滑脱和应力敏感效应对页岩气开发动态影响的数值模拟研究

发布时间：2018-03-22 13:13

本文选题：页岩气　切入点：滑脱效应　出处：《石油钻探技术》2017年01期 　论文类型：期刊论文

【摘要】：滑脱和应力敏感效应是影响页岩气藏开发动态的2个重要因素,为定量研究其对产气量的影响,运用等效孔隙介质模型,建立了同时考虑滑脱和应力敏感效应的页岩气藏两相渗流数学模型,采用有限差分方法对该模型进行了数值求解,用Fortran语言开发了页岩气藏数值模拟器,在定产量和定压衰竭式开采条件下应用该模拟器研究了滑脱与应力敏感效应对页岩气井产能的影响规律,并将计算结果与美国Haynesville页岩气藏W3井的实际生产数据进行了对比。结果表明:衰竭式开发导致页岩气藏的压力和渗透率均降低,生产井附近储层压力和渗透率急剧降低;在投产第1年内,产气量虽迅速下降,但滑脱和应力敏感效应对产气量影响较小;生产500d后,滑脱和应力敏感效应对产气量产生明显影响,滑脱效应使产气量增加,应力敏感导致产气量降低;模拟结果与生产数据的衰减趋势吻合度较高,证明该页岩气藏数值模拟器计算结果具有较高的可靠性。页岩气藏开发数值模拟器的成功研制,为页岩气井产能预测提供了一种新的有效手段。
[Abstract]:Slippage and stress sensitivity are two important factors influencing shale gas reservoir development performance. In order to quantitatively study its influence on gas production, an equivalent pore medium model is used. A mathematical model of shale gas reservoir two-phase percolation considering slippage and stress-sensitive effect is established. The numerical model is solved numerically by using finite difference method, and the shale gas reservoir numerical simulator is developed by Fortran language. The effects of slippage and stress sensitivity on the productivity of shale gas wells are studied by using the simulator under the condition of constant output and constant pressure depletion. The calculated results are compared with the actual production data of well W3 in Haynesville shale gas reservoir in the United States. The results show that the pressure and permeability of shale gas reservoir are both reduced and the reservoir pressure and permeability are reduced sharply in the vicinity of production wells. In the first year of production, gas production decreased rapidly, but slippage and stress sensitivity effects had little effect on gas production, and after 500 days of production, slippage and stress sensitivity effects had obvious effects on gas production, and slippage effect increased gas production. The stress sensitivity leads to the decrease of gas production, and the simulation results are in good agreement with the attenuation trend of the production data, which proves that the numerical simulation results of the shale gas reservoir are highly reliable, and the numerical simulator for the development of the shale gas reservoir is developed successfully. It provides a new effective method for predicting shale gas well productivity.
【作者单位】：中国地质大学(北京)能源学院;濮阳佰斯泰油气技术服务有限公司;非常规天然气能源地质评价与开发工程北京市重点实验室(中国地质大学(北京));
【基金】：国家重大科技专项“大型油气田及煤层气开发”之课题“新一代油藏数值模拟软件”(编号:2011ZX05009-006) 中央高校基本科研业务费专项资金(编号:2652015142)联合资助
【分类号】：TE332

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