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A technique provides for stimulating or otherwise treating multiple intervals/zones of a well by controlling flow of treatment fluid via a plurality of flow control devices. The flow control devices are provided with internal profiles and flow through passages. Hydraulic darts are designed for selec

A technique provides for stimulating or otherwise treating multiple intervals/zones of a well by controlling flow of treatment fluid via a plurality of flow control devices. The flow control devices are provided with internal profiles and flow through passages. Hydraulic darts are designed for selective engagement with the internal profiles of specific flow control devices, and each hydraulic dart may be moved downhole for engagement with and activation of a specific flow control device.

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1. A method of treating a plurality of well zones, comprising: providing each flow control device of a plurality of flow control devices with an internal profile and a flow through passage;locating the plurality of flow control devices along a casing in a wellbore; andselecting a plurality of darts

1. A method of treating a plurality of well zones, comprising: providing each flow control device of a plurality of flow control devices with an internal profile and a flow through passage;locating the plurality of flow control devices along a casing in a wellbore; andselecting a plurality of darts constructed for engagement with the internal profile of specific flow control devices of the plurality of flow control devices;releasing each dart of the plurality of darts for engagement with the internal profile of the specific flow control device;selectively actuating each dart downhole to engage the internal profile of the specific flow control device by controlling the fluid acting on the dart over a predetermined time period: wherein selectively actuating comprises: shifting a mandrel within a housing; andcontrolling the rate of shifting of the mandrel using an orifice to restrict flow of an internal fluid; andcreating a fluid barrier via engagement with the internal profile for enabling a stimulation operation. 2. The method as recited in claim 1, wherein providing comprises providing a plurality of sliding sleeves. 3. The method as recited in claim 1, wherein providing comprises providing each flow through passage of each flow control device with the same diameter. 4. The method as recited in claim 1, wherein selecting comprises constructing each dart of the plurality of darts with a check valve oriented to allow fluid flow back through the flow through passage. 5. The method as recited in claim 1, wherein selectively actuating comprises controlling each dart from the surface via changes in pressure of the fluid acting against the dart. 6. The method as recited in claim 1, wherein selectively actuating comprises controlling each dart from the surface via changes in flow of the fluid acting against the dart. 7. The method as recited in claim 1, wherein selectively actuating further comprises shifting the mandrel within to lock an engagement feature in a position for engagement with the internal profile of a desired flow control device. 8. The method as recited in claim 7, further comprising providing an abrupt increase in pressure prior to the mandrel locking the engagement feature to enable movement of the dart past the flow control device. 9. The method as recited in claim 7, further comprising providing an abrupt increase in flow rate prior to the mandrel locking the engagement feature to enable movement of the dart past the flow control device. 10. The method as recited in claim 1, further comprising resisting shifting of the mandrel with a spring member. 11. The method as recited in claim 10, further comprising placing a check valve in parallel with the orifice to facilitate return of the mandrel to an original rest position. 12. The method as recited in claim 1, further comprising exposing the internal fluid to a compensator piston. 13. A system for use in treating a well, comprising: a dart having an engagement member shaped to engage an internal profile of a flow control device located in a well completion having a plurality of flow control devices, the dart further comprising a mandrel slidably mounted in a dart housing such that shifting of the mandrel is used to secure the engagement member for sealing engagement with the internal profile of a desired flow control device to create a fluid barrier at the flow control device, a rate of shifting the mandrel being controlled by restricting flow of an internal dart fluid. 14. The system as recited in claim 13, wherein the rate of shifting the mandrel is controlled by an orifice. 15. The system as recited in claim 13, wherein the dart further comprises a compensator piston exposed to the internal dart fluid. 16. The system as recited in claim 13, wherein the dart further comprises a flow through passage extending through the mandrel and a check valve for selectively blocking flow through the flow through passage. 17. A method, comprising: deploying a multizone well stimulation system into a wellbore with a plurality of flow control devices;providing each dart of a plurality of darts with a hydraulic actuation system which is hydraulically manipulated via changes in flow rate or pressure acting on the dart through the multizone well stimulation system, wherein each dart includes a mandrel which is selectively moved hydraulically and the movement of the dart is controlled by restricting flow of an internal dart fluid via an orifice;releasing individual darts into the multizone well stimulation system for engagement with the predetermined flow control device; andusing the changes in flow rate or pressure to actuate the dart into engagement with a predetermined flow control device of the plurality of flow control devices, thus enabling actuation of the predetermined flow control device to a different operational position. 18. The method as recited in claim 17, wherein the mandrel is selectively moved to lock an engagement feature into an engagement position.