Removable fracturing plug of particulate material housed in a sheath set by relative end movement of the sheath

摘要

The removable plug features a solid material that is housed in a porous container that has its shape changed to transition from the run in shape to the set shape. A running string and setting tool that creates relative movement deliver the plug and pull on its lower end while holding the top stationary against a backing plate. The container is pulled into itself as the radial dimension grows for the set. There can be a mandrel that remains in position and can lock to the backing plate or alternatively there can be no mandrel or a removable mandrel. The porous container can be removed in a variety of ways to let the solid material escape to be removed with fluid circulating in the wellbore. Alternatively the mandrel can be undermined to let the solid material escape for recovery.

主权项

1. A plug for subterranean use between zones where flow between said zones is to be minimized, comprising:
an annularly shaped porous sheath having an upper and a lower end when run in and having a fill material therein and defining a passage therethrough, said passage extending between said ends and a mandrel extending in said passage; said sheath having a run in configuration when said upper and lower ends are spaced apart from each other at a predetermined distance and a set position when said lower end at run in is moved into said passage to define a new lower end for said sheath that is closer to said upper end, wherein fluid is pushed out of said sheath during movement from said run in to said set position.