Assembly and method for wide catch overshot

摘要

A grapple for use in an overshot has a tension ring with a reduced helix diameter but the helix diameter is not reduced on either sides of the control finger slot. One embodiment includes expansion blades on the inner diameter (“ID”) of the tension ring to allow the grapple to expand substantially before the fish reaches the segments. An embodiment provides for a control with an offset finger to allow the guide thread ID to be smaller than the bowl helix major ID. Also provided is grapple control for a spiral grapple that has at least one gap to allow the grapple control to be more compliant during fishing operations. The control may include one or more bridges of reduced thickness. Alternate embodiments include gaps and support bands with or without bridges and/or a backup ring to help eliminate misalignment of the grapple control with the support shoulder of the overshot guide.

主权项

1. An overshot comprising:
a bowl having a bore therethrough; a spiral grapple placed inside the bore of the bowl, the grapple comprising a grapple key; a grapple control comprising
a ring member having an inner diameter and an outer diameter, at least one gap, and at least one bridge, wherein said bridge has a reduced outer diameter than said outer diameter of said ring member, anda finger extending from the ring member, for engaging said spiral grapple; and a guide, wherein, when in use, the grapple control is deformed and said deforming is allowed for by the gap.