The invention relates to a waterflooding
swallowing-
spitting method for double fracturing
horizontal wells through zipper-type crack distributing. The waterflooding
swallowing-
spitting method comprises the following steps that in an initial production stage, the two
horizontal wells are simultaneously exploited for a period of time through
natural energy; in the horizontal well I, a waterflooding
control unit I corresponding to an odd stage crack is started, water is injected into an oil
pipe I, the injected water enters the odd stage crack, meanwhile in the horizontal well II, a waterflooding
control unit II corresponding to an even stage crack is started, water is injected into an oil
pipe III, and the injected water enters the even stage crack; well openings of the two
horizontal wells are simultaneously closed to stew the wells, and
crude oil and the injected water are imbibed and replaced; and the well openings of the two horizontal wells are simultaneously opened to extract the oil, in the horizontal well I, an oil extracting
control unit I corresponding to the even stage crack is opened, the
crude oil is extracted out of the even stage crack, in the horizontal well II, an oil extracting control unit II corresponding to the odd stage crack is opened, and the
crude oil is extracted out of the add stage crack. The waterflooding and extracting method can effectively displace
residual oil between the wells, between the cracks and in a dead oil area, and the swept volume is improved.