Research on Fracturing Effect of the Second Kind of Oil Layer Weak Alkali Ternary Composite Flooding

Abstract

The main reason for the low production of oil wells in the second type of oil wells is the poor development of the oil layer itself and the near-wellbore pollution caused by the scaling of the ternary composite system. By analyzing the dynamic and static factors affecting the fracturing of the production well, it is known that the fracturing effect is better when the formation pressure is higher than the saturation pressure after fracturing; the effective thickness is greater than 5 m, the first type of connectivity is greater than 30%, and the high water flooding thickness ratio is less than 40%, production liquids with a drop of more than 20%, a water cut of more than 5%, and a chemical flooding degree of less than 15% can achieve better oil and precipitation effects. For the weak alkali ternary composite flooding type II oil layer with permeability greater than 100×10-3μm2, the conductivity of fracturing has little effect on the fracturing effect, and the fracturing timing is the key factor to determine the fracturing effect.