Abstract: The invention relates to an internal flame gas burner comprising a gas injector (1), a vacuum tube (2), and an annular chamber (5) formed by a pot (3) covered by a cap (4), the chamber having an internal edge (51) perforated with flame exit ports (510), and the tube (2) having a convergent section open to the ambient air at an inlet end, and a divergent section succeeding the convergent section, ending at the outlet of the tube and opening out into the chamber, the injector being relatively closer to the inlet of the tube than to the outlet. According to the invention, the tube extends longitudinally along an axis (X) contained in a mid-plane (P) of the annular chamber, this tube having a length (L2) at most equal to twice the greatest distance (R) separating the internal edge (51) of the chamber from the center (50) of this chamber.

Abstract: A modelling method having application to petroleum production, soil cleaning, etc. for optimizing faster and more realistically the displacement conditions, in a porous medium wettable by a first fluid (water for example), of a mixture of fluids including this wetting fluid, another, non-wetting fluid (oil for example) and a gas.

Abstract: A safety device for insertion into a pipeline (K) in which fluid circulates in an upstream (X?) and a downstream (X+) direction, comprises a tube (1) that provides the fluid with a central circulatory passage (CC) regulated by a central valve (3) that closes in the event of an excessive flow of this fluid. There is an annular valve closure member (4) which is elastically malleable, mounted to the external periphery of the tube (1), and provides the fluid with a peripheral circulatory passage which it selectively obstructs by subjecting a radial expansion in the event of an excessive flow of fluid.

Abstract: Method in which the following operations are carried out: a) digging an exploration hole (8) in order to open up a main pipeline (2) which has an upper edge (10) which extends at an upper level (12) which is substantially constant relative to the ground (6), b) using a branch connection (14) which has a support surface (16) and a shaft (18) to which the branch pipe is connected, c) positioning the support surface (16) of the branch connection (14) against the main pipeline (2) so that the shaft (18) is below the upper level (12) of the main pipeline (2), d) fixing the branch connection (14) to the main pipeline (2), e) placing the branch pipe and the main pipeline (2) in communication, f) refilling the exploration hole (8), whilst keeping the branch pipe below the upper level (12) of the main pipeline (2).

Abstract: A method for evaluating the Wobbe index of a fuel gas belonging to a family of gases. The method includes measuring mass flow rates the fuel gas and of a reference gas, which is not necessarily a fuel gas at respective absolute pressures and temperatures and in a sonic flow through a microjet. An evaluation of the Wobbe index (W) of the fuel gas as W=A×Y+B uses the results of measurements of the fuel gas and the reference gas and is established for all the gases of the family considered.

Abstract: A method of transmitting information between a salt-cavern and the surface of the ground, the cavern being drilled in geological formation beds and being connected to the surface via an access borehole cased at least in part by metal tubes and presenting at least one safety valve, the method consisting in suspending a string of tools from a hanger system positioned in the access borehole downstream from the safety valve and in electrical contact with the metal tubes, the string of tools including at least one measuring device connected to the hanger system via a first segment of conductor cable and an information transceiver operating by means of waves and connected to the measuring device via a second segment of conductor cable, the transceiver being positioned in such a manner as to be in contact with structural means linked to the cavern; and establishing coupling between the transceiver and the structural means, in order to enable information to be transmitted between the measuring device and the surface

Abstract: The invention concerns an identification process that makes it possible to confer traceability to manufactured products (PROD), from data of origin (C, D) initially brought together at a source point (P_SOURCE) and including a control identification number (C) and manufacturing data (D) common to these products (PROD).

Abstract: An operating well of a fluid storage reserve, includes an outer wall delimiting, with a central operating tubing of the well, an annular space in which is placed a protective sheath of an electrical link cable between a surface installation and elements arranged in the well. A device for the measurement of physical parameters includes at least one compact, removable, sealed measuring subassembly arranged in a housing in communication with the interior of the central tubing and at least one compact, sealed connecting subassembly integral with the central tubing of the well and arranged at least partially in the annular space in the vicinity of the protective sheath to be connected to the electrical link cable. The sealed measuring subassembly and the sealed connecting subassembly have plane contact surfaces, each associated with a half-transformer so as to form an inductive coupling between the measuring subassembly and the connecting subassembly.

Abstract: A method for automatic analysis of signals acquired by one or more elastic or acoustic wave pickups to automatically locate with high precision, at least one significant instant such as the time of first arrival on each pickup (ti) and/or the end time (tf) of these signals. The method comprises determining the pseudoperiod corresponding to the inverse of the dominant frequency of the frequency spectrum of each acquired signal, coding each acquired signal so as to form a binary coded signal in reference to a first threshold value depending on the acquired signal, forming for each of them an integral signal by stacking of the binary coded signal on a sliding window in order to determine a second threshold value, and positioning the significant instant sought (ti, tf) on each acquired signal in reference to an instant where the corresponding integral signal reaches this second threshold value.

Abstract: The invention relates to a radiant device with a burner of the “glove finger” type, comprising an exchanger (3) for heating air (T1) by the burned gases (T2), a furnace tube (6) drilled with air-intake orifices (60) and terminated by a nozzle (61) disposed facing a recirculation tube (4), and a central gas-injection tube (7). According to the invention, the central injection tube (7) is fed with gaseous fluids in proportions that can be regulated by means of one or two valves (710, 720), via two conduits (71, 72), the first (71) of which transports at least gas and the second (72) of which transports at least air, and the central injection tube (7) ends at a burner (8), which is disposed in the furnace tube (6) and which discharges at the level of the nozzle (61), this arrangement making it possible to adapt existing devices very easily for the purpose of reduced production of nitrogen oxides.

Abstract: Seismic wave reception device comprising a hydrophone and/or a geophone and method for coupling it (or them) with a solid medium such as the subsoil. The device comprises at least one hydrophone (2) immersed in a closed flexible-walled sheath (7) filled with liquid (8) that is closed at one end by a sealed plug (9) provided with a sealed duct for a cable (10) connecting the hydrophone to a signal acquisition means (E). The sheath is arranged in a cavity (6) and tightly coupled with medium (5) substantially over the total surface thereof, preferably by means of a hardenable material such as cement. A geophone can be placed in the same coupling material in the vicinity of sheath (7) containing hydrophone (2). Application: seismic prospecting or monitoring operations in an underground formation, notably in order to discriminate the seismic upgoing and downgoing waves.

Abstract: The apparatus for detecting the presence of a particular gas within a mixture of gases comprises first and second emitter means for emitting measurement and reference electromagnetic radiation beams respectively, which beams are activated in alternation, a measurement cell, a filter cell, first and second detector means for detecting electromagnetic radiation beams, a beam splitter, and acquisition and processing means for synchronously acquiring and processing the four signals US1, US2, UR1, UR2 delivered by the first and second detector means in succession when the first and second emitter means are respectively activated so as to determine the absolute concentration of the gas to be detected on the basis of the ratio R=(US1×UR2)/(US2×UR1) between the four signals, in which US1 and US2 respectively represent the signals delivered by the first and second detector means when the first emitter means is activated, and UR1 and UR2 respectively represent the signals delivered by the first and s

Abstract: The invention relates to a radiant device with a burner of the “glove finger” type, comprising an exchanger (3) for heating air (T1) by the burned gases (T2), a furnace tube (6) drilled with air-intake orifices (60) and terminated by a nozzle (61) disposed facing a recirculation tube (4), and a central gas-injection tube (7).

Abstract: The invention concerns a manual scraping device (10) by rotation about the external surface of a tube (112) of plastics material, comprising an annular structure (11) having a passage (20) which is to receive the tube in order to guide it and a blade (30) secured to the annular structure (11). The passage extends right through the annular structure and is partially obstructed by a shoulder (50) defining a region (52) for restricting the passage, so that the shoulder defines an abutment for a non-scraped portion of the tube and permits the passage of a scraped portion of the tube through the restriction.

Abstract: The invention concerns a method for producing a flame support for a gas burner, which consists in producing disjointed metal fibres (10) in an alloy comprising iron, chromium and aluminium; assembling the fibres together under pressure; bringing the fibre mat to a temperature sufficient to ensure a close bonding between the fibres. The invention is characterised in that it consists in feeding said metal alloy to an overflowing tank (3), to produce the fibres by cooling in contact with a mobile wheel (7); then in arranging in a moulding matrix the resulting disjointed fibres (10) and compressing them to form an agglomerated mat; then in connecting the mat to electrodes and a capacitor, thereby bringing the fibres (10), at their points of contact, to a temperature not less than their melting point, to produce fibres closely welded together, under high voltage.

Abstract: The invention relates to a method in operating a lined cavern provided for the storage of gas coming from a pipeline. During filling of the cavern with gas to a nominal pressure, at least a portion of the gas is withdrawn from the cavern and recirculated to the cavern under cooling and without substantial compression. The method also includes recirculating the gas under heating and without substantial compression.

Abstract: Compact vibrator for emitting elastic waves in a material medium such as the subsoil. The vibrator comprises a baseplate (3) intended to be coupled in operation with a surface of this medium, an inertia mass (5) and at least a pair of electromechanical transducers (1, 2) comprising each one or more pillars (A, B) made for example of a piezoelectric or magnetostrictive material. Pillars (A) of first transducer (1) are interposed between baseplate (3) and a relay plate (4). Pillars (B) of the second transducer are interposed between relay plate (4) and inertia mass (5), on the same side of relay plate (4) as pillars (A) preferably, so that inertia mass (5) is positioned in the vicinity of baseplate (3), which contributes to the compactness and to the stability of the vibrator that can therefore be used on slightly sloping surfaces.

Abstract: A safety device for protecting a fluid pipeline (1) from an excessive flow of the fluid running through it. The device includes a body (2) delimited by a tubular wall (20), having an upstream end (21) and a downstream end (22) and being selectively inserted into the pipeline (1). A valve (3), which is sensitive to a pressure loss, is supported by the body (2) and disposed between the upstream and downstream ends. A retaining means (4a, 4b) holds the body (2) in place inside the pipeline (1). An inflatable envelope (5) is provided outside the body for impermeably encasing a section of effective length of the tubular wall (20) into which at least one first opening (231) is cut.

Abstract: The invention relates to a device for positioning and holding together a secondary pipe on a branch connector before the branch connector is mounted on a buried main pipe for transporting fluid. The device rests solely on the secondary pipe and on the branch connector away from the main pipe.

Abstract: The device for metering the volume of gas flowing in a pipe, downstream from an expander-regulator, comprises in succession a flow straightener, a velocity-measuring flowmeter, and a silent flowrate limiter. The straightener comprises a support ring in which there are mounted a first perforated plate having holes distributed over its surface, together with a first porous plate and a spacer in the form of an annulus co-operating with the first perforated plate. The limiter comprises an upstream web defining a second perforated plate perforated by a defined number of calibrated holes, the total flow section thereof being much less than the total flow section of the first perforated plate, a second perforated plate, and a downstream web defining a third perforated plate having holes of total flow section that is much greater than the total flow section of the second perforated plate of the upstream web.