温度压力对岩心尺度CO_(2)–水–岩系统中残余水影响的实验研究  

Experimental Study on the Effects of Temperature and Pressure on Residual Water in the CO_(2)-HO_(2)-Rock System of Core-Scale

作　　者：索瑞厅 李旭峰[2] 高鹏宇 李铱 于青春[4] SUO Ruiting;LI Xufeng;GAO Pengyu;LI Yi;YU Qingchun(School of Ecology and Environment,Inner Mongolia University,Hohhot 010021,Inner Mongolia Autonomous Region,China;Key Laboratory of CO2 Geological Storage of China Geological Survey(Center of Hydrogeology and Environmental Geology China Geological Survey),Baoding 071051,Hebei Province,China;School of Civil Engineering,Tianjin University,Jinnan District,Tianjin 300350,China;School of Water Resources and Environment,China University of Geosciences(Beijing),Haidian District,Beijing 100083,China)

机构地区：[1]内蒙古大学生态与环境学院,内蒙古自治区呼和浩特市010021 [2]中国地质调查局二氧化碳地质储存重点实验室(中国地质调查局水文地质环境地质调查中心),河北省保定市071051 [3]天津大学建筑工程学院,天津市津南区300350 [4]中国地质大学(北京)水资源与环境学院,北京市海淀区100083

出　　处：《中国电机工程学报》2021年第11期3711-3721,共11页Proceedings of the CSEE

基　　金：国家自然科学基金(41702251);内蒙古自然科学基金(2019MS04018);江苏省煤基温室气体减排与资源化利用重点实验室创新项目(2019B005)。

摘　　要：在深部咸水层中进行CO_(2)地质储存,主要排水过程中形成的残余水对地质储层的容量和安全性都有负面影响。本研究通过超临界CO_(2)排驱饱水岩心实验,研究了不同温度(40、50和60℃)、不同压力(8、10和12MPa)对CO_(2)–水–岩系统中残余水的影响及作用机制。实验结果表明:超临界CO_(2)排驱去离子水的残余水饱和度为S_(w40℃)<S_(w50℃)<S_(w60℃)和S_(w8MPa)>S_(w10MPa)>S_(w12MPa)。分析发现,残余水饱和度的差异归因于温度压力导致CO_(2)-H_(2)O系统间界面张力变化,且压力对其影响较大;另外,较小的黏度比和较大的密度差会使残余水饱和度增大。低温高压储层具有较好的储气效果,亦可选择低盐度的储层或是注入高密度CO_(2)来降低残余水饱和度,使得毛细残余储存量增加。Residual water formed during the drainage process of CO_(2) geological storage carried out in deep saline aquifers has negative impacts on the capacity and safety of geological reservoir.The influence of different temperature (40,50 and 60℃) and pressure (8,10 and 12MPa) on residual water in CO_(2)-H2O-rock system and its mechanism were studied through supercritical CO_(2) flooding experiments.The experimental results show that the residual water saturation of deionized water in drainage experiments is S_(w40℃)<S_(w50℃)<S_(w60℃) and S_(w8MPa)>S_(w10MPa)>S_(w12MPa).Based on the analysis,we found that the difference is due to the change of interfacial tension between CO_(2)-H_(2)O system caused by temperature and pressure,and the pressure has a greater influence.In addition,smaller viscosity ratio and larger density difference can increase the residual water saturation.Low temperature and high pressure reservoir have better storage capacity.We can also choose reservoirs with low salinity or inject CO_(2) with high density to reduce residual water saturation and increase the capacity of capillary residual storage.

关 键 词：CO_(2)地质储存 毛细残余储存 残余水饱和度 温度和压力 

分 类 号：P641[天文地球—地质矿产勘探] P66[天文地球—地质学]