Depth determination system utilizing parameter estimation for a downhole well logging apparatus
Patent
·
OSTI ID:5117804
This patent describes a method of correcting a depth reading produced from a depth wheel when a well logging tool, suspended from a cable, is lowered into or drawn from a borehole of an oil well, the well logging tool including an accelerometer means for producing an acceleration output signal indicative of the instantaneous acceleration of the tool along the axis of the borehole. It comprises: estimating a set of resonance parameters associated with a resonance behavior of the tool-cable system when the tool is disposed at an approximate depth in the borehole in response to the output signal from the accelerometer means indicative of the instantaneous acceleration of the tool; producing a correction factor in response to the set of resonance parameters; and correcting the depth reading from the depth wheel using the correction factor to perform the correction.
- Assignee:
- Schlumberger Technology Corp., Houston, TX (USA)
- Patent Number(s):
- A; US 5019978
- Application Number:
- PPN: US 7-240025
- OSTI ID:
- 5117804
- Country of Publication:
- United States
- Language:
- English
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