Wellbore Acoustic Lab

Distributed acoustic sensing (DAS) data is currently being used to monitor flow events. DAS data can identify where fluid is being produced from a perforation or hydraulic fracture and it can be used to qualitatively determine where fluid is being injected into the formation during the hydraulic fracturing process. DAS data however has not been used to quantify these flow rates.

The acoustic lab is currently working to understand how acoustic data from wellbore sounds can be used to quantify fluid flow rates, fluid distribution during production and injection, and fluid saturation. The acoustic lab consists of a simulated hydraulically fractured well. Sound from production into this simulated well is recorded and processed with signal processing components and related to production rates.

The simulated fractured well consists of casing, perforation tunnel and a proppant filled fracture. The casing is 4 ft long, and has an outer diameter of 5 1/2-in and inner diameter of 4 7/8-in. The perforation tunnel has a diameter of 0.5-in. The proppant filled fracture has a width of 0.2-in., length of 2-ft and height of 1-ft. The proppant filled fracture is connected to the well through the perforation tunnel. Fluid is injected into one end of the fracture and is produced into the well through the perforation tunnel. The signal processing components consist of a B&K type 8103 hydrophone, a Nexus conditioning amplifier, NI-9234 data acquisition device, Labview, and Matlab software.