Patent ID: 9534471
Date: 2017-01-03
CPC Classifications: E21B

Claim:
1. A method of treating a plurality of well zones, comprising: locating a plurality of flow control devices along a well string in a well bore; providing each flow control device with a seat member having an annular recess of a unique axial length relative to the annular recesses of the other flow control devices, wherein the plurality of flow control devices are arranged in a sequence such that the axial lengths of the annular recesses progressively decrease along the well string in a given direction; dropping a dart with an engagement feature sized to engage the annular recess of a specific flow control device of the plurality of flow control devices; applying pressure through the well string after the engagement feature engages the annular recess of a desired flow control device to actuate the desired flow control device to an open flow position; stimulating a surrounding well zone after actuating the desired flow control device; and flowing via an internal valve and flow passage in the dart after stimulating the surrounding well zone, wherein the internal flow passage is formed upon dissolution of a dissolvable material of the dart.