Abstract
Unstable flow regimes occurring for multiphase flow in gas-lift wells have successfully been stabilized. using conventional linear control techniques. However, the control systems rely on downhole measurements which are at best unreliable, if at all available. In this paper, we employ a nonlinear observer for the states of the multi phase flow in the gas-lift well. The observer relies on topside measurements only, and downhole pressure for feedback control is estimated. Combining the non linear observer with conventional PI control of the downhole pressure, we demonstrate in laboratory experiments the potential for increasing production from gas-lift oil wells by stabilizing the multiphase flow.
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