DAS data processing to identify fluid inflow locations and fluid type

A system of developing a fluid flow model for a wellbore, the system comprising:

• a processor;
• and
• a memory comprising a flow application, wherein the flow application, when executed on the processor, configures the processor to:
• receive an acoustic signal from a sensor within a conduit for each flow test of a plurality of flow tests at a plurality of length intervals, wherein each flow test comprises introducing one or more fluids of a plurality of fluids into a flowing fluid within a conduit at predetermined locations, wherein the plurality of fluids comprise a hydrocarbon gas, a hydrocarbon liquid, an aqueous fluid, or a combination thereof, wherein the acoustic signal comprises acoustic samples across a portion of the conduit including the predetermined locations, and wherein a plurality of frequency domain features are determined for each length interval of the plurality of length intervals from a frequency domain representation of the acoustic signal in the time domain;
• determine the plurality of frequency domain features from the acoustic signal for each of the plurality of fluid flow tests, wherein the plurality of frequency domain features are obtained across the portion of the conduit including the predetermined locations;
• and
• train a plurality of fluid flow models using, as inputs, the plurality of frequency domain features for the plurality of the tests at each length interval of the plurality of length intervals and an identification of the one or more fluids introduced into the conduit, where a first fluid flow model of the plurality of fluid flow models is different than a second fluid flow model of the plurality of fluid flow models.