Intelligent efficient servo-actuator for a downhole pulser
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United States of America Patent
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-
Jun 19, 2012
Grant Date -
Oct 30, 2008
app pub date -
Jul 3, 2008
filing date -
Apr 6, 2004
priority date (Note) -
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status (Latency Note)
Importance
Abstract
An improved energy efficient intelligent pulser driver used for generating a mud pulse in a MWD (measurement while drilling) application. In the pulser driver, a direct current (DC) powered control circuit activates a three-phase DC brushless motor that operates a servo-valve. Opening of the servo-valve equalizes pressure in a plenum causing the operation of a main valve reducing flow area and causing a pressure spike in the mud column. Closing of the servo-valve creates a reduction in mud pressure that operates the main valve and increases the flow area causing an end to the pressure spike. The servo-valve is powered both in opening and closing operations by the motor.
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