Winterization and drilling operations in cold climate areas

Abstract

Petroleum operations in remote locations offshore off northern Norway call for technical and operational solutions, sustainable and capable of withstanding extreme and harsh weather conditions. This paper discusses hazards, risks and winterization measures when working in cold climate and presents a wind chill study performed on a semi-submersible drilling rig, when operating southwest in the Barents Sea. The objective of that study was to evaluate the winterization measure of partly enclosing the drill floor, with regards to the risk of hypothermia and operational restrictions. Five independent measurements of wind chill temperatures were performed, during a period from May to February. Information were also gathered in conversations with personnel working on the floor. It was found from the temperature measurements that the working area became less exposed for wind turbulence and the effect of wind chill after the enclosure. Feedback from personnel working in the area confirmed the findings. The passive winterization measure of partly enclosing the drill floor showed to be an effective safeguard for personnel against heat loss and the risk of hypothermia. In addition, operational restrictions with respect to working hours at lower temperatures could be reduced.