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| Number | Title | Issue Date |
| 7227362 | Electric power grid induced geophysical prospecting method and apparatus An underground prospecting method and apparatus that utilizes the harmonics and fractional harmonic waves induced into the earth by the electric power grid. The data are converted to amplitude-depth and phase-depth data. The resulting data may be plotted and are com... | 06/05/2007 |
| 7219749 | Single solenoid guide system Measurement of the location and direction of a drill head in a borehole extending beneath an obstacle such as a body of water utilizes a single AC solenoid at a known location but having an unknown orientation. The measurements are used to direct the path of the bor... | 05/22/2007 |
| 7116244 | Method and system for producing a magnetic field signal usable for locating an underground object Transmitted magnetic field signals useable for locating an underground object, and methods and systems for generating the same. The magnetic field signal has desired spectral characteristics. More specifically, the transmitted magnetic field signal includes a carrie... | 10/03/2006 |
| 7114580 | Method and apparatus for determining a trajectory of a directional drill An apparatus for determining a trajectory of a directional drill includes two length measurement devices deployed along a surface of the drill string and a controller capable of determining the heading of the drill string from two lengths of the drill string measure... | 10/03/2006 |
| 7111693 | System and method for locating and tracking a boring tool A system for monitoring the position and orientation of a downhole tool assembly having multiple beacons. In a preferred embodiment the first and second beacons are supported by the downhole tool assembly. Both beacons are adapted to transmit signals that are indica... | 09/26/2006 |
| 7107634 | Method and apparatus for cleaning a conduit A conduit cleaning or clearing apparatus and method has a housing assembly connectable to a pipeline. The housing has an inlet and outlet leg joined by a bight portion. A cleaning member is rotatably disposed within the housing and may be rotated from a first unobst... | 09/19/2006 |
| 7102532 | Subsea communication Methods of subsea communication in which a cathodic protection anode is used as a transmitting antenna. The signals are received at a second location by two electrodes which are spaced apart by different distances from the transmitting antenna. ... | 09/05/2006 |
| 7064677 | Method of monitoring service operations of a service vehicle at a well site A method monitors servicing operations of a vehicle capable for example of pumping various fluid treatments down into a well being serviced at a well site. The method records the vehicle's engine speed and the values of one or more service-related variables, such as... | 06/20/2006 |
| 7063145 | Methods and systems for heating a hydrocarbon containing formation in situ with an opening contacting the earth's surface at two locations In an embodiment, a method for heating a hydrocarbon containing formation may include providing heat from one or more heaters to an opening in the formation. A first end of the opening may contact the earth's surface at a first location and a second end of the openi... | 06/20/2006 |
| 7043204 | Through-the-earth radio A method and apparatus for effective through-the-earth communication involves a signal input device connected to a transmitter operating at a predetermined frequency sufficiently low to effectively penetrate useful distances through-the earth, and having an analog t... | 05/09/2006 |
| 7038454 | System and method for detecting an underground object using magnetic field sensing A system and method use magnetic field sensing to detect underground objects for strike avoidance. The system detects magnetic field components for both passive distortions in the magnetic field indicative of a ferromagnetic object and active magnetic fields that ar... | 05/02/2006 |
| 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 |
| 6978833 | Methods, apparatus, and systems for obtaining formation information utilizing sensors attached to a casing in a wellbore Improved methods, apparatus, and systems for obtaining information regarding a formation, a casing, or fluid within the casing utilize an interrogator and one or more sensing devices attached to a casing in a wellbore. The interrogator, which is located and typicall... | 12/27/2005 |
| 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 |
| 6968735 | Long range data transmitter for horizontal directional drilling An apparatus for monitoring conditions in subterranean borehole during drilling and pullback operations in real time. The apparatus includes a drill string having a working end. A measurement system suitable for measuring at least one operational characteristic of t... | 11/29/2005 |
| 6850161 | Systems and methods for identifying and mapping conduit location A system (100) for mapping an underground object (145) includes a conduit location recording device 105 and a server (115). The conduit location recording device (105) senses an underground object (145), a unique identifier ... | 02/01/2005 |
| 6833795 | Underground utility detection system and method employing ground penetrating radar An apparatus and method are employed to detect underground objects for use with a horizontal directional drilling (HDD) machine. A drill pipe is configured to cooperate with the HDD machine to produce a horizontal bore. A transmit apparatus is provided with the dril... | 12/21/2004 |
| 6417666 | Boring tool tracking system and method using magnetic locating signal and wire-in-pipe data A system is described in which a boring tool is moved through the ground in a region using a drill rig and associated drill string to move the boring tool in a forward direction or in a reverse direction, respectively, through the ground. The boring tool ... | 07/09/2002 |
| 5880680 | Apparatus and method for determining boring direction when boring underground A guidance module for an underground horizontal boring assembly. The module determines the pitch angle of the boring tool independent of roll using a single accelerometer sensor. The accelerometer sensor has a single sensitive axis which is aligned parall... | 03/09/1999 |
| 5819859 | Apparatus and method for detecting an underground structure An apparatus and method for locating an underground object or structure by employment of a radar-like probe and detection technique is disclosed. The underground structure is provided with a device which generates a specific signature signal in response t... | 10/13/1998 |
| 5720354 | Trenchless underground boring system with boring tool location An apparatus and method for locating an underground boring tool using a radar-like probe and detection technique. A boring tool is provided with a device which generates a specific signature signal in response to a probe signal transmitted from above the ... | 02/24/1998 |
| 5585726 | Electronic guidance system and method for locating a discrete in-ground boring device A guidance system for a drill tool (60) comprising a primary navigation package (80) and a secondary navigation package (74). The primary navigation package contains a triaxial magnetometer and a triaxial accelerometer. The set of signals produced by the ... | 12/17/1996 |
| 5258755 | Two-source magnetic field guidance system A magnetic field guidance system for guiding a movable carrier such as a drill assembly with respect to a fixed target includes a pair of magnetic field sources at one location, such as the carrier, and a highly sensitive magnetic field detector at the ot... | 11/02/1993 |
| 4881083 | Homing technique for an in-ground boring device The homing technique for directing an in-ground boring device through the ground from its particular location to a specific target point is disclosed herein. In accordance with this technique, an electromagnetic dipole field containing a predetermined hom... | 11/14/1989 |
| 4700142 | Method for determining the location of a deep-well casing by magnetic field sensing Logging apparatus for measuring alternating magnetic fields generated by electric current flow on a subterranean target near a borehole is disclosed. Electric current of a predetermined temporal form is made to flow on the target; the resulting magnetic f... | 10/13/1987 |
| 4646277 | Control for guiding a boring tool A control system guides a boring tool in a borehole. The tool has a longitudinal tool axis and includes a driver for advancing the tool axially through the earth and steering mechanism for directing the motion of the tool relative to the tool axis in resp... | 02/24/1987 |
| 4637480 | Azimuth measuring method for non-vertical drilling In a method of measuring azimuth for non-vertical drilling, during rotation of the drill pipe string two components of the magnetic field are measured continuously within a cylindrical section of the drill pipe string. This section is fabricated from the ... | 01/20/1987 |
| 4575014 | Vertical shaft impact crusher rings A vertical shaft impact crusher is provided, having a cylindrical tank in which the rotor is mounted for rotation about a vertical axis and for receiving rock fed axially from above and having impeller shoes for accelerating and throwing the rock outward ... | 03/11/1986 |
| 4361192 | Borehole survey method and apparatus for drilling substantially horizontal boreholes 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 s... | 11/30/1982 |
| 4337392 | Position detector for a power rodding apparatus A power rodding apparatus is often used in conjunction with laying telephone cable through underground conduits. For such applications the exact location of the end of the rod is important and is determined by a position detecting circuit. The circuit inc... | 06/29/1982 |
| 4181014 | Remote well signalling apparatus and methods Information is conducted upwardly from a location deep within a well by a transmitter which is located in the well and induces electrical currents in the surrounding earth formation. These currents are sensed at an upper location by readout equipment conn... | 01/01/1980 |
