减氧空气驱低温氧化反应机理研究--以尕斯库勒油田E3^1油藏为例

尕斯库勒油田E3^1油藏中原油属性为轻质油藏,该油藏已经进入高含水时期,储采失衡加剧,综合含水率达到了80%以上,原油产量下降,经济效益变差。为了解决这一问题,采取了减氧空气驱注气提高采收率的方法提高原油采出程度。低温氧化反应为轻质原油和空气中的氧气发生氧化反应。为了研究低温氧化反应的主控因素和提高原油的采出程度,针对尕斯库勒油田E3^1油藏建立水平方向和纵向的一维条形地层,分析不同低温氧化反应的机理模型,不同温度和不同氧气摩尔浓度对尕斯库勒油田E3^1油藏采出程度的影响。结果表明:温度对油藏采出程度有一定影响,表现为温度越高,氧化反应越充分,反应速度越快,采出程度越高;不同的低温氧化反应机理模型对原油采出程度有略微影响,但不明显;氧气摩尔浓度的变化对原油采出程度无明显变化。

Study on mechanism of low temperature oxidation reaction of deoxidized air drive:taking E13 reservoir of Gaskule oilfield as an example

The crude oil properties of the E¹₃ reservoir in the Gaskule Oilfield are light oil reservoirs.The oil reservoir has entered a period of high water cut,the storage-production imbalance has intensified and the comprehensive water cut has reached more than 80%.In order to solve this problem,the method of reducing oxygen and flooding gas injection was adopted to increase the recovery factor to increase the degree of crude oil recovery.The low-temperature oxidation reaction involves the oxidation of light crude oil and oxygen in the air.In order to study the main controlling factors of low-temperature oxidation reaction and increase the degree of crude oil recovery,a horizontal and vertical one-dimensional strip formation was established for E¹₃ reservoir in Gaskule oilfield and the mechanism models of different low-temperature oxidation reactions were analyzed.The effect of different temperatures and different molar concentrations of oxygen on the production degree of the E¹₃ reservoir in the Gaskule Oilfield.The results show that temperature has a certain effect on the recovery degree of the reservoir.The higher the temperature,the more complete the oxidation reaction,the faster the reaction speed and the higher the recovery degree.Different low-temperature oxidation reaction mechanism models have a slight effect on the recovery degree of crude oil.Affect,but not obvious,the change of oxygen molar concentration has no obvious change on the degree of crude oil recovery.