| Patents for E21B 23 - Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells (12,712) |
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| 09/24/1987 | WO1987005707A1 Downhole electromagnetic seismic source |
| 09/22/1987 | US4694878 Disconnect sub for a tubing conveyed perforating gun |
| 09/22/1987 | CA1227128A1 Well tool locking apparatus |
| 09/15/1987 | US4693309 Wireline set/tubing retrievable bridge plug |
| 09/08/1987 | US4691781 Well drilling and completion apparatus |
| 09/02/1987 | CN86202142U Well-working tool assembly tester |
| 09/01/1987 | US4690220 Tubular member anchoring arrangement and method |
| 09/01/1987 | US4690214 Method and a device for carrying out measurements and/or operations in a well |
| 08/25/1987 | US4688642 Rotatable liner with multiple simultaneously set liner hanger arrangement and method |
| 08/25/1987 | US4688641 Well packer with releasable head and method of releasing |
| 08/25/1987 | US4688638 Downhole corrosion coupon holder |
| 08/25/1987 | US4688634 Running and setting tool for well packers |
| 08/25/1987 | CA1225929A1 Retrievable insert landing assembly |
| 08/20/1987 | DE3701189A1 Method and device for fitting seismic sensors in an oil production well |
| 08/19/1987 | EP0233068A2 Setting device for zone gravel packing system |
| 08/19/1987 | EP0232646A1 Immobilizing device for a cardan-mounted detector set |
| 08/19/1987 | EP0232268A1 Device for controlling the locking of a sampling tube. |
| 08/18/1987 | US4687063 Well cementing method and apparatus |
| 08/12/1987 | EP0232183A2 Retrievable gravel packer |
| 08/12/1987 | EP0231694A1 Methods and apparatus for selectively controlling fluid communication between a pipe string and a well bore annulus |
| 08/11/1987 | USRE32469 Side pocket mandrel |
| 08/11/1987 | US4686653 Method and device for making geophysical measurements within a wellbore |
| 08/11/1987 | US4685523 Removable side pocket mandrel |
| 08/11/1987 | US4685516 Apparatus for operating wireline tools in wellbores |
| 08/05/1987 | EP0230812A1 Seismic probe, in particular for use in a non-tubed borehole |
| 08/04/1987 | US4683956 Method and apparatus for operating multiple tools in a well |
| 08/04/1987 | CA1225022A1 Submersible pump installation, methods and safety system |
| 07/29/1987 | CN87100310A Process and device for installing seismic sensors inside petroleum production well |
| 07/28/1987 | US4682657 Method and apparatus for the running and pulling of wire-line tools and the like in an oil or gas well |
| 07/21/1987 | US4681160 Apparatus for securing a measurement-while-drilling (MWD) instrument within a pipe |
| 07/21/1987 | US4681159 Setting tool for a well tool |
| 07/15/1987 | EP0228844A2 Downhole retrieving mechanism |
| 07/14/1987 | US4679624 Hydraulic setting tool |
| 07/14/1987 | CA1224139A1 Pressure responsive explosion initiator with time delay and method of use |
| 07/08/1987 | CN85109237A Device and method for sectioning and recovery of seabed surface casing |
| 07/07/1987 | US4678038 Side entry sub well logging apparatus and method |
| 07/07/1987 | US4678035 Methods and apparatus for subsurface testing of well bore fluids |
| 07/01/1987 | EP0227353A2 Annulus pressure responsive downhole tester valve |
| 06/30/1987 | US4676310 Apparatus for transporting measuring and/or logging equipment in a borehole |
| 06/23/1987 | USRE32441 Side pocket mandrel and method of construction |
| 06/23/1987 | US4674576 Casing hanger running tool |
| 06/23/1987 | US4674328 Method and apparatus for determining subsurface conditions using a tubing packoff tool |
| 06/23/1987 | CA1223293A1 Safety joint |
| 06/16/1987 | US4673036 Side pocket mandrel |
| 06/16/1987 | EP0225815A1 Tool for closing the production string of a well |
| 06/10/1987 | EP0225145A2 Plug for use in wellbore operations |
| 06/09/1987 | US4671361 Method and apparatus for hydraulically releasing from a gravel screen |
| 06/02/1987 | US4670862 Apparatus for producing geophysical measurements in a borehole |
| 06/02/1987 | US4669539 Lock for downhole apparatus |
| 06/02/1987 | US4669538 Double-grip thermal expansion screen hanger and running tool |
| 06/02/1987 | CA1222535A1 Apparatus in which an annular ring is carried within a groove about one member for slidably engaging the cylindrical surface of another member |
| 05/27/1987 | EP0223552A2 Downhole circulation valve and method for operating the same |
| 05/26/1987 | US4667743 Low pressure responsive tester valve with ratchet |
| 05/26/1987 | US4667736 Surface controlled subsurface safety valve |
| 05/21/1987 | WO1987003063A1 Handling device |
| 05/21/1987 | DE3539897A1 Method and arrangement for producing underground structural objects guided rectilinearly in a closed profile, in particular tunnel-like structures under the turf level, by pressing tube elements into the ground |
| 05/20/1987 | EP0222620A2 Assembly for reducing the force applied to a slot and lug guide |
| 05/12/1987 | US4664192 Cementing apparatus and methods |
| 05/12/1987 | US4664189 Method and device for carrying out measurements and operations in a well |
| 05/12/1987 | US4664188 Retrievable well packer |
| 05/12/1987 | US4664187 Retrievable bushing for well conduit |
| 05/06/1987 | CN85108997A Downhole tool with replaceable tool sleeve sections |
| 05/05/1987 | US4662453 Liner screen tieback packer apparatus and method |
| 05/05/1987 | US4662452 Injection control device for subterranean well conduit |
| 05/05/1987 | US4662450 Explosively set downhole apparatus |
| 05/05/1987 | CA1221306A1 Side pocket mandrel |
| 04/28/1987 | US4660637 For use in oil and gas wells |
| 04/21/1987 | US4658895 Gravel pack safety sub |
| 04/15/1987 | EP0218358A1 Borehole seismic receiver |
| 04/14/1987 | US4657082 Circulation valve and method for operating the same |
| 04/14/1987 | US4657078 Method and device for testing a well bore packer |
| 04/14/1987 | US4657077 Locking production seal assembly |
| 04/14/1987 | US4657076 Chemical injection tube mounting structure for geothermal well |
| 04/14/1987 | CA1220418A1 Apparatus and method for rotating coil tubing in a well |
| 04/09/1987 | WO1987002095A1 Gauge carrier for incorporation into tubing for flow-testing of oil and gas exploration wells |
| 04/09/1987 | WO1987002091A1 A method and a device for deep hole drilling |
| 04/07/1987 | US4655290 Latching production seal assembly |
| 04/07/1987 | US4655289 Remote control selector valve |
| 04/01/1987 | EP0216527A2 Methods and apparatus for well completion operations |
| 04/01/1987 | EP0216417A2 Packer and service tool assembly |
| 03/24/1987 | US4651822 Dump and kill valve for a sidepocket mandrel |
| 03/24/1987 | US4651818 Metal seal tubing plug |
| 03/17/1987 | US4650001 Assembly for reducing the force applied to a slot and lug guide |
| 03/10/1987 | US4648457 Injection control device for subterranean well conduit |
| 03/10/1987 | US4648454 Robot |
| 03/10/1987 | US4648448 Packer assembly |
| 03/10/1987 | US4648446 Wireline set/tubing retrieve packer type bridge plug |
| 03/10/1987 | US4648445 For retrieving and releasing a downhole tool |
| 03/03/1987 | US4646856 Downhole motor assembly |
| 03/03/1987 | US4646855 Method for raising and lowering a drill string in a wellbore during drilling operations |
| 03/03/1987 | US4646842 Retrievable well bore assembly |
| 03/03/1987 | US4646839 Method and apparatus for through-the-flowline gravel packing |
| 03/03/1987 | US4646829 Hydraulically set and released bridge plug |
| 03/03/1987 | US4646828 Apparatus for enhanced oil recovery |
| 02/25/1987 | EP0211725A1 Device for positioning a tool in a drain pipe of a drilled well |
| 02/25/1987 | CN86105318A Borehole seismic receiver |
| 02/24/1987 | CA1218297A1 Well apparatus |
| 02/10/1987 | CA1217716A Rotatable liner arrangement with tandem cone liner hanger |
| 02/03/1987 | US4640354 Method for actuating a tool in a well at a given depth and tool allowing the method to be implemented |
| 02/03/1987 | US4640350 Kickover tool |