| Patents for E21B 31 - Fishing for or freeing objects in boreholes or wells (3,788) |
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| 03/03/2005 | US20050045381 Method of stabilizing a downhole drilling motor and a downhole drilling motor |
| 03/03/2005 | US20050045339 Drilling jar for use in a downhole network |
| 03/02/2005 | CN2682193Y Salvaging device |
| 03/02/2005 | CN1587636A Full well back circulation fishing process and matching device |
| 03/02/2005 | CN1587630A Rope salvaging type filing discharge stepless drilling and forming hole method and machine tool |
| 02/24/2005 | DE10392229T5 Absenkbares stoßaktiviertes Bohrlochvibrationswerkzeug Lowerable shock-activated downhole vibration tool |
| 02/23/2005 | EP0975853B1 Downhole coiled tubing recovery apparatus |
| 02/17/2005 | WO2005014970A1 Shear strength reduction method and apparatus |
| 02/17/2005 | US20050034894 Core orientation |
| 02/16/2005 | CN2679349Y Oblique recovering and fishing tool for branch hole |
| 02/09/2005 | CN2677596Y Wall hook type female coupling tap |
| 02/08/2005 | US6851476 Dual sensor freepoint tool |
| 02/08/2005 | CA2384475C Screened boot basket/filter |
| 02/03/2005 | US20050023739 Shock absorbing and shock force generating apparatus and method for an oil pump |
| 02/02/2005 | EP1502001A2 Packer retriever |
| 02/02/2005 | CN2675846Y Salvage cylinder with opening and window |
| 02/01/2005 | US6848507 Expandable wirefinder and method for use of same |
| 02/01/2005 | US6848506 Rotary driven retrieval tool for horizontal directional drilling operations |
| 01/25/2005 | US6845818 Method of freeing stuck drill pipe |
| 01/20/2005 | WO2004079153A3 Casing running and drilling system |
| 01/19/2005 | CN2672282Y Hydraulic force generator in well |
| 01/13/2005 | US20050006146 Shear strength reduction method and apparatus |
| 01/12/2005 | CN2670585Y Spiral eccentric conical sucker rod fishing gear |
| 01/06/2005 | US20050000735 Hydraulic-mechanical jar tool |
| 01/06/2005 | US20050000697 Formed tubulars |
| 01/06/2005 | US20050000684 Apparatus for handling tubular goods |
| 01/05/2005 | CN2668836Y Water-sealing throwing-catching device for detecting oil-water layer of oil-field |
| 01/05/2005 | CN2668835Y Oil-pipe bailing system |
| 01/05/2005 | CN2668834Y Grind-shoe bailing device for dropping article of well-drilling |
| 01/05/2005 | CN2668821Y Self-positioning recoverable oblique device |
| 01/05/2005 | CN1560426A Device for catching object in well |
| 01/04/2005 | CA2349353C Downhole vibrator |
| 01/04/2005 | CA2273767C Downhole jar apparatus for use in oil and gas wells |
| 12/30/2004 | US20040262005 Latch mechanism guide |
| 12/30/2004 | US20040262004 Method and apparatus for backing off a tubular member from a wellbore |
| 12/29/2004 | EP1491715A2 Method and apparatus for backing off a tubular member from a wellbore |
| 12/23/2004 | US20040256871 Hydraulic overshot tool without a nozzle, and method of retrieving a cylinder |
| 12/22/2004 | CN2665349Y Fan-shaped knife wing flat-bottomed milling shoe |
| 12/16/2004 | US20040251027 Co-pilot measurement-while-fishing tool devices and methods |
| 12/15/2004 | EP1274992A4 Apparatus and method for downhole well equipment and process management, identification, and actuation |
| 12/15/2004 | CN2663644Y Salvaging cup of following drill |
| 12/08/2004 | EP1483478A1 Double-cone device and pump |
| 12/08/2004 | EP1019612A4 Converted dual-acting hydraulic drilling jar |
| 12/02/2004 | US20040238171 Wellbore recovery operation |
| 12/01/2004 | CN2660097Y Perforation washing tool |
| 11/30/2004 | CA2357820C Hydraulic wireline cutter |
| 11/24/2004 | CN2658376Y Slipper trip spear |
| 11/24/2004 | CN2658375Y Fisher |
| 11/17/2004 | EP1476636A1 Arrangement in a gripper mechanism for a free pipe/rodlike end portion of a downhole tool |
| 11/10/2004 | CN2654844Y Hook type fishing device |
| 11/10/2004 | CN1544795A Pyrotechnic composition for thermal pipe cutter and process for making same |
| 11/04/2004 | US20040216924 Casing running and drilling system |
| 11/04/2004 | US20040216880 Method of freeing stuck drill pipe |
| 11/04/2004 | US20040216869 Hydraulic jar lock |
| 11/03/2004 | EP1473435A1 Automatically actuating locking mechanism for a downhole tool |
| 11/03/2004 | CN2653118Y Float multiple wheel fisher |
| 11/02/2004 | CA2302926C One-trip casing cutting and removal apparatus |
| 10/28/2004 | WO2004092527A2 Apparatus for radially expanding and plastically deforming a tubular member |
| 10/28/2004 | US20040211949 Line retrieval system |
| 10/28/2004 | CA2523779A1 Apparatus for radially expanding and plastically deforming a tubular member |
| 10/27/2004 | CN2651424Y Reversible composite milling and fishing tool |
| 10/27/2004 | CN2651423Y Pressure jetting composite milling fishing tool |
| 10/20/2004 | EP1015729B1 Connection of tubulars using a top drive |
| 10/20/2004 | CN1538034A Well washing method of hierarchical water injection well and its underwell tubular column |
| 10/19/2004 | US6805197 Hydraulic wireline cutter |
| 10/14/2004 | US20040200343 Explosive pipe severing tool |
| 10/13/2004 | CN2648045Y Turbine fishing drum for electric submersible pump |
| 10/07/2004 | US20040195852 Lockable overshot |
| 10/06/2004 | CN2646372Y Pressure spring type screw thread slips for salvaging |
| 10/06/2004 | CN2646371Y Novel packaged milling tool for drillable bridge plug |
| 10/06/2004 | CN2646370Y Pipe fisher capable of washing and filtering sand |
| 09/30/2004 | US20040188085 Downhole jarring tool adjuster |
| 09/30/2004 | US20040188084 E-line downhole jarring tool |
| 09/22/2004 | EP1114116B1 Aphron-containing well drilling and servicing fluids of enhanced stability |
| 09/16/2004 | WO2004079153A2 Casing running and drilling system |
| 09/15/2004 | CN2641272Y Open hole rope-like faller special fisher |
| 09/14/2004 | CA2323405C A method for improving performance of fishing and drilling jars in deviated and extended reach well bores |
| 09/08/2004 | EP1454034A1 Method of freeing stuck drill pipe |
| 09/08/2004 | EP1454033A1 Orientation device for a core sample |
| 09/02/2004 | WO2004074630A1 Downhole measurements during non-drilling operations |
| 09/01/2004 | EP1032748B1 Flexible sinker bar assemblies |
| 09/01/2004 | CN2637711Y Reverse circulation oil pump rod strengthener fishing barrel |
| 08/31/2004 | US6782951 Flow-activated valve and method of use |
| 08/24/2004 | CA2350858C Pressure pulse attenuator |
| 08/11/2004 | CN2632298Y Slips-type tool extractor |
| 08/05/2004 | WO2003078942A3 Radioactive bullet retrieval |
| 08/05/2004 | WO2003033855A3 Apparatus and methods for jarring |
| 08/04/2004 | CN2630478Y Well cementation hollow rubber plug fisher |
| 08/04/2004 | CN2630477Y Water well casing pipe fisher |
| 07/28/2004 | CN2628713Y Sucker rod overshot |
| 07/28/2004 | CN1515780A Method for deblocking blocked pipe for extracting mirabilite ore deposit by using water soluble method and its equipment |
| 07/27/2004 | CA2227601C Wellbore resonance tools |
| 07/22/2004 | US20040140131 Downhole tool |
| 07/22/2004 | US20040140101 Wireline fishing safety sleeve |
| 07/21/2004 | CN2627202Y Composite cable latch jack |
| 07/20/2004 | US6763753 Hydraulic wireline cutter |
| 07/15/2004 | WO2003093624A3 Packer retriever |
| 07/08/2004 | WO2004057149A1 Devices and methods for retrieving elements from wells |
| 07/07/2004 | EP1434925A1 Wellbore recovery operation |
| 07/06/2004 | US6758267 Process and arrangement for retrieving of equipment from bore holes |