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Characteristics of imbibition in tight oil reservoirs from the perspective of physical experiments and theory
Energy Science & Engineering ( IF 3.5 ) Pub Date : 2020-06-03 , DOI: 10.1002/ese3.762 Renyi Cao 1 , Zhiyu Wu 2 , Xiaowei Liang 2 , Linsong Cheng 1 , Zhongyi Xu 1, 3 , Yun Guan 1 , Zhuoliang Guo 1 , Zhihao Jia 1
Energy Science & Engineering ( IF 3.5 ) Pub Date : 2020-06-03 , DOI: 10.1002/ese3.762 Renyi Cao 1 , Zhiyu Wu 2 , Xiaowei Liang 2 , Linsong Cheng 1 , Zhongyi Xu 1, 3 , Yun Guan 1 , Zhuoliang Guo 1 , Zhihao Jia 1
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Imbibition is an important recovery mechanism for tight oil reservoirs, which occurs during hydraulic fracturing and development. Due to the massive distribution of micro‐nano scale pore throats and the existence of a boundary layer in tight formation, agreement consensus has not been reached on the imbibition mechanism. Based on the effect of the boundary layer, experiments were conducted to study the imbibition in tight sandstone, and NMR was used to determine the efficiency of imbibition. The results reveal that the imbibition rate is related to the connection area of the matrix‐fracture, throat connection, and radius. Then, the effective capillary pressure was modified by describing the thickness of the boundary layer in the micro‐nano pore throats. The calculation results show that the existence of boundary layer in micro‐nano throats makes the capillary pressure much larger than those of reservoirs without boundary layer. And the boundary layer reduces the effective flow radius, which dramatically decreases the imbibition quantity. The final result of existence of a boundary layer dramatically weakens the imbibition ability of a tight oil reservoir, and thus, the existence of a boundary layer cannot be ignored. Finally, the effective throat radius limit was analyzed during imbibition in a water‐oil‐rock system of a tight oil reservoir. Without a boundary layer, the effective radius of the pore throats in the water‐oil‐rock system during imbibition is greater than 200 nm, which is due to the advantages of the large capillary force and pore throats that are not too small. With a boundary layer, the main radius of the pore throats used for the water‐oil‐rock imbibition is approximately 400 nm. Thus, the imbibition occurs in the pore throats larger than 200 nm in the water‐oil‐rock system, and a surfactant could reduce the limit of the throat radius during imbibition in tight oil reservoirs.
中文翻译：
物理实验和理论视角下的致密油储层吸水特征
渗入是致密油藏的重要恢复机制，其发生在水力压裂和开发过程中。由于微纳米级孔喉的大量分布和边界层的紧密形成，在吸水机理上尚未达成共识。根据边界层的影响，进行了实验研究致密砂岩中的吸水率，并利用核磁共振技术确定了吸水率。结果表明，吸水率与基质裂缝的连接面积，喉管的连接和半径有关。然后，通过描述微纳孔喉中边界层的厚度来修改有效毛细管压力。计算结果表明，微纳喉中存在边界层，使毛细管压力比没有边界层的储层的毛细管压力大得多。边界层减小了有效流半径，从而大大减少了吸水量。边界层存在的最终结果大大削弱了致密油藏的吸水能力，因此边界层的存在不可忽视。最后，在致密油藏的水-油-岩系统中的吸水过程中分析了有效喉部半径极限。在没有边界层的情况下，吸水过程中水-油-岩石系统中孔喉的有效半径大于200 nm，这是由于毛细作用力大且孔喉不太小所致。具有边界层，用于水-油-岩石吸收的孔喉的主半径约为400 nm。因此，在油-油-岩石系统中，吸收作用发生在大于200 nm的孔喉中，表面活性剂可以减少致密油藏在吸收过程中喉部半径的极限。
更新日期：2020-06-03
中文翻译：
物理实验和理论视角下的致密油储层吸水特征
渗入是致密油藏的重要恢复机制，其发生在水力压裂和开发过程中。由于微纳米级孔喉的大量分布和边界层的紧密形成，在吸水机理上尚未达成共识。根据边界层的影响，进行了实验研究致密砂岩中的吸水率，并利用核磁共振技术确定了吸水率。结果表明，吸水率与基质裂缝的连接面积，喉管的连接和半径有关。然后，通过描述微纳孔喉中边界层的厚度来修改有效毛细管压力。计算结果表明，微纳喉中存在边界层，使毛细管压力比没有边界层的储层的毛细管压力大得多。边界层减小了有效流半径，从而大大减少了吸水量。边界层存在的最终结果大大削弱了致密油藏的吸水能力，因此边界层的存在不可忽视。最后，在致密油藏的水-油-岩系统中的吸水过程中分析了有效喉部半径极限。在没有边界层的情况下，吸水过程中水-油-岩石系统中孔喉的有效半径大于200 nm，这是由于毛细作用力大且孔喉不太小所致。具有边界层，用于水-油-岩石吸收的孔喉的主半径约为400 nm。因此，在油-油-岩石系统中，吸收作用发生在大于200 nm的孔喉中，表面活性剂可以减少致密油藏在吸收过程中喉部半径的极限。
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