Water Coning, Water, and CO2 Injection in Heavy-Oil Fractured Reservoirs
- Joachim Moortgat (The Ohio State University) | Abbas Firoozabadi (Reservoir Engineering Research Institute)
- Document ID
- Society of Petroleum Engineers
- SPE Reservoir Evaluation & Engineering
- Publication Date
- February 2017
- Document Type
- Journal Paper
- 168 - 183
- 2017.Society of Petroleum Engineers
- CO<sub>2</sub> injection, heavy oil, discrete fracture model, coning, Fickian diffusion
- 11 in the last 30 days
- 329 since 2007
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In this work, we investigate challenges related to the recovery of heavy viscous oil from reservoirs with a dense network of fractures and vugs but with a tight matrix. Gravitational drainage of oil from the tight matrix through water injection is ineffective because of the high oil viscosity and density. To further complicate matters, we consider a strong underlying aquifer, and there is considerable risk of water coning around producing wellbores caused by the low water viscosity. To model potential recovery strategies, we carry out simulations with our higher-order finite-element (FE) compositional multiphase-flow reservoir simulator. Discrete fractures are represented through the crossflow equilibrium (CFE) approach. Phase behavior and phase-split computations are modeled with the cubic-plus-association equation of state (EOS). Fickian diffusion, facilitating species exchange between gas in fractures and matrix oil, is modeled through chemical potential gradients. First, we validate our simulator by modeling a set of laboratory experiments in which water is injected in a fractured stack saturated with oil. The experiments investigate the effects of capillary pressure and injection rates on oil recovery, and show that, at low injection rates, capillary imbibition of water from the fractures into the matrix blocks is extremely efficient. Simulations with our 3D discrete-fracture model show excellent agreement with the experimental results without parameter adjustments. Next, we consider the detrimental effect of water coning when oil is produced without injection by carrying out a parameter study investigating the impacts of different (1) water–oil mobility ratios, (2) matrix and fracture wettabilities, (3) matrix permeabilities, (4) domain sizes, (5) production rates, (6) well types and placement, and (7) a local viscosity-reduction treatment around producing wellbores. We find that the only approach to partially mitigate coning is to produce at low rates from perforated (and potentially multilateral) horizontal wells. As an alternative production strategy, we then model carbon dioxide (CO2) injection in two and three dimensions, and compare to results from a commercial dual-porosity simulator. CO2 has a high solubility in this oil, and dissolution leads to volume swelling and a large reduction in oil viscosity. In combination with the much higher density difference between the phases, the latter improves gravitational drainage. We find that a significant amount of matrix oil can be produced in addition to oil from fractures and vugs, and with a lower risk of water coning.
|File Size||2 MB||Number of Pages||16|
Abass, H. and Bass, D. 1988. The Critical Production Rate in Water-Coning System. Presented at the Permian Basin Oil and Gas Recovery Conference, Midland, Texas, USA, 10–11 March. SPE-17311-MS. http://dx.doi.org/10.2118/17311-MS.
Beveridge, S., Coats, K., and Alexandre, M. 1970. Numerical Coning Applications. J Can Pet Technol 9 (3): 209–215. PETSOC-70-03-07. http://dx.doi.org/10.2118/70-03-07.
Chaney, P., Noble, M., Henson, W. et al. 1956. How to Perforate Your Well to Prevent Water and Gas Coning. Oil Gas J. 55: 108.
Coats, K. 1989. Implicit Compositional Simulation of Single-Porosity and Dual-Porosity Reservoirs. Presented at the 10th SPE Symposium Reservoir Simulation, Houston, 6–8 February. SPE-18427-MS. http://dx.doi.org/10.2118/18427-MS.
Firoozabadi, A. and Thomas, L. 1990. Sixth SPE Comparative Solution Project: Dual-Porosity Simulators. SPE J. 42 (6): 710–763. SPE- 18741-PA. http://dx.doi.org/10.2118/18741-PA.
Firoozabadi, A. and Markeset, T. 1994. Miscible Displacement in Fractured Porous Media: Part I—Experiments. Presented at the SPE/DOE Ninth Symposium of Improved Oil Recovery, Tulsa, 17–20 April. SPE-27743-MS. http://dx.doi.org/10.2118/27743-MS.
Geiger, S., Matthäi, S., Niessner, J. et al. 2009. Black-Oil Simulations for Three-Components, Three-Phase Flow in Fractured Porous Media. SPE J. 14 (2): 338–354. SPE-107485-PA. http://dx.doi.org/10.2118/107485-PA.
Giger, F. M. 1989. Analytic Two-Dimensional Models of Water Cresting Before Breakthrough for Horizontal Wells. SPE Res Eng 4 (4): 409–416. SPE-15378-PA. http://dx.doi.org/10.2118/15378-PA.
Hoteit, H. and Firoozabadi, A. 2005. Multicomponent Fluid Flow by Discontinuous Galerkin and Mixed Methods in Unfractured and Fractured Media. Water Resour. Res. 41 (11). http://dx.doi.org/10.1029/2005WR004339.
Hoteit, H. and Firoozabadi, A. 2006. Compositional Modeling of Discrete-Fractured Media Without Transfer Functions by the Discontinuous Galerkin and Mixed Methods. SPE J. 11 (3): 341–352. SPE-90277-PA. http://dx.doi.org/10.2118/90277-PA.
Hoteit, H. and Firoozabadi, A. 2008. An Efficient Numerical Model for Incompressible Two-Phase Flow in Fractured Media. Adv. Water Resour. 31 (6): 891–905. http://dx.doi.org/10.1016/j.advwatres.2008.02.004.
Jiang, Q. and Butler, R. 1998. Experimental and Numerical Modelling of Bottom Water Coning to a Horizontal Well. J Can Pet Technol 37 (10): 82–91. PETSOC-98-10-02. http://dx.doi.org/10.2118/98-10-02.
Kazemi, H., Merrill, L., Porterheld, K. et al. 1976. Numerical Simulation of Water-Oil Flow in Naturally Fractured Reservoirs. SPE J. 16 (6): 317–326. SPE-5719-PA. http://dx.doi.org/10.2118/5719-PA.
Letkeman, J. and Ridings, R. 1970. A Numerical Coning Model. SPE J. 10 (4): 418–424. SPE-2812-PA. http://dx.doi.org/10.2118/2812-PA.
Lim, K. and Aziz, K. 1995. Matrix-Fracture Transfer Shape Factors for Dual-Porosity Simulators. J. Pet. Sci. Eng. 13: 169–178. http://dx.doi.org/10.1016/0920-4105(95)00010-F.
Lohrenz, J., Bray, B. G., and Clark, C. R. 1964. Calculating Viscosities of Reservoir Fluids From Their Compositions. J Pet Technol 16 (10): 1171–1176. SPE-915-PA. http://dx.doi.org/10.2118/915-PA.
Monteagudo, J. E. P. and Firoozabadi, A. 2007. Control-Volume Model for Simulation of Water Injection in Fractured Media: Incorporating Matrix Heterogeneity and Reservoir Wettability Effects. SPE J. 12 (3): 355–366. SPE-98108-PA. http://dx.doi.org/10.2118/98108-PA.
Moortgat, J. and Firoozabadi, A. 2010. Higher-Order Compositional Modeling With Fickian Diffusion in Unstructured and Anisotropic Media. Adv. in Water Resour. 33 (9): 951–968. http://dx.doi.org/10.1016/j.advwatres.2010.04.012.
Moortgat, J., Li, Z., and Firoozabadi, A. 2012. Three-Phase Compositional Modeling of CO2 Injection by Higher-Order Finite Element Methods With CPA Equation of State for Aqueous Phase. Water Resour. Res. 48: W12511. http://dx.doi.org/10.1029/2011WR011736.
Moortgat, J. and Firoozabadi, A. 2013a. Fickian Diffusion in Discrete-Fractured Media From Chemical Potential Gradients and Comparison to Experiment. Energ. Fuel 27 (10): 5793–5805. http://dx.doi.org/10.1021/ef401141q.
Moortgat, J. and Firoozabadi, A. 2013b. Higher-Order Compositional Modeling of Three-Phase Flow in 3D Fractured Porous Media Based on Cross-Flow Equilibrium. J. Comput. Phys. 250 (0): 425–445. http://dx.doi.org/10.1016/j.jcp.2013.05.009.
Moortgat, J. and Firoozabadi, A. 2013c. Three-Phase Compositional Modeling With Capillarity in Heterogeneous and Fractured Media. SPE J. 18 (6): 1150–1168. SPE-159777-PA. http://dx.doi.org/10.2118/159777-PA.
Moortgat, J., Firoozabadi, A., Li, Z. et al. 2013. CO2 Injection in Vertical and Horizontal Cores: Measurements and Numerical Simulation. SPE J. 18 (2): 331–344. SPE-135563-PA. http://dx.doi.org/10.2118/135563-PA.
Müller, N. 2011. Supercritical CO2-Brine Relative Permeability Experiments in Reservoir Rocks —Literature Review and Recommendations. Transport Porous Media 87 (2): 367–383. http://dx.doi.org/10.1007/s11242-010-9689-2.
Muskat, M. and Wyckoff, R. 1935. An Approximate Theory of Water Coning in Oil Production. Trans., AIME 114: 144–161. SPE-935144-G. http://dx.doi.org/10.2118/935144-G.
Pérez-Martínez, E., Rodríguez de la Garza, F., and Samaniego-Verduzco, F. 2012. Water Coning in Naturally Fractured Carbonate Heavy Oil Reservoir—A Simulation Study. Presented at the SPE Latin America and Caribbean Petroleum Engineering Conference, Mexico City, Mexico, 16–18 April. SPE-152545-MS. http://dx.doi.org/10.2118/152545-MS.
Pooladi-Darvish, M. and Firoozabadi, A. 2000. Experiments and Modeling of Water Injection in Water-Wet Fractured Porous Media. J Can Pet Technol 39 (3): 31–42. PETSOC-00-03-02. http://dx.doi.org/10.2118/00-03-02.
Saffman, P. G. and Taylor, G. 1958. The Penetration of a Fluid Into a Porous Medium or Hele-Shaw Cell Containing a More Viscous Liquid. Pro. Roy. Soc. A 245: 312–329. http://dx.doi.org/10.1098/rspa.1958.0085.
Schols, R. 1972. An Empirical Formula for the Critical Oil Production Rate. Erdoel Erdgas, Z. 88 (1).
Settari, A. and Aziz, K. 1974. A Computer Model for Two-Phase Coning Simulation. SPE J. 14 (3): 221–236. SPE-4285-PA. http://dx.doi.org/10.2118/4285-PA.
Singhal, A. 1996. Water and Gas Coning/Cresting—A Technology Overview. J Can Pet Technol 35 (4): 56–62. PETSOC-96-04-06. http://dx.doi.org/10.2118/96-04-06.
Subramanian, D., Wu, K., and Firoozabadi, A. 2015. Ionic Liquids as Viscosity Modifiers for Heavy and Extra-Heavy Crude Oils. Fuel 143: 519–526. http://dx.doi.org/10.1016/j.fuel.2014.11.051.
Tan, C. and Homsy, G. 1986. Stability of Miscible Displacements in Porous Media: Rectilinear Flow. Phys Fluids 29 (11): 3549–3556. http://dx.doi.org/10.1063/1.865832.
Verga, F., Viberti, D., and Di Renzo, D. 2005. Are Multilateral Wells Really Effective To Control Water Coning? Presented at the SPE Offshore Mediterranean Conference and Exhibition, Ravenna, Italy, 16–18 March . SPE-2005-055-MS. http://dx.doi.org/10.2118/2005-055-MS.
Warren, J. and Root, P. 1963. The Behavior of Naturally Fractured Reservoirs. SPE J. 3 (3): 245–255. SPE-426-PA. http://dx.doi.org/10.2118/426-PA.