注水工艺对海域咸水层二氧化碳封存能力的影响  

The impact of water injection simulation on CO_(2)storage capacity in offshore saline aquifers

作　　者：杨浦 方小宇 王子雯 黄仕锐 吕言新 杨博[6] YANG Pu;FANG Xiaoyu;WANG Ziwen;HUANG Shirui;LYU Yanxin;YANG Bo(Southern Marine Science and Engineering Guangdong Laboratory(Zhanjiang),Zhanjiang 524057,China;Qingdao Key Laboratory of Offshore CO_(2) Geological Storage,Qingdao 266237,China;Qingdao Engineering Research Center of Offshore CO_(2) Geological Storage,Qingdao 266237,China;Shandong Engineering Research Center of Offshore CO_(2) Geological Storage,Qingdao 266237,China;Marine Geological Institute of Hainan Province,Hainan Geological Bureau,Haikou 570000,China;College of Mechatronic Engineering,Southwest Petroleum University,Chengdu 610500,China)

机构地区：[1]南方海洋科学与工程广东省实验室(湛江),湛江524000 [2]青岛市海洋地质碳封存重点实验室,青岛266237 [3]青岛市海洋地质碳封存工程研究中心,青岛266237 [4]海洋地质碳封存山东省工程研究中心,青岛266237 [5]海南省海洋地质调查研究院,海口570000 [6]西南石油大学机电工程学院,成都610500

出　　处：《海洋地质前沿》2025年第3期99-106,共8页Marine Geology Frontiers

基　　金：湛江市科技计划项目“粤西近海盆地规模化CO_(2)封存场址优选及工程规划方案研究”(2022A01061);海南省重点研发项目“琼东南盆地天然气水合物资源评价与目标优选”(ZDYF2023GXJS008)。

摘　　要：连续或交替向咸水层注水能够加速CO_(2)溶解并提高CO_(2)咸水层封存安全性,同时也会干扰CO_(2)羽流空间发展从而间接影响地层实际封存能力,目前,工程方案对此问题的考虑还较少。本文模拟了开放式咸水层单井注气作业条件下,多种注水方案以及关键工艺参数对封存安全性和地层实际封存能力的影响。结果表明,注气开始后一段时间内通过在注气井段上方持续注水能够显著提高CO_(2)封存强度,增加地层实际封存能力,开始注水时刻越晚,封存强度提升作用越小;同步注水速率越大,实际封存能力提升越明显;停止注气后继续延长注水时间对实际封存能力的影响需要结合实际工况讨论;在注水总量一定的前提下,注气阶段高速率注水比低速率延长时间注水对实际封存能力的提升效果更好;随着注水层位与底部注气层位间距的减小,注水对实际封存能力的提升作用增强;注水还能够有效降低注入井附近地层中CO_(2)的饱和度,有利于降低井筒泄露风险。Continuous or alternating water injection into saline aquifers can accelerate CO_(2)dissolution and increase the safety of CO_(2)storage.However,the hydrodynamic effect may interfere with the development of CO_(2)plumes,affecting indirectly the actual storage capacity of the aquifer,to which available engineering solution remain very limited.We studied the potential water injection strategies and the influence of key operational parameters on the storage safety and capacity during CO_(2)injection using a single well in an open saline aquifer.Results show that continuous water injection above the gas injection layer after a certain period could enhance significantly the storage intensity and increase the capacity.The early the water injection starts,the better the results.The storage capacity increases with the increase in water injection rate during gas injection.The temporal effect of water injection post gas injection on storage capacity needs to be evaluated case by case.Under a given total water injection volume,high-rate water injection during gas injection is more effective to enhance the storage capacity than low-rate and prolonged water injection.Reducing the spatial interval between the water injection layer and gas injection layer could enhance the actual storage capacity.Meanwhile,water injection could effectively reduce the CO_(2)saturation near the injection well,and mitigate the risk of wellbore leakage.

关 键 词：CO_(2)地质封存 注水工艺 封存能力 封存安全性 工艺参数 

分 类 号：P736[天文地球—海洋地质] TE53[天文地球—海洋科学]