The role of capillary pressure curves in reservoir simulation studies.
ABSTRACT:
Capillary forces are one of effective parameters in Hydrocarbon Reservoirs which are notable in the porous media. Capillary pressure is one of input data in reservoir simulation process which should be considered in history matching procedures. This paper is going to study the role of capillary pressure by using a black oil software named “IMEX”. The data is about a given reservoir which is studied for, the curvature and capillary pressures Hysterises is simulated and also water coning in well is a checking point for capillary pressure effect.
毛管力定义：
Capillary pressure is one of important parameter in porous media. This term is related to capillary phenomena in capillary tube. The connected porous in a reservoir rock could be considered as capillary tube with very low diameter. Because of different wettabillity in porous surface with respect to two phases (i.e. water and oil) different forces are distributed on the contact surface, if the surface is enough small, it causes a bending inside the one of phases. It means that the pressure of two phases is not equal on the contact surface. In this case, the lower pressure is related to the phase whose curvature of surface is towards to inside. The difference is named capillary pressure which could be measured. as shown by Pc and is. PO – PnP = Paw The notion w & nw is wetting phase and Non-wetting phase respectively, this amount is always a positive quantity and also is depended to different factor such as rock and fluid properties and the structure of porous media. It is recommended that the petroleum engineers calculate for water and oil as below:
Pc = PO - Pw
The notations o and w show the oil and water phases. Therefore it can sometimes be negative
