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)
07/1991
07/18/1991DE4000691A1 Eccentric deep hammer drill - consists of asymmetrical casing for eccentric drill activated by piston
07/18/1991CA2074076A1 Drilling tool for percussive and rotary drilling
07/17/1991CN2080987U Forcedly guiding whipstock
07/17/1991CA2033806A1 Tubular footing form for building foundation piles of concrete
07/16/1991US5031707 Apparatus for making holes in soil
07/11/1991DE3943151A1 Underground pipe laying direction monitor - has transmitter and power supply mounted in casing on drilling bit at end of pipe
07/10/1991CN2080553U Auto-opening-and-closing, hanging-and-unhanging device for punch-grab type driller
07/09/1991US5029654 Bendable drilling sub
07/09/1991US5029653 Sinking drill holes in underground rock
07/09/1991US5029651 Post driver
07/05/1991CA2027919A1 Drill stem arrangement and method
07/03/1991EP0434924A1 Apparatus for drilling an offset or side-tracked well, especially from a cased well
07/02/1991US5027908 Bearing apparatus and method for preloading bearings for rotary-vibratory drills
06/1991
06/27/1991WO1991009182A1 Device for making holes in the ground
06/27/1991DE3942934A1 Underground pipeline replacing rig - is dragged through old pipe and shatters old pipe via shaped head
06/26/1991EP0434652A1 Rock drilling rig
06/26/1991EP0433407A1 Moling system.
06/26/1991CN2079656U Improved drill with punching, grabing awl head
06/25/1991CA1285265C Drilling boom
06/23/1991CA2033048A1 One trip window cutting tool method and apparatus
06/21/1991CA2031559A1 Rock drilling rig
06/20/1991WO1991009202A1 Drilling tool for widening a bore well
06/20/1991DE4036721A1 Drilling or driving holes in cave walls or floors - involves use of drill rod and head inside associated tube and sealing free end
06/20/1991DE4035646A1 Driving support into ground - involves H=section member with drill auger in each recess
06/19/1991CN1052349A Multiple functional treatment agent for well drill liquid and its preparing method
06/16/1991WO1991009203A1 Downhole drill bit and bit coupling
06/16/1991CA2070634A1 Downhole drill bit and bit coupling
06/13/1991WO1991008370A2 Device for steering the foremost part of a drill pipe
06/13/1991WO1991008353A1 Method for correcting the deviation of a hole from required direction during advancement of a hole-making device and device for making holes in the ground
06/13/1991CA2067802A1 Device for steering the foremost part of a drill pipe
06/12/1991EP0431039A1 A device for boring holes in the ground.
06/11/1991US5022471 Deviated wellbore drilling system and apparatus
06/11/1991US5022470 Autonomous rapid thermal ice penetrating method and system
06/11/1991US5022262 Process and apparatus for determining the erodability of soil, in particular soil belonging to the underwater floor
06/05/1991EP0429765A2 Directional drilling tool
06/04/1991US5020608 Device for boring holes in the ground
06/02/1991WO1991008371A1 Drilling bit irrigated by a fluid distributed by a fluidic oscillator
06/02/1991CA2069953A1 Drilling tool with irrigation system using a fluid distributed by a fluidic oscillator
06/01/1991CA2004438A1 Method of downhole hydraulicking mineral resources
05/1991
05/31/1991CA2031093A1 Directional drilling tool
05/30/1991WO1991007566A1 Converter
05/30/1991WO1991007548A1 Device for making holes in the ground
05/30/1991CA2073017A1 Converter
05/29/1991EP0429254A2 Drilling a bore hole in the earth
05/29/1991EP0429130A1 Drill point and ground drilling device.
05/29/1991DE3938765A1 Drainage pipe renewal process - uses driving tube surrounding old pipe and fitted with guide body
05/28/1991US5018588 Anchor drilling implement
05/22/1991EP0428181A1 Percussion tool for drilling holes in the soil
05/22/1991EP0428180A1 Control system for guiding boring tools and a sensing system for locating the same
05/21/1991US5016717 Vacuum excavator
05/16/1991WO1991006742A1 Method and device for thermogasodynamic drilling of ground
05/15/1991EP0427663A1 Hydraulic drilling device and method for use
05/15/1991EP0427437A1 Apparatus for altering the length of a downhole tool assembly
05/15/1991EP0426788A1 High-pressure pipe string for continuous fusion drilling of deep wells, process and device for manufacturing, propelling and dismantling it.
05/14/1991US5015124 Apparatus for directing forward movement of a rod
05/14/1991US5014795 Percent grade boring and monitoring apparatus
05/09/1991CA2029094A1 Hydraulic drilling outfit
05/08/1991EP0425782A1 Pipe connection for a drill string
05/08/1991EP0353309A4 Method of constructing a well
05/07/1991US5013880 Process for welding a follower pipe to a buried pipe string
05/07/1991US5013191 Cast-in-place piling method and apparatus
05/07/1991US5013189 Intermediate pipe-jacking apparatus
05/07/1991US5013188 Process for replacing a length of buried pipe
05/07/1991US5012877 Apparatus for deflecting a drill string
05/07/1991US5012875 Method and apparatus for protecting a shallow-water well
05/02/1991WO1991005919A1 Device for making holes in the ground
05/02/1991EP0424779A1 Self-propelled equipment to bore in tunnels
05/02/1991EP0424768A1 Device to feed reinforcement rods
05/02/1991EP0424733A1 Device to load reinforcement rods
05/01/1991CN2076151U Bit direction changing device controlled with drilling fluid
04/1991
04/30/1991US5010965 Self-propelled ram boring machine
04/26/1991WO1991006798A1 Method for the mounting of underground pipelines
04/26/1991CA2070417A1 Method for the mounting of underground pipelines
04/23/1991US5009274 Laterally adjustable drilling tool
04/23/1991US5009273 Deflection apparatus
04/23/1991US5009272 Flow pulsing method and apparatus for drill string
04/23/1991US5009271 Drill assembly
04/18/1991WO1991005141A1 Tunnel drilling apparatus and method to remove drill waste
04/18/1991WO1991005132A1 Reamer
04/18/1991DE3933634A1 Power supply controller for loader and drill wagon - implements sequential switching of circuits for monitoring different machine functions independently using single power supply cable
04/18/1991CA2066051A1 Tunnel drilling apparatus and method to remove drill waste
04/16/1991US5007492 Safety stabilizer for auger
04/16/1991CA2001180A1 Post hole digger
04/10/1991CN2074810U Well top sleeve corrector
04/09/1991US5005656 Device in impact machines
04/04/1991WO1991004391A1 Method and apparatus for drilling
04/02/1991US5004057 Drill bit with improved steerability
04/02/1991US5004055 Vibratory core drill apparatus for the recovery of soil or sediment core samples
03/1991
03/28/1991WO1991005140A1 Drilling apparatus and method for its control
03/28/1991WO1991005138A1 Control method and control equipment for drilling apparatus
03/28/1991WO1991005137A1 Method and apparatus for drilling a tunnel
03/28/1991DE3931293A1 Air sample extractor for measuring harmful material concn. in earth - has measuring arrangement connected to suction tube inside hollow conical probe of steel with air openings
03/28/1991CA2066238A1 Method and apparatus for drilling a tunnel
03/28/1991CA2066217A1 Control method and control equipment for drilling apparatus
03/28/1991CA2066168A1 Drilling apparatus and method for its control
03/27/1991EP0418720A1 Method for renewing catch water drains in garbage dumps, and device to realize the method
03/27/1991EP0418402A1 Device for making holes in the ground
03/27/1991CN2073928U Adjustable type stabilizer reverse double-elbow screw drilling tool stabilizer
03/27/1991CN1012189B Well completion process using polymer gel
03/26/1991US5002435 Device for making cast-in-situ piles using a continuous hollow auger
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