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Retrieval tool for back pressure valve and tree test plug

  • US 5,782,297 A
  • Filed: 08/19/1996
  • Issued: 07/21/1998
  • Est. Priority Date: 08/19/1996
  • Status: Expired due to Fees
First Claim
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1. A retrieval tool assembly for retrieving a valve comprising:

  • a tool body having a first end and a second end;

    said first end being adapted to receive means for grasping and manipulating said tool body;

    a stem connected to said second end;

    a spear comprising a generally ring-shaped base and a plurality of resilient fingers extending therefrom and having free ends opposite said base, said base being positioned generally concentrically around said stem such that said fingers extend toward said second end of said body;

    said stem comprising integral retaining means adapted to retain said spear on said stem while permitting limited axial movement of said spear on said stem;

    wedge means releasably fixed to said stem for engagement with an inner surface on each of said fingers when said body and said stem are moved relative to said spear, whereby said wedge means bias said fingers radially outward when said spear is moved axially relative to said body and said stem;

    each said finger comprising engagement means extending radially outwardly for engaging an annular retrieval groove on an inner circumferential surface of said valve when said tool assembly is inserted concentrically in said valve; and

    shear means for releasably fixing said wedge means to said stem, said shear means being adapted to shear and release said wedge means from said stem, causing said wedge means to fall out of engagement with said inner surfaces when an axial force imposed on said wedge means attributable to said relative axial movement between said body, said stem, and said spear reaches a predetermined limit, whereby continued relative movement causes said retaining means to contact said spear and cause said spear to move with said body and said stem;

    wherein said tool body comprises an axial recess formed in said second end, an end of said stem is received in said axial recess and the retaining means is formed adjacent the distal end of said stem.

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