A major service provider was drilling in a high angle East/West environment and was unable to tie in the MWD at the start of the 12 1/4” section of the well. Due to the widening Ellipse of Uncertainty (EOU) at the 8 1/2” section, many of the proposed well designs were insufficient to continue operations and adhere to the anti-collision requirements. Based on the performance and operational constraints of conventional magnetic and north-seeking survey systems, the options for reducing the overall positional uncertainty and achieving the necessary increase in separation factor were limited. Gyrodata recommended that the GyroGuide All-Attitude system be deployed, as it surveys at all inclinations with significantly improved accuracy. This system was selected to perform an 8 1/2” hole

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