Method and apparatus for sealing a casing within a borehole

A method of sealing a casing 6 within a borehole 5 includes performing an initial sealing operation in which a first sealant 8A is provided to an annulus 7 between a wall of the casing 6 and a wall of the borehole 5, to fill a volume of the annulus. A top-up operation is also performed in which a se...

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Bibliographische Detailangaben
1. Verfasser: Halvor Kjorholt
Format: Patent
Sprache:eng
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Beschreibung
Zusammenfassung:A method of sealing a casing 6 within a borehole 5 includes performing an initial sealing operation in which a first sealant 8A is provided to an annulus 7 between a wall of the casing 6 and a wall of the borehole 5, to fill a volume of the annulus. A top-up operation is also performed in which a second sealant 28 is provided along an axial length of at least a portion of the volume of the annulus filled by the volume of first sealant. The provision of the second sealant to the annulus serves to top-up the seal provided in the annulus by first sealant such that any cracks or gaps therein are filled. The method is carried out by an apparatus 9 receivable within the casing 6. The apparatus has an opening 16 to permit the first sealant to enter the annulus, and a means 22 for distributing the volume of second sealant. The sealants could include cement, and the second sealant could have a mixture of hardener and resin. Top plugs could be used to prevent further fluid flow after the sealing operations.