Development effect evaluation of medium permeability oil fields in the western Daqing

Longhupao oilfield is a large medium permeability oilfield with the earliest development and the largest area in the western periphery of Daqing. It belongs to a reservoir controlled by lithology and structure. After decades of water injection development, it has entered the development stage of ultra-high water cut stage. The remaining oil is highly dispersed and it is more and more difficult to tap the potential. In order to make the later development adjustment more targeted, it is necessary to evaluate the development effect of the oilfield. Therefore, starting from the field data of the oilfield, this paper comprehensively uses mathematical formula calculation and reservoir engineering methods to evaluate various indexes such as water drive recovery rate, water injection utilization rate, oil production rate, liquid production rate and comprehensive water cut in the current development stage of Longhupao oilfield, The experience of each stage is summarized to provide reference for the formulation of development adjustment strategy in ultra-high water cut period.