Method of removing wellhead assemblies

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 29/12 (2006.01) E21B 33/035 (2006.01)

Patent

CA 2247812

The invention provides a method of cutting a well casing located beneath a subsea wellhead (1), the method comprising the steps of: running a cutting tool through the wellhead (1) into the casing; securing the position of a motor (7) relative to the wellhead (1) so as to transmit rotary reaction forces from the motor (7) to the wellhead (1) or a fixture secured relative to the wellhead; and operating the motor (7) so as to rotate the cutting tool and thereby effect cutting of the casing. The invention overcomes the problems associated with prior art techniques of requiring the use of explosive charges or a drilling rig located above the wellhead.

L'invention se rapporte à un procédé de découpe d'un tubage de puits placé sous une tête de puits sous-marine (1). Ce procédé comprend les étapes consistant à faire descendre par la tête de puits (1) un outil de découpe dans le tubage; à positionner un moteur (7) par rapport à la tête de puits (1) de façon à ce que le moteur (7) transmette des forces réactionnelles rotatives à la tête de puits (1), ou à fixer un dispositif de serrage par rapport à la tête de puits; et mettre en route le moteur (7) de façon à faire tourner l'outil de découpe et à ainsi effectuer la découpe du tubage. Cette invention résout les problèmes associés aux techniques antérieures qui nécessitaient d'utiliser des charges explosives ou un appareil de forage placé au-dessus de la tête de puits.

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