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Class Information
Number: 367/85
Name: Communications, electrical: acoustic wave systems and devices > Wellbore telemetering > Through well fluids > Linear valve control
Description: Subject matter wherein the acoustic waves are created by linear movement of structure which modulates the flow of well fluid.

Patents under this class:
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Patent Number Title Of Patent Date Issued
8467268 Pressure release encoding system for communicating downhole information through a wellbore to a surface location Jun. 18, 2013
8433520 Job monitoring methods and apparatus for logging-while-drilling equipment Apr. 30, 2013
8138943 Measurement while drilling pulser with turbine power generation unit Mar. 20, 2012
8060311 Job monitoring methods and apparatus for logging-while-drilling equipment Nov. 15, 2011
7986245 Measurement while drilling mud pulser control valve mechanism Jul. 26, 2011
7881155 Pressure release encoding system for communicating downhole information through a wellbore to a surface location Feb. 1, 2011
7673705 Compartmentalized MWD tool with isolated pressure compensator Mar. 9, 2010
7646310 System for communicating downhole information through a wellbore to a surface location Jan. 12, 2010
RE40944 Adjustable shear valve mud pulser and controls therefor Oct. 27, 2009
7429934 Mud pulse landing assembly for use in directional drilling Sep. 30, 2008
7430153 Downhole tool and method Sep. 30, 2008
7423932 Well bore communication pulser Sep. 9, 2008
7417920 Reciprocating pulser for mud pulse telemetry Aug. 26, 2008
7408837 Measurement while drilling tool and method Aug. 5, 2008
7382686 Drilling signalling system Jun. 3, 2008
7327634 Rotary pulser for transmitting information to the surface from a drill string down hole in a well Feb. 5, 2008
7319638 Hydraulic oscillator for use in a transmitter valve Jan. 15, 2008
7283060 Control apparatus for automated downhole tools Oct. 16, 2007
7250873 Downlink pulser for mud pulse telemetry Jul. 31, 2007
7187298 Methods and systems for transmitting and receiving a discrete multi-tone modulated signal in a fluid Mar. 6, 2007
7180826 Measurement while drilling bi-directional pulser operating in a near laminar annular flow channel Feb. 20, 2007
7139219 Hydraulic impulse generator and frequency sweep mechanism for borehole applications Nov. 21, 2006
7123161 Method and apparatus enhanced acoustic mud pulse telemetry Oct. 17, 2006
7057524 Pressure pulse generator for MWD Jun. 6, 2006
6898150 Hydraulically balanced reciprocating pulser valve for mud pulse telemetry May. 24, 2005
6795373 Permanent downhole resonant source Sep. 21, 2004
6757218 Semi-passive two way borehole communication apparatus and method Jun. 29, 2004
6484817 Signaling system for drilling Nov. 26, 2002
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
6097310 Method and apparatus for mud pulse telemetry in underbalanced drilling systems Aug. 1, 2000
6094401 Inverse vertical seismic profiling using a measurement while drilling tool as a seismic source Jul. 25, 2000
6055213 Subsurface well apparatus Apr. 25, 2000
6016288 Servo-driven mud pulser Jan. 18, 2000
6002643 Pulser Dec. 14, 1999
5740127 Pulse production and control in drill strings Apr. 14, 1998
5660238 Switch actuator and flow restrictor pilot valve assembly for measurement while drilling tools Aug. 26, 1997
5586084 Mud operated pulser Dec. 17, 1996
5583827 Measurement-while-drilling system and method Dec. 10, 1996
5473579 Well bore communication pulser Dec. 5, 1995
5333686 Measuring while drilling system Aug. 2, 1994
5272680 Method of decoding MWD signals using annular pressure signals Dec. 21, 1993
5150333 Method and apparatus for providing improved pressure pulse characteristics for measuring while drilling Sep. 22, 1992
5117398 Well communication pulser May. 26, 1992
5115415 Stepper motor driven negative pressure pulse generator May. 19, 1992
5103430 Mud pulse pressure signal generator Apr. 7, 1992
5079750 Method and apparatus for transmitting information in a borehole employing discrimination Jan. 7, 1992
5040155 Double guided mud pulse valve Aug. 13, 1991
4979577 Flow pulsing apparatus and method for down-hole drilling equipment Dec. 25, 1990

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