Abstract: A process is provided for the improvement of the sulphur yield of an assembly which produces sulphur from H.sub.2 S and which consists of a sulphur plant (1), an oxidation and hydrolysis unit (2) and a purification unit (3). The sulphur plant in producing sulphur provides a residual gas which incorporates H.sub.2 O, COS and/or CS.sub.2 and H.sub.2 S and SO.sub.2 in a mol ratio of H.sub.2 S:SO.sub.2 >2:1. The residual gas passes into the hydrolysis unit on a H.sub.2 S oxidation and COS and CS.sub.2 hydrolysis catalyst which functions between 180.degree. C. and 700.degree. C., in the presence of air, thus producing a residual gas free of COS and CS and incorporating H.sub.2 S and SO.sub.2 in a mol ratio which is kept equal to 2:1 by regulating the air flow. The residual gas is introduced into the purification unit in which H.sub.2 S and SO.sub.2 are made to react in order to produce sulphur and to obtain a purified residual gas.

Abstract: An absorbent liquid having an improved absorption capacity for acidic gaseous compounds due to the presence of an activator of tertiary alkanolamines. The activator is butylmonoethanolamine (BMEA). A process utilizing the absorbent liquid to remove acidic gaseous compounds from a gas.

Abstract: A dynamometric measuring device for a drill pipe which includes, firmly attached to the rotating pipe, sensors disposed in a groove on the pipe and electronics for conditioning the signals supplied by the sensors. The measurement signals are transmitted by a commutator-fixed brush assembly to a fixed, non-rotating part. By providing follower-amplifiers of very low output impedance on the commutator, rotating, portion of the assembly and follower-amplifiers of very high input impedance on the fixed brush side of the assembly, the transmission of signals is carried out at zero current. To assure high quality signal analysis, a separation circuit on the fixed brush side of the assembly separates the DC and AC components of the signal prior to transmission to the surface.

Abstract: Process for the simultaneous decarbonation and gasoline stripping of a gaseous mixture at an absolute pressure higher than 0.5 MPa containing methane, C.sub.2 and higher hydrocarbons and CO.sub.2 in which a demethanized rich solvent is regenerated so the process can be carried out more easily and at lower costs than previously known systems.

Abstract: A method for transmitting data from the bottom of a well to the surface is disclosed. The method includes measuring data indicative of at least one drilling condition at the bottom of a well, transmitting into a stream of drilling mud injected into a well pipe string a series of encoded pressure pulses representative of the data measurement, and detecting the encoded pulses at the surface using a pressure sensor which is in communication with the stream of drilling mud as it is being injected into an inlet of the pipe string. The method also includes, as a way of improving data detection, using a surface sensor to measure vibrations in the pipe string which are generated as a result of the propogation of the encoded pulses through the drilling mud.

Abstract: A method for determining the rotation speed of the drill bit arranged at one end of a rotating drill string. According to the method, the axial acceleration at one point on the drill string is measured, this measurement is processed with a multiplying coefficient which depends upon the point on the drill string where the measurement is taken to determine the rotational speed of the drill bit.

Abstract: A method for plotting the surfaces in a 3D volume configured in the form of columns distributed over the nodes of a grid with the aid of 2D plotting algorithms by classifying the columns by way of a Peano-Hilbert curve.

Abstract: A hydrocarbon extractor, intended to be disposed above a tank (10) containing a mixture of a liquid and a liquid hydrocarbon, comprises a belt (16) made of an oleophilic material which is adapted to be immersed in the mixture and two oleophilic rollers (26, 28), disposed one on each side of the belt, for recovering the liquid hydrocarbon from the belt. The rollers are rotated in an opposite direction to that of the movement of the belt and at a higher speed than the belt to enhance the recovery process.

Abstract: Method for conducting an oil drilling operation, during which a drill-stem produces the rotation of a tool in an oil well. The method consists of the following steps: continually measuring the rotational speed of the upper end of the drill-stem; continuously measuring the torque applied to that end of the drill-stem; determining the torque applied to that end of the drill-stem; determining the torque variation; establishing the period of torque variation if the amplitude of the variation exceeds a predefined threshold; verifying the stability of this period; comparing the latter, if stable, with at least one predefined theoretical period; and reporting the results obtained to the user in order to control the drilling operation.

Abstract: Electromagnetic source intended to be placed permanently in a drill well for studying the electromagnetic properties of the geological formations or of the fluids surrounding the well. This source consists of a coil through which a high current is circulated and which is of a diameter of the order of magnitude of the diameter of the well and is integrated in one of the elements of the casing produced at least partially from a resistant material in which the coil is embedded. This source can either be activated directly by a conductor shoe moving along in the well or be connected to a supply by means of cables.

Abstract: A production tube which includes at least one substantially tubular tube element and a hydraulic line. The tube element is provided with a longitudinal groove for receiving the hydraulic line.

Abstract: A submarine wellhead (10) for producing wells, including a hollow body (14) mounted in a water-tight fashion on a well (16) configured to receive a suspension device (30) equipped with a production column (26) designed to be lowered down into the well, which body (14) is also equipped with an outlet port (20) for the oil coming up from the well through the production column (26), hydraulic flow between the production column (26) and the outlet port (20) occurring through the suspension device (30), and hydraulic flow being ensured regardless of the rotation position of the suspension device (30) in relation to the body (14).

Abstract: A well probe including two offset shoes fixed outside of a tubular column and an intermediate shoe provided with a central passage having a cross section larger than a cross section of the column. The intermediate shoe is connected to a lower offset shoe by a mobile hasp. A mobile harness is adapted to be moved into and out of a lateral cavity of the intermediate shoe for enabling coupling and uncoupling of the intermediate shoe with a wall of the well. The mobile harness includes a casing for accommodating sensors and a hydraulic triggering arrangement, with the sensors and the hydraulic triggering arrangement being connected to a surface installation by cables and an electronic cartridge.

Abstract: A method of processing seismic recordings in order to obtain an improved seismic section by taking into account, during summing, the real geometric configuration of the alignments of signals in the collection of elementary recordings before sum.

Abstract: The present invention relates to a process for pumping a two-phase gas/liquid mixture in an extraction well (11) whose initial gas percentage is greater than approximately 40% by volume, characterized in that it consists:in reducing the percentage of free gas to below 40% by the use of at least a first centrifugal separating module (3, 4);in cooling the drive motor by means of an annular flow of the mixture emerging from the first separating module (3, 4) around the motor (9), the proportion of gas in the said mixture having been brought down to below 40% in order to increase its heat capacity and its speed of passage around the motor;in reducing to below approximately 10% the percentage of gas by volume by the use of at least a second centrifugal separating module (14);in pumping the fluid thus obtained by means of a centrifugal pump (16) driven by the motor (9).

Abstract: The invention relates to the manufacture of thiophene by catalytic dehydrogenation of tetrahydrothiophene.Ruthenium sulphide, optionally mixed with sulphides of one or more other transition metals is employed as bulk or supported catalyst.

Abstract: A process for the preparation of alkanesulfonamides is disclosed. It comprises reacting an alkanesulfonyl chloride with ammonia or with an alkylamine in the presence of a chemically inert liquid diluent. The diluent is first supersaturated with ammonia or with the alkylamine before bringing it into contact with the alkanesulfonyl chloride.

Abstract: Method has been provided for cleaning a vertical, deviated or horizontal underground well. In which a maintenance tubing having a cleaning head at its end is lowered into a production pipe for suction of sediments. At a certain level above the region of the well to be cleaned, a hydraulic isolation device is installed in the annulus between the maintenance tubing and the production pipe. Fluid is injected into the annulus to activate the hydroejector which is located above the hydraulic isolation device to cause the suction of the sediments. The sediments downhole therefore can be cleaned out without introducing foreign fluid downhole.

Abstract: Dynamometric measuring assembly for a drill pipe, formed by a measuring device comprising, firmly attached to the rotating pipe, sensors and a first electronic circuit for conditioning the signals supplied by these sensors, a radiotransmitter mounted in a fixed manner on the rotating pipe and an acquisition unit. According to the invention, the measuring assembly furthermore comprises a radio receiver mounted on the rotating pipe and intended to allow the remote control of the measuring device.

Abstract: Device for the auditory and/or visual representation of mechanical phenomena in the interaction between a drilling tool and rock being drilled, characterized by the fact that it includes a mechanism for picking up a vibratory signal representing the vibration of the tool at the cutting face using an accelerometric sensor at a specific point on the drilling stem and processing equipment (45, 31, 31) for filtering the signal in the frequency band of 10 to 200 Hz.