On a recent well in the Middle Bakken Dolomite, Williston Basin, North Dakota, an operator struggled to effectively geosteer a horizontal well. The geology, while usually relatively simple, proved to be more complex than anticipated. While drilling, the wellbore was steered out of zone, requiring an open-hole sidetrack. After successfully sidetracking, the well was steered out of zone a second time, requiring a repeat of the sidetrack.

At this point, the operator elected to deploy a comprehensive geosteering service, which consisted of an azimuthal resistivity tool, dedicated geosteering software, and associated geosteering personnel. Once the tools were delivered to the rig site, all data was transmitted offsite to the geosteering specialists for analysis in real time.

The second side track was successfully drilled to TD with no further sidetracks. This demonstrates the ability to rapidly deploy, on short notice, a fit-for-purpose solution to assist operators in accurately positioning wells in the Middle Bakken with a substantial reduction in cost and risk.

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