Distributed two dimensional fluid sensor
First Claim
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1. A fluid measurement system for measuring moving fluid along a length of a conduit comprising:
- an elongate structure physically divided into a plurality of sampling sections along it'"'"'s length and located in the conduit;
a heated core element and a distributed temperature sensor along the length of the structure, said heated core element and said distributed temperature sensor arranged so that the temperature sensor is physically between the heated core and an outside surface of the structure to sense heat loss from the core to its environment, and said heated core element and said distributed temperature sensor are encased in a material which thermally isolates the heated core element from the moving fluid;
one or more wires arranged along the length of the structure, said wires being configured to be usable as a transmission line;
at least one high frequency pulse generator for injecting a high frequency pulse along at least one sampling section of the structure; and
a data acquisition unit for recording the heat loss along the distributed temperature sensor and the velocity of the high frequency pulse along each sampling section of the structure to provide a two-dimensional measure of fluid type and velocity simultaneously for the length of the conduit.
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Abstract
A fluid measurement system and method for determining distributed measurement of a fluid type and a fluid velocity in a wellbore, pipeline or other conduit in which fluid is moving. Measurement is made by immersing one or more cables having sequential sampling sections in the fluid and monitoring a cooling effect across a cable on the sampling sections and the response to injection of a high frequency pulse each sampling section. A probabilistic model is then used to determine the distributed velocity and fluid types along the conduit.
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Citations
20 Claims
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1. A fluid measurement system for measuring moving fluid along a length of a conduit comprising:
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an elongate structure physically divided into a plurality of sampling sections along it'"'"'s length and located in the conduit; a heated core element and a distributed temperature sensor along the length of the structure, said heated core element and said distributed temperature sensor arranged so that the temperature sensor is physically between the heated core and an outside surface of the structure to sense heat loss from the core to its environment, and said heated core element and said distributed temperature sensor are encased in a material which thermally isolates the heated core element from the moving fluid; one or more wires arranged along the length of the structure, said wires being configured to be usable as a transmission line; at least one high frequency pulse generator for injecting a high frequency pulse along at least one sampling section of the structure; and
a data acquisition unit for recording the heat loss along the distributed temperature sensor and the velocity of the high frequency pulse along each sampling section of the structure to provide a two-dimensional measure of fluid type and velocity simultaneously for the length of the conduit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method of determining fluid composition and flow rate in a conduit;
- the method comprising the steps;
(a) locating a cable in the fluid through a length of the conduit, the cable comprising a plurality of physically separate sampling sections; (b) measuring an ambient temperature at a plurality of measurement points along the length of the conduit; (c) heating a core of the cable for a predetermined heating period, and taking temperature measurements at the same measurement points; (d) injecting a high frequency signal along the cable; (e) recording a response of an average velocity of propagation of the signal over each sampling section of the cable; and (f) determining distributed fluid type and a fluid velocity through the length of the conduit. - View Dependent Claims (19, 20)
- the method comprising the steps;
Specification