Gel composite water plugging method for heavy oil thermal recovery producing well and application of gel composite water plugging method

The invention relates to a gel composite water plugging method for a heavy oil thermal recovery producing well and application of the gel composite water plugging method, and belongs to the technical field of heavy oil water plugging. The gel composite water plugging method comprises the following steps that a foaming agent, first nitrogen, a gel profile control agent, a fly ash profile control agent and second nitrogen are sequentially injected, and a nitrogen foam slug, a gel slug, a fly ash slug and a nitrogen slug are sequentially formed to plug a water channeling dominant channel; the total volume V of the foaming agent, the first nitrogen, the gel profile control agent, the fly ash profile control agent and the second nitrogen is equal to piR2h phi; the water plugging radius is selected to be 12-16 m after 5-10 turns of huff and puff, and the water plugging radius is selected to be 16-25 m after more than 10 turns of huff and puff. According to the gel composite water plugging method, not only can a mai