Drilling systems and methods using radial current flow for...

Details Drilling systems and methods using radial current flow for... Drilling systems and methods using radial current flow for...

2011-07-19

2011-07-19

Patidar, Jay M (Department: 2858)

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

With radiant energy or nonconductive-type transmitter

Reexamination Certificate

active

07982464

ABSTRACT:
Systems and methods for look-ahead boundary detection and distance estimation are disclosed. In some embodiments, a drilling method includes extending a borehole with a drill string that includes a resistivity logging tool. The logging tool makes upward-looking and downward-looking resistivity measurements based on radial current flow. The upward looking and downward looking resistivity measurements are processed to estimate the distance to approaching bed boundaries, and drilling can be halted when the estimated distance reaches a desired value. Such information can be used to anchor casing at advantageous points and can further be used to avoid penetrating water-containing formations below a hydrocarbon reservoir.

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