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 4 - Drives for drilling, used in the borehole
Patents for E21B 4 - Drives for drilling, used in the borehole (6,032)
11/1999
11/30/1999US5992537 Back end connection in a downhole drill
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
11/23/1999US5988272 Apparatus and method for milling a well casing
11/18/1999DE19821867A1 Downhole deep drilling motor based on eccentric mono-pump principle
11/16/1999US5984021 Porting system for back chamber of pneumatic hammer
11/15/1999CA2271647A1 Machine operating according to the moineau principle, especially a drill motor for deep drilling
11/11/1999WO1999057416A1 Jet cleaning apparatus
11/11/1999WO1999057412A1 Down-hole hammer drill having reverse circulation and sample tube
11/11/1999WO1999057411A1 Pneumatic submersible boring tool
11/10/1999EP0955443A1 Moling Apparatus
11/10/1999CN1234471A All-intelligent multifunctional hydraulic extruding extender
11/03/1999EP0845070B1 Scraper for removing an earth core from a pipe laid without excavation
11/03/1999CN1234092A Rotary-percussion drill apparatus and method
11/02/1999US5975222 Reverse circulation drilling system with bit locked underreamer arms
10/1999
10/27/1999EP0951611A1 Wellbore tractor
10/14/1999WO1999041483A9 High torque, low speed mud motor for use in drilling oil and gas wells
10/05/1999US5960892 Automatically driven pile driver drilling device
09/1999
09/30/1999DE19830428A1 Positive engagement connection between tube and ring inserted in it
09/28/1999US5957226 Reverse circulation drilling system with hexagonal pipe coupling
09/28/1999US5957220 Percussion drill assembly
09/22/1999EP0708864B1 Apparatus and method for imparting additional momentum to a moving body
09/21/1999US5954145 Reversible percussion piston drill apparatus
09/21/1999US5954131 Method and apparatus for conveying a logging tool through an earth formation
09/21/1999CA2136559C Bottom hole drilling assembly
09/10/1999WO1999045237A1 An arrangement for drilling slots
09/07/1999US5947213 In a well bore
09/02/1999WO1999031389A3 Method of making stators for moineau pumps
09/02/1999WO1999027223A3 Method and apparatus for injecting coil tubing down pipelines
08/1999
08/31/1999US5944117 Fluid actuated impact tool
08/19/1999WO1999041483A1 High torque, low speed mud motor for use in drilling oil and gas wells
08/19/1999DE19804919A1 Percussion boring machine with hard contacting surfaces, for production of bore holes in the ground, e.t.c.
08/19/1999CA2320280A1 High torque, low speed mud motor for use in drilling oil and gas wells
08/18/1999EP0640170B1 Improved drilling arrangement
08/17/1999US5937956 Ram boring machine
08/17/1999CA2153144C Downhole roller vane motor and roller vane pump
08/10/1999US5934386 Small diameter impact boring tool impact head
08/05/1999WO1999039074A1 Downhole motor assembly
08/03/1999US5931243 Hammer device
08/02/1999CA2260547A1 A percussive down-the-hole hammer and a drill bit
07/1999
07/20/1999US5924500 Steerable boring machine
07/14/1999EP0928876A1 Device for drilling a bore hole in the ground
07/08/1999WO1999034085A1 Combined rotation drill
07/07/1999EP0927294A1 Coupling piece for use at simultaneous earth and/or rock drilling with an upper rotary percussion device and a lower percussion device
07/06/1999US5918690 Bottom rotation shaft actuator
07/06/1999US5918687 Apparatus for forming a hole in soil
07/01/1999WO1999009291A9 Method and apparatus for moving a piston
06/1999
06/30/1999CN1221468A Hydraulic device to be connected in pipe string
06/29/1999US5915483 Down the hole drill
06/24/1999WO1999031389A2 Method of making stators for moineau pumps
06/17/1999WO1999029996A1 Percussive tool
06/16/1999EP0692062B1 Down-hole hammer drill having reverse circulation and drill bit for the hammer drill
06/15/1999US5911284 Downhole mud motor
06/10/1999WO1999028586A1 Top-sub assembly of a downhole hammer
06/09/1999EP0920566A1 Rotary-percussion drill apparatus and method
06/09/1999EP0847477A4 Drill bit with set of underreamer arms
06/03/1999WO1999027254A1 Progressive cavity motors using composite materials
06/03/1999WO1999027223A2 Method and apparatus for injecting coil tubing down pipelines
06/03/1999WO1999027192A1 Soil consolidation apparatus, tool and method
05/1999
05/19/1999EP0916770A2 Securing means for elastic material
05/18/1999US5904444 Propelling apparatus for underground propelling construction work
05/12/1999EP0752046B1 Stabilisation devices for drill motors
05/11/1999US5901799 Connection for first and second members
05/05/1999CN1215789A Well system
04/1999
04/29/1999WO1999020904A1 Downhole roller vane motor and roller vane pump
04/29/1999CA2306622A1 Downhole roller vane motor and roller vane pump
04/28/1999EP0911483A2 Well system including composite pipes and a downhole propulsion system
04/28/1999EP0745175B1 Process for removing the core of earth from a pipe laid without excavation and scraper for implementing said process
04/22/1999WO1999019594A1 Oil tool
04/21/1999CN2315285Y Hydraulic transverse drilling machine
04/15/1999WO1999018324A1 Hammer
04/07/1999EP0737268B1 Control device for drilling a bore hole
04/07/1999CN1213423A Device for drilling bore hole in the ground
03/1999
03/30/1999USRE36166 Air percussion drilling assembly for directional drilling applications
03/23/1999US5884716 Constant bottom contact thruster
03/17/1999EP0901562A1 Downhole apparatus
03/17/1999EP0901561A1 A hydraulic device to be connected in a pipe string
03/17/1999CN2310855Y Quick drilling device
03/17/1999CN1210934A Method and apparatus for conveying logging tool through earth formation
03/16/1999US5881827 Extendable bit
03/10/1999EP0900914A2 Method and apparatus for conveying a logging tool through an earth formation
03/02/1999US5875859 Device for controlling the drilling direction of drill bit
02/1999
02/25/1999WO1999009291A1 Method and apparatus for moving a piston
02/25/1999WO1999009290A1 Drilling system with means for anchoring in the borehole
02/25/1999CA2300087A1 Method and apparatus for moving a piston
02/24/1999EP0897478A1 Bending rod connection
02/24/1999EP0897453A1 Hammer device
02/02/1999CA2002135C Directional drilling apparatus and method
01/1999
01/12/1999US5857531 For connection to a drill string for drilling wells at build-up rates
01/07/1999WO1999000576A1 Downhole mud motor
01/07/1999EP0889195A2 Downhole hammer
01/06/1999CN1204378A Fluid drilling system
01/02/1999CA2238785A1 Down-the-hole drilling machine
12/1998
12/30/1998WO1998059146A1 Earth formation surveying device
12/30/1998EP0886714A1 Device for drilling a bore hole in the ground
12/29/1998US5853053 Stabilization devices for drill motors
12/29/1998US5853052 Hydraulic drive for rotation of a rock drill
12/23/1998EP0885694A1 Hydraulic hammer having improved seal ring
12/22/1998USRE36002 Transmission sleeve for a down hole hammer
12/16/1998EP0884446A2 Drilling apparatus
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