Evaluation of A Passive Ultrasonic Log Application for Casing Integrity Assessment: A Case Study in A South Oman Field

Aditama, Prihandono; Mirza, Muhammad; Saadi, Hassan Al; Wardi, Abdullah Al; Aprilianto, Eko Cahyo; Broughton, Danny; Troup, Duncan

doi:10.2118/158575-ms

Cited by 5 publications

(1 citation statement)

References 4 publications

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“…In the previous chapters, the problem of bridging the research gap between the noiselogging approach [27], [102] and the acoustic-array approach proposed by Walters et al [20] was discussed in terms of extending these approaches' operating frequency in arrays (Chapter 3 and Chapter 4) and achieving localization using a single sensor (Chapter 5). Aside from localization, additional knowledge about leak phases can further enhance an operator's ability to resolve any well integrity problems at an early stage.…”

Section: Chapter 6 Leak Classification With An Svmmentioning

confidence: 99%

Acoustic signal processing for well integrity monitoring systems

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Section: Chapter 6 Leak Classification With An Svmmentioning

confidence: 99%

Acoustic signal processing for well integrity monitoring systems

Ang¹

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Strategic Rigless Approach in Identifying and Curing Complex and Multiple Completion Leaks in Malaysia

et al. 2013

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Integrity diagnostic has become one of the key prerequisite criteria when dealing with uncertainties in the well completion of mature assets. This is particularly true in Malaysia, where most of the tubing and casing in production wells has aged more than 30 years, and yet some of these wells are still producing beyond their original design life expectancy. Locating the source of integrity issues relies on being able to identify leaks and/or flow behind casing. Typically, conventional technologies have been used for anomaly detection, including spinners and temperature logs, downhole cameras, calipers and noise logs. In general these lack accuracy, with smaller leaks being particularly difficult to identify. Development studies pioneered in the well logging industry have led to a new diagnostic approach utilising high definition ultrasound technology. This has created a fast, accurate and reliable technique which can be used to identify leaks as small as 0.02 litres per minute inside the completion tubing. Field D and Field BN fields are two of PETRONAS Carigali Sdn. Bhd. (PCSB) mature fields where ultrasound technology has been implemented aggressively in order to mitigate complex completion problems involving tubing and annulus leaks. PCSB has successfully implemented this technology since 2008; to date the company has resolved more than 100 wells uncertainties using the method to determine multiple completion leaks and flow channelling behind casing. The ultrasound-based leak detection case histories demonstrate the practicality of the technique in many cased-hole applications. The related ultrasound-based flow-behind-pipe survey detects liquid or gas flow behind casing with a measurement from within the tubing. This unwanted flow can have a variety of negative outcomes, including poor well performance, ground water or reservoir contamination and/or more catastrophic uncontrolled fluid escape at surface. The diagnostic is sensitive to the ultrasound energy created by turbulent liquid or gas flow through small restrictions in annuli. From within the tubing, it can detect and locate undesirable flow behind pipe with great accuracy - even through multiple casing strings. This paper shares some experiences and best practices developed while implementing the technology in Field D and Field BN fields.

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Precise Well Integrity Diagnostic Delivers Production Sustainability, Cost Reduction and Regulatory Compliance

Leong

Anuar

Batumelai

et al. 2015

SPE/IATMI Asia Pacific Oil &Amp; Gas Conference and Exhibition

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This paper is a case study of a well intervention performed by PETRONAS Carigali Sdn Bhd (PCSB) in Sarawak region to investigate and rectify a breach in well integrity. The review and discussion demonstrate that the intervention not only ensured compliance with existing well bore risk management guidelines but also reduced operational rig cost and enabled increase in production. The paper identifies the aspects of what appears on first view to be a straightforward well integrity diagnostic process, but which on deeper evaluation exposes the wider and acute impact of the outcomes of such a diagnosis. The nature of the diagnostic technique is examined, and the interrelated impact on PCSB HSE requirements, platform operating efficiency, and field-wide production. The well intervention and the subsequent targeted rectification made possible by the precise nature of the diagnosis, enabled PCSB to bring this well back online and restore its gas production. This gas production is vital for several of the gas lifted wells in the field. Restoration enabled PCSB to increase field production significantly. The study concludes that accurate, reliable and rapid integrity diagnostics should not be evaluated as only relevant as a means of HSE management but also a means of cost management and in sustaining or increasing overall production.

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Evaluation of A Passive Ultrasonic Log Application for Casing Integrity Assessment: A Case Study in A South Oman Field

Cited by 5 publications

References 4 publications

Acoustic signal processing for well integrity monitoring systems

Acoustic signal processing for well integrity monitoring systems

Strategic Rigless Approach in Identifying and Curing Complex and Multiple Completion Leaks in Malaysia

Precise Well Integrity Diagnostic Delivers Production Sustainability, Cost Reduction and Regulatory Compliance

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