Multi-stage fracturing with smart frack sleeves while leaving a full flow bore

摘要

Fracking ports are initially obstructed with respective biased sleeves that have an associated release device responsive to a unique signal. The signal can be electronic or magnetic and delivered in a ball or dart that is dropped or pumped past a sensor associated with each release device. Each sensor is responsive to a unique signal. When the signal is received the release device allows the bias to shift the sleeve to open the fracture port and to let a flapper get biased onto an associated seat. The flapper and seat are preferably made from a material that eventually disappears leaving an unobstructed flow path in the passage. The method calls for repeating the process in an uphole direction until the entire zone is fractured. The flapper and seat can dissolve or otherwise disappear with well fluids, thermal effects, or added fluids to the well.

主权项

1. A method for treating an interval in a subterranean location, comprising:
sequentially opening a plurality of axially spaced wall ports in a tubular string having valve assemblies associated with said plurality of wall ports while sequentially closing off, with a closure device, a passage in said tubular string adjacent to said sequentially opened wall ports, using said valve assemblies at said plurality of wall ports; shifting said valve assemblies in a downhole direction with released potential energy, said shifting activating said closure device; sequentially treating the interval through said ports; configuring said closure devices to fail and be removed from said passage without intervention in said passage.