Well-Integrity Issues in Malacca Strait Contract Area
- Karen Bybee (JPT Assistant Technology Editor)
- Document ID
- Society of Petroleum Engineers
- Journal of Petroleum Technology
- Publication Date
- April 2011
- Document Type
- Journal Paper
- 64 - 68
- 2011. Society of Petroleum Engineers
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- 119 since 2007
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This article, written by Assistant Technology Editor Karen Bybee, contains highlights of paper SPE 129083, "Well Integrity Issues in Malacca Strait Contract Area," by Weka Janitra Calosa, SPE, and Bambang Sadarta, SPE, EMP Malacca Strait, and Ronaldi, WCS Indonesia, originally prepared for the 2010 SPE Oil and Gas India Conference and Exhibition, Mumbai, 20-22 January. The paper has not been peer reviewed.
The Malacca Strait contract area is east of Sumatra Island between Sumatra and the Malaya Cape. This area started oil production in the early 1980s, and consists of 175 onshore and offshore oil wells spread over five fields. A 7.9 Richter scale earthquake occurred on 12 September 2007. Two days later, during a snubbing unit service on Well K-02, the 95/8-in. casing suddenly dropped down 6 ft. It was believed that the area had been affected by the earthquake. Following the incident, the well-services team inspected Well K-02 and found that it had an integrity problem.
Following the Well K-02 incident, historical records were examined, and it was found that the Well K-02 incident was not the first. Several well incidents had been reported previously with significant impact and potential for serious accidents. This created the awareness that there might be a wider issue, and a comprehensive well-integrity study was initiated to obtain better insight into the well-integrity situation for all wells within the block. The scope of the study was the following.
- To evaluate the well-integrity status of all wells.
- To review the possible causes of the well-integrity problems.
- To generate workable engineering recommendations to extend the economic life of the production wells safely.
- To include well-integrity considerations in future well-planning and operation procedures.
- To build a comprehensive database of well-integrity condition and solutions.
Well Integrity. Well integrity, is defined as the application of technical, operational, and organizational solutions to reduce the risk of an uncontrolled release of formation fluids throughout the life cycle of a well. There are various facets to well integrity, including accountability/responsibility, well operating processes, well service processes, tubing/annulus integrity, Christmas-tree/wellhead integrity, and testing of safety systems. Well barriers are envelopes of one or several dependent well-barrier elements to prevent fluids or gases from flowing unintentionally from the formation into another formation or to surface. Interrupted barrier elements are related to well integrity and are crucial from the point of view of safety, but are also important concerning production regularity and cost. Lack of well maintenance may interfere with the well-barrier concept.
Well-Integrity Field Survey
The survey was conducted to compile a well-integrity database based on the status of the well barriers, using the following basis for evaluation.
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