| Patents for E21B 31 - Fishing for or freeing objects in boreholes or wells (3,788) |
|---|
| 03/28/2007 | CN2883659Y Testing fisher |
| 03/28/2007 | CN2883658Y Downhole broken articles catch sleeve |
| 03/28/2007 | CN1936266A Oil-well low-frequency acoustic vibration unblocking and yield-increasing apparatus and method |
| 03/27/2007 | US7195069 Method and apparatus for backing off a tubular member from a wellbore |
| 03/21/2007 | CN2881062Y Drill rod circulation well washing apparatus |
| 03/20/2007 | US7191852 Energy accelerator |
| 03/20/2007 | US7191840 Casing running and drilling system |
| 03/15/2007 | WO2007030336A2 C-plate assembly for use in a cable guided fishing assembly |
| 03/15/2007 | WO2007030293A2 Cable hanger for use in a cable guided fishing assembly |
| 03/15/2007 | WO2007030262A2 Spear head overshot for use in a cable guided fishing assembly |
| 03/15/2007 | US20070057522 Tool to pick up microparts |
| 03/15/2007 | CA2621069A1 Spear head overshot for use in a cable guided fishing assembly |
| 03/15/2007 | CA2621052A1 C-plate assembly for use in a cable guided fishing assembly |
| 03/13/2007 | US7188675 Finger boot basket |
| 03/07/2007 | CN2876316Y Permanent magnet autonomous vibration deblocking and yield increasing equipment |
| 03/07/2007 | CN2876315Y Oil well low frequency sound wave vibration deblocking and yield increasing equipment |
| 03/01/2007 | US20070046051 Spear head overshot for use in a cable guided fishing assembly |
| 03/01/2007 | US20070044971 C-plate assembly for use in a cable guided fishing assembly |
| 03/01/2007 | US20070044970 Cable hanger for use in a cable guided fishing assembly |
| 02/28/2007 | CN1920240A Reverse buckling equipment |
| 02/22/2007 | WO2007019594A1 Method and device for releasing a block on a bore-crown during a boring process |
| 02/21/2007 | CN2871816Y Eccentric-pipeline connected-hoop fishing drum |
| 02/21/2007 | CN2871815Y Hydraulic low-frequency pulsing impactor |
| 02/21/2007 | CN2871814Y Release-adjusting limiting mechanism of impactor |
| 02/21/2007 | CN2871813Y Fishing equipment of cable callipers and iron protector |
| 02/21/2007 | CN2871791Y Borehole expander |
| 02/15/2007 | US20070035141 Lifting magnet |
| 02/15/2007 | US20070034372 Internal release connector and method |
| 02/14/2007 | CN2869293Y Clamping-tooth-free oil pipe fishing spear |
| 02/14/2007 | CN2869292Y Sucker-rod pump oil well falling-matter collector |
| 02/14/2007 | CN2869291Y Telescopic high magneticneedle irregular fisher |
| 02/14/2007 | CN1912333A Gear barrel |
| 02/14/2007 | CN1300441C Well washing method of hierarchical water injection well and its underwell tubular column |
| 02/13/2007 | US7174957 Magnetic bailer |
| 02/13/2007 | CA2306736C Downhole packer system |
| 02/01/2007 | WO2007014006A1 Internal release connector and method |
| 01/31/2007 | CN2864083Y Lifting-putting fishing tool capable of withdrawing |
| 01/31/2007 | CN2864082Y Integrative kick milling shoe |
| 01/31/2007 | CN2864081Y Abnormal magnetic-iron overshot |
| 01/24/2007 | CN2861461Y Salvage cylinder with shoulder |
| 01/24/2007 | CN1902374A Field adjustable impact jar |
| 01/24/2007 | CN1296598C Rope salvaging type debris-discharge repetition-free drilling and forming hole method and machine tool |
| 01/23/2007 | US7165609 Apparatus for handling tubular goods |
| 01/18/2007 | WO2007006137A1 Downhole force generator |
| 01/18/2007 | US20070012457 Underbalanced drilling applications hydraulically operated formation isolation valve |
| 01/18/2007 | CA2614980A1 Downhole force generator |
| 01/17/2007 | CN2858930Y Electronic multiple point measuring device salvaging contrivance |
| 01/17/2007 | CN1295420C Method for deblocking blocked pipe for extracting mirabilite ore deposit by using water soluble method and its equipment |
| 01/16/2007 | US7163059 Method for releasing stuck drill string |
| 01/16/2007 | US7163058 Hydraulic jar device |
| 01/10/2007 | CN2856390Y Low water resistance hole gauge |
| 01/10/2007 | CN2856389Y Multifunction hydraulic fisher for small dropped article |
| 01/10/2007 | CN1891973A Hydraulic jar coupling during drilling with mechanical locking mechanism |
| 01/09/2007 | CA2305299C Gas-filled accelerator |
| 01/04/2007 | WO2007001187A1 Impact hammer for coiled tubing drilling |
| 01/03/2007 | CN2854060Y Stuck releasing jar of water injection well test regulation tool |
| 01/02/2007 | US7156373 Line retrieval system |
| 12/27/2006 | CN2851537Y Hydraulic and mechanical type bumper jar while drilling |
| 12/27/2006 | CN1292146C Pump device with double-cone unit and its usage method |
| 12/21/2006 | WO2006135787A1 Casing and drill pipe filling and circulation apparatus |
| 12/20/2006 | CN2849134Y New type fishing tool |
| 12/20/2006 | CN2849133Y Servopump pulse resonant unlocking yield increasing device |
| 12/13/2006 | EP1334257B1 Jar with electrical conductor |
| 12/06/2006 | CN2844408Y Spiral guider |
| 12/06/2006 | CN1288325C Device for catching object in well |
| 11/30/2006 | US20060266205 Explosive pipe severing tool |
| 11/29/2006 | CN2841945Y Locking external-hook fishing spear |
| 11/28/2006 | CA2336905C Downhole tension swivel sub |
| 11/23/2006 | US20060260801 Wired Tool String Component |
| 11/22/2006 | EP1723307A1 A jar for use in a downhole toolstring |
| 11/21/2006 | US7137454 Apparatus for facilitating the connection of tubulars using a top drive |
| 11/21/2006 | US7137449 Magnet arrangement and method for use on a downhole tool |
| 11/16/2006 | US20060255607 Elevator safety lifting support |
| 11/15/2006 | CN1284750C Pyrotechnic composition for thermal pipe cutter and process for making same |
| 11/14/2006 | CA2383929C Hydraulically driven fishing jars |
| 11/08/2006 | CN2835536Y Hook type fishing tool for whipstock |
| 11/08/2006 | CN2835535Y Wash-over fishing tool |
| 11/02/2006 | WO2006116094A1 Downhole vibratory tool |
| 11/02/2006 | US20060243447 Field Adjustable Impact Jar |
| 11/01/2006 | CN2833095Y Rapid coupler for oil well tools |
| 10/25/2006 | CN2830632Y Hydraulic struck releasing device while drilling |
| 10/24/2006 | US7124838 Gripping assembly for impact hammer |
| 10/18/2006 | CN1847610A Jamming preventing protector |
| 10/12/2006 | WO2006107215A1 Method and means for providing time delay in downhole well operations |
| 10/12/2006 | US20060226668 Apparatus for delivering a tool into a submerged bore |
| 10/12/2006 | CA2604029A1 Method and means for providing time delay in downhole well operations |
| 10/11/2006 | EP1412616B1 Dual sensor freepoint tool |
| 10/10/2006 | US7117939 Percussion hammer bit retainer apparatus |
| 10/04/2006 | CN2823534Y Horizontal well sand-proof pipe string drifting fishing tool |
| 10/03/2006 | US7114563 Tubing or drill pipe conveyed downhole tool system with releasable wireline cable head |
| 09/28/2006 | WO2006102622A1 Magnetic tool for retrieving metal objects from a well bore when using coil tubing |
| 09/28/2006 | WO2005104701A3 Spotting fluid for use with oil-based muds and method of use |
| 09/27/2006 | EP1356009A4 Spotting fluid for differential sticking |
| 09/26/2006 | US7111678 Field adjustable impact jar |
| 09/20/2006 | CN2818766Y Fishing lance |
| 09/20/2006 | CN2818765Y Fishing cylinder of explisive lever |
| 09/20/2006 | CN2818764Y Fishing sleeve |
| 09/19/2006 | US7108065 Technique for preventing deposition products from impeding the motion of a movable component |
| 09/13/2006 | CN2816338Y Device for fishing drops underground |
| 09/07/2006 | US20060196679 Apparatus for radially expanding and plastically deforming a tubular member |