Patent ID: 11859488
Assignee: BP EXPLORATION OPERATING COMPANY LIMITED
Field: Measurement (Instruments)
Classification: CPC E  G | IPC E  G

Claim 14:
15. A method of characterizing fluid inflow into a wellbore, the method comprising:
obtaining an acoustic signal from a sensor within the well bore, wherein the acoustic signal comprises a plurality of acoustic samples across a plurality of depth intervals along the wellbore;
determining a plurality of frequency domain features from the acoustic signal, wherein the plurality of frequency domain features are obtained for each acoustic sample of the plurality of acoustic samples across the plurality of depth intervals, and wherein the plurality of frequency domain features comprise at least two different frequency domain features, and wherein the plurality of frequency domain features are determined from a frequency domain representation of the acoustic signal in a time domain;
identifying one or more fluid inflow locations within the plurality of depth intervals using one or more frequency domain features of the plurality of frequency domain features;
inputting, at the identified one or more fluid inflow locations, the one or more frequency domain features of the plurality of frequency domain features into each fluid flow model of a plurality of fluid flow models, wherein each fluid flow model is a machine learning model, and wherein the plurality of fluid flow models comprises a gas phase flow model, an aqueous phase flow model, and a hydrocarbon liquid phase flow model;
determining, for each of the identified one or more fluid inflow locations, an output from each fluid flow model; and
identifying, based on the output from each fluid flow model, at least one of a gas phase inflow, an aqueous phase inflow, or a hydrocarbon liquid phase inflow at the identified one or more fluid inflow locations using each fluid flow model of the plurality of fluid flow models, and wherein at least two of the plurality of fluid flow models use different parameters;
identifying a fluid flow regime based on the identifying of the at least one of the gas phase inflow, the aqueous phase inflow, the hydrocarbon liquid phase inflow, the gas phase flow, the aqueous phase flow, or the hydrocarbon liquid flow using the plurality of the frequency domain features at the identified one or more fluid inflow locations.