E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
255/25
E21B 21/00 (2006.01) E21B 47/18 (2006.01)
Patent
CA 1259981
ABSTRACT OF THE DISCLOSURE Apparatus for and a method of creating positive pressure pulses in a stream of drilling mud being circulated through a drill string is disclosed. The apparatus includes a restriction in the drill string, a valve member located below the restriction, a cylinder located in the drill string above the restriction, a valve stem connected to the valve member and extending upwardly through the restriction into the cylinder, a piston located in the cylinder and connected to the valve stem, and a restricted passage through the piston through which drilling mud can flow and equalize the pressure across the piston. In operation, opening a pilot valve allows the fluid above the piston to flow through the piston rod to the drill string below the restriction. This creats a pressure differential across the piston that moves it upwardly and causing the valve member to further restrict flow through the valve seat. This creates a pressure pulse. Closing the pilot valve, equalizes the pressure across the piston allowing it and the valve member to move back to their original positions.
543331
Eastman Christensen Company
Finlayson & Singlehurst
LandOfFree
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