储层流体非均质性对加拿大油砂热采的影响

发布时间：2019-04-24 03:31

【摘要】：加拿大是世界上油砂资源最为丰富的国家,其中约80%的资源需要通过热采方式采出,目前应用比较广泛的热采技术包括蒸汽辅助重力泄油和蒸汽吞吐等。油砂热采的油藏模拟结果与生产历史难以拟合是面临的主要难题之一。分析发现,西加拿大沉积盆地范围内原油物性在横向和垂向上变化较大,油藏底部和顶部原油物性完全不同。重点对原油粘度垂向梯度变化对热采开发效果的影响进行油藏模拟研究,发现粘度梯度变化是造成油藏模拟结果与生产历史难以拟合的主要原因,采用变粘度模型模拟的累积产油量与实际生产数据吻合较好,采用定粘度模型的模拟结果偏高。利用变粘度模型对研究区的生产井位置优化结果显示,将蒸汽辅助重力泄油生产井部署在油水界面之上8 m处油层的动用程度和经济效益最大。将储层流体非均质性(特别是粘度非均质性)与储层岩石非均质性相结合,并应用于油藏描述和数值模拟中,能够准确预测油砂热采的生产动态及开发效果,优化生产管理,确保采收率和经济效益的最优化。
[Abstract]:Canada is one of the most abundant oil sands in the world. About 80% of the resources need to be extracted by thermal recovery. At present, the widely used thermal recovery techniques include steam assisted gravity oil discharge and steam huff and puff, etc. It is one of the main difficult problems to fit the simulation results and production history of oil sand thermal recovery. It is found that the physical properties of crude oil vary greatly in lateral and vertical direction in the western Canadian sedimentary basin, and the physical properties of crude oil in the bottom and top of the reservoir are completely different. It is found that the variation of viscosity gradient is the main reason that it is difficult to fit the simulation results and production history of crude oil due to the influence of the vertical gradient change of crude oil viscosity on the thermal recovery and development effect. The cumulative oil production simulated by the variable viscosity model is in good agreement with the actual production data, and the simulation results with the constant viscosity model are relatively high. Using the variable viscosity model to optimize the location of production wells in the study area, it is shown that the production degree and economic benefit of the production wells with steam-assisted gravity drainage at 8 m above the oil-water interface are the greatest. Combining reservoir fluid heterogeneity (especially viscosity heterogeneity) with reservoir rock heterogeneity and applying it to reservoir description and numerical simulation can accurately predict production performance and development effect of thermal recovery of oil sand and optimize production management. Ensure the optimization of oil recovery and economic benefits.
【作者单位】：中国地质大学(北京)地球科学与资源学院;中国地质调查局油气资源调查中心;中国石化石油勘探开发研究院;卡尔加里大学地球科学学院;
【基金】：国家科技支撑计划“非常规油气评价技术及装备研究”(2006BAB03B08)
【分类号】：TE357.44

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