Title:
ROTARY OPERATION SHEARING VALUE FOR WELL DRILLING FLUID REMOTE COMMUNICATION APPARATUS
Document Type and Number:
Japanese Patent JPS60219386
Kind Code:
A
Abstract:
A mud pulse telemetry system for imparting data pulses to drilling fluids circulating in a drill string including an improved valve arrangment for modulating the pressure of the circulating drilling fluid is disclosed. A rotary acting shear-type valve is arranged in a through conduit configuration so that the seat face of the valve is covered when the valve is in an open position, thus preventing impingement of abrasive fluid particles on the valve seat face during the open flow position of the valve. The rotatable gate is positively driven through an arc in opposite directions by rotary solenoids so that a gate aperture is moved into and out of axial alignment with the opening in the valve seat to generate the pressure pulse. The rotary solenoid valve also permits a tailoring of the force curve of the solenoid for maximum power in actuation of larger flow orifices. The larger flow orifice permits generation of pressure pulses of increased amplitude.
Inventors:
MAIKERU ERU RAARONDE
Application Number:
JP6222485A
Publication Date:
November 02, 1985
Filing Date:
March 28, 1985
Export Citation:
Assignee:
NL INDUSTRIES INC
International Classes:
E21B47/18; E21B21/08; (IPC1-7): E21B21/08
Attorney, Agent or Firm:
Matsuhiro Masahiro