Design and Analysis of Leak-Testing Methodology for Gas Lift Valves
- T. Rocha-Valadez (Texas A&M University) | A. R. Hasan (Texas A&M University) | M. S. Mannan (Texas A&M University) | C. S. Kabir (Hess Corporation (retired))
- Document ID
- Society of Petroleum Engineers
- SPE Production & Operations
- Publication Date
- May 2016
- Document Type
- Journal Paper
- 176 - 184
- 2016.Society of Petroleum Engineers
- Quantifying leak with type curves, Model validation with field data, Leak testing methods for gas-lift valves , Forward and interpretive model
- 4 in the last 30 days
- 455 since 2007
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Properly operating gas lift valves (GLVs) allow annular gas to flow into the tubing and prevent any backflow. However, erosion, corrosion, and other effects may cause a GLV to leak, thereby posing a serious safety issue. Suspected leaking GLVs are often retrieved for inspection to address safety issues. Proactive testing is a way to minimize costly interventions. Accordingly, nonintrusive test procedures have emerged. For example, tests entailing monitoring of annular transient-pressure response can establish a GLV’s integrity by avoiding valve retrieval for inspection.
This study details the development of a forward model that helps design methodology for GLV testing. The model recommends drawing down the annular gas to develop a positive pressure differential to allow fluid flow from the tubing into the annulus through the suspected GLV. This drawdown (DD) is followed by a pressure-buildup (BU) test. These pressure-transient tests allow the determination of the integrity and extent of GLV damage. The forward model also allows the estimation of the time needed for each segment of the transient-test sequence, thereby helping to schedule such tests at a certain operational frequency.
|File Size||1 MB||Number of Pages||9|
Altun, G., Langlinais, J., and Bourgoyne, A. T. 2001. Application of a New Model to Analyze Leak-off Tests. SPE Drill & Compl 16 (2): 108–116. SPE-72061-PA. http://dx.doi.org/10.2118/72061-PA.
Carlsen, J. A., Stokka, Ø., and Kleppa, E. 2010. Taking the Gas Lift Valves to a New Level of Reliability. Presented at the Offshore Technology Conference, Houston, 3–6 May. SPE-20820-MS. http://dx.doi.org/10.2118/20820-MS.
Dethlefs, J. and Chastain, B. 2012. Assessing Well-Itegrity Risk: A Qualitative Model. SPE Drill & Compl 27 (2): 294–302. SPE-142854-PA. http://dx.doi.org/10.2118/142854-PA.
Gilbertson, E., Hover, F., and Freeman, B. 2013. A Thermally Actuated Gas-Lift Safety Valve. SPE Prod & Oper 28 (1): 77–84. SPE-161930-PA. http://dx.doi.org/10.2118/161930-PA.
Huerta, N. J., Checkai, D. A., and Bryant, S. L. 2009. Utilizing Sustained Casing Pressure Analog to Provide Parameters to Study CO2 Leakage Rates Along a Wellbore. Presented at the SPE International Conference on CO2 capture, Storage, and Utilization, San Diego, California, USA, 2–4 November. SPE-126700-MS. http://dx.doi.org/10.2118/126700-MS.
Julian, J. Y., Jackson, J. C., and White, T. M. 2014. A History of Gas Lift Valve and Gas Lift Mandrel Damage and Subsequent Retrofit Gas Lift Straddle Installation in Alaska. Presented at the SPE/CoTA Coiled Tubing and Well Intervention Conference and Exhibition, The Woodlands, Texas, USA, 25–26 March. SPE-168304-MS. http://dx.doi.org/10.2118/168304-MS.
McCoy, J. N., Rowlan, O. L., and Podio, A. 2009. Acoustic Liquid Level Testing of Gas Wells. Proc., SPE Production and Operations Symposium, Oklahoma City, Oklahoma, USA, 4–8 April. SPE-120643-MS. http://dx.doi.org/10.2118/120643-MS.
Rocha-Valadez, T., Hasan, A. R., Mannan, M. S. et al. 2015. Assessing Integrity of the Gas-Lift Valves by Analyzing Annular-Pressure-Transient Response. Journal of Petroleum Science and Engineering 133: 177–183. http://dx.doi.org./10.1016/j.petrol.2015.05.002.
Rocha-Valadez, T., Hasan, A. R., Mannan, M. S. et al. 2014a. Assessing Wellbore Integrity in Sustained-Casing-Pressure Annulus. SPE Drill & Compl 29 (1): 131–138. SPE-169814-PA. http://dx.doi.org/10.2118/169814-PA.
Rocha-Valadez, T., Metzger, R. A., Hasan, A. R. et al. 2014b. Inherently Safer Sustained Casing Pressure Testing for Well Integrity Evaluation. J. Loss Prevention in the Process Industries 29: 209–215. http://dx.doi.org/10.1016/j.jlp.2014.02.012.
Taylor, C., Rowlan, O. L., and McCoy, J. 2014. Acoustic Techniques to Monitor and Troubleshoot Gas-Lift Wells. Proc., SPE Western North American and Rocky Mountain Joint Regional Meeting, Denver, USA, 17–18 April. SPE-169536-MS. http://dx.doi.org/10.2118/169536-MS.
Wang, H., Soliman, M. Y., Shan, Z. et al. 2011. Understanding the Effects of Leakoff Tests on Wellbore Strength. SPE Drill & Compl 26 (4): 531–539. SPE-132981-PA. http://dx.doi.org/10.2118/132981-PA.
Watson, T. L. and Bachu, S. 2009. Evaluation of the Potential for Gas and CO2 Leakage Along Wellbores. SPE Drill & Compl 24 (1): 115–126. SPE-106817-PA. http://dx.doi.org/10.2118/106817-PA.