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)
01/1992
01/15/1992EP0465864A1 Drill hammer control valve
01/15/1992CN1057882A Composite installation for turning borer of over footage and rebounding with obsorption and vibration
01/14/1992US5080179 Down the hole hammer equipment
01/07/1992US5078650 Universal joint arrangement for downhole tools
01/07/1992US5078218 Steerable drilling mole
01/02/1992EP0463198A1 Soil drilling equipment
01/02/1992EP0406411A4 Down-hole mud actuated hammer
12/1991
12/31/1991US5076392 Method and apparatus for forcing a member through material such as soil and obtaining samples therefrom
12/27/1991EP0462821A2 Swivel assembly for a pneumatic underground piercing tool
12/24/1991US5074681 Downhole motor and bearing assembly
12/24/1991US5074364 Ram boring machine
12/21/1991CA2044996A1 Hermetically sealed progressive cavity drive train for use in downhole drilling
12/21/1991CA2044943A1 Downhole drilling apparatus progressive cavity drive train with sealed coupling
12/21/1991CA2044942A1 Progressive cavity drive train with elastomeric joint assembly for use in downhole drilling
12/12/1991WO1991019072A1 Downhole fluid motor composite torque shaft
12/11/1991CN2090414U Boring machine
12/07/1991WO1991019073A1 Soil displacement hammer with reversing mechanism
12/07/1991CA2084650A1 Soil displacement hammer with reversing mechanism
12/03/1991US5069298 Well drilling assembly
12/01/1991CA2018060A1 Device for drilling holes in the ground
11/1991
11/27/1991EP0457925A1 Working organ of helical-type down-hole drive for hole drilling
11/26/1991US5068554 Electric motor
11/26/1991US5067874 Compressive seal and pressure control arrangements for downhole tools
11/19/1991US5065827 Hammer bit retention tool
11/19/1991US5065823 Extraction device for pneumatically actuated drilling tools
11/13/1991EP0455994A2 Eccentric drive for radially oscillating rollers, rolling cutters and milling drilling tools
11/13/1991EP0232421B1 Screw machine
11/12/1991US5064002 Concentric drill rod assemblies for percussion rock drills
11/06/1991EP0454947A1 Boring ram
10/1991
10/31/1991WO1991016520A1 A borehole, as well as a method and an apparatus for forming it
10/30/1991CN1055792A Through type in the hole drill reversing circulation core bit
10/29/1991US5060737 Drilling system
10/29/1991US5060736 Steerable tool underreaming system
10/22/1991CA1290952C Downhole motor drive shaft universal joint assembly
10/15/1991US5056609 Valve assembly for a downhole to remove bore hole subsidence
10/15/1991US5056608 Boring ram
10/15/1991US5056269 Apparatus for working in pipes
10/12/1991WO1991015652A1 Hammer device
10/09/1991EP0450056A1 Progressive cavity drive train
10/02/1991EP0303635B1 System with a hydraulic lifting generator for earth drilling
10/01/1991US5052502 Apparatus for directional coring
09/1991
09/25/1991EP0447837A2 Process and device for controlling a ram installation
09/24/1991US5050686 Percussion drill
09/17/1991US5048981 Modular drop-in sealed bearing assembly for downhole drilling motors
09/17/1991US5048622 Hermetically sealed progressive cavity drive train for use in downhole drilling
09/11/1991CN1054470A High pressure downhole progressive cavity drilling apparatus with lubricating flow restrictor
09/04/1991CN1013785B Drill-hole device with hydraulic impacting generator
09/03/1991WO1991012987A1 Self propelled probe, particularly for penetrating a powdered material
09/03/1991CA2055461A1 Self-propelled probe, particularly for penetrating pulverulent materials
08/1991
08/22/1991WO1991012405A1 Pneumopercussive soil penetrating machine
08/14/1991EP0441172A2 Boring ram
08/13/1991USRE33660 Apparatus for drilling a curved borehole
08/13/1991US5038874 Drill bit having a flushing medium channel
08/13/1991US5038873 Drilling tool with retractable pilot drilling unit
08/08/1991WO1991011646A1 Utility tunneling method and apparatus
08/07/1991EP0439600A1 Drill.
08/06/1991US5037212 Bearing structure for downhole motors
07/1991
07/24/1991EP0264444B1 Downhole screw motor
07/18/1991DE4000691A1 Eccentric deep hammer drill - consists of asymmetrical casing for eccentric drill activated by piston
07/16/1991US5031706 Pneumopercussive soil penetrating machine
07/10/1991CN1052922A Hybrid pneumatic percussion rock drill
07/09/1991US5029655 Drilling machine for drilling large drilling holes in rock, particularly underground
07/09/1991US5029653 Sinking drill holes in underground rock
07/03/1991CN2080099U Plunger slide valve high efficienty pneumatic impact mechanism
07/02/1991CA1285551C Flow pulsing apparatus with axially movable valve
07/02/1991CA1285550C Core drilling tool for boreholes in rock
06/1991
06/27/1991WO1991010038A1 Hybrid pneumatic percussion rock drill
06/27/1991WO1991009201A1 Working organ of helical-type down-hole drive for hole drilling
06/25/1991US5025868 Pneumatic ground piercing tool
06/23/1991WO1991010067A1 Progressive cavity drilling apparatus with flow restrictor
06/23/1991CA2046899A1 High pressure downhole progressive cavity drilling apparatus with lubricating flow restrictor
06/20/1991DE3939219A1 Toothed roller bit for earth and rock drilling - consists of eccentric roller bit attached to main body of drill
06/13/1991WO1991008369A1 Turbo-drill
06/11/1991US5022474 Multiple blow percussion drill assembly with rapid field maintenance and adjustment capability
06/11/1991US5022471 Deviated wellbore drilling system and apparatus
06/05/1991EP0429765A2 Directional drilling tool
06/04/1991US5020599 Drilling tool
05/1991
05/31/1991CA2031093A1 Directional drilling tool
05/29/1991DE3938749A1 Drill turbine for deep boring has housing for coupling to drill pipe - and rotor driven by flushing fluid and coupled to drill bit, in unit having short length and high efficiency
05/29/1991CN1012673B Power-driven tool
05/28/1991US5018590 Electromagnetic drilling apparatus
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
05/14/1991US5014796 Down hole drills using spent driving fluid for flushing purposes
05/08/1991DE3936730A1 Direct drive for chisels to reduce motor revolutions - comprises shafts coupled to crankshafts coupled to hollow sleeve driven by rings and crank pins
04/1991
04/30/1991US5010965 Self-propelled ram boring machine
04/18/1991WO1991005132A1 Reamer
04/16/1991US5007491 Downhole drilling apparatus progressive cavity drive train with sealed coupling
04/16/1991US5007490 Progressive cavity drive train with elastomeric joint assembly for use in downhole drilling
04/12/1991WO1991005939A1 Progressive cavity drive train
04/12/1991CA2044136A1 Progressive cavity drive train
04/09/1991US5005656 Device in impact machines
04/02/1991US5004056 Percussion-rotary drilling tool
04/02/1991CA1282449C Bearing assembly
04/02/1991CA1282448C Friction bearing for deep well drilling tools
03/1991
03/27/1991EP0418402A1 Device for making holes in the ground
03/26/1991US5002138 Steerable drilling mole
03/26/1991CA1282053C Borehole drill construction
03/19/1991US5000723 Universal joint for downhole motors
03/07/1991WO1991002881A1 Device for deep ground consolidation
1 ... 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 ... 61