Title:
FLUID DENSITY MEASUREMENT
Document Type and Number:
WIPO Patent Application WO2003042666
Kind Code:
A3
Abstract:
A wellbore tool for measuring the density of a fluid flowing in a wellbore by a photon attenuation technique includes a tube defining a flow path for the fluid, a photon source at one end of the tube, and a photon detector arranged to receive photons which have passed along the tube. In a preffered implementation, a source which emits coincident photon pairs, preferably <22>Na, is used. In this embodiment, the tube defining the fluid flow path has first and second relatively straight and aligned measurement portions disposed on opposite sides of the photon source, so that each measurement portion receives a respective photon of some of the coincident pairs for transmission longitudinally along it. Respective detectors at the other ends of the measurement portions receive respective ones of the photon pairs. The detected coincident photons are counted, and the density of the fluid is derived from the count rate.
Inventors:
FITZGERALD JOHN BARRY (GB)
Application Number:
PCT/GB2002/004924
Publication Date:
February 05, 2004
Filing Date:
October 31, 2002
Export Citation:
Assignee:
SCHLUMBERGER TECHNOLOGY BV (NL)
PETROLEUM RES & DEV NV (NL)
SCHLUMBERGER CA LTD (CA)
SCHLUMBERGER HOLDINGS (VG)
SCHLUMBERGER OILFIELD ASSIST (VG)
SCHLUMBERGER OVERSEAS (PA)
SCHLUMBERGER SERVICES LTD (VG)
SCHLUMBERGER SURENCO SA (PA)
SCHLUMBERGER SERVICES PETROL (FR)
FITZGERALD JOHN BARRY (GB)
PETROLEUM RES & DEV NV (NL)
SCHLUMBERGER CA LTD (CA)
SCHLUMBERGER HOLDINGS (VG)
SCHLUMBERGER OILFIELD ASSIST (VG)
SCHLUMBERGER OVERSEAS (PA)
SCHLUMBERGER SERVICES LTD (VG)
SCHLUMBERGER SURENCO SA (PA)
SCHLUMBERGER SERVICES PETROL (FR)
FITZGERALD JOHN BARRY (GB)
International Classes:
G01N1/00; G01N23/06; G01N23/12; (IPC1-7): G01N9/24
Domestic Patent References:
| WO1997029356A1 | 1997-08-14 |
Foreign References:
| FR2605738A1 | 1988-04-29 |
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