E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 33/06 (2006.01) E21B 33/068 (2006.01)
Patent
CA 2590984
The invention provides an apparatus (1) and a method of substantially sealing a throughbore (3) of a tubular (2). The tubular (2) has a line (88) running therethrough. The method comprises the steps of: (a) substantially enclosing the line (88) and sealing a portion of the throughbore (3) around the line (88) using an enclosing means (58, 59); (b) injecting a fluid in the region of the line (88), wherein the fluid contains solid particles; and (c) substantially sealing a remaining portion of the throughbore (3) using the solid particles such that the sealed throughbore (3) is capable of withstanding a pressure differential. The method can include settling out the solid particles from the fluid in response to a drop in pressure of the fluid during step (b). The method can include injecting a first fluid in the region of the line (88) prior to step (b). The method can further include substantially sealing the remaining portion of the throughbore (3) according to step (c) using the first fluid and the solid particles. The first fluid can be a heavy hydrocarbon such as a grease and the fluid containing solid particles can be a drilling fluid.
L'invention concerne un appareil (1) et une méthode permettant d'obturer en quasi-totalité l'alésage (3) d'une structure tubulaire (2). La structure tubulaire (2) est pourvue d'une canalisation (88) traversant l'alésage. La méthode comprend les étapes suivantes : a) l'encloisonnement quasi-total de la canalisation (88) et l'obturation d'une partie de l'alésage (3), tout autour de la canalisation (88), avec des moyens enveloppants (58, 59); b) l'injection d'un fluide contenant des particules solides dans la zone de la canalisation (88); et c) l'obturation quasi-totale du reste de l'alésage (3) à l'aide de particules solides afin que l'alésage obturé (3) puisse résister à une pression différentielle. La méthode peut inclure la décantation du fluide lorsque sa pression chute au cours de l'étape (b). La méthode peut prévoir l'injection d'un premier fluide dans la zone de la canalisation (88) avant l'étape (b). La méthode peut également inclure l'obturation quasi-totale du reste de l'alésage (3), conformément à l'étape (c), en utilisant le premier fluide et les particules solides. Le premier fluide peut être un hydrocarbure lourd, tel qu'une graisse, et le fluide contenant les particules solides peut être un fluide de forage.
Elmar Services Limited
Emery Jamieson Llp
National Oilwell Varco Uk Limited
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