Patent ID: 11898429
Assignee: BJ ENERGY SOLUTIONS, LLC
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC E  F | IPC E  F

Claim 9:
10. A method for pumping a fracturing fluid into a wellhead, the method comprising:
controlling, via a fracturing unit controller, based at least in part on one or more of a target pressure, a target flow rate, an actual pressure, or an actual flow rate associated with the fracturing fluid pumped into the wellhead by a hydraulic fracturing pump, one or more of:
a first rotational speed associated with a compressor and a compressor turbine of a gas turbine engine, the compressor positioned to provide compressed air to a combustor section of the gas turbine engine, a second rotational speed associated with a power turbine of the gas turbine engine, the power turbine positioned such that heated combustion gas output from the combustor section causes the power turbine to rotate at the second rotational speed, or a third rotational speed associated with an output shaft of a transmission of the gas turbine engine, the output shaft connected to a hydraulic fracturing pump positioned to pump the fracturing fluid into the wellhead, and the transmission having an input shaft connected to the power turbine such that the input shaft rotates at the second rotational speed to drive the hydraulic fracturing pump; and
generating one or more brake control signals configured to at least partially control operation of a brake assembly of the gas turbine engine, the brake assembly configured to at least partially control the second rotational speed of the power turbine independent from the first rotational speed of the compressor turbine; and

receiving, via the fracturing unit controller, one or more starter signals indicative of starting the gas turbine engine; and
causing, based at least in part on the one or more starter signals, the compressor turbine to rotate at a target idle speed while the power turbine remains at zero rotational speed.