Development of a novel compositional simulation approach to model recovery from volatile oil reservoirs

Syahrial, Ego; Daltaban, T S

doi:10.29118/ipa.1040.247

Cited by 3 publications

(3 citation statements)

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“…Figures 3 and 4 present the production well performance after 1050 days of gas injection. Unlike homogeneous anisotropic and horizontal models discussed in the previous publication (Syahrial, 1997), there is a substantial recovery drop in the stratified case. This is due to the presence of higher permeability layers at the top of the reservoir which dominate the gas flow and cause early gas breakthrough, and stabilised gas profile distribution.…”

Section: A Effect Of Decreasing Permeability With Depth On Gravity Se...contrasting

confidence: 56%

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Modeling Gravity Segregation In Stratified And Dipping Reservoir Of Volatile Oil

Syahrial¹

2022

SCOG

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In this paper, we investigate gravity segregation in stratified and dipping reservoir of volatile oil under gas injection. A new efficient compositional simulation approach was used in this study to investigate the influence of gravity segregation and their magnitude in the case of gas injection into a volatile oil reservoir. The results show that in stratified and dipping reservoirs where the permeability decreases with depth, smaller the vertical to horizontal permeability ratio, lesser is the effect of gravity segregation, better is the sweep efficiency and hence better is the recovery. In the case of increasing permeability with depth in stratified dipping reservoirs, an up-dip gas injection into a volatile oil reservoir was found to be a favourable condition in term of recovery. Gravity forces have a considerable effect on volatile oil recovery via gas injection and the need for determining not only the fluid characteristics but also the reservoir heterogeneities was significant

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Section: A Effect Of Decreasing Permeability With Depth On Gravity Se...contrasting

confidence: 56%

“…The volumetric sweepout during miscible and immiscible displacement is always less than 100% because of (Syahrial, 1997): -permeability stratification, -viscous fingering, -gravity segregation, -incomplete areal sweepout.…”

Section: Introductionmentioning

confidence: 99%

Modeling Gravity Segregation In Stratified And Dipping Reservoir Of Volatile Oil

Syahrial¹

2022

SCOG

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“…The effect of composition variation with depth on volatile oil under depletion and miscible gas processes will be illustrated using a new compositional simulation approach 7,8 . The new formulation has an implicit equation for the oil-phase pressure and water saturation, an explicit equation for the hydrocarbon saturation, and explicit equation for the overall composition of each hydrocarbon component that satisfies thermodynamic equilibrium.…”

Section: Compositional Simulationmentioning

confidence: 99%

Effect Of Composition Variation With Depth On Volatile Oil Reservoirs

Syahrial¹

2022

SCOG

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It has been known that the distribution of hydrocarbon components in a fluid column is affected of gravity. Many authors have shown the effect of composition variation within a hydrocarbon column due to gravity. In thick reservoirs as the depth increases, the mole fraction of the lighter hydrocarbon decreases, whereas the heavy fraction increases. These variations may affect reservoir fluid properties considerably. In studying reservoir processes, especially with miscible displacements, it is essential to have of underlying mechanisms. In this paper, we investigate the effect of composition variation with depth on volatile oil under depletion and miscible gas processes. A ternary diagram was used to identify the process displacement mechanisms at different locations. A new efficient compositional simulationapproach was used to model the volatile oil reservoir bahaviour. It was shown that the decreasing light component with depth caused different miscible displacement processes as the oil composition move toward limiting tie line in the ternary diagram. Saturation and reservoir pressures variation with depth were not linear in a thick reservoir. This non linearity increased with the increased in volatility of the oil. In the case of depletion, the concentration of light component decreased below its original composition in the produced layers. In vaporising-gas drive the light component gradually vaporized from the bottom to the top of reservoir, whereas the intermediate component decreased below its original composition from the bottom to the top of the reservoir

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Condensate gas blockage simulation in a gas reservoir: a case study of a gas field in the Mahakam Delta, East Kalimantan, Indonesia

2018

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Development of a novel compositional simulation approach to model recovery from volatile oil reservoirs

Cited by 3 publications

References 0 publications

Modeling Gravity Segregation In Stratified And Dipping Reservoir Of Volatile Oil

Modeling Gravity Segregation In Stratified And Dipping Reservoir Of Volatile Oil

Effect Of Composition Variation With Depth On Volatile Oil Reservoirs

Condensate gas blockage simulation in a gas reservoir: a case study of a gas field in the Mahakam Delta, East Kalimantan, Indonesia

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