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Class Information
Number: 175/4.52
Name: Boring or penetrating the earth > Boring with explosion in inaccessible hole > With wall engaging packer or anchor
Description: Subject matter directed to means engaging the hole wall or a tubular member in the hole to (1) block fluid flow between the explosive apparatus and the hole wall or member or (2) attach the explosive apparatus to the hole wall or other wall in the hole so as to resist the action of gravity or a lifting force.

Patents under this class:
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Patent Number Title Of Patent Date Issued
8579022 Apparatus for deploying and activating a downhole tool Nov. 12, 2013
8397814 Perforating string with bending shock de-coupler Mar. 19, 2013
7721820 Buffer for explosive device May. 25, 2010
7325620 Recoverable, reinforced and vibration-damping plug used for cased wells Feb. 5, 2008
7258054 Continuous explosive charge assembly for use in an elongated cavity Aug. 21, 2007
6901865 Primer casing and method of charging a blasthole Jun. 7, 2005
6805056 Method and apparatus for removing abandoned tubular members Oct. 19, 2004
6722251 Method for loading a continuous explosive charge assembly in an elongated cavity Apr. 20, 2004
6672405 Perforating gun assembly for use in multi-stage stimulation operations Jan. 6, 2004
6595289 Method and apparatus for plugging a wellbore Jul. 22, 2003
6564686 Continuous explosive charge assembly and method for loading same in an elongated cavity May. 20, 2003
6502631 Reinforced borehole plugs Jan. 7, 2003
6386288 Casing conveyed perforating process and apparatus May. 14, 2002
6220370 Circulating gun system Apr. 24, 2001
6142231 One-trip conveying method for packer/plug and perforating gun Nov. 7, 2000
6032739 Method of locating wellbore casing collars using dual-purpose magnet Mar. 7, 2000
5816747 Device for cutting a large diameter pipe and initiation manifold therefor Oct. 6, 1998
5777257 Shaped charge assembly with truncated liner Jul. 7, 1998
5704426 Zonal isolation method and apparatus Jan. 6, 1998
5611401 One-trip conveying method for packer/plug and perforating gun Mar. 18, 1997
5598894 Select fire multiple drill string tester Feb. 4, 1997
5429192 Method and apparatus for anchoring a perforating gun to a casing in a wellbore including a primary and a secondary anchor release mechanism Jul. 4, 1995
5423382 Apparatus for releasing perforating gun equipment from a well casing Jun. 13, 1995
5370186 Apparatus and method of perforating wellbores Dec. 6, 1994
5353875 Methods of perforating and testing wells using coiled tubing Oct. 11, 1994
5295544 Decentralized casing hole puncher Mar. 22, 1994
5211224 Annular shaped power charge for subsurface well devices May. 18, 1993
5191936 Method and apparatus for controlling a well tool suspended by a cable in a wellbore by selective axial movements of the cable Mar. 9, 1993
5191933 Wellbore apparatus including a rathole pressure balanced-differential pressure firing system Mar. 9, 1993
5156213 Well completion method and apparatus Oct. 20, 1992
5131472 Overbalance perforating and stimulation method for wells Jul. 21, 1992
5131470 Shock energy absorber including collapsible energy absorbing element and break up of tensile connection Jul. 21, 1992
5111885 Decentralized casing hole puncher May. 12, 1992
5103911 Method and apparatus for perforating a well liner and for fracturing a surrounding formation Apr. 14, 1992
5103912 Method and apparatus for completing deviated and horizontal wellbores Apr. 14, 1992
5090325 Tunnel driving method Feb. 25, 1992
5067568 Well perforating gun Nov. 26, 1991
5044437 Method and device for performing perforating operations in a well Sep. 3, 1991
5042593 Hydraulically damped detonator for use in perforating oil well tubing Aug. 27, 1991
5016716 Tubing carried perforating gun with insulation jacket May. 21, 1991
4969525 Firing head for a perforating gun assembly Nov. 13, 1990
4924952 Detonating heads May. 15, 1990
4917187 Method and apparatus for hydraulically firing a perforating gun below a set packer Apr. 17, 1990
4901802 Method and apparatus for perforating formations in response to tubing pressure Feb. 20, 1990
4886126 Method and apparatus for firing a perforating gun Dec. 12, 1989
4862964 Method and apparatus for perforating well bores using differential pressure Sep. 5, 1989
4817718 Hydraulically activated firing head for well perforating guns Apr. 4, 1989
4804044 Perforating gun firing tool and method of operation Feb. 14, 1989
RE32755 Accelerated downhole pressure testing Sep. 27, 1988
4756371 Perforation apparatus and method Jul. 12, 1988

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