Title:
Method for determining the top of abnormal formation pressures
United States Patent 3368400
US Patent References:
Drilling speed recorder
- - 2357051

Means for logging drilling rates
- - 2539758

Drilling rate logger
- - 2550420


Inventors:
Jorden Jr., James R.
Shirley, Orval J.
Publication Date:
02/13/1968
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Assignee:
SHELL OIL CO
Primary Class:
73/152.450
Other Classes:
175/50, 73/152.490
International Classes:
E21B45/00