Apparatus and method of sensing fluid flow using sensing...

Details Apparatus and method of sensing fluid flow using sensing... Apparatus and method of sensing fluid flow using sensing...

2006-03-07

2006-03-07

Turner, Samuel A. (Department: 2877)

Optics: measuring and testing

By light interference

Using fiber or waveguide interferometer

Reexamination Certificate

active

07009707

ABSTRACT:
An apparatus and method of sensing fluid flow are provided to measure fluid flow rates in production tubing, pipelines, open wells and tunnels. The proposed invention takes advantage of a sensor with processing means to interpret the fluid flow rate, the sensor being responsive to the mechanical perturbations of the sensor itself arising from the impingement of turbulent fluid flow on the sensor. In operation, the sensor is mounted in the fluid flow such that the fluid flows through an aperture in the sensor and/or around the outside surface of the sensor. The sensor of the invention bears definite advantage over known sensors and it is particularly suited to downhole oil and gas applications. Preferably, the invention employs fiber optic sensing techniques which are amenable to multiplexing a plurality of the sensors with long down leads. Such an arrangement is robust to withstand the high temperature and pressure environment. Advantageously, the invention allows non-intrusive measurement of fluid flow in production pipes and measurement of differential fluid flows along perforated casing or open well sections in the pay zone.

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