Wettability of reservoir rocks as the most important factor of the distribution of water, oil and gas in their capacity space
UDC: 552.578.2:532.64
DOI: 10.33285/2413-5011-2022-10(370)-57-60
Authors:
BOLSHAKOV YULIY YA.1,
NEYOLOVA EVGENIA YU.1
1 Tyumen Industrial University, Tyumen, Russia
Keywords: wettability, hydrophilic reservoir, hydrophobic reservoir, capillary pressure, water, oil, gas, prospecting, exploration, development, reservoir, water-flooding
Annotation:
The practice of prospecting for oil and gas does not usually take into account wetting properties of reservoir rocks, which often brings significant negative consequences. The wettability of a reservoir determines the sign of the capillary pressure at the water-oil contact in its capacitive space. In a hydrophilic rock, the capillary pressure is positive; in a hydrophobic one, it is negative. The sign of capillary pressure in combination with the properties of liquids and gases to spontaneously assume a position and shape, at which their surface energy reaches a minimum value, leads to the fact that in a hydrophilic reservoir oil and gas occupy relatively large pores and cracks, and water has a relatively small pore space. The reverse picture is observed in a hydrophobic reservoir, where water tends to relatively large pores and cracks, and oil and gas tend to relatively small ones.
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