Actuation method
Analysis and identification of a drilling fluid column based on
Apparatus and method for determining boring direction when borin
Apparatus and method for positioning a tool in a deviated sectio
Apparatus and method for positioning a tool in a deviated sectio
Apparatus for electromagnetically coupling power and data signal
Apparatus for locating a member in a borehole
Borehold telemetry system
Borehold telemetry system
Coal boundary detection using an electric-field borehole...
Common interface architecture for horizontal directional...
Common interface architecture for horizontal directional...
Communications system having redundant channels
Controlling an underground object
Controlling an underground object
Data transmission system
Downhole power generation and communications apparatus and...
Drill string rotation encoding
Drilling assembly with reduced stick-slip tendency
Dual spectra well logging system