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)
06/1996
06/11/1996USRE35271 Pipe bursting and replacement apparatus
06/11/1996CA2071183C Whipstock setting method and apparatus
06/05/1996EP0715057A1 Lead pipe configuration for underground pipe laying
06/04/1996US5522461 Mill valve
06/04/1996CA2079071C Method and apparatus for drilling bore holes under pressure
06/03/1996CA2137201A1 Apparatus for drilling curved sections of well holes
05/1996
05/29/1996EP0713951A2 Method of drilling and completing wells
05/28/1996US5520256 Articulated directional drilling motor assembly
05/28/1996US5520255 Modulated bias unit for rotary drilling
05/28/1996US5520252 Method and apparatus for sealing the juncture between a vertical well and one or more horizontal wells
05/23/1996WO1996015352A1 Method and apparatus for forming a window in a subsurface well conduit
05/23/1996WO1996015350A1 Single-wire guidance system for drilling boreholes
05/21/1996US5517774 Earth boring rotary tool with axial feed
05/17/1996WO1996014491A1 Solenoid guide system for horizontal boreholes
05/17/1996CA2202460A1 Solenoid guide system for horizontal boreholes
05/15/1996EP0711390A1 Underground pipe replacement technique
05/14/1996US5515931 Single-wire guidance system for drilling boreholes
05/09/1996WO1996003566A3 Improvements in or relating to drilling with gas liquid swirl generator hydrocyclone separation combustion thermal jet spallation
05/08/1996EP0710863A1 Installing cable-ducts
05/08/1996EP0710764A2 Directional drilling motor assembly
05/08/1996EP0515538B1 A down-the-hole drill tool for drilling in advance of a casing tube
05/07/1996US5513714 Stabilization devices for drill motors
05/07/1996US5513713 Steerable drillhead
05/07/1996US5513710 Solenoid guide system for horizontal boreholes
05/07/1996US5513706 Method for improving formation stability surrounding a deviated wellbore
05/01/1996EP0709541A2 Locating device for a boring ram
05/01/1996CN1121553A Bit segments for a ground drill bit
04/1996
04/30/1996US5511627 Downhole stabiliser
04/30/1996US5511626 Hydraulically operated subsoil displacement apparatus
04/25/1996WO1996012083A1 Pressure converter iii
04/25/1996WO1996012082A1 Pressure converter
04/25/1996WO1996012081A1 Pressure converter
04/24/1996EP0502084B1 Device for steering the foremost part of a drill pipe
04/19/1996CA2128252A1 Automatic drilling machine
04/18/1996WO1996011322A1 No load derrick for drilling rig
04/18/1996DE19538215A1 Pipeline renovation device
04/16/1996US5507597 Underground pipe replacement method
04/16/1996US5507346 Composite well flow conductor
04/16/1996US5507107 Hoisting boom assembly
04/11/1996DE4432710C1 Underground horizon boring tool with directional control
04/10/1996EP0705947A1 Device for the replacement of tubes, in particular sewage tubes
04/10/1996CN2224272Y Hot-water driller for glacier drilling
04/10/1996CN2224271Y Multifunction combine driller
04/09/1996US5505558 Underground horizontal pipe installation method and apparatus
04/09/1996US5505262 Fluid flow acceleration and pulsation generation apparatus
04/04/1996DE4435048A1 Repairing buried pipes or ducts
04/04/1996DE19509135C1 Method of stope drilling for quarry blasting
04/03/1996CN1031473C Successive hole boring machine
04/02/1996US5503236 For drilling a borehole in subterranean formations
04/02/1996US5503235 Directional drilling control method
04/02/1996US5503031 Ground water sampling device
03/1996
03/28/1996WO1996009460A2 Apparatus for milling a well casing
03/28/1996DE4432115A1 Repair system for damaged drain lines in refuse dumps
03/27/1996EP0703345A2 Boring ram
03/27/1996EP0702746A1 System for in situ replacement of cutting means for a ground drill
03/26/1996US5501281 Torque-resistant, seal setting force-limited, hydraulically settable well packer structure and associated methods
03/20/1996CN2222794Y Parallel positioning soil boring machine
03/20/1996CN2222793Y Large desert shallow hole drilling tool for petroleum geophysical prospecting
03/20/1996CN1031335C Method and system for conducting offshore well operations
03/19/1996US5499682 Method for setting a slotted face wellbore deviation assembly using a rectilinear setting tool
03/19/1996US5499681 Centralizing liner hanger method and system for subterranean multilateral well drilling
03/19/1996US5499680 Diverter, diverter retrieving and running tool and method for running and retrieving a diverter
03/14/1996DE4432116A1 Pipe expander for widening, crushing and compressing old underground pipes
03/13/1996EP0701045A2 Multilateral well drilling and completion method and apparatus
03/13/1996EP0701044A2 Apparatus and method for hanging a downhole liner
03/13/1996EP0701043A2 Torque-resistant well packer
03/13/1996EP0701042A2 Decentring method and apparatus, especially for multilateral wells
03/13/1996EP0701041A2 Well flow conductor and manufacture thereof
03/13/1996EP0701040A2 Downhole diverter and retrieving tool therefor
03/12/1996US5497840 Process for completing a well
03/12/1996US5497714 Planting hole digger
03/07/1996WO1996007014A1 Arrangement for mounting swing cylinders in boom for rock drilling unit
03/07/1996WO1996007013A1 Arrangement in boom for rock drilling unit
03/07/1996WO1996007012A1 Arrangement for controlling boom for rock drilling unit
03/07/1996DE4431229A1 Anordnung zum Niederbringen einer Tiefbohrung mit einem hydrostatischen Abkopplungselement Arrangement for sinking a deep borehole with a hydrostatic decoupling element
03/07/1996DE4430874A1 Ground e.g. soil sample core acquisition using esp. small-bore techniques
03/06/1996EP0699823A1 Earth dumping control device for a small diameter pipe propelling machine
03/05/1996US5495903 Pulsation nozzle, for self-excited oscillation of a drilling fluid jet stream
03/05/1996US5495901 Surface adjustable adjustable bent housing
03/05/1996US5495900 Drill string deflection sub
02/1996
02/29/1996DE4430297A1 Drilling method using flushing water
02/27/1996US5495174 Method and apparatus for detecting boundary stratum and adjusting the direction of drilling to maintain the drill string within a bed of interest
02/27/1996US5494124 Negative pressure vortex nozzle
02/27/1996US5494111 Permanent whipstock
02/27/1996CA2156983A1 Centralizing liner hanger method and system for subterranean multilateral well drilling
02/27/1996CA2156981A1 Composite well flow conductor for subterranean multilateral well drilling and completion and method of manufacture therefor
02/22/1996WO1996005410A1 A drilling apparatus
02/22/1996WO1996005402A1 Direction controllable subsurface borehole tool
02/22/1996CA2173585A1 Direction controllable subsurface borehole tool
02/21/1996EP0546135B1 Device for adjusting the path azimuth of a rotary drilling tool
02/21/1996CN1117304A Ground boring device and method for constructing an underground wall using the same
02/20/1996US5492184 Earth boring device
02/15/1996WO1996004456A1 A drilling apparatus
02/14/1996EP0565679B1 Method for the replacement of, in particular, sewage pipes, and a device for carrying out the method
02/14/1996CN2219957Y Hanging device for whipstock
02/14/1996CN1031007C Hole opener for the top hole section of oil/gas wells
02/13/1996US5490569 Directional boring head with deflection shoe and method of boring
02/13/1996US5490568 Tractor-mounted stake driver
02/08/1996WO1996003606A1 Connection coupling for a traction device for laying cables or the like
02/08/1996WO1996003566A2 Improvements in or relating to drilling with gas liquid swirl generator hydrocyclone separation combustion thermal jet spallation
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