| Patents for E21B 31 - Fishing for or freeing objects in boreholes or wells (3,788) |
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| 07/07/1998 | US5775423 Valve for a two way hydraulic drilling jar and a two way hydraulic drilling jar |
| 07/02/1998 | DE19654654A1 Borehole casing method suitable for unsure formations |
| 07/01/1998 | EP0695391B1 Reduced waiting time hydraulic drilling jar |
| 06/30/1998 | US5771969 Helical bearing anchor and catcher |
| 06/16/1998 | US5765638 Tool for use in retrieving an essentially cylindrical object from a well bore |
| 06/09/1998 | US5762143 System and method for placement and retrieval of a subsurface diverting tool used in drilling and completing wells |
| 06/04/1998 | WO1998012414A3 Double acting hydraulic jar |
| 05/28/1998 | WO1998022692A1 Wireline/coiled tubing retrievable well pump |
| 05/28/1998 | CA2242583A1 Wireline/coiled tubing retrievable well pump |
| 05/13/1998 | CN2281419Y Hydraulic assembled water distributing apparatus |
| 05/07/1998 | WO1998019041A1 Impact tool |
| 04/09/1998 | WO1998014687A1 Novel method of drilling well bores |
| 04/02/1998 | WO1998013576A1 Safety joint |
| 03/26/1998 | WO1998012414A2 Double acting hydraulic jar |
| 03/25/1998 | EP0830493A1 Mechanical-hydraulic double-acting drilling jar |
| 03/24/1998 | US5731705 Electromagnetic lifting device |
| 03/11/1998 | CN2276071Y Hydraulic flat-bottom grind shoes |
| 03/04/1998 | CN1175301A Method of extracting a hollow unit laid in the ground |
| 02/25/1998 | EP0825324A2 Tool connector |
| 02/16/1998 | CA2212696A1 Latch and release tool connector and method |
| 02/04/1998 | CN2273766Y Arrangement for tishing integral bore-bit of down-the-hole drill |
| 01/22/1998 | WO1998002638A1 Apparatus and method for performing imaging and downhole operations at work site in wellbores |
| 01/21/1998 | EP0819207A1 Method for improved water well production |
| 01/20/1998 | US5709268 Method and apparatus for jarring |
| 01/15/1998 | WO1998001652A1 Apparatus and method for retrieving an object from a wellbore |
| 12/11/1997 | WO1997046791A1 Method and device for facilitating the insertion of a coiled tube into a well and for loosening stuck objects in a well |
| 12/11/1997 | WO1997046787A1 A hydraulic device to be connected in a pipe string |
| 12/04/1997 | WO1997045623A1 System and method for placement and retrieval of a subsurface diverting tool used in drilling and completing wells |
| 12/04/1997 | WO1997045622A1 Wellbore resonance tools |
| 12/03/1997 | CN2269460Y Guide cone mill shoe |
| 11/26/1997 | EP0808436A1 Method of extracting a hollow unit laid in the ground |
| 11/25/1997 | US5690170 Hydraulic cutting overshot |
| 11/20/1997 | WO1997043517A1 Washpipe stabilisation |
| 11/20/1997 | CA2253753A1 Washpipe stabilisation |
| 11/18/1997 | CA2034962C Downhole force generator |
| 11/18/1997 | CA2014217C Drill rod retrieval device |
| 11/11/1997 | US5685574 Snap latch seal locator for sealingly latching tubing to a packer in a wellbore |
| 11/04/1997 | US5682950 Means for collecting unwanted material in an oil or gas well |
| 10/07/1997 | US5673754 Method and apparatus for downhole fishing operations |
| 09/30/1997 | US5671810 Composition and method for relief of differential sticking during drilling |
| 09/23/1997 | US5669458 Rotary jar |
| 08/28/1997 | WO1997019248A3 Downhole equipment |
| 08/26/1997 | US5660239 Drag analysis method |
| 07/29/1997 | US5652200 Water based drilling fluid additive and methods of using fluids containing additives |
| 07/26/1997 | CA2167851A1 Dual self-operating fishing tool |
| 07/15/1997 | US5647446 Two way hydraulic drilling jar |
| 07/02/1997 | CN1153251A Eccentric water-nozzle oil-nozzle water distributor and pulling and running tool |
| 07/01/1997 | US5642912 Pulling attachment for plastic pipe and slip lining head |
| 06/17/1997 | US5639135 Fishing tool and method of operation |
| 06/11/1997 | EP0778392A2 Method and apparatus for removing the uppermost part of a construction in the seabed |
| 06/03/1997 | US5634524 Reverse percussion device |
| 05/29/1997 | WO1997019248A2 Downhole equipment |
| 05/28/1997 | CN2254951Y Eccentric active cover type overshot for gripping sucker rod |
| 05/13/1997 | US5628624 Pump barrel valve assembly including seal/actuator element |
| 05/07/1997 | DE19607338C1 Fishing-tool for equipment in borehole |
| 04/29/1997 | US5624001 Mechanical-hydraulic double-acting drilling jar |
| 03/19/1997 | CN2249820Y Gripper for lifting suction rod |
| 03/05/1997 | EP0597885B1 A double-acting accelerator for use with hydraulic drilling jars |
| 02/26/1997 | EP0759116A1 Reverse percussion device |
| 02/25/1997 | US5605879 Olefin isomers as lubricants, rate of penetration enhancers, and spotting fluid additives for water-based drilling fluids |
| 02/25/1997 | US5605366 External pulling tool and method of operation |
| 01/21/1997 | US5595253 Hydraulic jar with improved detent ring |
| 01/21/1997 | US5595244 Hydraulic jar |
| 12/27/1996 | WO1996032599A3 Pump barrel seal assembly including seal/actuator element |
| 12/19/1996 | WO1996041064A1 Mechanical-hydraulic double-acting drilling jar |
| 12/18/1996 | EP0748925A1 Method and device for casing a borehole with a deformable pipe |
| 12/17/1996 | US5584353 Well jar accelerator with expansion chamber |
| 12/11/1996 | EP0746664A1 Whipstock apparatus and methods of use |
| 12/11/1996 | CN2242333Y Apparatus for fishing sediment from bottom of well |
| 12/03/1996 | US5580114 For retrieving an object from a wellbore |
| 12/03/1996 | US5579845 Method for improved water well production |
| 11/05/1996 | CA2105930C Hydraulic jar device |
| 10/30/1996 | CN2238906Y Eccentric water nozzle and oil nozzle water service apparatus and throwing tool |
| 10/24/1996 | WO1996033250A1 Olefin isomers as lubricants, rate of penetration enhancers, and spotting fluid additives for water-based drilling fluids |
| 10/17/1996 | WO1996032599A2 Pump barrel seal assembly including seal/actuator element |
| 09/25/1996 | CN2236015Y Sand-removing device of well-drilling liquid circulation pot |
| 09/18/1996 | CN2235498Y Alternating magnetization device |
| 09/17/1996 | US5556900 Modified asphalts for paving and roofing |
| 09/17/1996 | US5555937 Method and combination of materials for releasing a stuck pipe |
| 09/10/1996 | US5553671 Piston sub for isolating drilling fluids from hydraulic fluids |
| 09/07/1996 | CA2170546A1 Well jar accelerator with expansion chamber |
| 08/27/1996 | US5549163 Piston sleeve valve for use with oilfield fishing operations |
| 08/15/1996 | WO1996024794A1 Method of extracting a hollow unit laid in the ground |
| 08/15/1996 | WO1996024746A1 Method for improved water well production |
| 08/15/1996 | CA2211852A1 Method of extracting a hollow unit laid in the ground |
| 08/14/1996 | DE19505517A1 Verfahren zum Herausziehen eines im Erdreich verlegten Rohres A method for extracting a pipe laid in the ground |
| 08/13/1996 | CA2015647C Valve used in a hydraulic drilling jar |
| 07/09/1996 | US5533876 Pump barrel seal assembly including seal/actuator element |
| 06/18/1996 | CA2072851C Hydraulic jar |
| 06/13/1996 | WO1996018021A1 Jar apparatus and method of jarring |
| 05/30/1996 | WO1996016247A1 Pulling tool and method of operation |
| 05/26/1996 | CA2162942A1 Hydraulically actuated fishing tool |
| 05/14/1996 | US5515922 Recovery tool |
| 05/08/1996 | EP0710317A1 Bidirectional hydraulic jar |
| 05/01/1996 | CN2226140Y Device for cleaning and removing blockage under well by jetting water |
| 04/24/1996 | CN2225537Y Milling type under well milling shoe |
| 04/16/1996 | US5508915 Method to combine statistical and engineering techniques for stuck pipe data analysis |
| 04/16/1996 | US5507347 Method and apparatus for jarring |
| 04/02/1996 | US5503228 Jar apparatus and method of jarring |
| 03/19/1996 | US5499687 Downhole valve for oil/gas well |