- Thermal Effects on Shear Fracturing and Injectivity During CO2 Storage
- S. Goodarzi ; A. Settari ; M. Zoback ; W.D. Keith
- Book Title / Journal: Effective and Sustainable Hydraulic Fracturing
- Year: 2013 , Series: Chapter 48
- Other Geotechnical
- Keywords: Shear Fracturing ; thermal effects ; CO2 Storage
- With almost two hundred coal burning power plants in Ohio River valley, this region is considered important for evaluation of CO2 storage potential. In a CO2 storage project, the
temperature of the injected CO2 is usually considerably lower than the formation temperature. The heat transfer between the injected fluid and rock has to be investigated in order to test the viability of the target formation to act as an effective storage unit and to optimize the storage process. In our previous work we have introduced the controversial idea of injecting CO2 for storage at fracturing conditions in order to improve injectivity and economics. Here we examine the thermal aspects of such process in a setting typical for Ohio River Valley target formation.
A coupled flow, geomechanical and heat transfer model for the potential injection zone and
surrounding formations has been developed. All the modeling focuses on a single well
performance and considers induced fracturing for both isothermal and thermal injection
conditions. The induced thermal effects of CO2
injection on stresses, and fracture pressure, and
propagation are investigated. Possibility of shear failure in the caprock resulting from heat
transfer between reservoir and the overburden layers is also examined.