Integrating True Valve Performance Into Gas Lift Design and Troubleshooting
- Adam Wilson (JPT Special Publications Editor)
- Document ID
- Society of Petroleum Engineers
- Journal of Petroleum Technology
- Publication Date
- July 2014
- Document Type
- Journal Paper
- 107 - 109
- 2014. International Petroleum Technology Conference
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- 221 since 2007
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This article, written by Special Publications Editor Adam Wilson, contains highlights of paper IPTC 16656, "Integrating True Valve Performance Into Production-System- Analysis-Based Gas Lift Design and Troubleshooting for Dukhan Field, Qatar," by Sanjay K. Singh, James W. Hall, SPE, Eraky Khalil, Balsam Al-Marri, and Reem Al-Abdulla, Qatar Petroleum, prepared for the 2013 International Petroleum Technology Conference, Beijing, 26-28 March. The paper has not been peer reviewed.
Production-system-analysis methods have been used and are currently used for gas lift design and troubleshooting. These methods, however, have been found to be inadequate in several cases for achieving optimum design or troubleshooting problems. To make up for the inadequacy, a new approach has been applied that uses the Valve Performance Clearinghouse (VPC) database. The new approach joins well performance from production-system analysis and true valve performance from the VPC database to form an integrated system performance tool.
Qatar Petroleum’s Dukhan field is onshore Qatar approximately 80 km west of Doha. The number of wells in this field requiring artificial-lift assistance has increased over the past few years, and the trend is likely to continue because of reservoir-pressure decline and rising water cut. The availability of gas coupled with compression and distribution-facility availability has made gas lift a natural choice among various artificial-lift methods. The increasing number of wells using gas lift makes gas lift design and troubleshooting key factors in achieving crude-oil-production targets.
Production-system analysis determines a well’s inflow and outflow performance and combines them at a solution node to obtain the well’s system performance. The purpose of gas lift is to lighten the flowing production gradient by injecting gas into the production string of a well. Gas injection into the production string improves the well’s outflow performance by increasing the gas/liquid ratio (GLR) of the production stream from the formation GLR to an objective GLR (OGLR). There are two phases to gas lift operation: unloading and production.
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