G - Physics – 06 – G
Patent
G - Physics
06
G
354/143, 354/21
G06G 7/02 (2006.01) E21B 47/00 (2006.01) E21B 47/12 (2006.01) G06F 17/40 (2006.01)
Patent
CA 1249665
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 prese- lected 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.
508444
Duncan Richard L.
Forehand Gilbert H.
Lynch Michael J.
Richardson John M.
White Billy W.
Company Halliburton
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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