Patents
Sitemap › E21 - Earth or rock drilling; Mining › E21B - Earth or rock drilling; Obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells › E21B 7 - Special methods or apparatus for drilling
Patents for E21B 7 - Special methods or apparatus for drilling (22,064)
08/1998
08/13/1998CA2507746A1 Methods of completing a subterranean well and associated apparatus
08/13/1998CA2229104A1 Methods of completing a subterranean well and associated apparatus
08/12/1998EP0857853A2 Drill bit for horizontal directional drilling of rock formations
08/12/1998EP0857852A2 Method for horizontal directional drilling of rock formations
08/12/1998EP0857249A2 Closed loop drilling system
08/12/1998EP0857247A1 Assembly and process for drilling and completing multiple wells
08/12/1998EP0765427B1 Hinged drilling tool
08/12/1998EP0720684B1 Method of and apparatus for horizontal well drilling
08/12/1998CN1190150A Drill bit for horizontal directional drilling of rock formations
08/12/1998CN1190149A Method for horizontal directional drilling of rock formations
08/11/1998US5791424 Drill bit for the rotary-percussive drilling of preferably rock, concrete or the like
08/11/1998US5791419 Drilling apparatus for replacing underground pipes
08/11/1998US5791417 Tubular window formation
08/06/1998WO1998034007A1 Tool and method for drilling a lateral well
08/06/1998WO1998034006A1 Tool for making an opening in a tubular in a wellbore
08/06/1998WO1998034003A1 Drilling assembly with a steering device for coiled-tubing operations
08/05/1998EP0836668A4 Multi-activity offshore exploration and/or development drilling method and apparatus
08/04/1998US5788418 Detachable connector for the transmission of drive energy to submersible pile drivers, cut-off equipment or similar work units
08/04/1998US5788082 Wafer carrier
08/04/1998US5787998 Down hole pressure intensifier and drilling assembly and method
08/04/1998US5787987 Lateral seal and control system
08/04/1998US5787983 Methods of delaying well destruction due to subsidence
08/04/1998US5787978 Multi-face whipstock with sacrificial face element
07/1998
07/30/1998WO1998032951A2 Method and device for driving bore-holes, especially in the sea bed, using a guide tip
07/29/1998EP0855490A2 Drilling apparatus and downhole torque generator
07/29/1998EP0855489A2 Earth displacement drill
07/28/1998US5785458 Trenchless pipeline replacement
07/28/1998US5785258 Method and apparatus for conditioning fluid flow
07/28/1998US5785134 System for in-situ replacement of cutting means for a ground drill
07/28/1998US5785133 Multiple lateral hydrocarbon recovery system and method
07/23/1998WO1998031915A2 Apparatus for directing and steering the foremost part of a drillpipe at drillings
07/23/1998CA2278804A1 Apparatus for directing and steering the foremost part of a drillpipe at drillings
07/22/1998EP0646213B1 Process and tool for laying underground collector mains for liquids and gases
07/22/1998CA2227602A1 Earth displacement drill
07/21/1998US5782414 Contoured supersonic nozzle
07/21/1998US5782311 Method and apparatus for installation of underground pipes
07/16/1998WO1998030350A1 Device for trenchless replacement of underground pipe
07/16/1998DE19701172A1 Magazine and carriage for sections of drill rod
07/15/1998EP0852653A1 Method and apparatus for selective horizontal well re-entry using retrievable diverter oriented by logging means
07/15/1998EP0852652A1 Method for isolating multi-lateral well completions while maintaining selective drainhole re-entry access
07/14/1998US5778992 Drilling assembly for drilling holes in subsurface formations
07/14/1998US5778991 Directional boring
07/14/1998US5778988 Drilling apparatus
07/14/1998US5778987 Guided drilling system with shock absorber
07/14/1998US5778980 Multicut casing window mill and method for forming a casing window
07/09/1998WO1998029637A1 Lockable swivel apparatus and method
07/08/1998EP0852282A2 Method of constructing a well
07/08/1998EP0851966A1 System for selective re-entry to completed laterals
07/07/1998US5775841 Device for use in replacing sewage piping
07/07/1998US5775444 Drill string orienting motor
07/07/1998US5775428 Whipstock-setting apparatus
07/03/1998CA2225762A1 Methods of delaying well destruction due to subsidence
07/02/1998DE19700974A1 Adaptor to fill hollow spaces for ditchless laying of pipe conduits in ground
07/02/1998DE19654654A1 Borehole casing method suitable for unsure formations
07/02/1998DE19651586A1 Light, efficient piling rig including drilling tool with cased section carrying shallow spirals
07/01/1998EP0627040B1 Method for overburden drilling, casing shoe and casing tube for the method, and coupling element for the casing tubes
07/01/1998CN1038957C Wireless automatic orietation system attached to drills
06/1998
06/30/1998US5773785 Plasma cutting apparatus for concrete structures
06/30/1998US5772362 To locate in the ground poles for supporting a racing rail assembly
06/30/1998US5771985 Earth penetrating apparatus for obtaining sediment samples, driving instrument probes, pilings, or sheet pilings
06/30/1998US5771984 In a geological formation by spallation; geothermal
06/30/1998US5771972 One trip milling system
06/24/1998EP0781369B1 Apparatus for milling a well casing
06/24/1998CN2284856Y Side-drilling tool with well shutting-in function
06/24/1998CN1185515A Side drilling tool with well enclosing function
06/23/1998US5769173 Vibration exciter machine
06/23/1998US5769167 Thru tubing whipstock and method
06/23/1998US5769166 Wellbore window milling method
06/23/1998US5768940 Sample collector
06/18/1998WO1998026151A2 Method and device for driving bore holes, specially exploring and extraction drillings in the sea bottom
06/18/1998DE19651431A1 Shot-blaster with in-hole head trigger and charge
06/17/1998CN2284294Y Level well propellor
06/17/1998CN1185200A Process and equipment for pulling pipes laid or to be laid in the ground
06/16/1998US5765756 Abrasive slurry jetting tool and method
06/16/1998US5765653 Reaming apparatus and method with enhanced stability and transition from pilot hole to enlarged bore diameter
06/16/1998US5765437 Compost aerator and monitor
06/16/1998CA2150358C Method and apparatus for setting a whipstock
06/11/1998WO1998025003A1 Single riser with two wellheads
06/11/1998CA2273101A1 Single riser with two wellheads
06/10/1998EP0846837A2 Subterranean well bore casing milling apparatus
06/10/1998EP0846836A2 Retrievable guide anchor assembly and methods for milling a well casing
06/10/1998EP0846216A1 Multi-linked working boom for working machine
06/10/1998EP0729555A4 Improved guided mole
06/09/1998US5762148 Boring tool
06/09/1998US5762143 System and method for placement and retrieval of a subsurface diverting tool used in drilling and completing wells
06/05/1998CA2192131A1 Drilling with casing and retrievable bit-motor assembly
06/04/1998WO1998023846A1 System, vessel, seabed installation and method for producing oil or gas
06/04/1998DE19702983C1 Drilling head adapting efficiently to both soft and hard going
06/03/1998EP0845576A2 Drill string
06/03/1998EP0845071A1 Through-tubing lateral re-entry
06/03/1998EP0845070A1 Scraper for removing an earth core from a pipe laid without excavation
06/03/1998CN2283123Y Multiple folding face whipstock for opening window side drill
06/02/1998US5758732 Control device for drilling a bore hole
06/02/1998US5758730 Method for removing an earth core out of a pipe laid in trench-less manner and go-devil for implementing the method
06/02/1998CA2018610C Pipe burster
05/1998
05/28/1998WO1998022689A2 Whipstock
05/28/1998DE19710308A1 Method for extracting soil samples and sample extraction device
05/27/1998EP0844364A2 Device for removing drill cuttings from augers
05/27/1998EP0843774A1 Method for controlled fragmentation of hard rock and concrete by the combination use of impact hammers and small charge blasting
05/27/1998EP0756666B1 Moling apparatus
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