Evaluation of water-driving characteristics and infilling adjustment effect of Chang 6 reservoir in Area M

The ultra-low permeability reservoir enters the high water cut stage, the distribution of remaining oil is complex, and it is more difficult for the reservoir to stabilize production. Aiming at this problem, infill adjustment is proposed to improve the development effect. In this paper, reservoir engineering, dynamic monitoring, numerical simulation, and horizontal well verification are used to predict the water drive range, thereby laying a foundation for infill adjustment. By evaluating the production decline, formation pressure change, infilling mode, inter-well interference, and recovery change of infill reservoir, 735the following understandings are obtained. (1) After infill adjustment, due to the reduction of well spacing, there will be some interference to the inter-well seepage field. (2) Two oil wells are infilled between lateral oil wells. When the original angle well is converted to injection, the infilling effect is good. (3) The lateral water drive range can be predicted by using various methods. The lateral water drive width is 80−100 m in 10 years of water injection development.