Scientific and technical journal

«Geology, geophysics and development of oil and gas fields»

ISSN 2413-5011

Geology, geophysics and development of oil and gas fields
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.

Bibliography:

1. Mukher A.G. Geologicheskoe stroenie i neftegazonosnost’ yury Zapadnoy Sibiri. – Tyumen’: Izd-vo "Nauka-Servis", 2018. – 503 s.

2. Bol’shakov Yu.Ya., Neelova E.Yu., Salova K.V. Osobennosti razrabotki zalezhey nefti, priurochennykh k gidrofobnym kollektoram v usloviyakh vodonapornogo rezhima // Geologiya, geofizika i razrabotka neftyanykh i gazovykh mestorozhdeniy. – M.: OAO "VNIIOENG", 2020. – № 6(342). – S. 53–55. – DOI:10.30713/2413-5011-2020-6(342)-53-55

3. Masters J.A. Deep basin gas trap, Western Canada // BAAPG. – 1979. – Vol. 63. – № 2. – Pp. 152–169.

4. Anderson W.G. Wettability Literature Survey. Part 2: Wettability Measurement // Journal of Petroleum Technology. – November 1986. – Pp. 1246–1262.