Investigation on the Relationship between Wellhead Injection Pressure and Injection Rate for Practical Injection Control in CO2 Geological Storage Projects

摘要: The existing investigations on the maximum allowable wellhead injection pressure have found upper limit of pressure, which, however, cannot provide a practical operational designing scheme parameters for CO2 geological storage projects. Therefore, this work firstly proposes complete constraint conditions wellbore to realize whole process forward and inverse calculations then applies it explore relationship between rate. results show that rate are pair mutually constrained physical quantities. For certain project, separately form continuous interval. Change one quantity within its interval will also change other interval, both jointly forming closed region. Thus, controlling in region can simultaneously ensure effectiveness safety injection. Subsequently, further studies factors impacting finds all temperature injected fluid, saturation, characteristic reservoirs only their lower limits some extent but no essential effects relationship. Application theory method Shenhua CCS demonstration project obtained diagram rate, which actual just fall into diagram, effectively verifying reliability work.