Rising Bubble Apparatus

Manufacturer: Vinci Technologies
Model Number: RBA-700

The RBA test is a reliable and fast way to determine the minimum miscibility pressure (MMP) during a vaporizing gas drive injection study. The method involves direct visual observation of the behaviour of a injected gas bubble rising into a column of reservoir oil. Under miscible conditions, the bubble disappears before it reaches the top; under immiscible conditions, the bubble is visible throughout its flow. The cell is filled with distilled water. Enough oil is injected into the cell to displace all but a short column of water in the cell’s lower end. Next, a small bubble of gas of the desired composition is launched into the water. The buoyant force on the bubble causes it to rise through the column of water, then through the water/oil interface. As the bubble rises through the oil, its shape and motion are observed and photographed with two cameras. Between 3 and 30 seconds are needed for the bubble to rise the length of the oil column. After two or three bubbles have risen through the column of oil, the used oil is replaced with fresh oil. For a gas / oil pair, rising bubble experiments are repeated over a range of pressures. From the pressure dependance of the behaviour of the rising bubbles, MMP is inferred.



Working Pressure : 10,000 psi (700 bar)
Working Temperature : 175°C (350 F)
Sightglass viewing area : 230 mm x 8 mm
Internal section : 5 mm x 1 mm
Needle tip diameter : 0.91 mm
Material : Stainless steel, sapphire
Fluids : Water, oil, HC gas, CO2, solvent
Electrical requirements : 220 VAC- 50/60 Hz – 1 phase

  • Fast results
  • Visible results
  • Less expensive that slim tube method
  • Minimal fluid sample required