The Baker Hughes Sand-Vac, Well-Vac, and Tele-Vac™ solutions use concentric coiled tubing (CCT) combined with a proprietary downhole switchable jet pump to remove solids and liquids from ultralow-pressure wellbores that are not treatable with standard circulating methods.
The systems operate by pumping liquid down the inner coiled tubing string and through the jet pump nozzle. This creates a localized pressure drop that essentially vacuums wellbore fluids and entrained solids from the reservoir. These cleanout systems isolate the fluids from your reservoir and allow continuous returns. And by avoiding the need to store nitrogen, these solutions provide significant benefits for cleanout operations that have issues related to supply, logistics, or platform deck space.
Used in extended-length producing intervals, these systems handle crossflow or thief-zone challenges that hamper conventional circulation cleanouts. The tools also incorporate optional built-in pressure and temperature memory gauges to collect accurate downhole data.
The Well-Vac mode increases the localized pressure drawdown to vacuum wellbore fluids, drilling mud, stimulation fluids, and other liquids from the reservoir.
In Sand-Vac and Well-Vac mode, the combined return flow enters the jet pump diffuser and recovers pressure from the nozzle to drive the return fluids to the surface via the CCT annulus.
A high-pressure jetting mode diverts all circulated flow through high-pressure nozzles to break and loosen consolidated sand bridges or place stimulation fluids. In this mode, no flow is routed to the jet-pump and no returns are taken to surface.