【正文】 to 6186。104t/MPa. The annual output of oil decreased from the highest 104t to 104t, with the annual declining 12% . Late in this stage, 16 wells were open, producing of liquid and of oil per day with the water cut %, whose working fluid level was 958m. In this stage, the oil output reached 104t at the recovery percentage %. Cumulative oil production was 104t covering % of the reserves. Flooding Development Stage, June 1998June 1999Block Luo801 was developed by flooding in June 1998, first with Wells L8017, L80115, L80117. At the end of this stage, 13 wells were open, producing of liquid and of oil per day with the water cut %. The working fluid level was 1399m. At this stage, 104t of oil, % of the reserves, was obtained. The cumulative oil production reached 104t, % of the reserves. MEOR Test Stage, July 1999December 2010MEOR was launched in Luo801 in July 1999. In the initial phase, microorganisms was injected into three injection wells (L8017, L80115, L80117), in September 2002 the recovery pattern was adjusted to have the middle two injection wells ( L8013, L80118) injected with the aid of air pressors injecting air.As of December 2010, 14 oil wells in Luo801 were put into operation, 12 were opened and producing of liquid and of oil per day. The cumulative oil recovery was 104t with the water cut %, covering % of the reserves. The oil producing rate was %. A total of five injection wells were opened, injecting per day with a cumulative injection 104m3. The monthly injectionproduction ratio was and the cumulative injectionproduction ratio was . Two MEOR test wells were injected with 145m3 of water per day. 4. Overview of MEOR Field Test Implementation The implementation of MEOR field test of Block Luo801 can be divided into two phases. July 1999 to September 2002 is the routine MEOR phase, when microbial liquid and nutrient were injected from the three side injection wells. The liquid contains 4 types of bacteria, producing similar substance as biosurfactant。Figure 3 Actual production and decline forecast curves of Luo 801 Development Effect Improvement1) Slow the natural declineAfter the implementation of MEOR, the production decline has slowed down significantly in Luo801 with the highest natural decline rate from 32% to % in 2005. Though production has an overall downward trend, the average decline rate is far lower than that before flooding recovery ( Figure 4). Figure 4 Production decline curve of the test area 2) Enhance oil recoveryAfter the implementation of flooding and MEOR, the situation has been improved in Luo801. The recovery rate rises obviously, which was % based on Flooding Dynamic Calibration, increasing by % over the one calculated with the empirical formula of Shengli Oilfield, %. If the MEOR operation goes on under the current conditions, the ultimate oil recovery rate is expected to increase by % to achieve extra recoverable reserves 180。104 t. Extend Oil Pump Inspection Cycle Statistics of the oil pump inspection cycle before and after MEOR show that the inspection cycle is prolonged tremendously, months vs months, months outreached. Analysis reveals that microorganisms and their metabolic production migrated to oil wells to lower the speed of waxing and to maintain the shaft. Better than Flooding Recovery of Same Type Fault Block Oil Reservoir Blocks Luo9 and Luo801 of Luojia Oilfield are of the same type development units with similar reservoir conditions. Luo9 is situated to the s