Title:
SYSTEM AND METHOD FOR CONTROLLING A DOWNHOLE TOOL
Document Type and Number:
WIPO Patent Application WO/2014/153460
Kind Code:
A3
Abstract:
A downhole tool (126) including a downlink receiver (128) and a command actuator (308, 310). The downlink receiver (128) receives control information, encoded in rotation of the tool, that controls operation of the tool. The downlink receiver (128) includes a rotation sensor (214) and a decoder (308). The rotation sensor senses rotation of the tool about a longitudinal axis. The decoder (308) demarcates fields of the control information based on rotation state transitions sensed by the rotation sensor. The rotation state transitions are transitions between a rotating state and a non-rotating state. The decoder (308) also decodes a control value for controlling the tool based on a duration of a field of the control information. The control value is wholly encoded in the field, and the field is encoded as a non- rotating state of the tool. The command actuator (308, 310) applies the control value to control operation of the tool.
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Inventors:
CLAUSEN JEFFERY (US)
PRILL JONATHAN RYAN (CA)
ZEWAIL RAMI (CA)
PRILL JONATHAN RYAN (CA)
ZEWAIL RAMI (CA)
Application Number:
PCT/US2014/031334
Publication Date:
March 05, 2015
Filing Date:
March 20, 2014
Export Citation:
Assignee:
NAT OILWELL VARCO LP (US)
International Classes:
E21B7/06; E21B47/12; E21B47/16
Foreign References:
| US20050001737A1 | 2005-01-06 | |||
| US20060185900A1 | 2006-08-24 | |||
| GB2352743A | 2001-02-07 | |||
| US20110286309A1 | 2011-11-24 |
Attorney, Agent or Firm:
WILSON, David M. (P.C.P.O. Box 326, Houston Texas, US)
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