ROTARY PULSER

摘要

An improved energy efficient intelligent rotary pulser for generating a mud pulse in a MWD (measurement while drilling) application. In the rotary pulser, a control circuit activates a brushless motor that rotates a windowed restrictor relative to a fixed housing to act as a shutter and window respectively. Opening of the windowed restrictor allows generally unrestrict ed mud flow. Closing of the windowed restrictor generally restricts mud flow. The windowed restricto r is powered both in opening and closing operations by the motor.