Method and composition for zonal isolation of a well
AssigneeSchlumberger Technology Corporation
InventorsLoïc Regnault de la Mothe, Sylvaine Le Roy-Delage
Life of this patent
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Abstract
The invention provides a system comprising: a tubular containing a first surface comprising a coating made of a first swellable material coating said first surface, wherein said coating has a second surface and said first swellable material is able to swell in contact with a first fluid on said second surface; and a composition made of a settable material and a second swellable material able to swell in contact with a second fluid. The invention also discloses the method associated with the use of such a system.
Claims18
A sealing system comprising:
- (i) a tubular having a first surface comprising a coating made of a first swellable material coating said first surface, wherein said coating forms a second surface, said first swellable material being able to swell in contact with a first fluid on said second surface;
- and
- (ii) a composition made of a settable material and a second swellable material able to swell in contact with said first fluid, with a second fluid, or both, wherein the second swellable material does not swell during the swelling of the first swellable material, and the second swellable material does not swell until after the settable material has set;
- characterized in that the second surface is coated by a protecting coating which is able to prevent or delay contact between the first swellable material and the first fluid.
A method to consolidate a subterranean formation in a well, comprising:
- lowering in the well, a tubular having a first surface comprising a coating made of a first swellable material coating said first surface, wherein the coating forms a second surface;
- and said first swellable material is able to swell in contact with a first fluid on said second surface;
- placing a settable material and a second swellable material able to swell in contact with said first fluid, a second fluid or both, wherein said settable material and said second swellable material are placed adjacent to the second surface;
- allowing the settable material to set;
- and
- allowing the first swellable material to swell in contact with the first fluid, wherein the second swellable material does not swell during the swelling of the first swellable material;
- and
- allowing the second swellable material to swell after the settable material has set.
Dependencies are inferred from the claim text.