E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
73/164, 166/3, 3
E21B 47/00 (2006.01) E21B 47/04 (2006.01) E21B 47/12 (2006.01) E21B 49/00 (2006.01) G01V 11/00 (2006.01)
Patent
CA 1091471
Abstract of the Disclosure. A self-contained, battery powered well logging instrument is pumped down the interior of a drill pipe string having a catcher subs at its lower end. When the logging instrument latches into the catcher sub, the pumped fluid circulation is blocked, after which increased pump pres- sure switches a valve assembly to recreate circulation and energize the logging instrument to the standby position. An accelerometer in the logging instrument detects the upward move- ment of the instrument and switches the circuitry from standby to the record mode. The output from a clock controlled by the downhole accelerometer is recorded along with logging infor- mation and is synchronized with pipe footage measurements and with a similar such accelerometer and clock at the earth's sur- face which are responsive to the movement of the pipe string at the earth's surface. The recorded logging samples are thus related to true depth by correlating with the data simultaneous- ly recorded at the earth's surface. As an alternative embodi- ment, logging instrument is attached to the drill pipe prior to running the pipe into the borehole. As an additional embodi- ment, a logging instrument is provided having a variable output accelerometer and associated circuitry which provides depth information independently of the equipment at the earth's surface.
275414
Dresser Industries Inc.
Macrae & Co.
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