Determination of Irreducible Water Saturation and Its Application in Analysing Water Producing After Fracturing

摘要

Combining semipermeable diaphragm method with nonsteady state method, bound water saturation and critical water saturation in Du 38 District of Daqing Fuyang reservoir are determined before and after fracturing and relationship between them is also analyzed. The results show that the fracture of bound water, have a certain influence critical water saturation, and the cracks of bound water, the greater the size change the greater the value of critical water saturation; Characteristics of reservoir microscopic seepage is analyzed, the results show that the movable water potential changes is the main cause of oil well water after fracturing.