Patent ID: 8469088
Filing Date: 2013-06-25
Classification: E21B

Abstract:
1. A drillable bridge plug comprising: a mandrel having an upper end and a lower end, wherein the lower end comprises external splines disposed on an outer surface of the mandrel; a sealing element disposed around the mandrel; an upper cone disposed around the mandrel proximate an upper end of the sealing element; a lower cone disposed around the mandrel proximate the lower end of the sealing element, wherein an inner surface of the lower cone comprises internal splines configured to engage the external splines; an upper slip assembly disposed around the mandrel adjacent a sloped surface of the upper cone; a lower slip assembly disposed around the mandrel adjacent a sloped surface of the lower cone; an upper ring assembly comprising a first upper segmented barrier ring, a second upper segmented barrier ring, and an upper back-up ring disposed proximate the upper end of the sealing element and positioned between the upper end of the sealing element and the upper cone, wherein a plurality of segments disposed in the first upper segmented barrier ring are radially offset with respect to a plurality of segments disposed in the second upper segmented barrier ring; a lower ring assembly comprising a first lower segmented barrier ring, a second lower segmented barrier ring, and a lower back-up ring disposed proximate the lower end of the sealing element and positioned between the lower end of the sealing element and the lower cone, wherein a plurality of segments disposed in the first lower segmented barrier ring are radially offset with respect to a plurality of segments disposed in the second lower segmented barrier ring; and a bottom sub.