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| Number | Title | Issue Date |
| 8069920 | Lateral well locator and reentry apparatus and method A down-hole assembly used to locate an existing window in a main cased well bore and guide equipment through the window and into a lateral well bore after removal of a whip stock. The assembly includes a running tool with a convex section detachably connected to a c... | 12/06/2011 |
| 7353867 | Whipstock assembly and method of manufacture The present invention discloses a whipstock assembly (100) for use in forming a lateral borehole from a parent wellbore. The whipstock assembly comprises a body (122) and a deflection member 120) above the body. The deflection member includes a ... | 04/08/2008 |
| 7331387 | Downhole window finder and method of using the same The present invention relates to a downhole method and apparatus for locating a window in a wellbore casing and determining the depth and orientation of said window. Apparatus of the present invention comprises a body (4) and a window engaging member (6 | 02/19/2008 |
| 7284607 | System and technique for orienting and positioning a lateral string in a multilateral system A technique that is usable with a subterranean well that has a first string that lines a borehole includes running a second string into the well and engaging a deflecting face of a deflector to deflect the second string into a window of the first string. The techniq... | 10/23/2007 |
| 7168606 | Method of mitigating inner diameter reduction of welded joints Aspects of the present invention provide methods and apparatus for connecting two tubulars using a welding process with reduced inner diameter flash. The method includes connecting an end of a first expandable tubular to an end of a second expandable tubular using a... | 01/30/2007 |
| 7077206 | Method and apparatus involving an integrated or otherwise combined exit guide and section mill for sidetracking or directional drilling from existing wellbores A section mill is positioned below an exit guide in a drill string assembly used to mill a section of steel casing below the whipstock and which as the section mill moves down and mills along the section of casing, causes the whipstock to be lowered down adjacent th... | 07/18/2006 |
| 7069996 | Completion of lateral well bores The present invention relates to the completion of lateral well bores and provides a method comprising the steps of installing a datum device in a main well bore so as to provide a datum height above the lateral: making a completion string (10) comprising a l... | 07/04/2006 |
| 7066272 | Sealed multilateral junction system A sealed multilateral junction system provides fluid isolation between intersecting wellbores in a subterranean well. In a described embodiment, a method of forming a wellbore junction includes the steps of sealing a tubular string in a branch wellbore to a tubular ... | 06/27/2006 |
| 7025144 | Wellbore liner system Wellbore apparatus has been invented which, in at least certain aspects, includes a wellbore apparatus having a tubular member with a top end, a bottom end, a hollow portion, and a window therethrough, a sleeve positioned within the hollow portion of the tubular mem... | 04/11/2006 |
| 6968903 | Orientable whipstock tool and method A whipstock assembly includes a whipstock body 8 having a whipstock center of gravity offset radially from the central axis of the whipstock body, a counterweight to releasably secured to the whipstock body, with a counterweight having an offset counterweight... | 11/29/2005 |
| 6937023 | Passive ranging techniques in borehole surveying A method for determining the location of a target subterranean structure from within an adjacent borehole is disclosed which uses first and second gravity measurement devices disposed at corresponding first and second positions in the adjacent borehole and a magneti... | 08/30/2005 |
| 6935422 | Expanding wellbore junction An expanding wellbore junction system, apparatus and methods are provided for forming a sealed wellbore intersection in a subterranean well. In one described method, an expandable wellbore junction is expanded within an under-reamed cavity in a wellbore. Intersectin... | 08/30/2005 |
| 6923274 | Retrievable pre-milled window with deflector An apparatus for drilling one or more holes at an angle to a wellbore. The apparatus includes a tubular housing defining one or more openings. Each opening is configured to provide an exit through which a drilling assembly drills to form a hole at an angle to the we... | 08/02/2005 |
| 6761217 | Downhole latch assembly and method of using the same Downhole apparatus for locating equipment in a required depth and orientation within a well bore, the apparatus comprising a body and a latching member mounted on said body so as to be movable between a retracted position and an extended position, wherein the latchi... | 07/13/2004 |
| 6755248 | One trip through tubing window milling apparatus and method A one-trip through tubing window milling system is disclosed. The whipstock is delivered with the mill and downhole motor in a downhole assembly which further includes MWD equipment for proper whipstock orientation. The entire assembly is run through tubing and the ... | 06/29/2004 |
| 6684953 | Wireless packer/anchor setting or activation The present invention discloses the concept of using, for the purpose of operating a well control tool such as setting a packer, slip or whipstock, wireless data signal emissions from a downhole telemetry instrument such as an MWD or LWD unit that is ener... | 02/03/2004 |
| 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 |
| 6244340 | Self-locating reentry system for downhole well completions A self-locating reentry system is provided to allow reliable reentry from a primary wellbore into one or more secondary wellbores. The reentry system may include one or more self-locating assemblies which may be engaged with selected portions of a lateral... | 06/12/2001 |
| 6209648 | Method and apparatus for connecting a lateral branch liner to a main well bore A method and apparatus for establishing connectivity of lateral branch liners to main well casings to achieve predictable and stable mechanical connectivity at the lateral junction of branch well bores to the main well bore to counter the problems of form... | 04/03/2001 |
| 6192748 | Dynamic orienting reference system for directional drilling A directional drilling control system allows dynamic orientation of downhole drilling equipment in unstable or corrupt natural magnetic fields without the use of gyroscopic measurement devices. The system is especially suited for sidetracking wells. The s... | 02/27/2001 |
| 6138756 | Milling guide having orientation and depth determination capabilities A milling guide assembly includes features permitting a milling guide to be accurately positioned within a subterranean well. In a described embodiment, a milling guide has a logging tool attached thereto and a wireline extending through the milling guide... | 10/31/2000 |
| 5579829 | Keyless latch for orienting and anchoring downhole tools A keyless latch assembly automatically aligns and fixes the axial and circumferential position of a whipstock within a surrounding casing joint. Alignment and fixing of the whipstock ensures proper engagement and orientation of a drill bit relative to an ... | 12/03/1996 |
| 5488989 | Whipstock orientation method and system A deflecting tool or whipstock is oriented and anchored in a well casing during a single trip of a running string so that a window can be formed in the wall of the casing at a selected azimuth. The angular orientation of the deflecting tool is measured, a... | 02/06/1996 |
| 4304299 | Method for setting and orienting a whipstock in a well conduit A method is provided for the angular orientation of a whipstock having an arcuate tool directing face and a whipstock anchor in a packer which is installed in a well, the packer and the anchor having longitudinally extending cooperable key elements engage... | 12/08/1981 |
