关键词: 栲胶, 碱木素, 超稠油,  , 热采, 氮气泡沫

Abstract: After multiple rounds of steam huff and puff processes, problems of excessive steam injection pressure, a large heat loss, a small sweep range of steam, and steam channeling arise, thus severely affecting the effective utilization of the oil reservoir. To solve these problems, one dimensional and three dimensional (3D) physical simulation tools were used to study the plugging performance of high temperature composite foamsby adding tanning extract and alkali lignin. The influence of reservoir temperature, salinity of formation water, and injection methods was investigated. The experimental results show that the foam can produce a synergistic effect with both the gel systems, indicating that the gel increases the stability of the foam. The foam can transfer more gel into the high permeability formation, thus efficiently controlling the foam. The 3D physical simulation experiments indicate that both the systems enhance the recovery of heavy oil reservoir and reduce its moisture content significantly using steam injection. The method involving tannin extract foam and steam injection increased the recovery by 20% compared to the foam involving only steam injection. The method involving alkali lignin foam and steam injection increased the recovery by 11%.

Key words: Tannin, Alkali lignin, Super extra heavy oil, Thermal recovery, Nitrogen foam