Modelling and control of two-phase systems

Lewin, Daniel R.; Faigon, Miriam; Fuchs, Avraham; Semiat, Raphael

doi:10.1016/s0098-1354(09)80017-3

Cited by 6 publications

(2 citation statements)

References 3 publications

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“…Inverse responses are commonly observed for two-phase flow systems. [61] Concerning systems with inverse response, control methods can be grouped into two types of control structures: re-verse response compensators and Proportional Integral Derivative (PID) controllers with adaptive tunings. [62] The category employing inverse response compensators, which generally uses the Smith's predictor concept, also known as time delay compensators, aims to remove the Right Half Plane (RHP) zero of the feedback loop.…”

Section: Introductionmentioning

confidence: 99%

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Transient Open‐Closed Loop Experimental Validation of a Nonlinear Two‐Phase Flow Distributed System

Vega

Carvalho

Oliveira

et al. 2023

Macro Reaction Engineering

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The oil well drilling process is a nonlinear system with transient nature. Conventional drilling is unable to assure safe and cost‐effective operation for fractured, cavernous, and highly permeable carbonate reservoirs, which contain the largest oil reserves worldwide. Concerning drilling technologies, Pressurized Mud Cap Drilling (PMCD) is suitable for the challenging scenario previously mentioned. According to PMCD technique, a sacrificial fluid is injected through the drill string and a light annular mud is pumped in countercurrent through the annulus region (bullheading), without surface return, forcing gas and drilled cuttings back to formation. A two‐phase flow distributed model (Drift Flux Model – DFM) is developed to properly describe the complex nature of the system. Also, an experimental facility, presenting field similarity, is employed to validate the open – closed loop schemes. The main objective of the controller (control reconfiguration with gain scheduling) is to regulate annulus pressure, handling gas kick, drilling fluid losses and inverse response dynamics. Besides, gas injection, migration and bullheading are studied. The simulations, validated through experimental data, highlight the methodology usefulness for field applications.

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Section: Introductionmentioning

confidence: 99%

“…Inverse responses are commonly observed for two‐phase flow systems. [ 61 ] Concerning systems with inverse response, control methods can be grouped into two types of control structures: reverse response compensators and Proportional Integral Derivative (PID) controllers with adaptive tunings. [ 62 ]…”

Section: Introductionmentioning

confidence: 99%