Isolation device of part of a well

摘要

The invention relates to isolation of part of a well, which comprises pipe provided, along its external face, with a first external sleeve, wherein the opposite ends are connected directly or indirectly to said external face of the pipe. The pipe, first external sleeve and its ends together delimit an annular space, the wall of said pipe exhibiting at least one opening which allows it to communicate with said space, this sleeve being likely to expand and to be applied tightly against the well over an intermediate part of its length. The device also comprises on the one hand, a second internal sleeve, which extends between said pipe and the first sleeve, its ends being also connected directly or indirectly to the external face of said pipe and, on the other hand, at least one communication passage between the exterior of the first sleeve and said space.

主权项

1. An isolation device of part of a well which comprises pipe provided along its external face with at least one metallic tubular sleeve, which forms a first external sleeve, wherein opposite end portions of the first external sleeve are connected directly or indirectly to said external face of the pipe, the pipe, the first external sleeve and the first external sleeve's end portions jointly delimiting a first space therebetween, a wall of said pipe exhibiting a first opening which allows it to communicate with said first space, the first external sleeve being configured for expansion and application tightly against the well over an intermediate part of a length of the first external sleeve,
wherein the isolation device comprises:
a second expandable internal sleeve, which extends between said pipe and the first sleeve, wherein end portions of the second sleeve are connected directly or indirectly to the external face of said pipe, while being sandwiched between the end portions of the first sleeve and the external face of the pipe,a second opening communicating with the exterior of the first sleeve and a second space located between the first and second sleeves,said first and second spaces being free of solid or sealant material, or of a liquid or paste which is configured to solidify,said first opening communicating with a third space located between said pipe and said second internal sleeve.