Optimization and Adjustment Method of Well Pattern in Three Types of Reservoirs in Ultra-high Water Cut Stage

The well pattern development effect of the three types of reservoirs that have entered the late stage of ultra-high water cut is gradually getting worse, and the inefficient and ineffective wells are gradually increasing. It is necessary to optimize and adjust the well pattern of layer series to improve the development effect. According to the current well pattern, this paper studies the reservoir development, the development status of different well patterns and the adaptability of layer series well pattern combination, and gives the well pattern adjustment methods of three types of reservoirs in the later stage of high water cut in different blocks. This paper summarizes three types of well pattern optimization adjustment methods for three types of reservoirs: 1. For the problems of large well pattern spacing and low control degree in some blocks, infill adjustment is implemented to reduce well spacing; 2. To solve the problems that the adjusted thickness of Class III oil layers in some blocks decreases with the return of Class II oil layers, the original two to three sets of well patterns are mined, and the well spacing is large, and the mining intervals are crossed, the layer series well patterns are merged to improve the injection-production relationship with each other and reduce the well spacing; It is the problem of small well spacing, rapid increase of water cut and small adjustment room of three types of oil layers in some blocks, and well pattern splitting is implemented. Combining with the actual situation, this paper gives the well pattern adjustment modes of three types of oil layers in different blocks at the later stage of high water cut, which has strong guiding significance for the future adjustment of development zones.