Patent ID: 9650879
Date: 2017-05-16
CPC Classifications: E21B,F04B,F04D

Claim:
1. A system for hydraulically fracturing an underground formation in an oil or gas well, the system comprising: a pump for pumping hydraulic fracturing fluid into the wellbore at high pressure so that the fluid passes from the wellbore into the formation and fractures the formation, the pump having a pump shaft that turns to activate the pump; an electric motor with a motor shaft to drive the pump, the electric motor including a variable frequency drive and an alternating current console to control the speed of the electric motor to protect against overheating; and a torsional coupling connecting the motor shaft to the pump shaft, the torsional coupling comprising: a motor component fixedly attached to the motor shaft of the electric motor; and a pump component fixedly attached to the pump shaft of the pump; the motor component engaged with the pump component so that when the motor shaft and motor component rotate, the motor component contacts the pump component so that the pump component and the pump shaft rotate, thereby driving the pump.