Improving the Understanding, Application and Reliability of the Perforate, Wash and Cement Technique through the Use of Cement Bond Logs, Tool Enhancements and Barrier Verification via Annular Pressure Monitoring
- Alexander Lucas (Total E&P Danmark A/S) | Thore Andre Stokkeland (Archer-The Well Company) | David Jackson (Total E&P Danmark A/S) | Scott Ingram (Baker Hughes)
- Document ID
- Society of Petroleum Engineers
- SPE Annual Technical Conference and Exhibition, 24-26 September, Dallas, Texas, USA
- Publication Date
- Document Type
- Conference Paper
- 2018. Society of Petroleum Engineers
- 3 Production and Well Operations, 2.2.2 Perforating, 2.1.3 Completion Equipment, 2 Well completion, 2.2 Installation and Completion Operations, 3 Production and Well Operations
- Annulus remediation, Perforate, Wash and Cement, Plug and Abandonment, Slot Recovery, Workover
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The Perforate, Wash and Cement technique has been widely applied to remediation of annular cement in recent years. Since 2012, extensive experience in the different technologies currently available on the market has been obtained across ten fields in the Danish and UK sectors of the North Sea and the data obtained has been used to attempt to better understand the effective operational window for the technique, and also further enhance reliability and tool robustness.
The run data obtained from several wells has been calibrated against cement bond logging (CBL) responses so that the degree of annular bonding as inferred from the logs may be expressed in terms of the degree to which hydraulic communication or circulation is permitted via perforations and along the annulus. This in turn helps clearer decision criteria to be defined prior to execution that aids in the selection of the most appropriate method for remediating the cement, since Perforate, Wash and Cement may not be the most suitable technique in every case.
Given the criticality of cement remediation to the long-term success of zonal isolation, it is important to demonstrate that effective hydraulic communication with the annulus has been established during the washing phase to ensure that the zonal isolation medium (cement) can be effectively placed and the hydraulic seal re-established, resulting in successful remediation.
Post-execution verification of the effectiveness of remediation is typically performed via Cement Bond Logging. However, this may not always be a definitive verification step since Cement Bond Logging interpretation does have its limitations (both physical and interpretative), and hence annuli have occasionally been known to develop Sustained Casing Pressure even shortly after positive log interpretations following well-executed cementations.
This paper therefore further demonstrates how Sustained Casing Pressure monitoring can be used as a further criterion to verify the integrity of the remediated annulus and hence conclusively demonstrate whether the washing and later cementing of the annulus has been effectively performed. This in turn is used as definitive confirmation that zonal isolation has been performed within the operating limits of the tool and hence qualify Perforate, Wash and Cement as a robust and viable remedial method.
|File Size||4 MB||Number of Pages||37|
Anasari, A. A., Ringrose, D., Libdi, Z., Larsen, A. (2016), Extending Life for Offshore Wells by Fixing the Integrity High Annulus-B Pressure and Creating Zonal Isolation Using a Novel Remediation Technique, IADC/SPE 180555, IADC/SPE Asia Pacific Drilling Technology Conference and Exhibition held in Singapore, 22-24 August 2016.
Ferg, T.E., Lund, H., Mueller, D., Myhre, M., Larsen, A., Andersen, P., Lende, G., Hudson, C., Prestegaard, C., Field, D. (2011), Novel Approach to More Effective Plug and Abandonment Cementing Techniques, Society of Petroleum Engineers, SPE 148640, SPE Arctic and Extreme Environments Conference and Exhibition held in Moscow, Russia, 18-20 October 2011.
Joneja, G., Nafikova, S., Reid, J., Rublevskyi, A., Salazar, J. (2018), Perf-and-Wash Cement Placement Technique as a Cost-Effective Solution for Permanent Abandonment of a Well With Multiple Permeable Zones: A Case Study from North Sea, UK, IADC/SPE-189580-MS, IADC/SPE Drilling Conference and Exhibition held in Fort Worth, Texas, 6-8 March 2018.