Method and apparatus for measuring oil effluent flow rates
First Claim
1. A flow rate measurement method adapted to oil effluents made up of multiphase fluid mixtures comprising water, oil, and gas, comprising the following steps:
- the effluent is passed through a Venturi in which the effluent is subjected to a pressure drop (Δ
p);
a mean value (<
Δ
p>
) of the pressure drop is determined over a period t1 corresponding to a frequency f1 that is low relative to the frequency at which gas and liquid alternate in a slug flow regime;
a mean value (<
ρ
m>
) is determined for the density of the fluid mixture at the constriction of the Venturi over said period t1; and
a total mass flow rate value <
Q>
is deduced for the period t1 under consideration from the mean values of pressure drop and of density.
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Abstract
The invention relates to a flow rate measurement method adapted to oil effluents made up of multiphase fluid mixtures comprising water, oil, and gas. The effluent is passed through a Venturi in which the effluent is subjected to a pressure drop (Δp), a mean value (<Δp>) of the pressure drop is determined over a period t1 corresponding to a frequency f1 that is low relative to the frequency at which gas and liquid alternate in a slug flow regime, a mean value (<ρm>) is determined for the density of the fluid mixture at the constriction of the Venturi over said period t1, and a total mass flow rate value <Q> is deduced for the period t1 under consideration from the mean values of pressure drop and of density.
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Citations
54 Claims
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1. A flow rate measurement method adapted to oil effluents made up of multiphase fluid mixtures comprising water, oil, and gas, comprising the following steps:
- the effluent is passed through a Venturi in which the effluent is subjected to a pressure drop (Δ
p);
a mean value (<
Δ
p>
) of the pressure drop is determined over a period t1 corresponding to a frequency f1 that is low relative to the frequency at which gas and liquid alternate in a slug flow regime;
a mean value (<
ρ
m>
) is determined for the density of the fluid mixture at the constriction of the Venturi over said period t1; and
a total mass flow rate value <
Q>
is deduced for the period t1 under consideration from the mean values of pressure drop and of density. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
- the effluent is passed through a Venturi in which the effluent is subjected to a pressure drop (Δ
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13. A flow rate measurement method comprising the following steps:
- determining a mean value (<
Δ
p>
) of the pressure drop of a fluid mixture over a period t1 corresponding to a frequency f1 that is low relative to the frequency at which gas and liquid alternate in a slug flow regime;determining a mean value (<
ρ
m>
) of the density of the fluid mixture over said period t1; and
determining a total mass flow rate value <
Q>
for the period t1 under consideration from the mean values of pressure drop and of density.- View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
- determining a mean value (<
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33. An apparatus for flow rate measurement comprising:
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a Venturi to receive a fluid mixture;
a pressure sensor, coupled to said Venturi, to determine a mean value (<
Δ
p>
) of a pressure drop of said fluid mixture over a period t1 corresponding to a frequency f1 that is low relative to the frequency at which gas and liquid alternate in a slug flow regime; and
a data processing unit, coupled to said pressure sensor and to said Venturi, to determine a mean value (<
ρ
m>
) of the density of the fluid mixture over said period t1 and to determine a total mass flow rate value <
Q>
for the period t1 under consideration from the mean values of pressure drop and of density.- View Dependent Claims (34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54)
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Specification