E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
324/8, 340/93
E21B 47/00 (2006.01) E21B 47/12 (2006.01) G01V 11/00 (2006.01)
Patent
CA 1106022
Abstract of the Disclosure A communication system capable of continuously exchanging digital information in a well logging installation between apparatus arranged on the earth's surface and apparatus arranged in an earth borehole, interconnected by a cable. Both the surface apparatus and the downhole apparatus include a controller and a modem for sending digital command messages downhole and digital data messages uphole. The downhole apparatus also includes one or more tools which are coupled in parallel to the downhole controller via a bi- directional bus. Each tool has a universal (identical) interface adapted to recognize a specific address unique to itself and a universal address common to all interfaces. A command message with a universal address may activate all of the tools in a "free-running" mode to transmit a predetermined quantity of data in a predetermined sequence. A command message having a specific address and an indication of the length of the data desired may activate a specific one of the tools in a "command-response" mode to transmit the pre- scribed quantity of data.
296043
Belaigues Antoine G.
Calvert Thomas
Durand Yves
Paumard Alain F.
Schlumberger Canada Limited
Smart & Biggar
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