Patent ID: 8276670
Filing Date: 2012-10-02
Classification: E21B

Abstract:
1. A downhole plug, comprising: a housing having an aperture disposed generally through the center of the housing, a stopper having a composition of at least two different materials, one or more covers at least partially disposed on the stopper, wherein the stopper is at least partially encapsulated by the one or more covers, and wherein the stopper is disposed in the aperture and adapted to block fluid flow therethrough, a fluid bypass channel formed in the housing and in communication with an exposed portion of the stopper at a fluid introduction point on the stopper, a flow control device disposed within the fluid bypass channel and adapted to selectively introduce a fluid to the exposed portion of the stopper, and a cavity formed between an inner wall of the housing and the exposed portion of the stopper, wherein the cavity and the exposed portion extend along at least a portion of an axial length of the stopper from the fluid introduction point.