Mobile fracking pump trailer

1. A mobile fracking pump trailer comprising:

a gas turbine engine operable at a desired engine speed,

an engine output shaft coupled to the gas turbine engine for rotation at a desired engine shaft output speed;

a fracking pump configured for pumping a fracking slurry down a wellbore, the fracking pump comprising a fracking pump input shaft operable at a desired pump input speed;

a torque converter assembly comprising a torque converter that fluidly couples the engine output shaft and the fracking pump input shaft, the torque converter operable at a desired torque converter input speed and providing a variable torque converter output speed for delivering power to the fracking pump at the desired pump input speed according to its pumping load without requiring shifting of gears;

a first reduction gearing, connected between the engine output shaft and a torque converter input shaft for reducing the desired engine shaft output speed to the desired torque converter input speed transmitted to the torque converter,

a first power takeoff connected to the first reduction gearing,

an electrical system for distributing electrical power to the mobile fracking pump trailer,

an electrical machine connected to the first power takeoff for selectively driving the engine output shaft through the first reduction gearing when energized by an offboard electrical power source to start the gas turbine engine in a starting mode, and for extracting power from the engine output shaft through the first reduction gearing for generating electricity provided to the electrical system in a generating mode when the gas turbine engine is running, whereby the electrical system is powered by the electrical machine after starting of the gas turbine engine by a offboard electrical power source, and

the gas turbine engine, the torque converter assembly, the fracking pump, the first reduction gearing, the first power takeoff, the electrical system, and the electrical machine being configured to fit in an operating arrangement on a single platform so that the mobile fracking pump trailer can be transported on roads as one unit.

2. The mobile fracking pump trailer of claim 1 , further comprising a second reduction gearing disposed between the torque converter output shaft and the fracking pump input shaft for reducing the desired pump input speed transmitted to the fracking pump.

3. The mobile fracking pump trailer of claim 1 , wherein fracking pump is a reciprocating pump.

4. The mobile fracking pump trailer of claim 1 , further comprising a second power takeoff for driving an oil pump to pump oil in an oil circulation circuit to at least one of the fracking pumps, the gas turbine engine, and the torque converter assembly.

5. The mobile fracking pump trailer of claim 4 , the oil circulation circuit further comprising an oil cooler mounted on an upper portion of the single platform away from the fracking pump, the gas turbine engine, and the torque converter assembly.

6. The mobile fracking pump trailer of claim 5 , wherein the electrical machine is configured for providing electrical power to the oil cooler in a generating mode.

7. The mobile fracking pump trailer of claim 5 , the oil circulation circuit further comprising an oil reservoir.

8. The mobile fracking pump trailer of claim 7 , wherein the oil reservoir is attached to an underside of the single platform.

9. The mobile fracking pump trailer of claim 2 , further comprising a third reduction gearing disposed between the second reduction gearing and the fracking pump input shaft for further reducing the desired pump input speed transmitted to the fracking pump.

10. A method of operating a mobile fracking pump trailer comprising:

on a single platform that can be transported on roads as one unit:

mounting, in an operating arrangement, a gas turbine engine operable at a desired engine speed and comprising an engine output shaft coupled to the gas turbine engine for rotation at a desired engine shaft output speed to a fracking pump configured for pumping a fracking slurry down a wellbore, the fracking pump comprising a fracking pump input shaft operable at a desired pump input speed via a torque converter assembly comprising a torque converter that fluidly couples the engine output shaft and the fracking pump input shaft, the torque converter operable at a desired torque converter input speed and providing a variable torque converter output speed for delivering a desired power to the fracking pump at the desired pump input speed according to its pumping load without requiring shifting of gears;

mounting a first reduction gearing, connected between the engine output shaft and a torque converter input shaft for reducing the desired engine shaft output speed to the desired torque converter input speed transmitted to the torque converter,

connecting a first power takeoff to the first reduction gearing;

connecting an electrical machine to the first power takeoff;

selectively driving the engine output shaft through the first reduction gearing by remotely energizing the electrical machine from an offboard electrical power source to start the gas turbine engine in a starting mode; and

extracting power from the engine output shaft through the first reduction gearing and generating electricity delivered to the electrical system in a generating mode when the gas turbine engine is running.

11. The method of claim 10 , further comprising powering the electrical system by the electrical machine after starting of the gas turbine engine for distributing electrical power to the mobile fracking pump trailer.