Application of water-blocking and oil-permeable proppant in the high water-cut reservoir

Considering that the conventional proppant quartz sand fails in control the water cut of the produced fluid in fracturing stimulation Daqing Oilfield at the ultra-high water cut stage, the water-blocking and oil-permeable proppants were developed. The quartz sand was coated by organosilicon compound with active groups, and the lyophobic and lipophilic property was imposed on the surface of quartz sand to improve the water control ability of proppants. The laboratory evaluation shows that the oil wettability index of the proppant is greater than 0.75, and the permeation capacity of oil is more than 10 times that of water under a certain pressure difference. The success rate of water control is 100%, which is 54 percentage points higher than that of conventional proppant. This proppant provides a new method for reducing the development cost and increasing the recoverable reserves.