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Downhole Chemical Injection Acoustic Flow Meter

IP.com Disclosure Number: IPCOM000247126D
Publication Date: 2016-Aug-08
Document File: 1 page(s) / 14K

Publishing Venue

The IP.com Prior Art Database

Abstract

The invention proposed is a downhole chemical injection mandrel with an integrated acoustics-based flow measurement device. An electrically conductive line is used to control a downhole ultrasonic transmitter-receiver system from the surface, using the returned signal from the system to determine downhole chemical injection rate at a particular valve. The benefit over a surface flow measurement is the ability to use this invention with multiple instances of injecting valves that can determine local injection rates throughout the wellbore. Flow rate measurements with a ¿time of flight¿ ultrasonic flowmeter The primary implementation of the invention is theintegration of a time of flight ultrasonic measurement device(s) connected to the flow path in the chemical injection mandrel. A downhole pair of transmitter/receivers are used as the flow measurement device, with electric input and output through a conductor running to surface. Using a known sonic velocity for the injected fluid, in addition to a known separation distance between the pair of transmitter/receivers, the fluid velocity can be determined. The travel time for the signal between the pair of transmitter/receivers will depend on whether the signal is traveling in the direction of flow, or against the flow. The difference in transit times allows for calculation of the fluid velocity. Implementation of this device into a chemical injection mandrel requires the following components: 1) Chemical injection mandrel 2) Chemical injection valve 3) Fluid flow path with a fluid of known sonic velocity 4) Pair of ultrasonic transmitter/receivers 5) Pair of conductors running from transmit/receive devices to surface 6) Surface unit and processor to send, receive, and process electrical signals

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Downhole Chemical Injection Acoustic Flow Meter

The invention proposed is a downhole chemical injection mandrel with an integrated acoustics-based flow measurement device. An

electrically conductive line is used to control a downhole ultrasonic transmitter-receiver system from the surface, using the returned signal

from the system to determine downhole chemical injection rate at a particular valve. The benefit over a surface flow measurement is the

ability to use this invention with multiple instances of injecting valves that can determine local injection rates throughout the wellbore.

Flow rate measurements with a ¿time of flight¿ ultrasonic flowmeter The primary implementation of the invention is theintegration of a time of flight ultrasonic measurement device(s) connected to the flow path in the chemical injection mandrel. A downhole

pair of transmitter/receivers are used as the flow measurement device, with electric input and output through a conductor running to

surface. Using a known sonic velocity for the injected fluid, in addition to a known separation distance between the pair of

transmitter/receivers, the fluid velocity can be determined. The travel time for the signal between the pair of transmitter/receivers will

depend on whether the signal is traveling in the direction of flow, or against the flow. The difference in transit times allows for calculation of

the fluid velocity. Implementation of this device into a chemical injection mandrel requires the followi...