Automated precise constant pressure fracturing with electric pumps

A method of controlling a pumping sequence of a fracturing fleet at a wellsite, comprising:

• receiving, by a global control process executing on a computer system, an operating setpoint for a current stage of a designed pumping procedure, wherein the operating setpoint comprises a target pressure, and wherein the designed pumping procedure comprises a plurality of sequential pumping stages;
• directing, by the global control process, a pumping operation of a plurality of pump units comprising at least two electric frac pumps by transmitting a first unit setpoint to each of the pump units, wherein the first unit setpoint is the operating setpoint, and wherein the plurality of pump units are communicatively connected to the computer system;
• determining a wellbore pressure change;
• and
• maintaining, by the global control process, the target pressure of the pumping operating by communicating a second unit setpoint to at least one electric frac pump in response to the wellbore pressure change.

A fracturing fleet system at a wellsite, comprising:

• a blender fluidically connected to a manifold;
• a plurality of pumping units comprising at least two electric frac pumps fluidically connected to the manifold;
• a wellhead connector fluidically connected to the manifold;
• an global control process, executing on a computer system, controlling a pumping operation of the fracturing fleet;
• wherein the global control process is configured to perform the following:
• loading an operating setpoint for an interval of a designed pumping procedure, wherein the operating setpoint comprises a target pressure value, and wherein the designed pumping procedure comprises a plurality of sequential pumping stages;
• determining a first unit setpoint and a second unit setpoint, wherein the first unit setpoint is equal to the target pressure value, wherein the second unit setpoint is i) equal to, ii) less than, or iii) greater than the first unit setpoint in response to a probability value indicating that a wellbore pressure is i) equal to, ii) greater than, or iii) less than the target pressure;
• and
• communicating the second unit setpoint to a first electric frac unit and a first unit setpoint to the remaining electric frac units;
• and
• pumping a fracturing treatment into the wellhead connector at the target pressure in response to the first electric frac unit delivering the fracturing treatment at a pressure value i) equal to the target pressure, ii) less than the target pressure, or iii) greater than the target pressure.