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RE40944 Adjustable shear valve mud pulser and controls therefor  
A telemetry system involving a shear-type mud pulser valve as the preferred embodiment is described. The control system includes a motor driver for the mud pulser which, in essence, moves one...
7564741 Intelligent efficient servo-actuator for a downhole pulser  
An improved energy efficient intelligent pulser driver used for generating a mud pulse in a MWD (measurement while drilling) application. In the pulser driver, a direct current (DC) powered control...
7532540 Fluid erosion protection washer for rotating shaft in MWD tool  
A shaft protection washer to protect a rotating shaft in a “measurement while drilling” (MWD) tool. Use of the shaft protection washer renders the rotating shaft less susceptible to erosion...
7468679 Method and apparatus for mud pulse telemetry  
An apparatus for mud pulse telemetry for transmitting information from a drill string positioned at a down hole location in a bore hole to a surface location, the drill string having a flow passage...
7405998 Method and apparatus for generating fluid pressure pulses  
Apparatuses and methods for generating fluid pressure pulses are disclosed. An example apparatus may include a chamber that can collect fluid and an upstream ported disc coupled to a downstream end...
7400262 Apparatus and methods for self-powered communication and sensor network  
A system for communicating between a first location and a second location comprises a jointed tubular string having a first section and a second section connected at a connection joint, with the...
7327634 Rotary pulser for transmitting information to the surface from a drill string down hole in a well  
A rotary pulser for transmitting information to the surface from down hole in a well by generating pressure pulses encoded to contain information. The pressure pulses travel to the surface where...
7280432 Oscillating shear valve for mud pulse telemetry  
An oscillating shear valve system for generating pressure fluctuations in a flowing drilling fluid comprising a stationary stator and an oscillating rotor, both with axial flow passages. The rotor...
7250873 Downlink pulser for mud pulse telemetry  
A mud pulse telemetry system comprises a surface located fluid supply line having a drilling fluid flowing therein. A non-venting pulser is disposed in the drilling fluid in the supply line, and...
7230880 Rotational pulsation system and method for communicating  
Disclosed herein is a rotational pulsation system including a rotor having turbine blades to drive the rotor. A centralizer having coils and a stator package positioned to operably communicate with...
6970398 Pressure pulse generator for downhole tool  
A pressure pulse generator for a downhole drilling tool is provided. The pressure pulse generator includes a stator with an orifice through which a stream of fluid passes, and a rotor intended to...
6850463 Borehole logging apparatus for deep well drilling  
The invention is directed to a borehole logging apparatus for deep well drilling, with a signal transmitter for transmitting measured data obtained while drilling from a borehole through the...
6757218 Semi-passive two way borehole communication apparatus and method  
The present invention provides a semi-passive two-way borehole communication system and method. The system includes a surface source signal generator for generating an acoustic signal. The acoustic...
6714138 Method and apparatus for transmitting information to the surface from a drill string down hole in a well  
A method and apparatus for transmitting information to the surface from down hole in a well in which a pulser is incorporated into the bottom hole assembly of a drill string that generates pressure...
6469637 Adjustable shear valve mud pulser and controls therefor  
A telemetry system involving a shear-type mud pulser valve as the preferred embodiment is described. The control system includes a motor driver for the mud pulser which, in essence, moves one...
6414905 Method and apparatus for communicating coded messages in a wellbore  
A method and apparatus for communicating coded messages in a wellbore between a transmission node and a reception node is provided. The coded messages are messages are impressed upon a fluid column...
6219301 Pressure pulse generator for measurement-while-drilling systems which produces high signal strength and exhibits high resistance to jamming  
A system is disclosed for generating and transmitting data signals to the surface of the earth while drilling a borehole, the system operating by generating pressure pulses in the drilling fluid...
6094401 Inverse vertical seismic profiling using a measurement while drilling tool as a seismic source  
A reverse VSP system is provided and uses a frequency-controllable modulator of an MWD tool as a downhole seismic source. The modulator has a rotor and stator arranged to provide substantially...
5787052 Snap action rotary pulser  
A pressure pulse generator, or "pulser," and methods for operation are described. The pulser is constructed of a stator and rotor mounted within a housing, each being configured with a central hub...
5740126 Turbo siren signal generator for measurement while drilling systems  
A self-propelled turbo siren modulator assembly is disclosed for use in an MWD system. The turbo siren includes a fixed turbine deflector located upstream from a rotor, which in turn is located...
5636178 Fluid driven siren pressure pulse generator for MWD and flow measurement systems  
A fluid-powered siren of the type used for communicating information between points of a wellbore. In one aspect, responsiveness of the siren's rotor to low flow rates is improved through...
5583827 Measurement-while-drilling system and method  
In a Measurement-While-Drilling system, selecting the fixed frequency in a pulse signal generator utilizes constructive interference to enhance the signal level in an amplitude modulated signal....
5517464 Integrated modulator and turbine-generator for a measurement while drilling tool  
An integrated modulator and turbine-generator includes a turbine impeller which is directly coupled by a drive shaft to a modulator rotor downstream from the impeller. The modulator rotor is...
5375098 Logging while drilling tools, systems, and methods capable of transmitting data at a plurality of different frequencies  
A LWD tool is disclosed comprising, a stator, a rotor which rotates relative to the stator thereby effecting a signal in the borehole fluid flowing therethrough, a brushless DC motor coupled to the...
5357483 Downhole tool  
A downhole tool (100) for generating pressure pulses in a drilling fluid comprising an elongate body (107, 127) and a plurality of blades (116) spaced around the body. The blades are each divided...
5249161 Methods and apparatus for preventing jamming of encoder of logging while drilling tool  
Methods and apparatus for determining whether an encoder of a borehole tool is jammed are disclosed. The borehole tool has a motor with a drive shaft which is coupled to and drives an encoder, a...
5237540 Logging while drilling tools utilizing magnetic positioner assisted phase shifts  
A LWD tool is disclosed comprising, an encoder for generating a signal in the borehole fluid flowing therethrough, a brushless DC motor coupled to the encoder, a position sensor coupled to the...
5215152 Rotating pulse valve for downhole fluid telemetry systems  
A rotating pulse valve for use in a mud pulse telemetry system is presented. In accordance with the invention, a valve is diametrically mounted in a channel of a segment of a drill string wherein...
5197040 Borehole data transmission apparatus  
A borehole data transmission apparatus whereby a centrifugal pump impeller(s) is used to provide a turbine stage having substantial pressure characteristics in response to changing rotational speed...
5182731 Well bore data transmission apparatus  
A hydromechanical signal transmitter for generating pressure pulses in a drilling fluid to transmit telemetry information of a well-logging operation includes a stator fixed in a cylindrical...
5073877 Signal pressure pulse generator  
A mechanical oscillator driven by drilling fluid flow pumped down a drill string bore is combined with sensors and controls to produce a downhole drilling fluid pressure pulse generator for use in...
4956823 Signal transmitters  
A transmitter comprises an impeller assembly rotatable by a liquid flow, and an electrical generator having a stator and a rotor arranged to be driven by the impeller assembly. The impeller...
4914637 Measure while drilling system  
In a fluid communication device such as a measure-while-drilling well-logging tool of the type in which the information concerning the downstream parameters that are measured is transmitted...
4847815 Sinusoidal pressure pulse generator for measurement while drilling tool  
A pressure pulse generator which generates relatively sinusoidal pressure pulses in a fluid flowing in a borehole is disclosed. The pressure pulse generator for a MWD tool broadly comprises: a...
4785300 Pressure pulse generator  
An improved acoustic signal generator has rotor and stator elements, each having a plurality of radially-extending lobes and intervening ports relatively positioned and configured to establish...
4771408 Universal mud pulse telemetry system  
Multistate mud pulsing is achieved by generating both positive and negative pulses within a drill string by means of a plurality of selectively operable bypass passages around a restriction to...
4734892 Method and tool for logging-while-drilling  
A logging-while-drilling tool includes a housing positioned in a drill string, a shaft journaled in the housing, a turbine stage or stages, a rotor or rotors, the latter mounted on the shaft...
4715022 Detection means for mud pulse telemetry system  
Information is conveyed from a downhole location within a wellbore being drilled by producing pressure and velocity of flow variations from the steady state drilling fluid pressure and velocity of...
4675852 Apparatus for signalling within a borehole while drilling  
A down-hole signal generator for a mud-pulse telemetry system comprises an annular impeller surrounding a casing and arranged to be driven by the mud passing along the drill string. The impeller...
4630244 Rotary acting shear valve for drilling fluid telemetry systems  
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...
4499563 Apparatus for transmitting data from a borehole to the surface of the earth during the operation of a drilling device  
An apparatus for the remote transmission of information from a borehole (1) to the surface of the earth is disposed in a drilling pipe string (4) of a drilling device. The drilling device further...
4167000 Measuring-while drilling system and method having encoder with feedback compensation  
A measuring-while-drilling system having a downhole, motor-driven acoustic signal generator includes a motor speed control circuit featuring feedback compensation which accounts for varying loading...
RE30055 Apparatus for transmitting well bore data  
In the representative embodiments of the present invention described herein, a drilling mud is circulated through a drill string at a sufficient rate to effectively operate an impeller-driven...
4040003 Downhole seismic source  
A downhole seismic source for use when drilling a borehole in the earth using a rotating drill string through which a drilling fluid is circulated. In one embodiment, a section of the drill string...
4033429 Downhole seismic source  
Disclosed is a seismic source forming part of a drill string which allows geological prospecting while drilling a borehole. The source includes a section of drill pipe having a spiral cam machined...
3982224 Method and apparatus for transmitting downhole information from a well  
The specification discloses a method and apparatus for transmitting information to the surface from a downhole location in a well. A signal generating means is positioned at the downhole location...
3820063 LOGGING-WHILE-DRILLING ENCODER  
In a logging-while-drilling system motor speed is changed in order to change the phase of an acoustic signal between two phase states. In carrying out a change in phase state, a step voltage is...
3792429 LOGGING-WHILE-DRILLING TOOL  
A logging-while-drilling tool which is adapted to be positioned within the drill string of a well drilling apparatus. The tool has a turbinelike, signal-generating valve which opens and closes at a...
3764970 WELL BORE DATA-TRANSMISSION APPARATUS WITH DEBRIS CLEARING APPARATUS  
In the representative embodiment of the apparatus of the present invention disclosed herein, a first ported or grooved cylindrical member is coaxially disposed within a drill string for directing...
3713089 DATA-SIGNALING APPARATUS FORD WELL DRILLING TOOLS  
In the preferred embodiment of the invention disclosed herein, a well tool having new and improved data-signaling apparatus and carrying a drill bit on its lower end is dependently coupled with a...
Matches 1 - 50 out of 50