页岩气藏水力压裂渗吸机理数值模拟研究

发布时间：2018-03-26 05:08

本文选题：数值模拟　切入点：渗吸机理　出处：《西南石油大学学报(自然科学版)》2017年02期

【摘要】：针对页岩储层在水力压裂作业和生产中渗吸机理及作用规律不清的问题,开展了渗吸机理及其引起的地层伤害评估的研究。建立了考虑不同影响因素的页岩水力压裂渗吸数学模型,包括基质和裂缝流动,气体扩散和解吸,应力敏感效应和毛细管压力,然后,讨论了在压裂气藏和后续生产期间如何通过量化裂缝面表皮演变来评估由于渗吸机制导致的储层伤害现象。结果表明,(1)在试井以及生产阶段渗吸对储层特性有较大影响,极大的毛细管压力是导致渗吸现象和水力裂缝附近水封的主要原因;(2)对于实施了水力压裂增产措施的新井通过探测裂缝压力可以获得原始气体压力;(3)润湿相阻塞导致的储层伤害是影响致密气藏水力压裂井生产能力的主要来源之一。研究结果对于页岩气藏的渗流特性能够提供深刻的理解,尤其是为早期生产阶段降低由渗吸作用可能造成的储层伤害来优化生产提供理论依据。
[Abstract]:Aiming at the problem of unclear permeability mechanism and action law of shale reservoir in hydraulic fracturing operation and production, The permeability mechanism and formation damage assessment were studied. A mathematical model of shale hydraulic fracturing infiltration was established, including matrix and fracture flow, gas diffusion and desorption. Stress sensitivity and capillary pressure, then, This paper discusses how to evaluate reservoir damage caused by permeability mechanism by quantifying fracture surface evolution during fracturing gas reservoir and subsequent production. The results show that permeability suction has great influence on reservoir characteristics in well test and production stage. Great capillary pressure is the main cause of permeability and water seal near hydraulic fracture. For new wells with hydraulic fracturing and increasing production, the original gas pressure can be obtained by detecting fracture pressure. The resulting reservoir damage is one of the main sources that affect the production capacity of hydraulic fracturing wells in dense gas reservoirs. The results of the study can provide a profound understanding of the percolation characteristics of shale gas reservoirs. In particular, it provides theoretical basis for optimizing production by reducing reservoir damage caused by permeability and suction in early production stage.
【作者单位】：中国石油勘探开发研究院;保利协鑫石油天然气集团控股有限公司;
【分类号】：TE377

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