The high definition trajectory is needed to compensate for the TVD error due to the Stockhausen effect [1] and to build the geological model more correctly. To calculate the high-definition trajectory, MWD STD system uses the fusion algorithm of static surveys with continuous inclination measurements: the inclination continuum is filtered by the DLS filter and morphed to fit static measurements. This approach compensates for continuous measurement errors and temperature drift of the total G.
The MWD STD system can represent a high-definition trajectory with a full set of measurements (static and all continuous) as well as a compact representation. For the compact representation, the system adds to the static surveys only those continuous inclination stations at which the trajectory changes its trend. This approach allows to significantly reduce the amount of data for representing the trajectory, while retaining information about the micro-profile of the well.
1. Stockhausen, E.J., Lesso, W.G., 2003, Continuous Direction and Inclination Measurements Lead to an Improvement in Wellbore Positioning, SPE/IADC 79917