Method and apparatus for measuring multiphase flows
First Claim
1. A method of measuring flow rate for a multiphase fluid, such as the effluent of an oilwell, which may contain a mixture of liquid hydrocarbons, gas, and water, comprising the steps of:
- changing the flow velocity respectively in a first section and in a second section situated at a distance from each other in the flow direction to produce a first and a second pressure difference;
measuring said first and second pressure differences to obtain a first and a second pressure difference signals; and
determining a time lag corresponding to maximum correlation between said first and second pressure difference signals to derive a third signal indicative of the total volume flow rate q.
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Abstract
A device for measuring flow rate of multiphase fluids such as oilwell effluents, containing liquid hydrocarbons, gas, and water includes first and second sections situated at a distance one from the other in the flow direction, each including a passage provided with structure such as venturis for inducing a change of speed therein, and respective means for measuring the resulting pressure differences, the pressure difference signals obtained in the respective sections being suitable for cross-correlation to produce a signal representative of the total volume flow rate.
319 Citations
30 Claims
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1. A method of measuring flow rate for a multiphase fluid, such as the effluent of an oilwell, which may contain a mixture of liquid hydrocarbons, gas, and water, comprising the steps of:
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changing the flow velocity respectively in a first section and in a second section situated at a distance from each other in the flow direction to produce a first and a second pressure difference; measuring said first and second pressure differences to obtain a first and a second pressure difference signals; and determining a time lag corresponding to maximum correlation between said first and second pressure difference signals to derive a third signal indicative of the total volume flow rate q. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A device for measuring the flow rate of a multiphase fluid, comprising:
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first and second sections spaced from each other in the flow direction, each including a passage provided with means for inducing a change of velocity therein; and first and second means for measuring a pressure difference along respectively said first and second sections and generating first and second pressure difference signals suitable for cross-correlation with each other, said cross-correlation producing a third signal indicative of the total volume flow rate. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. A method of determining the production from a well, comprising:
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(a) measuring flow rate of multiphase fluids flowing from the well by changing the flow velocity of the flowing multiphase fluid respectively in a first section and in a second section spaced from each other in the flow direction of the fluids;
measuring pressure differences along respectively said first and said second section to obtain a first and a second pressure difference signals; and
comparing said first and second pressure difference signals to derive a third signal indicative of the total volume flow rate q of the flowing multiphase fluid; and(b) using the measured flow rate to determine the production from the well.
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Specification