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

Claim 2:
3. The method according to claim 2, wherein the plurality of measurements from the plurality of offset well logs are combined into one reference log, and the method further comprising:
taking a plurality of measurements at the plurality of 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 plurality of the offset well logs into a common reference well log organized by stratigraphic vertical depths of the offset well logs, 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 organized by stratigraphic vertical depths, SVDow;
determining, responsive to the computed misfit value, MV, the stratigraphic vertical depth of the subject well, SVDsw, wherein the stratigraphic vertical depth, SVDsw is determined to correspond to a minimum cost produced by the Misfit value, MV; and
using the determined stratigraphic vertical depth, SVDsw, to steer the subject well to a desired stratigraphic depth range.