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- W2940265355 abstract "Abstract As reservoir pressure decreases with production, the conductivity of hydraulic fractures will also change. These changes in fracture conductivity may impact well productivity significantly, so it is important to investigate the behavior of dynamic fractures. Also, characterzing and forecasting dynamic fracture properties can help with well-spacing design and adjustments in development stategy. This paper proposes a semianalytical model to characterize the behavior of dynamically-closed fractures through pressure buildup test analysis. Time-dependent and space-varying fractures are considered in the modeling process. We note that, although time-dependent fractures are investigated in this study, calculation of variable-rate pressure buildup response is still based on the solution of linear differential equations governing fluid flow in a reservoir. Hence, the convolution theorem can be utilized to deal with the transient pressure buildup data. We recommend a modified exponential function to represent time-normalized fracture conductivity. The representation of dynamic fracture conductivity was handled with a stair-step function, and the fracture-flow model was solved numerically. Pressure buildup responses were obtained by coupling with an analytical matrix-flow model. When fracture conductivity is time-dependent, the pressure drop during the bilinear flow regime will increase. We discuss the effects of fracture conductivity changes and production history on the resulting pressure buildup response. We present a synthetic case study which demonstrates that pressure build-up tests conducted in different years allow us to diagnose changes in fracture conductivity during production history. The results of our interpretations can generate an equation that describes the relationship between fracture conductivity and time. Using the results of multiple pressure buildup test analyses, this method can be applied to forecast fracture characteristics in specific formations of interest." @default.
- W2940265355 created "2019-04-25" @default.
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- W2940265355 date "2019-04-22" @default.
- W2940265355 modified "2023-10-18" @default.
- W2940265355 title "Integrating Multiple Pressure Build-Up Tests to Characterize the Behavior of Dynamically-Closed Fractures" @default.
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- W2940265355 doi "https://doi.org/10.2118/195308-ms" @default.
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