Patent ID: 8899316

Claim:
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 : (i) releasable latch means at said upper end thereof, constructed and arranged for releasibly coupling to a lower end of a pump apparatus; (ii) first aperture means, situated proximate said upper end, in fluid communication with said elongate cavity; (iii) second aperture means, situated approximately mid-length and longitudinally separated from said first aperture means, likewise in fluid communication with said elongate cavity; and (iv) a seal member, situated below said second aperture means; (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: (i) port means allowing fluid communication from an exterior surface of said seal sub to said bore; 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.