Abstract. Internal rock’s structure based on X-ray computed microtomography (CMT) measurement may be used to fluid flow simulation and evaluating of rock’s reservoir properties.
CMT makes it possible to see real pores’ shapes and connections between the pores inrock samples. That’s why simulation based on CMT data is particularly interesting.
Reconstructed structure of pore network allows use of the Navier-Stokes equations to simulate fluid flow through the pores, so the fluid flow is simulated without any experimental data (like it is when Darcy’s law is used) about rock’s porosity and permeability. Moreover, the calculations based on CMT data may lead to estimate permeability of reservoir rocks’ samples without the use of chemical reagents.
After structure reconstruction sample’s image was prepared to simulation by segmentation (phase-mean thresholding), pores’ extraction, filtering and resampling.The fluid flow was simulated in COMSOL Multiphysics 3.5a Earth Science module.Used fluids were nitrogen, propane, water, gasoline and engine oil (fluid parameters were taken from COMSOL material library). Temperature was set to 298 K and external pressure was set to 1013 hPa. The inlet parameter was pressure. The outlet was defined as open boundary without viscous stress. The steady state fluid flow was simulated.
Simulations were performed on 8-core PC (2.66 GHz per each core) with 32 GB RAM.Each simulation took about 0.5 hour.
Simulations showed significant differences between fluids velocities in pore networks.The maximal velocities were decreasing in order: propane, gasoline, water, engine oil.
The higher viscosity of fluid the lower maximal it’s velocity in rock’s pore network.Nevertheless, relative changes of velocities are the same in case of all examined fluids.Calculated permeability values were consistent with results of gas-permeability experiment.
``````
沪公网安备 31011702000137号 
营业执照
微信
新浪微博