A New Simple CO2 Minimum Miscibility Pressure Correlation

Abstract

The minimum miscibility pressure (MMP) is one of the most important parameter to be determined in miscible gas injection projects to ensure and maximize the displacement sweep efficiency inside the reservoir. Usually the most effective way of determining the MMP is to run slim tube experiments. However, in the early screening stage, we often relay on the published empirical correlations to estimate the MMP and identify the candidate fields for EOR gas injection projects. The main objective of this paper was to examine different published empirical CO 2 MMP correlations using measured data mainly obtained from Libya and other published resources, and also to develop a new simple reliable correlation to be applied in the oil industry. The data collected covered a wide range of CO 2 MMP (1544-6244 psia) and oil API gravity (28-50ºAPI). Minitab regression tool was extensively used in our study and a wide range of new constructed correlations ranging from simple to complex ones were developed and statistically evaluated. The proposed simple CO 2 MMP correlation is mainly function of the measured Pb, API, T and Rsi and has very reliable degree of accuracy (SD=6.7%, ARE=0.44%, AARE=5.74%, R 2 =95.22%) for the examined data and has shown better performance when compared with the industry popular correlations. The new correlation was validated against 100 measured PVT variables (Pb, Rsi, T and API) obtained from Libya, and the predicted CO 2 MMP results have demonstrated very reliable trend (within the measured CO 2 MMP trend) with no anomalies.

Intelligent Prediction of Minimum Miscibility Pressure (MMP) During CO2 Flooding Using Artificial Intelligence Techniques

“…However, the laboratory measurements are costly and time-consuming [5]. MMP can also be determined using empirical correlations, but these correlations can lead to significant deviations, where the absolute error can reach up to 25% [6][7][8][9][10]. Several empirical correlations were proposed to estimate the MMP based on the reservoir condition and the fluids compositions.…”

“…The empirical correlations were developed utilizing regression approaches. The common correlations are the Glaso correlation, Sebastian et al correlation and Khazam et al correlation [6,8,9]. Generally, the accuracy of the empirical correlations is increasing as the mathematical complexity of the equation increases.…”

Simulation study on co2 enhanced oil recovery for offshore area in Thailand

“…The empirical correlation of MMP of this method is varied from 15 to 19 Mpa approximately. is presented for another calculation of MMP (Khazam et al, 2016). Table 22.2 Summary of MMP (MPa) and relative error predicted by experimental and different empirical correlation (Li et al, 2021) Whenever the reservoir pressure is above an MMP but below the fractured pressure, in theoretically, the oil recoveries could be as high as 90% of the OOIP in the CO2 swept region.…”