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| Number | Title | Issue Date |
| 6349768 | Method and apparatus for all multilateral well entry In one embodiment, the invention relates to a method for location, or location and entry, of a lateral wellbore from a main wellbore of a multilateral hydrocarbon well, the method being characterized by unique operation of a controllably bent sub. The inv... | 02/26/2002 |
| 6315062 | Horizontal directional drilling machine employing inertial navigation control system and method A system and method for controlling an underground boring tool involves the use of one or more of a gyroscope, accelerometer, and magnetometer sensor provided in or proximate the boring tool. The location of the boring tool is detected substantially in re... | 11/13/2001 |
| 6298915 | Orienting system for modular guns A stinger is fabricated with an orientating key. The stinger is lowered into a wellbore and remains atop a downhole assembly. The angular orientation of stinger with respect to the downhole assemble is also adjustable prior to entering the wellbore. The s... | 10/09/2001 |
| 6283208 | Orienting tool and method An assembly for formation and completion of deviated wellbores is disclosed which includes a toolguide and a casing section which can be used together or separately. The toolguide includes a lower orienting section and a whipstock having a sloping face, c... | 09/04/2001 |
| 6260618 | Method for locating placement of a guide stock in a multilateral well A method for locating placement of a guide stock in a multilateral well wherein the guide stock is properly aligned with the lateral borehole. The method employs an impression packer with a scribed reference line to provide information at the surface rega... | 07/17/2001 |
| 6244339 | Apparatus for and a method of drilling a lateral borehole An apparatus and method of drilling and lining a lateral borehole, the apparatus comprising first and second casing sections joined at an obliquely angled rotatable joint allowing the two sections to be rotated relative to one another so that the longitud... | 06/12/2001 |
| 6199635 | Shifting apparatus and method for use in tubular strings for selective orientation of tubular strings below the shifting apparatus This invention relates to a shifting apparatus and method for use with a tubular string set in a well for unlocking, selective orientation and relocking of sections of the tubular string below the shifting apparatus of this invention, while the tubular st... | 03/13/2001 |
| 6173773 | Orienting downhole tools A method and apparatus of orienting a tool in a wellbore includes running an orientation string into the wellbore, the orienting string including a positioning device, a measurement device (e.g., a gyroscope), and the tool. The orientation string is posit... | 01/16/2001 |
| 6145378 | Aided inertial navigation system The invention relates particularly to sensing devices and techniques which may be used to provide measurement data to aid an inertial navigation system, or attitude and heading reference system, and so bound the growth of errors which increase with time i... | 11/14/2000 |
| 6076268 | Tool orientation with electronic probes in a magnetic interference environment An apparatus and method for orienting directional tools within a bore hole by recognizing and compensating for field biases brought about by ferromagnetic anamolies surrounding the bore hole, ferromagnetic casing strings and electrical/electronic tool com... | 06/20/2000 |
| 6032739 | Method of locating wellbore casing collars using dual-purpose magnet A method for sensing the location of a casing collar within a wellbore and for orientating a tool circumferentially and radially employs the use of a compact dual-purpose magnet. The method includes offsetting the position of the magnet relative to the to... | 03/07/2000 |
| 6003599 | Azimuth-oriented perforating system and method An apparatus for positioning a tool, such as a perforating gun, in a wellbore to orient the tool in a desired direction. An anchor having a first reference terminal is set in the wellbore, the first reference terminal pointing in a known direction. A seco... | 12/21/1999 |
| 5996711 | Method and apparatus for locating indexing systems in a cased well and conducting multilateral branch operations A method and apparatus for positioning and accurately orienting well service equipment within a well casing having an indexing coupling therein to permit the conduct of selected well service operations. A well logging sonde including an ultrasonic scanner... | 12/07/1999 |
| 5947213 | Downhole tools using artificial intelligence based control The present invention provides a system for performing a desired operation in a wellbore. The system contains a downhole tool which includes a mobility platform that is electrically operated to move the downhole tool in the wellbore and an end work device... | 09/07/1999 |
| 5767400 | Hydraulic test system mounted with borehole television set for simultaneous observation in front and lateral directions The present invention provides a hydraulic test system, by which it is possible to select a proper position and to select a reliable measurement interval corresponding to said position, to obtain information for preventing retention or leaving of the equi... | 06/16/1998 |
| 5720344 | Method of longitudinally splitting a pipe coupling within a wellbore A method of removing a pipe string anchored in cement within a wellbore involves the use of a coupling cutter having a linear charge that is magnetically oriented radially and rotationally within the pipe. The coupling cutter also has a coupling sensor th... | 02/24/1998 |
| 5678643 | Acoustic logging while drilling tool to determine bed boundaries A LWD tool is disclosed for detecting the existence of and distance to adjacent bed boundaries. A transmitter assembly generates either a short acoustic pulse or a swept frequency signal that is detected by an associated receiver assembly. The received si... | 10/21/1997 |
| 5582248 | Reversal-resistant apparatus for tool orientation in a borehole An orienting device for a perforator or the like to permit directing the tool at a selected angle relative to a ferrous element such as an adjacent casing string, and further an orienting device which is resistant to signal reversal resulting from ferrous... | 12/10/1996 |
| 5394950 | Method of drilling multiple radial wells using multiple string downhole orientation A method of drilling radial boreholes from a first borehole without withdrawing the drill string from the hole, by providing a first carrier string, a drill string within the carrier string, and a method for orienting the position of the carrier string re... | 03/07/1995 |
| 5394941 | Fracture oriented completion tool system A fracture oriented completion tool system for use in a casing string in a wellbore. The completion tool comprises a casing valve having a radioactive source therein, the orientation of which may be determined by use of a detector apparatus, such as a rot... | 03/07/1995 |
| 5351755 | Method and apparatus for establish the orientation of tools in a cased borehole The steel casing of a well is deliberately magnetized with a known orientation by the passage therethrough of a tool having a demagnetizing section and a magnetizing section along with a gyrocompass section and a magnetic compass section. The casing is fi... | 10/04/1994 |
| 5335724 | Directionally oriented slotting method A method of fracturing a subterranean formation having a well bore extending thereinto. The method comprises the steps of: (a) placing a jetting tool in the well bore such that the jetting tool is positioned within the subterranean formation, the jetting ... | 08/09/1994 |
| 5269374 | Locator method and apparatus This invention relates to the method and apparatus for locating and indicating collars and tubing ends through the use of a locator capable of repetitive use in a number of runs downhole in any given tubing situation. Specifically, this invention relates ... | 12/14/1993 |
| 5105894 | Method and apparatus for orientating core sample and plug removed from sidewall of a borehole relative to a well and formations penetrated by the borehole A method and apparatus for determining the location in space of a formation sample is set forth. This involves a tool which is typically run on a wireline in a well, the tool supporting orthogonal positioned magnetometers and similar orthogonal accelerome... | 04/21/1992 |
| 5103177 | Method and apparatus for determining the azimuth of a borehole by deriving the magnitude of the terrestial magnetic field BZe Borehole surveying methods and apparatus for surveying the true longitudinal magnetic field within a substantially non-magnetic drill collar. A plurality of longitudinal magnetic field measurements are made to provide a longitudinal-position-dependent ser... | 04/07/1992 |
| 4026363 | Apparatus and method for performing a desired operation at a specified location in a well An apparatus and method for performing a desired operation in a selected mandrel in a well. The apparatus includes a running assembly with selector stop means and operating tool means. The running assembly is run in the tubing string until the selector st... | 05/31/1977 |
