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Institut Francais Du Pe'trole

Bernard Duperray

Benjamin Herzhaft

Lionel Rousseau

Jacques Sicre

Alain Donzier

Laurent Perier

The present invention relates to a method and to a system for monitoring the evolution of the characteristics of a fluid circulating in a well ( ) for example, wherein complex dynamic viscosity measurements are performed with a suitable detector ( ) arranged on a line ( ) through which said fluid circulates, so as to obtain a law of variation of the complex dynamic viscosity &eegr;* as a function of 2&pgr;f; a rheogram of the fluid, i.e. a law of variation of the viscosity &eegr; as a function of the shear ({dot over (&ggr;)}), is deduced therefrom; Va, Vp and YV are calculated from the rheogram; these stages are repeated after a predetermined time interval; the evolution of the characteristics of the fluid is deduced from these measurements.

Continuous measurement of the rheological characteristics of well fluids

The invention relates to a self-driving and self-locking hinge strap for mounting between two adjacent elements (A , A ), the strap being of the type constituted by at least one resilient strip ( ) preformed to have a section that is curved and designed to be secured via its two ends to the two elements, and to occupy a folded position and a deployed position. According to the invention, each resilient strip ( ) is provided with a layer of viscoelastic material ( ) interposed between one of the faces of the resilient strip ( ) and a stress plate ( ) in such a manner as to provide a hinge that also performs a damping function.

Self-driving, self-locking and damping hinge strap, and a hinge fitted with such straps

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Ars, France

Bernard Duperray