Method for providing a permanent barrier in a well
AssigneeInterwell P&A AS
InventorsTorgeir Rusten, Stian Tøndel
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Abstract
A method for providing a permanent barrier in a well includes lowering a first, particulate constituent of a pyrotechnic mixture to a desired location in the well, wherein the first constituent is a metal oxide. The method further includes waiting a first predetermined period of time to allow the first, particulate constituent to settle as sediment at the desired location, lowering a second constituent of the pyrotechnic mixture to the desired location in the well, wherein the second constituent is a metal, and igniting the pyrotechnic mixture to start a heat generating exothermic reduction-oxidation process.
Claims15
A method of constructing a well, the method comprising:
- lowering a first casing radially inside a formation wall of the well or radially inside of a second casing within the well, thereby forming an annulus radially outside of the first casing;
- and thereafter
- positioning a first constituent of a pyrotechnic mixture in the annulus, wherein the first constituent is a metal oxide;
- and thereafter
- solidifying the first constituent in the annulus, thereby providing zonal isolation between the first casing and the formation wall or between the first casing and the second casing,
- wherein the solidifying of the first constituent comprises sintering the first constituent, wherein sintering is defined as a process of compacting and forming a solid mass of material by heat or pressure without melting the solid mass of material to the point of liquefaction.
A method of constructing a well, the method comprising:
- lowering a first casing radially inside a formation wall of the well or radially inside of a second casing within the well, thereby forming an annulus radially outside of the first casing;
- and thereafter
- positioning a first constituent of a pyrotechnic mixture in the annulus, wherein the first constituent is a metal oxide;
- and thereafter
- solidifying the first constituent in the annulus, thereby providing zonal isolation between the first casing and the formation wall or between the first casing and the second casing,
- wherein the first constituent is a particulate metal oxide, and
- wherein the solidifying of the first constituent comprises one of:
- sintering the first constituent, wherein sintering is defined as a process of compacting and forming a solid mass of material by heat or pressure without melting the solid mass of material to the point of liquefaction;
- and
- waiting a predetermined period of time for the first constituent to settle as sediment within the annulus.
A method comprising:
- constructing a well by
- lowering a first casing radially inside a formation wall of the well or radially inside of a second casing within the well, thereby forming an annulus radially outside of the first casing, and thereafter
- positioning a first constituent of a pyrotechnic mixture in the annulus, wherein the first constituent is a metal oxide, and thereafter
- solidifying the first constituent in the annulus, thereby providing zonal isolation between the first casing and the formation wall or between the first casing and the second casing;
- and
- permanently abandoning the well by
- lowering a second constituent of the pyrotechnic mixture to an area of the solidified first constituent, wherein the second constituent is a metal, and
- igniting the pyrotechnic mixture to start a heat generating exothermic reduction-oxidation process.
Dependencies are inferred from the claim text.