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Class Information
Number: 166/178
Name: Wells > With jar means for releasing stuck part
Description: Devices comprising an apparatus under the class definition combined with a means for giving a sharp blow to the apparatus or part thereof to free it from the well.










Patents under this class:
1 2 3 4

Patent Number Title Of Patent Date Issued
8657007 Hydraulic jar with low reset force Feb. 25, 2014
8561688 Compact jar for dislodging tools in an oil or gas well Oct. 22, 2013
8550155 Jarring method and apparatus using fluid pressure to reset jar Oct. 8, 2013
8505653 Downhole apparatus Aug. 13, 2013
8499836 Electrically activating a jarring tool Aug. 6, 2013
8453727 Downhole rotational vibrator Jun. 4, 2013
8418758 Jarring tool with micro adjustment Apr. 16, 2013
8408286 Perforating string with longitudinal shock de-coupler Apr. 2, 2013
8397800 Perforating string with longitudinal shock de-coupler Mar. 19, 2013
8365818 Jarring method and apparatus using fluid pressure to reset jar Feb. 5, 2013
8365826 Hydraulically powered fishing tool and method Feb. 5, 2013
8322413 Twin latch wireline retrieval tool Dec. 4, 2012
8256509 Compact jar for dislodging tools in an oil or gas well Sep. 4, 2012
8230912 Hydraulic bidirectional jar Jul. 31, 2012
8225860 Downhole jarring tool with reduced wear latch Jul. 24, 2012
8205690 Dual acting locking jar Jun. 26, 2012
8201629 Staging tool seal arrangement for gas wells Jun. 19, 2012
8191623 Slickline conveyed shifting tool system Jun. 5, 2012
8191626 Downhole jarring tool Jun. 5, 2012
8171988 Stroker tool May. 8, 2012
8151910 Drilling jar Apr. 10, 2012
8109746 Progressing cavity pump/motor Feb. 7, 2012
8074716 Tension-activated fluid bypass device and associated method Dec. 13, 2011
8011427 Double-acting jar Sep. 6, 2011
7980310 Backoff sub and method for remotely backing off a target joint Jul. 19, 2011
7963324 Flow control actuation Jun. 21, 2011
7946348 Rotation tool May. 24, 2011
7905289 Double-acting jar compounder Mar. 15, 2011
7882906 Up-down vibratory drilling and jarring tool Feb. 8, 2011
7874364 Method for jarring with a downhole pulling tool Jan. 25, 2011
7775280 Jars for wellbore operations Aug. 17, 2010
7766087 Methods and apparatus for placement of well equipment Aug. 3, 2010
7753116 Double-acting jar Jul. 13, 2010
7661477 System and method for unsticking a tool stuck in a wellbore Feb. 16, 2010
7533724 Downhole intelligent impact jar and method for use May. 19, 2009
7523786 Apparatus and method for freeing deployment cables stuck in a wellbore Apr. 28, 2009
7510008 Method and apparatus for decreasing drag force of trigger mechanism Mar. 31, 2009
7395862 Combination jar and disconnect tool Jul. 8, 2008
7367397 Downhole impact generator and method for use of same May. 6, 2008
7347287 Hydraulic timing device Mar. 25, 2008
7343977 Translating downhole tool Mar. 18, 2008
7314083 Slow rotation fluid jetting tool for cleaning a well bore Jan. 1, 2008
7311149 Jar with adjustable preload Dec. 25, 2007
7299872 Hydraulic-mechanical jar tool Nov. 27, 2007
7293614 Multiple impact jar assembly and method Nov. 13, 2007
7290604 Downhole tool with pressure balancing Nov. 6, 2007
7281575 Field adjustable impact jar Oct. 16, 2007
7267176 Downhole resettable jar tool with axial passageway and multiple biasing means Sep. 11, 2007
7253745 Corrosion-resistant downhole transmission system Aug. 7, 2007
7219726 Method and apparatus to vibrate a downhole component May. 22, 2007

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