SYSTEM AND METHOD FOR CONTROLLING A DOWNHOLE TOOL

摘要

A system and method for communicating with a downhole tool. A downhole tool includes a downlink receiver and a command actuator. The downlink receiver receives control information, encoded in rotation of the tool, that controls operation of the tool. The downlink receiver includes a rotation sensor and a decoder. The rotation sensor senses rotation of the tool about a longitudinal axis. The decoder 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 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 applies the control value to control operation of the tool.

主权项

1. A system for downhole communication, comprising:
a down hole tool comprising:
a downlink receiver to receive control information that controls operation of the downhole tool, the control information encoded in rotation of the downhole tool, the downlink receiver comprising:
a rotation sensor configured to sense rotation of the downhole tool about a longitudinal axis of the downhole tool; anda decoder configured to:
demarcate fields of the control information based on rotation state transitions sensed by the rotation sensor, wherein the rotation state transitions are transitions between a rotating state and a non-rotating state of the downhole tool; anddecode a control value for controlling the downhole tool based on a duration of a field of the control information, wherein the control value is wholly encoded in the field and the field is encoded as a non-rotating state of the downhole tool;a command actuator that applies the control value to control operation of the downhole tool.