Patent ID: 7909108
Filing Date: 2011-03-22
Classification: E21B

Abstract:
1. A wellbore servicing system, comprising: a plurality of sleeve systems disposed in a wellbore, each sleeve system comprising a seat and a dart configured to selectively seal against the seat to the exclusion of other seats, the seats each comprising an upper seat landing surface and the darts each comprising a dart landing surface; wherein the darts each comprise a dart landing surface that is configured to complement an upper seat landing surface of the seat to which the dart is configured to selectively seal against; wherein a first seat of the plurality of seats is disposed within the wellbore downhole relative to a second seat of the plurality of seats; and wherein a first upper seat landing surface of the first seat comprises a first upper seat landing surface angle that is smaller than a second upper seat landing surface angle of a second upper seat landing surface of the second seat.