Inclination And Direction Indications Patents (Class 33/313)
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Patent number: 4649349Abstract: Each end of the rods surrounding the positioning sensor is provided with a coil, through which passes a current, whose intensity is automatically regulated as a function of the sensor readings in order to make the gradient of the magnetic field due to the rods and to the field itself zero within the sensor area.Type: GrantFiled: March 1, 1984Date of Patent: March 10, 1987Assignee: Commissariat a l'Energie AtomiqueInventors: Guy Chiron, Jean-Charles Vidal
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Patent number: 4622750Abstract: A universal measuring gauge for geological structures is disclosed, having an application part including an arm and a gib, which is normally attached to it on one side, the arm being, on the other side, shaped into a universal bearing journal (pin), which passes through the bearing bush; two opposite axes equipped, on their ends, with normally fixed inclination indicators, radiate from the bush center; a suspension part including two vertical discs with a protractor scale, pivoted on the mentioned axes and firmly connected with the suspension, the lower suspension part being equipped with a transparent horizontal protractor scale and in the center of the lower suspension part, the upper half-bush of the bearing is formed, the bearing being passed by a hollow pin, carrying the transparent horizontal disc with indices, the hollow pin being axially and radially guided (glided) in the upper and lower half-bushes of the bearing; and an orientation part containing the mentioned lower half-bush, where the lower needType: GrantFiled: November 4, 1985Date of Patent: November 18, 1986Assignee: Ceskoslovenska akademie vedInventors: Josef Dudek, Stanisvlav Adamek
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Patent number: 4614041Abstract: A magnetic angular position sensor having a ferrofluid filled spherical chamber in a cylindrical housing, within which floats a body comprising a buoyant core carrying a magnet which aligns itself and the body with the earth's magnetic field, and carrying an odd number of small permanent magnets. Hall effect devices are located in recesses in the ends of the housing. The housing also carries a calibration solenoid.Type: GrantFiled: April 25, 1985Date of Patent: September 30, 1986Assignee: Standard Telephones and Cables Public Limited CompanyInventors: Kenneth S. Darton, Johnathan P. Larsen
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Patent number: 4578871Abstract: The inclinometer comprises a single module for measuring the inclination and azimuth of a bore, such as that of an oil well. The single module contains a removable cassette with an inclination measurement means disposed on one side thereof and an azimuth measurement means on the opposite side so as to provide a measurement recording on the substrate of the recording means. An optical assembly is provided within said module for the inclination and azimuth measurement means. Further, a power source is disposed within said module. The module has an inner and outer housing means being provided within said inner housing for providing a rotational movement thereto.In accordance with another embodiment, the inclinometer comprises a first module being a power module for supplying power to the components of the second module.Type: GrantFiled: November 5, 1984Date of Patent: April 1, 1986Assignee: Oil & Natural Gas CommissionInventor: B. P. Kathel
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Patent number: 4570353Abstract: An apparatus and method for preventing damage to the mechanical components of a borehole inclinometer is disclosed. The inclinometer uses a freely suspended pendulum to align with the vertical at a selected position in the borehole. A compass connected to the pendulum rotates to an orientation defined by the earth's magnetic field. To protect the components which suspend the pendulum, the pendulum is clamped between a timer and a lens as the inclinometer is lowered into the borehole. At a selected time, the pendulum is unclamped and is permitted to reach an equilibrium, measuring position. After a selected interval, the timer urges the pendulum against the lens to clamp the pendulum. The inclinometer is raised from the wellbore, and the orientation of the pendulum relative to the lens is observed to determine the azimuth and inclination of the borehole.Type: GrantFiled: December 31, 1984Date of Patent: February 18, 1986Assignee: Exxon Production Research Co.Inventors: John L. Evans, Larry R. Russell
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Patent number: 4524526Abstract: Apparatus and a method for detecting deflections along the length of a pipeline. A plurality of measurements of inertial attitude are made along the length of the pipeline over time by means of apparatus, including sensors, associated with a pipeline pig. Thereafter, by comparing a time sequence of such measurements, points of flexure are accurately located and identified.Type: GrantFiled: November 22, 1982Date of Patent: June 25, 1985Assignee: Litton Systems, Inc.Inventor: Seymour Levine
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Patent number: 4510696Abstract: When surveying a borehole using an instrument responsive to the earth's magnetic field, a length of non-magnetic drill collar is necessary to house means for measuring the magnetic field in the borehole perpendicular to the direction of the borehole axis. The instrument determines the inclination angle and the highside angle from the gravitation measurements, with these measurements and the magnetic measurements, the azimuth angle is determined. Using the method of this invention a minimum length of non-magnetic material necessary for an accurate measurement may be calculated and used.Type: GrantFiled: July 20, 1983Date of Patent: April 16, 1985Assignee: NL Industries, Inc.Inventor: Richard F. Roesler
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Patent number: 4505048Abstract: A borehole survey instrument is provided which includes a meniscus type floating compass member for indicating azimuth and inclination. A light source is disposed below the indicia for illuminating the indicia upwardly through the liquid in which the compass member floats and a novel lens system is provided for focusing the image of the illuminated compass member upon a film disposed below the compass member and for transmitting illumination to the compass member. The compass member is mounted on a centering post which is of minimum diameter consistent with the required rigidity and which permits high angle compass members to be utilized to indicate angles approaching ninety degrees. In a preferred embodiment of the present invention, the lens system has a refractive index closely matching that of the liquid surrounding the floating compass member to minimize reflection or refraction at the inner face therebetween.Type: GrantFiled: December 3, 1982Date of Patent: March 19, 1985Assignee: Wilson Industries, Inc.Inventor: Harper E. Sharp
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Patent number: 4493155Abstract: A sensor (16) is affixed to a piece of rotatable equipment (10). The sensor has a rolling member (26) freely moveable within a cage member (18). In operation, the rolling member (26) contacts electrically conductive surfaces (28,30) disposed about the interior of the cage member. By determining which particular pair of surfaces are currently in contact with the rolling member, the orientation of the cage member with respect to the horizontal is known. The preferred embodiment utilizes a resistor network (34) and an electrical measuring device (48) for making this determination.Type: GrantFiled: September 29, 1982Date of Patent: January 15, 1985Assignee: Combustion Engineering, Inc.Inventors: Joseph H. Comeau, Joseph E. Kowles, John P. Lareau, Kenneth R. Mayo, Herbert A. Runde
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Patent number: 4485563Abstract: A borehole survey instrument is provided having a meniscus type floating compass member with indicia thereon for indicating azimuth and inclination. A light source is disposed below the indicia for illuminating the indicia upward through the liquid through which the meniscus type floating compass member floats. A lens system is provided for focusing the image of the illuminated compass member upon a film disposed below the compass member. This arrangement permits the centering post for the compass member to be of minimum diameter consistent with rigidity requirements and permits a high angle compass member to indicate angles of inclination approaching ninety degrees. A multiple light bulb light source is utilized and each light bulb is mounted in a manner which permits a single light bulb to illuminate the entire compass member.Type: GrantFiled: December 3, 1982Date of Patent: December 4, 1984Assignee: Wilson Industries, Inc.Inventors: Harper E. Sharp, John W. Linn, III, Emil S. Macha, Miles A. Smither
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Patent number: 4480391Abstract: A borehole survey instrument and control circuitry are described. The borehole survey instrument includes indicators for measuring angle of deviation from the vertical and angle of deviation from magnetic north and a photographic recording means for recording the output of the indicators at selected times. A lighting system is utilized in conjunction with the photographic recording means to expose photographic film and a novel time control circuit is utilized in conjunction with the lighting system to alter the length of time of illumination in accordance with the operativeness of individual bulbs within the lighting system. In this manner, the failure of one or more bulbs within the lighting system will not substantially affect the amount of illumination to which the film in the photographic recording means is exposed.Type: GrantFiled: December 3, 1982Date of Patent: November 6, 1984Assignee: Wilson Industries, Inc.Inventors: Harper E. Sharp, Miles A. Smither
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Patent number: 4461088Abstract: A borehole mapping and/or navigational instrument includes a carrier movable lengthwise in the borehole; structure on the carrier defining an axis of rotation; and a tilt sensitive device rotatable about the axis of rotation, that device having a tilt sensitive axis with components along the axis of rotation and along perpendiculars to that axis. One or more angular rate sensors may be provided to be rotatable about the axis of rotation.Type: GrantFiled: April 30, 1981Date of Patent: July 24, 1984Assignee: Applied Technologies AssociatesInventor: Brett H. Van Steenwyk
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Patent number: 4454756Abstract: A system and method for surveying, with accuracies better than one foot per thousand feet of depth, very deep boreholes having the attendant small diameters, high temperatures and high pressures with very high accuracy. A downhole probe is used having a small diameter, less than about four inches. Three linear type accelerometers and at least two gyros to provide three sensitive axes are fixedly mounted at points spaced along the axis of an elongated, rigid, thermally conductive support member to form an instrument cluster. Signals from these instruments are then processed and transmitted serially over a conductor of a conventional wireline to the surface unit where a surface computer continuously computes and records the current position of the instrument.Type: GrantFiled: November 18, 1982Date of Patent: June 19, 1984Assignee: Wilson Industries, Inc.Inventors: Harper E. Sharp, Leo Spiegel, Richard M. Masters, Elmer J. Frey, John R. Howatt, Gary E. Walker
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Patent number: 4452075Abstract: The present invention relates to a program controlled apparatus for providing rapid calibration and update of sensor parameters in a push drill guidance apparatus which is remotely controllable from microprocessor circuitry. A special calibration program is set into non-volatile memory for coaction with the control processor to compute sensor parameters for storage and recall during normal programmed guidance operation.Type: GrantFiled: September 24, 1982Date of Patent: June 5, 1984Assignee: Conoco Inc.Inventors: Rhea W. Bockhorst, Jimmie H. Elenburg
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Patent number: 4428123Abstract: An improved mounting between a cylindrical package, containing a sensitive instrument, and a protective cylindrical housing disposed thereabout. Plugs at opposite ends of the housing each have a conical recess opening toward the other plug and between which the package is confined. O-rings at each end of the package engage the tapered wall of the adjacent recess and absorb longitudinal and radial shock and center the package within the housing. To restrain relative rotational movement between the housing and instrument package, a plurality of coil springs are disposed within aligned bores in an end of the package and the adjacent plug.Type: GrantFiled: January 28, 1982Date of Patent: January 31, 1984Assignee: Sundstrand Data Control, Inc.Inventors: Rand H. Hulsing, II, John A. Morrow
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Patent number: 4399692Abstract: To provide for accurate determination of azimuth in a borehole survey apparatus, a downhole probe is provided with two or more sections connected by torsionally rigid, flexible joint assemblies with provisions for generating signals that represent the relative inclination and azimuth of one probe section from another. These signals are combined with inclination signals obtained from a set of accelerometers in one of the probe sections in a signal processing unit to generate signals that represent the direction and depth of the borehole.Type: GrantFiled: January 13, 1981Date of Patent: August 23, 1983Assignee: Sundstrand Data Control GroupInventors: Rand H. Hulsing, II, Rex B. Peters
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Patent number: 4389792Abstract: A drill core inclinometer is releasably mountable in a core barrel and includes a device for measuring the vertical and transverse inclination of the drill core before the core is detached from the matrix. The device, once it has effected the measurements, is arrested so that the measurements are retained and remain unaffected while the core is brought to the surface.Type: GrantFiled: January 15, 1981Date of Patent: June 28, 1983Assignee: Ruhrkohle A GInventor: Heinz Fuchs
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Patent number: 4385449Abstract: An improved inclinometer and method for simultaneously measuring tilt and relative bearing in remote hostile environments such as oil and gas wells involving a pair of pendulum masses attached to perpendicularly intersecting shafts and individually capable of creating rotational motion through angles characteristic of tilt and relative bearing wherein, by use of a differential gearing system, the rotational motion induced by tilt and rotational motion induced by relative bearing are summed as a single rotational motion parallel to the axis of rotation of the relative bearing induced rotation and collinear to the well bore such that potentiometers responsive to relative bearing and the sum of tilt and relative bearing generate electrical signals that can both be transmitted to the surface without the use of troublesome slipring electrical contacts or the like. In this manner the reliability and durability of instrument is improved.Type: GrantFiled: April 6, 1981Date of Patent: May 31, 1983Assignee: Gearhart Industries, Inc.Inventor: Alvin B. Miller
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Patent number: 4361192Abstract: A borehole survey method and apparatus for use in drilling substantially horizontal boreholes through a mineral deposit wherein a dip accelerometer, a roll accelerometer assembly and a fluxgate are disposed near the drill bit, which is mounted on a bent sub, and connected to a surface computation and display unit by a cable which extends through the drill string. The dip angle of the borehole near the drill bit, the azimuth of the borehole near the drill bit and the roll angle or orientation of the bent sub are measured and selectively displayed at the surface while the drill string is in the borehole for utilization in guiding the drill bit through the mineral deposit along a predetermined path.Type: GrantFiled: February 8, 1980Date of Patent: November 30, 1982Assignee: Kerr-McGee CorporationInventor: Larry S. Trowsdale
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Patent number: 4345454Abstract: A well instrument which includes a probe adapted to be lowered into a well to sense the inclination of the well and the direction of that inclination, for use in steering a drill bit or surveying the well, is provided with mechanism for rotating the probe relative to a body of the tool about an axis extending longitudinally of the well in order to give an indication of and allow compensation for minor inaccuracies or offsets in the readouts produced by the sensing mechanism. The probe is desirably rotated alternately in opposite directions.Type: GrantFiled: November 19, 1980Date of Patent: August 24, 1982Assignee: AMF IncorporatedInventor: Robert L. Brown
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Patent number: 4344235Abstract: The circuitry and structure of a levitated ball inclinometer are disclosed. A ferromagnetic ball is centerized between pairs of electromagnets by electromagnetic forces of magnitudes sufficient to offset the gravitational forces imposed on the ball. The electric currents required are therefore proportional to the forces and can be used as measurements to determine inclination.Type: GrantFiled: December 29, 1980Date of Patent: August 17, 1982Assignee: General Electric Co.Inventor: Thomas E. Flanders
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Patent number: 4335520Abstract: A stiff, straight spar is allowed to pivot about an anchor on the seafloor. he location of the bottom with respect to the top is then determined by measuring the tilt of the spar and computing the offset of the bottom relative to the top. The straight member uses its internal buoyancy to remain erect and stable while the weight of the anchor keeps it in place on the seafloor. The top of the spar is tracked by shore stations while the tilt and heading of the spar is monitored by an instrumentation system. Simultaneous readings of the shore instruments and the spar's tilt and heading indicators allow direct determination of the anchor location relative to the shore. An air ballast control enables the apparatus to be easily maneuvered on the ocean bottom by divers or on the surface and an internal plumb bob system allows calibration of the overall system.Type: GrantFiled: September 22, 1980Date of Patent: June 22, 1982Assignee: The United States of America as represented by the Secretary of the NavyInventor: Jeffrey V. Wilson
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Patent number: 4297790Abstract: Survey apparatus and method employs a free gyroscope for fast determination of azimuth, free gyroscope alignment being periodically corrected by a rate gyroscope which is periodically rotated for accurate azimuth determination. An accelerometer is also usable in conjunction with the gyroscopes for tilt determination. More generally, method and means is provided for calibrating (initially or periodically) an angle or position reference device.Type: GrantFiled: June 25, 1979Date of Patent: November 3, 1981Assignee: Applied Technologies AssociatesInventors: Donald H. Van Steenwyk, John R. Cash, Paul W. Ott
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Patent number: 4291978Abstract: A rotating target contains an appropriately shaped section of photoelectric material which detects the position of a beam of light which is incident on the target. The position of the beam is determined in terms of its distance from the center of rotation of the target and by its angular position relative to the vertical. The vertical direction is simultaneously determined relative to the rotating target using a gravity operated reference.Type: GrantFiled: December 5, 1979Date of Patent: September 29, 1981Assignee: Scintrex LimitedInventor: Harold O. Seigel
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Patent number: 4265028Abstract: A borehole mapping and navigational instrument which travels up and down in a well. The instrument includes a housing which supports at least a rate gyroscope, accelerometer, and an electric motor to rotate the accelerometer about an axis which is canted about the axis of the housing. Since the accelerometer is rotated, its tilt sensitive axis then effectively has components along the X and Y directions normal to the Z axis, whereby components along all three axis are provided.Type: GrantFiled: May 7, 1979Date of Patent: May 5, 1981Assignee: Applied Technologies AssociatesInventor: Brett H. Van Steenwyk
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Patent number: 4255975Abstract: A device for measuring movements or deformations has at least one pair of variable reactance movement pick-ups, each pick-up comprising transducer elements whereby a modified inductive or capacitive reactance signal is generated by each pick-up in response to the movements or deformations. The variations of the reactances of the two pick-ups are arranged to be equal but opposite. An electrical oscillator is connected alternately to the two pick-ups by automatic switching elements, and each pick-up alters the oscillation frequency in dependence upon the variation of its reactance. The required measurement is derived from the difference between the two altered frequencies.Type: GrantFiled: May 11, 1979Date of Patent: March 17, 1981Assignee: Coyne et Bellier, Bureau 'Ingenieurs ConseilsInventor: Pierre-Jean Debreuille
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Patent number: 4245498Abstract: A surveying instrument sensor which includes a gimbal supported for rotation within a casing, a torquer coupled to rotate the gimbal with a first two-axis flexure suspended gyro supported on the gimbal with its spin axis perpendicular to the axis of the gimbal and one of its sensitive axes aligned with the axis of the gimbal, a second two-axis flexure suspended gyro disposed on the gimbal with its spin axis alinged with the axis of the gimbal and having two sensitive axes outputs orthogonal thereto. The output of the first gyro is coupled to the torquer to form a gimbal stabilized loop and the outputs and torquing inputs of the second gimbal coupled into rate capture loops with output signals obtained from the rate captured loops permitting fast and accurate surveying of a well pipe.Type: GrantFiled: December 6, 1978Date of Patent: January 20, 1981Assignee: The Singer CompanyInventor: Raymond S. Poquette, Jr.
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Patent number: 4231252Abstract: This invention relates to a device for providing data for determining a non-horizontal change from one direction to another of a reference axis fixedly associated with a body.The apparatus uses gravity sensor devices, such as accelerometers, to provide data for determining change in both azimuth and slant angle. In some embodiments that data may be derived from the signal of a single accelerometer.Some embodiments of the invention are probes for surveying in geological boreholes. In some of such embodiments a single gravity sensor is fixed to a mass which is mounted for free rotation.Drive elements are provided whereby the mass may be rotated and then allowed to rotate undriven.Thus the direction in which the sensor is responsive to the gravity vector is, due to inertia of the mass, independent from random axial rotation of the probe.Type: GrantFiled: November 20, 1978Date of Patent: November 4, 1980Assignee: Mount Isa Mines LimitedInventor: Leonard A. Cherkson
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Patent number: 4227405Abstract: A digital mineral logging system acquires data from a mineral logging tool passing through a borehole and transmits the data uphole to an electronic digital signal processor. A predetermined combination of sensors, including a deviometer, is located in a logging tool for the acquistion of the desired data as the logging tool is raised from the borehole. Sensor data in analog format is converted in the logging tool to a digital format and periodically batch transmitted to the surface at a predetermined sampling rate. An identification code is provided for each mineral logging tool, and the code is transmitted to the surface along with the sensor data. The self-identifying tool code is transmitted to the digital signal processor to identify the code against a stored list of the range of numbers assigned to that type of tool. The data is transmitted up the d-c power lines of the tool by a frequency shift key transmission technique.Type: GrantFiled: April 6, 1979Date of Patent: October 14, 1980Assignee: Century Geophysical CorporationInventor: Jerry B. West
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Patent number: 4199869Abstract: Mapping apparatus comprises:(a) a gyroscope and a carrier frame therefor,(b) the gyroscope characterized as having a spinning rotor and torsion structure defining a gimbal, and wherein the rotor spin frequency has a predetermined relation to a resonant frequency of said structure,(c) the gyroscope further characterized as having two input axes, and an output axis about which the spin rotor rotates,(d) drive means operatively connected with said frame to rotate the frame about one of said axis, and(e) the gyroscope having means to detect rotor pivoting about one of said two input axes in response to said rotation of the frame.A second gyroscope may be employed, with its frame. rotated by the same drive means; and the output axes of the two gyroscopes are typically orthogonally related.Type: GrantFiled: December 18, 1978Date of Patent: April 29, 1980Assignee: Applied Technologies AssociatesInventor: Donald H. Van Steenwyk
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Patent number: 4192077Abstract: Survey apparatus and method employs a free gyroscope for fast determination of azimuth, free gyroscope alignment being periodically corrected by a rate gyroscope which is periodically rotated for accurate azimuth determination. An accelerometer is also usable in conjunction with the gyroscopes for tilt determination.Type: GrantFiled: July 17, 1978Date of Patent: March 11, 1980Assignee: Applied Technologies AssociatesInventors: Donald H. Van Steenwyk, John R. Cash, Paul W. Ott
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Patent number: 4163324Abstract: When surveying a borehole using an instrument responsive to the earth's magnetic field, the assumption is made that the error vector which comprises the difference between the true earth's magnetic field and the measured magnetic field in the borehole is in the direction of the borehole axis. The magnitude of this error vector is determined and used to correct the magnetically measured azimuth.Type: GrantFiled: February 23, 1978Date of Patent: August 7, 1979Inventors: Michael K. Russell, Anthony W. Russell
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Patent number: 4157619Abstract: An inclination responsive device including a coil energized to produce a magnetic field extending along a normally vertical axis of the device, and a flux gate assembly adapted to respond to a horizontal component of that field upon tilting movement of the axis to an inclined non-vertical position, and to thereby produce an output which varies in response to changes in inclination. The flux gate assembly is desirably also responsive to the earth's magnetic field or another ambient field to also produce an output representing directional orientation of the device with respect to the ambient field.Type: GrantFiled: October 14, 1977Date of Patent: June 12, 1979Assignee: Scientific Drilling ControlsInventor: Bernard R. Zuvela
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Patent number: 4130942Abstract: Apparatus for borehole surveying employing remote reading electro-optical sensors for providing digital signals represenatative of azimuth and multi-axis inclination for direct transmission to the surface for recording or use.Type: GrantFiled: May 26, 1977Date of Patent: December 26, 1978Assignee: The Laitram CorporationInventor: James M. Lapeyre
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Patent number: 4117602Abstract: A magnetic compass in which the compass magnet is an electromagnet energized only when in a horizontal disposition to provide a correct heading indication without error due to tilting of the compass magnet.Type: GrantFiled: April 4, 1977Date of Patent: October 3, 1978Assignee: The Laitram CorporationInventor: James M. Lapeyre
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Patent number: 4083117Abstract: Inclination and high side angle of a borehole is measured by a tool that may be positioned inside a drill string and lowered into the borehole. The tool includes three gravity transducers positioned in a novel array. The transducers are positioned in a case whose axis coincides with that of the borehole and are arranged with their axes angularly displaced from each other around the case axis by approximately 120 degrees and from the case axis by approximately 45 degrees. An array of fluxgate magnetic transducers may be added to the apparatus to provide combination surveying and steering capability.Type: GrantFiled: September 24, 1976Date of Patent: April 11, 1978Assignee: Sperry-Sun, Inc.Inventors: Anthony William Russell, Michael King Russell
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Patent number: 4071959Abstract: An instrument for measuring the direction of a borehole in order to carry out a spatial survey thereof comprises a gyro-stabilized single-axis platform having its axis coincident with the axis of the borehole and three gravity sensors for measuring three components of gravity in the direction of the borehole axis and in two mutually perpendicular directions in a plane perpendicular to said axis.Type: GrantFiled: March 23, 1976Date of Patent: February 7, 1978Inventors: Michael K. Russell, Anthony W. Russell
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Patent number: 4040189Abstract: The apparatus includes a housing in which a frame is rotationally mounted, an instrument which is pivotally mounted about two axes within said frame, level sensing devices on the instrument to detect the tilt of the instrument about said two axes, and means for tilting the instrument within the frame so that the instrument's reference axis may be brought to a substantially vertical position when the apparatus is within an inclined well bore. The instrument is mounted unsymmetrically within the frame so that the instrument may be tilted in one direction on one axis a much greater amount than on the other axis and in the other direction.Type: GrantFiled: September 22, 1976Date of Patent: August 9, 1977Assignee: La Coste and Romberg, Inc.Inventor: Lucien J. B. LaCoste
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Patent number: 4021774Abstract: A borehole sensor is presented including a three axis gimbal device for determining (1) a vertical plane, using the force of gravity as a reference, (2) a horizontal plane, using the force of gravity as a reference, and (3) the north direction, using the earth's magnetic field as a reference. A motor drive system drives parts of the mechanism to desired positions about the three axes, and error transducers determine the deviation from desired positions about the axes and provide feedback to the motor drive system to eliminate the error.Type: GrantFiled: June 23, 1976Date of Patent: May 3, 1977Assignee: Teleco Inc.Inventors: Einar Asmundsson, Donald S. Grosso
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Patent number: 3964171Abstract: The present invention relates to a device for use in steplessly detecting the presence and the precise position of ovalizations, squashings or swellings into a submerged pipeline as well as the projections on a vertical plane and on a horizontal plane respectively of the curved geometrical configuration of said pipeline.Type: GrantFiled: June 3, 1974Date of Patent: June 22, 1976Assignee: Snam Progetti S.p.A.Inventors: Arnaldo Gambini, Demetrio Terenziani