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致密岩石自发渗吸特性实验研究
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致密岩石自发渗吸特性实验研究
Advances in Geo-Energy Research, 2018, 2(3): 292-304原文网址：http://www.astp-agr.com/index.php/Index/Index/detail?id=73
多级水力压裂技术是致密油气储层开发过程中的一种重要方法，压裂后形成裂缝与基质共存的复杂系统。现场生产发现较长时间的闷井可以提高油气采收率，这一原因被认为是致密油气层的自发渗吸作用引起。致密油气储层物性复杂，孔隙连通性差，因此本文以致密岩石为研究对象，通过开展一系列自发渗吸实验，研究致密岩石的渗吸特性，揭示气水和油水系统中油气的采收机制。
结果表明，裂缝可以增加致密岩心的自发渗吸体积，页岩中的膨胀土矿物会增强渗吸能力，高渗透率的致密岩心可能由于低毛管力的作用而导致采收率有所降低。
Experimental study on spontaneous imbibition chatacteristics of tight rocks
Linhu Gao, Zhengming Yang, Yue Shi
(Published: 2018-07-11)
CorrespondingAuthor and Email:Linhu Gao, gaolh2016@outlook.com
Citation: Gao, L., Yang, Z., Shi, Y. Experimental study on spontaneous imbibition chatacteristics of tight rocks. Advances in Geo-Energy Research, 2018, 2(3): 292-304, doi: 10.26804/ager.2018.03.07.
ArticleType: Original article
Abstract：
In the exploitation of tight oil and gas reservoirs, multi-stage hydraulic fracturing technology is mainly used and a complex system of fractures and matrix is formed after fracturing. In the process of field production, it is reported that longer shut-in time results in good oil and gas production rate. The reason of this phenomenon is considered as the spontaneous imbibition of oil and gas driven by capillary force in reservoirs. Spontaneous imbibition is an important recovery mechanism in low permeability and tight reservoirs. The pore structure of tight rocks is very complex and the pore connectivity is poor. It is of great significance to study the imbibition mechanism of tight porous rocks. Through the combination of spontaneous imbibition experiments, this work studies the influencing factors and reveals the mechanism of the gas/oil recovery from tight reservoirs. The spontaneous imbibition experiments were carried on the gas/water system and the oil/water system. The swelling clay minerals in shales will enhance the imbibition. Cores with high permeability have small recovery, which may be due to the low capillary force in tight cores. Fractures can promote the imbibition volume of tight cores.
Keywords: Tight rocks, spontaneous imbibition, capillary pressure.
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