Current research into the use of supercritical CO2 technology in shale gas exploitation  

作　　者：Wang Meng Huang Kai Xie Weidong Dai Xuguang 

机构地区：[1]School of Resources and Earth Science,China University of Mining&Technology,Xuzhou 221116,China [2]Key Laboratory of Coalbed Methane Resource&Reservoir Formation Process,Ministry of Education,China University of Mining&Technology,Xuzhou 221008,China [3]College of Geology and Mining Engineering,Xinjiang University,Urumqi 830046,China

出　　处：《International Journal of Mining Science and Technology》2019年第5期739-744,共6页矿业科学技术学报（英文版）

基　　金：the Foundation Research Project of Jiangsu province(Youth Fund Project)of China(No.BK20150179);the Fundamental Research Funds for the Central Universities(No.2015XKZD07)of China,and the Postdoctoral Science Foundation of Jiangsu Province.

摘　　要：The use of supercritical CO2 for shale gas extraction is a promising new technology.This paper explores current research into this process,looking at analysis of the mechanism of CH4 displacement in nanoporous shale,the positive and negative effects accompanying its use for sequestration as well as organic extraction,the migration of elements and the swelling process,and the macro and micro control mechanisms involved in permeability enhancement in reservoirs.Fruitful directions for future research are also considered through comparison with hydraulic fracturing.The research findings indicate that ScCO2 fluid replacement can be used to increase gas production and seal up greenhouse gases as an effective,clean and safe method of shale gas exploitation.It is particularly effective for promoting the desorption of CH4 in shale reservoirs that have developed fine neck-wide body pores,and the subtle structural changes effected by ScCO2 fluid in sensitive minerals in reservoirs with a high brittle mineral content also have a positive effect on permeability and storage capacity.The adsorption process has been characterized as consisting of three stages:short-term shrinkage,slow swelling,and stability;an expansion equation has been proposed for CO2/CH4 that incorporates competitive adsorption,collision desorption,and impingement re-adsorption.ScCO2 fracturing has been found to be more effective than hydraulic fracturing for dense reservoirs and more effective at linking up pore-micro-fissure-fracture systems.

关 键 词：SHALE gas SUPERCRITICAL CO2 ADSORPTION/DESORPTION Physical properties GEOLOGICAL SEQUESTRATION 

分 类 号：TE377[石油与天然气工程—油气田开发工程]