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 deepwater, 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.
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机译：A / S Norske Shell需要在北海的挪威行业的无异石井干预（RLWI）船上进行管道悬挂器冠塞（THCP）。担心由于在特定领域的深水和高海流的组合，因此不能使用与光滑工具的机械跳线的常规应用。需要更安全，更受控和保证的方法来承受这种极端环境，并提供任务成功的确定性。在供应商的测试站点进行了理论研究和实际测试，以验证电缆和工具组件的冲击海流。分析了不同的情景，并确定了最有效和最低的成本解决方案。选择了一条电力线和动力的电液钻头装置，其不需要任何电缆致动以产生所需的拉力所需的拉力。 Toolstring Space-Out是至关重要的，以确保施用锚杆上方和清除井控制封装（WCP）并定位以防止对润滑器的任何无意损坏。此外，释放工具和可涂层杆提供了备用控制的备用安全性。设计了对现有令人司机的修改，并在陆上设施中建造和测试了原型。最终的聊天工具设计在更良好的浅水区上成功进行了测试，其中，具有实时表面读出的股票的高精度力和运动控制，使得能够安全和安全的皇冠插头拉动和安装操作。然后，在深水中进行的目标操作，然后成功地进行了成功，应用了许多经验教训和从试验的过程改进。总之，证明了电液串技术的使用是皇冠插头检索和设定操作的可行替代方案，同时使可见性提升和控制到这种操作。
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