科研之友
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摘要
Tight sandstone gas reservoirs have large differences in physical properties and their uncertainty seriously restricts the stable production and efficient development of gas reservoirs. In order to effectively develop the unutilized reserves of tight sandstone gas reservoirs and improve gas production and recovery, it is necessary to optimize well pattern density of tight sandstone gas reservoirs with complex reservoir conditions. By analyzing the effects of seven reservoir physical parameters on single well dynamic control area, including permeability, porosity, effective thickness, water saturation, threshold pressure gradient, productivity coefficient and storage capacity coefficient, the relationship between reservoir physical parameters and single well dynamic control area without interference between wells is inferred by using fuzzy mathematics method. The calculated fuzzy prediction value of the single well dynamic control area is compared with the geological well control area to determine whether there will be interference between wells after the well pattern is encrypted under different reservoir physical conditions, and the interference probability curve that changes with the well pattern density is obtained. Furthermore, a recovery evaluation model is constructed based on the inter-well interference probability, which is applied in Su 6 well area. The results show that using the new evaluation method for tight sand-stone gas reservoirs, the average cumulative gas production per well and recovery evaluated through the physical properties of the reservoir are consistent with the actual production dynamics results. Under certain conditions, this method is reasonable and reliable. The new method of recovery evaluation provides new ideas for well pattern optimization of tight sandstone gas reservoirs.
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