General approach to characterizing reservoir fluids for EoS models using a large PVT database

Abstract

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Density, compressibility and phase equilibrium of high pressure-high temperature reservoir fluids up to 473 K and 140 MPa

“…For the characterization of the C7 + fraction of the reservoir fluid samples, we used the methods described by Yan et al [22] and Varzandeh et al [3] which are based on the characterization method of Pedersen et al [23,24]. The difference from the method of Pedersen et al lies in how the model parameters are estimated.…”

“…In the second step, the parameter estimation for SRK and PR was performed by using Twu's correlation [25] for pc and Tc and Lee-Kesler correlation [26] for . For PC-SAFT, the correlations of Varzandeh et al [3] were used to calculate the model parameters. In the last step the SCN components were lumped into a few pseudo-components with approximately equal mass.…”

“…An in-house calculation code [3,22] was used for all the calculations. In principle, group contribution based characterization methods such as the method of Skjold-Jørgensen [27] could also be used for characterization.…”

“…The volumetric and phase equilibrium properties are necessary for the estimation of oil and gas resources and the description of the dynamic production process which involves single-phase expansion, phase transition and vapour-liquid equilibrium in the two-phase region. Density and compressibility play a crucial role in production forecast of the pressure depletion process [2,3], as compressibility is a driving force in the primary recovery. Regarding gas condensates, once the reservoir pressure decreases below the saturation pressure, valuable liquid hydrocarbons can drop out and tend to stay in the reservoir [4].…”

Equations of State with Group Contribution Binary Interaction Parameters for Calculation of Two-Phase Envelopes for Synthetic and Real Natural Gas Mixtures with Heavy Fractions

“…Prior to phase equilibrium calculations, the unknown fraction needs to be discretized into a certain number of Single Carbon Numbers (SCN) and then the SCN need to be characterized by available methods [8][9][10]. With the advances of molecular-type equations of state, characterization of petroleum fluids has been remained an active field of research [11,12]. As the equilibrium measurements for real gas mixtures are difficult to measure, expensive and limited, numerical methods using Equations of State (EoS) have become imminent [13,14].…”