| 摘要 |
Fluid flows in a downhole environment are controlled by regulating a ratio of the flows. The ratio of the flows is regulated such the ratio is constant and not sensitive to pressure and/or flow changes in the hydraulic system. The embodiment in system 30 below includes two cross-coupled hydraulic flow control subsystems, which regulate outlet flows 60 and 70 in response to an inlet flow 40. Flow sensors 54a, 54b are coupled to sense the flows 46, 42 and provide feedback to the flow controllers 50 in the opposite flow path. Positive feedback from this control method means that outlet flow 60 may be increased proportionately to an increase in outlet flow 70 to maintain the ratio of flows. |
