| Patents for E21B 7 - Special methods or apparatus for drilling (22,064) |
|---|
| 07/30/1997 | EP0725757A4 Excavating equipment |
| 07/30/1997 | CN1155613A Method of nozzling while drilling with controllable negative pressure and apparatus thereof |
| 07/30/1997 | CN1035523C Automatic controller of well inclination |
| 07/29/1997 | US5651415 System for selective re-entry to completed laterals |
| 07/24/1997 | WO1997026435A1 Arrangement for leading flexible elements to a rock drill, and a hose reel structure |
| 07/24/1997 | WO1997015749A3 Closed loop drilling system |
| 07/23/1997 | EP0784730A1 Pressure converter |
| 07/23/1997 | EP0784729A1 Pressure converter iii |
| 07/23/1997 | EP0719375A4 Negative pressure vortex nozzle |
| 07/22/1997 | US5649595 Milling method for liners extending into deviated wellbores |
| 07/17/1997 | WO1997025519A1 Trenchless underground boring system with boring tool location |
| 07/17/1997 | DE19610239C1 Device for enlarging cross-section of pilot bore or for replacing old pipe |
| 07/17/1997 | CA2241808A1 Trenchless underground boring system with boring tool location |
| 07/16/1997 | EP0607135B1 Pulsation nozzle, for self-excited oscillation of a drilling fluid jet stream |
| 07/15/1997 | US5647442 Drill rig with carrier/mast safety interlock |
| 07/15/1997 | US5647437 Thru tubing tool and method |
| 07/15/1997 | US5647436 Method of forming a window in a downhole tubular |
| 07/10/1997 | WO1997024508A1 Drill string orienting tool |
| 07/10/1997 | WO1997024493A1 Method and apparatus for forming piles in-situ |
| 07/02/1997 | EP0781369A2 Apparatus for milling a well casing |
| 07/02/1997 | CN1153249A Shaped pile hole blasting monolithic forming method |
| 07/01/1997 | US5642786 Securing and tensioning device for a towing cable connected to a percussion boring machine |
| 06/26/1997 | WO1997013954A3 Mill for wellbore milling operations |
| 06/24/1997 | USRE35542 Pipe bursting and replacement method |
| 06/24/1997 | US5641027 For drilling into surface rock |
| 06/19/1997 | WO1997021903A1 Apparatus and method for forming a window or an outline thereof in the casing of a cased wellbore |
| 06/19/1997 | WO1997021900A1 Fluid drilling system |
| 06/17/1997 | US5639183 Installing cable-ducts |
| 06/17/1997 | US5638911 For use with a vehicle |
| 06/17/1997 | US5638910 Downhole sub for directional drilling |
| 06/12/1997 | DE19545219A1 Method and appliance for laying pipes, especially sewage pipes |
| 06/12/1997 | DE19542091C1 Bore sample extraction device |
| 06/11/1997 | EP0778392A2 Method and apparatus for removing the uppermost part of a construction in the seabed |
| 06/11/1997 | EP0777815A1 Arrangement in boom for rock drilling unit |
| 06/11/1997 | EP0777814A1 Arrangement for controlling boom for rock drilling unit |
| 06/11/1997 | EP0777812A1 Device for drilling holes and/or slits |
| 06/11/1997 | CN1151468A Boring jig and method for producing pile in borehole |
| 06/10/1997 | US5636699 Mobile hauling vehicle |
| 06/10/1997 | US5636692 Casing window formation |
| 06/04/1997 | EP0777033A2 Side pocket mandrel for gas lift wells and method for its manufacturing |
| 06/04/1997 | EP0693158B1 Ground displacement auger head for making piles in the ground |
| 06/03/1997 | US5635653 Ground water sampling device |
| 06/02/1997 | CA2188725A1 Torque control device for downhole milling |
| 05/28/1997 | EP0775802A2 Method and apparatus for directional drilling |
| 05/27/1997 | US5632604 Down hole pressure pump |
| 05/27/1997 | US5632349 Vortex drill bit |
| 05/22/1997 | WO1997018380A1 Riser that is to be detached near the water surface |
| 05/21/1997 | EP0774563A2 Method and apparatus for navigational drilling |
| 05/21/1997 | CN1150210A Sealing shaft sinking method |
| 05/20/1997 | US5630477 Downcrowdable telescopic augering apparatus |
| 05/14/1997 | EP0772727A1 Drilling support unit to be mounted on an excavator boom |
| 05/14/1997 | EP0772725A1 Method and apparatus of installing a whipstock |
| 05/14/1997 | EP0772724A1 Method for steering a drill bit while drilling a bore hole |
| 05/14/1997 | CN1149663A Movement controller for drilling system of horizontal radial well |
| 05/14/1997 | CN1149662A Positive and negative circulation impact holing method |
| 05/13/1997 | US5628585 Method and apparatus for removal of utility line and replacement with polyolefin pipe |
| 05/09/1997 | WO1997016622A1 A drilling assembly, a coupling device for such drilling assembly, and a method of drilling holes in the underground using the drilling assembly |
| 05/07/1997 | DE19549160C1 Rotary impact drill mechanism |
| 05/02/1997 | EP0770760A1 A drilling assembly for drilling holes in subsurface formations |
| 05/02/1997 | EP0770223A1 Transmission line installation |
| 05/02/1997 | EP0631645A4 Down reaming apparatus. |
| 05/01/1997 | WO1997015749A2 Closed loop drilling system |
| 05/01/1997 | WO1997015747A1 Assembly and process for drilling and completing multiple wells |
| 04/30/1997 | DE19538557A1 Process to replace buried gas or water supply pipes in sections |
| 04/27/1997 | CA2188332A1 Drilling assembly for drilling holes in subsurface formations |
| 04/24/1997 | DE19536778C1 Groundwater seal forming machine for continuous seals against metal contaminants |
| 04/23/1997 | EP0629259B1 A method and a device for sealing between a casing and a drill hole in rock drilling operations |
| 04/23/1997 | CN2252877Y Directional drilling end hole drilling machine |
| 04/22/1997 | US5622672 Ignition of thermal lance and means and method for use therewith and therefor |
| 04/22/1997 | US5622231 Cutting head |
| 04/22/1997 | CA2123293C Movable joint bent sub |
| 04/18/1997 | CA2186657A1 Method and apparatus for retrieving a whipstock |
| 04/17/1997 | WO1997013954A2 Mill for wellbore milling operations |
| 04/17/1997 | DE19637991A1 Injection device for pressurised cement suspension |
| 04/16/1997 | EP0768446A1 Method and boring tool for drilling into subterranean formations |
| 04/16/1997 | CN2252233Y Crawler vertical shaft drilling machine |
| 04/16/1997 | CN1034599C Crawling device |
| 04/16/1997 | CN1034598C Flow control type vibration-jet device for drill bit |
| 04/15/1997 | US5620051 Whipstock |
| 04/10/1997 | DE19536028A1 Method of forming boreholes in prepn. for explosive operations |
| 04/09/1997 | EP0679216B1 Method for determining borehole direction |
| 04/09/1997 | CN1034511C Drilling method for active clay ground |
| 04/08/1997 | US5617926 Steerable drilling tool and system |
| 04/03/1997 | WO1997012117A1 System for selective re-entry to completed laterals |
| 04/03/1997 | WO1997012114A1 Method of producing a cased extraction hole |
| 04/03/1997 | WO1997012113A1 Method and apparatus for selective horizontal well re-entry using retrievable diverter oriented by logging means |
| 04/03/1997 | WO1997012112A1 Method for isolating multi-lateral well completions while maintaining selective drainhole re-entry access |
| 04/03/1997 | DE19535906A1 Verfahren zur Herstellung einer verrohrten Gewinnungsbohrung A process for producing a cased production borehole |
| 04/02/1997 | EP0765430A1 Soil sampler |
| 04/02/1997 | EP0765427A1 Hinged drilling tool |
| 04/01/1997 | US5615976 Double walled pipe, jacking method and pipe end structure of leading pipe |
| 04/01/1997 | US5615740 Casting assembly for use in drilling lateral boreholes |
| 03/27/1997 | WO1997011249A1 A method and apparatus for producing a sidetrack bore from a main wellbore |
| 03/26/1997 | EP0764234A1 Whipstock assembly |
| 03/26/1997 | CN2250415Y Rotary drilling device for deep penetration hole |
| 03/25/1997 | US5613567 Process for completing a well |
| 03/25/1997 | US5613559 Decentralizing centralizing locating and orienting subsystems and methods for subterranean multilateral well drilling and completion |
| 03/20/1997 | WO1997010410A1 Drilling process and device |
| 03/20/1997 | WO1997010409A1 Window-cutting system for downhole tubulars |
| 03/20/1997 | DE19534173A1 Blasting subterranean borehole with shock waves generated by high voltage electrical discharges |