Cathodic Protection Effectiveness Evaluation in ADCO Wells Utilizing Multi-Barrier Magnetic Defectoscopy
- A. Yugay (Abu Dhabi Co for Onshore Petroleum Operations Ltd) | H. B. Daghmouni (Abu Dhabi Co for Onshore Petroleum Operations Ltd) | A. B. Ali (Abu Dhabi Co for Onshore Petroleum Operations Ltd) | T. K. Gupta (Abu Dhabi Co for Onshore Petroleum Operations Ltd) | S. P. R. Grandhe (Abu Dhabi Co for Onshore Petroleum Operations Ltd) | M. Volkov (TGT Oil & Gas Services)
- Document ID
- Society of Petroleum Engineers
- SPE Abu Dhabi International Petroleum Exhibition & Conference, 13-16 November , Abu Dhabi, UAE
- Publication Date
- Document Type
- Conference Paper
- 2017. Society of Petroleum Engineers
- 0.2 Wellbore Design, 2.10 Well Integrity, 1.14 Casing and Cementing, 2.10.4 Subsurface Corrosion, 4.2.3 Materials and Corrosion, 2 Well completion, 1.14.1 Casing Design
- well barrier, corrosion, cathodic protection, corrosion logging, well integrity
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- 39 since 2007
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The objective of the project is to evaluate effectiveness of the Cathodic Protection (CP) as a corrosion reducing solution after several years of implementation. The project has been initiated based on the Well Integrity Records and Requirements.
5 wells in different Company's fields have been selected to demonstrate the effectiveness of Cathodic Protection. The wells are characterized by different casing design, age, and time of CP installation. The wells represent distinctive fields, where similar integrity issues are observed, such as intense casing corrosion due to lack of isolation and exposure to corrosive environment. Analysis of CP performance is based on actual metal loss identified in 9-5/8″ and 13-3/8″ casings using multi-barrier electromagnetic metal loss evaluation tool. The statistical analysis was performed to correlate the corrosion rate with different key parameters and to evaluate how effective the CP is during the well life cycle.
Several observations were made based on the logging results and statistical analysis. The areas protected by CP demonstrated lower corrosion rates. A clear correlation was observed between the corrosion progress and the period of time the wells were operated without CP. 13 3/8″ casing is relatively more protected compared to 9 5/8″ since the CP effectiveness attenuates with depth and becomes less effective below the 13 3/8″ casing shoe. The corrosion zones identified in several wells in 9 5/8″ casing inside 13 3/8″ clearly confirm that CP is effective only for the outer casing surfaces and does not protect from internal corrosion. Cement quality and bonding also affect the CP performance. The recommendation was given to implement the CP system in all currently unprotected wells and those to be drilled in future.
The results of the conducted study clearly demonstrate effectiveness of Cathodic Protection system in reducing corrosion in well casings. It also helps to identify system limitations and key parameters affecting its efficiency. This paper might be interesting to other Companies with similar well integrity problems due to corrosion.
|File Size||1 MB||Number of Pages||10|
Hisham Ibrahim Al Shuwaikhat(Saudi Aramco), Saad M. Al-Driweesh(Saudi Aramco), Ahmed K. Al-zain(Saudi Aramco), Shaker Abduallah Al Buhassan(Saudi Aramco) | Ibrahim M. Zefzafy(Saudi Aramco) | Hasan Al-Tammar, 2009, Middle East Drilling Technology Conference & Exhibition, 26-28 October, Manama, Bahrain.
Arsalan A. Ansari, ZiadLibdi, Naeem Khan, Zakum Development Co.; Arthur Aslanyan, Irina Aslanyan, Maxim Volkov, Andrey Arbuzov, Andrey Achkeev, Fathi Shnaib, Ruslan Makhiyanov, TGT Oilfield Services, 2015, Triple-barrier thickness scanning using through-tubing pulse-magnetic logging tool, Abu Dhabi International Petroleum Conference and Exhibition, Abu Dhabi, UAE, 26-28 Oct.
Aslanyan, A.M, Aslanyan, I.Y, Arbuzov, A.A, Zagidullin, B.,Al-Rahawi, T.A.,Prosvirkin, S.,Al-Ajmi, M.F.,Awad, M.O.,Sharma, S.S.,Das, M. 2014. Time-Domain Magnetic Defectoscopy for Tubing and Casing Corrosion Detection. SPE International Oilfield Corrosion Conference and Exhibition, Aberdeen, Scotland, 12-13 May.