relationship for single sandbody in multiple-well pattern and multiple-layer oilfield. The good effect has been made by this method in block adjustment, comprehensive treatment, and stimulating wells and layer optimization in Daqing Oilfield.

Key words: later high water cut stage, multiple-layer sandstone oilfield, single sandbody, injection-production relationship, improved degree, water flooding control degree