Completion method for stimulation of multiple intervals
First Claim
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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; and
selecting 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; and
controlling the rate of shifting of the mandrel using an orifice to restrict flow of an internal fluid; and
creating a fluid barrier via engagement with the internal profile for enabling a stimulation operation.
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Abstract
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.
332 Citations
18 Claims
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1. A method of treating a plurality of well zones, comprising:
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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; and selecting 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; and controlling the rate of shifting of the mandrel using an orifice to restrict flow of an internal fluid; and creating a fluid barrier via engagement with the internal profile for enabling a stimulation operation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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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. - View Dependent Claims (14, 15, 16)
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17. A method, comprising:
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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; and using 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. - View Dependent Claims (18)
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Specification