油藏非生物因素耗氧实验研究

注入多少氧气是好氧微生物驱油技术亟待解决的问题。采用高压氧化管作为反应器，通过分析反应前后气体组分的变化，探讨了胜利油田某区块原油、注入水和产出水的耗氧情况。结果表明：对70℃的油藏，非生物因素耗氧主要是氧气对原油的低温氧化作用。6.3MPa、70℃，高压空气与原油充分反应12d，平均每克原油耗氧20.15mg，其中3.29%转化为CO2；5.8MPa、70℃，高压空气与注入水体积比为1∶23，充分反应12d，每升注入水耗氧11.12mg，其中95.00%转化为CO2；6.3MPa、70℃，高压空气与产出水体积比为1∶23，充分反应12d，每升产出水耗氧3.9 mg，几乎完全转化为CO2。该研究工作将为空气辅助微生物驱油技术提供理论依据。

EXPERIMENT ON ABIOTIC FACTOR OXYGEN CONSUMPTION OF THE RESERVOIR

To aerobic microbial enhanced oil recovery, determining the amount of oxygen injection is a problem urgently to be solved. Oxygen consumption of crude oil, injected water and produced water of one block in Shengli Oilfield is probed by analyzing changes of gas composition before and after the reaction in highpressure oxidation tubes. The results suggeste that abiotic oxygen consumption of reservoirs at 70℃ is mainly the lowtemperature oxidation of crude oil. The oxygen consumption per gram crude oil is 20.15 mg after 12d oxidation reaction at 6.3MPa, 70℃ and 3.29% consumed oxygen formes CO2. The oxygen consumption per liter injected water is 11.12mg after 12 d oxidation reaction when the ratio of high pressure air to injected water is 1∶23 at 5.8MPa, 70℃, and 95.00% consumed oxygen formes CO2. The oxygen consumption per liter produced water is 3.98mg after 12d oxidation reaction when the ratio of high pressure air to produced water is 1∶23 at 6.3MPa, 70℃, and almost all the consumed oxygen formes CO2. The results will provide theoretical basis for microbial enhanced oil recovery by adopting airassistant technique.