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
- 5 in the last 30 days
- 355 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|
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