Numerical simulation study of the effect of interlayer parameters on water injection in bottom water reservoir——by taking A oil reservoir in Bohai as an example

Based on the actual development parameters of A oil reservoir in Bohai,through the establishment of numerical model of bottom water reservoir with interlayer,the influence of interlayer parameters on water flooding development effect is studied by using the data of recovery degree curve and water cut rise rate curve after water flooding.The results show that the length,width and height of the interlayer are the main factors affecting the water injection effect,while the height and permeability of the interlayer are the secondary factors.The greater the ratio of interlayer length,the better the effect of water injection is.The smaller the ratio of interlayer height,the better the effect of water injection is.Based on the locally developed interlayer of A oil reservoir,the field test and simulation are carried out by using the numerical model.It is predicted that after water injection of well A30 H2,the oil increase of A oil reservoir is 4.5×10~4 m~3,and the increased recovery factor of well group is 1.2%.