稠油油藏SAGD开发后腔体储氢潜力数值模拟  

Numerical simulation of cavity hydrogen storage potential after SAGD development in heavy oil reservoirs

作　　者：于春生 彭良儒 蒋琪 蒲万芬 蒲军[3] 吴芳杰 YU Chunsheng;PENG Liangru;JIANG Qi;PU Wanfen;PU Jun;WU Fangjie(Petroleum Engineering School,Southwest Petroleum University,Chengdu,Sichuan 610500,China;Tianfu Yongxing Laboratory,Chengdu,Sichuan 610213,China;Sinopec Petroleum Exploration and Production Research Institute,Beijing 102200,China)

机构地区：[1]西南石油大学石油与天然气工程学院 [2]天府永兴实验室 [3]中国石化石油勘探开发研究院

出　　处：《天然气工业》2024年第8期178-190,共13页Natural Gas Industry

基　　金：四川省引智成果示范推广项目“油气藏地下原位制氢和温室气体封存利用技术”(编号:2022ZHYZ0007);四川省国际合作创新项目“玄武岩地层CO_(2)加速矿化封存机制与关键技术”(编号:2023YFH0005)。

摘　　要：氢气作为一种清洁能源有望替代化石燃料成为主要能源载体,地下储氢是实现氢气大容量长期存储的有效途径,是近年来新兴研究领域。为此,在目前盐穴、枯竭油气藏及含水层3种传统地下储氢地质体外,探索了一种新的储氢方法,即利用稠油油藏蒸汽辅助重力泄油(SAGD)后形成的腔体进行储氢。首先对比了稠油油藏SAGD开发后储层储氢与常规地层储氢的优缺点,进而采用数值模拟方法对其建立地下储氢库的可能性进行论证,最后明确了不同注采方案的氢气储量及回收率,揭示了储层注采氢气阶段氢气与地层原有气体的流动特征。研究结果表明:①相较于常规枯竭油气藏储氢库,利用稠油油藏SAGD开发后的枯竭腔储氢具有储气量大、氢—油过渡带导致的氢损更低、无需注入或仅需注入少量的垫气、可降低氢脆风险、可提前监测闭圈盖层稳定性及气体密封性等优点;②典型单井组SAGD开发后的枯竭腔可储存约490 t氢气,回收率约为90%,且随着注采周期增多,采出的氢气纯度越高,第4个采氢周期后氢气采出纯度高达99%;③氢气存储方式的差异会导致甲烷在枯竭腔中的聚集位置发生变化,长期存储方式在氢气注入结束后,甲烷主要聚集在枯竭腔的底部,而短期存储方式下甲烷只会被氢气挤压到枯竭腔顶部的左右两侧,导致产氢过程中甲烷的产出规律不同。结论认为,利用稠油油藏SAGD开发后的储层进行高纯氢气的储存在储氢量、氢气回采纯度和建库成本方面都具有显著优势,是一种解决大规模储氢的高经济效益储氢技术,该研究成果能够为中国地下储氢技术的选址和建设运行提供指导和参考。s:Hydrogen,as a kind of clean energy,is expected to replace fossil fuel to be the main energy carrier.Underground hydrogen storage is an effective way to store a large amount of hydrogen for a long time,as well as an emerging research filed field in recent years.In addition to the three kinds of traditional underground hydrogen storage geological bodies(salt cavern,depleted oil and gas reservoir and aquifer),a new hydrogen storage method is explored,which stores hydrogen storage in the cavity formed after steamassisted gravity drainage(SAGD)in heavy oil reservoirs.Firstly,the advantages and disadvantages of the hydrogen storage in the reservoirs after the development of heavy oil reservoir by SAGD development and the hydrogen storage in conventional reservoirs are compared.Then,the possibility of establishing underground hydrogen storage in the cavity after the development of heavy oil reservoirs by SAGD development is demonstrated by means of numerical simulation.Finally,the hydrogen storage and recovery rate of different injection-production schemes are determined,and the flowing characteristics of hydrogen and original gas in the reservoir in the stage of hydrogen injection and production are clarified.And the following research results are obtained.First,compared with the underground hydrogen storage in the conventional depleted oil and gas reservoir,the hydrogen storage in the depleted cavity after the development of heavy oil reservoir by SAGD development exhibits the advantages like large hydrogen storage,less hydrogen loss caused by hydrogenoil transition zone,no or only a little cushion gas,lower risk of hydrogen embrittlement,and advanced monitoring of trap and caprock stability and gas tightness.Second,the depleted cavity after SAGD development with typical single well group can store 490 t hydrogen,with a recovery rate of about 90%.In addition,with the increase of the injection-production cycle,the produced hydrogen gets purer and purer,with its purity reaching 99%after the fourth cycle of hydrogen pr

关 键 词：稠油油藏 SAGD 地下储氢库 大规模储氢 数值模拟 甲烷产出 氢气回收率 多轮注采 

分 类 号：TK91[动力工程及工程热物理]