Treatment technology of high water content wells in the super heavy oil reservoir of Pai 6 south block.

In response to the problems of reduced formation pressure, insufficient reservoir energy, and serious water flooding of oil wells in the southern part of Block 6 of Chunfeng Oilfield (Xinjiang, China) due to high cycles of steam stimulation, based on the geological conditions and reasons for high water cut in the block, nitrogen foam profile control and microbial oil recovery technology were proposed. A comprehensive treatment technology for high water content wells with microbial technology as the main focus and plugging and adjustment technology as the auxiliary was formed. The actual application effect of this technology was tested. The resistance factor and residual resistance factor of nitrogen foam were 540 and 270, respectively, which were higher than those of contrast foam. The core pressure value was greater than that of the contrast foam with good plugging property. By using this technology, the water content of the oil wells in the southern block of the rear row decreased and the oil production increased with a maximum oil increase of 847 ton. Microbial oil recovery experiments found that microbial strains could reduce the viscosity with the maximum decrease of 78.3%. The cumulative total oil production after expanding the experimental wells of microbial oil recovery technology was 3,286 ton. To sum up, the nitrogen foam profile control and microbial oil recovery technologies proposed in the study could effectively improve the recovery efficiency in super heavy oil reservoirs in southern Pai 6 block. The innovation of the research was the combination of nitrogen foam profile control and microbial oil recovery technology, which enriched the current research on the treatment of high water cut wells in super heavy oil reservoirs and provided new ideas and technical guidance for the treatment of high water cut wells in super heavy oil reservoirs. It had positive significance in improving the recovery of high water cut wells in super heavy oil reservoirs. [ABSTRACT FROM AUTHOR]