The Weatherford AutoFrac system enables remote-controlled actuation of lower-completion tools for efficient stimulation of openhole sections in extended-reach wells. The system provides options for tool communication that do not rely on control lines or mechanical actuation: radio frequency identification (RFID) technology, frequency-modulated pressure pulses, ACTiFRAC pressure pulses, timers, or a combination of these methods. RFID actuation is the primary form of actuation for most applications. When it is not possible to drop RFID tags downhole, the system can be actuated using a sequence of pressure cycles developed specially for use with this system. ACTiFRAC technology leverages algorithms included in the tool software to recognize pressure pulses during circulation. Remotely operated flapper valves and sleeves provide selective zonal isolation and proppant diversion. By enabling users to preset an actuation plan based on the completion design, the system significantly reduces the time between fracture cycles. Operational logic can be fully customized to specific well conditions and operator requirements. Additionally, the AutoFrac system is the only openhole-completion system that has proven capable of functioning during a full screenout. The technology has been successfully deployed in challenging North Sea environments.
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