Abstract: In order to solve the problems such as unclear understanding of inter well interference and unclear deployment timing in the combined well pattern development in the heavy oil area at the edge of Bohai Oilfield P at this stage,the plane relative position of horizontal well and directional well,and the timing of horizontal well deployment are studied by using numerical simulation method. The study shows that the inter well interference of the combined well pattern is the largest when the directional well is deployed at the end of the horizontal well;When the directional well is deployed in the middle of the horizontal well,the recovery degree of the block is the largest;For developed reservoirs of directional wells,the lower the water cut is,the greater the cumulative oil production will be increased by deploying horizontal wells to form a combined well pattern. This research method can be used as a reference for other similar oilfield development stages to optimize the deployment of combined well pattern and improve the oilfield development effect.

Key words: heavy oil, combined well pattern, inter well interference, deployment timing, development effect