With Means To Prevent Preliminary Bore Fluid Contact Patents (Class 175/4.59)
  • Patent number: 8943944
    Abstract: This invention provides a structure for gunpowder charge in multi-frac composite perforation devices that is easy to assemble and transport while the charge volume of gunpowder is increased. In one embodiment of the present invention, an triplet outer gunpowder box is attached onto the outer wall of the charge frame and comprises one middle gunpowder box charged with gunpowder of certain burning rate, and two side-hung gunpowder boxes charged with gunpowder of another burning rate. The two side-hung gunpowder boxes are separately located on the two sides of the middle gunpowder box and are connected with the middle gunpowder box as a unit. The middle gunpowder box is located at a position corresponding to the perforating charge, and has an inner groove for orienting the perforating charge and a through hole through which the jet flow passes.
    Type: Grant
    Filed: December 14, 2012
    Date of Patent: February 3, 2015
    Assignees: Tong Oil Tools Co., Ltd, Tong Petrotech Inc
    Inventors: Guoan Zhang, Jianlong Cheng, Xianhong Sun
  • Patent number: 8943943
    Abstract: Explosive carrier end plates for charge-carriers utilized in guns for the perforation of petroleum producing wells. Each gun is mounted coupled vertically with similar guns inside the casing of the well, and each gun is a hollow cylinder in the interior of which there is a corresponding tubular carrier that has multiple peripheral mountings for a radial placement of the shaped-charges. The carrier is mounted in the gun by means of a top insulating end plate that has a retractable electrical spring contact capable of pushing upwards, and a bottom insulating end plate. The end plates have a centering clip for anchoring in a respective window of the cylindrical wall of the carrier. Both end plates have a single removable insert axially fitted between two tubular inserts, which present reciprocal guiding and positioning means for a pin-keyway slot to enable mounting with the end plate.
    Type: Grant
    Filed: November 9, 2012
    Date of Patent: February 3, 2015
    Assignee: Tassaroli S.A.
    Inventor: Carlos Jose Tassaroli
  • Patent number: 8763507
    Abstract: An isolation sub for use in a perforating system that includes a pressure activated firing head. The isolation sub is set between the pressure source that is used to initiate the firing head. A pressure regulator in the sub is responsive to fluctuations in pressure difference between the pressure source and wellbore and isolates the firing head when the pressure difference is at or approaches a designated pressure difference that could initiate the firing head. The pressure regulator includes a spring loaded piston that seals the firing head from the source pressure before the pressure difference activates the firing head.
    Type: Grant
    Filed: October 21, 2011
    Date of Patent: July 1, 2014
    Assignee: Baker Hughes Incorporated
    Inventor: Colby W. Ross
  • Patent number: 6557650
    Abstract: A method and apparatus to protect explosive components used in various tools, such as tools for use in wellbores, includes a component with an adsorptive material. Example tools include perforating gun strings that include shaped charges, detonating cords, and booster explosives. Other tools may include surface tools containing explosive components. The adsorptive material is placed inside a container. A temperature-activated mechanism is used to open the container. The temperature-activated mechanism includes an element formed of a shape memory metal or plural layers with different coefficients of thermal expansion, such as a bi-metallic strip.
    Type: Grant
    Filed: November 13, 2001
    Date of Patent: May 6, 2003
    Assignee: Schlumberger Technology Corp.
    Inventors: Alfredo Fayard, Wenbo Yang, Anthony F. Veneruso
  • Patent number: 6386296
    Abstract: A method and apparatus to protect explosive components used in various tools, such as tools for use in wellbores, includes a component with an adsorptive material. Example tools include perforating gun strings that include shaped charges, detonating cords, and booster explosives. Other tools may include surface tools containing explosive components. In these tools, a build up of corrosive gases or liquids may occur, which may cause damage to the explosive components. As a result, the structural integrity or reliability and thermal stability may be weakened or reduced. To reduce the amount of build up of corrosive gases or liquids, an adsorptive material is placed inside tools in the proximity of explosive components.
    Type: Grant
    Filed: June 19, 2000
    Date of Patent: May 14, 2002
    Assignee: Schlumberger Technology Corporation
    Inventors: Manish Kothari, Wenbo Yang, Alfredo Fayard, Anthony F. Veneruso, Larry A. Behrmann, Jack F. Lands, Claude D. Jones