Changes in productivity wells in bobrikovsky terrigenous of deposits at high Upper Prikamie gas-saturated reservoir oil
When operating Bobrikovsky objects oil fields of the Upper Kama at different periods of the development of a decrease in formation and bottomhole pressure below the saturation pressure, which due to the high gas saturation of reservoir oil, resulted in a significant release of the free phase of dissolved gas. Interest is the question of the degree of influence on the change in the actual productivity index crude oil degassing wells and permeability changes due to strain alone in a bhp below the saturation pressure. In work the range of the parameters that determine the geological and physical characteristics of objects Bobrikovsky Upper Kama. The results of operation of the production wells of the above items at lower reservoir and downhole pressures. It is shown that the degree of reduction factor productivity of oil wells in Bobrikovsky sediment deposits dated to the distribution territory Verkhnekamskoye potash, with a decrease of reservoir and downhole pressure to the saturation pressure of oil increases with increasing gas permeability. It is noted that at lower bhp to the saturation pressure of oil gas productivity index is reduced by 50...60 % of the initial value. Then the estimate of impact on the change in the actual productivity index crude oil degassing and permeability changes due to strain alone in downhole pressures below the saturation pressure. On the example Shershni field shows that the bottom-hole pressure of less than 0.3 of the saturation pressure on factor productivity wells mainly influences the gas released from the oil.