Gravity-assisted steam flooding exploitation method for heavy laver common heavy oil reservoir

The present invention is a heavy oil reservoirs gravity mining thick layer of the auxiliary steam flooding mining method, a thick layer of heavy oil reservoirs in general, make a direct steam injection wells, horizontal wells or horizontal wells produce steam injection, horizontal well production methods . Have been developed for vertical wells reservoir block, a straight and horizontal wells using a combination of well pattern, along a lower portion of the reservoir block known reservoir drilling horizontal production well, that the steam injection wells in a linear ramp over horizontal wells, injection and production wells 2-4 wells while steam cycle throughput and production wells or steam injection wells are formed in thermal communication with the reservoir pressure or reduced to 3-4MPa, steam injection well into the production well production extraction steam injection; or steam injection wells and production wells have been formed in thermal communication the new drill horizontal production well stimulation cycle, after the lifting of pollution near wellbore, turn steam injection wells produce steam injection well production mining. The present invention can play a role and sweep fluid displacement in the vertical and horizontal directions, to improve the sweep range of the drive fluid, heavy oil reservoirs to enhance oil recovery thick layers.