The slim-tube test
employs a long-coiled tube packed with a specific mesh size of sand.
The solvent (CO2) was injected at a specific temperature
into the oil-saturated tube at several test pressures. Oil recovery
was then measured as a function of pressure. The estimated MMP of
the oil–solvent system is represented by the intersection between
the two trend lines in the graph. The experiment conducted in the
current study refers to two prior studies, i.e., Abdurrahman et al.17 and Adel et al.18 (link)Figure 3 depicts
the slim-tube test experiment diagram. The system involves of a high-pressure
cell with a 12 mm diameter, 80 mm height, 16 mm thickness, and a sapphire-based
material. The cell was installed in an air bath system with a heater
to keep the temperature stable. A cooler equipped with a precision
ISCO pump was utilized to inject CO2. The cooler was used
to maintain the liquid state of CO2 before it was injected
into the cell. Additionally, a stirring bar was placed at the bottom
of the cell to mix oil and CO2 until an equilibrium was
reached. The specifications of the slim tube are provided inTable 3 .
Before starting the measurement, the cell was thoroughly
washed
with toluene and dried with nitrogen. The cell was then filled with
a 2.7 cm3 filtered crude oil sample, or about 30% of the
total volume under room conditions, as suggested by Alhosani et al.28 (link) The current experiment used the same temperature
as the IFT experiment by injecting CO2 gas into the cell
at a specific pressure level. Next, the pressure was gradually increased
by 200 psi until it reached 2400 psi. In parallel, the stir bar inside
the cell was rotated continuously to allow a CO2–crude
oil mixture equilibrium. According to Adel et al.,18 (link) data point selection should be based on linear trends instead
of the transitional zone to prevent MMP deviation.
employs a long-coiled tube packed with a specific mesh size of sand.
The solvent (CO2) was injected at a specific temperature
into the oil-saturated tube at several test pressures. Oil recovery
was then measured as a function of pressure. The estimated MMP of
the oil–solvent system is represented by the intersection between
the two trend lines in the graph. The experiment conducted in the
current study refers to two prior studies, i.e., Abdurrahman et al.17 and Adel et al.18 (link)
the slim-tube test experiment diagram. The system involves of a high-pressure
cell with a 12 mm diameter, 80 mm height, 16 mm thickness, and a sapphire-based
material. The cell was installed in an air bath system with a heater
to keep the temperature stable. A cooler equipped with a precision
ISCO pump was utilized to inject CO2. The cooler was used
to maintain the liquid state of CO2 before it was injected
into the cell. Additionally, a stirring bar was placed at the bottom
of the cell to mix oil and CO2 until an equilibrium was
reached. The specifications of the slim tube are provided in
Before starting the measurement, the cell was thoroughly
washed
with toluene and dried with nitrogen. The cell was then filled with
a 2.7 cm3 filtered crude oil sample, or about 30% of the
total volume under room conditions, as suggested by Alhosani et al.28 (link) The current experiment used the same temperature
as the IFT experiment by injecting CO2 gas into the cell
at a specific pressure level. Next, the pressure was gradually increased
by 200 psi until it reached 2400 psi. In parallel, the stir bar inside
the cell was rotated continuously to allow a CO2–crude
oil mixture equilibrium. According to Adel et al.,18 (link) data point selection should be based on linear trends instead
of the transitional zone to prevent MMP deviation.
