裂缝性礁灰岩油藏开发特征及挖潜对策OA

To improve the development efficiency of fractured reef limestone reservoirs in the L oilfield in eastern South China Sea,based on reservoir development practice,dynamic analysis and numerical simula-tion are used to study the development characteristics,the distribution law of remaining oil,and potential tapping strategies.The results show that the increase in water content and the decrease in production of oil well exhibit a two-stage pattern of first fast and then slow.In the first stage,the water content of the oil well reaches 90%in a short period of time,with an annual decline rate exceeding 25%.In the second stage,the oil well maintains production at an ultra-high water content period for a long time,with an an-nual decline rate of less than 10%,which is the main production contribution stage.The main geological factors affecting the development effect of the oil well are the degree of fracture development,the degree of development of the lower dense layer,and the height of the oil column.The water drive utilization mode in-volves the rapid influx of bottom water along the fracture system into the production well,and the irregular utilization of the matrix system due to strong heterogeneity.The oil drainage radius of the oil well is small,and the remaining oil is mainly distributed between wells.Targeted strategies such as encrypted tapping and dual water control have been proposed.The actual production effect of infiltrating wells is good,and after controlling water,the initial water content of the oil well is reduced by more than 20%,increasing the oil production by more than 50 000 cubic meters.The on-site development practice of oil fields has achieved good results,which can be used as a reference for the development of similar oil reservoirs.