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Effects of Fracture Characteristics on Spontaneous Imbibition in a Tight Reservoir
Energy & Fuels ( IF 5.2 ) Pub Date : 2021-09-17 , DOI: 10.1021/acs.energyfuels.1c01831 Liu Yang 1, 2 , Hengkai Wang 1 , Zhengyin Zou 3 , Qingping Jiang 3 , Jigang Zhang 3 , Jianchun Xu 2 , Jianchao Cai 4
Energy & Fuels ( IF 5.2 ) Pub Date : 2021-09-17 , DOI: 10.1021/acs.energyfuels.1c01831 Liu Yang 1, 2 , Hengkai Wang 1 , Zhengyin Zou 3 , Qingping Jiang 3 , Jigang Zhang 3 , Jianchun Xu 2 , Jianchao Cai 4
Affiliation
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Horizontal well fracturing technology is widely used in the development of shale gas resources. After the fracturing operations, natural and artificial fractures exist in the reservoir at the same time, which has significant effects on spontaneous imbibition to increase shale gas production. Based on nuclear magnetic resonance technology, this work studies the spontaneous imbibition property of fractured shale, including artificial and natural fractures, surface cemented minerals, boundary conditions, etc. The results show that the relaxation time spectra reflect the characteristics of water and gas migration in the rock pore space. The micropores and the small pores are the main storage space for water in shale. After water imbibition starts, the imbibition volume is roughly proportional to the square root of time. Through the comparative experiments on artificial fractures, natural fractures, and seamless cores, it is found that the existence of fractures can significantly promote water imbibition, and the imbibition speed of artificial fractured cores is faster than those of others. Because of the existence of artificial and natural fractures, the number of pores for gas discharge increases, and the imbibed volume is slightly more. When the cemented minerals such as quartzite and calcite are attached to the core surface, they have poor water sensitivity and block some of the pores, thus resulting in a slower imbibition speed. Different boundary conditions will not only affect the contact area between the core and water but also influence the types of imbibition, which changes the water flow path and imbibition speed. This study provides an important insight into spontaneous imbibition in gas shale after the fracturing operations.
中文翻译：
裂缝特征对致密油藏自吸的影响
水平井压裂技术在页岩气资源开发中应用广泛。压裂作业后，储层内同时存在天然裂缝和人工裂缝，对自吸增加页岩气产量有显着影响。本工作基于核磁共振技术，研究了裂缝性页岩的自吸特性，包括人工和天然裂缝、地表胶结矿物、边界条件等，结果表明弛豫时间谱反映了页岩中水气运移特征。岩石孔隙空间。微孔和小孔是页岩中水的主要储存空间。吸水开始后，吸水量大致与时间的平方根成正比。通过人工裂缝、天然裂缝和无缝岩心的对比实验发现，裂缝的存在可以显着促进吸水，并且人工裂缝岩心的吸水速度比其他岩心快。由于人工和天然裂缝的存在，泄气孔数增多，吸纳量略多。当石英岩、方解石等胶结矿物附着在岩心表面时，水敏性差，堵塞了部分孔隙，导致吸水速度变慢。不同的边界条件不仅会影响岩心与水的接触面积，还会影响渗吸类型，从而改变水流路径和渗吸速度。
更新日期：2021-10-07
中文翻译：
裂缝特征对致密油藏自吸的影响
水平井压裂技术在页岩气资源开发中应用广泛。压裂作业后，储层内同时存在天然裂缝和人工裂缝，对自吸增加页岩气产量有显着影响。本工作基于核磁共振技术，研究了裂缝性页岩的自吸特性，包括人工和天然裂缝、地表胶结矿物、边界条件等，结果表明弛豫时间谱反映了页岩中水气运移特征。岩石孔隙空间。微孔和小孔是页岩中水的主要储存空间。吸水开始后，吸水量大致与时间的平方根成正比。通过人工裂缝、天然裂缝和无缝岩心的对比实验发现，裂缝的存在可以显着促进吸水，并且人工裂缝岩心的吸水速度比其他岩心快。由于人工和天然裂缝的存在，泄气孔数增多，吸纳量略多。当石英岩、方解石等胶结矿物附着在岩心表面时，水敏性差，堵塞了部分孔隙，导致吸水速度变慢。不同的边界条件不仅会影响岩心与水的接触面积，还会影响渗吸类型，从而改变水流路径和渗吸速度。
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