首页|双井周期注CO2联合降压法开采天然气水合物分析

双井周期注CO2联合降压法开采天然气水合物分析

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  • 国家科技期刊平台
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相较于单纯地封存CO2,CO2置换法开采天然气水合物(以下简称水合物)能够满足水合物资源开采和碳封存的双重需求.为确保安全高效开发水合物的同时提高CO2封存率,按照双井周期注入CO2联合降压法开采水合物的思路,以中国南海典型水合物藏为研究对象,建立了矿藏尺度水合物注采热—流—固—化四场耦合数值模型,并开展了连续、间歇、循环3类注入开采方案和单井降压开采方案的对比分析,然后模拟分析注CO2辅助水合物降压开采的增产效果,最后对比了不同注入方案的CO2回收和封存情况,探索了水合物法碳封存的可行性.研究结果表明:①邻井CO2的注入有助于降低产水量并缓解降压开采引起的地质沉降;②间歇注入较循环注入可促进储层中CO2水合物生成,扩大注入井附近的高温区域,有利于生产井附近水合物的分解;③连续注入方式有利于分解气体的产出,但双井注采模式降低了甲烷水合物分解程度;④双井注采的CO2注入分为快速注入阶段、反转阶段和缓慢注入阶段,其中双井间歇注入方案的CO2注入效率最高.结论认为,双井间歇注入CO2复合降压法能够在安全、高效开采水合物的同时具有相对可观的碳封存效果,是一种实现水合物商业化开采和助力双碳目标实现的潜在方法,研究成果对于天然气水合物开发及CO2地质封存具有理论指导意义.
Dual-well cyclic CO2 injection assisted gas hydrate depressurization production
Different from the simple CO2 storage,the CO2 replacement method can meet the dual demands of natural gas hydrate(hereinafter referred to as hydrate)production and carbon storage when it is used to produce hydrate.To ensure the safe and efficient hydrate production while improving the CO2 storage ratio,this paper takes the typical hydrate in the South China Sea as the research object to establish a reservoir-scale thermal-hydraulic-mechanical-chemical field coupled numerical model of hydrate injection and production according to the idea of dual-well cyclic CO2 injection assisted hydrate depressurization production method.Then,the continuous,intermittent,and cyclic injection production schemes are compared with the single-well depressurization production scheme,and the stimulation effect of CO2-assisted hydrate depressurization production is simulated and analyzed.Finally,different injection schemes are compared from aspects of CO2 recovery and storage,and the feasibility of hydrate method in CO2 storage is explored.And the following research results are obtained.First,CO2 injection in the neighboring well can reduce water production rate and alleviate geological subsidence caused by depressurized production.Second,compared with cyclic injection,intermittent injection can promote the formation of CO2 hydrates in the reservoir and enlarge the high-temperature zone near the injection well,which facilitates hydrate dissociation near the production well.Third,the continuous injection enhances the production of dissociated gas,while the dual-well injection and production diminishes the dissociation extent of methane hydrate.Fourth,CO2 injection in the dual-well injection and production is divided into rapid injection,inversion,and slow injection stages,and the dual-well intermittent injection scheme demonstrates the highest CO2 injection efficiency.In conclusion,the dual-well intermittent CO2 injection assisted depressurization method can achieve safe and efficient hydrate production while providing a significant carbon storage effect.It is a potential approach to achieve commercial hydrate production and contribute to the realization of dual-carbon goals.The research results are of theoretical significance to guide hydrate production and CO2 geological storage.

Natural gas hydrateDepressurization productionCO2Dual-well cyclic injectionProductivity simulationCarbon storageHydrate dissociationGeological subsidence

张逸群、杜红星、王海柱、李根生

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海洋天然气水合物全国重点实验室·中国石油大学(北京)

油气资源与工程全国重点实验室·中国石油大学(北京)

天然气水合物 降压开采 CO2 双井循环注入 产能模拟 碳封存 水合物分解 地质沉降

国家自然科学基金联合基金国家自然科学基金面上项目广东省海洋经济发展(海洋六大产业)专项

U20B600552174009GDNRC[2022]44

2024

10.3787/j.issn.1000-0976.2024.03.017

天然气工业
四川石油管理局 中国石油西南油气田公司 中国石油川庆钻探工程公司

天然气工业

CSTPCD北大核心EI
影响因子：2.298
ISSN：1000-0976
年,卷(期)：2024.44(3)
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