砾岩储层砾缘缝应力敏感性实验评价研究
投稿时间:2017-10-31  修订日期:2018-03-15  点此下载全文
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杨龙 中国石油天然气股份有限公司新疆油田分公司实验检测研究院 89068654@qq.com 
吕道平 中国石油天然气股份有限公司新疆油田分公司实验检测研究院  
寇根 中国石油天然气股份有限公司新疆油田分公司实验检测研究院  
王子强 中国石油天然气股份有限公司新疆油田分公司实验检测研究院  
刘同敬 中国石油大学(北京)  
侯刚刚 中国石油大学(北京)  
基金项目:北京市自然科学“基于数字岩心的数字渗流基础探索研究”(编号:2173061)联合资助
中文摘要:砾岩油藏储层砾石含量高,具有复模态和拟双重孔隙结构特征,在开发监测和水驱开发过程中,显示出明显的非线性渗流特征,初步研究认为,砾缘缝的存在是导致这一规律的主要原因。本文设计并制作了一维和三维典型砾岩物理模型,开展了多级流量水驱实验,通过与砂岩岩心对比评价,验证了砾缘缝的存在是导致砾岩应力敏感非线性渗流的主控因素,当压力梯度和注入速度达到特定值时具有明显作用;且当物理模型几何形状具有层状特征时,多向受力不均匀是砾缘缝张开的另一必要条件。实验结果很好的解释了现场开发过程中非线性渗流的显示时机,揭示了层状砾岩中该现象普遍存在的油藏地质和渗流力学基础,为砾岩二次、三次采油优化设计提供科学指导和理论依据。
中文关键词:砾岩  应力敏感  实验  岩心  实验分析
 
Experimental Study on Stress Sensitivities of Conglomerate Reservoirs
Abstract:According to the analysis of static geological, dynamic development performance and pressure test data of conglomerate reservoirs in Xinjiang Oilfield, stress sensitivity is very obviously in waterflooding process which is with the water injection rate increasing to a certain point, water pressure doesn’t rise or rise not obviously. In view of this phenomenon, the physical models were designed, using different gravel sizes make 3D and 1D conglomerate cores. Waterflooding, oil displaces water and water displaces oil stages had made that the influence of existing of gravel seam margin. The results showed that due to the boundary pressure, gravel edges seam could not be open the 1D gravel core; however, 3D conglomerate core with the increase of water rate, injection pressure rose nonlinearly, and pressure rose slower after the injection rate rose to 4-5 ml/min. This is caused by gravel edge seem open and the same interpretation can be found in well testing. It provides a scientific fundamental for optimizing the parameters in waterflooding and polymer flooding of conglomerate reservoirs.
keywords:Conglomerate  stress sensitivity  experiment  conglomerate core  experimental analysis
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