Flow prediction model that is a function of perforation cluster geometry, fluid characteristics, and acoustic activity

1. A method, comprising:

obtaining one or more measurements of acoustic energy as a function of time and position downhole;

deriving acoustic activity values as a function of time and position from the one or more measurements;

predicting fluid flow rate for a downhole perforation cluster with a flow prediction model, wherein the flow prediction model comprises a first function or constant multiplied by at least one of the acoustic activity values and a second function or constant divided by the at least one of the acoustic activity values, wherein at least one of the first and second functions is based on at least one of perforation cluster geometry, fluid characteristics, and at least one of the acoustic activity values; and

storing or displaying the predicted fluid flow rate.

2. The method of claim 1 , wherein the flow prediction model includes a bias value.

3. The method of claim 1 , wherein the fluid characteristics comprise an effective fluid viscosity.

4. The method of claim 1 , wherein the fluid characteristics comprise an estimated fluid density.

5. The method of claim 1 , wherein the perforation cluster geometry comprises a perforation diameter.

6. The method of claim 1 , wherein the perforation cluster geometry comprises a number of perforations.

7. The method of claim 1 , wherein obtaining the one or more measurements comprises:

providing source light to an optical fiber deployed in a downhole environment;

receiving backscattered light from the optical fiber and producing one or more optical interferometry signals from the backscattered light; and

converting each of the one or more optical interferometry signals to an electrical signal and digitizing each electrical signal to obtain one or more digitized electrical signals.

8. The method of claim 1 , further comprising displaying a plan based on the predicted fluid flow rate, the plan related to at least one of well treatment operations and proppant injection operations.

9. The method of claim 1 , further comprising initiating or adjusting a downhole operation based on the predicted fluid flow rate, the downhole operation related to at least one of well treatment operations or proppant injection operations.

10. A system, comprising:

an acoustic sensing arrangement that obtains one or more measurements of acoustic energy as a function of time and position downhole; and

at least one processing unit that predicts fluid flow rate for a downhole perforation cluster with a flow prediction model based on acoustic activity values derived from the one or more measurements, wherein the flow prediction model comprises a first function or constant multiplied by at least one of the acoustic activity values and a second function or constant divided by the at least one of the acoustic activity values, wherein at least one of the first and second functions is based on at least one of perforation cluster geometry, fluid characteristics, and at least one of the acoustic activity values.

11. The system of claim 10 , wherein the flow prediction model includes a bias value.

12. The system of claim 10 , wherein the fluid characteristics comprise an effective fluid viscosity.

13. The system of claim 10 , wherein the fluid characteristics comprise an estimated fluid density.

14. The system of claim 10 , wherein the perforation cluster geometry comprises a perforation diameter.

15. The system of claim 10 , wherein the perforation cluster geometry comprises a number of perforations.

16. The system of claim 10 , further comprising a monitor in communication with the at least one processing unit, wherein the at least one processing unit causes the monitor to display a plan based on the predicted fluid flow rate, the plan related to at least one of well treatment operations and proppant injection operations.

17. The system of claim 10 , wherein the at least one processing unit provides a control signal to initiate or adjust a downhole operation based on the predicted fluid flow rate, the downhole operation related to at least one of well treatment operations and proppant injection operations.

18. The system of claim 10 , wherein the acoustic sensing arrangement comprises:

an optical fiber;

a light source to provide source light to the optical fiber;

a receiver coupled to the optical fiber, wherein the receiver comprises:

at least one optical fiber coupler that receives backscattered light and that produces one or more optical interferometry signals from the backscattered light; and

photo-detectors that produce an electrical signal for each of the one or more optical interferometry signals; and

at least one digitizer that digitizes each electrical signal to obtain one or more digitized electrical signals.