Risk Assessment and Simulation of Injectivity Decline Under Uncertainty
- Maria-Magdalena Chiotoroiu (OMV E&P) | Torsten Clemens (OMV E&P) | Markus Zechner (OMV E&P) | Jongsoo Hwang (University of Texas at Austin) | Mukul M. Sharma (University of Texas at Austin) | Marco Thiele (Streamsim)
- Document ID
- Society of Petroleum Engineers
- SPE Production & Operations
- Publication Date
- May 2020
- Document Type
- Journal Paper
- 308 - 319
- 2020.Society of Petroleum Engineers
- risk and uncertainty, water injectivity, development option, facility design, caprock
- 5 in the last 30 days
- 110 since 2007
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Waterflooding can lead to substantial incremental oil production. Implementation of water-injection projects requires the project to fit into the risk (defined here as negative outcomes relative to defined project objectives) and uncertainty (defined here as the inability to estimate a value precisely) a company is willing to take.
One of the key risks for water injection into a shallow reservoir is injection-induced fractures extending into the caprock. If this risk is seen as “intolerable” in an as-low-as-reasonably-practicable (ALARP) analysis, a decision might be made not to proceed with the project. In this study, we evaluated caprock integrity by conducting simulations of long-term water injection that include the effects of formation damage caused by internal/external plugging, geomechanical stress changes, and fracture propagation in the sandstone and bounding shale.
The risk of fracture growth into the caprock was assessed by conducting Latin hypercube sampling considering a set of modeling parameters each associated with an uncertainty range. This allowed us to identify the range of operating parameters in which the risk of fracture-height growth was acceptable. Our simulations also allowed us to identify important factors that affect caprock integrity. To cover the uncertainty in geomechanical reservoir evaluation, the operating envelope is identified such that the risk to the caprock integrity is reduced. This requires introducing a limit for the bottomhole pressure (BHP), including a safety margin.
The limit of the BHP is then used as a constraint in the uncertainty analysis of water injectivity. The uncertainty analysis should cover the various development options, the parameterization of the model, sampling from the distribution of parameters- and distance-based generalized sensitivity analysis (dGSA) as well as probabilistic representation of the results. The results indicate that the time to reach the BHP limit varies substantially, dependent on the chosen development scenario. Injection of water (1000 m3/d), with total suspended-solids content ranging from 0.1 to 0.5 ppm by volume (ppmv) and particle size from 1 to 5 mm, into long horizontal wells (2000 m) results in injection times of more than 10,000 days even for the P10 percentile. However, injection of poor-quality water (injection rate 600m3/d, well length 600 m), with total suspended-solids content ranging from 0.5 to 5 ppmv and particle size from 10 to 30 µm, leads to the BHP limit of 10 (P10) to 740 (P90) days.
The dGSA can be used to determine which parameter has a stronger impact on the BHP and, hence, on the project, and should be measured if warranted by a value-of-information analysis. In the case reported here, dGSA showed that the filter-cake permeability has a big impact on the results and, hence, will be determined by laboratory measurements.
The final development option to be chosen depends on a traditional net-present-value analysis.
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Abou-Sayed, A. S., Zaki, K. S., Wang, G. et al. 2007. Produced Water Management Strategy and Water Injection Best Practices: Design, Performance, and Monitoring. SPE Prod & Oper 22 (1): 59–68. SPE-108238-PA. https://doi.org/10.2118/108238-PA.
Al-Lawati, M. H. A., Kindi, F., Busaidi, S. et al. 2012. Integrated Surveillance and Modelling To Monitor Risk of Fault Re-Activation During Steam Injection. Paper presented at the SPE EOR Conference at Oil and Gas West Asia, Muscat, Oman, 16–18 April. SPE-155600-MS. https://doi.org/10.2118/155600-MS.
Ansari, S., Haigh, R., Khosravi, N. et al. 2012. Caprock Integrity Case Study for Non-Thermal Polymer Project Using 4D Reservoir Coupled Geomechanical Simulation. Paper presented at the SPE Heavy Oil Conference, Calgary, Alberta, Canada, 12–14 June. SPE-157912-MS. https://doi.org/10.2118/157912-MS.
Aristov, S., van den Hoek, P., and Pun, E. 2015. Integrated Approach to Managing Formation Damage in Waterflooding. Paper presented at the SPE European Formation Damage Conference and Exhibition, Budapest, Hungary, 3–5 June. SPE-174174-MS. https://doi.org/10.2118/174174-MS.
Bansal, K. M. and Caudle, D. D. 1992. A New Approach for Injection Water Quality. Paper presented at the SPE Annual Technical Conference and Exhibition, Washington, DC, USA, 4–7 October. SPE-24803-MS. https://doi.org/10.2118/24803-MS.
Begg, S. H., Welsh, M. B., and Bratvold, R. B. 2014. Uncertainty vs. Variability: What’s the Difference and Why Is It Important? Paper presented at the SPE Hydrocarbon Economics and Evaluation Symposium, Houston, Texas, USA, 19–20 May. SPE-169850-MS. https://doi.org/10.2118/169850-MS.
Berard, T., Jammes, L., Lecampion, B. et al. 2007. CO2 Storage Geomechanics for Performance and Risk Management. Paper presented at the Offshore Europe 2007 Conference, Aberdeen, UK, 4–7 September. SPE-108528-MS. https://doi.org/10.2118/108528-MS.
Bhardwaj, P., Hwang, J., Manchanda, R. et al. 2016. Injection Induced Fracture Propagation and Stress Reorientation in Waterflooded Reservoirs. Paper presented at SPE Annual Technical Conference and Exhibition, Dubai, UAE, 26–28 September. SPE-181883-MS. https://doi.org/10.2118/181883.
Caldwell, R. H. and Heather, D. I. 2001. Characterizing Uncertainty in Oil and Gas Evaluations. Paper presented at the SPE Hydrocarbon Economics and Evaluation Symposium, Dallas, Texas, USA, 2–3 April. SPE-68592-MS. https://doi.org/10.2118/68592-MS.
Campbell, J. M., Bratvold, R. B., and Begg, S. H. 2003. Portfolio Optimization: Living Up to Expectations? Paper presented at the SPE Hydrocarbon Economics and Evaluation Symposium, Dallas, Texas, USA, 5–8 April. SPE-82005-MS. https://doi.org/10.2118/82005-MS.
Clemens, T., Kienberger, G., Persaud, M. et al. 2017. Optimizing Water-Injection Design in a Shallow Offshore Reservoir. SPE Prod & Oper 23 (4): 551–563. SPE-180143-PA. https://doi.org/10.2118/180143-PA.
Craig, F. F. 1971. The Reservoir Engineering Aspects of Waterflooding, first edition. Richardson, Texas, USA: Monograph Series, Society of Petroleum Engineers.
Dake, L. P. 1978. Fundamentals of Reservoir Engineering. Amsterdam-London-New York-Tokyo: Elsevier.
Durucan, S., Shi, J. Q., de la Torre Guzman, J. et al. 2016. Reservoir Geomechanics Helps Improve CO2 Storage Performance and Risk Assessment. Paper presented at the Rock Mechanics and Rock Engineering: From the Past to the Future, Ürgüp, Turkey, 29–31 August. ISRM-EUROC-2016-005.
Eltvik, P., Skoglunn, T., and Settari, A. 1992. Waterflood-Induced Fracturing: Water Injection Above Parting Pressure at Valhal. Paper presented at the SPE Annual Technical Conference and Exhibition, Washington, DC, USA, 4–7 October. SPE-24912-MS. https://doi.org/10.2118/24912-MS.
Ershagi, I., Paul, D. L., and Kaba, S. 2018. Securing California Gas Supplies by Storage in Mature Fractured Monterey Reservoirs of Offshore California. Paper presented at the SPE Western Regional Meeting, Garden Grove, California, USA, 22–27 April. SPE-190134-MS. https://doi.org/10.2118/190134-MS.
Fenwick, D., Scheidt, C., and J. Caers. 2014. Quantifying Asymmetric Parameter Interactions in Sensitivity Analysis: Application to Reservoir Modeling. Math Geosci 46 (4): 493–511. https://doi.org/10.1007/s11004-014-9530-5.
Fourmaintraux, D. M., Bois, A.-P., Le Goff, C. et al. 2005. Detailed In Situ Stress Measurements for Qualifying the Safety of Underground Gas Storage Overburden. Paper presented at the SPE Europec/EAGE Annual Conference, Madrid, Spain, 13–16 June. SPE-94253-MS. https://doi.org/10.2118/94253-MS.
Fragachan, F. E., Shokanov, T. A., Ovalle, A. P. et al. 2007. Mitigating Risks from Waste Subsurface Pressure Injection and Decline Analysis. Paper presented at the SPE E&P Environmental and Safety Conference, Galveston, Texas, USA, 5–7 March. SPE-105555-MS. https://doi.org/10.2118/105555-MS.
Guo, Q., Geehan, T., and Pincock, M. 2005. Managing Risks and Uncertainties in Drill Cuttings Re-Injection in Challenging Environments: Field Experience from Sakhalin Island. Paper presented at the SPE/EPA/DOE Exploration and Production Environmental Conference, Galveston, Texas, USA, 7–9 March. SPE-93781-MS. https://doi.org/10.2118/93781-MS.
Hugg, D. and Kilic, M. 2015. Water Injection Pressure Protection System (WIPPS) in Deep-Water Development Offshore Brazil. Paper presented at the Offshore Technology Conference, Houston, Texas, USA, 4–7 May. OTC-25815-MS. https://doi.org/10.4043/25815-MS.
Hwang, J., Bhardwaj, P., Sharma, M. et al. 2019a. Water Injection Well Performance and Fracture Propagation in a Channel Sand Reservoir: An Offshore Ghana Case Study. Paper presented at the Offshore Technology Conference, Houston, Texas, USA, 6–9 May. OTC-29311-MS. https://doi.org/10.4043/29311-MS.
Hwang, J., Sharma, M., Amaning, K. et al. 2019b. Simulation of Injectivity and Fracture Containment: Water Injection in a Turbidite Reservoir, Offshore Ghana. Paper presented at SPE Europec/EAGE Conference, London, UK, 3–6 June. SPE-195567-MS. https://doi.org/10.2118/195567-MS.
Hwang, J. and Sharma, M. M. 2013. A 3-Dimensional Fracture Propagation Model for Long-Term Water Injection. Paper presented at the 47th US Rock Mechanics/Geomechanics Symposium, San Francisco, California, USA, 23–26 June. ARMA-13-575.
Ji, L., Settari, A., and Sullivan, R. B. 2009. A Novel Hydraulic Fracturing Model Fully Coupled with Geomechanics and Reservoir Simulation. SPE J. 14 (3): 423–430. SPE-110845-PA. https://doi.org/10.2118/110845-PA.
Joranson, H., Klein, H. H., Raaen, A. M. et al. 2007. Better Reservoir Management Through Improved Water-Injection Methods with Data Analysis and Detailed Fracture/Reservoir Modeling. Paper presented at the SPE Annual Technical Conference and Exhibition, Anaheim, California, USA, 11–14 November. SPE-110329-MS. https://doi.org/10.2118/110329-MS.
Lake, L. W. 1989. Enhanced Oil Recovery, first edition. Englewood Cliffs, New Jersey, USA: Prentice Hall.
Le Gallo, Y. and Carballo, T. A. 2016. Quantitative Assessments of CO2 Injection Risks for Onshore Large Scale CO2 Storage. Paper presented at the SPE Europec Featured at the 78th EAGE Conference and Exhibition, Vienna, Austria, 30 May–2 June. SPE-180186-MS. https://doi.org/10.2118/180186-MS.
Litvak, M., Onwunalu, J., and Baxter, J. 2011. Field Development Optimization with Subsurface Uncertainties. Paper presented at the SPE Annual Technical Conference and Exhibition, Denver, Colorado, USA, 30 October–2 November. SPE-146512-MS. https://doi.org/10.2118/146512-MS.
Mason, J. and MacLeod, I. 2009. Optimised Completion of a Produced Water Re-Injection Infill Well. Paper presented at the SPE Offshore Europe Oil and Gas Conference and Exhibition, Aberdeen, Scotland, UK, 8–11 September. SPE-123828-MS. https://doi.org/10.2118/123828-MS.
Matveeva, T., Bergfjord, E. V., Lindgard, J. E. et al. 2015. Real Time Caprock Integrity Monitoring Becomes Reality. Paper presented at the 77th EAGE Conference and Exhibition, Madrid, Spain, 1–4 June. TU N101 04. https://doi.org/10.3997/2214-4609.201412547.
McKay, M. D., Beckman, R. J., and Conover, W. J. 1979. A Comparison of Three Methods for Selecting Values of Input Variables in the Analysis of Output from a Computer Code. Technometrics 21 (2): 239–245. https://doi.org/10.2307/1268522.
McVean, J. R. 2000. The Significance of Risk Definition on Portfolio Selection. Paper presented at the SPE Annual Technical Conference and Exhibition, Dallas, Texas, USA, 1–4 October. SPE-62966-MS. https://doi.org/10.2118/62966-MS.
Mogollon, J. L., Lokhandwala, T. M., and Tillero, E. 2017. New Trends in Waterflooding Project Optimization. Paper presented at the SPE Latin America and Caribbean Petroleum Engineering Conference, Buenos Aires, Argentina, 18–19 May. SPE-185472-MS. https://doi.org/10.2118/185472-MS.
Noirot, J. C., van den Hoek, P. J., Zwarts, D. et al. 2003. Water Injection and Water Flooding Under Fracturing Conditions. Paper presented at the 13th Middle East Oil Show and Conference, Bahrain, 5–8 April. SPE-81462-MS. https://doi.org/10.2118/81462-MS.
Ochi, J., Dexheimer, D., and Corpel, P. V. 2014. Produced-Water-Reinjection Design and Uncertainty Assessment. SPE Prod & Oper 29 (3): 129–131. SPE-165138-PA. https://doi.org/10.2118/165138-PA.
Onaisi, A., Ochi, J., Mainguy, M. et al. 2011. Modeling Non-Matrix Flow and Seals Integrity in Soft Sand Reservoirs. Paper presented at the SPE European Formation Damage Conference, Noordwijk, The Netherlands, 7–10 June. SPE-144801-MS. https://doi.org/10.2118/144801-MS.
Pautz, J. F., Crocker, M. E., and Walton, C. G. 1989. Relating Water Quality and Formation Permeability to the Loss of Injectivity. Paper presented at the SPE Production Operations Symposium, Oklahoma City, Oklahoma, USA, 13–14 March. SPE-18888-MS. https://doi.org/10.2118/18888-MS.
Poon, B. B., Wodu, E. K., Ekebafe, A. O. et al. 2015. Assessment of Injection Pressure Margin in Deep Water Injection Well Design. Paper presented at the Nigeria Annual International Conference and Exhibition, Lagos, Nigeria, 4–6 August. SPE-178420-MS. https://doi.org/10.2118/178420-MS.
Saripalli, K. P., Bryant, S. L., and Sharma, M. M. 1999. Role of Fracture Face and Formation Plugging in Injection Well Fracturing and Injectivity Decline. Paper presented at the SPE/EPA Exploration and Production Environmental Conference, Austin, Texas, USA, 18 February–3 March. SPE-52731-MS. https://doi.org/10.2118/52731-MS.
Sathyamoorthy, S., Priyandoko, P., Flatval, K. B. et al. 2003. Radical Approach to Water Injection Scheme for Barton. Paper presented at the SPE International Improved Oil Recovery Conference in Asia Pacific, Kuala Lumpur, Malaysia, 20–21 October. SPE-84885-MS. https://doi.org/10.2118/84885-MS.
Sawiris, R., Howes, C. S., and Foley, W. L. 2015. Uncertainty and Risk Management Plans Are Critical for Team Alignment and Better Decision Quality. Paper presented at the SPE Annual Technical Conference and Exhibition, Houston, Texas, USA, 28–30 September. SPE-174932-MS. https://doi.org/10.2118/174932-MS.
Seba, R. D. 1987. The Only Investment Selection Criterion You Will Ever Need. Paper presented at the SPE Hydrocarbon Economics and Evaluation Symposium, Dallas, Texas, USA, 2–3 March. SPE-16310-MS. https://doi.org/10.2118/16310-MS.
Simpson, G. S., Lamb, F. E., Finch, J. H. et al. 2000. The Application of Probabilistic and Qualitative Methods to Asset Management Decision Making. Paper presented at the SPE Asia Pacific Conference on Integrated Modelling for Asset Management, Yokohama, Japan, 25–26 April. SPE-59455-MS. https://doi.org/10.2118/59455-MS.
Smalley, P. C., Ross, B., Brown, C. E. et al. 2009. Reservoir Technical Limits: A Framework for Maximizing Recovery from Oil Fields. SPE Res Eval & Eng 12 (4): 610–629. SPE-109555-PA. https://doi.org/10.2118/109555-PA.
Stevens, D. G., Murray, L. R., and Shah, P. C. 2000. Predicting Multiple Thermal Fractures in Horizontal Injection Wells; Coupling of a Wellbore and a Reservoir Simulator. Paper presented at the SPE/DOE Improved Oil Recovery Symposium, Tulsa, Oklahoma, USA, 3–5 April. SPE-59354-MS. https://doi.org/10.2118/59354-MS.
Suri, A. and Sharma, M. M. 2009. Fracture Growth in Horizontal Injectors. Paper presented at the SPE Hydraulic Fracturing Technology Conference, The Woodlands, Texas, USA, 19–21 January. SPE-119379-MS. https://doi.org/10.2118/119379-MS.
Suri, A., Sharma, M. M., and Peters, E. J. 2011. Estimates of Fracture Lengths in an Injection Well by History Matching Bottomhole Pressures and Injection Profile. SPE Res Eval & Eng 14 (4): 385–397. SPE-132524-PA. https://doi.org/10.2118/132524-PA.
Taylor, M. and Israni, C. 2014. Understanding the ALARP Concept: Its Origin and Application. Paper presented at the SPE International Conference on Health, Safety and Environment, Long Beach, California, USA, 17–19 March. SPE-168486-MS. https://doi.org/10.2118/168486-MS.
Tilke, P. G., Banerjee, R., Halabe, V. B. et al. 2010. Automated Field Development Planning in the Presence of Subsurface Uncertainty and Operational Risk Tolerance. Paper presented at the SPE Annual Technical Conference and Exhibition, Florence, Italy, 19–22 September. SPE-135168-MS. https://doi.org/10.2118/135168-MS.
van den Hoek, P. J., Matsuura, T., de Kroon, M. et al. 1999. Simulation of Produced Water Reinjection Under Fracturing Conditions. SPE Prod & Fac 14 (3): 166–176. SPE-57385-PA. https://doi.org/10.2118/57385-PA.
van Oort, E., van Velzen, J. F. G., and Leerlooijer, K. 1993. Impairment by Suspended Solids Invasion: Testing and Prediction. SPE Prod & Fac 8 (3): 178–184. SPE-23822-PA. https://doi.org/10.2118/23822-PA.
Verga, F., Giglio, G., Oreste, P. et al. 2005. How Safe Is Underground Natural Gas Storage? Gas Storage Delta-Pressure: Story of a Successful Application. Paper presented at the Offshore Mediterranean Conference and Exhibition, Ravenna, Italy, 16–18 March. OMC-2005-056.
Welsh, M. B. and Begg, S. H. 2008. Modeling the Economic Impact of Individual and Corporate Risk Attitude. Paper presented at the SPE Annual Technical Conference and Exhibition, Denver, Colorado, USA, 21–24 September. SPE-116610-MS. https://doi.org/10.2118/116610-MS.
Wiig, E., Berthelsen, I., and Donovan, K. 1996a. The Troll HSE Risk Management System. Paper presented at the International Conference Health, Safety, and Environment, New Orleans, Louisiana, USA, 9–12 June. SPE-36064-MS. https://doi.org/10.2118/36064-MS.
Wiig, E., Nesse, E., and Kittelsen, A. 1996b. Environmental Quantitative Risk Assessment (EQRA). Paper presented at the International Conference on Health, Safety, and Environment, New Orleans, Louisiana, USA, 9–12 June. SPE-35945-MS. https://doi.org/10.2118/35945-MS.
Worth, D. J., Crepin, S., Alhanti, F. et al. 2008. Risk Assessment for SAGD Well Blowouts. Paper presented at the SPE International Thermal Operations and Heavy Oil Symposium, Calgary, Alberta, Canada, 20–23 October. SPE-117679-MS. https://doi.org/10.2118/117679-MS.
Ybray, D., Galiyeva, G., and Ibragimov, F. 2011. Caprock Integrity Study in Kashagan. Paper presented at the 10th Offshore Mediterranean Conference and Exhibition, Ravenna, Italy, 23–25 March. OMC-2011-126.