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Class Information
Number: 367/84
Name: Communications, electrical: acoustic wave systems and devices > Wellbore telemetering > Through well fluids > Rotary valve control
Description: Subject matter wherein the acoustic waves are generated by rotational movement of structure which modulates the well fluid flow.










Patents under this class:
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Patent Number Title Of Patent Date Issued
8693284 Apparatus for creating pressure pulses in the fluid of a bore hole Apr. 8, 2014
8514657 Generating fluid telemetry Aug. 20, 2013
8485264 Multi-stage modulator Jul. 16, 2013
8474548 Measurement while drilling apparatus and method of using the same Jul. 2, 2013
8467268 Pressure release encoding system for communicating downhole information through a wellbore to a surface location Jun. 18, 2013
8251160 Measurement while drilling apparatus and method of using the same Aug. 28, 2012
8203908 Intelligent efficient servo-actuator for a downhole pulser Jun. 19, 2012
8151905 Downhole telemetry system and method Apr. 10, 2012
7881155 Pressure release encoding system for communicating downhole information through a wellbore to a surface location Feb. 1, 2011
7839719 Fluid erosion protection washer for rotating shaft in MWD tool Nov. 23, 2010
7808859 Oscillating shear valve for mud pulse telemetry Oct. 5, 2010
7735579 Measurement while drilling apparatus and method of using the same Jun. 15, 2010
7719439 Rotary pulser May. 18, 2010
RE40944 Adjustable shear valve mud pulser and controls therefor Oct. 27, 2009
7564741 Intelligent efficient servo-actuator for a downhole pulser Jul. 21, 2009
7532540 Fluid erosion protection washer for rotating shaft in MWD tool May. 12, 2009
7468679 Method and apparatus for mud pulse telemetry Dec. 23, 2008
7405998 Method and apparatus for generating fluid pressure pulses Jul. 29, 2008
7400262 Apparatus and methods for self-powered communication and sensor network Jul. 15, 2008
7327634 Rotary pulser for transmitting information to the surface from a drill string down hole in a well Feb. 5, 2008
7280432 Oscillating shear valve for mud pulse telemetry Oct. 9, 2007
7250873 Downlink pulser for mud pulse telemetry Jul. 31, 2007
7230880 Rotational pulsation system and method for communicating Jun. 12, 2007
6975244 Oscillating shear valve for mud pulse telemetry and associated methods of use Dec. 13, 2005
6970398 Pressure pulse generator for downhole tool Nov. 29, 2005
6850463 Borehole logging apparatus for deep well drilling Feb. 1, 2005
6757218 Semi-passive two way borehole communication apparatus and method Jun. 29, 2004
6714138 Method and apparatus for transmitting information to the surface from a drill string down hole in a well Mar. 30, 2004
6626253 Oscillating shear valve for mud pulse telemetry Sep. 30, 2003
6469637 Adjustable shear valve mud pulser and controls therefor Oct. 22, 2002
6414905 Method and apparatus for communicating coded messages in a wellbore Jul. 2, 2002
6219301 Pressure pulse generator for measurement-while-drilling systems which produces high signal strength and exhibits high resistance to jamming Apr. 17, 2001
6094401 Inverse vertical seismic profiling using a measurement while drilling tool as a seismic source Jul. 25, 2000
5787052 Snap action rotary pulser Jul. 28, 1998
5740126 Turbo siren signal generator for measurement while drilling systems Apr. 14, 1998
5636178 Fluid driven siren pressure pulse generator for MWD and flow measurement systems Jun. 3, 1997
5586083 Turbo siren signal generator for measurement while drilling systems Dec. 17, 1996
5583827 Measurement-while-drilling system and method Dec. 10, 1996
5517464 Integrated modulator and turbine-generator for a measurement while drilling tool May. 14, 1996
5375098 Logging while drilling tools, systems, and methods capable of transmitting data at a plurality of different frequencies Dec. 20, 1994
5357483 Downhole tool Oct. 18, 1994
5249161 Methods and apparatus for preventing jamming of encoder of logging while drilling tool Sep. 28, 1993
5237540 Logging while drilling tools utilizing magnetic positioner assisted phase shifts Aug. 17, 1993
5215152 Rotating pulse valve for downhole fluid telemetry systems Jun. 1, 1993
5197040 Borehole data transmission apparatus Mar. 23, 1993
5189645 Downhole tool Feb. 23, 1993
5182731 Well bore data transmission apparatus Jan. 26, 1993
5119344 Downhole tool Jun. 2, 1992
5073877 Signal pressure pulse generator Dec. 17, 1991
4956823 Signal transmitters Sep. 11, 1990

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