Communications: electrical – Wellbore telemetering or control – Selective control of subsurface equipment
Patent
1985-05-06
1987-05-05
Jordan, Charles T.
Communications: electrical
Wellbore telemetering or control
Selective control of subsurface equipment
340856, 364179, 364422, G01V 100
Patent
active
046636285
ABSTRACT:
The method for controlling the rate at which a downhole logging tool samples and records a detected condition obtains three samples of the condition at three consecutive sample times and computes a prediction value for the n-th sample from the first three samples. The method compares the actual n-th sample with the predicted value and records the (n- 1)-th sample if the variance between the predicted and actual values is outside a predetermined threshold or difference. The sample rate is changed if the actual values of the samples remain within the predicted value's preselected range for more than a preselected number of samples. The sample rate interval is also increased if the battery life or memory capacity decrease below predetermined thresholds. The sample rate interval is decreased to its shortest interval if a pressure change above a predetermined threshold is detected.
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"NAPP Inc. Model 57 Wire Line Pressure Recorder" brochure.
"AMERADA EPG-512 Surface Recording Electronic Pressure/Temperature Gauge" brochure.
Duncan Richard L.
Forehand Gilbert H.
Lynch Michael J.
White Billy W.
Eldred John W.
Gilbert III E. Harrison
Halliburton Company
Jordan Charles T.
Walkowski Joseph A.
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