Method of and apparatus for telemetering information from a point in a well borehole to the earth's surface
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United States of America
Stats
-
Jul 28, 1987
Grant Date -
N/A
app pub date -
Nov 6, 1979
filing date -
Mar 10, 1975
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Down-hole information from rotary well drilling operations is transmitted to a surface or remote location by the venting of drilling fluid from the interior of the drill stem into the bore hole annulus in a binary coded decimal format. A valve is caused to operate by the digital output of one or more down-hole transducers thus releasing and restoring the drilling fluid pressure in the desired sequence. A 'sub' contains the necessary electronics, power supply and a motorized valve assembly. Commands from the surface to transmit information from any one of the transducers are transmitted by means of sequential pulses in a binary coded decimal format, in the drilling fluid pressure are provided by the operator by deliberately decreasing and then increasing the surface pump pressure in a sequence to which the applicable down-hole actuating means is responsive.
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