Multizone treatment system

摘要

A technique provides a system and methodology for treating a plurality of zones, e.g. well zones. A plurality of flow control devices is located along a tubular structure, such as a well string in a wellbore. Each flow control device comprises a seat member with an annularly located recess having a unique profile relative to the annularly located recesses of the other flow control devices. Darts are designed with engagement features sized to correspond with selected annularly located recesses. Each dart may have an engagement feature of a specific length designed to engage the corresponding recess of a specific flow control device to enable actuation of that flow control device once the dart is dropped through the tubular structure.

主权项

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.