| US 7,468,678 B2 | ||
| Downhole telemetry system for wired tubing | ||
| Vimal V. Shah, Sugar Land, Tex. (US); and Wallace R Gardner, Hosuton, Tex. (US) | ||
| Assigned to Halliburton Energy Services, Inc., Houston, Tex. (US) | ||
| Filed on Nov. 15, 2006, as Appl. No. 11/560,079. | ||
| Application 11/560079 is a division of application No. 10/879408, filed on Jun. 29, 2004, granted, now 7,180,825. | ||
| Prior Publication US 2007/0075874 A1, Apr. 05, 2007 | ||
| Int. Cl. G01V 3/00 (2006.01) | ||
| U.S. Cl. 340—855.3 [340/854.9; 367/82] | 8 Claims |
| 1. A communications method for use in a downhole communications system having repeaters, the method comprising:
listening for a first trigger signal at a first repeater in the downhole communications system;
determining if the first trigger signal identifies a link associated with the first repeater;
activating the first repeater if the first trigger signal identifies the link associated with the first repeater;
forwarding by way of the first repeater a second trigger signal to a second repeater;
establishing Discrete Multi-Tone(DMT)-signal links between the first repeater and the second repeater; and
sending a start command from a transmitter at the surface and thereby initiating communications along a communications path
that includes the DMT-signal links.
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