Evaluation Of Development Effect Of Block C6 And Studying On Influence Factors Of Wells In Fault Area

In the field of oilfield development,continuous evaluation of development effects is an important means to discover the current problems in development,provide guidance and solutions,and improve the effectiveness of reservoir development.At the same time,in the process of applying fracturing to the development of low-permeability block reservoirs,the degree of influence of the fault orientation,direction of the artificial fracture,and the row direction of the reservoir on the reservoir development effect is not clear.The C6 block development effectiveness evaluation and the influencing factors of well placement in the fault zone were studied.According to the geological characteristics and development characteristics of the low-permeability reservoirs in the peripheral area of Daqing,combined with the low-permeability oilfield development level classification industry standards,four aspects are selected and calculated from the aspects of well injection well pattern,water injection status,development status,and management status.Develop evaluation indicators,and provide corresponding guidance for the development of C6 block based on the evaluation results.The evaluation results show that the recovery rate in C6 zone is 28.42%,the recoverable reserve is 393.91×104t,the average water cut increase rate is 4.01%,the control degree of water flood reserve is 66.3%,the utilization degree of water flooding reserves is 60.9%,and the instantaneous water recovery rate is 4.01.The energy conservation level is 69.45%;the oil recovery rate of the remaining recoverable reserves is 3.46%;the injection well injection rate is 43.9%;the efficiency of the oil and water well measures is 86.2%;the oil well exemption period is 514d;and the oil and water well comprehensive production rate is 75.2%.A grading standard adapted to the development level of low-permeability reservoirs has been formulated,and a comprehensive evaluation of the target block has been made using the fuzzy comprehensive evaluation method and the analytic hierarchy process.By applying the trapezoidal membership distribution function,the monotonically increasing function and monotonically decreasing function membership formulas are obtained,and the single factor evaluation vector and the evaluation matrix are obtained.The final evaluation vector which is Y=(0.2190,0.4843,0.2967)is obtained by fuzzy transformation.Ultimately,the target block development effect is "medium."The oil reservoir numerical simulation method was used to establish an ideal reservoir and well group model near the fault zone.Based on the geological parameters of the C6 zone,the influence of different well row deployment direction and artificial fracture orientation changes on the development effect of the block was studied.The results of the study are as follows:(1)In the five schemes with the angles between 0°,30°,45°,60°,and 90° between row direction and fault orientation,the 0° solution has the best development effect.(2)In the application of row well pattern,the angle between the direction of artificial fracture and well row direction is 0°,30°,45°,60°,and 90°.The 30° development has the best effect.