基于热裂缝的注水井吸水能力模拟研究
发布时间：2019-05-06 13:45
【摘要】：注水开发是成熟油田保持地层压力所采用的主要开采方式,而注水井吸水能力的变化对油田经济、有效地开发有着至关重要的影响,因此针对注水井的吸水能力进行有效预测成为相关专家和学者日益关心的问题。相关研究表明,对于海上注水开发油田,注入水与油层温差产生的热诱导裂缝对注水井吸水能力变化存在不容忽视的影响,因此将热诱导裂缝存在因素纳入注水井吸水能力研究,对于油田精确掌握注水动态有着重要意义。 热诱导裂缝是指油田注水工程中,低温注入水注入到高温储层后,近井地带的温度场与孔隙压力场随之发生变化,造成岩石应力场改变而形成的诱导微裂缝,这种现象在采用海水进行开采的海上油田普遍存在。产生的大量热裂缝增加了注入水进入储层的滤失面积,同时为悬浮颗粒提供了更多沉降、运移的壁面环境,有效缓解了注入水对储层的污染程度。热裂缝现象的存在可以有效提高注水层位对较低品质注入水的容忍程度,这对于油田注入水水质指标优化决策无疑具有指导意义。 在大量调研国内外文献的基础上,针对海上油田海水回注现状,系统调研了常规注水井吸水能力评价模型,并针对热诱导裂缝存在条件下注水井吸水能力变化规律提出模拟思路；根据热诱导裂缝形成及扩展机理,建立了注水冷却区域热诱导裂缝扩展模型；深入研究悬浮颗粒运移堵塞机理并建立了滤饼区域压降模型,并通过模型耦合建立了基于热诱导裂缝的注水井吸水能力预测模型。模型求解过程中,引入了温度场计算模型,实现了任意时刻下温差数值的精确求解。通过使用该模型对影响因素进行单因素和多因素综合分析,得到了各因素对注水井吸水能力的影响程度,并结合x油田实际注水特征,进行吸水能力预测对比,验证了模型的可靠性,完善了海上油田注水井吸水能力预测理论,并对海上油田现场精确掌握注水井吸水能力变化具有一定的参考价值。
[Abstract]:Water injection development is the main way to maintain formation pressure in mature oilfields, and the change of water absorption capacity of injection wells has a vital impact on the economic and effective development of oil fields. Therefore, it is an increasingly concerned problem for experts and scholars to predict the water absorption capacity of water injection wells effectively. The related research shows that the thermal induced fractures produced by the temperature difference between injected water and oil layer have an important influence on the change of water absorption capacity of water injection wells for offshore waterflooding oilfield. Therefore, it is of great significance to integrate the existing factors of thermal induced fractures into the study of water absorption ability of injection wells for accurately mastering the water injection performance in oil fields. Thermal induced fracture (TIC) is a kind of induced microfracture which is caused by the change of temperature field and pore pressure field in near-well zone after injection of low-temperature injected water into high-temperature reservoir in oilfield water injection engineering, which results in the change of rock stress field. This phenomenon is common in offshore oilfields where seawater is used for exploitation. A large number of thermal fractures produced increased the filtration area of injected water into the reservoir, and provided more settlement and migration environment for suspended particles, which effectively alleviated the pollution degree of injected water to the reservoir. The existence of thermal fracture phenomenon can effectively improve the tolerance of water injection layer to low quality injected water, which is undoubtedly of guiding significance for optimizing the water quality index of injected water in oil field. On the basis of a large number of domestic and foreign literatures, according to the current situation of seawater reinjection in offshore oil fields, the evaluation model of water absorption capacity of conventional injection wells is systematically investigated. According to the variation rule of water absorption capacity of water injection well under the condition of thermal induced fracture, the simulation idea is put forward. According to the formation and propagation mechanism of thermal induced fractures, a model of thermal induced fracture propagation in water injection cooling region is established. The mechanism of suspended particle migration and blockage is deeply studied and the model of filter cake regional pressure drop is established. The prediction model of water absorption capacity of water injection wells based on thermal induced fractures is established by coupling the model. In the process of solving the model, the temperature field calculation model is introduced, and the accurate solution of the temperature difference value at any time is realized. Through the comprehensive analysis of single factor and multi-factor by using the model, the influence degree of each factor on water absorption capacity of water injection well is obtained, and the prediction and comparison of water absorption capacity are carried out according to the actual water injection characteristics of oilfield x. The reliability of the model is verified and the prediction theory of water absorption capacity of water injection wells in offshore oilfields is improved. It is of certain reference value to accurately grasp the variation of water absorption capacity of water injection wells in offshore oilfields.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE357.6
本文编号：2470221
[Abstract]:Water injection development is the main way to maintain formation pressure in mature oilfields, and the change of water absorption capacity of injection wells has a vital impact on the economic and effective development of oil fields. Therefore, it is an increasingly concerned problem for experts and scholars to predict the water absorption capacity of water injection wells effectively. The related research shows that the thermal induced fractures produced by the temperature difference between injected water and oil layer have an important influence on the change of water absorption capacity of water injection wells for offshore waterflooding oilfield. Therefore, it is of great significance to integrate the existing factors of thermal induced fractures into the study of water absorption ability of injection wells for accurately mastering the water injection performance in oil fields. Thermal induced fracture (TIC) is a kind of induced microfracture which is caused by the change of temperature field and pore pressure field in near-well zone after injection of low-temperature injected water into high-temperature reservoir in oilfield water injection engineering, which results in the change of rock stress field. This phenomenon is common in offshore oilfields where seawater is used for exploitation. A large number of thermal fractures produced increased the filtration area of injected water into the reservoir, and provided more settlement and migration environment for suspended particles, which effectively alleviated the pollution degree of injected water to the reservoir. The existence of thermal fracture phenomenon can effectively improve the tolerance of water injection layer to low quality injected water, which is undoubtedly of guiding significance for optimizing the water quality index of injected water in oil field. On the basis of a large number of domestic and foreign literatures, according to the current situation of seawater reinjection in offshore oil fields, the evaluation model of water absorption capacity of conventional injection wells is systematically investigated. According to the variation rule of water absorption capacity of water injection well under the condition of thermal induced fracture, the simulation idea is put forward. According to the formation and propagation mechanism of thermal induced fractures, a model of thermal induced fracture propagation in water injection cooling region is established. The mechanism of suspended particle migration and blockage is deeply studied and the model of filter cake regional pressure drop is established. The prediction model of water absorption capacity of water injection wells based on thermal induced fractures is established by coupling the model. In the process of solving the model, the temperature field calculation model is introduced, and the accurate solution of the temperature difference value at any time is realized. Through the comprehensive analysis of single factor and multi-factor by using the model, the influence degree of each factor on water absorption capacity of water injection well is obtained, and the prediction and comparison of water absorption capacity are carried out according to the actual water injection characteristics of oilfield x. The reliability of the model is verified and the prediction theory of water absorption capacity of water injection wells in offshore oilfields is improved. It is of certain reference value to accurately grasp the variation of water absorption capacity of water injection wells in offshore oilfields.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE357.6
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