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| Number | Title | Issue Date |
| 4756887 | Process of heap leaching The present invention relates to a new process of heap leaching and comprises the following steps: (a) preparing the ground to receive the heap; (b) forming the heap; (c) sinking injection wells into the heap; (d) injecting the leaching solution by means of injecti... | 07/12/1988 |
| 4721413 | Marine platforms A marine platform comprising a structure composed of a lattice of tubular elements sealingly connected to one another, includes a crack detection system comprising pickups provided on at least some of the elements and adapted to detect the passage of flui... | 01/26/1988 |
| 4706225 | Process for obtaining and processing seismic data measured at an exploratory well In a process for obtaining seismic data relating to an exploratory well, a seismic wave transmitter and a seismic wave receiver are provided, one arranged on the surface adjacent the well and the other at a plurality of measurement points down the well, a... | 11/10/1987 |
| 4671704 | Coastal installation for loading or unloading liquid at cryogenic temperature A coastal installation for loading or unloading liquefied natural gas comprises a fixed tower installed on a seabed close to a coast and carrying at the top a rotating mooring arm and a rotating loading arm. Cryogenic pipes connect the coast to the tower,... | 06/09/1987 |
| 4646025 | Magnetic probe exploration device for determining residual fossil magnetization of well hole rocks Apparatus for continuously recording, as a function of the depth, the residual magnetization of the rocks through which a well hole passes, comprising, on the one hand, a measurement probe which contains means for measuring the magnetic susceptibility and... | 02/24/1987 |
| 4625795 | Geomechanical probe for a drilling well A geomechanical probe for a drilling well comprises a logging box located between two inflatable preventers and including a plurality of tracers movable radially and urged outwards by springs for engaging the well wall. The tracers are mounted on pistons ... | 12/02/1986 |
| 4624281 | Control valve A control valve comprises a body having a fluid inlet and a fluid outlet and a rotary member provided with two separate internal passages, each capable of connecting the fluid inlet to the fluid outlet, according to the angular position of the rotary memb... | 11/25/1986 |
| 4613347 | Water deaeration process A process for deaerating water in an upright column immersed in a body of water and equipped at its lower end with an electrical pump which, essentially, provides the water lift in the column, comprises injecting into the upright column, at at least one i... | 09/23/1986 |
| 4609214 | Thermally insulated fluid transport line A fluid transport line comprising coaxial inner and outer metal pipes, the inner pipe of which is intended to transport a thermally insulated fluid, is formed by successive sections, the inner and outer pipe portions of which are connected by means of met... | 09/02/1986 |
| 4597446 | Safety valves for wells A safety valve for installation in a well to close the passage for effluent therefrom comprises a valve body of generally cylindrical shape, shut-off element in a lower part of this body, and a cylindrical slideblock which is slidable longitudinally in th... | 07/01/1986 |
| 4583603 | Drill pipe joint A drill pipe joint for insertion in a drill pipe comprises a body having an axial bore therethrough and comprising generally cylindrical upper and lower portions and a widened cylindrical intermediate portion at the upper end of which at least three cutou... | 04/22/1986 |
| 4576193 | Device for working on a submerged valve Apparatus for servicing a submerged valve 4 comprises a lower vertical box 13 fixed to the valve body 3, surrounding the valve actuating rod 9 and open at its upper end, and an upper box 19 open at its lower end which contains a lifting winch 28, a screwi... | 03/18/1986 |
| 4566541 | Production tubes for use in the completion of an oil well A connector for incorporation in a production tube for an oil well, below the packer, comprises a closing flap which closes when a first retractable ball seat is displaced downwards, in order to provide a safety device during the installation of the well ... | 01/28/1986 |
| 4561248 | Hydraulic shock-absorbing jack A hydraulic shock-absorbing jack particularly for use underwater comprises a cylinder 1 in which a piston 20 associated with an actuated rod 23 is slidable. The piston defines within the cylinder a first actuating chamber 6 provided with a first inlet 2 f... | 12/31/1985 |
| 4560005 | Sliding-sleeve valve for an oil well A sliding-sleeve valve for an oil well comprises a valve body provided with ports for the passage of fluid therethrough, and a longitudinally slidable sleeve for opening and closing the ports. The sleeve is located on the outside of the valve body and pro... | 12/24/1985 |
| 4553600 | Safety installation for a submerged drilling well-head A safety installation for a well-head located on the sea bottom comprises an emergency unit mounted on the well-head below the well shut-off units and including a complete-closure shut-off device controlled by sound transmission and by an intervention liq... | 11/19/1985 |
| 4526596 | Process for recovering butane and propane from crude gas In a process for recovering or fractionating a mixture composed mainly of butane and propane and present in a crude gas, using an external mechanical cooling loop, the mixture itself constitutes the cooling fluid in the loop and the loop comprises a compr... | 07/02/1985 |
| 4520886 | Rotary drilling tool with percussion device A hollow rotary drilling tool is equipped with a percussion device which comprises a nozzle comprising a cylindrical annular duct followed by a divergent annular duct. The divergent duct opens into flow paths, a central path and a peripheral path, through... | 06/04/1985 |
| 4518036 | Device for controlling a safety valve disposed below an activation pump in a hydrocarbon production well In a hydrocarbon production well in which the effluent is activated by an activation pump installed in a production pipe, a safety valve is disposed in the production pipe below the pump, the safety valve being operated by lowering of an operating member ... | 05/21/1985 |
| 4506863 | Automatic hydraulic connectors An automatic hydraulic connector for connecting an hydraulic pipe to apparatus comprises a female cylindrical receptacle for connection to the apparatus and a retractable hollow male cylindrical body releasably lockable by locking means to the receptacle,... | 03/26/1985 |
| 4497640 | Process for the dehydration of gases containing hydrocarbons In a process for the dehydration of gases by permeation through a membrane of selective permeability, the membrane comprises a bundle of hollow fibres based on polymers and open at both ends, the methane permeability of which is at least 10-5 c... | 02/05/1985 |
| 4493966 | Internal mandrel used in an operation of butt joining two lengths of tubing by welding An internal mandrel (22) cooperating in the operation of joining two successive lengths of tubing by welding, and it is characterized in that this mandrel comprises zones (25, 26, 27) separated longitudinally and serving respectively for matching, welding... | 01/15/1985 |
| 4485344 | Apparatus for electromagnetically measuring the ovalization of a ferromagnetic pipe The invention relates to the measurement of the ovalization of a ferromagnetic pipe. An electromagnetic pickup is moved in a circular path around the pipe, the pickup transmitting signals influenced by the radial distance between the pickup and the pipe. ... | 11/27/1984 |
| 4476605 | Rotary metal brush for removing submerged anti-corrosive covering and method for using the same The present invention relates to a heavy-duty metal brush particularly, but not exclusively, for removing anti-corrosion materials from an immersed metal surface. The brush comprises a compact assembly of radial strands of, for example, steel wire, which ... | 10/16/1984 |
| 4464057 | Recovery and treatment of viscous petroleum emulsions Apparatus for use in the treatment and recovery of viscous petroleum emulsions comprises a leaktight chamber in which a reduced pressure is established, the chamber having an inlet connected to a feedpipe for sucking up emulsion. A mixer is connected on t... | 08/07/1984 |
| 4463652 | High-speed braiding An overcoatable machine-made braid may be formed at high-speeds and directly from producer's low-twist, single-yarns of continuous filament, inorganic materials by this process which treats the yarn prior to or during braiding with a lubricant liquid. The... | 08/07/1984 |
| 4460295 | Submersible connector The invention relates to a connector for taking over control of a submerged tool. The connector comprises two parts, a first part mounted on the tool, and a second part mounted on a movable control appliance. The tool is provided with energy distributors ... | 07/17/1984 |
| 4447340 | Method of tracing a well drilling mud In a method of tracing a well drilling mud by determining the concentration of a tracer ion in samples of filtrate from a drilling mud which contains a predetermined concentration of the tracer ion, the improvement wherein the tracer ion is the acetate io... | 05/08/1984 |
| 4444251 | Combined installation comprising an activation pump and a safety valve disposed below this pump, in a hydrocarbon production well In a hydrocarbon production well in which effluent is activated by an activation pump installed in a production pipe in the well, a safety valve is disposed in the production pipe beneath the pump and is controlled for opening purposes by a control chambe... | 04/24/1984 |
| 4442867 | Internal obturators for pipes The invention relates to an internal obturator for a pipe for use in separating two spaces inside a pipe. The obturator comprises a rigid hollow body comprising two end plates connected by a cylinder having a lesser diameter than the end plates between wh... | 04/17/1984 |
| 4443129 | Method and apparatus for tapping a submerged pipe A process for tapping a region of a pipe placed on a sea bed utilizes a working platform which is installed vertically above the region of the pipe to be tapped, the platform being adapted to receive a support girder which can be lowered from the surface ... | 04/17/1984 |
| 4440524 | Process for bringing a body of water into communication with a tunnel The invention is concerned with a process for bringing a body of water into communication with a tunnel extending under the bed of the body of water. A cavity is excavated under the end of the tunnel adjacent the body of water, to a depth such that the vo... | 04/03/1984 |
| 4436120 | Inflatable internal pipe obturator with hardenable core The invention relates to an internal obturator for a pipe, particularly for a hydrocarbon conveying pipe-line, which comprises a central core and a flexible inflatable sleeve surrounding the core, wherein the central core comprises a flexible casing fille... | 03/13/1984 |
| 4430550 | Electron beam welding The characteristics of a weld made by electron beam welding are improved by introducing into the region of the pieces to be welded, which is subjected to remelting during welding, a material which is obtained by applying an arc welding process, or a proce... | 02/07/1984 |
| 4424862 | Injection devices The invention relates to a device for injecting a liquid product, at a low flow rate, into the bottom of a hydrocarbon-producing well. The device comprises an injection valve and, above the injection valve, at least one settling tank through which the liq... | 01/10/1984 |
| 4425059 | Process for removing a concrete covering The invention concerns the removal of a concrete covering applied to an underlying surface provided with an anti-corrosion coating, for example that of a hydrocarbon-conveying pipe. The coating is removed by making trenches in the concrete to divide it into ... | 01/10/1984 |
| 4410210 | Retaining grippers A soft retaining gripper for gripping a surface while stresses are exerted in a longitudinal direction parallel to the surface between the gripper and the surface, comprises a jaw and an inflatable flexible bladder carried by the jaw, the bladder being in... | 10/18/1983 |
| 4370541 | Electron beam chamber for butt welding pipes An electron beam welding chamber for butt joining elongate members 1,2 extending longitudinally at the center of the chamber. The chamber comprises an envelope 7 defining the welding enclosure 6 and which rests on a fixed structure 8. The electron gun equ... | 01/25/1983 |
| 4368374 | Vacuum chamber for electron beam butt welding of pipes A welding chamber in which a vacuum is created for welding, using an electron beam, elongate pieces extending centrally of the chamber. The welding chamber is divided into a central sub-enclosure 41 for receiving the pieces 1, 2 to be welded and which is ... | 01/11/1983 |
| 4358656 | Electron beam welding The characteristics of a weld made by electron beam welding are improved by introducing into the region of the pieces to be welded, which is subjected to remelting during welding, a material which is obtained by applying an arc welding process, or a proce... | 11/09/1982 |
