Measuring and testing – Volume or rate of flow – Using differential pressure
Reexamination Certificate
2006-08-08
2006-08-08
Thompson, Jewel V. (Department: 2855)
Measuring and testing
Volume or rate of flow
Using differential pressure
Reexamination Certificate
active
07086294
ABSTRACT:
A well has a downhole flow meter that is installed in a sub in a string of tubing. The flow meter has a body having an external profile that lands on a landing profile in the sub. The body has a passage with a throat area of reduced diameter. Upstream and downstream body ports in a side wall of the body are in fluid communication with the throat area and a downstream portion of the passage downstream of the throat area. Seals are located between the body and the sub, defining an upstream annular chamber and a downstream annular chamber surrounding the body, the chambers being in communication with the upstream and downstream body ports. Upstream and downstream sub ports in a side wall of the sub are in fluid communication with the upstream and downstream chambers. A sensor circuit is in operative engagement with the sub ports for determining a flow rate based on a pressure difference sensed between the throat area and the downstream portion of the passage in the body.
REFERENCES:
patent: 3176304 (1965-03-01), Peters et al.
patent: 3224267 (1965-12-01), Harlan et al.
patent: 4852401 (1989-08-01), Hrametz et al.
patent: 4941951 (1990-07-01), Sheppard et al.
patent: 5631413 (1997-05-01), Young et al.
patent: 6263730 (2001-07-01), Grande et al.
Baker Hughes Incorporated
Bracewell & Giuliani LLP
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