| 摘要 |
<p>A method and apparatus for controlling the production of well treatment fluid is disclosed. The apparatus includes: a sand system (106), a water system (202), a pumping system (112), a blender tub (105), 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.</p> |
