JOINT METAL SUR METAL

• Main Author: JOHN KENT MCGEE, HAROLD LEWIS LAFFERTY, CHARLES DANIEL BRIDGES ET ARCHIE L. SMITH
• Format: Patent
• Language: French
• Published: 05.08.1983
• Subjects: BLASTING; CYLINDERS; EARTH DRILLING; EARTH DRILLING, e.g. DEEP DRILLING; ENGINEERING ELEMENTS AND UNITS; FIXED CONSTRUCTIONS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; LIGHTING; MECHANICAL ENGINEERING; MINING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS; PISTONS; SEALINGS; THERMAL INSULATION IN GENERAL; WEAPONS

DE MANIERE A OBTENIR UN JOINT ANNULAIRE METAL SUR METAL, DESTINE A ETRE UTILISE DANS UN ENVIRONNEMENT A HAUTE PRESSION TYPIQUE D'UNE TETE DE PUITS DE GAZ OU REGNENT DES HAUTES PRESSIONS ET DES TEMPERATURES ELEVEES, PLUS PARTICULIEREMENT SUR LA CIRCONFERENCE ENTRE LA SURFACE EXTERIEURE D'UNE PARTIE TUBULAIRE 66 DE 52 OU 28ET LA SURFACE INTERIEURE D'UNE PARTIE RELATIVEMENT MASSIVE 54 OU 22, OU CES PARTIES DOIVENT AVOIR EN MARCHE UNE POSITION LONGITUDINALE FIXE L'UNE PAR RAPPORT A L'AUTRE: ON DETERMINE LA RESISTANCE DISPONIBLE POUR DEVELOPPER LE JOINT; ON PREVOIT DES SURFACES CONIQUES IDENTIQUES SUR LES DEUX PARTIES DE MANIERE A FORMER UN AJUSTEMENT SERRE LORSQUE LES DEUX PARTIES SONT AMENEES A PRENDRE LEUR POSITION LONGITUDINALE FIXE; ON USINE DES PARTIES DE LA SURFACE EXTERIEURE DE LA PARTIE TUBULAIRE POUR OBTENIR DES SURFACES PLANES CONIQUES, PAR EXEMPLE, SOUS FORME DE DEUX BANDES PROCHES DANS LE SENS AXIAL B1 OU B2 DE SORTE QUE, LORSQUE LES DEUX PARTIES SONT AMENEES A PRENDRE LA POSITION LONGITUDINALE FIXE, LES BANDES CONSTITUENT UN JOINT ELASTIQUE QUI EVITE UNE DEFORMATION PLASTIQUE TOTALE TOUT EN ASSURANT LA CHARGE UNITAIRE REQUISE. L'INVENTION PEUT ETRE UTILE DANS DE NOMBREUX TYPES D'ANNEAUX D'ETANCHEITE TRONCONIQUES. In order to provide a metal-to-metal annular seal for use in a high pressure environment typical of a wellhead assembly that is provided on a high pressure, high temperature gas well, especially circumferentially between the outside surface of a tubular part and the inside surface of a relatively massive part, where these parts are to have a fixed longitudinal position relative to one another in use: the available strength for developing the seal are determined; like tapering surfaces are provided on the two parts such as would provide an allowable interference fit when the two parts are brought to the fixed longitudinal position; portions of the outside surface of the tubular part are machined-away to leave tapered land areas, e.g. in two axially closely spaced bands, so that when the two parts are forced to assume the fixed longitudinal position, the seal bands provide an elastic seal that avoids total plastic deformation yet provide the required unit loading. The invention is useful on many types of frusto-conical sealing annuli.