This paper describes the planning, execution, improvements, and results from a multi-well fishing campaign using a snubbing unit on pressurized H2S wells for a national oil company (NOC) in the Middle East. A suitable blow out preventer (BOP) stack is shown for fishing coiled tubing, wireline tools, and milling along with the contingencies considered and how these were incorporated into the design of the stack. The challenges encountered during the execution phase are explained along with the solutions implemented. The key performance indicators used and how these improved the operational efficiency during the campaign are discussed. The well problems, desired results, and actual results of the interventions on the wells completed to date are shown.
Number of Pages
Kang, B. I., Murugappan, B. S., Kwon, O., Sinn, G. J., Foster, I., Robinson, L., … McKinnon, B. L. (2010, January 1). Fishing Coiled Tubing From a Live Gas Condensate Well With Coiled Tubing While Under Production. Society of Petroleum Engineers. doi: 10.2118/129507-MS
McDaniel, R. (2015, March 24). Fishing Coiled Tubing With Internal Weld Seams and Failed BPVs in a Live Well Environment Using Hydraulic Workover (HWO). Society of Petroleum Engineers. doi: 10.2118/173690-MS
Sanders, H., & Sredensek, E. (2013, March 26). Job Planning and Execution When Fishing Live Perforating Guns With 8,000-psi Surface Pressure. Society of Petroleum Engineers. doi: 10.2118/163916-MS
Sredensek, E., & Bruin, E. (2014, March 25). Design Enhancements to Snubbing Unit Surface Equipment Delivers Improved Operational Efficiency and Safety. Society of Petroleum Engineers. doi: 10.2118/168269-MS
Wattanasuwankorn, R., Daohmareeyor, T., Kritsanaphak, K., Pathmanathan, I., & Bohorquez, J. (2018, August 24). Successful Snubbing Application Performed Underbalanced Fishing of Parted Coiled Tubing in Live High-Pressure Well: Offshore Vietnam. Society of Petroleum Engineers. doi: 10.2118/191013-MS
Looking for more?
Some of the OnePetro partner societies have developed subject- specific wikis that may help.