Abstract: In order to address the serious problem of steam channeling in the reservoir development by steam flooding, a high-temperature channeling blocking system based on multi-group cross linked gel was developed. An evaluation was made on its temperature resistance, steam plugging capability, and erosion resistance. It was found in the study that the high-temperature channeling blocking system based on multi-group cross linked gel could stably generate gel under high temperature of 130 ℃, and the gel had a good stability after 120 d at 250 ℃, and excellent plugging performance; the plugging rate of the gel-based channeling blocking system was as high as 99.63% at high temperature when the injection speed was 1 mL/min and the plugging agent volume injected was 0.8 time the pore volume, and the breakthrough pressure gradient was 7.35 MPa/m; at 250 ℃, the channeling blocking system was completely gelling in the sand-filled pipe, and the plugging rate was maintained above 98% after high-temperature steam flushing (30 times the pore volume), with good flushing resistance. The channeling blocking system has proven to be highly effective in plugging with steam by on-site application, effectively solving the problem of steam channeling in the development with steam flooding of heavy oil reservoir, and it can provide a technical support for the efficient development of heavy oil reservoir.

Key words: steam flooding, steam channeling, gel system, high temperature resistance, plugging rate, heavy oil