A research on reasonable production rate of strong bottom-water drive reservoirs by horizontal wells:a case of Ng_2 sandbody production in QHD 32-6 oilfield

There are two different patterns to exploit the strong bottom-water drive reservoirs in Bohai oilfields using horizontal wells,i.e.the low-rate production of Ng2 sandbody in QHD32-6 oilfield and the high-rate production of Ng3 sandbody in CFD11-1 oilfield.Based on comparison and analysis of production characteristics and development effects between these two patterns,a development idea to increase the production rate and the ultimate recovery factor by suitbaly enhancing drawdown pressures is proposed for Ng2 sandbody in QHD32-6 oilfield.For Ng2 sandbody,a numerical simulation reservoir model was built,by which the changes in water cut,liquid production,production rate and production degree of the sandbody when exploiting by horizontal wells were researched under different drawdown pressures.By considering the platform`s liquid treatment capability and its life,the reasonable drawdown pressure of horizontal-well production was set at 0.8MPa,for Ng2 sandbody.This idea has been applied in the exploitation of QHD32-6 oilfield,resulting in quite good effects.