Institut Francais Du Pe'trole

Other

Vinci Technologies

Institut National De La Sante Et De La Recherche Medicale

Ifp Energies Nouvelles

Technomed Medical Systems

Georges Constantinou

Jean Laurent

Axelle Baroni

Christian Wittrisch

Claude Beauducel

Francois Lacoste

Patrick Meynier

Emmanuel Blanc

Chistian Wittrisch

Marc Bernard

Jean-Yves Chapelon

Jacques Dory

Gerard Gilles

A logging probe supporting device includes a connector that can be plugged in at the bottom of the well with a logging cable contained in the inner space of rods to which the supporting device is fastened and fluid communicating openings provided between the inner space of the rods and the outside of the supporting device, the openings being arranged between the probe and connector. The device includes, between the openings and the connector, a shutoff such as check valves allowing fluid circulation from the inside towards the outside and preventing circulation from the outside towards the inside of the supporting device.

Measurement device in a horizontal well

A hydrophone which is automatically inhibited when the immersion depth exceeds a predetermined threshold by action, on the push element ( ) of a switch ( ), of a flexible wall that bends under the action of the outside pressure. The hydrophone comprises a tubular body ( ) with two chambers ( ) separated by a partition ( ). One of the chambers is closed by a flexible diaphragm ( ). Switch ( ) is fixed at the center of one of the chambers. Diaphragm ( ) can push down on and actuate push element ( ) by bending. The body can advantageously consist of two parts that can be screwed onto one another, which allows easier adjustment of the inhibition pressure. A pressure-sensitive reception unit (S) is arranged in the other chamber.

Hydrophone with automatic inhibition in case an adjustable immersion threshold is exceeded

Very low distortion hydrophone comprising at least one pair of sensitive elements ( and ) of piezoelectric type (for example and not limitatively), associated with at least one of the opposite flexible faces of a housing ( ) formed by assembling cups ( and ) with rigid edges. The opposite faces of one of the discs, ( ), are provided with electrodes over the total surface thereof. On the other hand, at least one of electrodes ( and ) associated with the opposite faces of second disc ( ) only covers one or more portions (an annular strip for example) of each of these faces in an external zone of each cup ( ) more subjected to nonlinear stresses. Electrodes ( and ) of the two sensitive discs ( and ) are interconnected so as to make the difference between the electric signals generated by the two discs in response to the pressures applied, with the effect, experimentally verified, that the distortion resulting from this layout, notably due to a second harmonic ( ), is practically suppressed. The hydrophone can be used for geophysics, detection or locating, etc.

Low distortion ratio hydrophone

Hydrophone with two unsymmetrically connected sensitive elements. The hydrophone comprises a detection unit including a closed housing (,) delimited by two cups (,) resting against each other, each one being provided with a flexible diaphragm (,) and at least two piezoelectric sensitive elements (,) associated each with electrodes (,), one outside the housing, the other inside the housing. The two sensitive elements are preferably different in size, notably with different diameters. Electrodes (,) of the sensitive elements that are not in contact with cups (,) are electrically interconnected and the electrodes in contact with cups (,) are also electrically interconnected. Each detection unit is preferably included in a protective assembly (not shown). The hydrophone can be used for marine seismic monitoring or prospecting for example.

Hydrophone for acoustic or seismic wave reception

The hydrophone according to the invention comprises at least one detection unit (1) comprising a casing made up of two cups (2a, 2b) resting on each other by a peripheral rim (3), each one of them being provided with a flexible central part, and a sensitive element (4) associated with electrodes, that is fastened to the central part of the cups, on the outer face thereof, a hollowed flat centering element (6) made of a deformable material, into which at least one casing is fitted, intended to be inserted into a tube (9) along an axial plane thereof, this centering element being provided for example with an inner slot (8) for fitting in the peripheral rim of the two cups (2a, 2b) of the casing, and a sealed protective coating (11) sheathing detection unit (1), and a part of the inner face of tube (9). Once the centering element is introduced in the tube, the substance forming the coating is injected into a thin space provided around the centering element by a two-legged moulding piece (13a, 13b) that is inserted into the tube. The hydrophone can be used in geophysical prospecting or subsea listening for example.

Hydrophone and process for manufacturing it

Growing community of inventors

La Varenne Saint Hilaire, France

Georges Constantinou