A Transient Two-Phase Fluid- and Heat-Flow Model for Gas-Lift-Assisted Waxy-Crude Wells With Periodical Electric Heating
- Guoqing Han (China University of Petroleum) | He Zhang (Ryder Scott Company) | Kegang Ling (Univ. of North Dakota) | Di Wu (China University of Petroleum) | Zuguo Zhang (SINOPEC Exploration & Production Research Institute)
- Document ID
- Society of Petroleum Engineers
- Journal of Canadian Petroleum Technology
- Publication Date
- September 2014
- Document Type
- Journal Paper
- 304 - 314
- 2014.Society of Petroleum Engineers
- waxy well, cyclic electric heating, transient multi-interface heat transfer, heavy oil
- 1 in the last 30 days
- 319 since 2007
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This paper presents innovative iteration algorithms for multi-interface heat transfer in pipe flow. To the best of our knowledge,this is the first approach derived from the drift-flux model (DFM), which is more competent than mechanistic models for high-slippage gas/liquid flow. The mass- and momentum-conservation equations are inherited from literature and we have written them in the differential forms. In parallel, we thoroughly analyzed the heat-flux conservation among different layers and successfully presented the derivatives of temperature in location and time. Finally, the solution is obtained numerically to capture the temperature/ pressure-distribution profiles under transient conditions. For waxy-crude fields, it is critical to sustain the flowing temperature above the wax-appearance temperature. This is especially challenging for gas-lift-assisted wells. The injected gas, commonly at a relatively low temperature, makes this flow-assurance problem sophisticated. An effective practice is to heat up the flowing fluid by installing an electrical cable in tubing. The heat exchange happens at three interfaces in the production system: between cable and flowing crude, flowing crude and injected gas, and injected gas and formation. It is challenging to model such a multiphase production system, including an inner annulus inside the tubing, because once the electrical cable is installed, an outer annulus is where the gas is injected. To optimize this production system, a rigorous transient multiphase and multi-interface heat transfer simulator is required. By integrating the subsurface boundary condition explicitly, new algorithms can optimize the cable length, heating period, supplied power, or gas-injection rate for the aforementioned production system. This new method has been applied successfully for several gas-lift-assisted wells in a waxy-crude field located in northern China. The power consumption has decreased noticeably by 30% more than the historical field performance. The delegated optimization scheme reduces the shut-in time in winters, which promises cost-savings. The presented model not only satisfies the exceptional modelling requirements for periodically heating crude producers, but it also is appropriate for other heat-transfer investigations under transient multi-interface and multiphase-flow conditions.
|File Size||1004 KB||Number of Pages||11|
Alves, I.N., Alhanati, F.J.S., Shoham, O. 1992. A Unified Model for Predicting Flowing Temperature Distribution in Wellbores and Pipelines. SPE Prod & Fac 7 (4): 363-367. SPE-20632-PA. http://dx.doi.org/10.2118/20632-PA.
Ansari, A.M., Sylvester, N.D., Shoham., O., et al. 1990. A Comprehensive Mechanistic Model for Upward Two-Phase Flow in Wellbores. Paper presented at the SPE Annual Technical Conference and Exhibition, New Orleans, Louisiana, USA, 23–26 September. SPE-20630-MS. http://dx.doi.org/10.2118/20630-MS.
Bahonar, M., Azaiez, J., and Chen, Z. 2011. Transient Nonisothermal Fully Coupled Wellbore/Reservoir Model for Gas-Well Testing, Part 1: Modelling. J Can Pet Technol 50 (9-10):37-50. SPE-149617-PA. http://dx.doi.org/10.2118/149617-PA.
Bendiksen, K.H., Maines, D., Moe, R., et al. 1991. The Dynamic Two-Fluid Model OLGA: Theory and Application. SPE Prod Eng 6 (2): 171-180. SPE-19451-PA. http://dx.doi.org/10.2118/19451-PA.
Brill, J.P. and Mukherjee, H. 1999. Multiphase Flow in Wells, Vol. 17, 2-69. Richardson, Texas: Monograph Series, Society of Petroleum Engineers.
Falcone, G., Teodoriu, C., Reinicke, K.M., et al. 2007. Multiphase Flow Modelling Based on Experimental Testing: A Comprehensive Overview of Research Facilities Worldwide and the Need for Future Developments. Paper presented at the SPE Annual Technical Conference and Exhibition, Anaheim, California, USA, 11–14 November. SPE-110116-MS. http://dx.doi.org/10.2118/110116-MS.
Gomez, L.E., Shoham, O., and Taitel, Y. 2000. Prediction of slug liquid holdup: horizontal to upward vertical flow. International Journal of Multiphase Flow. 26 (3): 517-523. http://dx.doi.org/10.1016/S0301-9322(99)00025-7.
Hasan, A.R., and Kabir, C.S. 1988. A Study of Multiphase Flow Behavior in Vertical Wells. SPE Prod Eng 3 (2): 263–272. SPE-15138-PA. http://dx.doi.org/10.2118/15138-PA.
Hasan, A.R., and Kabir, C.S. 1994. Aspects of Wellbore Heat Transfer During Two-Phase Flow. SPE Prod & Fac 9 (3): 211-216. SPE-22948-PA. http://dx.doi.org/10.2118/22948-PA.
Hasan, A.R., and Kabir, C.S. 1996. A Mechanistic Model for Computing Fluid Temperature Profiles in Gas-Lift Wells. SPE Prod & Fac 11 (3): 179-185. SPE-26098-PA. http://dx.doi.org/10.2118/26098-PA.
Hasan, A.R., Kabir, C.S., and Wang, X. 1998. Wellbore Two-Phase Flow and Heat Transfer During Transient Testing. SPE J 3 (2): 174-180. SPE-38946-MS. http://dx.doi.org/10.2118/38946-PA.
Hasan, A.R. and Kabir, C.S. 2002. Fluid Flow and Heat Transfer in Wellbores. Richardson, Texas: Textbook Series, Society of Petroleum Engineers.
Hasan, A.R., Kabir, C.S., and Lin, D. 2005. Analytic Wellbore Temperature Model for Transient Gas-Well Testing. SPE Res Eval & Eng 8 (3): 240-247. SPE-84288-PA. http://dx.doi.org/10.2118/84288-PA.
Hasan, A.R., and Kabir, C.S. 2009. Modeling Two-Phase Fluid and Heat Flows in Geothermal Wells. Paper presented at the SPE Western Regional Meeting, San Jose, California, 24–26 March. SPE-121351-MS. http://dx.doi.org/10.2118/121351-MS.
Liao. J., Mei, R., and Klausner, J.F. 2008. A study on the numerical stability of the two-fluid model near ill-posedness. International Journal of Multiphase Flow 34 (11): 1067-1087. http://dx.doi.org/10.1016/j.ijmultiphaseflow.2008.02.010.
Ozon, P.M., Ferschneider, G., and Chwetzoff, A. 1987. A New Multiphase Flow Model Predicts Pressure And Temperature Profiles In Wells. Paper presented at the SPE Offshore Europe Conference, Aberdeen, Scotland, United Kingdom, 8–11 September. SPE-16535-MS. http://dx.doi.org/10.2118/16535-MS.
Pan, L., Oldenburg, C.M., Wu, Y.-S. et al. 2011. T2Well/ECO2N Version 1.0: Multiphase and Non-Isothermal Model for Coupled Wellbore-Reservoir Flow of Carbon Dioxide and Variable Salinity Water. LBNL-4291E, US DOE, Berkeley, CA (March 11). http://esd.lbl.gov/files/research/projects/tough/documentation/T2Well_ECO2N_Manual.pdf.
Petalas, N., and Aziz, K. 2000. A Mechanistic Model for Multiphase Flow in Pipes. J Can Pet Technol 39 (6): 43-55. PETSOC-00-06-04. http://dx.doi.org/10.2118/00-06-04.
Pourafshary, P. 2007. A Coupled Wellbore/Reservoir Simulator to Model Multiphase Flow and Temperature Distribution. PhD dissertation, the University of Texas at Austin, Texas, USA (December 2007).
Ramey, H.J. Jr. 1962. Wellbore Heat Transmission. J Pet Technol 14 (4): 427–435. SPE-96-PA. http://dx.doi.org/10.2118/96-PA.
Richter, H.J. 1981. Flooding in Tubes and Annuli. International Journal of Multiphase Flow 7 (6): 647-658. http://dx.doi.org/10.1016/0301-9322(81)90036-7.
Satter, A. 1965. Heat Losses During Flow of Steam Down a Wellbore. J Pet Technol 17 (7): 845–851. SPE-1071-PA. http://dx.doi.org/10.2118/1071-PA.
Shi, H., Holmes, J.A., Durlofsky, L.J., et al. 2005. Drift-Flux Modeling of Two-Phase Flow in Wellbores. SPE J. 10 (1): 24-33. SPE-84228-PA. http://dx.doi.org/10.2118/84228-PA.
Shirdel, M. and Sepehrnoori, K. 2011. Development of a Transient Mechanistic Two-Phase Flow Model for Wellbores. Paper presented at the SPE Reservoir Simulation Symposium ,The Woodlands, Texas, USA, 21–23 February. SPE-142224-MS. http://dx.doi.org/10.2118/142224-MS.
Stone, T.W., Edmunds, N.R., and Kristoff, B.J. 1989. A Comprehensive Wellbore/Reservoir Simulator. Paper presented at the SPE Symposium on Reservoir Simulation, Houston, Texas, USA, 6–8 February. SPE-18419-MS. http://dx.doi.org/10.2118/18419-MS.
Taitel, Y. and Dukler, A.E. 1976. A Model for Predicting Flow Regime Transitions in Horizontal and Near Horizontal Gas-Liquid Flow. AIChE Journal 22 (1): 47-57. http://dx.doi.org/10.1002/aic.690220105.
Taitel, Y., Bornea, D., and Dukler, A.E. 1980. Modelling flow pattern transitions for steady upward gas-liquid flow in vertical tubes. AIChE Journal 26 (3): 345-354. http://dx.doi.org/10.1002/aic.690260304.
Waltrich, P.J. and Barbosa, J.R. 2011. Performance of Vertical Transient Two-Phase Flow Models Applied to Liquid Loading in Gas Wells. Paper presented at the SPE Annual Technical Conference and Exhibition, Denver, Colorado, USA, 30 October–2 November. SPE-147128-MS. http://dx.doi.org/10.2118/147128-MS.
Winterfeld, P.H. 1989. Simulation of Pressure Buildup in a Multiphase Wellbore/Reservoir System. SPE Form Eval 4(2): 247-252. SPE-15534-PA. http://dx.doi.org/10.2118/15534-PA.
Xiao, J.J., Shoham, O., and Brill, J.P. 1990. A Comprehensive Mechanistic Model for Two-Phase Flow in Pipelines. Paper presented at the SPE Annual Technical Conference and Exhibition, New Orleans, LA, USA, 23–26 September. SPE-20631-MS. http://dx.doi.org/10.2118/20631-MS.
Zuber, N. and Findlay, J.A. 1965. Average Volumetric Concentration in Two-Phase Flow Systems. Journal of Heat Transfer 87 (4): 453-468. http://dx.doi.org/10.1115/1.3689137.