| Patents for E21B 4 - Drives for drilling, used in the borehole (6,032) |
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| 06/07/2001 | WO2001040622A1 Downhole pulser |
| 06/07/2001 | WO2001040616A1 Controlling the flow of driving fluid to a system of multiple hydraulic motors |
| 06/07/2001 | WO2001040615A1 Downhole device |
| 06/07/2001 | WO2001040613A2 Reciprocating rotary drilling motor |
| 06/07/2001 | DE19955345A1 Bohrkopf mit Energieerzeugungsvorrichtung Drilling head with energy generating device |
| 06/05/2001 | US6242829 Submersible pumping system utilizing a motor protector having a metal bellows |
| 06/05/2001 | US6241494 Non-elastomeric stator and downhole drilling motors incorporating same |
| 06/05/2001 | US6241031 Electro-hydraulically controlled tractor |
| 06/05/2001 | US6241029 Earth formation surveying device |
| 05/31/2001 | WO2001038689A1 Device for manipulating a tool in a well tubular |
| 05/30/2001 | CN1297098A High-pressure water jet controllable spin drill bit |
| 05/29/2001 | US6237704 Backhead and check valve for down-hole drills |
| 05/25/2001 | WO2001036781A2 Drill head with a power generation device |
| 05/25/2001 | WO2000046481B1 Downhole tractor |
| 05/23/2001 | EP1101013A1 Reverse circulation drilling system with bit locked underreamer arms |
| 05/15/2001 | US6230826 Drilling apparatus an excavation bit |
| 05/15/2001 | US6230823 Downhole motor |
| 05/15/2001 | US6230813 Method of moving a puller-thruster downhole tool |
| 05/15/2001 | CA2009734C Device in impact machines |
| 05/10/2001 | DE19960510C1 Ramming device; has cylindrical casing for hydraulic impact piston and closure part screwed onto rear end of casing having connection part with contour element for hydraulic connection |
| 05/09/2001 | EP1098066A1 Tunnel boring machine |
| 05/08/2001 | US6227547 High pressure rotary shaft sealing mechanism |
| 05/08/2001 | US6227313 Anti-torque tool |
| 05/03/2001 | WO2001031160A1 Method and apparatus for operations in underground/subsea oil and gas wells |
| 05/03/2001 | WO2000057543A8 High frequency switch-mode dc powered computer system |
| 04/17/2001 | US6217260 Downhole reamer with double acting dual piston cylinder |
| 04/12/2001 | WO2000052294A3 Drill head for directional boring |
| 04/10/2001 | US6213229 Drilling motor drill bit reaming stabilizer |
| 04/04/2001 | EP1088151A1 Downhole milling device |
| 04/04/2001 | EP1088149A1 Percussive down-the-hole rock drilling hammer, and a piston used therein |
| 04/03/2001 | US6209666 Percussive down-the-hole hammer and a piston and drill bit therefor |
| 04/03/2001 | US6209665 Reverse circulation drilling system with bit locked underreamer arms |
| 04/03/2001 | CA2025898C Down-hole mud actuated hammer |
| 03/29/2001 | WO2001021930A1 Drilling apparatus |
| 03/28/2001 | CN2425195Y Power swivel of hydraulic top drive drilling unit |
| 03/27/2001 | US6206112 Multiple lateral hydraulic drilling apparatus and method |
| 03/22/2001 | WO2001020119A1 An apparatus and method for rotating a portion of a drill string |
| 03/22/2001 | DE19950599A1 Drill for making holes for piles has drilling screw with cutter bit at end, hammer drill being mounted in hollow central tube of drilling screw which has air cushioning system to protect it against effect of drilling screw |
| 03/20/2001 | US6202762 Flow restrictor valve for a downhole drilling assembly |
| 03/06/2001 | US6196766 Apparatus for movement along an underground passage and method using same |
| 03/06/2001 | US6196336 Method and apparatus for drilling boreholes in earth formations (drilling liner systems) |
| 02/22/2001 | DE19939000A1 Hydraulic hammer drill has a deflection unit with a twisting flow channel at the hydraulic pressure inflow or the return line to reduce pressure swings and/or pressure bursts |
| 02/21/2001 | EP1076754A1 Pneumatic submersible boring tool |
| 02/20/2001 | US6189630 Downhole hammer-type core barrel |
| 02/15/2001 | WO2001011180A1 Continuous wellbore drilling system with stationary sensor measurements |
| 02/15/2001 | WO2001011179A1 A drilling device |
| 02/15/2001 | WO2000046481A3 Downhole tractor |
| 02/14/2001 | EP1076153A1 Gear reducer for slow rotating downhole tool |
| 02/14/2001 | EP1075586A1 Jet cleaning apparatus |
| 02/08/2001 | WO2001009478A1 Long reach rotary drilling assembly |
| 02/06/2001 | US6183226 Progressive cavity motors using composite materials |
| 02/06/2001 | US6182776 Overburden drilling apparatus having a down-the-hole hammer separatable from an outer casing/drill bit unit |
| 02/01/2001 | WO2001007749A1 Lockable motor assembly for use in a well bore |
| 01/31/2001 | EP0920566B1 Rotary-percussion drill apparatus and method |
| 01/30/2001 | US6179055 Conveying a tool along a non-vertical well |
| 01/18/2001 | WO2001004451A1 Downhole motor |
| 01/16/2001 | US6173794 Downhole mud motor transmission |
| 01/09/2001 | US6170581 Backhead and check valve for down-hole drills |
| 01/03/2001 | CN2413012Y Jet-suction valve impactor |
| 01/03/2001 | CN2413011Y Floating rotor turbne mud motor |
| 01/02/2001 | US6167968 Method and apparatus for radially drilling through well casing and formation |
| 12/28/2000 | WO2000079146A1 High capacity thrust bearing |
| 12/28/2000 | WO2000079091A1 Piloted drill barrel and method of using same |
| 12/28/2000 | CA2376334A1 High capacity thrust bearing |
| 12/26/2000 | US6164393 Impact tool |
| 12/19/2000 | US6161631 Environmentally friendly horizontal boring system |
| 12/14/2000 | WO2000075476A1 Method of creating a wellbore |
| 12/13/2000 | CN2410408Y Borehole power drilling tool with balancing drum |
| 12/13/2000 | CN1276853A Downhole roller vane motor and roller vane pump |
| 12/05/2000 | US6155361 Hydraulic in-the-hole percussion rock drill |
| 11/30/2000 | WO2000071914A1 High pressure rotary shaft sealing mechanism |
| 11/30/2000 | CA2374592A1 High pressure rotary shaft sealing mechanism |
| 11/28/2000 | US6152222 Hydraulic device to be connected in a pipe string |
| 11/28/2000 | US6151962 Portable tester for downhole motors |
| 11/28/2000 | CA2079605C Hammer device |
| 11/22/2000 | EP0960254A4 Reverse circulation drilling system with bit locked underreamer arms |
| 11/21/2000 | US6148934 Coupling piece for use at simultaneous earth and/or rock drilling with an upper rotary percussion device and a lower percussion device |
| 11/15/2000 | EP1051560A1 Downhole motor assembly |
| 11/08/2000 | EP0687340B1 Pressure reversing valve for percussive drilling apparatus |
| 11/08/2000 | EP0682737B1 Reversible casing for a down-the-hole percussive apparatus |
| 11/07/2000 | US6142246 Multiple lateral hydraulic drilling apparatus and method |
| 11/07/2000 | US6142245 Extended reach drilling system |
| 11/07/2000 | US6142244 Percussion boring machine with run monitoring |
| 11/07/2000 | US6142228 Downhole motor speed measurement method |
| 10/31/2000 | US6138775 Boring machine |
| 10/24/2000 | US6135216 Venting and sealing system for down-hole drills |
| 10/19/2000 | WO2000061916A1 Three-dimensional steering tool for controlled downhole extended-reach directional drilling |
| 10/17/2000 | US6131672 Percussive down-the-hole rock drilling hammer and piston therefor |
| 10/11/2000 | EP0657006B1 Guided mole |
| 10/11/2000 | CN1057363C Hydraulic extruding-expanding device |
| 10/10/2000 | US6129160 Torque compensation apparatus for bottomhole assembly |
| 10/10/2000 | CA2159904C Percussion drilling improvements |
| 10/04/2000 | EP1040275A2 Method of making stators for moineau pumps |
| 10/04/2000 | EP1040231A1 Soil consolidation apparatus, tool and method |
| 10/03/2000 | US6125952 Percussive down-the-hole hammer and a drill bit therefor |
| 09/28/2000 | WO2000057543A1 High frequency switch-mode dc powered computer system |
| 09/28/2000 | WO2000056478A1 Portable torque tester for downhole motors |
| 09/28/2000 | CA2368175A1 Portable torque tester for downhole motors |
| 09/27/2000 | EP1038086A1 Percussive tool |
| 09/27/2000 | CN1056899C Reversible casing for a down-the hole percussive apparatus |