Method and Device for Measuring the Minimum Miscibility Pressure of Two Phases

1) A method for measuring the minimum miscibility pressure of two phases, a liquid and a gas phase, wherein the two phases are placed in a cell under a given pressure, characterized in that it comprises the following stages:

• a) injecting one of the phases into said cell through an injection line, at a given flow rate so as to form globules, such as liquid drops or gas bubbles, of the injected phase in the other phase, and discharging the injected phase from the cell at a second flow rate allowing the cell to be maintained at a constant pressure,
• b) determining a number of globules of the injected phase per time unit, by continuous measurement of the differential pressure between the inside of the cell and the injection line,
• c) establishing, for the given flow rate, a function ƒ relating the inverse of the number of globules of the injected phase per time unit to the pressure within the cell, by varying pressure within the cell and by repeating stages a) and b) for each pressure, and
• d) estimating the minimum miscibility pressure of the two phases by means of pressure within the cell for which function ƒ is equal to zero.