Analysis of Controlling Factors at Separate Imbibition Stages for Ultra-Low-Permeability Reservoirs

Spontaneous imbibition is an important mechanism in naturally fractured reservoirs. In our previous studies on the effect of imbibition efficiency of ultra-low permeability reservoirs, we mostly focused on the relationship between macroscopic core recovery rate and influential factors. Additionally,...

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Autores principales:	Hailong Dang, Hanqiao Jiang, Binchi Hou, Xiaofeng Wang, Tao Gao, Chengjun Wang, Chunhua Lu
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	ultra-low-permeability reservoirs imbibition process controlling factors importance weighting comparative analysis model analytic hierarchy process Technology T
Acceso en línea:	https://doaj.org/article/7c918aeb136d4b95990039708e6f5164
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spelling	oai:doaj.org-article:7c918aeb136d4b95990039708e6f51642021-11-11T15:53:38ZAnalysis of Controlling Factors at Separate Imbibition Stages for Ultra-Low-Permeability Reservoirs10.3390/en142170931996-1073https://doaj.org/article/7c918aeb136d4b95990039708e6f51642021-10-01T00:00:00Zhttps://www.mdpi.com/1996-1073/14/21/7093https://doaj.org/toc/1996-1073Spontaneous imbibition is an important mechanism in naturally fractured reservoirs. In our previous studies on the effect of imbibition efficiency of ultra-low permeability reservoirs, we mostly focused on the relationship between macroscopic core recovery rate and influential factors. Additionally, we also mainly focused on the factors that control the final imbibition recovery for ultra-low permeability reservoirs. Through a large number of experiments, it was found that the factors affecting imbibition are different in separate stages. However, the relative importance of those factors in different imbibition stages was hardly studied. In this work, we tested six key factors, i.e., the core length, RQI, salinity, interfacial characteristics, initial oil saturation, and oil viscosity, in natural sandstone samples from Chang 6 in the Zichang area. Based on experimental results, we divided the imbibition process into three stages (i.e., the early stage, the middle stage, and the late stage) to quantify the effects of the controlling factors. The results show that the relative importance of the controlling factors is changing during the imbibition process. The weight of importance is obtained for those factors at each stage. In addition, a comparative model is established for the dual-porosity media from Chang 6 formation. The results show that the increase of the rock size can extend the imbibition period for the early and middle stages. Moreover, the weight of importance for the initial oil saturation, interfacial characteristics, and salinity are also analyzed in three imbibition stages. This study provides theoretical support to guide water injection in ultra-low-permeability reservoirs and to understand the formation of energy supplements and oil recovery during the imbibition process.Hailong DangHanqiao JiangBinchi HouXiaofeng WangTao GaoChengjun WangChunhua LuMDPI AGarticleultra-low-permeability reservoirsimbibition processcontrolling factorsimportance weightingcomparative analysis modelanalytic hierarchy processTechnologyTENEnergies, Vol 14, Iss 7093, p 7093 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	ultra-low-permeability reservoirs imbibition process controlling factors importance weighting comparative analysis model analytic hierarchy process Technology T
spellingShingle	ultra-low-permeability reservoirs imbibition process controlling factors importance weighting comparative analysis model analytic hierarchy process Technology T Hailong Dang Hanqiao Jiang Binchi Hou Xiaofeng Wang Tao Gao Chengjun Wang Chunhua Lu Analysis of Controlling Factors at Separate Imbibition Stages for Ultra-Low-Permeability Reservoirs
description	Spontaneous imbibition is an important mechanism in naturally fractured reservoirs. In our previous studies on the effect of imbibition efficiency of ultra-low permeability reservoirs, we mostly focused on the relationship between macroscopic core recovery rate and influential factors. Additionally, we also mainly focused on the factors that control the final imbibition recovery for ultra-low permeability reservoirs. Through a large number of experiments, it was found that the factors affecting imbibition are different in separate stages. However, the relative importance of those factors in different imbibition stages was hardly studied. In this work, we tested six key factors, i.e., the core length, RQI, salinity, interfacial characteristics, initial oil saturation, and oil viscosity, in natural sandstone samples from Chang 6 in the Zichang area. Based on experimental results, we divided the imbibition process into three stages (i.e., the early stage, the middle stage, and the late stage) to quantify the effects of the controlling factors. The results show that the relative importance of the controlling factors is changing during the imbibition process. The weight of importance is obtained for those factors at each stage. In addition, a comparative model is established for the dual-porosity media from Chang 6 formation. The results show that the increase of the rock size can extend the imbibition period for the early and middle stages. Moreover, the weight of importance for the initial oil saturation, interfacial characteristics, and salinity are also analyzed in three imbibition stages. This study provides theoretical support to guide water injection in ultra-low-permeability reservoirs and to understand the formation of energy supplements and oil recovery during the imbibition process.
format	article
author	Hailong Dang Hanqiao Jiang Binchi Hou Xiaofeng Wang Tao Gao Chengjun Wang Chunhua Lu
author_facet	Hailong Dang Hanqiao Jiang Binchi Hou Xiaofeng Wang Tao Gao Chengjun Wang Chunhua Lu
author_sort	Hailong Dang
title	Analysis of Controlling Factors at Separate Imbibition Stages for Ultra-Low-Permeability Reservoirs
title_short	Analysis of Controlling Factors at Separate Imbibition Stages for Ultra-Low-Permeability Reservoirs
title_full	Analysis of Controlling Factors at Separate Imbibition Stages for Ultra-Low-Permeability Reservoirs
title_fullStr	Analysis of Controlling Factors at Separate Imbibition Stages for Ultra-Low-Permeability Reservoirs
title_full_unstemmed	Analysis of Controlling Factors at Separate Imbibition Stages for Ultra-Low-Permeability Reservoirs
title_sort	analysis of controlling factors at separate imbibition stages for ultra-low-permeability reservoirs
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/7c918aeb136d4b95990039708e6f5164
work_keys_str_mv	AT hailongdang analysisofcontrollingfactorsatseparateimbibitionstagesforultralowpermeabilityreservoirs AT hanqiaojiang analysisofcontrollingfactorsatseparateimbibitionstagesforultralowpermeabilityreservoirs AT binchihou analysisofcontrollingfactorsatseparateimbibitionstagesforultralowpermeabilityreservoirs AT xiaofengwang analysisofcontrollingfactorsatseparateimbibitionstagesforultralowpermeabilityreservoirs AT taogao analysisofcontrollingfactorsatseparateimbibitionstagesforultralowpermeabilityreservoirs AT chengjunwang analysisofcontrollingfactorsatseparateimbibitionstagesforultralowpermeabilityreservoirs AT chunhualu analysisofcontrollingfactorsatseparateimbibitionstagesforultralowpermeabilityreservoirs
_version_	1718432989985112064

Analysis of Controlling Factors at Separate Imbibition Stages for Ultra-Low-Permeability Reservoirs

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