The Application of Fluid Phase Behavior for Bakken Shale Reservoir

Released on by Yi Chun Zhu
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  • The Application of Fluid Phase Behavior for Bakken Shale Reservoir Book Detail

  • Author : Yi Chun Zhu
  • Release Date : 2021
  • Publisher :
  • Genre :
  • Pages : 0
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  • File Size : 99,99 MB
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The Application of Fluid Phase Behavior for Bakken Shale Reservoir by Yi Chun Zhu PDF Summary

Book Description: Shale gas and oil has been explored and developed in the recent years. Because of its complex pore structure and reservoir characteristics, fluid properties and mechanisms of fluid flow are always difficult but important topics which need to be recognized and described. It is known that properties of fluid in the shale reservoir will be affected by confined environment, and fluid flow in shale reservoir does not always follow Darcy's Law such as turbulent flow in the shale gas reservoir. Consequently, it is a significant study for calculating modified properties and describing fluid flow mechanisms within shale reservoirs. Flash calculation is the first step to characterize reservoir fluid properties because shale reservoir is a multi-phase fluid system. This study primarily considers reservoir as a two-phase system, which includes gas and liquid phases based on the prevailing composition of hydrocarbons in studied shale reservoir formation. Comparing with conventional phase behavior studies for bulk phase fluid, the confined flash calculation for shale reservoir fluids considers the shifts of critical properties of components and the impacts of capillary pressure. It determines the bubble-point pressure and dew point pressure of shale fluids at specific temperatures, composition of gas/liquid phases, and the amount of each phase at equilibrium. The obtained results are compared with those results generated by CMGTM Winprop module (Version 2019.10, Computer Modelling Group Limited, Canada) to verify the accuracy of program from the study. Additionally, with those calculated individual composition in each phase, the assessment of several important properties of fluid such as density, viscosity and compressibility of vapor/liquid phases are performed. Based on the calculated results, critical properties shift and capillary pressure prove to be two important aspects which do affect the flash calculations and physical properties determination. Therefore, they should be considered in flash calculation for shale reservoir fluid at confinement effects. In addition, a case study of transient fluid flow which is influenced by phase behavior and confined effects in the shale formation is developed and solved. Starting from general diffusivity equation, an expression of dimensionless bottomhole pressure of shale gas reservoir with dimensionless time in the scenario of infinite outer boundary and vertical well production is constructed and then solved eventually by using several mathematical approaches (Laplace transform, Fourier transform and Stehfest inversion). Furthermore, within the restricted space, fracture pressures and production rates are calculated in the different pore sizes. Through this study, at the confined space, effects of confinement (critical properties shift and capillary pressure) at the shale reservoir apparently influence flash calculation, phase equilibrium, bubble point and dew point pressures estimation, physical property evaluations of fluid and transient fluid flow analysis.

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