The invention relates to the technical field of oilfield
fracturing fluid additives, and discloses a phase permeability modifier for oilfield fracturing and a preparation method thereof. The phase permeability modifier for oilfield fracturing is prepared from the following raw materials: an emulsifying agent, diesel oil, an initiator, a polymeric
monomer and water. A reservoir or middle and high
water cut oilfields with complicated oil-water relationships can realize the effects of reducing the
oil well water yield, improving the
oil pump capacity and achieving water control and oil increase, so that the productivity of oil is improved; the phase permeability modifier is a long-chain high-molecular
polymer, can effectively increase the water-phase permeability, is little in influence on oil-phase permeability, and has
high selectivity water control performance; besides, the phase permeability modifier has high back-displacement performance and relatively high adsorption capacity; compared with the prior art, the drag reduction phase permeability modification performance is more excellent, and the
oil well yield can be increased by more than 10%; and moreover, the phase permeability modifier is simple in production and loose in using condition, so that the phase permeability modifier can be widely applied to fracturing production increasing technique of oil-
water layer reservoir phase permeability fracturing.