Well Deliverability Forecasting of Gas Condensate and Volatile Oil Wells below Saturation Pressure

Ogunrewo, O.; Herens, T.; Gringarten, Alain C.

doi:10.2118/164869-ms

Cited by 5 publications

(2 citation statements)

References 32 publications

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“…In gas condensate reservoirs, a fourth region may also exist in the vicinity of the wellbore where low interfacial tension at high velocities causes decrease in oil saturation and increase in relative permeability of gas (Gringarten et al 2000). Later studies showed that this effect is more pronounced with gas condensate fluids than with volatile oils (Ogunrewo et al 2013). However, since there is no firm understanding about the existence of this region in volatile oil reservoirs (Sharifi and Ahmadi 2009;Sanni and Gringarten 2008), it is not considered in the present study.…”

Section: Introductionmentioning

confidence: 88%

Volatile oil well test analysis: application of two-phase pseudo-pressure approach

Baniasadi

Rashidi

2019

J Petrol Explor Prod Technol

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This study investigates flow behavior in the volatile oil reservoirs with two-phase flow around the wellbore and the application of two-phase pseudo-pressure function for well test analysis in such volatile oil reservoirs. To this end, flow behavior and saturation profile of the volatile oil reservoirs with flowing bottom-hole pressure below the bubble point pressure are investigated using a synthetic reservoir model. Subsequently, well test behavior of this reservoir in drawdown and buildup tests are examined. Finally, the application of two-phase pseudo-pressure concept is examined for analyzing well test data of the volatile oil reservoir. It is shown that two-phase flow near the wellbore causes a composite behavior in well test data with decreasing mobility during drawdowns and increasing mobility during buildups. Moreover, employing normalized two-phase pseudo-pressure function introduced in this study is found to be a suitable method for well test analysis in volatile oil reservoirs. Using the aforementioned method, effective permeability and wellbore skin are estimated by eliminating the effect of gas saturation on the well test results.

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Section: Introductionmentioning

confidence: 88%

Volatile oil well test analysis: application of two-phase pseudo-pressure approach

Baniasadi

Rashidi

2019

J Petrol Explor Prod Technol

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“…Three sets of volatile oil reservoirs have been developed. Compared with the components of traditional black oil and condensate gas, the main feature of volatile oil is that the content of intermediate hydrocarbons (C2-C6) is much higher than that of black oil and condensate gas [1]. The content of light component (C1) and heavy component (C7+) is between black oil and condensate gas.…”

Section: Crude Oil Composition and Phase Analysismentioning

confidence: 99%

Numerical Simulation Considering Non-Equilibrium Phase Change Volatile Oil Reservoir: A Case Study of Wenchang 8-3 Oil Reservoir

Xu¹

2021

IJG

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As a typical volatile oil reservoir, the actual production characteristics of Wenchang 8-3 reservoir are inconsistent with the results of traditional phase equilibrium experiments. The conventional isothermal instantaneous phase equilibrium theory cannot meet the production performance or numerical simulation analysis requirements of this type of reservoir. The thermodynamic properties of volatile oil reservoirs are like those of condensate gas reservoirs. As the formation pressure drops below the dew point pressure during the mining process, the balance between the liquid phase and the gas phase is not completed instantaneously. Based on the non-equilibrium phase recovery treatment method of the condensate gas reservoir, the phase behavior change curve of the A4h well of Wenchang 8-3 oil reservoir recovered from the saturation pressure to three different pressures is analyzed. The accuracy of the numerical simulation results with or without non-equilibrium phase transition is compared. The results show that the non-equilibrium phase change has a great impact on the production performance of volatile oil reservoirs; the numerical simulation results considering the non-equilibrium phase transition are in good agreement with the actual production performance of a single well and can better reflect the actual situation of this type of reservoir. Therefore, considering the effects of non-equilibrium phase transitions has important guiding significance for the dynamic analysis of volatile oil reservoirs, numerical simulation, and the formulation of development management strategies.

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Deconvolution of Well Test Data in Lean and Rich Gas Condensate, and Volatile Oil Wells below Saturation Pressure

Ogunrewo

Gringarten

2013

SPE Annual Technical Conference and Exhibition

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Deconvolution is a recent milestone in well test analysis which converts multirate pressure data into a single drawdown at constant rate. It yields a pressure derivative with a duration equal to the duration of the test, thus providing more pressure data to interpret than with conventional techniques; and gives access to the true radius of investigation of the test. In addition, the deconvolved derivative is free from distortions due to the pressure derivative calculation algorithm and from errors introduced by incomplete or truncated rate histories. Theoretically, deconvolution is only valid for linear systems. In practice, it is also used, with pseudo-pressures, for dry gas, and even for gas condensate and volatile oil below saturation pressure. As these systems are highly non-linear, there has been some concerns about the validity of such an approach. This paper investigates the use of deconvolution for gas condensate and volatile oil below saturation pressure. Using compositional simulation, it applies deconvolution to different reservoir geometries using two-phase pseudo-pressures, which linearize the reservoir-fluid system by replacing the two-phase fluid below saturation pressure by a single fluid equivalent. Comparison with deconvolution using single-phase pseudo-pressure (for gas condensate) or pressure (for volatile oil) shows that the resulting deconvolved derivatives are similar, and in particular exhibit similar late time behaviours, thus justifying the simpler pseudo-pressure (resp., pressure) approach. Simulation results were verified with actual data from vertical and horizontal wells in a number of gas condensate and volatile oil reservoirs.

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Well Deliverability Forecasting of Gas Condensate and Volatile Oil Wells below Saturation Pressure

Cited by 5 publications

References 32 publications

Volatile oil well test analysis: application of two-phase pseudo-pressure approach

Volatile oil well test analysis: application of two-phase pseudo-pressure approach

Numerical Simulation Considering Non-Equilibrium Phase Change Volatile Oil Reservoir: A Case Study of Wenchang 8-3 Oil Reservoir

Deconvolution of Well Test Data in Lean and Rich Gas Condensate, and Volatile Oil Wells below Saturation Pressure

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