Injection-production optimization of fault-karst reservoir—considering high-speed non-Darcy effect

Abstract Fault-karst reservoirs are featured by complex geological characteristics, and accurate fast simulation of such kind using traditional simulator methods is pretty hard. Herein, we tried to discrete the fault-karst structures into one-dimensional connected units connecting well, fracture cave based on reservoir static physical parameters injection-production dynamics. Two characteristic parameters, conductivity volume, proposed characterize inter-well connectivity material basis. Meanwhile, high-speed non-Darcy seepage term introduced balance equations for well-fracture-cave describe actual characteristics within reservoirs, better simulate oil/water production Based this method, a model 1 injection-3 was established. The change oil–water action law in different injection extraction systems under two regimes fixed rate pressure analyzed. A case study conducted S fault zone, where flow oil gas did not follow Darcy rule with β value 10 3 –10 4 , single well were perfectly matched real data. In addition, more prominent features found have connectivity, which might shed light prediction connectivity. Moreover, an improved pattern engineering method solve problems insufficient natural energy supply overhigh Block S. Furthermore, injection/production as timing cycle water predicted optimized so guide site operations.