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Pore Network Modelling of Matrix Acidizing of Carbonate Rocks

Khodaiy Arbat, Mohammad | 2020

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 53474 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Jamshidi, Saeed; Masihi, Mohsen
  7. Abstract:
  8. Reactive flow through porous media is a phenomenon of high importance in various study subjects i.e. groundwater, mining, geology, and petroleum reservoirs. In petroleum engineering, a related topic to this phenomenon is the dissolution of the rock matrix due to acidizing. Near_wellbore carbonate rock acidizing has been used for decades in the petroleum industry to enhance the productivity of the well. Optimal injection rate is a key question in such operations. Various models have been used to simulate reactive flow in porous media many of which are continuum-scale that face significant uncertainty regarding the pore-scale nature of the flow, mass transfer, reaction, and subsequent changes in pore morphology. Recently, some researchers have been studied this phenomenon at the pore scale using models like pore network modeling and lattice Boltzmann. In this study, we present a 3D mass-transfer-limited pore network modeling of matrix acidizing of carbonate rocks that benefits some improvements compared with existing ones. Novel formulations are derived to calculate Weibull distribution of pore and throat radii, overall pore-to-pore conductivities, morphologic changes due to dissolution, properties of new throats developed due to dissolution, properties of pores and throats after possible mergings, etc. Convection-diffusion-reaction equation is solved for both pores and throats separately that improves flexibility of model in subsequent calculations. An exact match of optimum Damkohler number with experimental reports (0.29) is determined from this model for the majority of network cases tested. It’s shown that neglecting inter-pore diffusion does not affect the results significantly. Also, it’s shown that banning pore merging and new inter-pore connections during matrix dissolution increases pore volume injected to breakthrough but optimum Domkohler obtained changes imperceptibly
  9. Keywords:
  10. Reservoirs Acidizing ; Pore Network Model ; Acidizing Treatment ; Carbonate Resrevoirs ; Reactive Flow Through Porous Media ; Acidizing Optimization ; Rock Matrix Dissolution ; Matrix Acidizing

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