| Patents for E21B 7 - Special methods or apparatus for drilling (22,064) |
|---|
| 05/19/1999 | CN1217041A Underwater installation and method for building same |
| 05/18/1999 | US5904444 Propelling apparatus for underground propelling construction work |
| 05/18/1999 | US5904210 Apparatus and method for detecting a location and an orientation of an underground boring tool |
| 05/14/1999 | WO1999023345A2 Mill for use in a wellbore and method of milling |
| 05/12/1999 | EP0752046B1 Stabilisation devices for drill motors |
| 05/12/1999 | DE19749409A1 Special drilling process and corresponding drill head |
| 05/12/1999 | DE19749007A1 Connection joining e.g. a ram drilling head with the pipeline pulled after it |
| 05/11/1999 | CA2137936C Retrievable whipstock arrangement and method |
| 05/11/1999 | CA2096820C Directional drilling with downhole motor on coiled tubing |
| 05/06/1999 | EP0913621A1 Method of replacing a burried supply pipe and an apparatus for carrying out this method |
| 05/06/1999 | EP0913552A2 Method and apparatus for establishing a borehole parallel to an existing underground cable |
| 05/06/1999 | EP0799363B1 Steerable drilling with downhole motor |
| 05/05/1999 | CN2317305Y Reducing borehole-enlarging drilling tool |
| 05/05/1999 | CN1215789A Well system |
| 05/05/1999 | CN1215705A Mining filling and blocking low water-bearing cementing powder |
| 05/04/1999 | US5899283 Drill bit for horizontal directional drilling of rock formations |
| 05/04/1999 | US5899281 Adjustable bend connection and method for connecting a downhole motor to a bit |
| 04/30/1999 | CA2252452A1 Portable earth drilling apparatus with telescopic mast |
| 04/29/1999 | DE19747087A1 Drill piece and shaft advanced under power through underground pipe |
| 04/29/1999 | CA2250666A1 Method and apparatus for achieving parallel cable boring |
| 04/28/1999 | EP0911483A2 Well system including composite pipes and a downhole propulsion system |
| 04/28/1999 | EP0745175B1 Process for removing the core of earth from a pipe laid without excavation and scraper for implementing said process |
| 04/27/1999 | US5897062 Fluid jet nozzle and stress improving treatment method using the nozzle |
| 04/27/1999 | US5896938 Portable electrohydraulic mining drill |
| 04/27/1999 | US5896936 Arrangement for controlling boom for rock drilling unit |
| 04/27/1999 | US5896935 Arrangement in boom for rock drilling unit |
| 04/27/1999 | CA2122163C Method and apparatus for erosive stimulation of open hole formations |
| 04/27/1999 | CA2006920C Equipment for boring mountings including an operating element, a motor and control means |
| 04/22/1999 | WO1999019596A2 Directional drilling tool |
| 04/22/1999 | WO1999019595A1 Method and system for drilling underbalanced radial wells utilizing a dual string technique in a live well |
| 04/22/1999 | CA2306944A1 Directional drilling tool |
| 04/21/1999 | CN2315286Y Drilling and disc enlarging machine of changeable ridigity pile |
| 04/20/1999 | US5895176 Device for connecting a pipeline conduit to a ground-boring machine |
| 04/20/1999 | US5894897 Method and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells |
| 04/20/1999 | US5894896 Orienting tool for coiled tubing drilling |
| 04/20/1999 | US5894889 One trip milling system |
| 04/14/1999 | EP0908598A2 Method for laying a conduit and conduit comprising a casing and a production tubing |
| 04/14/1999 | CN2314084Y Apparatus for boring for rigidity varying piles |
| 04/14/1999 | CN1214101A Directional boring |
| 04/14/1999 | CN1042909C Spiral anchor with deoperable screw |
| 04/13/1999 | US5893421 Arrangement for mounting swing cylinders in boom for rock drilling unit |
| 04/08/1999 | DE19732479C1 Hammer drill |
| 04/07/1999 | EP0906487A1 A system for directional control of drilling |
| 04/07/1999 | EP0737268B1 Control device for drilling a bore hole |
| 04/07/1999 | EP0614505B1 Template and process for drilling and completing multiple wells |
| 04/06/1999 | US5890547 Pressure converter |
| 04/06/1999 | CA2141737C Drilling a bore hole having a short radius curved section followed by a straight section |
| 04/01/1999 | DE19744211A1 Ice drill for extracting sea ice cores |
| 03/31/1999 | EP0905347A2 Device and method for enlarging a bore |
| 03/31/1999 | EP0904478A1 Drilling apparatus |
| 03/30/1999 | US5889587 Mobile inductively coupled plasma system |
| 03/30/1999 | US5888447 Self-Extinguishing burning bar |
| 03/30/1999 | US5887668 Wellbore milling-- drilling |
| 03/30/1999 | US5887667 Method and means for drilling an earthen hole |
| 03/30/1999 | US5887655 Wellbore milling and drilling |
| 03/24/1999 | EP0728050A4 Method and system of trajectory prediction and control using pdc bits |
| 03/24/1999 | CN2311598Y Directional drilling position dial disc |
| 03/23/1999 | US5885027 Transmission line installation |
| 03/23/1999 | US5884712 Arrangement for a telescope feeder of a rock-drilling machine |
| 03/23/1999 | US5884704 Methods of completing a subterranean well and associated apparatus |
| 03/23/1999 | US5884698 Whipstock assembly |
| 03/18/1999 | WO1999013198A1 Close proximity wellheads |
| 03/18/1999 | DE19754764C1 Drive cylinder for underground pipe tunnel |
| 03/18/1999 | DE19749771C1 Packing material deposition method for supply line laying |
| 03/17/1999 | EP0901562A1 Downhole apparatus |
| 03/17/1999 | EP0901561A1 A hydraulic device to be connected in a pipe string |
| 03/17/1999 | EP0901560A1 Apparatus and a method for drilling boreholes |
| 03/17/1999 | EP0901559A1 Multicut window mill |
| 03/17/1999 | EP0901558A1 Sectional drive system |
| 03/16/1999 | US5881827 Extendable bit |
| 03/16/1999 | US5881824 Bottomhole assembly orienting sub |
| 03/16/1999 | US5881808 Window-cutting system for downhole tubulars |
| 03/16/1999 | CA2152383C Assembly and process for drilling and completing multiple wells |
| 03/10/1999 | EP0900320A1 System and method for placement and retrieval of a subsurface diverting tool used in drilling and completing wells |
| 03/10/1999 | EP0792407A4 Single-wire guidance system for drilling boreholes |
| 03/10/1999 | EP0772725B1 Method of installing a whipstock |
| 03/10/1999 | EP0664011B1 Vibrating hole forming device for seismic exploration |
| 03/10/1999 | CN2310146Y Perpendicular rule for directional well Kelly bar |
| 03/10/1999 | CN2310145Y Clinometer for directional well adjustable drilling rod |
| 03/10/1999 | CN2310144Y Marking gauge for directional well drilling rod |
| 03/10/1999 | CN2310143Y Auxiliary action total hydraulic open-air hidden hole drill |
| 03/09/1999 | US5879057 Horizontal remote mining system, and method |
| 03/09/1999 | US5878825 Underground propelling method |
| 03/09/1999 | US5878824 Boring tool or other device including thermal protection for an electronic component assembly and method |
| 03/09/1999 | US5878818 Mechanical set anchor with slips pocket |
| 03/09/1999 | US5878815 Assembly and process for drilling and completing multiple wells |
| 03/04/1999 | DE19738171A1 Boring machine with driving slide on guide column |
| 03/04/1999 | DE19737936A1 Underground-mining machine |
| 03/03/1999 | EP0770223B1 Tunnelling apparatus, method of using such tunnelling apparatus, and cutting head for such tunnelling apparatus |
| 03/03/1999 | CN1209858A Method for forming window in tubular and apparatus for use in said method |
| 03/02/1999 | US5876152 Ramming drill for destructive replacement of buried pipelines |
| 03/02/1999 | US5875859 Device for controlling the drilling direction of drill bit |
| 03/02/1999 | US5875847 Multilateral sealing |
| 02/25/1999 | WO1999009290A1 Drilling system with means for anchoring in the borehole |
| 02/25/1999 | DE19736662A1 Coal face cutter |
| 02/24/1999 | EP0897456A2 Multi-lateral wellbore systems and methods for forming same |
| 02/24/1999 | CN1209184A Trencbless underground boring system with boring location |
| 02/24/1999 | CN1208809A Formation data sensing with deployed remote sensors during well drilling |
| 02/23/1999 | US5873676 Coring rod support wheel |
| 02/23/1999 | US5873421 Tool for installing a pipeline under a structure |