Finite Element Modeling of Casing in Gas-Hydrate-Bearing Sediments
- Manoochehr Salehabadi (Heriot-Watt University) | Min Jin (Heriot-Watt University) | Jinhai Yang (Heriot-Watt University) | Hooman Haghighi (Heriot-Watt University) | Rehan Ahmed (Heriot-Watt University) | Bahman Tohidi (Heriot-Watt University)
- Document ID
- Society of Petroleum Engineers
- SPE Drilling & Completion
- Publication Date
- December 2009
- Document Type
- Journal Paper
- 545 - 552
- 2009. Society of Petroleum Engineers
- 1.14.3 Cement Formulation (Chemistry, Properties), 5.3.4 Integration of geomechanics in models, 1.6 Drilling Operations, 5.2 Reservoir Fluid Dynamics, 5.2.1 Phase Behavior and PVT Measurements, 1.11 Drilling Fluids and Materials, 5.3.1 Flow in Porous Media, 1.2.3 Rock properties, 1.2.2 Geomechanics, 4.1.5 Processing Equipment, 4.3 Flow Assurance, 1.14 Casing and Cementing, 4.6 Natural Gas, 4.1.2 Separation and Treating, 5.9.1 Gas Hydrates, 4.3.1 Hydrates
- deep offshore, gas hydrate bearing sediments, finite element, drilling, wellbore integrity
- 2 in the last 30 days
- 1,029 since 2007
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Casing integrity in shallow marine sediments could be challenging if natural gas hydrates exist in the sediments. Elevated wellbore temperature during drilling of deeper sections of deep offshore wells can cause in-situ gas hydrates to dissociate, thereby increasing pore pressure and altering the mechanical properties of the sediments. Gas hydrate can also dissociate during setting and/or cementing, causing gas release, which could result in delaying completion of the wellbore because of the flow of gas around the casing (conductor pipe) or affecting the casing integrity or casing stability by creating voids (channels) in the cement sheath leading to nonuniform stress loadings.
In this communication, a numerical model is developed using a finite-element code to simulate the stability of casing in gas-hydrate-bearing sediments by considering the interaction between the formation, the casing, and the cement with coupling the thermodynamic stability of the hydrates to hydraulic, mechanical, and heat transfer terms. The mechanical and hydraulic terms are fully coupled and the coupling between mechanical and thermal terms is modeled through staggered technique (one-way coupling).
To model the worst-case scenario, the permeability of gas-hydrate-bearing sediments is assumed very low; as a result, the gas and water generated during gas-hydrate dissociation cannot flow and will increase pore pressure. The mechanical property degradation of formation caused by hydrate dissociation is represented in the model by cohesion softening as a function of dissociated gas hydrate saturation.
The developed numerical model is found to be very useful in understanding the behavior of wellbores drilled in gas-hydrate-bearing sediments, which will help the determination of the resultant stress fields and enable a more accurate determination of the required casing strength.
|File Size||511 KB||Number of Pages||8|
Abaqus Version 6.7 User's Manual. 2007. SIMULIA, http://www.simulia.com/support/documentation.html.
Ahmadi, G., Ji, C., and Smith, D.H. 2007. Natural gas productionfrom hydrate dissociation: An axisymmetric model. Journal of PetroleumScience and Engineering 58 (1-2): 245-258.doi:10.1016/j.petrol.2007.01.001.
Berger, A., Fleckenstein, W.W., Eustes, A.W., and Thonhauser, G. 2004. Effect of Eccentricity, Voids, CementChannels, and Pore Pressure Decline on Collapse Resistance of Casing. PaperSPE 90045 presented at the SPE Annual Technical Conference and Exhibition,Houston, 26-29 September. doi: 10.2118/90045-MS.
Birchwood, R., Noeth, S., Hooyman, P., and Winters, W. 2005. WellboreStability Model for Marine Sediments Containing Gas Hydrates. PaperAADE-05-NTCE-13 presented at the AADE National Technical Conference andExhibition, Houston, 5-7 April.
Bosma, M.G.R., Cornelissen, E.K., and Schwing, A. 2000. Improved ExperimentalCharacterization of Cement/Rubber Zonal Isolation Materials. Paper SPE64762 presented at the International Oil and Gas Conference and Exhibition inChina, Beijing, 7-10 November. doi: 10.2118/64762-MS.
Callister, W.D. Jr. 2007. Material Science and Engineering: AnIntroduction, seventh edition. New York: John Wiley & Sons.
Fleckenstein, W.W., Eustes, A.W., and Miller, M.G. 2000. Burst Induced Stresses in CementedWellbores. Paper SPE 62596 presented at the SPE/AAPG Western RegionalMeeting, Long Beach, California, USA, 19-23 June. doi: 10.2118/62596-MS.
Fleckenstein, W.W., Eustes, A.W., Rodriguez, W.J., Berger, A., and Sanchez,F.J. 2005. Cemented Casing: The True Stress Picture. Paper AADE-05-NTCE-14presented at the AADE National Technical Conference and Exhibition, Houston,5-7 April.
Freij-Ayoub, R., Clennell, B., Tohidi, B., Yang, J., and Hutcheon, R. 2007b.Casing Integrity in Hydrate Bearing Sediments. Presented at the 6thInternational Conference on Offshore Site Investigation and Geotechnics,London, 11-13 September.
Freij-Ayoub, R., Tan, C., Clennell, B., Tohidi, B., and Yang, J. 2007a. A wellbore stabilitymodel for hydrate bearing sediments. Journal of Petroleum Science andEngineering 57 (1-2): 209-220.doi:10.1016/j.petrol.2005.10.011.
Gray, K.E., Podnos, E., and Becker, E. 2009. Finite-Element Studies ofNear-Wellbore Region During Cementing Operations: Part 1. SPE Drill& Compl 24 (1): 127-136. SPE-106998-PA. doi:10.2118/106998-PA.
Helgerud, M.B., Dvorkin, J., and Nur, A. 2000. Rock Physics Characterizationfor Gas Hydrate Reservoirs Elastic Properties. In Gas Hydrates: Challengesfor the Future, ed. G.D. Holder and P.R. Bishnoi, Vol. 912. New York:Annals, New York Academy of Sciences.
Kim, H.C., Bishnoi, P.R., Heidemann, R.A., and Rizvi, S.S.H. 1987. Kinetics of methanehydrate decomposition. Chemical Engineering Science 42(7): 1645-1653. doi:10.1016/0009-2509(87)80169-0.
Kimoto, S., Oka, F., Fushita, T., and Fujiwaki, M. 2007. Achemo-thermo-mechanically coupled numerical simulation of the subsurface grounddeformations due to methane hydrate dissociation. Computers andGeotechnics 34 (4): 216-228.doi:10.1016/j.compgeo.2007.02.006.
Klar, A. and Soga, K. 2005. Coupled Deformation-Flow Analysis for MethaneHydrate Production by Depressurized Wells. Proc., 3rd Biot Conference onPoromechanics, Norman, Oklahoma, 24-27 May, 652-659.
Kowalsky, M.B. and Moridis, G.J. 2007. Comparison of kineticand equilibrium reaction models in simulating gas hydrate behavior in porousmedia. Energy Conversion and Management 48 (6):1850-1863. doi:10.1016/j.enconman.2007.01.017.
Matson, B.G., Whitfield, M.A., and Dysart, G.R. 1967. Computer Calculations of Pressure andTemperature Effects on Length of Tubular Goods During Deep WellStimulation. J. Pet Tech 19 (4): 551-558;Trans., AIME, 240. SPE-1559-PA. doi: 10.2118/1559-PA.
Mendes, R.B., Coelho, L.C., Guigon, J., Cunha, G.G., King, V.P.S., andLandau, L. 2005. AnalyticalSolution for Transient Temperature Field Around a Cased and CementedWellbore. Paper SPE 94870 presented at the SPE Latin American and CaribbeanPetroleum Engineering Conference, Rio de Janeiro, 20-23 June. doi:10.2118/94870-MS.
Moridis, G.J. 2002. NumericalStudies of Gas Production from Methane Hydrates. Paper SPE 75691 presentedat the SPE Gas Technology Symposium, Calgary, 30 April-2 May. doi:10.2118/75691-MS.
Moridis, G.J. and Kowalsky, M.B. 2006. Response of Oceanic Hydrate-BearingSediments to Thermal Stresses. Paper OTC 18193 presented at the OffshoreTechnology Conference, Houston, 1-4 May. doi: 10.4043/18193-MS.
Philippacopoulos, A.J. and Berndt, M.L. 2002. Mechanical Response andCharacterization of Well Cements. Paper SPE 77755 presented at the SPEAnnual Technical Conference and Exhibition, San Antonio, Texas, USA, 29September-2 October. doi: 10.2118/77755-MS.
Robert, E.S. 1979. GeothermalWell Completions: A Critical Review of Downhole Problems and SpecializedTechnology Needs. Paper SPE 8211 presented at the SPE Annual TechnicalConference and Exhibition, Las Vegas, Nevada, USA, 23-26 September. doi:10.2118/8211-MS.
Rutqvist, J. and Moridis, G.J. 2007. Numerical Studies on theGeomechanical Stability of Hydrate-Bearing Sediments. Paper OTC 18860presented at the Offshore Technology Conference, Houston, 30April-3May. doi:10.4043/18860-MS.
Rutqvist, J., Borgesson, L., Chijimatsu, M., Kobayashi, A., Jing, L.,Nguyen, T.S., Noorishad, J., and Tsang, C.-F. 2001. Thermohydromechanics ofpartially saturated geological media: governing equations and formulation offour finite element models. International Journal of Rock Mechanics andMining Sciences 38 (1): 105-127.doi:10.1016/S1365-1609(00)00068-X.
Smith, M.A., Kou, W., Ahmed, A., and Kuzela, R. 2005. The Significance of Gas Hydrate as aGeohazard in Gulf of Mexico Exploration and Production. Paper OTC 17655presented at the Offshore Technology Conference, Houston, 2-5 May. doi:10.4043/17655-MS.
Swinkels, W.J.A.M. and Drenth, R.J.J. 2000. Thermal Reservoir Simulation Model ofProduction from Naturally Occurring Gas Hydrate Accumulations. SPE ResEval & Eng 3 (6): 559-566. SPE-68213-PA. doi:10.2118/68213-PA.
Tan, C.P., Freij-Ayoub, R., Clennell, M.B., Tohidi, B., and Yang, J. 2005.Managing Wellbore Instability Riskin Gas-Hydrate-Bearing Sediments. Paper SPE 92960 presented at the SPE AsiaPacific Oil and Gas Conference and Exhibition, Jakarta, 5-7 April. doi:10.2118/92960-MS.
Thiercelin, M.J., Dargaud, B., Baret, J.F., and Rodriguez, W.J. 1997. Cement Design Based on CementMechanical Response. Paper SPE 38598 presented at the SPE Annual TechnicalConference and Exhibition, Texas, 5-8 October. doi: 10.2118/38598-MS.
Tohidi, B., Danesh, A., and Todd, A.C. 1995. Modelling Single and MixedElectrolyte-Solutions and Its Applications to Gas Hydrates. Chem. Eng. Res.Design 73 (A4): 464-472.
Xu, W. and Germanovich, L.N. 2006. Excess pore pressure resultingfrom methane hydrate dissociation in marine sediments: A theoreticalapproach. J. Geophys. Res. 111: B01104. doi:10.1029/2004JB003600.
Yousif, M.H, Abass, H.M., Selim, M.S., and Sloan, E.D. 1991. Experimental and TheoreticalInvestigation of Methane-Gas-Hydrate Dissociation in Porous Media. SPERes Eng 6 (1): 69-76. SPE-18320-PA. doi: 10.2118/18320-PA.
Yousif, M.H, Li, P.M, Selim, M.S., and Sloan, E.D. 1990. Depressurization of natural gashydrates in berea sandstone cores. Journal of Inclusion Phenomena andMacrocyclic Chemistry 8 (1-2): 71-88.doi:10.1007/BF01131289.