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| Number | Title | Issue Date |
| 7730625 | Gyroscopically-oriented survey tool A gyroscopically-oriented survey tool, includes a housing having an axis. Three accelerometers are mounted in the housing with their axis set orthogonally. A first of the axis is aligned to the axis of the housing. A second of the axis is perpendicular to the first.... | 06/08/2010 |
| 7414405 | Measurement tool for obtaining tool face on a rotating drill collar An apparatus for obtaining tool face angles on a rotating drill collar in substantially real time is disclosed. In one exemplary embodiment the apparatus includes a magnetoresistive magnetic field sensor deployed in a tool body. The apparatus further includes a prog... | 08/19/2008 |
| 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 |
| 7363717 | System and method for using rotation sensors within a borehole A system and method for using a survey tool within a borehole is provided. The survey tool includes a plurality of rotation sensors each having a sensing axis and a direction of least acceleration sensitivity. The sensing axes of the plurality of rotation sensors ar... | 04/29/2008 |
| 7353613 | Directional sensor system comprising a single axis sensor element positioned at multiple controlled orientations A directional sensor system that incorporates a single axis sensor element that is manipulated to a plurality of orientations. The resulting responses of the sensor element at these locations are combined to obtain a measure of orientation of the system. The system ... | 04/08/2008 |
| 7350594 | System and method for tracking and communicating with a boring tool A system for determining the location of and communicating with a downhole tool assembly. A tracker assembly comprises a vertical transmitting antenna, a plurality of receiving antennas, and a processor. The downhole tool assembly has a beacon assembly comprising a ... | 04/01/2008 |
| 7350410 | System and method for measurements of depth and velocity of instrumentation within a wellbore A survey tool for use in a wellbore includes a downhole portion having an axis. The downhole portion is adapted to move within the wellbore with the axis generally parallel to the wellbore. The survey tool further includes a first acceleration sensor mounted at a fi... | 04/01/2008 |
| 7325322 | Electric park brake inclinometer A tilt sensor system (10) is provided comprising a housing (12), a magnetized region (13) within the housing (12), and a magnetized, articulated pendulum (14) magnetically coupled to the magnetized region (13) for suspending... | 02/05/2008 |
| 7274989 | Borehole equipment position detection system It is important to know the precise position of equipment when testing of the BOP, testing the wellhead, flow testing the well, kick control, well circulation and testing of spool trees between the wellhead and the BOP. Accordingly, there is provided a system for de... | 09/25/2007 |
| 7252144 | Magnetometers for measurement-while-drilling applications A nuclear sensor on a bottomhole assembly (BHA) makes measurements of a property of an earth formation during continued rotation of the BHA. Magnetometers that are susceptible to bias error are deployed on the BHA to make measurements of the magnetic toolface angle.... | 08/07/2007 |
| 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 |
| 7234540 | Gyroscopic steering tool using only a two-axis rate gyroscope and deriving the missing third axis A two-axis gyroscope used on a bottom hole assembly can be used for determining a rate of rotation about the rotational axis of a BHA. The method takes advantage of possible misalignment of at least one axis of the two axis gyroscope from orthogonality with respect ... | 06/26/2007 |
| 7225550 | System and method for using microgyros to measure the orientation of a survey tool within a borehole A system and method for determining an orientation of the survey tool within a borehole utilizes a survey tool including a plurality of rotation sensors each having a sensing axis and a direction of least acceleration sensitivity. The plurality of rotation sensors a... | 06/05/2007 |
| 7150331 | System and method for tracking and communicating with a boring tool A system for determining the location of and communicating with a downhole tool assembly. A tracker assembly comprises a vertical transmitting antenna, a plurality of receiving antennas, and a processor. The downhole tool assembly has a beacon assembly comprising a ... | 12/19/2006 |
| 7143521 | Determination of borehole azimuth and the azimuthal dependence of borehole parameters A method for determining a borehole azimuth in a borehole is disclosed. In one exemplary embodiment, the method includes acquiring at least one standoff measurement and a tool azimuth measurement at substantially the same time. Such measurements are then processed, ... | 12/05/2006 |
| 7117605 | System and method for using microgyros to measure the orientation of a survey tool within a borehole A system and method for determining an orientation of the survey tool within a borehole utilizes a survey tool including a plurality of rotation sensors each having a sensing axis and a direction of least acceleration sensitivity. The plurality of rotation sensors a... | 10/10/2006 |
| 7119711 | Communicating with an underground object A data sonde for use in horizontal drilling is provided, the data sonde comprising an antenna for emitting a first modulated signal from the data sonde, the first signal comprising zero and non-zero emission components in different periods, and a receiver for receiv... | 10/10/2006 |
| 7103982 | Determination of borehole azimuth and the azimuthal dependence of borehole parameters A method for determining a borehole azimuth in a borehole is disclosed. In one exemplary embodiment, the method includes acquiring at least one standoff measurement and a tool azimuth measurement at substantially the same time. Such measurements are then processed, ... | 09/12/2006 |
| 7093370 | Multi-gimbaled borehole navigation system An omnidirectional borehole navigation system is provided that includes a housing that can be placed within the smaller diameter drill pipes used towards the bottom of a borehole, an outer gimbal connected to the housing, and at least two or more stacked inner gimba... | 08/22/2006 |
| 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 |
| 7065888 | Gyroscopic system for boresighting equipment A gyroscopic system for translating parallel and non-parallel lines between a reference line and a device to be aligned with respect to the reference line is provided. The system includes a first inertial sensor configured to be substantially stationary, the first i... | 06/27/2006 |
| 7002484 | Supplemental referencing techniques in borehole surveying A method for surveying a borehole is disclosed which uses first and second gravity measurement devices disposed at corresponding first and second positions in the borehole and a supplemental reference measurement device disposed at the first position. Exemplary supp... | 02/21/2006 |
| 6964107 | System, method, device and computer code product for improving the readability of an electronic compass A system, method, device and computer code product is disclosed for stabilizing compass heading under tilt error conditions from an uncorrected electronic compass reading. Exemplary embodiments include a stabilizing filter configured to filter out tilt errors incorp... | 11/15/2005 |
| 6957580 | System and method for measurements of depth and velocity of instrumentation within a wellbore A survey tool for use in a wellbore includes a downhole portion having an axis. The downhole portion is adapted to move within the wellbore with the axis generally parallel to the wellbore. The survey tool further includes a first acceleration sensor mounted at a fi... | 10/25/2005 |
| 6944545 | System and method for determining the inclination of a wellbore A well survey system comprising and electronic survey tool for determining the inclination of a wellbore is disclosed herein with methods of use. In some embodiments, the electronic survey tool includes an electrolytic tilt sensor adapted to measure a first tilt ang... | 09/13/2005 |
| 6918186 | Compact navigation system and method A compact navigation system for a rover is provided. The navigation system includes a housing configured to be transported by the rover; a gimbal system having two or more gimbals that includes at least an outer gimbal connected to the housing and an inner gimbal ne... | 07/19/2005 |
| 6895678 | Borehole navigation system An omnidirectional borehole navigation system is provided which features a housing for traversing a borehole; a gimbal system including at least one outer gimbal connected to the housing and at least one inner gimbal nested in and connected to the outer gimbal; a so... | 05/24/2005 |
| 6883240 | Borehole surveying The invention relates to a method and an apparatus for use in surveying boreholes. The method of the invention comprises the following steps: providing an instrument package in a leading end of a drillstring, the instrument package comprising first and second single... | 04/26/2005 |
| 6871410 | Autonomous apparatus and method for acquiring borehole deviation data An autonomous down hole survey tool and method for determining deviation angles of a well bore while tripping. The instrument package assembly is carried in a commercially available running gear and utilizes a low voltage solid state electronic apparatus in cooperat... | 03/29/2005 |
| 6845563 | Method and device for the measurement of the drift of a borchole A device and a method for the measurement of the angle of drift of a borehole that extends from the surface of the ground downwardly into the earth. The device comprises a generally hollow protective exterior casing, a microprocessor control; and, a sensor pack. At ... | 01/25/2005 |
| 6823602 | Continuous measurement-while-drilling surveying A continuous measurement-while-drilling surveying apparatus includes a fiber optic gyroscope sensitive to rotation about the tool spin axis of the bottom hole assembly and a second fiber optic gyroscope sensitive to rotation of the bottom hole assembly about an axis... | 11/30/2004 |
| 6668465 | Continuous measurement-while-drilling surveying A continuous measurement-while-drilling surveying apparatus includes a fiber optic gyroscope sensitive to rotation about the tool spin axis of the bottom hole assembly and a second fiber optic gyroscope sensitive to rotation of the bottom hole assembly ab... | 12/30/2003 |
| 6631563 | Survey apparatus and methods for directional wellbore surveying Wellbore survey methods and apparatus for wireline and measurement-while-drilling operations are disclosed which include a gyroscope, wherein the gyroscope has a spin axis, aligned with the instrument axis, and further having two sensitive axis orthogonal... | 10/14/2003 |
| 6588116 | Method for drilling under rivers and other obstacles A method of drilling under barriers (rivers, highways and the like) is set out. The horizontal drilling system mounts a guidance tool on the end of the drill string just behind the drill bit. The guidance tool includes a pair of right angle accelero meter... | 07/08/2003 |
| 6530154 | Method to detect deviations from a wellplan while drilling in the presence of magnetic interference A method for drilling a wellbore to assure the avoidance of a substantially adjacent known magnetic source comprising the steps of obtaining survey data for the path or trajectory of a known magnetic source; preparing a wellplan comprising a path or traje... | 03/11/2003 |
| 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 |
| 6460630 | Method and rock drilling apparatus for controlling rock drilling A method and a rock drilling apparatus for drilling holes in rock according to a predetermined drilling plan. The method comprises measuring the location of each hole in the rock by inserting a measuring device into the hole, and calculating the deviation... | 10/08/2002 |
| 6454023 | Mapping tool for tracking and/or guiding an underground boring tool Systems and associated methods for tracking and/or guiding an underground boring tool use one or more detectors to measure the intensity of an electromagnetic field which is transmitted from an underground boring tool. The measured intensities may then be... | 09/24/2002 |
| 6321456 | Method of surveying a bore hole A method for determining azimuth in well bore hole where the well is being drilled utilizing Measurement-While-Drilling (MWD) equipment, including gravitometer and magnetometer instruments in the presence of an adjacent well. Interference fields introduce... | 11/27/2001 |
| 6227310 | Method and apparatus for providing a magnetic direction reference A magnetic observatory device is deployed at a fixed location such as the sea bed to provide data measuring variations in the local earth magnetic field. This data is used to correct information from magnetic direction sensors, for example in a measuremen... | 05/08/2001 |
