IMECH-IR  > 流固耦合系统力学重点实验室
Experimental and numerical study on the relationship between water imbibition and salt ion diffusion in fractured shale reservoirs
Yang L(杨柳); Ge HK; Shi X; Li J; Zhou T; Cao WK; Zhang KH; Zhang YJ; Gao M; Yang, L (reprint author), China Univ Petr, State Key Lab Petr Resources & Prospecting, Beijing 102249, Peoples R China.; Shi, X (reprint author), China Univ Petr East China, Sch Petr Engn, Qingdao 266580, Peoples R China.
Source PublicationJOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
2017
Volume38Pages:283-297
ISSN1875-5100
Abstract

Field observations demonstrate that shale gas wells feature a low flowback efficiency (<30%) and high salinity flowback water (approximately 200kppm) after multistage hydraulic fracturing operations. The water recovery and salinity profile could be regarded as a critical method for volumetric and chemical analyses to characterize the reservoir properties and complexity of the fractured network. This paper aims to understand the relationship between fracturing imbibition and ion diffusion, which are responsible for inefficient water recovery and high-salinity flowback fluid, respectively. Comparative imbibition experiments are performed on different shale and sandstone samples, and an electrical conductivity meter is used to monitor the change in ion concentration change of the imbibition fluid. A mathematical model based on theoretical analysis is proposed to clarify the correlation between imbibition and ion diffusion. Both the experimental and analytical solution results show that the imbibition fluid conductivity resulting from ion diffusion is proportional to the square root of time, which is similar to the law of capillary-driven imbibition into porous media. Water imbibition into gas shale and ion diffusion into water proceed simultaneously in the opposite direction, and only the imbibition front contacting the pore wall with salt ions can cause the salt ions to dissolve and diffuse into water. The analytical solution results also indicate that the effects of the porosity, surface tension, contacting area and wetting angle on the water imbibition rate are in consistent with that of the ion diffusion rate. The permeability, however, shows a positive correlation with the imbibition rate and a negative correlation with the ion diffusion rate. The initial water saturation is negatively related to the imbibition rate, and positively related to the ion diffusion rate. In addition, smectite and I/S could enhance the imbibition and diffusion rates. It is observed that Mite concentration has no relationship with the imbibition and diffusion rates, indicating that illite minerals do not significantly affect the imbibition/diffusion rate in these clay-rich shales. This research contributes to understanding the correlation between imbibition and ion diffusion, which is significant for flow-back analysis after fracturing operations. (C) 2016 Elsevier B.V. All rights reserved.

DOI10.1016/j.jngse.2016.12.010
URL查看原文
Indexed BySCI ; EI
Language英语
WOS IDWOS:000394062000024
WOS KeywordImbibition ; Ion diffusion ; Shale ; Capillary pressure ; Fracturing
WOS Research AreaEnergy & Fuels ; Engineering
WOS SubjectEnergy & Fuels ; Engineering, Chemical
Funding OrganizationThe financial support of our shale research program is from the Foundation of Shale Oil and Gas Enrichment Mechanisms and Effective Development granted No. G5800-15-ZS-WX047, project funded by China Postdoctoral Science Foundation (granted No. 2016M601141), the Sinopec Group Basic Research Project granted No. P15026, the National Basic Research Program of China (973 Program) granted No.2015CB250903, the Major Program of the National Natural Science Foundation of China granted No. 51490652 and the National Science and Technology Major Project of the Ministry of Science and Technology of China granted No. 2016ZX05046-003.
Classification二类
Ranking1
Citation statistics
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/60094
Collection流固耦合系统力学重点实验室
Corresponding AuthorYang, L (reprint author), China Univ Petr, State Key Lab Petr Resources & Prospecting, Beijing 102249, Peoples R China.; Shi, X (reprint author), China Univ Petr East China, Sch Petr Engn, Qingdao 266580, Peoples R China.
Recommended Citation
GB/T 7714
Yang L,Ge HK,Shi X,et al. Experimental and numerical study on the relationship between water imbibition and salt ion diffusion in fractured shale reservoirs[J]. JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING,2017,38:283-297.
APA 杨柳.,Ge HK.,Shi X.,Li J.,Zhou T.,...&Shi, X .(2017).Experimental and numerical study on the relationship between water imbibition and salt ion diffusion in fractured shale reservoirs.JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING,38,283-297.
MLA 杨柳,et al."Experimental and numerical study on the relationship between water imbibition and salt ion diffusion in fractured shale reservoirs".JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING 38(2017):283-297.
Files in This Item: Download All
File Name/Size DocType Version Access License
IMCAS-J2017-004.pdf(2519KB)期刊论文作者接受稿开放获取CC BY-NC-SAView Download
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[杨柳]'s Articles
[Ge HK]'s Articles
[Shi X]'s Articles
Baidu academic
Similar articles in Baidu academic
[杨柳]'s Articles
[Ge HK]'s Articles
[Shi X]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[杨柳]'s Articles
[Ge HK]'s Articles
[Shi X]'s Articles
Terms of Use
No data!
Social Bookmark/Share
File name: IMCAS-J2017-004.pdf
Format: Adobe PDF
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.