微生物采油技術(shù)在中國勝利油田羅801區(qū)塊試驗(yàn)a英文譯文2-資料下載頁
2025-04-07 03:32本頁面
【正文】 R stage, its ground viscosity of crude oil reached , the viscosity difference between water and oil was relatively large. The water cut and recovery percentage curves of the two blocks show when recovery percentage is greater than 20%, Luo801 curve extends downward to form a “funnel”. The development data of Luo801after adopting MEOR can establish the recovery of Luo801 as %, better than flood development recovery in Luo9. This shows that MEOR effect is better than that of water flooding (Figure 5). Figure 5 Relationship between water cut and recovery percentage curves Characteristics of Microbial Activity in ReservoirsDuring the test, microorganisms and their metabolic production of the produced fluid have been sampled and analyzed regularly. The analysis result shows that after implementing MEOR, the bacterial density increases significantly in the produced fluid, gradually stabilizing at a magnitude 1034 / ml, while density of the sample before the test is only below 10 / ml. Analysis on concentration of acetate in the produced fluid discloses that average acetate concentration from the test area is 70mg/L before the test, which changes to , averaging mg/L, after the implementation of MEOR(Figure 6). During the test, the position of produced gas was analyzed and the relative concentration of methane gas was found to increase (Figure 7). The researchers believe that as the anaerobic anaerobicbacteria in the reservoir is activated, part of the acetate is utilized by anaerobic microorganisms to have the acetate concentration decrease. Monitoring on the methanobacterium content in the produced fluid reveals that the number of total bacteria and methanogenic bacteria levels continue to rise, which might be caused by acetatelike metabolic production migrating to deep of the oil reservoir and being utilized by methanogens in anaerobic environment. Figure 6 Water injection and acetate content curves in produced fluid of Luo801 Figure 7 Detection of methane gas in Luo801 Electrophoresis analysis of TRFLP and DGGE shows that, microbial species and number are very abundant in Block Luo801, with widespread archaea flora such as Thermodesulfovibrio and Methanobacterium, bacteria such as Pseudomonas and Bacillus, which have adapted to the reservoir conditions and whose ecological structure is gradually stabilizing. 6. Conclusions MEOR technology has improved development in Block Luo801, but not as the chemical flooding technique to have significantly and substantially increased the production. Production by MEOR increases mildly but remains effective in longer time, which might be a feature of MEOR. Analysis on produced liquid samples from the oil wells show that during the implementation of MEOR, the acetate content increases significantly and maintains at high concentration levels, suggesting a strong microbial metabolism in the reservoir. However, the bacteria types injected were not found in the produced liquid, only to find some mon bacteria and archaea flora in reservoirs, which is speculated that the bacteria injected were absorbed into the porous media in the reservoir, or simply the bacteria could not survive in the reservoir environment, and the microbial activity in the reservoir is of the indigenous bacteria activated by injected nutrient. As of the end of December 2010, the cumulative 3235t of microbial fluid and 3475t of nutrient were injected in the test area with an output of additional 104t crude oil. The cost of each incremental tonne of oil is about 165。 .
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