METHOD TO CURE LOST CIRCULATION.

摘要

The invention provides a method to cure lost circulation in a zone (5) of a wellbore (1), comprising the steps of: placing a first pipe (10) in the wellbore; placing a second pipe (20) inside said first pipe and creating an annular (2); wherein said first pipe and said second pipe are arranged such that the end of the second pipe (21) is located in the vicinity of the zone (5); pumping a first material (12) via the annular of the first pipe; pumping a second material (22) via the second pipe, wherein said first material and said second material create a solid foam (52) when in contact; and creating said solid foam in the vicinity of the zone such that the lost circulation be cured.