The invention relates to a fracturing
backflow liquid finely-filtering device and method. The device comprises a
liquid storage tank, a lifting pump, a primary filter, two parallelly-arranged secondary filters, and a
storage tank; the
liquid storage tank is connected to the water suction
pipe of the lifting pump, the
water discharge pipe of the lifting pump is connected to the water inlet
pipe of the primary filter, the
water discharge pipes of the primary filter are respectively connected to the water inlet pipes of two secondary filters, and the
water discharge pipes of the secondary filters are connected to the
storage tank. The primary filter is arranged vertically, the secondary filters are horizontally arranged, the water inlet pipe of the primary filter is arranged on the upper part, and the water
discharge pipe is arranged on the lower part. The filter device is used to finely filter the recyclable fracturing liquid, after the fine
filtration, the fracturing liquid can be reused and applied to liquid preparation; and the fracturing liquid which cannot be recycled, can be applied to a
post treatment after the suspended impurities are removed by the fine
filtration. The provided filter device and method have the advantages that the filter area is large, the
processing efficiency is high, the operation is simple and convenient, the maintenance is convenient, and solved is the technical problem that the
recovery is difficult due to the high content of suspended impurities in the fracturing
backflow liquid.