A Pragmatic Approach To Understanding Liquid Loading in Gas Wells
- M. Feldy Riza (Texas A&M University) | A. Rashid Hasan (Texas A&M University) | C. Shah Kabir (Hess Corporation (retired))
- Document ID
- Society of Petroleum Engineers
- SPE Production & Operations
- Publication Date
- August 2016
- Document Type
- Journal Paper
- 185 - 196
- 2016.Society of Petroleum Engineers
- Entire wellbore modeling approach, tubing ID and well PI control critical liquid-loading rate, liquid loading in gas wells
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- 1,034 since 2007
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Liquid loading is the inability of a producing gas well to remove its coproduced liquids from the wellbore. The liquid flowing as droplets or film accumulates at the well bottom, thereby imposing backpressure at the sandface and triggering increasingly higher pressure loss in the wellbore. The problem initiated by liquid loading is manifested in terms of loss in well deliverability, causing the wellhead pressure to decline significantly, which, in turn, leads to the cessation of gas production. Accordingly, the liquid-loading issue reduces the ultimate recovery of a gas well.
Both the droplet-flow reversal and liquid-film-flow reversal have been postulated to be the underlying mechanism for liquid loading. Both mechanisms are predominantly premised on diagnosing the problem at the wellhead-flow conditions. This study explores the deliquefication issue in a gas well by fluid- and heat-flow modeling of the entire wellbore for a variety of flow situations in gas and gas/condensate reservoirs.
We observed that when a well experiences annular two-phase flow throughout the wellbore, no liquid loading occurs. The transition from annular flow to churn or slug flow initiates the liquid-film-flow or droplet-flow reversal, thereby triggering liquid loading. Most often, the flow condition at the well bottom controls the onset of liquid loading. By use of three published data sets, we show that the understanding of liquid loading improves when the entire wellbore-flow modeling is used. Forward modeling suggests that the tubing inside diameter and the well productivity index are the most important independent variables in determining the critical liquid-loading rate and the onset of liquid loading.
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Agrawal, S. and Sharma, M. M. 2013. Impact of Liquid Loading in Hydraulic Fractures on Well Productivity. Presented at the SPE Hydraulic Fracturing Technology Conference, The Woodlands, TX, USA, 4–6 February. SPE-163837-MS. http://dx.doi.org/10.2118/163837-MS.
Alamu, M. B. 2012. Gas-Well Liquid Loading Probed With Advanced Instrumentation. SPE J. 17 (1): 251–270. SPE-153724-PA. http://dx.doi.org/10.2118/153724-PA.
Ansari, A. M., Sylvester, N. D., Sarica, C. et al. 1994. A Comprehensive Mechanistic Model for Upward Two-Phase Flow in Wellbores. SPE Prod & Fac 9 (2): 143–151. SPE-20630-PA. http://dx.doi.org/10.2118/20630-PA.
Barnea, D. 1986. Transition from annular flow and from dispersed bubble flow?unified models for the whole range of pipe inclinations. Int. J. Multiphase Flow 12 (5): 733–744. http://dx.doi.org/10.1016/0301-9322(86)90048-0.
Barnea, D. 1987. A unified model for predicting flow-pattern transitions for the whole range of pipe inclinations. Int. J. Multiphase Flow 13 (1): 1–12. http://dx.doi.org/10.1016/0301-9322(87)90002-4.
Belfroid, S. P. C., Schiferli, W., Alberts, G. J. N. et al. 2008. Prediction Onset and Dynamic Behaviour of Liquid Loading Gas Wells. Presented at the SPE Annual Technical Conference and Exhibition, Denver, Colorado, USA, 21–24 September. SPE-115567-MS. http://dx.doi.org/10.2118/115567-MS.
Coleman, S. B., Clay, H. B., McCurdy, D. G. et al. 1991a. A New Look at Predicting Gas-Well Load-Up. J Pet Technol 43 (3): 329–333. SPE-20280-PA. http://dx.doi.org/10.2118/20280-PA.
Coleman, S. B., Clay, H. B., McCurdy, D. G. et al. 1991b. Understanding Gas-Well Load-Up Behavior. J Pet Technol 43 (3): 334–338. SPE-20281-PA. http://dx.doi.org/10.2118/20281-PA.
Dietz, D. N. 1965. Determination of Average Reservoir Pressure From Build-Up Surveys. J Pet Technol 17 (8): 955–959. SPE-1156-PA. http://dx.doi.org/10.2118/1156-PA.
Dousi, N., Veeken, C. A. M., and Currie, P. K. 2006. Numerical and Analytical Modeling of the Gas-Well Liquid-Loading Process. SPE Prod & Oper 21 (4): 475–482. SPE-95282-PA. http://dx.doi.org/10.2118/95282-PA.
Hasan, A. R. and Kabir, C. S. 2002. Fluid Flow and Heat Transfer in Wellbores. Richardson, Texas, USA: SPE Textbook Series.
Hasan, A. R. and Kabir, C. S. 2007. A Simple Model for Annular Two-Phase Flow in Wellbores. SPE Prod & Oper 22 (2): 168–175. SPE-95523-PA. http://dx.doi.org/10.2118/95523-PA.
Hasan, A. R., Kabir, C. S., and Sayarpour, M. 2010. Simplified two-phase flow modeling in wellbores. J Pet Sci & Eng 72 (1–2): 42–49. http://dx.doi.org/10.1016/j.petrol.2010.02.007.
Hasan, A. R., Kabir, C. S., and Wang, X. 2009. A Robust Steady-State Model for Flowing-Fluid Temperature in Complex Wells. SPE Prod & Oper 24 (2): 269–276. SPE-109765-PA. http://dx.doi.org/10.2118/109765-PA.
Hu, B., Veeken, K., Yusuf, R. et al. 2010. Use of Wellbore-Reservoir Coupled Dynamic Simulation to Evaluate the Cycling Capability of Liquid-Loaded Gas Wells. Presented at the SPE Annual Technical Conference and Exhibition, Florence, Italy, 19–22 September. SPE-134948-MS. http://dx.doi.org/10.2118/134948-MS.
Jackson, D. F. B., Virués, C. J. J., and Sask, D. 2011. Investigation of Liquid Loading in Tight Gas Horizontal Wells With a Transient Multiphase Flow Simulator. Presented at the Canadian Unconventional Resources Conference, Calgary, 15–17 November. SPE-149477-MS. http://dx.doi.org/10.2118/149477-MS.
Kabir, C. S. and Hasan, A. R. 2006. Simplified Wellbore-Flow Modeling in Gas/Condensate Systems. SPE Prod & Oper 21 (1): 89–97. SPE-89754-PA. http://dx.doi.org/10.2118/89754-PA.
Kabir, C. S. and Izgec, B. 2009. Diagnosis of reservoir compartmentalization from measured pressure/rate data during primary depletion. J Pet Sci & Eng 69 (3–4): 271–281. http://dx.doi.org/10.1016/j.petrol.2009.09.007.
Lea, J. F. and Nickens, H. V. 2004. Solving Gas-Well Liquid-Loading Problems. J Pet Technol 56 (4): 30–36. SPE-72092-JPT. http://dx.doi.org/10.2118/72092-JPT.
Limpasurat, A., Valkó, P. P., and Falcone, G. 2015. A New Concept of Wellbore-Boundary Condition for Modeling Liquid Loading in Gas Wells. SPE J 20 (3): 550–564. SPE-166199-PA. http://dx.doi.org/10.2118/166199-PA.
Luo, S., Kelkar, M., Pereyra, E. et al. 2014. A New Comprehensive Model for Predicting Liquid Loading in Gas Wells. SPE Prod & Oper 29 (4): 337–349. SPE-172501-PA. http://dx.doi.org/10.2118/172501-PA.
Nosseir, M. A., Darwich, T. A., Sayyouh, M. H. et al. 2000. A New Approach for Accurate Prediction of Loading in Gas Wells Under Different Flowing Conditions. SPE Prod & Fac 15 (4): 241–246. SPE-66540-PA. http://dx.doi.org/10.2118/66540-PA.
Plackett, R. L. and Burman, J. P. 1946. The Design of Optimum Multifactorial Experiments. Biometrika 33 (4): 305–325. http://dx.doi.org/10.2307/2332195.
Riza, M. F. 2013. Reservoir-Wellbore Coupled Simulation of Liquid Loaded Gas Well Performance. MS thesis, Texas A&M University, College Station, Texas, USA.
Sutton, R. P., Cox, S. A., Lea, J. F. et al. 2010. Guidelines for the Proper Application of Critical Velocity Calculations. SPE Prod & Oper 25 (2): 182–194. SPE-120625-PA. http://dx.doi.org/10.2118/120625-PA.
Taitel, Y., Bornea, D. and Dukler, A. E. 1980. Modeling Flow Pattern Transitions for Steady Upward Gas-Liquid Flow in Vertical Tubes. AIChE J. 26 (3): 345–354. http://10.1002/aic.690260304.
Turner, R. G., Hubbard, M. G., and Dukler, A. E. 1969. Analysis and Prediction of Minimum Flow Rate for the Continuous Removal of Liquids from Gas Wells. J Pet Technol 21 (11): 1475–1482. SPE-2198-PA. http://dx.doi.org/10.2118/2198-PA.
van’t Westende, J. M. C., Kemp, H. K., Belt, R. J. et al. 2007. On the role of droplets in concurrent annular and churn-annular pipe flow. Int J Multiphase Flow 33 (6): 595–615. http://dx.doi.org/10.1016/j.ijmultiphaseflow.2006.12.006.
Veeken, K., Hu, B., and Schiferli, W. 2010. Gas-Well Liquid-Loading-Field-Data Analysis and Multiphase-Flow Modeling. SPE Prod & Oper 25 (3): 275–284. SPE-123657-PA. http://dx.doi.org/10.2118/123657-PA.
Wallis, G. B. 1969. One-Dimensional Two-Phase Flow. New York: McGraw-Hill.
Waltrich, P. J., Falcone, G., and Barbosa, J. R. Jr. 2013. Axial development of annular, churn and slug, flows in a long vertical tube. Int J Multiphase Flow 57: 38–48. http://dx.doi.org/10.1016/j.ijmultiphaseflow.2013.06.008.
Yuan, G., Pereyra, E., Sarica, C. et al. 2013. An Experimental Study on Liquid Loading of Vertical and Deviated Gas Wells. Presented at the SPE Production and Operations Symposium, Oklahoma City, Oklahoma, USA, 23–26 March. SPE-164516-MS. http://dx.doi.org/10.2118/164516-MS.
Zhang, H., Falcone, G., and Teodoriu, C. 2010. Relative Permeability Hysteresis Effects in the Near-Wellbore Region During Liquid Loading in Gas Wells. Presented at the SPE Latin American and Caribbean Petroleum Engineering Conference, Lima, Peru, 1–3 December. SPE-139062-MS. http://dx.doi.org/10.2118/139062-MS.
Zhang, H., Falcone, G., Valko, P. et al. 2009. Numerical Modeling of Fully-Transient Flow in the Near-Wellbore Region During Liquid Loading in Gas Wells. Presented at the SPE Latin American and Caribbean Petroleum Engineering Conference, Cartagena de Indias, Colombia, 31 May–3 June. SPE-122785-MS. http://dx.doi.org/10.2118/122785-MS.
Zhou, D. and Yuan, H. 2010. A New Model for Predicting Gas-Well Liquid Loading. SPE Prod & Oper 25 (2): 172–181. SPE-120580-PA. http://dx.doi.org/10.2118/120580-PA.