To improve pressure control accuracy in managed-pressure-drilling for deep and ultra-deep wells, this paper proposes a linear design method for multiple-type throttle valves based on variable-diameter profile optimization. A dynamic mapping relationship between valve core stroke and throttling area was established, incorporating the viscous-fluid total-flow Bernoulli equation, Leibniz theorem, and kinetic energy and area correction mechanisms. Using this approach, the profiles of cylindrical and wedge-shaped valve cores were optimized. Experimental results demonstrate that the linear correlation coefficients of pressure drop for the cylindrical valve and wedge-shaped valve reach 0.9932 and 0.9919, respectively, within the 0-100% effective stroke range. These findings confirm that the proposed method enables fullstroke linear pressure control of throttle valves.
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