| Patents for E21B 31 - Fishing for or freeing objects in boreholes or wells (3,788) |
|---|
| 10/19/1993 | US5253710 From a wellbore |
| 10/13/1993 | EP0565500A1 Rock drilling device |
| 10/05/1993 | US5249625 Soft set overshot fishing tool |
| 09/28/1993 | US5247992 Using acid |
| 09/13/1993 | CA2090352A1 Method and apparatus for retrieving wire line from a well bore |
| 09/07/1993 | US5242201 Fishing tool |
| 09/02/1993 | WO1993016833A1 Broaching tool for tubing |
| 09/01/1993 | CN2141461Y Back off type oil tube bailing spear |
| 09/01/1993 | CN2141460Y Block eliminating tube for well measuring |
| 09/01/1993 | CN1021984C Intensely-magnetic waxproof viscosity-reducing rare-earth fishing tool |
| 08/25/1993 | CN2140953Y Auxiliary lifting device for friction shoe of mechanical jar |
| 08/17/1993 | US5236038 In combination with a rod string mounted within a tubing |
| 08/10/1993 | US5234056 Sonic method and apparatus for freeing a stuck drill string |
| 08/03/1993 | US5232060 Double-acting accelerator for use with hydraulic drilling jars |
| 07/21/1993 | EP0552087A2 Apparatus and method for retrieving and/or communicating with downhole equipment |
| 07/20/1993 | US5228507 Wireline hydraulic retrieving tool |
| 07/14/1993 | CN2138190Y Electric motor latch jack |
| 07/14/1993 | CN2138189Y Self attracting latch jack combined with strong magnet |
| 07/14/1993 | CN2138188Y Multifunctional latch jack for treating undergroud accident |
| 07/07/1993 | EP0549770A1 Methods of drilling well boreholes and compositions used therein |
| 06/29/1993 | US5222718 Flanged washer spring |
| 06/29/1993 | CA1319675C Apparatus for vibrating a pipe string in a borehole |
| 06/16/1993 | CN2136324Y Internal pipe releasing device |
| 06/09/1993 | CN2135643Y Special pliers for changing rod sealing device of oil suction machine |
| 06/08/1993 | US5217070 Drill string jarring and bumping tool |
| 05/25/1993 | US5213166 Pile driving and pile removing method |
| 04/27/1993 | US5205357 Latching device |
| 04/21/1993 | CN2130214Y Single pump water flushing oil pump |
| 04/15/1993 | WO1993007358A1 Circulation equipment |
| 03/30/1993 | US5197773 Running and pulling tool |
| 03/17/1993 | EP0507838A4 Polymer and asphalt reaction process and polymer-linked-asphalt product |
| 03/04/1993 | WO1993004258A1 A double-acting accelerator for use with hydraulic drilling jars |
| 02/10/1993 | CN1068842A Methods of drilling well boreholes and compositions used therein |
| 01/26/1993 | US5181571 Well casing flotation device and method |
| 01/19/1993 | WO1993002151A1 Methods of drilling well boreholes and compositions used therein |
| 01/19/1993 | US5181172 Method for predicting drillstring sticking |
| 01/19/1993 | US5180012 Method for carrying tool on coil tubing with shifting sub |
| 01/19/1993 | CA2088480A1 Methods of drilling well boreholes and compositions used therein |
| 01/05/1993 | US5176208 Reverse circulation tool handling cuttings and debris |
| 12/30/1992 | CN2126309U Hydraulic reverse-buckling device |
| 12/29/1992 | US5174393 Hydraulic jar |
| 12/23/1992 | CN2125692U Fishing float |
| 12/23/1992 | CN2125691U Eerthquake drill hole center fishing drilling set in pipe |
| 12/15/1992 | US5170843 Hydro-recocking down jar mechanism |
| 12/12/1992 | WO1992022728A1 Method for continuing a measuring operation after recovering a measuring instrument stuck in a well |
| 12/12/1992 | CA2089144A1 Process for continuing a measuring operation after recovering a measuring instrument stuck in a well |
| 11/26/1992 | DE4116844A1 Drill head release - has housing fitted to drill rod with piston operated by a fired charge to deliver a hammer blow to free head in stone etc. |
| 11/26/1992 | DE4116843A1 Drill head release - fires a water charge through the drilling rod to free head stock in stone |
| 11/25/1992 | CN2122930U Overshot |
| 11/04/1992 | CN2120877U Permanent-magnet fishing tool |
| 10/29/1992 | WO1992018749A1 Device for collecting particulate matter and debris in horizontal or high deviation oil or gas wells |
| 10/20/1992 | US5156223 Fluid operated vibratory jar with rotating bit |
| 10/20/1992 | US5156211 Remotely adjustable fishing jar and method for using same |
| 10/14/1992 | EP0507838A1 Polymer and asphalt reaction process and polymer-linked-asphalt product |
| 09/29/1992 | US5150757 Methods and apparatus for drilling subterranean wells |
| 09/29/1992 | CA1308153C Anti-blockage bearing |
| 09/23/1992 | EP0504848A1 Method and apparatus to cut and remove casing |
| 09/23/1992 | CN2116774U Finger grip for eccentric plugging unit skew |
| 09/22/1992 | US5149163 For removing broken sucker rod in a deep well |
| 09/17/1992 | WO1992015767A1 Method for retrieving well casings using an internal gripping device |
| 09/16/1992 | EP0503275A2 Large bore hydraulic drilling jar |
| 09/16/1992 | CN2116082U Grappling tools for askew eccentric plugging device |
| 09/15/1992 | US5146989 Apparatus for recovering a wellhead |
| 09/08/1992 | US5145228 Running and pulling tool |
| 08/25/1992 | US5141275 Drill rod retrieval device |
| 08/19/1992 | CN2113337U Tip core type overshot |
| 08/18/1992 | US5139086 Double acting accelerator jar |
| 08/18/1992 | CA1306458C Drilling tool |
| 08/05/1992 | CN2112002U Silt fishing gear |
| 08/04/1992 | US5135050 Device for collecting particulate matter and debris in horizontal or high-deviation oil or gas wells |
| 07/15/1992 | CN1017463B Detonation assembly for explosive wellhead severing system |
| 06/25/1992 | WO1992010638A1 Mechanical down jar mechanism |
| 06/23/1992 | US5123493 Valve used in a hydraulic drilling jar |
| 06/23/1992 | US5123489 Milling tool and method for removing a packer |
| 06/17/1992 | EP0489816A1 Well casing flotation device and method |
| 06/17/1992 | CN2107521U Magnetic wax-proof assembly tool |
| 06/09/1992 | US5119891 Adaptor for drilling strings with controllable air passage |
| 06/02/1992 | US5117915 Well casing flotation device and method |
| 05/26/1992 | US5116147 Anti-blockage bearing |
| 05/20/1992 | CN2104926U Well grappling means |
| 05/11/1992 | CA2058703A1 Latch mechanism for use in association with a mechanical drilling jar |
| 04/22/1992 | CN2102367U Spring salvage tube |
| 04/21/1992 | US5106140 Oil-field wireline fishing tool |
| 04/14/1992 | US5103903 Jar |
| 04/08/1992 | CN1016204B Apparatus for avoiding stuck drilling equipment method of determining probability of unsticking stuck drill pipe |
| 04/07/1992 | US5101895 Well abandonment system |
| 04/01/1992 | EP0477452A2 Downhole force generator |
| 02/25/1992 | US5090481 Fluid flow control apparatus, shifting tool and method for oil and gas wells |
| 02/19/1992 | EP0471588A1 Grapples |
| 02/11/1992 | US5086853 Large bore hydraulic drilling jar |
| 02/05/1992 | EP0469962A1 Method and apparatus for removing an elongate member axially embedded in a tubular pipe |
| 02/04/1992 | US5085479 Vertically manipulated ratchet fishing tool |
| 02/04/1992 | CA1295320C Jar mechanism accelerator |
| 12/24/1991 | US5074361 Method of latching |
| 12/18/1991 | EP0461819A2 Ball-grab spear |
| 12/10/1991 | US5070941 Downhole force generator |
| 12/03/1991 | US5069282 Mechanical down jar mechanism |
| 11/20/1991 | CN1056333A Hydraulic drilling jar |
| 11/19/1991 | US5065823 Extraction device for pneumatically actuated drilling tools |
| 11/13/1991 | EP0456305A2 Hydraulic drilling jar |