| CPC E21B 31/18 (2013.01) [E21B 17/042 (2013.01)] | 13 Claims |
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1. An overshot for removing a fish from a wellbore, the overshot comprising:
a first catch configured to attach to a fishing assembly, the first catch comprising:
a threaded connection disposed at a first end of the first catch, configured to attach to the fishing assembly; and
an opening disposed at a second end of the first catch, configured to swallow the fish;
one or more additional catches configured to be connected, in sequence, to the first catch, each of the one or more additional catches comprising:
a bottom opening disposed at a bottom end of each of the one or more additional catches, configured to swallow the fish and connect to an additional catch; and
a top protrusion disposed at a top end of each of the one or more additional catches, configured to connect to the opening of the first catch or to the bottom opening of an additional catch;
wherein each catch of the one or more additional catches comprises a different internal diameter from other catches of the one or more additional catches;
wherein the one or more additional catches are configured to be connected, in order, according to their respective internal diameters;
wherein the bottom opening of each of the one or more additional catches comprises a lower threaded connection configured to be threaded together with a complementary upper threaded connection of the top protrusion of an additional catch;
wherein the lower threaded connection is disposed on an interior of the one or more additional catches and the complementary upper threaded connection is disposed on an exterior of the top protrusion of the one or more additional catches; and
wherein the overshot is configured to attach to a top of the fish.
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