Patent ID: 9284813
Filing Date: 2016-03-15
CPC Classification: E21B

Claim Text:
1. A seal stack, comprising: a sealing element including an annular seal ring having a diameter and an axis defined therethrough perpendicular to said diameter, a groove defined in said seal ring, wherein said groove has an opening at a first end of said seal ring; and a swellable energizer disposed in said groove, wherein said swellable energizer swells upon exposure to a solvent causing said seal ring to expand; and a first annular back-up and a second annular back-up provided at opposing ends of said sealing element, wherein said first back-up includes an interior surface that receives a second end of said sealing element; wherein: said opening is at least partially defined by projections extending past said swellable energizer; and at least one of said projections comprises an internal surface proximate an outer surface of said swellable energizer, said internal surface comprising a circumferential passage extending radially around said groove, the circumferential passage defining a space between said swellable energizer and said at least one internal surface.