Well Pattern and Well Spacing Optimization of Large Volume Water Injection in a Low-Permeability Reservoir with Pressure Sensitivity

Even with the fractured wells, primary oil recovery of low-permeability reservoirs is still poor in Block X Shengli Oilfield. To further enhance recovery, water injected into reservoir. Different from conventional injection scheme, maximum daily rate proposed scheme by Oilfield reaches 2000 m3, and average around 1500 m3. Thus, well spacing certain pattern not suitable for novel scheme. In paper, optimal large volume to develop a pressure-sensitive reservoir investigated. Firstly, CMG employed build basic model developed vertical wells. finely depict pressure sensitivity, dilation-recompaction geomechanical introduced couple model. Based on established coupled model, inverted 5-spot 9-spot investigated total 80 sets numerical experiments. The experiments indicate that 850 m/350 m 550 m/450 m. screen pattern, normalized index production per unit area each proposed. And it found higher than pattern. For wells injection, compared better, corresponding paper proposes an efficient simulation optimization workflow development providing practical guidance sustainable reservoirs.