2454256-A is referenced by 8 patents and cites 4 patents.

A method for measuring density of a fluid that includes (i) flowing the fluid through a substantially horizontal conduit 1; (ii) measuring a pressure difference W P1 between two vertically-spaced measurement positions in the conduit 1; and (iii) using the pressure difference W P1 to determine the density of the fluid.; More particularly, the method may provide for measuring a flow rate of a gas-liquid fluid mixture by (i) flowing the fluid through a substantially horizontal conduit 1 having a constriction region 3; (ii) measuring a first pressure difference W P1 between two vertically-spaced measurement positions in the conduit1 ; (iii) measuring a second pressure difference W P2 between two horizontally-spaced measurement positions in the conduit 1, the first horizontally-spaced measurement position being at the constriction region 3 and the second horizontally-spaced measurement position being upstream or downstream of the constriction region 3; and (iv) using the first and the second pressure differences to determine a flow rate of the gas-liquid fluid mixture.; The method might further comprise measuring a third pressure difference W P3 between two further vertically-spaced measurement positions in the conduit 3 spaced upstream or downstream of the vertically-space measurement positions where the first pressure difference W P1 is measured, enabling slip between the gas and liquid phases to be accounted for. A further embodiment of the method concerns conditioning the fluid mixture to exhibit swirling flow 5 which separates the liquid from the gas at the measurement positions. A section of a conduit is provided with upper and lower passages, directly above one another and extending horizontally.

Title
Determination of density and flow rate using differential pressure measurements
Application Number
GB20070021636 20071103
Publication Number
2454256 (A)
Application Date
November 3, 2007
Publication Date
May 6, 2009
Inventor
Sherwood John
GB
Atkinson Ian
GB
Assignee
Schlumberger Holdings
VG
IPC
G01F1/76
G01F 01/76
G01F1/74
G01F 01/74
G01F1/34
G01F 01/34
G01N9/00
G01N 09/00
G01F1/88
G01F 01/88
G01F1/74
G01F 01/74
G01F1/40
G01F 01/40
G01F1/34
G01F 01/34
G01N9/26
G01N 09/26
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