Produção de petroleo por elevação a gas intermitente : simulação e analise dos metodos convencional e invertido / Petroleum production by intermittent gas lift: simulation and analysis of conventional and inverted methods

AUTOR(ES)
DATA DE PUBLICAÇÃO

2004

RESUMO

The intermittent gas lift is used in the oil industry to keep up a viable production from depleting reservoirs or low productivity wells. The cyclical pattern of the intermittent gas lift causes the dynamic behavior of the well to become complex, making it difficult to design and operate of such systems. Amongst the existing versions, the conventional (IGL) and the inverted (I-IGL) methods - the last one not covered in literature - are taken as objects of study. Evolving from the preexisting models, in which the gas lift cycles are treated as a sequence of self-contained stages, the behavior of the well, in the present work, takes into account the occurrence of simultaneous and coupled stages throughout the cycles. The interactions of the well and its connections with the reservoir and the surface, e.g., liquid and gas flows, are represented by a complete set of non-linear algebraic and time dependent ordinary differential equations, valid for alI the stages of the cycle. The dynamic simulation of the system is carried out with the numerical solution of the equation subsets of the model, interactively established for each stage, at each time step. The results of the simulations of the IGL were compared with experimental measurements carried through by other authors, presenting good agreement. The analysis of the IGL and I-IGL cycles under various operational conditions made it possible to delineate ranges of steady cycles and production. The production economic profit was evaluated for both versions, detennining the best compromise between the well cycling and its operational performance at each cycle. The developed modeling and the simulation algorithm can be extended to other gas lift versions, constituting a unique tool of great value for the engineers involved with these systems

ASSUNTO(S)

poços de petroleo - gas-lift petroleo petroleum gas lift gas gas oil wells

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