Method and apparatus for three dimensional geosteering

Details Method and apparatus for three dimensional geosteering Method and apparatus for three dimensional geosteering

2011-06-14

2011-06-14

Stephenson, Daniel P (Department: 3676)

Boring or penetrating the earth

With signaling, indicating, testing or measuring

C175S045000, C324S346000, C324S348000, C340S854600, C702S009000

Reexamination Certificate

active

07958949

ABSTRACT:
A technique for drilling a borehole includes obtaining data from a tool in the borehole for a plurality of positions in the borehole that is being drilled to form acquired data indicative of directional electromagnetic propagation measurements. The technique includes identifying a plurality of distances to a boundary between formations in ground from the plurality of positions in the borehole based on the measurements; identifying a trajectory of the borehole using the plurality of distances; and deciding whether to change the trajectory of the borehole using a change in the plurality of distances between the trajectory and the boundary. The trajectory of the borehole may be changed in both inclination and azimuth.

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