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Rising bubble apparatus (RBA) provides accurate, cost-effective measurement of minimum
miscibility pressure. The most essential feature of the apparatus is a flat glass
tube mounted vertically in a high pressure sight gauge in a temperature controlled
oven. The glass tube is flat for better examination of bubbles rising in opaque
oils and is approximately 20 cm long. The glass tube is back lit for visual observation
of the tube contents. A hollow needle is mounted at the bottom of the of the sight
gauge and protrudes into the rounded portion of the glass tube. The tip of the needle
is kept about 3 - 5 centimeters below the flat portion of the tube. Initially the
sight gauge and glass tube are pre-filled with deionised water at the initial test
pressure and reservoir temperature. Reservoir oil is then injected downwards into
the flat glass tube, displacing the water until only the lower circular portion
of the glass tube contains any water. A small gas bubble is then formed at the tip
of the hollow needle and eventually launched into the tube. The bubble rises through
the water, through the water/oil interface and up through the column of oil. After
two or three bubbles have risen through the oil the contaminated oil is replaced
with a fresh batch of reservoir oil.
The behaviour of the gas bubble is monitored using a motion tracking optical system
consisting of a video camera mounted on a rail parallel to the path of the rising
bubble. The magnified view of the bubble can be viewed on screen and is recorded
as a small movie clip (mpeg).
Core Laboratories record the lifetime of each injected gas bubble in seconds (calculated
from number of captured frames) at each test pressure and use this data to interpolate
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