摘要:
An insulating collar for a gap sub assembly for electromagnetic (EM) telemetry used in downhole drilling is disclosed. The gap sub assembly comprises a female member comprising a female mating section and a male member comprising a male mating section and a gap section. The male mating section is matingly received within the female mating section and electrically isolated therefrom. The insulating collar is positioned on the gap section. The collar is made up of a framework with a plurality of discrete bodies spaced about the framework and a portion of each of the discrete bodies protrudes above the framework. Either the framework or the discrete bodies are made of an electrical insulator material to electrically isolate one end of the collar from the other end of the collar. The collar therefore electrically isolates the male member from the female member and the male member, female member and insulating collar function as the “gap sub” for EM telemetry.
摘要:
The present application is directed to dielectric isolators for use in aircraft fuel systems to control lightning induced current and allow dissipation of electrostatic charge. The dielectric isolators are configured to have a high enough impedance to limit lightning currents to low levels, but low enough impedance to allow electrostatic charge to dissipate without allowing buildup. Although the dielectric isolators may develop a potential difference across the dielectric length due to the effects of lightning currents and its inherent impedance, they are configured to withstand these induced voltages without dielectric breakdown or performance degradation. In one embodiment, the dielectric isolator includes a tube constructed of a composition including a thermoplastic organic polymer (e.g., PEEK) and carbon nanotubes, and a pair of fittings attached to opposing ends of the tube. In another embodiment, the dielectric isolator includes a tube, an outer annular portion, and an interconnecting web, each constructed from the composition including a thermoplastic organic polymer (e.g., PEEK) and carbon nanotubes. This later embodiment is an integrally formed one-piece structure. The dielectric isolator is capable of exhibiting an electrical resistance from about 105&OHgr; to 108&OHgr; at an applied potential of greater than 500 volts DC when measured from one fitting to the other fitting.
摘要:
Sous-ensemble d'interstice d'un collier de trepan isole pour un systeme de telemetrie a accouplement toroidal comprenant un premier sous-organe annulaire (150) pouvant etre actionne pour etre connecte a une extremite a un collier de trepan et un sous-organe annulaire (156) pouvant etre actionne pour former une partie d'un sous-ensemble d'un collier de trepan. Le premier et le second sous-organes annulaires ont des organes de structure d'interconnexion (54, 58) pouvant fonctionner pour interferer structurellement. Les organes de structure d'interconnexion sont dimensionnes pour former un interstice continu (160) entre des surfaces mutuellement opposees et un materiau dielectrique (162) remplit l'interstice pour isoler electriquement le premier sous-organe annulaire par rapport au second sous-organe annulaire. Un organe de palier (164) est positionne entre le premier organe annulaire et le second organe annulaire et est revetu d'une isolation dielectrique (166) pour faciliter la formation d'un sous-ensemble d'un interstice de collier de trepan ayant une integrite structurelle et electrique.
摘要:
A coupling device for coupling a threaded feed-through (113) of a process connection to provide a launcher for a non-metallic storage tank (102). The storage tank includes a tank aperture (103) in its top surface (102a). The coupling device includes a foil nozzle including an inner upper metal foil surface (105) that includes a threaded aperture (106) for securing the feed-through thereto, and a first and second lower metal foil surface (115, 116) on respective sides of the upper metal foil surface. The foil nozzle also includes a first and a second foil level transition region (111, 112) disposed between the respective sides of the inner upper metal foil surface and the first and second lower metal foil surface. The foil nozzle can be configured in a cylindrical, horn, or a corrugated horn shape.
摘要:
A gap sub comprises at least one electrically isolating threaded joint in a conductive tubular collar. The threads of the joints are isolated by a non-conductive coating. The shoulders of the joints are separated by an isolating ring. Annular faces on the ring make contact with the shoulders in the joints. The ring is made of conductive material with a non-conductive coating deployed on (1) at least one of the ring's annular faces, and (2) the interior surface of the ring. An annular recess in the collar prevents electrical contact between collar sections nearby the ring on either side of at least one threaded joint.
摘要:
An insulating collar for a gap sub assembly for electromagnetic (EM) telemetry used in downhole drilling is disclosed. The gap sub assembly comprises a female member comprising a female mating section and a male member comprising a male mating section and a gap section. The male mating section is matingly received within the female mating section and electrically isolated therefrom. The insulating collar is positioned on the gap section. The collar is made up of a framework with a plurality of discrete bodies spaced about the framework and a portion of each of the discrete bodies protrudes above the framework. Either the framework or the discrete bodies are made of an electrical insulator material to electrically isolate one end of the collar from the other end of the collar. The collar therefore electrically isolates the male member from the female member and the male member, female member and insulating collar function as the “gap sub” for EM telemetry.
摘要:
A gap sub comprises at least one, and in a preferred embodiment, two electrically isolating threaded joints in a conductive tubular collar. The threads of the joints are isolated by a non-conductive coating in accordance with the prior art. The shoulders of the joints are separated by an isolating ring. Annular faces on the ring make contact with the shoulders in the joints. The ring is made of conductive material with a non-conductive coating deployed on (1) at least one, and advantageously both, of the ring's annular faces, and (2) the interior surface of the ring. An annular recess in the collar prevents electrical contact between collar sections nearby the ring either side of each threaded joint.
摘要:
Le raccord comporte une première pièce de raccord métallique (1) reliée par des moyens d'assemblage (5, 9) à une deuxième pièce de raccord métallique (2), la première pièce (1) étant à l'une de ses extrémités pourvue d'un manchon (5) logeant une bride (9) sur la deuxième pièce (2), avec interposition de moyens diélectriques annulaires (3) interdisant tout contact direct entre les première et deuxième pièces de raccord (1, 2), la paroi du manchon (5) de la première pièce (1) étant rabattue par sertissage sur les moyens diélectriques (3). Les moyens diélectriques entre les première et deuxième pièces sont constitués par une rondelle à jupe (3) d'un seul tenant en un matériau élastiquement déformable. Le raccord peut être utilisé pour le raccordement d'un chauffe eau, d'un ballon ou d'un équipement de plomberie à des canalisations.