Patent ID: 8899316
Filing Date: 2014-12-02
Classification: E21B

Abstract:
1. A downhole isolation tool adapted for insertion in a wellbore, which when a component thereof is positioned in a first position allows fluids within said wellbore to be drawn through said tool, and when said component is positioned in a second position prevents said fluids from passing therethrough and up the wellbore, comprising: (A) an elongate sliding sleeve having an upper and lower end and an elongate cavity therewithin, further having : (B) an elongate seal sub, having a bore therethrough for slidably receiving therewithin said sliding sleeve and allowing slidable movement thereof from said first position to said second position, further having: wherein said component is said sliding sleeve, and when said sliding sleeve is in said first position it is positioned within said bore so that said second aperture means is aligned with said port means on said seal sub to allow communication of fluids surrounding said exterior surface of said seal sub with said elongate cavity in said sliding sleeve via said second aperture means; and when said sliding sleeve is in said second position, said seal member is aligned with said port means on said seal sub to thereby prevent communication of fluids surrounding said exterior surface of said seal sub with said elongate cavity via said second aperture means.