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 fracking an interval in a subterranean location, comprising:
running in a tubular string with a plurality of axially spaced wall ports and a valve assemblies associated with said plurality of wall ports; using said selected valve assemblies at said plurality of wall ports to sequentially open said wall ports while sequentially closing off, with a closure device, a passage in said tubular string adjacent to said selectively opened wall port; configuring said closure device to fail and be removed from said passage.