发明名称 |
WELL LOGGING COMMUNICATION SYSTEM |
摘要 |
<p>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 bidirectional 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 prescribed quantity of data.</p> |
申请公布号 |
CA1106022(A) |
申请公布日期 |
1981.07.28 |
申请号 |
CA19780296043 |
申请日期 |
1978.02.02 |
申请人 |
SCHLUMBERGER CANADA LIMITED |
发明人 |
BELAIGUES, ANTOINE G.;PAUMARD, ALAIN F.;DURAND, YVES;CALVERT, THOMAS |
分类号 |
E21B47/12;G01V11/00;G06F17/40;G08C19/00;H04L23/00;(IPC1-7):21B47/00 |
主分类号 |
E21B47/12 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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