The Role of Diffusion for Nonequilibrium Gas Injection Into a Fractured Reservoir
- Yannick Yanze (OMV) | Torsten Clemens (OMV)
- Document ID
- Society of Petroleum Engineers
- SPE Reservoir Evaluation & Engineering
- Publication Date
- February 2012
- Document Type
- Journal Paper
- 60 - 71
- 2012. Society of Petroleum Engineers
- 5.4.2 Gas Injection Methods, 5.8.7 Carbonate Reservoir, 2.2.2 Perforating, 4.2 Pipelines, Flowlines and Risers
- Fractured Reservoir, Gas Injection, Diffusion, Gas Oil Gravity Drainage
- 1 in the last 30 days
- 976 since 2007
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The Schönkirchen Tief oil field is located in the Vienna basin in Austria. It is a pervasively fractured dolomite reservoir that has been produced for more than 50 years. The field is at the tail end of production, the wells are perforated close to the top of the reservoir, and water is injected downdip. Because of the location of the field close to one of the main gas pipelines in Austria, it is planned to convert the field into high-performance underground gas storage (UGS).
The field is characterized by a highly permeable fracture system and a less-permeable matrix system. It is expected that some incremental oil can be recovered because of gas/oil gravity drainage from the matrix.
In addition to gas/oil gravity drainage, diffusion will have an effect on the oil recovery. The injected gas is leaner than the equilibrium gas in the reservoir. Hence, gas components diffuse from the fracture system into the matrix and components of the oil diffuse toward the fracture system. This results in a modification of the properties of the oil affected by diffusion.
This type of gas injection results in a zone of decreased oil viscosity for gases such as CO2 and CH4 at the interface of the gas and the oil in the matrix. This zone of lower oil viscosity increases the gas/oil gravity-drainage rates.
The results show that the effect of diffusion can increase cumulative oil production up to 25% compared with a case neglecting the effect of diffusion. The effect of diffusion could be determined for various parameters such as permeability, porosity, fracture spacing, and matrix-block height. While for some of the parameters the effect of diffusion scales with the square root of time (e.g., permeability), for others an exponential relationship has been determined (fracture spacing).
The results derived for the example reservoir can be used more generally to screen whether the effect of diffusion should be incorporated into reservoir studies concerning nonequilibrium-gas injection and to determine how large the error could be in the case where diffusion is neglected.
|File Size||2 MB||Number of Pages||12|
Alavian, S.A. and Whitson, C.H. 2009. Modeling CO2 Injection in a FracturedChalk Experiment. Paper SPE 125362 presented at the SPE/EAGE ReservoirCharacterization and Simulation Conference, Abu Dhabi, UAE, 19-21 October. http://dx.doi.org/10.2118/125362-MS.
Beliveau, D. and Payne, D.A. 1991. Analysis of a Tertiary CO2 Flood Pilot ina Naturally Fractured Reservoir. Paper SPE 22947 presented at the SPE AnnualTechnical Conference and Exhibition, Dallas, 6-9 October. http://dx.doi.org/10.2118/22947-MS.
Blunt, M.J., Fenwick, D.H., and Zhou, D. 1994. What DeterminesResidual Oil Saturation in Three-Phase Flow? Paper SPE 27816 presented at theSPE/DOE Improved Oil Recovery Symposium, Tulsa, 17-20 April. http://dx.doi.org/10.2118/27816-MS.
Burke, W.F. 1960. Simultaneous Underground Gas Storage and Secondary OilRecovery. J Pet Technol 12 (4): 22-26. SPE-1479-G. http://dx.doi.org/10.2118/1479-G.
Clemens, T. and Wit, K. 2001. The Effect of Fracture Spacing on Gas/OilGravity Drainage in Naturally Fractured Reservoirs. Paper SPE 71507 presentedat the SPE Annual Technical Conference and Exhibition, New Orleans, 30September-3 October. http://dx.doi.org/10.2118/71507-MS.
Coats, K.H. 1989. Implicit Compositional Simulation of Single-Porosity andDual-Porosity Reservoirs. Paper SPE 18427 presented at the SPE Symposium onReservoir Simulation, Houston, 6-8 February. http://dx.doi.org/10.2118/18427-MS.
da Silva, F.V. and Belery, P. 1989. Molecular Diffusion in NaturallyFractured Reservoirs: A Decisive Recovery Mechanism. Paper SPE 19672 presentedat the SPE Annual Technical Conference and Exhibition, San Antonio, Texas, USA,8-11 October. http://dx.doi.org/10.2118/19672-MS.
de Kok, J.H. and Clemens, T. 2009. Combined Underground Gas Storage andEnhanced Oil Recovery in a Fractured Reservoir. SPE Res Eval & Eng 12 (6): 943-950. SPE-129745-PA. http://dx.doi.org/10.2118/129745-PA.
Eikmans, H. and Hitchings, V.H. 1999. Using 3D Integrated Modelling toManage the Fractured Natih Field (Oman). Paper SPE 53227 presented at theMiddle East Oil Show and Conference, Bahrain, 20-23 February. http://dx.doi.org/10.2118/53227-MS.
Firoozabadi, A. and Ishimoto, K. 1994. Reinfiltration in Fractured PorousMedia: Part 1--One Dimensional Model. SPE Advanced Technology Series 2 (2): 35-44. SPE-21796-PA. http://dx.doi.org/10.2118/21796-PA.
Grogan, A.T. and Pinczewski, W.V. 1987. The Role of Molecular DiffusionProcesses in Tertiary CO2 Flooding. J Pet Technol 39 (5):591-602. SPE-12706-PA. http://dx.doi.org/10.2118/12706-PA.
Hagoort, J. 1980. Oil Recovery by Gravity Drainage. SPE J. 20 (3): 139-150. SPE-7424-PA. http://dx.doi.org/10.2118/7424-PA.
Hatiboglu, C.U. and Babadagli, T. 2004. Experimental Analysis of Primary andSecondary Oil Recovery From Matrix by Counter-Current Diffusion and SpontaneousImbibition. Paper SPE 90312 presented at the SPE Annual Technical Conferenceand Exhibition, Houston, 26-29 September. http://dx.doi.org/10.2118/90312-MS.
Horie, T., Firoozabadi, A., and Ishimoto, K. 1990. Laboratory Studiesof Capillary Interaction in Fracture/Matrix Systems. SPE Res Eng 5 (3): 353-360. SPE-18282-PA. http://dx.doi.org/10.2118/18282-PA.
Johnston, J.R. 1988. Weeks Island Gravity Stable CO2 Pilot. Paper SPE 17351presented at the SPE/DOE Enhanced Oil Recovery Symposium, Tulsa, 17-20 April.http://dx.doi.org/10.2118/17351-MS.
Karimaie, H., Darvish, G.R., Lindeberg, E., and Torsæter, O. 2007.Experimental Investigation of Secondary and Tertiary Gas Injection in FracturedCarbonate Rock. Paper SPE 107187 presented at the EUROPE/EAGE Conference andExhibition, London, 11-14 June. http://dx.doi.org/10.2118/107187-MS.
Kazemi, A. and Jamialahmadi, M. 2009. The Effect of Oil and Gas MolecularDiffusion in Production of Fractured Reservoir During Gravity DrainageMechansim by CO2 Injection. Paper SPE 120894 presented at the EUROPEC/EAGEConference and Exhibition, Amsterdam, 8-11 June. http://dx.doi.org/10.2118/120894-MS.
Labastie, A. 1990. Capillary Continuity Between Blocks of a FracturedReservoir. Paper SPE 20515 presented at the SPE Annual Technical Conference andExhibition, New Orleans, 23-26 September. http://dx.doi.org/10.2118/20515-MS.
Langenberg, M.A., Henry, D.M., and Chlebana, M.R. 1995. Performance andExpansion Plans for the Double-Displacement Process in the Hawkins Field Unit.SPE Res Eng 10 (4): 301-308. SPE-28603-PA. http://dx.doi.org/10.2118/28603-PA.
Le Romancer, J.-F.X. and Fernandes, G. 1994. Mechanism of Oil Recovery byGas Diffusion in Fractured Reservoir in Presence of Water. Paper SPE 27746presented at the SPE/DOE Improved Oil Recovery Symposium, Tulsa, 17-20 April.http://dx.doi.org/10.2118/27746-MS.
Lenormand, R., Le Romancer, J.F., Le Gallo, Y., and Bourbiaux, B.1998. Modeling the Diffusion Flux Between Matrix and Fissure in a FissuredReservoir. Paper SPE 49007 presented at the SPE Annual Technical Conference andExhibition, New Orleans, 27-30 September. http://dx.doi.org/10.2118/49007-MS.
Moortgat, J., Firoozabadi, A., Li, Z., and Espósito, R. 2010.Experimental Coreflooding and Numerical Modeling of CO2 Injection With Gravityand Diffusion Effects. Paper SPE 135563 presented at the SPE Annual TechnicalConference and Exhibition, Florence, Italy, 19-22 September. http://dx.doi.org/10.2118/135563-MS.
Morel, D., Bourbiaux, B., Latil, M., and Thiebot, B. 1993. Diffusion Effectsin Gasflooded Light-Oil Fractured Reservoirs. SPE Advanced TechnologySeries 1 (2): 100-109. SPE-20516-PA. http://dx.doi.org/10.2118/20516-PA.
Novinpour, F., Sobbi, F.A., and Badakhshan, A. 1994. Modeling thePerformance of an Iranian Naturally Fractured Reservoir. Paper CIM 94-02presented at the 45th Annual Meeting of the Petroleum Society of CIM, Calgary,12-15 June.
O'Neill, N. 1988. Fahud Field Review: A Switch from Water to Gas Injection.J Pet Technol 40 (5): 609-618. SPE-15691-PA. http://dx.doi.org/10.2118/15691-PA.
Ren, W., Bentsen, R., and Cunha, L.B. 2003. Pore-Level Observation ofGravity Assisted Tertiary Gas-Injection Processes. Paper SPE 81007 presented atthe SPE Latin American and Caribbean Petroleum Engineering Conference,Port-of-Spain, Trinidad, 27-30 April. http://dx.doi.org/10.2118/81007-MS.
Saidi, A.M. 1975. Mathematical simulation model describing Iranian fracturedreservoirs and its application to Haft-Kel field. Proc., 9th WorldPetroleum Congress, Tokyo, 11-16 May, 209-213.
Saidi, A.M. 1996. Twenty Years of Gas Injection History into Well-FracturedHaft Kel Field (Iran). Paper SPE 35309 presented at the International PetroleumConference and Exhibition of Mexico, Villahermosa, Mexico, 5-7 March. http://dx.doi.org/10.2118/35309-MS.
Saidi, A.M., Tehrani, D.H., and Wit, K. 1979. Mathematical Simulationof Fractured Reservoir Performance, Based on Physical Experiments.Proc., 10th World Petroleum Congress, Bucharest, Romania, 9-14September, Vol. 3, 225-233.
Spivak, A., Karaoguz, D., Issever, K., and Nolan, J.S. 1989.Simulation of Immiscible CO2 Injection in a Fractured Carbonate Reservoir, BatiRaman Field, Turkey. Paper SPE 18765 presented at the SPE California RegionalMeeting, Bakersfield, California, USA, 5-7 April. http://dx.doi.org/10.2118/18765-MS.
Thiebot, B.M. and Sakthikumar, S.S. 1991. Cycling Fractured ReservoirsContaining Volatile Oil: Laboratory Investigation of the Performance of LeanGas or Nitrogen Injection. Paper SPE 21427 presented at the Middle East OilShow, Bahrain, 16-19 November. http://dx.doi.org/10.2118/21427-MS.
Torabi, F. and Asghari, K. 2009. Effect of Connate-Water Saturation, OilViscosity, and Matrix Permeability on Rate of Gravity Drainage duringImmiscible and Miscible Displacement Tests in Matrix-Fracture ExperimentalModel. Paper CIPC 2009-169 presented at the Canadian International PetroleumConference, Calgary, 16-18 June. http://dx.doi.org/10.2118/2009-169.
Uleberg, K. and Høier, L. 2002. Miscible Gas Injection in FracturedReservoirs. Paper SPE 75136 presented at the SPE/DOE Improved Oil RecoverySymposium, Tulsa, 13-17 April. http://dx.doi.org/10.2118/75136-MS.
Verlaan, M. and Boerrigter, P.M. 2006. Miscible Gas/Oil Gravity Drainage.Paper SPE 103990 presented at the First International Oil Conference andExhibition in Mexico, Cancun, Mexico, 31 August-2 September. http://dx.doi.org/10.2118/103990-MS.
Wit, K., Clemens, T., and Rijkels, L. 2002. Simulation of Gas/Oil GravityDrainage in a Stack of Interacting Blocks: Pseudo Relations for a LimitedNumber of Gridblocks. Paper SPE 77722 presented at the SPE Annual TechnicalConference and Exhibition, San Antonio, Texas, USA, 29 September-2 October. http://dx.doi.org/10.2118/77722-MS.