RELEASE TOOL FOR A DRILL STRING INSIDE BLOWOUT PREVENTER

摘要

Inside blowout preventer release tool body having a one-piece planar upper section and a one-piece tubular lower section. In one embodiment, the upper section includes a pair of longitudinal members defining a central open region, the longitudinal members joined at one end having a formed lifting feature configured to accept a manipulator cable or chain. The lifting feature is positioned such that when the release tool body and an inside blowout preventer connected thereto are lifted by the rig hoist using cables, chains, and the like, they are easily moved over, aligned with, and connected with a working drillpipe while minimizing possibility of slipping off the cables or chains. The lower section includes a threaded end mating with a mating end of an inside blowout preventer, a central longitudinal bore to accept a release rod, and an upper end formed to accept the lower ends of the longitudinal members of the upper section. In one embodiment, elongate slots in each longitudinal member define one or more manipulating handles for a rig worker, machine, or tool. In other embodiments a pair of generally horizontal hand holds are defined in each longitudinal member.

主权项

1. A modular release tool body for use with inside blowout preventers comprising:
a one-piece, formed, planar metallic upper section having a longitudinal axis, the upper section comprising a pair of longitudinal members defining a central open region, each longitudinal member having a lower end, the longitudinal members joined by a top manipulating end having one or more lifting features formed therein configured to accept one or more manipulators, the one or more formed lifting features positioned such that when the release tool body and an inside blowout preventer connected thereto are lifted by the one or more manipulators, they are easily moved over, aligned with, and connected with a working drillpipe while minimizing possibility of the manipulators slipping off; and a one-piece, formed, tubular metallic lower section removably attached to the upper section having the same longitudinal axis as the upper section, the lower section comprising a threaded end for threadedly mating with an end of an inside blowout preventer;
a central longitudinal bore configured to slidingly accept a release rod;an upper end formed to accept the lower ends of the longitudinal members of the upper section and retaining members therefore;the upper end further formed to comprise a central axial extension comprising one or more fluid outlets fluidly connected with the central longitudinal bore, the central axial extension of length sufficient to accommodate an internally threaded bore substantially perpendicular to and intersecting the central longitudinal bore, and accept a mating threaded release rod lock screw therein.