Recent new capability
Elemental Analysis and Chemostratigraphy Services
Ellington & Associates, Inc. and Chemostrat Inc. have formed and alliance to provide elemental analysis and chemostratigraphy from a base in Houston, Texas.
The Houston based lab is the first commercial XRF elemental service based in the U.S.
more..
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Overview
When drilling is stopped (or while drilling), the acoustic source, mounted on a drillstring, generates a pressure pulse. This excites both tube waves within the borehole and acoustic waves in surrounding formation. The resulting acoustic waves propagate through the formation, experiencing partial reflection on existing acoustic boundaries. Upon reaching borehole walls the reflected waves excite corresponding tube waves, which are being registered by receivers mounted on the drillstring. While incident and reflected waves propagate in formation, tube waves propagate within borehole reflecting from stabilizers and the bottom of the hole, disturbing reception of useful signal as well as exciting additional waves in formation.
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Applications
 Acoustic navigation systems are used for determining location
of bit relative to formation boundaries during horizontal and
directional drilling.
Simulator helps studying physical processes and interpreting
the measurement results.
Determine requirements to the source and receivers.
Assists in finding the optimal parameters of the tool.
Optimize relative locations of transmitter and receiver to
minimize signal disturbance.
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Setup
Well Parameters.
Source Parameters.
Receiver Parameters.
Mud Parameters.
Saturated Formation.
Elastic Formation.
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Results: Wave Charts
Screenshots below have been obtained for the following compression and shear waves:
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Compression wave at 1.3 msec
Shear wave at 1.3 msec
 
Compression wave at 2.7 msec
Shear wave at 2.7 msec
 
Compression wave at 3.5 msec
Shear wave at 3.5 msec
 
Compression wave at 4.3 msec
Shear wave at 4.3 msec
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Results: Reflected Signal
Reflected Signal, measured on two receivers
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