4 results about "Enhanced oil recovery" patented technology

The invention relates to a method for cracking a strata with organic materials to improve the recovery ratio of an adjacent oil-bearing reservoir stratum. The method comprises the following steps that(1), heat is injected to an organic shale, and the shale is heated to above 150 DEG C; (2), CO2, and C2 to C5 light hydrocarbon gases produced by initial cracking of organic materials are conveyed toadjacent oil-bearing reservoir stratum, the pressure of the oil-bearing reservoir stratum increases, contained oil is completely soluble with the CO2 and the light hydrocarbon, and therefore gas flooding and CO2 / light hydrocarbon miscible enhanced oil recovery is formed; (3), crude oil in the oil-bearing reservoir stratum is produced from an oil production well installed in the reservoir stratum;(4), the heat is continuously injected to the shale, the temperature rises to above 320 DEG C, volume gas and light oil are generated and are produced through the oil production well mounted in the shale; and (5), during the termination of shale oil production, the oil production well with the oil-bearing reservoir stratum is started again, gas flooding of oil-bearing reservoir stratum is carriedout by natural gas continuously produced the shale at high temperature, and therefore the recovery ratio of the oil-bearing reservoir stratum is maximized. The high recovery ratio is obtained, and fracture to the oil-bearing reservoir stratum is not required. The economic benefits are obviously improved.