Communications – electrical: acoustic wave systems and devices – Wellbore telemetering – Through well fluids
Patent
1986-10-08
1988-05-03
Moskowitz, Nelson
Communications, electrical: acoustic wave systems and devices
Wellbore telemetering
Through well fluids
367 83, G01V 140
Patent
active
047424982
ABSTRACT:
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 creates 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.
REFERENCES:
patent: 3571936 (1971-03-01), Taylor, Jr.
patent: 4184545 (1980-01-01), Claycomb
patent: 4351037 (1982-09-01), Scherbatskoy
patent: 4371958 (1983-02-01), Claycomb
patent: 4386422 (1983-05-01), Mumby et al.
patent: 4520468 (1985-05-01), Scherbatskoy
Eastman Christensen Company
Lobo Ian J.
Moskowitz Nelson
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