| CPC E21B 43/2607 (2020.05) [E21B 43/26 (2013.01); F04B 23/04 (2013.01); F04B 49/20 (2013.01); F04B 2201/1203 (2013.01)] | 20 Claims |

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20. A pump unit, comprising:
a dual-shaft gas turbine engine mounted to a reduction gearbox;
a driveshaft operably connected to the reduction gearbox; and
a reciprocating positive displacement pump operably connected to the driveshaft,
wherein the reduction gearbox and the reciprocating positive displacement pump are mounted to a trailer and the dual-shaft gas turbine, the reduction gearbox, the driveshaft, and the reciprocating positive displacement pump are disposed sequentially along the length of the trailer, and
wherein the dual-shaft gas turbine engine is configured to be over-fired to produce an output power in a selected range of 101% of a maximum continuous power (MCP) level of the pump unit to a maximum intermittent power (MIP) level of the pump unit.
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