Patents
Patents for E21B 23 - Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells (12,712)
05/1998
05/18/1998CA2220779A1 Retrievable whipstock
05/13/1998EP0841464A2 Bore selector for a subsea wellhead
05/13/1998EP0840834A1 Apparatus and process for drilling and completing multiple wells
05/12/1998US5749419 Completion apparatus and method
05/07/1998WO1998019042A2 Method and apparatus to isolate a formation zone
05/06/1998EP0839255A1 Safeguarded method and apparatus for fluid communication using coiled tubing, with application to drill stem testing
05/05/1998US5746582 Through-tubing, retrievable downhole submersible electrical pump and method of using same
04/1998
04/29/1998EP0837978A1 Single trip whipstock assembly
04/28/1998US5743331 Wellbore milling system
04/28/1998CA2028723C Hydraulic running and release tool with mechanical emergency release
04/28/1998CA2011113C Multiple purpose liner hanger construction
04/23/1998WO1998016720A1 Constant bottom contact thruster
04/21/1998US5740864 Method of placement of a whipstock in a wellbore
04/21/1998US5740860 Side pocket mandrel for a measuring instrument
04/16/1998WO1998015850A1 Method of obtaining improved geophysical information about earth formations
04/14/1998US5738178 Method and apparatus for navigational drilling with a downhole motor employing independent drill string and bottomhole assembly rotary orientation and rotation
04/11/1998CA2217596A1 Apparatus and method for borehole seismic exploration
04/09/1998WO1998014685A2 Improved emergency release tool
04/09/1998WO1997048880A3 Downhole apparatus
04/08/1998EP0834643A2 Method and apparatus for drilling and re-entering multiple lateral branches in a well
04/08/1998CA2217507A1 Running and setting tool for packers
04/07/1998US5735357 Apparatus for and method of directional drilling
04/07/1998US5735350 Methods and systems for subterranean multilateral well drilling and completion
04/07/1998US5735345 Shear-out landing adapter
03/1998
03/31/1998US5732777 Well tubing suspension and rotator system
03/31/1998US5732773 Non-welded bore selector assembly
03/26/1998WO1998012418A2 Autonomous downhole oilfield tool
03/26/1998WO1998012413A2 Wellbore milling system
03/24/1998US5730235 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
03/24/1998US5730224 Slidable access control device for subterranean lateral well drilling and completion
03/24/1998US5730219 Production wells having permanent downhole formation evaluation sensors
03/19/1998WO1998010899A1 Granular particle gripping surface
03/18/1998EP0828922A1 Actuating ball
03/18/1998EP0828921A2 Activating means for drilling apparatus
03/18/1998EP0828920A1 A simplified sealing and anchoring device for a well tool
03/17/1998US5727632 Top release retrievable bridge plug or packer and method of releasing and retrieving
03/05/1998WO1998009048A1 Re-entry tool for use in a multilateral well
03/05/1998WO1998009047A1 Coiled tubing entry guide
03/05/1998CA2233216A1 Coiled tubing entry guide
03/04/1998CN1175301A Method of extracting a hollow unit laid in the ground
03/03/1998US5722489 Multipurpose drilling tool
03/03/1998US5722488 Apparatus for downhole drilling communications and method for making and using the same
02/1998
02/25/1998EP0825328A2 Apparatus for formation testing
02/25/1998EP0824630A1 Mechanism for anchoring a well tool
02/24/1998US5720349 For wellbore milling operations
02/24/1998US5720343 For use in a subterranean well
02/19/1998WO1998006927A1 Traction apparatus
02/17/1998US5718291 Downhole disconnect tool
02/12/1998WO1998005845A1 Method for forming a casing window
02/12/1998CA2232941A1 Method for forming a casing window
02/11/1998CN2274253Y 孔定位器 Hole Locator
02/10/1998US5715891 Method for isolating multi-lateral well completions while maintaining selective drainhole re-entry access
02/10/1998CA2153005C Methods of inserting tubing into live wells
02/10/1998CA2122958C Hydraulic disconnect
02/05/1998WO1998004806A1 Plug comprising a disc valve
02/05/1998WO1998004804A1 Apparatus and method for milling a hole in casing
02/03/1998CA2080970C Short stroke casing valve with positioning and jetting tools therefor
01/1998
01/22/1998WO1998002638A1 Apparatus and method for performing imaging and downhole operations at work site in wellbores
01/22/1998WO1998002635A1 Method for accelerating production-c-i-p
01/22/1998WO1998002634A1 Downhole tool and method
01/17/1998CA2209874A1 Improved thru tubing whipstock and method
01/15/1998WO1998001651A1 Wellbore tractor
01/15/1998DE19627719A1 Downhole transmitter producing coded pressure pulse signals from measured data
01/13/1998US5706892 Downhole tools for production well control
01/13/1998US5706891 Gravel pack mandrel system for water-flood operations
01/08/1998WO1998000626A1 Method for expanding a steel tubing and well with such a tubing
01/07/1998EP0815344A1 Whipstock
01/07/1998EP0815343A1 Flow control tool
01/06/1998US5704437 Method of enhancing production from a well
01/06/1998US5704426 Zonal isolation method and apparatus
01/06/1998US5704425 For use in a multilevel borehole monitoring system
01/06/1998US5704393 Coiled tubing apparatus
12/1997
12/30/1997US5701954 For use in a subterranean well
12/29/1997EP0670013B1 Stabilized speed control system for a hydrostatic transmission
12/24/1997WO1997048880A2 Downhole apparatus
12/23/1997US5700968 Perforating gun brake
12/23/1997US5699858 Well pumping system and installation method
12/18/1997WO1997047850A1 Multi-cycle circulating sub
12/16/1997US5697449 Apparatus and method for temporary subsurface well sealing and equipment anchoring
12/16/1997US5697445 Method and apparatus for selective horizontal well re-entry using retrievable diverter oriented by logging means
12/11/1997WO1997046791A1 Method and device for facilitating the insertion of a coiled tube into a well and for loosening stuck objects in a well
12/11/1997WO1997046788A1 Downhole anchor
12/11/1997WO1997046787A1 A hydraulic device to be connected in a pipe string
12/10/1997EP0811747A2 Downhole tool and method for use of the same
12/09/1997US5695009 Downhole oil well tool running and pulling with hydraulic release using deformable ball valving member
12/09/1997CA2106699C Coiled tubing inflatable packer with circulating port
12/05/1997CA2206916A1 Fluid pressure deactivated thru-tubing centralizer
12/04/1997WO1997045619A1 Multicut window mill
12/03/1997EP0810348A2 Up-to-set lock mandrel and method of operation thereof
12/02/1997US5692564 Horizontal inflation tool selective mandrel locking device
12/01/1997CA2177762A1 Downhole anchor
11/1997
11/29/1997CA2206170A1 Up-to-set-lock mandrel with no-go key structure and method of operation thereof
11/26/1997EP0808436A1 Method of extracting a hollow unit laid in the ground
11/25/1997US5690172 Seal-sub packer and a setting tool therefor
11/19/1997EP0807201A1 Multiple drain drilling and production apparatus
11/18/1997CA2034962C Downhole force generator
11/18/1997CA2014217C Drill rod retrieval device
11/13/1997WO1997028349A3 Downhole valve
11/11/1997US5686674 System for characterizing surfaces of pipes, ducts or similar structures
11/11/1997US5685574 Snap latch seal locator for sealingly latching tubing to a packer in a wellbore