The Differential Pressure-driven Hydrocarbon Migration In Porous Media, Experimental Study

EXPERIMENTS OF OIL AND GAS MIGRATION DRIVEN BYDIFFERENTIAL PRESSURE IN POROUS MEDiUMAbstractThe study of oil and gas migration mechanism has been the hotspot in the realm of reservoir-formation study in recent years. The differential pressure is one of the important kinetic condition in oil and gas migration from source rock to pore medium, which is related to compaction, expansion and structural crush pressure. Because pore medium is filled with water at first, the process of oil and gas migration is that the oil and gas is continually refilled and water escaped under differential pressure. We made a series of experiments on oil and gas migration driven by differential pressure in porous medium, which are as follow:l.When the water is drainaged by oil and gas or the mixture of oil~. gas and water ,the character of oil and gas migration is dominated by the wettability of pore medium.2.Oil and gas always migrate along a channel in water-wet pores under differential pressure. The frontal point is limited (often one or several pore). With the distance between the frontal points and flooding points increasing, the spindle or taper migration pathways may form.3.In the two-dimensional experiment, the frontier of oil and gas migration prolongs up under differential pressure.4.In the two-dimensional experiment, the oil and gas migration is not continuous but intermittent. The gas often streams quickly under differential pressure.