| Patents for E21B 7 - Special methods or apparatus for drilling (22,064) |
|---|
| 11/16/1991 | CA2042557A1 Lift through plug container for slant rig |
| 11/14/1991 | WO1991017339A1 Method and apparatus for drilling and coring |
| 11/14/1991 | WO1991008370A3 Device for steering the foremost part of a drill pipe |
| 11/13/1991 | EP0456526A1 Apparatus and method for adjusting the azimut of the trajectory of a rotary drilling tool |
| 11/13/1991 | EP0455994A2 Eccentric drive for radially oscillating rollers, rolling cutters and milling drilling tools |
| 11/13/1991 | EP0455949A2 Boring ram for the destructive replacement of a buried pipe |
| 11/12/1991 | WO1991018183A1 Underground fluid sampling system |
| 11/12/1991 | US5064006 Downhole combination tool |
| 11/12/1991 | US5064002 Concentric drill rod assemblies for percussion rock drills |
| 11/12/1991 | CA2082642A1 Underground fluid sampling system |
| 11/12/1991 | CA1291945C Modular near-surface completion system |
| 10/31/1991 | WO1991016525A1 System for controlling direction of underground excavator |
| 10/31/1991 | WO1991016520A1 A borehole, as well as a method and an apparatus for forming it |
| 10/31/1991 | DE3941081A1 System involving lost rock drills and probes - employs drill of appropriate dia. with lateral slots for expulsion of drilled-out material |
| 10/30/1991 | EP0453839A2 Crane-mounted drill and method for in-situ treatment of contaminated soil |
| 10/29/1991 | US5060737 Drilling system |
| 10/29/1991 | US5060736 Steerable tool underreaming system |
| 10/29/1991 | US5060735 Device for positioning of a drill bit |
| 10/29/1991 | US5060734 Seawater hydraulic rock drill |
| 10/29/1991 | US5060731 Method of installing well conductors |
| 10/27/1991 | CA2039660A1 Crane-mounted drill and method for in-situ treatment of contaminated soil |
| 10/23/1991 | EP0453076A1 Plasma blasting method |
| 10/22/1991 | US5058688 Convertible vibratory or rotary core drill apparatus |
| 10/22/1991 | US5058686 Sliding-weight operated hole boring tool |
| 10/17/1991 | WO1991015655A1 Rock bed excavator |
| 10/16/1991 | EP0451683A2 Propulsion process of buried pipe |
| 10/16/1991 | CN1014334B Whipstock packer assembly |
| 10/15/1991 | US5056269 Apparatus for working in pipes |
| 10/15/1991 | US5056242 Underground wall construction method and apparatus |
| 10/09/1991 | EP0450207A1 Downhole drilling tool system |
| 10/08/1991 | US5054858 Selectively phased water supply of a cutter head |
| 10/08/1991 | US5054677 Pipe burster |
| 10/08/1991 | US5054565 Steering mechanism for a subsoil boring apparatus |
| 10/08/1991 | CA1290318C Pipe burster |
| 10/03/1991 | WO1991014851A1 Propelling system in small diameter pipe propeller |
| 10/02/1991 | DE4006320C1 Straight line tunnel borer - has guide tube to which casing is connected with load-out conveyor |
| 10/02/1991 | CN1055033A Drag analysis method |
| 10/02/1991 | CN1014162B Multifunctional hydraulic direction-changing apparatus for drill bit |
| 10/01/1991 | US5052502 Apparatus for directional coring |
| 10/01/1991 | US5052501 Adjustable bent housing |
| 09/25/1991 | EP0448397A2 Method and apparatus for drilling a highly angulated wellbore |
| 09/24/1991 | US5051036 Method of installing lean-to well protector |
| 09/24/1991 | US5050692 Method for directional drilling of subterranean wells |
| 09/24/1991 | US5050688 Rock drill feed support |
| 09/24/1991 | US5050673 Lift through plug container for slant rig |
| 09/24/1991 | US5050320 Multi-shaft kneading auger system |
| 09/24/1991 | CA2037449A1 Drill pipe with helical ridge for highly angulated wellbore |
| 09/17/1991 | US5048793 Pipe jack |
| 09/17/1991 | US5048621 Adjustable bent housing for controlled directional drilling |
| 09/11/1991 | EP0414891A4 Method and device for trench-free laying of pipelines |
| 09/11/1991 | CN2084508U Metal pellet for cutting and grinding |
| 09/10/1991 | US5046568 Driven groundwater sampling device |
| 09/05/1991 | WO1991013283A1 Method of trench-free replacement of pipeline |
| 09/05/1991 | WO1991013237A1 Drag analysis method |
| 09/05/1991 | WO1991013216A1 Device for laying pipes in the ground |
| 09/04/1991 | EP0444974A1 Method and device for the replacement of underground pipelines |
| 09/04/1991 | EP0444217A1 Method for trenchless replacement of a pipeline |
| 09/04/1991 | CN1013781B Well penetration apparatus and method |
| 09/03/1991 | WO1991012987A1 Self propelled probe, particularly for penetrating a powdered material |
| 09/03/1991 | US5044450 Spar-buoy boring derrick and mooring facility |
| 09/03/1991 | US5044198 Method of predicting the torque and drag in directional wells |
| 09/03/1991 | CA2055461A1 Self-propelled probe, particularly for penetrating pulverulent materials |
| 08/29/1991 | WO1991013225A1 Apparatus and method for building a foundation for uprights or for making passages therethrough |
| 08/29/1991 | DE4003747A1 Forward thrust piece for pipe laying - consists of perforated thrust cone and cable and rocket assembly |
| 08/28/1991 | EP0442994A1 Method of studying pressure combustion processes of stoichiometrically burning hydrogen/oxygen under high pressures |
| 08/27/1991 | US5042600 Drill pipe with helical ridge for drilling highly angulated wells |
| 08/27/1991 | US5042597 Horizontal drilling method and apparatus |
| 08/22/1991 | WO1991012406A1 A down-the-hole drill tool for drilling in advance of a casing tube |
| 08/22/1991 | DE4005356A1 Multi-chassis vehicles - has drives to at least two wheels at each chassis to overcome obstacles |
| 08/21/1991 | CN1053939A Automatic controller of well inclination |
| 08/20/1991 | US5040621 Flushing means for drilling tools |
| 08/20/1991 | US5040620 Methods and apparatus for drilling subterranean wells |
| 08/20/1991 | US5040601 Horizontal well bore system |
| 08/17/1991 | WO1991012407A1 Pipe alignment device |
| 08/17/1991 | CA2075918A1 Pipe alignment device |
| 08/14/1991 | EP0441686A1 Sealed connection device for two identical pipes |
| 08/13/1991 | USRE33660 Apparatus for drilling a curved borehole |
| 08/13/1991 | US5039253 Method for trenchless laying of pipes and an arrangement for carrying out the method |
| 08/13/1991 | US5038872 Drill steering apparatus |
| 08/13/1991 | US5038870 Ice auger cutter |
| 08/08/1991 | WO1991011646A1 Utility tunneling method and apparatus |
| 08/07/1991 | EP0439600A1 Drill. |
| 08/02/1991 | CA2034852A1 Process and device for replacing an underground pipe |
| 07/31/1991 | EP0439080A1 Earth-drilling device |
| 07/31/1991 | EP0438920A1 Dry pneumatic system for hard rock shaft drilling |
| 07/30/1991 | US5035292 Whipstock starter mill with pressure drop tattletale |
| 07/30/1991 | US5035291 Seafloor drilling apparatus |
| 07/30/1991 | US5035285 Electrically conductive |
| 07/30/1991 | CA1287043C Screen placement method and apparatus |
| 07/30/1991 | CA1287042C Method and apparatus for lateral drilling in oil and gas wells |
| 07/30/1991 | CA1286887C Sewer renovation |
| 07/24/1991 | EP0437895A1 Method for building foundation piles of concrete |
| 07/24/1991 | CN1053278A Well casing flotation device and method |
| 07/23/1991 | US5033907 Pipe alignment device |
| 07/23/1991 | US5033558 Well tool for use with down-hole drilling apparatus |
| 07/23/1991 | US5033556 Method and apparatus for horizontal drilling |
| 07/23/1991 | US5033554 Well point placement and removal apparatus |
| 07/23/1991 | CA2008417A1 Orientable adjustable bent sub |
| 07/23/1991 | CA1286601C Wellbore cleanout apparatus and method |
| 07/18/1991 | WO1991010805A1 Drilling tool for percussive and rotary drilling |