油页岩油藏原位电加热开采数值模拟研究
发布时间：2018-10-24 19:05
【摘要】：我国的油页岩资源储量丰富,仅次于美国、巴西、俄罗斯,预估为万亿吨级别,大约能产出百亿吨级的页岩油。美国等国家的油页岩油藏开发已经进入区块开采商业化阶段,目前主要开采方式为水平井分段压裂。而我国对于油页岩油藏的开发尚处于现场试验阶段,并未大量投产。但是日益紧张的能源供需关系突出了油页岩开发的必要性。本文根据国内外油页岩油藏原位电加热的实验和计算数据,分析了有油页岩油藏的特点以及各参数随温度的变化规律,初步建立了油页岩单井电加热的电热转换数学模型、温度场数学模型、产量及其他开发指标的数学模型。在单井数学模型的基础上,主要运用叠加原理建立双井电加热的温度场和产量数学模型。然后,建立了油页岩油藏开发的经济评价数学模型。利用上述数学模型,对实际的单井、双井电加热油页岩的温度分布和产量等进行了模拟预测,并对影响油页岩开发的敏感性因素,如加热功率、成油率、油藏厚度、油层传热系数及井距等对温度场和产量的影响进行分析,最后,对油页岩油藏生产进行经济评价。计算表明:当加热功率为1000k W时,油井在4个月后开始出油,随后出油量逐渐增加;单井不同加热功率(1000kW、750k W、500kW),其最高产量分别为17.5t/d、13.8t/d和3.3t/d,表明加热功率越大,油井产量越高;对于成油率、油藏厚度、油层热传导系数等对产量的影响也有相同规律;在研究双井电加热时,相同加热功率时,双井电加热的单井产量要高于单井电加热产量;而对于不同井距(50m、40m、30m)时,油井最高产量分别为17.15t/d、22.5t/d、23.6t/d,表明双井井距越小,产量越高。经济效益主要受油价影响更大,在不导致油页岩层焦化的前提下,应选择1000k W加热井进行加热。研究结论为油页岩油藏的实际开发利用提供了理论依据和预测方法。
[Abstract]:China's oil shale reserves are abundant, second only to the United States, Brazil and Russia, with an estimated trillion tons of shale oil to produce. The development of oil shale reservoirs in the United States and other countries has entered the commercial stage of block production. At present, the main production method is horizontal well fracturing. However, the development of oil shale reservoir in China is still in the stage of field test and has not been put into production in large quantities. But the increasingly tight energy supply-and-demand relationship highlights the need for oil shale development. Based on the experimental and computational data of in-situ electric heating in oil shale reservoirs at home and abroad, the characteristics of oil shale reservoirs and the variation of various parameters with temperature are analyzed, and a mathematical model of electrothermal conversion for single well heating of oil shale is established preliminarily. Mathematical model of temperature field, mathematical model of yield and other development index. Based on the mathematical model of single well, the mathematical model of temperature field and production rate of electric heating in double well is established by using superposition principle. Then, the mathematical model of economic evaluation of oil shale reservoir development is established. By using the above mathematical model, the temperature distribution and production rate of oil shale with electric heating in single well and double well are simulated and forecasted, and the sensitive factors such as heating power, oil forming rate, reservoir thickness and so on, which affect the development of oil shale, are also studied. The effects of reservoir heat transfer coefficient and well spacing on temperature field and production are analyzed. Finally, the economic evaluation of oil shale reservoir production is carried out. The calculation results show that when the heating power is 1000kW, the oil well starts to produce oil after 4 months, and then the oil production increases gradually, and the maximum output of single well with different heating power (1000kW / 750kW / W) is 17.5 t / d 13.8t / d and 3.3 t / d, respectively, indicating that the higher the heating power is, the higher the oil production is. The effects of oil formation rate, reservoir thickness and reservoir thermal conductivity on the production are the same, and the single well production of double well electric heating is higher than that of single well electric heating when the electric heating of double well is studied and the heating power is the same. For different well spacing (50m ~ 40m ~ 30m), the maximum production of the well is 17.15t / d 22.5t / d 23.6t / d, which indicates that the smaller the well spacing is, the higher the production is. The economic benefit is mainly affected by oil price. Without coking oil shale formation, 1000kW heating well should be selected for heating. The results provide theoretical basis and prediction method for the development and utilization of oil shale reservoir.
【学位授予单位】：中国石油大学(华东)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD83
[Abstract]:China's oil shale reserves are abundant, second only to the United States, Brazil and Russia, with an estimated trillion tons of shale oil to produce. The development of oil shale reservoirs in the United States and other countries has entered the commercial stage of block production. At present, the main production method is horizontal well fracturing. However, the development of oil shale reservoir in China is still in the stage of field test and has not been put into production in large quantities. But the increasingly tight energy supply-and-demand relationship highlights the need for oil shale development. Based on the experimental and computational data of in-situ electric heating in oil shale reservoirs at home and abroad, the characteristics of oil shale reservoirs and the variation of various parameters with temperature are analyzed, and a mathematical model of electrothermal conversion for single well heating of oil shale is established preliminarily. Mathematical model of temperature field, mathematical model of yield and other development index. Based on the mathematical model of single well, the mathematical model of temperature field and production rate of electric heating in double well is established by using superposition principle. Then, the mathematical model of economic evaluation of oil shale reservoir development is established. By using the above mathematical model, the temperature distribution and production rate of oil shale with electric heating in single well and double well are simulated and forecasted, and the sensitive factors such as heating power, oil forming rate, reservoir thickness and so on, which affect the development of oil shale, are also studied. The effects of reservoir heat transfer coefficient and well spacing on temperature field and production are analyzed. Finally, the economic evaluation of oil shale reservoir production is carried out. The calculation results show that when the heating power is 1000kW, the oil well starts to produce oil after 4 months, and then the oil production increases gradually, and the maximum output of single well with different heating power (1000kW / 750kW / W) is 17.5 t / d 13.8t / d and 3.3 t / d, respectively, indicating that the higher the heating power is, the higher the oil production is. The effects of oil formation rate, reservoir thickness and reservoir thermal conductivity on the production are the same, and the single well production of double well electric heating is higher than that of single well electric heating when the electric heating of double well is studied and the heating power is the same. For different well spacing (50m ~ 40m ~ 30m), the maximum production of the well is 17.15t / d 22.5t / d 23.6t / d, which indicates that the smaller the well spacing is, the higher the production is. The economic benefit is mainly affected by oil price. Without coking oil shale formation, 1000kW heating well should be selected for heating. The results provide theoretical basis and prediction method for the development and utilization of oil shale reservoir.
【学位授予单位】：中国石油大学(华东)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD83
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本文编号：2292282
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