Ketone Solvent to Reduce the Minimum Miscibility Pressure for CO2 Flooding at the South Sumatra Basin, Indonesia

Adi Novriansyah,Changhyup Park,Wisup Bae,Asep K Permadi,Shabrina Sri Riswati

doi:10.3390/pr8030360

Adi Novriansyah, Changhyup Park + Show 3 more

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https://doi.org/10.3390/pr8030360

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Abstract

This paper experimentally analyzes the chemical additives, i.e., methanol and ethanol, as alcohol solvents, and acetone as a ketone solvent, and the temperature influencing the minimum miscibility pressure (MMP) that is essential to design miscible CO2 flooding at an oil field, the South Sumatra basin, Indonesia. The experiments were designed to measure CO2-oil interfacial tension with the vanishing interfacial tension (VIT) method in the ranges up to 3000 psi (208.6 bar) and 300 degrees Celsius. The experiment results show that lower temperatures, larger solvent volumes, and the acetone were effective in reducing MMP. The acetone, an aprotic ketone solvent, reduced MMP more than the methanol and the ethanol in the CO2-oil system. The high temperature was negative to obtain the high CO2 solubility into the oil as well as the lower MMP. The experimental results confirm that the aprotic ketone solvent could be effective in decreasing the MMP for the design of miscible CO2 flooding at the shallow mature oilfields with a low reservoir temperature.

Highlights

Minimum miscibility pressure (MMP), i.e., the minimum pressure making CO2 and a crude oil mixture miscible in a reservoir, is essential to designing CO2 flooding as one of the enhanced-oil-recovery (EOR) methods [1,2,3]
The results show that the aprotic ketone solvent is effective in reducing minimum miscibility pressure (MMP), but the optimal design of the CO2 -acetone mixture is not proposed in these experiments, which is essential for CO2 -injecting facilities
This paper presents the experimental analyses for the effects of solvents, temperatures, and oil types on MMP decrement

Summary

Introduction

Minimum miscibility pressure (MMP), i.e., the minimum pressure making CO2 and a crude oil mixture miscible in a reservoir, is essential to designing CO2 flooding as one of the enhanced-oil-recovery (EOR) methods [1,2,3]. In addition to CO2 capture, CO2 geological storage has been a growing interest as enhanced oil recovery, i.e., CO2– EOR, in mature oil fields [6,7,8,9]. Indiscriminate exploration and development of oil fields have led to a reduction of reservoir pressure above expected levels so that gas injection into the reservoir had to be implemented to maintain reservoir pressure. Maintaining the high reservoir pressure requires a large amount of natural gas or nitrogen for injection into mature oilfields, and, CO2– EOR would become an eco-friendly sequestration and a profit-generating business model in Indonesia

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