Method of treating a tubular string using a pigtrain

F - Mech Eng,Light,Heat,Weapons – 16 – L

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F16L 55/38 (2006.01) B08B 9/055 (2006.01)

Patent

CA 2753035

Embodiments of the present invention generally relate to a method of treating a tubular string using a pigtrain. In one embodiment, a method of treating a tubular string includes injecting working fluid between a lead pig and a trail pig of a pigtrain. A bypass pig of the pigtrain is in a first position between the lead pig and trail pig and closer to the lead pig. The method further includes injecting propellant behind the trail pig, thereby driving the pigtrain through the tubular string. The bypass pig gradually moves from the first position to a second position closer to the trail pig, thereby agitating the working fluid.

La présente invention porte de manière générale, dans certains modes de réalisation, sur un procédé de traitement d'un train de tiges à l'aide d'un train de racleurs. Dans un mode de réalisation, un procédé de traitement d'un train de tiges comprend l'injection d'un fluide de travail entre un racleur avant et un racleur arrière d'un train de racleurs. Un racleur de dérivation du train de racleurs se trouve dans une première position entre le racleur avant et le racleur arrière, et plus proche du racleur avant. Le procédé comprend en outre l'injection d'un agent propulseur derrière le racleur arrière, entraînant ainsi le train de racleurs à travers le train de tiges. Le racleur de dérivation se déplace progressivement de la première position à une seconde position plus proche du racleur arrière, agitant ainsi le fluide de travail.

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