| 摘要 |
The chemical injection system (10) is provided for controlling the distribution of chemical fluid from a supply conduit (12) into an individual petroleum well at an adjustable rate. The system includes a remotely operated two position control valve (14) connected to the supply conduit, and cylinder (30) having a cylinder bore (31) with first input-output port (34), and a second input-output port (36). The fluid barrier (50, 150, 250, 251) is provided within the cylinder bore, such that chemical fluid flows from the supply conduit through the control valve to one end of the cylinder bore and forces the barrier to displace a fixed volume of fluid. Each operation of the directional control valve reverses travel direction of the barrier within the cylinder bore and injects another fixed quantity of fluid into the well.
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