Down-hole fluid separation self-displacement well adopting self-injection-and-production in same well and same layer, and mining method

The invention provides a down-hole fluid separation self-displacement well adopting self-injection-and-production in the same well and the same layer, and a mining method. The down-hole fluid separation self-displacement well comprises a master well, one or more injection well sections, one or more production well sections and a down-hole fluid separation system; the master well comprises a masterwell straight well section and a master well horizontal section located in a reservoir, and an injection flow pass and a production flow pass not communicating with each other are formed in the master well; the one or more injection well sections communicate with the injection flow pass to form an injection channel, and a first injection mechanism is arranged in the injection channel; the one ormore production well sections communicate with the production flow pass to form a production channel, and a first production mechanism is arranged in the production channel; and the down-hole fluid separation system is arrange