厚层边水稠油油藏蒸汽吞吐见水规律研究OA

Aiming at the problem that the rapid rise of water cut in the middle and late stages of the first steam huff and puff cycle of wells in Bohai L Oilfield restricts development efficiency,this study employs numerical simulation and dynamic analysis methods to investigate the influencing factors of water breakthrough time,water breakthrough patterns,and corresponding control countermeasures.The results show that locating wells at a distance of more than 200 m from edge water and controlling the production pressure difference within 5 MPa can reduce the risk of early water breakthrough.Three types of water breakthrough patterns are identified:pressure-sensitive pattern dominated by secondary irreducible water,injection-production interference pattern dominated by injected water,and edge-water breakthrough pattern dominated by edge water.For wells with injection-production interference-type water breakthrough,the water cut can gradually return to a normal level after the completion of heat injection in adjacent wells.As the main type of water breakthrough,the pressure-sensitive pattern can be effectively controlled by increasing the cyclic steam injection volume.This measure increases the peak daily oil production of typical wells by nearly 60％,improving the development effect.The research results provide a reference for improving the development efficiency of similar thick heavy oil reservoirs with active edge water.