Indexing sleeve for single-trip, multi-stage fracing

摘要: A sliding sleeve has a sensor that detects plugs (darts, balls, etc.) passing through the sleeves. first insert on can be hydraulically activated by fluid pressure in surrounding annulus once preset number of have passed sleeve. Movement this activates catch second insert. Once next plug is deployed, engages it so applied against seated tubing string moves moved, reveals port housing communicating sleeve's bore with an adjacent wellbore interval stimulated. The may also after time Several sleeves used together various arrangements to treat multiple intervals wellbore.