Tractor communication/control and select fire perforating switch simulations
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United States of America Patent
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Apr 8, 2014
Grant Date -
Nov 11, 2010
app pub date -
Jan 7, 2008
filing date -
Jan 6, 2007
priority date (Note) -
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status (Latency Note)
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Abstract
Apparatus and methods for controlling and communicating with one or more tools in a downhole tool string including a tractor, an auxiliary tractor tool, a logging tool, a safety sub, a release mechanism, a unit containing sensors for monitoring downhole conditions, a setting tool, and a perforating gun. Control and communication are accomplished by sending signals from the surface to control switches in the control units on the tool, with redundant switches for safety, to state machines in the respective control units, each state machine returning a signal verifying switch status to the surface. The state machine need not return a signal including a unique identifier.
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