塔河油田高温高盐油藏冻胶调驱技术研究

In order to further enhanced oil recovery of high-temperature and high salinity reservoir in Tahe Oilfield, profile control and oil displacement technology of gel was carried out in this paper. static evaluation and dynamic evaluation were carried out through GSC strength code method, ESEM, and physical simulation experiment device. The field test also be carried out in Tahe Oilfield. The results show that, under the condition of high temperature and salinity (temperature 100.8 ℃, salinity 19.6×104 mg/L ), the stable gel system was formed with gelling time ranging from 26h to 45 h, gel strength ranging from E to H, and dehydrating amount lower than 3.0% after ageing 60 d. And the microstructure is very stable. When permeability ranges from 0.212 μm2 to 0.905 μm2 and gel strength ranges from E to H, the plugging ratio is bigger than 85%, and the plugging performance become stronger with permeability or gel strength increasing. Profile control and oil displacement technology of gel can effectively promote fluid diverting, the profile improvement rate is 99.88% and the enhancement in oil recovery is up to 28.5%. Field test was carried out in Xidaliya reservoir of Tahe Oilfield, the water cut reduced from 95.2% to 89.0%. It means that profile control and oil displacement technology of gel has good stabilizing oil production ability by water control. And this technology has a wide application prospect, which provides stong technical support for further enhanced oil recovery in Tahe high temperature and high salinity reservoir.