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| Number | Title | Issue Date |
| 8061047 | Active positioning of downhole devices using spherical motors Methods and related systems are described for downhole positioning of sensors such as accelerometers, gyroscopes, tiltmeters and geophones. The sensor or sensors are mounted within the spherical rotor of a spherical motor such that the device can be actively positio... | 11/22/2011 |
| 7975392 | Downhole tool Tools and methods for subsurface operations. Circuit arrangements providing a damping effect against undesired vibration effects on inertial data signals derived from inertial sensors disposed in a downhole tool. ... | 07/12/2011 |
| 7475486 | Creep determination technique A method for determining an amount of creep for a tool on a cable and positioned in a well at an oilfield. The method includes moving a winch at a surface of the oilfield to effect movement of the tool below the surface in the well. The winch may then be stopped wit... | 01/13/2009 |
| 7386942 | Method and apparatus for mapping the trajectory in the subsurface of a borehole An apparatus for determining the orientation of a borehole at a point along the borehole, includes a tiltmeter for measuring the inclination of the borehole relative to the vertical, a vector magnetic sensor for measuring the amplitude of the component of the Earth'... | 06/17/2008 |
| 7347003 | Device to measure axial displacement in a borehole A device to measure minute displacement in rocks, including anchor deployment means, anchor registration means, and frame release means. Further including anchor units comprising a fixed anchor point, a reversible anchor actuator and a deployable anchor face capable... | 03/25/2008 |
| 7243719 | Control method for downhole steering tool A method for determining a rate of change of longitudinal direction of a subterranean borehole is provided. The method includes positioning a downhole tool in a borehole, the tool including first and second surveying devices disposed thereon. The method further incl... | 07/17/2007 |
| 7219752 | System and method for damping vibration in a drill string A system for damping vibration in a drill string can include a valve assembly having a supply of a fluid, a first member, and a second member capable of moving in relation to first member in response to vibration of the drill bit. The first and second members define... | 05/22/2007 |
| 7168506 | On-bit, analog multiplexer for transmission of multi-channel drilling information The invention includes, in its various aspects and embodiments, a method and apparatus for multiplexing data on-bit in a drilling operation. The apparatus comprises a bit; a plurality of transducers situated on the bit; and an analog multiplexer situated on the on t... | 01/30/2007 |
| 7162807 | Geomagnetic sensor having a dip angle detection function and dip angle detection method therefor A geomagnetic sensor supporting a dip angle detection function. The geomagnetic sensor includes a rotation angle measurement part for measuring pitch and roll angles of the main body with respect to the surface of the Earth; a geomagnetic measurement module for outp... | 01/16/2007 |
| 7100289 | Microelectronic vehicle service system sensor Compact and robust sensors for utilization with vehicle wheel alignment angle sensor units and vehicle service devices. The sensors incorporate one or more micro-electromechanical devices configured to measure movement and/or orientation of the sensor about one or m... | 09/05/2006 |
| 7080460 | Determining a borehole azimuth from tool face measurements A method for surveying a subterranean borehole is provided. The method includes determining tool face angles at first and second longitudinal positions in the borehole. The method further includes processing the tool face angles to determine a change in borehole azi... | 07/25/2006 |
| 7028409 | Method for computation of differential azimuth from spaced-apart gravity component measurements A method is provided for computing the differential azimuth between two sets of spaced-apart gravity component measurement devices in a borehole, employing multiple rotation angles. The method includes modeling relationships of axes as defined; forming equations rel... | 04/18/2006 |
| 6975112 | Systems and methods of determining motion tool parameters in borehole logging A system and method for calculating the lateral velocity of a rotating drilling tool within a borehole, the system comprising: a pair of accelerometers placed oppositely across the drilling tool axis of rotation and two magnetometers. The method comprises: reading t... | 12/13/2005 |
| 6860029 | Length adjustable tool for aligning boring bar An alignment tool for adjustably positioning a boring bar relative to a spaced apart fixed location on a structural member including an elongated bar formed of a plurality of axially aligned and separable tubular members and having its opposite ends mounted to the b... | 03/01/2005 |
| 6704436 | Method of obtaining a developed two-dimensional image of the wall of a borehole The invention relates to a method of obtaining a developed two-dimensional image of the wall of a borehole. The method comprises the steps consisting in: measuring a primary physical magnitude in said borehole as a function both of depth and of azimut... | 03/09/2004 |
| 6487782 | Method and apparatus for use in creating a magnetic declination profile for a borehole A method and apparatus for use in creating a magnetic declination profile for a borehole. The method includes the steps of making a magnetic directional measurement at a longitudinal location in the borehole and at a magnetic measurement orientation, maki... | 12/03/2002 |
| 6339886 | Remotely measured caliper for wellbore fluid sample taking instrument An apparatus for measuring the internal diameter of a wellbore for a wireline formation sample taking instrument, including an hydraulically actuated probe and back up shoe for selective engagement with the wall of a wellbore, an hydraulic pump and select... | 01/22/2002 |
| 6065219 | Method and apparatus for determining the shape of an earth borehole and the motion of a tool within the borehole A method and apparatus are provided for estimating the cross-sectional shape and orientation of an earth borehole and the motion of a tool therein. The method and apparatus involve measuring the distance from the tool to the borehole wall at a plurality o... | 05/23/2000 |
| 6065218 | Method and apparatus for logging non-circular boreholes The invention relates to a logging method and apparatus adapted for use in non-circular boreholes which, in one embodiment, comprises the use of a first and a second sonde, each sonde having: a pad adapted for contact with the borehole wall, at least a se... | 05/23/2000 |
| 6026582 | Methods and apparatus for mapping pipe and valve bores in a nuclear reactor Methods and apparatus for mapping pipe and valve bores in a reactor pressure vessel (RPV) of a nuclear reactor are described. In one embodiment of the apparatus, a main bar and an adjustable chuck facilitate positioning of a digital indicator inside a val... | 02/22/2000 |
| 6021577 | Borehole surveying A borehole survey is conducted at a drilling site S by a so-called Interpolated In-Field Referencing (IIFR) method in which: (a) absolute local geomagnetic field data is obtained by spot measurement of the earth's magnetic field at a local measurement sit... | 02/08/2000 |
| 5903147 | Eddy current array inspection device for shaped holes An eddy current device for inspecting a component, such as a closed surface area of a gas turbine engine or the like, includes an eddy current array circuit having an active face for positioning on a surface portion of the component during an inspection o... | 05/11/1999 |
| 5806195 | Rate gyro wells survey system including nulling system A method for well borehole survey is set out. A sonde supports X and Y accelerometers and X and & sensors on a rate gyro having a Z axis aligned with the sonde. On a slickline, or within a drill string, the sonde is used to measure four variables, these b... | 09/15/1998 |
| 5657547 | Rate gyro wells survey system including nulling system A method for well borehole survey is set out. A sonde supports X and Y accelerometers and X and & sensors on a rate gyro having a Z axis aligned with the sonde. On a slickline, or within a drill string, the sonde is used to measure four variables, these b... | 08/19/1997 |
| 5640780 | Moving device for intervening inside small-diameter pipework The present invention relates to a moving device for intervening inside small-diameter pipework. The technical field of the invention lies in constructing measurement apparatus for monitoring pipework and capable of moving along the inside of the pipework... | 06/24/1997 |
| 5564193 | Method of correcting for axial and transverse error components in magnetometer readings during wellbore survey operations A method is disclosed for determining wellbore azimuth accurately, notwithstanding the corrupting influence of axial and transverse magnetic field biasing error components. A reliable value of the axial magnetic field component (Bx) is determin... | 10/15/1996 |
| 5548900 | Measuring instruments In a downhole measuring caliper for oil well casings, comprising a circumferential array of radially extensible sensing fingers (30) between upper and lower sets of centralizing arms, the fingers are actuated through integral pre-stressed spring arms (34)... | 08/27/1996 |
| 5543972 | Mirror for producing a development picture of the wall of a borehole in the ground and device therefor A compound type cone mirror installed inside a sonde moving up and down in a borehole for observing the whole circumference of the hole wall at an arbitrary depth at a time, a combined mirror for locally observing the hole wall in detail, and an elevating... | 08/06/1996 |
| 5469736 | Apparatus and method for measuring a borehole An apparatus and a method are provided for measuring the caliper of a borehole, and the standoff of a drilling tool from the walls of a borehole during a drilling operation. The apparatus includes three or more sensors, such as acoustic transducers arrang... | 11/28/1995 |
| 5442284 | Process for inspecting spacers of heat exchanger tubes in a heat exchanger In a method of inspecting heat exchanger tubes of a heat exchanger in which the heat exchanger tubes are fixed in position by spacers and serve to transfer heat from a first medium to a second medium that is fluid-tightly separated from the first medium, ... | 08/15/1995 |
| 5398421 | Method for connecting magnetic measurements performed in a well through a measuring device in order to determine the azimuth thereof A measuring tool including a device (4) for measuring the terrestrial magnetic field is inserted in a drill string (2) linking a drilling tool (3) to a surface installation. The method allows to be free from the disturbance affecting the measured terrestr... | 03/21/1995 |
| 5329691 | Hole probe apparatus In an automatic fastening machine 10 comprising a frame 12 for operating a workpiece 16 along a work centerline and having a drilling tool for drilling a hole in the workpiece, a bucking ram 26, and a milling tool 30 having a hole inspection assembly 22 m... | 07/19/1994 |
| 5155916 | Error reduction in compensation of drill string interference for magnetic survey tools A method for determining the orientation of the axis of a borehole with respect to an earth-fixed reference coordinate system at a location in the borehole comprising the steps of: measuring two cross-borehole components or two-cross-borehole components a... | 10/20/1992 |
| 5128867 | Method and apparatus for determining inclination angle of a borehole while drilling A method and apparatus is presented for determining the inclination angle of a borehole being drilled, the data for determining the inclination angle being obtained while the drillstring is rotating.... | 07/07/1992 |
| 5012412 | Method and apparatus for measurement of azimuth of a borehole while drilling A method and apparatus is presented for measuring the azimuth angle of a borehole being drilled, the data for determining the azimuth angle being obtained while the drillstring is rotating.... | 04/30/1991 |
| 4992735 | System and method for inspecting metallic plugs in heat exchanger tubes using a radially extendible probe An apparatus and a method for remotely inspecting the interior walls of a cavity having a circular cross section that varies in diameter, such as the interior of a hollow tube plug. The apparatus has an eddy current probe head having a distal and proximal... | 02/12/1991 |
| 4935883 | Apparatus and method for leveling a gravity measurement device Apparatus and method for establishing a level plane and with respect to the level plane, vertically aligning an acceleration sensitive axis of a gravity measurement device (10). The gravity measurement device includes an accelerometer (68), which is rotat... | 06/19/1990 |
| 4930223 | Bend detector pig A pipeline bend detector pig for measuring the changes in direction of a pipeline having a first pig body assembly with an imaginary longitudinal axis and spaced apart resilient cups for supporting the pig body assembly in a pipeline so that the axis ther... | 06/05/1990 |
| 4852262 | Gauge for in situ measurement of borehole diameter A gauge for measuring in situ the diameter of a borehole in salt or other ft creeping rock types is provided so that changes in borehole structure can be detected. The gauge comprises a cylindrical body insertable lengthwise into a borehole and having an ... | 08/01/1989 |
| 4851773 | Rotating head profilometer probe An electro-mechanical eddy current probe having a rotatable sensing head for sensing the wall thickness of and locating local defects in a tube or conduit through which it is passed. The rotatable head includes a radially movable, outward projecting sensi... | 07/25/1989 |
