Modular remote power generation and transmission for hydraulic fracturing system
A hydraulic fracturing system for fracturing a subterranean formation includes a power generation system, a transmission section, and an equipment load section. The power generation system includes a turbine generator that generates electricity that is used to power equipment in the equipment load section. The equipment in the equipment load section conditions and pressurizes fluid that is injected into a wellbore for fracturing the formation. The power generation and equipment load sections are distal from one another are separated by a long distance. The transmission section connects the power generation and equipment load sections, and thus spans the long distance between these sections.
1. A hydraulic fracturing system for fracturing a subterranean formation comprising:
an electric motor;
a pump coupled to the motor, and that has a discharge in fluid communication with a wellbore that intersects the formation, so that when the motor is activated and drives the pump, pressurized fluid from the pump pressurizes the wellbore to fracture the formation;
a variable frequency drive in communication with the electric motor, and that controls the speed of the motor, and performs electric motor diagnostics to prevent damage to the electric motor;
a source of electricity that is disposed a long distance from the electric motor
transmission lines that connect the source of electricity to the electric motor and that span the long distance between the source of electricity and the electric motor; and
a switch gear between the transmission line and the source of electricity, and another switch gear between the transmission line and the electric motor.
2. The hydraulic fracturing system of claim 1 , further comprising a transformer between the transmission line and the source of electricity.
3. The hydraulic fracturing system of claim 1 , further comprising a transformer between the transmission line and the electric motor.
4. The hydraulic fracturing system of claim 1 , wherein the source of electricity is selected from the group consisting of a utility outlet, a turbine generator, and a reciprocating engine generator.
5. The hydraulic fracturing system of claim 4 , further comprising an electric equipment room in communication with the turbine generator and which controls operation of the turbine generator.
6. The hydraulic fracturing system of claim 1 , further comprising a transformer between the switch gear and the electric motor.
7. The hydraulic fracturing system of claim 1 , wherein the electric motor comprises a first electric motor, the system further comprising a multiplicity of electric motors, and wherein the transmission lines are selectively moveable at different times to provide electrical communication between the source of electricity and the multiplicity of motors.
8. A method of fracturing a subterranean formation comprising:
driving a pump with an electric motor;
transmitting electricity via a transmission line to the electric motor from a power source that is a long distance from the electric motor, wherein a first switchgear is positioned between the power source and the transmission line and a second switchgear is positioned between the transmission line and the electric motor;
pressurizing a fluid with the pump to form a pressurized fluid; and
fracturing the subterranean formation by directing the pressurized fluid to a wellbore that intersects the subterranean formation.
9. The method of claim 8 , further comprising controlling a speed of the motor with a variable frequency drive.
10. The method of claim 9 , further comprising performing diagnostics on the electric motor with the variable frequency drive.
11. The method of claim 8 , further comprising increasing a voltage of the electricity proximate the power source with a transformer, and decreasing the voltage of the electricity proximate the electric motor.
12. The method of claim 8 , further comprising suspending electrical communication between the power source and the electric motor with one of a cutout or a switch gear.
13. The method of claim 8 , wherein the electric motor comprises a first electric motor, the pump comprises a first pump, the wellbore comprises a first wellbore, and the subterranean formation comprises a first subterranean formation, and wherein the step of transmitting electricity to the electric motor comprises transmitting electricity across a transmission section that has an end in electrical communication with the power source, and another end that is in electrical communication with the first electric motor, the method further comprising,
disconnecting the end of the transmission section that is in communication with the first electric motor and reconnecting that end to a second electric motor is a long distance from the power supply and that is connected to a second pump, and
pressurizing fluid with the second pump and directing the pressurized fluid to a second wellbore for fracturing a second subterranean formation.
14. The method of claim 8 , wherein the power source comprises a power generation section that includes devices selected from the group consisting of a utility outlet, a turbine generator, and an electrical equipment room.