| CPC E21B 43/10 (2013.01) [E21B 23/001 (2020.05)] | 13 Claims |
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8. A method of operating a well system, the well system comprising a wellbore drilled into a subterranean zone, the method comprising:
attaching a tractor assembly to a casing string between a float collar and a casing shoe of the casing string, the tractor assembly comprising:
a tubular main body having a central axis parallel with an axis of the casing string;
a fluid flow passage within the main body configured to permit a flow of fluid flowing from casing string through the tractor assembly;
a turbine disposed in the flow passage and configured to be rotated by a flow of fluid from the casing string through the fluid flow passage;
an alternator disposed in the main body and configured to convert the rotation of the turbine into electricity;
one or more wheels extending radially at least partially from an exterior surface of the main body; and
one or more electric motors configured to, when actuated by electricity from the alternator, drive rotation of the one or more wheels;
disposing the casing string in the wellbore; and
in response to encountering an obstruction or restriction limiting movement of the tubular string in the wellbore, flowing a fluid through the casing string and thence through the flow passage, thereby rotating the turbine and rotating the one or more wheels.
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