Direct Sequence Spectrum Signal Downhole Tool
OwnerRyan Parasram, Adam Gresswell +3inventors
InventorsRyan Parasram, Adam Gresswell, Rich Warner, David Wadsworth, Nigel Prior
Life of this patent
Estimating the term…
Abstract
Embodiments described herein comprise a wellbore system having a controller, one or more downhole tools, and a conveyance configured to lower the one or more downhole tools into the wellbore. The one or more control nodes are located in at least one of the downhole tools and wherein the control nodes activate a portion of the downhole tool and data is exchanged between the control node and the controller using a direct sequence spread spectrum signal.
Claims20
A method for actuating a downhole tool, comprising:
- encrypting a command or commands;
- transmitting said encrypted command or commands from one or more controllers, via a conveyance, to one or more control nodes in at least a portion of at least one downhole tool using a direct sequence spread spectrum signal (DSSS) transceiver with telemetry;
- receiving said encrypted command or commands at one or more control nodes in a wellbore;
- decrypting said encrypted command or commands at one or more control nodes;
- determining the decrypted command is valid for the specific control node or nodes;
- determining said decrypted command is valid for the specific control node task;
- and
- actuating, or performing the defined action, actions, task or tasks, in the targeted control node or nodes.
A method for using the head voltage on a control node to set the state of the inline bus switch wherein (a) the initial head voltage sets the default state of the inline bus switch at power up, (b) a change of state of the inline bus switch may be initiated after power up with a command, or, (c) after power up, the head voltage may change the inline bus switch's state directly.
A method of communication synchronization, for start-of-frame, by forcing a separation of total and match energies in the Direct Sequence Spread Spectrum (DSSS) demodulator for a specific length of time.
Dependencies are inferred from the claim text.