| Patents for E21B 31 - Fishing for or freeing objects in boreholes or wells (3,788) |
|---|
| 01/26/2000 | EP0973995A1 Wellbore overshot |
| 01/26/2000 | EP0973994A1 Apparatus for removing an item from a wellbore |
| 01/26/2000 | CN2360589Y Strong magnetic overshot |
| 01/26/2000 | CN2360588Y Sucking oil-water well sand dredging up appts. |
| 01/20/2000 | WO2000003116A1 Downhole tension swivel sub |
| 01/05/2000 | DE19853198C1 Replacement of underground pipes of different diameter without digging, with optional expansion to greater conducting cross-sections |
| 01/05/2000 | CN2357121Y Hydraulic fishing device for use in well |
| 01/04/2000 | US6009948 Resonance tools for use in wellbores |
| 12/29/1999 | WO1999067502A1 Tubular injector with snubbing jack and oscillator |
| 12/02/1999 | CA2273607A1 Coiled tubing drilling hydraulic disconnect |
| 11/30/1999 | US5992523 Latch and release perforating gun connector and method |
| 11/23/1999 | US5988287 Thru-tubing anchor seal assembly and/or packer release devices |
| 11/16/1999 | US5984582 Method of extracting a hollow unit laid in the ground |
| 11/16/1999 | US5984028 Converted dual-acting hydraulic drilling jar |
| 11/16/1999 | US5984009 Logging tool retrieval system |
| 10/27/1999 | CN2345684Y Underground manipulator |
| 10/26/1999 | US5971078 Method and apparatus for retrieving downhole tools |
| 10/19/1999 | US5967477 Clamps |
| 10/01/1999 | CA2266880A1 Wellhead retrieving tool |
| 09/28/1999 | US5957209 Latch and release tool connector and method |
| 09/27/1999 | CA2227125A1 Rod centralizer fishing tool |
| 09/21/1999 | US5954483 Guide member details for a through-tubing retrievable well pump |
| 09/21/1999 | CA2186201C Valve for a two way hydraulic drilling jar and a two way hydraulic drilling jar |
| 09/21/1999 | CA2139716C Methods of using reverse circulating tool in a well borehole |
| 09/11/1999 | CA2265039A1 Apparatus for removal of milling debris |
| 09/07/1999 | US5947202 Within a well bore |
| 08/31/1999 | US5945386 Glycol and glycol ether lubricants and spotting fluids |
| 08/31/1999 | US5944100 Junk bailer apparatus for use in retrieving debris from a well bore of an oil and gas well |
| 08/19/1999 | WO1999041487A1 Downhole coiled tubing recovery apparatus |
| 08/18/1999 | CN2333823Y Fishing spear |
| 08/11/1999 | EP0759116A4 Reverse percussion device |
| 08/03/1999 | US5931242 Jarring tool enhancer |
| 07/29/1999 | WO1999037877A2 System, apparatus and method for facilitating retrieval of an item from a well |
| 07/28/1999 | EP0931203A1 Apparatus and method for retrieving an object from a wellbore |
| 07/22/1999 | WO1999036487A1 Fluid and method for releasing tubular elements stuck in a well |
| 07/22/1999 | CA2318341A1 Fluid and method for releasing tubular elements stuck in a well |
| 07/20/1999 | US5924491 Thru-tubing anchor seal assembly and/or packer release devices |
| 07/14/1999 | EP0928361A1 Safety joint |
| 07/07/1999 | EP0927296A2 Double acting hydraulic jar |
| 07/06/1999 | US5918690 Bottom rotation shaft actuator |
| 07/06/1999 | US5918689 Jar enhancer |
| 07/06/1999 | US5918688 Gas-filled accelerator |
| 06/30/1999 | CN1221468A Hydraulic device to be connected in pipe string |
| 06/22/1999 | US5913365 From a well bore |
| 05/25/1999 | US5906239 Jarring tool |
| 05/06/1999 | WO1999022112A1 Downhole cutting separator |
| 04/29/1999 | WO1999020871A1 Flexible sinker bar assemblies |
| 04/22/1999 | WO1999019599A1 Gas-filled accelerator |
| 04/15/1999 | WO1999005386A3 Junk bailer for use in retrieving debris from a well |
| 04/15/1999 | WO1999000575A3 Drilling system with sensors for determining properties of drilling fluid downhole |
| 04/13/1999 | US5893708 Rotating piston for ball and seat valve assembly and downhole pump utilizing said valve assembly |
| 04/13/1999 | CA2148958C Apparatus and method for retrieving an object from a well bore, and method for making a tool for retrieving objects from a well bore |
| 03/30/1999 | US5887925 Combined washover and retrieval device |
| 03/17/1999 | EP0901561A1 A hydraulic device to be connected in a pipe string |
| 03/16/1999 | US5881816 Packer mill |
| 03/10/1999 | EP0900320A1 System and method for placement and retrieval of a subsurface diverting tool used in drilling and completing wells |
| 03/03/1999 | EP0898638A1 Washpipe stabilisation |
| 03/03/1999 | CN2309417Y Wall-contact sucker rod overshot with guide shoe |
| 03/02/1999 | US5875842 Multi-impact jarring apparatus and method for using same |
| 02/25/1999 | WO1999009296A1 Method and apparatus for engaging an object |
| 02/25/1999 | WO1999009295A1 Impact enhancing tool |
| 02/04/1999 | WO1999005386A2 Junk bailer for use in retrieving debris from a well |
| 02/04/1999 | CA2298011A1 Junk bailer apparatus for use in retrieving debris from a well bore of an oil and gas well |
| 02/03/1999 | CN2306313Y Anti-seizing rope fishing spear |
| 02/02/1999 | US5865253 For engaging/retrieving a collapsed coiled tubing in a wellbore |
| 01/28/1999 | WO1999004136A1 Converted dual-acting hydraulic drilling jar |
| 01/28/1999 | CA2307184A1 Converted dual-acting hydraulic drilling jar |
| 01/27/1999 | EP0819207A4 Method for improved water well production |
| 01/07/1999 | WO1999000575A2 Drilling system with sensors for determining properties of drilling fluid downhole |
| 12/29/1998 | CA2173797C Jar enhancer |
| 12/22/1998 | US5851958 Olefins and lubricants, rate of penetration enhancers, and spotting fluid additives for water-based drilling fluids |
| 12/09/1998 | CN2299935Y Fishing tool |
| 12/03/1998 | WO1998045568A3 Whipstock and installing and retrieving tools |
| 11/25/1998 | EP0879342A1 Wireline/coiled tubing retrievable well pump |
| 11/24/1998 | US5839520 Method of decreasing the tortuosity of a high deviated well bore |
| 11/17/1998 | US5837655 Purified paraffins as lubricants, rate of penetration enhancers, and spotting fluid additives for water-based drilling fluids |
| 11/03/1998 | CA2179594C Hydraulic jar |
| 10/22/1998 | WO1998046855A1 Apparatus for removing an item from a wellbore |
| 10/21/1998 | CN1196436A Device and process for operating working module |
| 10/20/1998 | US5823266 Latch and release tool connector and method |
| 10/15/1998 | WO1998045572A1 Wellbore overshot |
| 10/15/1998 | WO1998045568A2 Whipstock and installing and retrieving tools |
| 10/15/1998 | CA2286189A1 Wellbore overshot |
| 09/23/1998 | EP0866210A2 Method for operating a tool and apparatus for transmission of rotary torque and speed of rotation of a drive unit to that tool |
| 09/22/1998 | US5810410 Combined washover and retrieval device |
| 09/17/1998 | WO1998040600A1 Abnormal torque absorber for drilling |
| 09/16/1998 | CN2291497Y Drill bit deepwater salvaging device |
| 09/09/1998 | EP0862679A1 Downhole equipment |
| 09/08/1998 | US5803182 Bidirectional hydraulic jar |
| 09/02/1998 | EP0808436B1 Method of extracting a hollow unit laid in the ground |
| 08/19/1998 | CN2288264Y Appliance for fishing-up ball valve |
| 08/18/1998 | CA2036376C Apparatus for recovering a wellhead |
| 08/11/1998 | US5791712 Spear fishing tool |
| 08/11/1998 | US5791420 Jar enhancer |
| 08/06/1998 | WO1998034002A1 Bottom rotation shaft actuator |
| 08/04/1998 | US5787984 Method and device for casing a well with a composite pipe |
| 07/30/1998 | WO1998032946A1 A release equipment for a drill string |
| 07/22/1998 | CN2286496Y Tool for grappling object falling from well wall |
| 07/21/1998 | US5782297 Retrieval tool for back pressure valve and tree test plug |
| 07/07/1998 | US5775433 For latching to a well tool |