Insulative gap sub assembly and methods

Details Insulative gap sub assembly and methods Insulative gap sub assembly and methods

E - Fixed Constructions

21

B

E21B 17/00 (2006.01) E21B 47/12 (2006.01)

Patent

CA 2508374

Devices and methods for incorporating a gap sub assembly into a drill string to electrically isolate portions of a transmitter assembly within, for example, an MWD tool located within the drill string. The gap sub assembly incorporates upper (34) and lower (36) subs having an insulated interconnection. A central conductor assembly (40) is axially disposed within the lower sub and does not extend through the length of the gap sub. The central conductor assembly is used to transmit electrical power and data across the gap sub assembly between the upper portions of the drill strings and transmitter components housed within the MWD tool disposed below the gap sub assembly.

Cette invention concerne des dispositifs et des procédés permettant d'intégrer un sous-ensemble d'espace isolant dans un train de tiges dans le but d'isoler électriquement certaines parties d'un ensemble émetteur à l'intérieur, par exemple, d'un outil de télémétrie (MWD) disposé dans ledit train de tiges. Ce sous-ensemble d'espace isolant comprend des éléments secondaires supérieur (34) et inférieur (36) à interconnexion isolée. Un ensemble conducteur central (40) est disposé axialement dans l'ensemble secondaire inférieur sans pénétrer longitudinalement dans le sous-ensemble d'espace isolant. L'ensemble conducteur central sert à transmettre l'énergie électrique et des données au travers du sous-ensemble d'espace isolant entre les parties supérieures du train de tiges et les composants d'émetteur logés dans l'outil MWD au-dessous du sous-ensemble d'espace isolant.

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