OIL EXTRACTION METHOD OF ESTABLISHING OIL-PERMEABLE WATER-RESISTANT SIEVE BY FILLING FUSHENG SAND INTO FRACTURE OF HORIZONTAL WELL

摘要

An oil extraction method of establishing an oil-permeable water-resistant sieve by filling Fusheng sands into a fracture of a horizontal well. Fusheng sands having an oil-permeable water-resistant function are filled into a vertical facture of a horizontal well between a water injection well row and an oil extraction well row as a propping agent, to form an oil-permeable water-resistant sieve between the water injection well and the oil extraction well, so that an oil extraction area is separated into a water injection area and an oil extraction area by the oil-permeable water-resistant sieve. Under the action of the pressure of injected water, when an oil-water mixture passes through the oil-permeable water-resistant sieve, water is trapped in the water injection area, and raw oil permeates the oil-permeable water-resistant sieve and is accumulated at a side of the oil extraction area of the sieve. When all oil in the water injection area permeates the oil-permeable water-resistant sieve and enters the oil extraction area, because no raw oil passes through the sieve, the pressure of the injected water in the water injection area is sharply increased, the sieve is turned into a water-permeable sieve, and the water permeating the sieve continuously drives the remaining oil in the oil extraction area to enter the oil well. By adopting the oil extraction method, most of the remaining oil in an oil field can be extracted, so that the oil extraction rate approaches 100%.