Experimental study on supercritical CO2 leakage and diffusion law on offshore platform
CO2 geological storage is one of the most effective approaches to achieve the goal of"carbon peak and carbon neutrality".Offshore CO2 storage usually relies on pipeline reinjection from offshore oil and gas platforms,while leakage may occur during the CO2 reinjection process,seriously threatening the safety of operators.Taking the EP15-1 offshore platform as the research object,the experimental study on supercritical CO2 leakage and diffusion law was conducted.A physical model experimental platform corresponding to EP15-1 was built through scaled design,the supercritical CO2 leakage and diffusion parameters were designed based on the similarity theory and dimension analysis method and similar model experiments on CO2 in offshore platform pipelines under different leakage pressure(1.5-3.0 MPa),leakage aperture(0.5-6.2 mm),leakage direction(horizontal,vertical and oblique 45°)and ambient wind speed(0-0.5 m/s)were carried out to study the diffusion and concentration distribution of leaked CO2 on the platform.The results show that the changes in pressure and ambient wind speed will affect the near-field jet after CO2 leakage,but have little effect on its far-field diffusion.The CO2 concentration will reach a peak after about 20 s of leakage and remain stable,and it will not increase with the increase of leakage time.Leakage diameter will dramatically affect the distribution pattern of axial CO2 concentration at the leakage port.The research results provide a reference for CO2 leakage monitoring and safety protection design on offshore platforms.
offshore platformEP15-1CO2 reinjectionCO2 leakage and diffusion lawphysical model experimentdimension analysis
NETL
NSTL
万方数据
