The Loss of Primary barrier: An Integrated Approach of Downhole Leak Location and Quantification. Case Study
- Maxim Volkov (TGT Oilfield Services) | Andrey Yurchenko (TGT Oilfield Services) | Remke Ellis (TGT Oilfield Services)
- Document ID
- Society of Petroleum Engineers
- SPE Nigeria Annual International Conference and Exhibition, 5-7 August, Lagos, Nigeria
- Publication Date
- Document Type
- Conference Paper
- 2019. Society of Petroleum Engineers
- 11 in the last 30 days
- 69 since 2007
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Failure of the primary barrier in most cases results in observable sustained annulus pressure. For other such cases, sustained annulus pressure may not result, and leak associated fluid movement remains confined to deeper intervals, for example as cross flows.
This manuscript introduces a comprehensive approach to assess the current status of primary and secondary barriers and, for this case of integrity loss, to quantify the downhole leaks rates. The assessment includes:
Determining individual pipe wall thickness of first two concentric metal barriers using electromagnetic pulse logging technique
Spectral Noise Logging to locate the active leaks and to verify the sealing integrity of cement barriers
High Precision Temperature logging for downhole leak rate quantification utilizing temperature modeling
The paper contains the physics of measurement, lab and field tests of the barrier assessment technologies, followed with a case study: A single string gas producer, with sustained A-annulus pressure. Additional survey findings allowed the identification and quantification of a crossflow resulting from leaks.
|File Size||3 MB||Number of Pages||20|
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