Method and apparatus for controlling the manufacture of well...

Wells – Processes – With indicating – testing – measuring or locating

Reexamination Certificate

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C166S053000, C166S075150, C166S090100

Reexamination Certificate

active

07836949

ABSTRACT:
A method and apparatus for controlling the production of well treatment fluid is disclosed. The apparatus includes: a sand system, a water system, a pumping system, a blender tub, and a virtual rate control system. The method includes determining an output rate from a sand system; sensing an output rate from a water system; sensing an output rate from a pumping system; sensing the height within a blender tub of a mixture of sand from the sand system and water from the water system; providing a virtual rate control system; and producing a drive signal to the pumping system using the virtual rate control system using a desired rate of well treatment fluid to be delivered to a well, the output rate of the sand system, the output rate of the water system, and the output rate of the pumping system.

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