By studying the shape and geometrical properties of tetrahedral gap in the intermeshing co rotating twin screw, a mathematical model to precisely calculate the volume of tetrahedral gap has been developed in this paper, which was simplified by approximation using a third order spline function, served as a powerful tool for designing and deepening research into twin screw.

Experimental study on rock pore volume compressibility

Based on the Buckley-Leverett equation (φ-Function),the relationship between residual oil saturation and the pore volume of cumulative fluid flow rate in one-dimensional homogeneous formation model was established.

The effect of mobility control agent (PAM solution) of different mass concentration and different pore volume on oil recovery efficiency in alkaline water-flooding is studied by using the artificial core.