An Integrated Approach To Well Integrity Evaluation Via Reliability Assessment Of Well Integrity Tools And Methods: Results From Dukhan Field, Qatar
- Sanjay Kumar Singh (Qatar Petroleum) | Herry Subekti (Qatar Petroleum) | Mona Al-Asmakh (Qatar Petroleum) | Layth Salih Al-Samarraie (Qatar Petroleum)
- Document ID
- Society of Petroleum Engineers
- SPE International Production and Operations Conference & Exhibition, 14-16 May, Doha, Qatar
- Publication Date
- Document Type
- Conference Paper
- 2012. Society of Petroleum Engineers
- 2 Well Completion, 4.3.4 Scale, 4.1.5 Processing Equipment, 5.6.4 Drillstem/Well Testing, 4.2.3 Materials and Corrosion, 3 Production and Well Operations, 1.14 Casing and Cementing, 4.1.2 Separation and Treating, 2.2.2 Perforating
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Qatar Petroleum's super-giant Dukhan field located onshore Qatar has a mature inventory of hundreds of wells. Managing integrity of such mature well inventory to avoid unplanned downtime has been no less crucial than any other activity to
maximizing production and injection. This involves costly wellwork decisions for integrity control and repair, which rely heavily on data obtained from a well integrity monitoring program. Well integrity monitoring program ranges from using basic methods to state-of-the-art downhole monitoring tools. Their applications are almost always associated with limitations that impose uncertainty in well integrity evaluation. This paper presents an integrated approach Qatar Petroleum used to address this issue.
This approach consisted of performing reliability assessment of the entire array of available tools and methods against given well conditions with a matrix of assessment criteria. This matrix enabled selection of a fit-for-purpose set of tools and methods with clear understanding of their strengths and limitations. Techniques of correlation, bracketing and elimination were then applied to analyze the outputs obtained from using the selected set of tools and methods. The approach allowed detecting well integrity problems and determining their severity with minimal uncertainty. The paper focuses on intricacies of the approach, and how its implementation results in a sound well integrity evaluation. It also presents field examples that demonstrate efficacy of the approach in supporting costly wellwork decisions for restoring well integrity. Successfully restoring the well integrity unlocked revenue potential, made quick payout of the wellwork costs and extended the field life.
Dukhan field is located onshore Qatar approximately 80 km to west of Doha, the capital of the state of Qatar. The field has a mature inventory of a large number of wells. Qatar Petroleum (QP) manages integrity of such wells via its established well
integrity monitoring and remedial wellwork programs. Data obtained from the monitoring program are used for integrity evaluation that in turn leads to deciding the requirement and type of wellwork for integrity control and repair. Majority of the wellwork decisions are cost-intensive and a sound integrity evaluation is key to their success.
One of the most popular definitions of well integrity, as provided in NORSOK D-010, is "application of technical, operational and organizational solutions to reduce risk of uncontrolled release of formation fluids throughout the life cycle of a well". Application of the solutions mentioned in this definition basically aim at preventing, detecting and repairing integrity problems. QP's well integrity monitoring program focuses on preventing and detecting a wide range of potential integrity problems that can occur in surface and downhole components of a well. An array of techniques involving basic methods to state-of-the-art downhole tools is used. Each of the methods and tools has its own strengths as well as limitations. Limitations of methods and tools have the potential of imposing uncertainty in well integrity evaluation. An integrated approach has been developed to address this issue.
Subsequent sections of this paper discuss intricacies of this approach and present some field examples to show how implementation of the approach resulted in sound well integrity evaluation.
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