微生物采油技術(shù)在中國勝利油田羅801區(qū)塊試驗a英文譯文2-文庫吧在線文庫
【正文】 ic 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。MEOR Field test at Block Luo801of Shengli Oil Field in ChinaAbstractA Microbial Enhanced Oil Recovery (MEOR) field test has been implemented for 10 consecutive years at the 75℃80℃ Block Luo801 in Shengli Oil Field in China, where microbial formulation and nutrient, producing biosurfactant, were injected into oil wells. After the implementation of MEOR, the produced fluid samples from the oil wells were analyzed and found an increase of bacteria and archaea in waterphase stabilizing at 1034cell/ml and a soar of acetate in concentration from 70mg/L to mg/L without finding the type of injected microbial types, suggesting the nutrient injected has activated the indigenous bacteria in the reservoir, whose activities were enhanced to prevent the water cut from rising up in the block so as to increase the oil output. Up to December 2010, the cumulative increased production of oil has been 104t with the total output surpassing that of Water Flooding Oil Recovery (WFOR) by %. Considering the cost of injected microbial fluid and nutrient, oil increased per tonne costs about . Keywords: Microbial Enhanced Oil Recovery (MEOR), Field Test, Water Flooding 1. IntroductionFault block oil reservoirs occupy an important proportion in Shengli Oil Field of China, whose developed geological reserves have reached 108t but with the prehensive water cut %. Thus how to stop the production decline and enhance the crude oil recovery bees a major challenge to develop fault block oil reservoirs with high water cut. Due to the smaller area bearing oil and the inplete production well grid, it is not suitable to carry out chemical enhanced oil recovery technology for fault block oil reservoirs and alternative oil recovery technology is expected to be develop
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