System for pumping hydraulic fracturing fluid using electric pumps

  • US 8,789,601 B2
  • Filed: 02/26/2014
  • Issued: 07/29/2014
  • Est. Priority Date: 11/16/2012
  • Status: Active Grant
First Claim
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1. A system for hydraulically fracturing an underground formation in an oil or gas well to extract oil or gas from the formation, the oil or gas well having a wellbore that permits passage of fluid from the wellbore into the formation, the system comprising;

  • a plurality of pumps mounted on a trailer or truck and powered by electric motors and fluidly connected to the well, the pumps configured to pump fluid into the wellbore at high pressure so that the fluid passes from the wellbore into the formation, and fractures the formation;

    at least one variable frequency drive connected to the electric motors to control the speed of the motors, the at least one variable frequency drive frequently performing electric motor diagnostics to prevent damage to the electric motors if they become grounded or shorted; and

    a plurality of generators electrically connected to the plurality of pumps to provide electrical power to the pumps.

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