Schlumberger Technology Corporation

Schlumberger Technical Corporation

Jean-Pierre Hulin

Claude Fierfort

Roger Coudol

The invention is related to a device for measuring the flowrate of fluid through a well. The device according to the invention comprises an upper portion adapted for connection with a cable, two elongated side members, generally parallel to and spaced from each other, secured to the upper portion, a vortex generating assembly comprising at least one obstacle secured between said side members transversely of their longitudinal direcition, said side members having, at least in the region of said assembly, facing walls which are substantially planar, and a transducer responsive to the occurrence of vortices generated by said assembly, said transducer producing a signal indicative of said flowrate.

Device for measuring the flow of fluid in a well

The method according to the present invention for determining the flowrate of a fluid flowing in a well comprises the steps of lowering in the well a logging sonde comprising at least one vortex street generating obstacle and a transducer responsive to pressure variations due to the generation of vortices, the transducer producing, for each depth in the well, a detection signal the useful component of which has a frequency f and an amplitude A, deriving from the detection signal a first signal indicative of frequency f, deriving from the detection signal a second signal indicative of the reduced amplitude Ar, defined as the ratio A/f.sup.2, and forming from the first and second signals an indication of the flowrate in accordance with a first predetermined relationship expressing the frequency f as a function of the flowrate and of the bubble rate of the fluid at the respective depth, the first relationship including a linear dependency of the frequency f upon the flowrate, and a second predetermined relationship expressing the reduced amplitude Ar as a function of the bubble rate and of the flowrate.

Method and apparatus for determining the flow characteristics of a fluid

A method and apparatus for determining the flow rate and other flow characteristics of a polyphase fluid or a turbulent single-phase fluid flowing in a conduit are disclosed. Two differential pressure sensors are provided, each having two pressure ports sensitive to local pressure variation in the fluid. The pressure ports are maintained in a predetermined spatial relationship and in a predetermined orientation relative to the general direction of the flow. The detection signals from the respective sensors are correlated to obtain the flow rate. Additionally, a selected one of the detection signals is processed to obtain other flow characteristics. One of these other flow characteristics, the type of flow, is useful in facilitating the determination of the flow rate.

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Saint-Maur, France

Jean-Pierre Hulin