Method for injecting non-condensable gas or in-situ combustion to recover remaining oil in a heavy oil reservoir with bottom water

A method for injecting non-condensable gas or application of in-situ combustion to recover remaining oil in a heavy oil reservoir with bottom water, comprising the following steps:

• Step S10:
• drilling a new horizontal well in an oil layer between an existing horizontal production well location and a top of a bottom water layer;
• Step S20:
• preheating the new horizontal well, wherein during the preheating stage, an operating pressure at a bottom hole of the new horizontal well is equal to a pressure of the bottom water layer to prevent an injected fluid from entering the bottom water layer, including using an original vertical gas injection well to inject air or flue gas into an existing steam chamber, and increasing a pressure in the steam chamber to be the same as the bottom water pressure;
• Step S30:
• after a horizontal section of the new horizontal well is in thermal communication with an upper steam/gas chamber, converting the new horizontal well into a continuous production well, including shutting in the original upper horizontal well when the steam/gas chamber is too low;
• Step S40:
• after an initial stage of the production of the new horizontal well, drilling a new vertical well in an unswept reservoir area, wherein the newly drilled vertical well and the new horizontal well form a new vertical well and new horizontal well combination;
• Step S50:
• after achieving fluid communication in the oil layer between the new vertical well and the new horizontal well, injecting air or oxygen into the new vertical well to create a combustion condition underground, and producing a heated crude oil and combustion gas from the new horizontal well;
• and
• Step S60:
• when the new horizontal well enters the later stage, stopping gas injection and gradually reducing the pressure in the steam/gas chamber until an end of oil production.