New prediction method for transient productivity of fractured five-spot patterns in low permeability reservoirs at high water cut stages

Abstract

Predicting the productivity of fractured five-spot patterns in low permeability reservoirs at high water cut stages has an important significance for the development and optimization of reservoirs. Taking the reservoir heterogeneity and uneven distribution of the remaining oil into consideration, a novel method for predicting the transient productivity of fractured five-spot patterns in low permeability reservoirs at high water cut stages is proposed by using element analysis, the flow tube integration method, and the mass conservation principle. This new method is validated by comparing with actual production data from the field and the results of a numerical simulation. Also, the effects of related parameters on transient productivity are analyzed. The results show that increasing fracture length, pressure difference and reservoir permeability correspond to an increasing productivity. The research provides theoretical support for the development and optimization of fractured five-spot patterns at the high water cut stage.

Investigation of the Combination Mechanism of Spontaneous Imbibition and Water Flooding in Tight Oil Reservoirs Based on Nuclear Magnetic Resonance

“…The four sandstones in the upper sub-member of the 4th member is the interval of interest in this research. displacement phase of water injection, the original oil remains largely stationary, leading to an especially rapid decrease in production [28][29][30][31][32][33]. Acknowledging these difficulties in boosting energy through water injection, some scholars have suggested different methods to increase production [34].…”

“…When water injection occurs at relatively high displacement initiation pressure, the lack of high initial displacement energy fails to notably improve recovery. As a result, during the displacement phase of water injection, the original oil remains largely stationary, leading to an especially rapid decrease in production [28][29][30][31][32][33]. Acknowledging these difficulties in Energies 2024, 17, 742 3 of 18 boosting energy through water injection, some scholars have suggested different methods to increase production [34].…”