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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05/18/1998 | CA2220779A1 Retrievable whipstock |
05/13/1998 | EP0841464A2 Bore selector for a subsea wellhead |
05/13/1998 | EP0840834A1 Apparatus and process for drilling and completing multiple wells |
05/12/1998 | US5749419 Completion apparatus and method |
05/07/1998 | WO1998019042A2 Method and apparatus to isolate a formation zone |
05/06/1998 | EP0839255A1 Safeguarded method and apparatus for fluid communication using coiled tubing, with application to drill stem testing |
05/05/1998 | US5746582 Through-tubing, retrievable downhole submersible electrical pump and method of using same |
04/29/1998 | EP0837978A1 Single trip whipstock assembly |
04/28/1998 | US5743331 Wellbore milling system |
04/28/1998 | CA2028723C Hydraulic running and release tool with mechanical emergency release |
04/28/1998 | CA2011113C Multiple purpose liner hanger construction |
04/23/1998 | WO1998016720A1 Constant bottom contact thruster |
04/21/1998 | US5740864 Method of placement of a whipstock in a wellbore |
04/21/1998 | US5740860 Side pocket mandrel for a measuring instrument |
04/16/1998 | WO1998015850A1 Method of obtaining improved geophysical information about earth formations |
04/14/1998 | US5738178 Method and apparatus for navigational drilling with a downhole motor employing independent drill string and bottomhole assembly rotary orientation and rotation |
04/11/1998 | CA2217596A1 Apparatus and method for borehole seismic exploration |
04/09/1998 | WO1998014685A2 Improved emergency release tool |
04/09/1998 | WO1997048880A3 Downhole apparatus |
04/08/1998 | EP0834643A2 Method and apparatus for drilling and re-entering multiple lateral branches in a well |
04/08/1998 | CA2217507A1 Running and setting tool for packers |
04/07/1998 | US5735357 Apparatus for and method of directional drilling |
04/07/1998 | US5735350 Methods and systems for subterranean multilateral well drilling and completion |
04/07/1998 | US5735345 Shear-out landing adapter |
03/31/1998 | US5732777 Well tubing suspension and rotator system |
03/31/1998 | US5732773 Non-welded bore selector assembly |
03/26/1998 | WO1998012418A2 Autonomous downhole oilfield tool |
03/26/1998 | WO1998012413A2 Wellbore milling system |
03/24/1998 | US5730235 Method and apparatus for removing material from a hole in a strata for use in forcing a member into material comprising or underlying this strata |
03/24/1998 | US5730224 Slidable access control device for subterranean lateral well drilling and completion |
03/24/1998 | US5730219 Production wells having permanent downhole formation evaluation sensors |
03/19/1998 | WO1998010899A1 Granular particle gripping surface |
03/18/1998 | EP0828922A1 Actuating ball |
03/18/1998 | EP0828921A2 Activating means for drilling apparatus |
03/18/1998 | EP0828920A1 A simplified sealing and anchoring device for a well tool |
03/17/1998 | US5727632 Top release retrievable bridge plug or packer and method of releasing and retrieving |
03/05/1998 | WO1998009048A1 Re-entry tool for use in a multilateral well |
03/05/1998 | WO1998009047A1 Coiled tubing entry guide |
03/05/1998 | CA2233216A1 Coiled tubing entry guide |
03/04/1998 | CN1175301A Method of extracting a hollow unit laid in the ground |
03/03/1998 | US5722489 Multipurpose drilling tool |
03/03/1998 | US5722488 Apparatus for downhole drilling communications and method for making and using the same |
02/25/1998 | EP0825328A2 Apparatus for formation testing |
02/25/1998 | EP0824630A1 Mechanism for anchoring a well tool |
02/24/1998 | US5720349 For wellbore milling operations |
02/24/1998 | US5720343 For use in a subterranean well |
02/19/1998 | WO1998006927A1 Traction apparatus |
02/17/1998 | US5718291 Downhole disconnect tool |
02/12/1998 | WO1998005845A1 Method for forming a casing window |
02/12/1998 | CA2232941A1 Method for forming a casing window |
02/11/1998 | CN2274253Y 孔定位器 Hole Locator |
02/10/1998 | US5715891 Method for isolating multi-lateral well completions while maintaining selective drainhole re-entry access |
02/10/1998 | CA2153005C Methods of inserting tubing into live wells |
02/10/1998 | CA2122958C Hydraulic disconnect |
02/05/1998 | WO1998004806A1 Plug comprising a disc valve |
02/05/1998 | WO1998004804A1 Apparatus and method for milling a hole in casing |
02/03/1998 | CA2080970C Short stroke casing valve with positioning and jetting tools therefor |
01/22/1998 | WO1998002638A1 Apparatus and method for performing imaging and downhole operations at work site in wellbores |
01/22/1998 | WO1998002635A1 Method for accelerating production-c-i-p |
01/22/1998 | WO1998002634A1 Downhole tool and method |
01/17/1998 | CA2209874A1 Improved thru tubing whipstock and method |
01/15/1998 | WO1998001651A1 Wellbore tractor |
01/15/1998 | DE19627719A1 Downhole transmitter producing coded pressure pulse signals from measured data |
01/13/1998 | US5706892 Downhole tools for production well control |
01/13/1998 | US5706891 Gravel pack mandrel system for water-flood operations |
01/08/1998 | WO1998000626A1 Method for expanding a steel tubing and well with such a tubing |
01/07/1998 | EP0815344A1 Whipstock |
01/07/1998 | EP0815343A1 Flow control tool |
01/06/1998 | US5704437 Method of enhancing production from a well |
01/06/1998 | US5704426 Zonal isolation method and apparatus |
01/06/1998 | US5704425 For use in a multilevel borehole monitoring system |
01/06/1998 | US5704393 Coiled tubing apparatus |
12/30/1997 | US5701954 For use in a subterranean well |
12/29/1997 | EP0670013B1 Stabilized speed control system for a hydrostatic transmission |
12/24/1997 | WO1997048880A2 Downhole apparatus |
12/23/1997 | US5700968 Perforating gun brake |
12/23/1997 | US5699858 Well pumping system and installation method |
12/18/1997 | WO1997047850A1 Multi-cycle circulating sub |
12/16/1997 | US5697449 Apparatus and method for temporary subsurface well sealing and equipment anchoring |
12/16/1997 | US5697445 Method and apparatus for selective horizontal well re-entry using retrievable diverter oriented by logging means |
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 | WO1997046788A1 Downhole anchor |
12/11/1997 | WO1997046787A1 A hydraulic device to be connected in a pipe string |
12/10/1997 | EP0811747A2 Downhole tool and method for use of the same |
12/09/1997 | US5695009 Downhole oil well tool running and pulling with hydraulic release using deformable ball valving member |
12/09/1997 | CA2106699C Coiled tubing inflatable packer with circulating port |
12/05/1997 | CA2206916A1 Fluid pressure deactivated thru-tubing centralizer |
12/04/1997 | WO1997045619A1 Multicut window mill |
12/03/1997 | EP0810348A2 Up-to-set lock mandrel and method of operation thereof |
12/02/1997 | US5692564 Horizontal inflation tool selective mandrel locking device |
12/01/1997 | CA2177762A1 Downhole anchor |
11/29/1997 | CA2206170A1 Up-to-set-lock mandrel with no-go key structure and method of operation thereof |
11/26/1997 | EP0808436A1 Method of extracting a hollow unit laid in the ground |
11/25/1997 | US5690172 Seal-sub packer and a setting tool therefor |
11/19/1997 | EP0807201A1 Multiple drain drilling and production apparatus |
11/18/1997 | CA2034962C Downhole force generator |
11/18/1997 | CA2014217C Drill rod retrieval device |
11/13/1997 | WO1997028349A3 Downhole valve |
11/11/1997 | US5686674 System for characterizing surfaces of pipes, ducts or similar structures |
11/11/1997 | US5685574 Snap latch seal locator for sealingly latching tubing to a packer in a wellbore |