Well logging system arranged for stable,high-sensitivity reception of propagating electromagnetic waves
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Computer-controlled model for determining internal friction angle, porosity, and fracture probability
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Externally mounted radioactivity detector for MWD
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Downhole vibration monitoring of a drillstring
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Apparatus for well logging telemetry
WO8807212A1
Well logging system employing focused current in measuring resistivity while drilling
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Method and apparatus for compensating for drilling line stretch in determining equipment depth in a well and for measurement of hookload on the traveling block of a drilling rig
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Apparatus for well logging telemetry
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Noise subtraction filter
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Data encoding and synchronization for pulse telemetry
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Noise subtraction filter
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Transmitting well logging data
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Transmitting well logging data
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Transmitting well logging data
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Data encoding and synchronization for pulse telemetry
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Noise subtraction filter.
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Apparatus for well logging while drilling
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Direct current control in inductive loads
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Well logging apparatus and method for making same
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Well logging apparatus with replaceable sensor carrying insulating sleeve disposed in rotation restrained position around a drill string
