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AssigneeBiSN Tec Ltd
InventorsPaul Carragher, Jake Dearmon, Didhiti Talapatra
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A single trip method of repairing a leaking annular seal located within an annulus that encircles an oil/as wellbore tubular body, examples of such seals including annular packers or cement seals. The method comprises providing deflector within a wellbore tubular body adjacent to one or more openings in the wall of the tubular body. Alloy beads are then deployed downhole via the tubular body so that the alloy beads are deflected via said openings into the annulus where they accumulate on top of the annular seal. The alloy is then heated to form an alloy plug above the annular seal. The present invention also provides an annular seal repair tool assembly for use in the repair method of the present invention.
A method of repairing a leaking annular seal located within an annulus that encircles an oil/gas wellbore tubular body, said method comprising:
The method of any one of the preceding claims, further comprising forming one or more openings in the portion of the tubular body wall that is located up-hole from the annular seal, wherein said one or more openings are formed prior to the delivery of the alloy beads using a hole making tool that forms part of the annular seal repair tool assembly.
The method of any one of the preceding claims, wherein the downhole target region is agitated in order to assist the passage of the alloy beads through said one or more openings into the annulus.
The method of any one of the preceding claims, wherein the deflector comprises insulating means configured to restrict the passage of conducted heat through the deflector.
The method of any one of the preceding claims, wherein the deflector is deployed downhole in an unexpanded or partially expanded state and then expanded towards the tubular body wall in the downhole target region so as to increase the extent to which the deflector redirects the alloy beads.
The method of any one of the preceding claims, wherein the heating tool comprises one or more chemical reaction heaters.
The method of any one of the preceding claims, wherein the alloy beads are provided in the form of a low melting alloy that has melting point of less than 300° C.
The method of any one of the preceding claims, wherein the alloy beads are provided in the form of a bismuth based alloy.
A downhole annular seal repair tool assembly for use in forming an alloy plug on an existing annular seal that substantially encircles an oil/gas wellbore tubular body, said assembly comprising:
Dependencies are inferred from the claim text.