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- W2029962511 abstract "Abstract Operators needing to cut single or concentric casings to facilitate well abandonment or for other purposes can use a slow-rotating hydroblast motor with a jet cutter head on drillpipe. This combination is capable of operating with tight clearances. This case history describes an operation wherein a jet cutter on a rotating motor was used to cut two components of a casing string, a 7-in. liner inside a 9 5/8-in. casing, at 400-ft depth. The well required abandonment, and the casing string was damaged, with a sharp bend that limited the tool size that could be used. Chemical cutting and mechanical cutting were considered, but the casing damage and size limitation it imposed caused the service company to recommend deployment of a slow-rotating motor and jet cutter head conveyed downhole on 2 7/8-in. drillpipe. The slurry pumped through the cutter was sand carried by seawater, gelled with a polymer. The 7-in. liner was cut first and removed from the well. The 9 5/8-in. casing was cut and removed to enable well abandonment procedures. The paper presentsdiscussion of the issues that led to use of the rotating motor setup,treatment plan, andexecution procedures. Introduction The customer experienced a wellhead failure caused by storm activities in the Gulf of Mexico. The 13 5/8-in., 54.5-lb casing had failed, falling inside itself until it rested on the 20-in. conductor pipe. This created a tight spot 23 ft deep and a hole in the 20-in. casing. The 20-in. conductor was split below the 13 3/8-in. casing head, exposing communication between the 13 3/8- and 20-in. pipes. The operator was unable to circulate up the 7-in. liner at either 3,000 or 1,600 ft. The operator was unable to pull any of the casing strings until the tree was straightened. However, due to high risk factors, the tree could not be straightened until the load of the 7- and 9 5/8-in. liner/casing was relieved. Field personnel were not confident in rigging up a power swivel to perform the cut due to the angle of the wellhead. Initially wireline was considered but was ruled out because of the unavailability of equipment. The operator approached the service company for solutions and it was determined that cutting using a slow-rotating tool while pumping a sand slurry would offer the best chance for success." @default.
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- W2029962511 date "2008-04-01" @default.
- W2029962511 modified "2023-09-27" @default.
- W2029962511 title "Cutting Concentric Casing Strings With Sand Slurry" @default.
- W2029962511 doi "https://doi.org/10.2118/113734-ms" @default.
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