Highly oscillatory flow regimes that can occur in gas-lift oil wells have been successfully treated using conventional linear control. However, these control systems rely on downhole pressure measurements which are unreliable or even unavailable in some cases. In this paper we propose a solution based on a high gain observer for the state of the process. The estimates are used to compute the do...

Oil wells with an oscillating production rate have a lower production compared to oil wells producing at a constant rate. This study looks at instability caused by the casing-heading phenomenon. Control is applied to achieve stable production rate. Two realistic gas lifted systems for oil and gas production are investigated, using the multiphase flow simulator OLGA2000. Different control struct...

A multi-objective optimization (MOO) of two-element wing models with morphing flap by using computational fluid dynamics (CFD) techniques, artificial neural networks (ANN), and non-dominated sorting genetic algorithms (NSGA II), is performed in this paper. At first, the domain is solved numerically in various two-element wing models with morphing flap using CFD techniques and lift (L) and drag ...

Diesel and biodiesel spray combustion in a high temperature and high pressure environment was investigated in a constant volume combustion chamber. The effects of ambient gas temperature and ambient oxygen concentration on the combustion process were studied. The ambient temperatures varied from 800 K to 1200K, while the ambient oxygen concentrations varied from 21% to 9%. The results indicate ...

An Intelligent Supervision Scheme for the Industrial Production is presented in this work. Such scheme is tested for gas lift (GL) oil wells. The proposal is based on the possible production assessment, the process variables (specifically, the bottom-well pressures), and the operational scenarios detection for the process (in the case of study, as an oil producing well), with the objective of o...

In tall buildings where there is heaving traffic, the service offered by multi-car lift systems is qualitatively sufficent. Besides, the lifts are expected to work fast, efficiently and without waiting and not affecting the activities of the building negatively. It has become possible to apply computer-based group control systems for the liftts to function with high performance quantitatively. ...

— Gas-lifted wells often present unstable behaviors that cannot be described by hydrostatic laws. In this thesis, we aim at analyzing the well dynamics, especially when its production is irregular. We end up by designing control solutions. We begin with a brief description of the gas-lift activation technique. The negative impact of instabilities on oil production is underlined. Two main mechan...

In this paper multi-objective genetic algorithms were employed for Pareto approach optimization of turboprop engines. The considered objective functions are used to maximize the specific thrust, propulsive efficiency, thermal efficiency, propeller efficiency and minimize the thrust specific fuel consumption. These objectives are usually conflicting with each other. The design variables consist ...

This paper presents investigations of two special cases of dynamic valve analysis. These special cases arose in the development of a new type of gas field reciprocating compressor. These special cases were for a moving frame of reference (since the discharge valves were integral with the piston) , and for independent mass damping {sealing/damping elements are modelled separately instead of as "...

In this report, we address aerodynamic shape optimization problems including uncertain operating conditions. After a review of robust control theory and the possible approaches to take into uncertainty, we propose to use Taguchi robust design methods in order to overcome single point design problems in Aerodynamics. The latter techniques produce solutions that perform well for the selected desi...