Acoustic logging while drilling tool to determine bed boundaries

Acoustic method of connecting boreholes for multi-lateral comple

Acoustic position measurement system for well bore formation

Acoustic system to guide a coal seam auger

Adaptive apparatus, system and method for communicating with...

Angle sensor using thermal conductivity for a steerable boring t

Apparatus and method for detecting a location and an orientation

Apparatus and method for drilling into the sidewall of a drill h

Apparatus and method for forming ducts and passageways

Apparatus and method for horizontal drilling

Apparatus and method for orienting and setting a hydraulically-a

Apparatus and method for simultaneously locating a fixed...

Apparatus and method for simultaneously locating a fixed...

Apparatus and method for the dynamic measurement of a drill stri

Apparatus and method for tracking multiple signal emitting...

Apparatus for arcuate drilling

Apparatus for detecting position of underground excavator

Apparatus for guiding and steering earth boring casing

Apparatus for guiding and steering earth boring casing

Apparatus for making a subterranean tunnel