Patent ID: 11920441
Assignee: MAGNETIC VARIATION SERVICES, LLC
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 15:
16. The system according to claim 15, further compromising instructions for:
combining the plurality of measurements from the plurality of offset well logs into one reference log;
taking a plurality of measurements at measured depths, MDsw along the borehole of the subject well;
selecting a plurality of offset well logs with measurements at true vertical depths, TVDow;
generating a mapping of true vertical depths, TVDow against stratigraphic vertical depth, SVDow, which relates a stratigraphic vertical depth, SVDow, to the corresponding true vertical depths, TVDow of the plurality of the offset well logs;
combining the measurements of the offset well logs into a common reference well log organized by stratigraphic vertical depth, SVDow;
computing the Misfit value, MV for each of a plurality of pairs of measurements at subject well measured depths, MDsw and reference well log stratigraphic vertical depth, SVDow;
determining, responsive to the misfit value, MV, the stratigraphic vertical depth of the subject well, SVDsw, by minimizing a cost related to the Misfit value, MV;
using the determined stratigraphic vertical depth, SVDsw, to steer the subject well to a desired stratigraphic vertical depth range; and
sending one or more control signals to the one or more control systems of the drilling rig to drill to the desired stratigraphic depth range.