A novel system for reducing CO2-crude oil minimum miscibility pressure with CO2-soluble surfactants

Fuel ◽  
2020 ◽  
Vol 281 ◽  
pp. 118690 ◽  
Author(s):  
Chao Zhang ◽  
Linghui Xi ◽  
Pingkeng Wu ◽  
Zhaomin Li
Keyword(s):  
Crude Oil ◽  
Minimum Miscibility Pressure ◽  
Soluble Surfactants

scholarly journals Experimental Study on Reducing CO2–Oil Minimum Miscibility Pressure with Hydrocarbon Agents

Energies ◽  
2019 ◽  
Vol 12 (10) ◽  
pp. 1975 ◽  
Author(s):  
Junrong Liu ◽  
Lu Sun ◽  
Zunzhao Li ◽  
Xingru Wu
Keyword(s):  
Crude Oil ◽  
Petroleum Ether ◽  
Oil Recovery ◽  
Mass Concentration ◽  
Co2 Flooding ◽  
Oil Viscosity ◽  
Injection Wells ◽  
Boiling Range ◽  
Minimum Miscibility Pressure ◽  
Soluble Surfactants

CO2 flooding is an important method for improving oil recovery for reservoirs with low permeability. Even though CO2 could be miscible with oil in regions nearby injection wells, the miscibility could be lost in deep reservoirs because of low pressure and the dispersion effect. Reducing the CO2–oil miscibility pressure can enlarge the miscible zone, particularly when the reservoir pressure is less than the needed minimum miscible pressure (MMP). Furthermore, adding intermediate hydrocarbons in the CO2–oil system can also lower the interfacial tension (IFT). In this study, we used dead crude oil from the H Block in the X oilfield to study the IFT and the MMP changes with different hydrocarbon agents. The hydrocarbon agents, including alkanes, alcohols, oil-soluble surfactants, and petroleum ethers, were mixed with the crude oil samples from the H Block, and their performances on reducing CO2–oil IFT and CO2–oil MMP were determined. Experimental results show that the CO2–oil MMP could be reduced by 6.19 MPa or 12.17% with petroleum ether in the boiling range of 30–60 °C. The effects of mass concentration of hydrocarbon agents on CO2–oil IFT and crude oil viscosity indicate that the petroleum ether in the boiling range of 30–60 °C with a mass concentration of 0.5% would be the best hydrocarbon agent for implementing CO2 miscible flooding in the H Block.

Use CO2 Soluble Surfactant to Decrease the Minimum Miscibility Pressure of CO2 Flooding in Oil Reservoir

2011 ◽  
Vol 239-242 ◽  
pp. 2650-2654
Author(s):  
Fu Chen ◽  
Jie He ◽  
Ping Guo ◽  
Yuan Xu ◽  
Cheng Zhong
Keyword(s):  
Citric Acid ◽  
Crude Oil ◽  
Water System ◽  
Viscosity Reduction ◽  
Mass Ratio ◽  
Oil Viscosity ◽  
Minimum Miscibility Pressure ◽  
Oil Water ◽  
Carbon Dioxide Miscible Flooding ◽  
Soluble Surfactant

According to the mechanisms of carbon dioxide miscible flooding and previous researchers’ work on synthesis of CO2-soluble surfactant, Citric acid isoamyl ester was synthesized, and it’s oil solubility and the rate of viscosity reduction both in oil-water system and oil were evaluated. And then we found that this compound can solve in oil effectively; the optimum mass of Citric acid isoamyl ester introduced in oil-water system is 0.12g when the mass ratio of oil and water is 7:3 (crude oil 23.4g, formation water 10g) and the experimental temperature is 50°C , the rate of viscosity reduction is 47.2%; during the evaluation of the ability of Citric acid isoamyl ester to decrease oil viscosity, we found that the optimum dosage of this compound in 20g crude oil is 0.2g when the temperature is 40°C, and the rate of viscosity reduction is 7.37% at this point.

scholarly journals An Improved CO2-Crude Oil Minimum Miscibility Pressure Correlation

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
Hao Zhang ◽  
Dali Hou ◽  
Kai Li
Keyword(s):  
Experimental Data ◽  
Crude Oil ◽  
Relative Error ◽  
Oil And Gas ◽  
Empirical Correlation ◽  
Volatile Components ◽  
Absolute Relative Error ◽  
Minimum Miscibility Pressure ◽  
New Correlation ◽  
Average Absolute Relative Error

Minimum miscibility pressure (MMP), which plays an important role in miscible flooding, is a key parameter in determining whether crude oil and gas are completely miscible. On the basis of 210 groups of CO2-crude oil system minimum miscibility pressure data, an improved CO2-crude oil system minimum miscibility pressure correlation was built by modified conjugate gradient method and global optimizing method. The new correlation is a uniform empirical correlation to calculate the MMP for both thin oil and heavy oil and is expressed as a function of reservoir temperature, C7+molecular weight of crude oil, and mole fractions of volatile components (CH4and N2) and intermediate components (CO2, H2S, and C2~C6) of crude oil. Compared to the eleven most popular and relatively high-accuracy CO2-oil system MMP correlations in the previous literature by other nine groups of CO2-oil MMP experimental data, which have not been used to develop the new correlation, it is found that the new empirical correlation provides the best reproduction of the nine groups of CO2-oil MMP experimental data with a percentage average absolute relative error (%AARE) of 8% and a percentage maximum absolute relative error (%MARE) of 21%, respectively.

Reducing the minimum miscibility pressure of CO2 and crude oil using alcohols

2019 ◽  
Vol 568 ◽  
pp. 105-112 ◽  
Author(s):  
Zihao Yang ◽  
Wei Wu ◽  
Zhaoxia Dong ◽  
Meiqin Lin ◽  
Shuwei Zhang ◽  
...  
Keyword(s):  
Crude Oil ◽  
Minimum Miscibility Pressure

A rigorous approach to predict nitrogen-crude oil minimum miscibility pressure of pure and nitrogen mixtures

2015 ◽  
Vol 399 ◽  
pp. 30-39 ◽  
Author(s):  
Mohammad Fathinasab ◽  
Shahab Ayatollahi ◽  
Abdolhossein Hemmati-Sarapardeh
Keyword(s):  
Crude Oil ◽  
Rigorous Approach ◽  
Minimum Miscibility Pressure

scholarly journals A new empirical correlation of minimum miscibility pressure for produced gas reinjection

2020 ◽  
Vol 38 (4) ◽  
pp. 867-883
Author(s):  
Congge He ◽  
Zifei Fan ◽  
Chenshuo Zhang ◽  
Anzhu Xu ◽  
Lun Zhao ◽  
...  
Keyword(s):  
Crude Oil ◽  
Relative Error ◽  
Empirical Correlation ◽  
Critical Parameters ◽  
Average Relative Error ◽  
Cell Method ◽  
Minimum Miscibility Pressure ◽  
Miscible Gas Injection ◽  
Acidic Components ◽  
Key Parameter

Minimum miscible pressure is a key parameter to screen and design miscible gas injection projects. The aim of this paper is to establish a correlation with only a few input parameters to easily and accurately predict minimum miscible pressure for the reinjection of produced gas with high acidic components. First, the critical parameters of equation of state for each component of the crude oil were obtained through fitting pressure-volume-temperature (PVT) experimental results. Based on the analytically calculated minimum miscible pressures from mixing-cell method, an empirical correlation for predicting minimum miscible pressure in the displacement of crude oil by produced gas was regressed. Finally, the correlation’s accuracy was tested by comparing the minimum miscible pressures predicted from the new proposed correlation to other previous correlations and 20 experimental slim-tube minimum miscible pressures of 12 oil samples. The results indicate that the analytically calculated minimum miscible pressures from the mixing-cell method have a relative error of 0.5% compared to the slim-tube experiment results, which supports its reliability. Furthermore, the new proposed correlation is observed to be superior in terms of the average relative error being only 6.4% for all the 75 analytically calculated minimum miscible pressures and 20 experimental slim-tube minimum miscible pressures, which is lower than the average relative error obtained from other previous correlations.

scholarly journals Determination and evaluation of minimum miscibility pressure using various methods: experimental, visual observation, and simulation

2019 ◽  
Vol 74 ◽  
pp. 55 ◽  
Author(s):  
Muslim Abdurrahman ◽  
Wisup Bae ◽  
Asep Kurnia Permadi
Keyword(s):  
Interfacial Tension ◽  
Crude Oil ◽  
Oil And Gas ◽  
Visual Observation ◽  
Tension Test ◽  
Tube Test ◽  
Minimum Miscibility Pressure ◽  
Strong Point ◽  
Two Samples ◽  
Valuable Method

This research proposes a simultaneous technique using various methods to yield the most reliable Minimum Miscibility Pressure (MMP) value. Several methods have been utilized in this study including slim tube test, swelling test, vanishing interfacial tension test, visual observation during swelling test and vanishing interfacial tension test, and simulation. The proposed method may reduce the uncertainty and avoid doubtful MMP. The method can also demonstrate discrepancies among the results. There were two samples used in this study namely Crude Oil AB-5 and Crude Oil AB-4. It showed that for Crude Oil AB-5 the discrepancies among the results from that of the slim tube test were between 3.9% and 10.4% and 0% and 5.9% for the temperature of 60 °C and 66 °C, respectively. The highest discrepancy was shown by the results from the visual observation during vanishing interfacial tension test and the lowest discrepancy was shown by the results from the swelling test. The vanishing interfacial tension test was found to be the fastest method for predicting the MMP. The method also consumed a smaller amount of oil and gas samples for the experiment. The simultaneous method proposed in this study is considered as more proper and exhibits a valuable method for predicting the MMP. This technique has never been found to be performed by previous researchers and accordingly it becomes the strong point of this study to contribute to the global research in the area of MMP determination.

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