RLWI Deployed Electric Line Stroker Application for Safe and Secure Crown Plug Retrieval and Setting in High-Current Deep-Water Operations
- Stuart Murchie (Altus Intervention) | Erland Jørgensen (Altus Intervention) | Alexander Egeland (Altus Intervention) | Martin Saetrevik (Altus Intervention) | Erik Boge (Altus Intervention) | Knut Hals (A/S Norske Shell) | Andrea Sbordone (TIOS AS)
- Document ID
- Society of Petroleum Engineers
- SPE/ICoTA Well Intervention Conference and Exhibition, 26-27 March, The Woodlands, Texas, USA
- Publication Date
- Document Type
- Conference Paper
- 2019. Society of Petroleum Engineers
- 1.7.5 Well Control, 3 Production and Well Operations, 2.1.3 Completion Equipment, 3 Production and Well Operations, 1.7 Pressure Management, 1.6 Drilling Operations, 2.2 Installation and Completion Operations, 2.2 Installation and Completion Operations, 6.3 Safety
- Deep water, eLine, RWLI, Stroker, Crown plug
- 2 in the last 30 days
- 95 since 2007
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A/S Norske Shell needed to carry out tubing hanger crown plug (THCP) removal from a riserless light well intervention (RLWI) vessel in the Norwegian sector of the North Sea. There were concerns that the conventional application of mechanical jarring with slickline tools could not be used due to the combination of deep water and high sea currents in the specific field. A safer, more controlled and assured method was needed to withstand this extreme environment and provide the certainty of task success.
Theoretical studies and practical testing were conducted at the supplier's test site to verify the impact sea current had on cables and toolstring assemblies. Different scenarios were analysed and the most effective and lowest cost solution was determined. An electric line deployed and powered electrohydraulic stroker device was selected, which did not require any cable actuation to generate the pull forces required to unseat the crown plug.
Toolstring space-out was critical to ensure the stroker anchor was above and clear of the well control package (WCP) and positioned to prevent any inadvertent damage to the lubricator. In addition, a release tool and a shearable stem provided back-up safety capability for well control. A modification to an existing stroker was designed and a prototype built and tested at the onshore facility.
The final stroker toolstring design was tested out successfully on a more benign shallow subsea well, where the highly accurate force and movement control of the stroker, coupled with real-time surface readout, enabled a safe and secure crown plug pulling and installation operation. The targeted operation in a deep-water, high-sea current environment was then carried out successfully, applying many lessons learned and process improvements from the trial well.
In conclusion, the use of electrohydraulic stroker technology was proved to be a viable alternative for crown plug retrieval and setting operations, whilst bringing heightened visibility and control to such an operation.
|File Size||2 MB||Number of Pages||16|
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