Measuring and testing – Specific gravity or density of liquid or solid
Reexamination Certificate
2006-06-13
2006-06-13
Kwok, Helen (Department: 2856)
Measuring and testing
Specific gravity or density of liquid or solid
C073S061410, C073S061490, C073S061790
Reexamination Certificate
active
07059172
ABSTRACT:
The present invention discloses an apparatus for determining the density and the phase fraction of a fluid flowing in a conduit. The apparatus comprises a fiber optic density meter situated along the conduit that provides a signal indicative of the density of the fluid. The density meter includes two sound speed meters disposed at different sensing regions along the pipe. The sensing regions have a substantially different cross sectional area compliance. Each sound speed meter measures an acoustic pressure within the pipe at its corresponding axial location and provides a signal indicative of the effective fluid sound speed at its corresponding sensing region. Because each sensing region has a substantially different cross sectional area compliance, the density of the fluid is determined by the difference between the effective fluid sound speed signals. From the effective sound speed at either sensing region or from a separate acoustic sensor array, the infinite fluid sound speed may be determined. The phase fraction of the fluid can then be calculated by combining the infinite fluid sound speed, the fluid density, and known individual component densities and component sound speeds (oil, water, and/or gas).
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“Speed and Flow Measurement by an I
Kwok Helen
Patterson & Sheridan, LLP.
Weatherford / Lamb, Inc.
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