Numerical simulation of cavity hydrogen storage potential after SAGD development in heavy oil reservoirs
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 steam-assisted 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 hydrogen-oil 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 production.Third,different hydrogen storage modes can result in different accumulation positions of methane in the depleted cavity.In the long-term storage mode,the methane mainly accumulates at the bottom of the depleted cavity after the ending of hydrogen injection,while in the short-term storage mode,the methane is only pushed by the hydrogen to both sides of the top of the depleted cavity,which leads to different methane production patterns during the hydrogen production process.In conclusion,the storage of high-purity hydrogen in the reservoirs after SAGD development has remarkable advantages in hydrogen storage volume,hydrogen recovery purity and underground hydrogen storage construction cost,and it can realize large-scale hydrogen storage with high economic benefit.The research results can provide reference and guidance for the site selection,construction and operation of underground hydrogen storage in China.
Heavy oil reservoirSAGDUnderground hydrogen storage(UHS)Large-scale hydrogen storageNumerical simulationMethane productionHydrogen recovery rateMulti-cycle injection and production
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