Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Well logging
Patent
1991-11-22
1994-10-18
Moskowitz, Nelson
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Well logging
181105, 73155, G01V 140, G01N 2904
Patent
active
053574826
ABSTRACT:
A differential analysis method can be used to determine the presence or absence of a fluid in contact with a tubing string within a wellbore. The method uses a signal generator and detects tubing-perturbed signals, searches for an initial interfacial indicator within a window, axially aligns indicators within a data series as the detector traverses the tubing, discerns an adjacent interfacial indicator known to be incrementally changed by the presence of the fluid, and compares the adjacent indicators to the known incremental change. Even if the absolute location or condition of the interface is uncertain, the relative change indicates the presence or absence of fluid. A prior condition indicator can also be used to determine a second window for detecting an adjacent surface signal indicators. The arbitrary or prior condition baseline avoids the need to "know" the actual properties of intervening materials currently required for analysis of casing conditions and some of the extrapolation limitations inherent in current analysis methods. The method can also achieve accurate results by iterating on the initial indicator.
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Allen William C.
O'Sullivan Terence P.
Jacobson William O.
Moskowitz Nelson
Union Oil Company of California
Wirzbicki Gregory F.
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