The Application of MEOR in Daqing Oilfields
- Zhaowei Hou (Daqing Oilfield Co. Ltd.) | Xumou Dou (Daqing Research Institute) | Rui Jin (Daqing Oilfield Co. Ltd.) | Rui Wang (Daqing Oilfield Co. Ltd.) | Yanling Wang (Daqing Oilfield Co. Ltd.) | Wei Li (Daqing Oilfield Co. Ltd.) | Jianjun Le (Daqing Oilfield Co. Ltd.)
- Document ID
- Society of Petroleum Engineers
- SPE Enhanced Oil Recovery Conference, 19-21 July, Kuala Lumpur, Malaysia
- Publication Date
- Document Type
- Conference Paper
- 2011. Society of Petroleum Engineers
- 5.4.10 Microbial Methods, 4.3.4 Scale, 4.1.2 Separation and Treating, 5.2.1 Phase Behavior and PVT Measurements, 2.4.3 Sand/Solids Control, 5.4.1 Waterflooding
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To seek an effective oil recovery approach, Brevibacillus brevis and Bacillus cereus were screened and applied in a Microbial Enhanced Oil Recovery (MEOR) process to recover oil from Daqing low permeability oilfield where have many disadvantageous conditions. Microbial huff and puff trials have been conducted in 93 wells with accumulative incremental oil amounting to 100878 barrels and average of 1081.9 barrels for one individual well. The effective ratio was 74.2%. Microbial flooding field test with 2 injectors and 10 producers was carried out.7 out of 10 wells showed effective results, with 105995 barrels of accumulative incremental oil. In October 2009, expanding field test with 9 injectors and 24 producers was carried out in this block. Now 15 wells have shown good effect with oil production increased by 41.6%. The analysis showed that wells with good injection-production relationship, differences of layers and well deliverability are main effects to the results of microbial huff and puff. The microbial flooding results showed that wells along the main channel sand and developed fracture zones had a better response.
Daqing periphery oilfields have the unfavorable features of low permeability, poor reservoir physical property, thin reservoir,low single-well output and oil with high viscosity and freezing point. Due to these adverse conditions, the efficiency of traditional water flooding in these areas is low. The injection pressure increased and oil production decreased dramatically. Meanwhile, low fluidity of crude oil and the easily damaged thin reservoir restrict the application of many tertiary oil recovery technologies. With the intensive research on mechanism of Microbial Enhanced Oil Recovery (MEOR) and its continuous expanded application scale, Microbial huff and puff technology has become a relatively mature stimulation treatment. Microbial Enhanced Oil Recovery technology plays more important role in the development of low permeability oilfields.
In 1990,a microbial huff and puff test for 2 wells was launched in Saertu Oilfield, with accumulative incremental oil amounting to 61073 barrels. But there are some disadvantages such as large quantity of injection material and the microorganisms use carbohydrate as the carbon source. Based on the reservoir characteristics of periphery oilfields, Brevibacillus brevis and Bacillus cereus (cell size from 1.8 × 3.48 µ m to 0.4 × 0.8-1.2 µ m) were screened and applied in microbial huff and puff test and microbial flooding field tests.
1 Microbial huff and puff test
1.1 Microbial huff and puff test in Daqing Chaoyanggou oilfield
The permeability of Chaoyanggou oilfield is between (2-30) ×10-3µm2 with average permeability of 10×10-3µm2. It is a fracture morphology and low permeability oilfield. The microbial huff and puff test was conducted in three different kinds of reservoirs involving 60 wells. A total of 1498.6 barrels of bacteria fluid was injected. After injection, wells were shut in for 5-7 days.
43 wells showed a significant oil production increase, with 71.7% efficiency. The cumulative incremental oil production was 67072.9 barrels. An average of 1118.4 barrels of incremental oil was produced for each well and the ratio of produced oil and injected microbial solution was about 466.0(barrels/barrels). The second round field test of Microbial huff and puff has been conducted in 4 effective wells. (Fig. 1) The same achievement as the first round indicated Microbial huff and puff for single well can be used for many times.
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