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)
12/1999
12/01/1999EP0960260A1 Tool for making an opening in a tubular in a wellbore
12/01/1999EP0740737A4 Method and apparatus for plasma blasting
12/01/1999CN1237222A Process and device for simultaneously drilling and lining hole
12/01/1999CN1046981C Devices and method to stop water inflow to underground pipe laying work area
11/1999
11/30/1999US5992525 Apparatus and methods for deploying tools in multilateral wells
11/30/1999US5992524 Method for isolating multi-lateral well completions while maintaining selective drainhole re-entry access
11/30/1999CA2154213C Blasthole drill with improved automatic breakout wrench
11/28/1999CA2443312A1 Expandable wellbore junction
11/25/1999WO1999060244A1 Multiple lateral hydraulic drilling apparatus and method
11/24/1999EP0958446A2 Method and device for driving bore-holes, specially for prospection and extraction drillings
11/24/1999CN1236414A Method and apparatus for attaching a casing to a drill bit in overburden drilling equipment
11/24/1999CN1046783C System for insitu replacement of cutting means for a ground drill
11/23/1999CA2192692C Transmission line installation
11/18/1999WO1999058812A1 Device relating to a boring assembly
11/18/1999WO1999058807A1 Guide device
11/18/1999WO1999035365A3 Downhole pressure intensifier for jet cutting
11/18/1999DE19829667C1 Method of changing buried pipeline
11/17/1999EP0956424A2 Method and device for driving bore holes, specially exploring and extraction drillings in the sea bottom
11/16/1999US5984583 Methods and apparatus for directionally drilling a bore and placing pipe
11/16/1999US5984026 Pressure converter
11/16/1999CA2271630A1 Pile and method for installing same
11/16/1999CA2139183C Blasthole drill with drill-through pipe rack
11/16/1999CA2075968C Apparatus and method for building a foundation for upright or for making passages therethrough
11/11/1999WO1999057411A1 Pneumatic submersible boring tool
11/10/1999EP0955444A2 Method and apparatus for installing a house service connection using directional drilling
11/10/1999EP0955443A1 Moling Apparatus
11/10/1999EP0954674A1 Drilling assembly with a steering device for coiled-tubing operations
11/10/1999EP0954673A2 Apparatus for directing and steering the foremost part of a drillpipe at drillings
11/10/1999EP0750716B1 Milling tool
11/09/1999US5980157 Ground-boring machine
11/09/1999US5979574 Horizontal boring apparatus and method of using the same
11/09/1999US5979573 Horizontal boring apparatus
11/09/1999US5979571 Combination milling tool and drill bit
11/09/1999US5979570 Surface controlled wellbore directional steering tool
11/04/1999WO1999055998A1 Method and device for drilling a borehole in the ground
11/04/1999WO1999039073A3 Method and apparatus for running two tubing strings into a well
11/04/1999WO1998050667A3 Directional drilling apparatus
11/04/1999DE19649572C2 Bohrvorrichtung Drilling device
11/03/1999EP0953723A2 Enlarging apparatus
11/03/1999EP0952899A1 Device for trenchless replacement of underground pipe
11/03/1999EP0845070B1 Scraper for removing an earth core from a pipe laid without excavation
11/03/1999CN2346924Y Follow-drilling hydraulic oblique making appts.
11/02/1999US5975208 Method and apparatus for deploying a well tool into a lateral wellbore
10/1999
10/28/1999WO1999054586A1 Method and apparatus for rotary mining
10/28/1999DE19831190C1 Appliance for dividing subterranean pipes and laying of new ones etc.
10/28/1999DE19817873A1 Apparatus for the trench-less laying of pipe-work underground
10/28/1999DE19817872A1 Aufweitvorrichtung Expander
10/28/1999DE19814232C1 Production of ground bores and-or destruction of old pipe conduits underground
10/27/1999EP0952301A1 Method and apparatus for drilling an offshore underwater well
10/27/1999EP0952300A1 Method and apparatus for drilling a plurality of offshore underwater wells
10/27/1999CN2345675Y Cable duct drilling machine
10/27/1999CA2705595A1 Whipstock, running/retrieval tool and a system for tieing back a liner from a wellbore casing
10/27/1999CA2270264A1 Water pressure posthole digger
10/26/1999US5971085 Downhole unit for use in boreholes in a subsurface formation
10/26/1999US5971074 Methods of completing a subterranean well and associated apparatus
10/26/1999US5971073 Methods of completing a subterranean well and associated apparatus
10/20/1999EP0795074B1 Method and apparatus for drilling with high-pressure, reduced solid content liquid
10/19/1999US5967247 Steerable rotary drag bit with longitudinally variable gage aggressiveness
10/14/1999WO1999051850A2 Underground cable and pipelaying
10/14/1999WO1999051488A1 Trenchless replacement of underground piping
10/13/1999EP0948701A1 Process and device for simultaneously drilling and lining a hole
10/13/1999EP0948700A2 Whipstock
10/12/1999US5964307 Shock tool for use in directional drilling
10/12/1999US5964306 Auger earth boring machine with improved efficiency and safety
10/12/1999US5964303 Process and a device for establishing drilling holes
10/12/1999US5964297 Method of drilling in earth layers with a drill hammer
10/12/1999US5964287 To communicate well tools between a first and second wellbore
10/07/1999WO1999050528A1 Drillstring with stabilisers for re-entering a primary wellbore
10/07/1999WO1999050527A1 Riser tensioning construction
10/07/1999DE19814033A1 Guide assembly for a drill pipe
10/06/1999EP0947663A1 Apparatus for static earth boring
10/06/1999EP0690942B2 Process for sealing off ground sites and device for carrying out this process
10/05/1999US5961252 Underground utility installation tension monitoring arrangement and method
10/05/1999US5960873 Producing fluids from subterranean formations through lateral wells
10/05/1999CA2006927C Controlled path boring mountings with a variable angle elbow element and use thereof
09/1999
09/30/1999WO1999049178A1 A system and method for locating a tool in a wellbore, a tubular and a device for the system
09/30/1999DE19813087A1 Drilling device with tubular outer drill stem through which injection drill stem extends
09/29/1999EP0945587A1 Riser tensioning construction
09/29/1999EP0945586A2 Method and apparatus for forming a wellbore junction
09/28/1999US5957225 Drilling assembly and method of drilling for unstable and depleted formations
09/28/1999US5957224 Double bit assembly and method of using the same
09/28/1999US5957222 Directional drilling system
09/28/1999US5957221 Downhole core sampling and testing apparatus
09/28/1999CA2190658C Hinged drilling tool
09/27/1999CA2262243A1 Method and apparatus for drilling a plurality of offshore underwater wells
09/27/1999CA2262240A1 Method and apparatus for drilling an offshore underwater well
09/21/1999US5954146 System for in situ replacement of cutting means for a ground drill
09/21/1999US5954143 Remote controlled all-terrain drill unit
09/21/1999US5954134 Methods of completing a subterranean well and associated apparatus
09/21/1999US5954130 For use in a subterranean well casing
09/21/1999CA2136559C Bottom hole drilling assembly
09/20/1999CA2266198A1 Thruster responsive to drilling parameters
09/15/1999EP0942145A2 Torque resistent whipstock
09/15/1999CN1228824A System for directional control of drilling
09/14/1999US5950743 Method for horizontal directional drilling of rock formations
09/14/1999US5950741 Extended soil sampling head
09/14/1999US5950740 Soil sampling apparatus
09/14/1999US5950739 Earth piercing apparatus
09/14/1999US5950738 Inverted cone cutter attachment for ice auger
09/14/1999US5950736 Method and apparatus for improving drilling efficiency by application of a traveling wave to drilling fluid
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