Measuring and testing – Borehole or drilling – Downhole test
Patent
1992-03-23
1994-03-29
Chilcot, Jr., Richard E.
Measuring and testing
Borehole or drilling
Downhole test
7386117, G01F 100
Patent
active
052974251
ABSTRACT:
An improved flowmeter system is described, together with circuitry, hardware, and techniques for its utilization for determining the rate of flow of fluids in conduits at a situs substantially remote from the information gathering and analysis situs. Arrangements are provided for utilization of the system in conduits, including deep water wells, having diameters as small as 2 inches, and wherein very low flowrates of liquid therein can be quite accurately measured to depths in the range of hundreds to thousands of feet. The device is configured sans moving parts, which overcomes prior art arrangements heretofore prone to wear and drift from calibration, and utilizes a new unique arrangement of transducer drive signals and sampling signals operatively associated with a plurality of timing networks whereby the precision and accuracy of the resulting system is not only enhanced by sampling well after the switching transients therein have decayed, but is even further substantially improved by compensating for the random drift, albeit relatively small, of the transducer output signals caused thereby through the deselection of the otherwise metered signal just prior to and post a polarity change in the AC-square wave excitation to said transducer, such that the resulting clamped switching transients are effectively prevented from causing noise feedback to the portion of the metering signal received and utilized as determinative of flowrate events at said remotely located situs.
REFERENCES:
patent: 4309909 (1982-01-01), Grebe et al.
patent: 4827765 (1989-05-01), Kessler
patent: 4969363 (1990-11-01), Mochizuki
Hamby Jimmie W.
Pearson Hubert S.
Waldrop William R.
Warren Donald E.
Young Steven C.
Biegel R.
Chilcot Jr. Richard E.
Petrusek Robert A.
Tennessee Valley Authority
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