| Patents for E21B 31 - Fishing for or freeing objects in boreholes or wells (3,788) |
|---|
| 03/19/1996 | US5499682 Method for setting a slotted face wellbore deviation assembly using a rectilinear setting tool |
| 03/05/1996 | US5495902 Coil tubing hydraulic jar device |
| 02/07/1996 | EP0695391A1 Reduced waiting time hydraulic drilling jar |
| 02/07/1996 | CN2219373Y Waterpower impulse vibrator for oil well |
| 01/31/1996 | CN2218827Y Grappling tool of cone sliding teeth |
| 12/26/1995 | US5477921 Method and system for logging a well while fishing for the logging tool |
| 12/12/1995 | US5474133 Method for retreiving a slotted face wellbore deviation assembly using a retrieval tool |
| 12/12/1995 | US5474125 Retrieval tool for use with a slotted face wellbore deviation assembly |
| 12/12/1995 | US5474124 Wellhead retrieval tool assembly |
| 11/28/1995 | US5470118 Shear device for well service tools |
| 11/23/1995 | WO1995031629A1 Reverse percussion device |
| 11/21/1995 | US5467821 Rectilinear tool for use with a slotted face wellbore deviation assembly |
| 11/21/1995 | US5467820 Slotted face wellbore deviation assembly |
| 11/16/1995 | WO1995030818A1 Spotting fluid and lubricant |
| 11/16/1995 | WO1995023273A3 Whipstock apparatus and methods of use |
| 11/01/1995 | CN2211495Y Grasper |
| 10/26/1995 | WO1995028455A1 Glycol and glycol ether lubricants and spotting fluids |
| 10/10/1995 | US5456317 Buoyancy assisted running of perforated tubulars |
| 10/03/1995 | US5454420 Method and apparatus for rotating downhole tool in wellbore |
| 10/03/1995 | CA1337192C Fluid operated vibratory jar with rotating bit |
| 09/19/1995 | US5450913 Continuous soil sampling system and method |
| 09/13/1995 | CN2207440Y Screw arbor pump thermal-washing well side wall valve |
| 09/12/1995 | US5448911 Method and apparatus for detecting impending sticking of a drillstring |
| 09/06/1995 | EP0548303B1 Method for continuing a measuring operation after recovering a measuring instrument stuck in a well |
| 09/05/1995 | US5447196 Hydraulic jar |
| 08/31/1995 | WO1995023273A2 Whipstock apparatus and methods of use |
| 08/29/1995 | US5445229 Method and apparatus for drilling, cracking, and withdrawing earth cores |
| 08/09/1995 | CN2204850Y Underground pressure reducing, acid eliminating and blocking eliminator |
| 08/02/1995 | CN2204329Y Device for salvaging article dropped in well by means of machine hand |
| 08/01/1995 | US5438039 Using a mixture of polyaromatics, saturated hydrocarbons, and alkylbenzenes to dissolve; enhanced oil recovery |
| 07/27/1995 | WO1995020094A1 Method and combination of materials for releasing a stuck pipe |
| 07/26/1995 | CN2203998Y Spring impact means for releasing stuck parts |
| 07/26/1995 | CA2140214A1 Retrievable whipstock anchor assembly |
| 07/19/1995 | CN2203712Y Super magnetic overshot |
| 07/12/1995 | CN2203352Y Fisher |
| 07/11/1995 | US5431221 Jar enhancer |
| 06/20/1995 | US5425430 For enhancing impact delivered to an object stuck in a well bore |
| 06/20/1995 | US5425419 Whipstock apparatus and methods of use |
| 06/14/1995 | DE4443792A1 Vorrichtung zur Verriegelung und Abdichtung A device for locking and sealing |
| 06/08/1995 | WO1995015427A1 Jacking tool for coil tubing unit |
| 05/31/1995 | CN2199305Y Screw stem pump device for hot-flushing well |
| 05/31/1995 | CN1103102A Effective hydrocarbon blend for removing asphaltenes |
| 05/24/1995 | CN2198384Y Safety large hook of repairing well machine |
| 05/16/1995 | US5415230 In a well bore |
| 05/09/1995 | US5413186 Reverse percussion device |
| 05/09/1995 | US5413171 Latching and sealing assembly |
| 05/02/1995 | US5411107 Coil tubing hydraulic jar device |
| 05/02/1995 | CA1335449C Drilling equipment |
| 04/25/1995 | US5409065 Apparatus and method for retrieving an object from a well bore, and method for making a tool for retrieving objects from a well bore |
| 04/18/1995 | CA1335283C Method and apparatus for producing pressure variations in a drilling fluid |
| 04/13/1995 | WO1995009962A1 Continuous soil sampling system and method |
| 04/04/1995 | US5402850 Methods of using reverse circulating tool in a well borehole |
| 03/22/1995 | EP0644315A1 Effective hydrocarbon blend for removing asphaltenes |
| 03/22/1995 | CN2192718Y Multifunction link slide block spear |
| 03/22/1995 | CN2192717Y Mechanical upper hitter for well repairing |
| 03/21/1995 | US5398754 Retrievable whipstock anchor assembly |
| 03/21/1995 | US5398753 Wireline hydraulic retrieving tool and downhole power generating assembly |
| 01/17/1995 | US5382728 Effective hydrocarbon blend for removing asphaltenes |
| 01/12/1995 | WO1994025724A3 Reduced waiting time hydraulic drilling jar |
| 01/11/1995 | CN2187222Y Fishing gear |
| 01/04/1995 | CN2186796Y Drilling ware overshot |
| 12/07/1994 | CN2184776Y Curved oil pumping rod fishing tool |
| 12/06/1994 | US5370180 Downhole oil and gas well jacking tool for use with coil tubing unit |
| 11/10/1994 | WO1994025724A2 Reduced waiting time hydraulic drilling jar |
| 11/08/1994 | US5361844 Well fishing grapple assembly and method abstract |
| 11/01/1994 | CA2041900C Hydraulic drilling jar |
| 09/20/1994 | US5348086 Combination downhole tool |
| 09/13/1994 | CA1331984C Accelerator for fishing jar with hydrostatic assist |
| 09/01/1994 | WO1994019579A1 Method and apparatus for detecting impending sticking of a drillstring |
| 08/24/1994 | CN2175303Y Hydraulic impacting device for drilling machine |
| 08/18/1994 | WO1994018428A1 Bidirectional hydraulic jar |
| 07/26/1994 | CA2076499C Wireline hydraulic retrieving tool |
| 07/19/1994 | US5330018 Auto set bi-directional jar |
| 07/12/1994 | US5327984 Method of controlling cuttings accumulation in high-angle wells |
| 07/12/1994 | US5327982 Drill string jar apparatus |
| 06/14/1994 | US5320189 Rock drilling device |
| 06/08/1994 | CN2168066Y Permanent fishing device for magnetophilic objects in boreholes |
| 06/07/1994 | US5318139 Reduced waiting time hydraulic drilling jar |
| 06/07/1994 | US5318125 Method for continuing measurements after recovery of a measuring tool immobilized in a well |
| 06/07/1994 | US5318115 Casing cutting and retrieving tool |
| 05/31/1994 | US5316091 Method for reducing occurrences of stuck drill pipe |
| 04/28/1994 | WO1994009247A1 Drill string jar apparatus |
| 04/28/1994 | WO1994009242A1 Method and apparatus for rotating downhole tool in wellbore |
| 04/28/1994 | CA2147137A1 Drill string jar apparatus |
| 04/26/1994 | US5306750 Polymer containing epoxy compound; storage stability; road paving, roofing |
| 03/16/1994 | CN2158914Y High-pressure ringlike spraying-nozzle well-cleaning apparatus |
| 03/02/1994 | EP0436706B1 Apparatus for recovering a wellhead |
| 02/23/1994 | CN2157302Y Power multifunction fishing device |
| 02/22/1994 | US5287928 Apparatus and method for repairing a gravel-packed well completion |
| 01/11/1994 | US5278550 For use in association with a subsurface apparatus |
| 01/06/1994 | WO1994000666A1 Remotely-adjustable fishing jar and method for using same |
| 01/05/1994 | CN2152072Y Multifunction fishing spear |
| 01/05/1994 | CN1023419C Hydraulic drilling jar |
| 12/22/1993 | CN2150327Y Multifunction oil sampler |
| 12/07/1993 | US5267613 Upstroke jar |
| 12/01/1993 | CN2148173Y Fishing device for deep well pump |
| 11/30/1993 | US5265927 Downhole fishing tool |
| 11/30/1993 | US5265676 Method and apparatus for retrieving wire line from a well bore |
| 11/25/1993 | WO1993023653A1 Device for loosening drilling rods |
| 11/09/1993 | US5260268 Methods of drilling well boreholes and compositions used therein |