Rotary steerable systems technology case studies in the Canadian Foothills: A challenging drilling environment ///

The Canadian foothills are situated in a challenging drilling environment with deep wells in hard, abrasive formations that lead to extended drilling time. Casing wear can occur in the upper sections, and special care must be taken to ensure casing integrity throughout the life of the well. Studies have shown that even slight doglegs in this vertical section lead to localized “hot spots,” where erosion of the casing is focused. Keeping the well straight in this highly dipping formation has been a priority for drilling companies and operators. Rotary Steerable Systems (RSS) have assisted in drilling wells in the Canadian Foothills. Using a “closed loop” feature, which automatically seeks a vertical profile in an openhole sidetrack with a carefully controlled dogleg severity (DLS), the rotary steerable tool is proving useful in drilling wells and reducing risks. This paper describes the use of RSS in drilling applications. Case studies illustrate RSS benefits.

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