Rotary in-drilling alignment using an autonomous MEMS-based inertial measurement unit for measurement- while-drilling processes

The severe conditions of the drilling environment greatly limit technical options available to the equipment designer. Some desirable options cannot be used simply because they are too large for the restricted diameters available in drilling tools. Drilling would greatly benefit from inertial navigation solutions, but suitable conventional components cannot be used because of their physical size. This article describes work directed to the provision of improved navigation solutions for MWD applications.