Downhole flow measurements with optical distributed vibration/acoustic sensing systems

Abstract

A method of verifying a substance interface location during a cementing operation can include optically measuring vibrations caused by substances flowing across structures distributed along a wellbore, the vibrations being caused at each structure, and the vibrations changing at each structure as the interface displaces across the structure. A method of determining a property of at least one substance flowed in a wellbore can include optically measuring vibrations caused by the substance flowing across structures distributed along a wellbore, the vibrations being caused at each structure, and the structures having different shapes, thereby causing the vibrations at the structures to be different from each other when the substance flows across the differently shaped structures.

Dependencies are inferred from the claim text.