(772d) Assignment and Calibration of Relative Permeability By Hydrostratigraphic Units: A Novel Approach for Multiphase Flow Analyses; Case Study Example: CO2-EOR Operations at the Farnsworth Unit, Texas
We applied a novel approach to assigning relative permeability relationships in numerical models. In previous research, most models assign relative permeability functions on the basis of geologic formation or rock type. In this study, we assign and calibrate relative permeability by hydrostratigraphic units, extending the seminal work of Maxey (1964) to multiphase flow. Ongoing work by the SWP has identified distinct regions that are believed to exhibit similar flow characteristics using the Improved Hydraulic Flow Units (IHFU) method. Core from each of these flow regions are being scanned by micro-computer-tomography (micro-CT) and relative permeability testing will be completed when the scans are finished. Specific, calibrated relative permeability relationships will be assigned to each hydrostratigraphic unit. Results of forward simulations with the newly-calibrated models will be compared to those of existing models that utilize a single relative permeability relationship for the whole model domain.
The study site is the Farnsworth Unit (FWU) in the northeast Texas Panhandle, an active CO2-EOR operation. The target formation is the Morrow âBâ Sandstone, a clastic formation composed of medium to course sands. The study was undertaken as part of the Southwest Regional Partnership on Carbon Sequestration (SWP) under the phase III project.