Eduardo Gaspari

• Petróleo Brasileiro S.A.

This study presents a transient multiphase flow simulator based on the non-isothermal Drift-Flux model that aims to reproduce oil and gas production systems. The mathematical model consists of three mass conservation equations, one equation for the momentum mixture and one equation to reproduce the energy conservation of the gas-liquid-liquid mixtu...

The present study proposes a transient simulator able to reproduce important phenomena inherent to petroleum production systems based on the non-isothermal Drift-Flux model. The system of equations considers a three phase flow regardless the liquid-liquid drift velocity, assuming mass transfer among the phases and heat transfer counter-currently be...

The present work compares different methodologies and experimental data in transient isothermal gas-liquid slug flows into a horizontal pipeline. Four cases are addressed: The expansion and compression of a gas-liquid mixture due to the variation of the inlet gas superficial velocity assuming the inlet liquid superficial velocity constant and varyi...

The problem of cuttings transport in the inclined sections of extended reach wells (ERW) is a major concern in the oil-well drilling industry. This article presents an innovative time-dependent mathematical model, along with a computer implementation of it, which is based on the well-known two-layer model approach. An innovative feature of this mod...

Gas hydrate formation during deep water offshore drilling is a well known operational hazard. Drill stem testing of gas reservoirs in deep water poses an even more hazardous potential since thermodynamic inhibition is sometimes ineffective because the well can produce more water than expected. This paper describes the formation and dissociation of...

The knowledge of the slug flow characteristics is very important when designing pipelines and process equipment. When the intermittences typical in slug flow occurs, the fluctuations of the flow variables bring additional concern to the designer. Focusing on this subject the present work discloses the experimental data on slug flow characteristics...

The problem of cuttings transport in the inclined sections of ERW's is a major concern in the oilwell drilling industry. This paper presents a field on the possibility of keeping drilling in the presence of a controlled instability process. The study is supported by an innovative time dependent mathematical model, along with a computer implementati...

A good theory of stability is essential to the prediction of flow pattern transition; therefore, it is crucial to the design of two-phase flow systems, since the behavior and performance of such systems (flow rate versus driving head) is inherently dependent on the actual pattern that occurs in the flow (bubbles, slugs, annular, stratified etc.). T...