Debris catcher for retrievable barrier

摘要

A basket is attached below a retrievable bridge plug used during the pressure testing of a well to verify integrity prior to fracturing operations. After the pressure integrity test above the plug, the plug is released and retrieved and a series of balls of increasing diameter are dropped on increasingly larger ball seats to allow shifting sleeves to an open position from the heel of the well toward the surface to sequentially frac in that direction. If any segments of the sealing element break off they are captured and removed in the basket that has flow through opening small enough to retain the debris and allow flow through the basket during removal. The basket is slotted for through fluid flow and can have a breakaway for the support rod if the basket sticks when the plug is removed.

主权项

1. A subterranean barrier assembly for a borehole defined by a wall, comprising:
a selectively actuated barrier assembly having an annularly shaped sealing element engageable with the wall, said barrier assembly actuated with a separable setting tool to compress said sealing element and creating internal pressure within said sealing element; said barrier assembly placed uphole of at least one seat to allow performance of a pressure integrity test from a surface location against said barrier assembly when set in the borehole; a debris catcher supported proximately to said barrier assembly to retain falling debris that breaks loose from said sealing element, said debris catcher and said barrier assembly are delivered into the borehole together for the performance of said pressure integrity test whereupon said barrier assembly and said debris catcher are removed from the borehole together to expose said at least one seat to sealingly accept an object for performing a formation pressure treatment; said barrier assembly comprises a travel stop to limit the compression on said sealing element to reduce the formation of fragments of said sealing element to be captured by said debris catcher and protect said seat from said fragments that can interfere with said object sealingly contacting said seat.