School of Petroleum Engineering,China University of Petroleum East China Key Laboratory of Unconventional Oil Gas Development China University of Petroleum East China,Ministry of Education
Aiming at the serious problems of steam channeling for steam flooding, the combination of high-temperature channeling plugging agent and oil displacement agent were prepared. The high-temperature-resistant channeling plugging agent was prepared with tannin extracts system, the sulfonate surfactant and anionic-nonionic surfactant were compounded to obtain high-temperature oil displacement agent, then the compound profile-control and oil displacement technology of channeling plugging agent and oil displacement agent on improving the recovery rate of steam flooding was investigated by heterogeneous double-tube physical simulation experiments. The results showed that the plugging rate of high temperature tannin extracts plugging agent could maintained above 90% after 15 PV of steam flooding flushing at 250℃, had significantly plugging properties. After aging at 300℃, the high temperature oil displacement agent SLB/CY (2:1) could still reduce the oil-water IFT to below 0.001mN/m. In the experiment of heterogeneous double-tube by steam flooding of heavy oil, the combination of channeling plugging agent and oil displacement agent can effectively plug the steam channeling of high permeability tube and ensure the subsequent injection of oil displacement agent into low permeability tube, which can improve the final comprehensive oil drive efficiency by 23.58% and effectively improve the development effect of steam flooding in heterogeneous formation.