Above-zone pressure monitoring and geomechanical analyses for a field-scale CO2 injection project in Cranfield, MS

作者：Kim Seunghee; Hosseini Seyyed Abolfazl^*

来源：Greenhouse Gases: Science and Technology , 2014, 4(1): 81-98.

DOI：10.1002/ghg.1388

• CO2 geological storage
• above-zone pressure monitoring
• poroelasticity
• cranfield

Pressure and temperature monitoring of an above-zone monitoring interval (AZMI), as well as of an injection zone (IZ), has been attempted at a field-scale CO2 injection site in Cranfield, MS. Recorded pressure data in the AZMI revealed a certain amount of increase with no evidence of direct fluid flow between the IZ and the AZMI. We therefore attempted to interpret the field-measurement data from a geomechanical perspective. First, we tried an analytical approach that combined Green's functions with a poroelastic theory that is based on Segall's derivation (1992). The analysis was shown to provide fast first-order and probabilistic estimation. Next, we attempted a numerical simulation in which fully coupled calculation between fluid flow and poroelasticity was implemented. Numerical-simulation results using COMSOL matched well with the field data at one monitoring location in the AZMI. However, field data differ from those of a numerical simulation at the other monitoring well. We suggest that field measurement at the other location in the AZMI might be disturbed during the pressure monitoring, based on bottom-hole pressure records in the IZ and thermal signals. Following the numerical simulation, we discuss the effect of single-phase fluid flow assumption, observations for thermal effect and pore-pressure-stress coupling, and desirable resolution of pressure gauges for the optimal utilization of above-zone pressure monitoring.

• 出版日期2014-2