Abstract
Abstract The allure of a gyroscopic directional sensor for MWD (Measurement While Drilling) operations has spanned over two decades now. The authors first investigated potential sensors for MWD applications in 1982 and were disappointed to find technological limitations precluded such a device. Why is it so difficult to build a gyroscope into an MWD tool, and why don't we have one available for commercial use in the industry today? Also, what should oil companies expect from a service company who promises an "MWD Gyro Tool" in the next year or two? Currently there are several service companies working on directional modules that incorporate some type of gyroscopic sensor and promise to provide an indication of "True North" direction in conjunction with MWD tools. This paper is intended to establish realistic expectations for the performance that might be delivered by these early gyroscopic tools in the harsh MWD environment. The paper also describes the investigation, specification, design decisions, and testing done in the development of a tool to meet the most common application requirements for an MWD Gyro. Initial testing of the tool has proven it surprisingly accurate and at least as robust as existing conventional mag/accel sensors. Extensive qualification testing in both lab and field settings has proven the instrument capable of surviving the harsh MWD environment.
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