This paper presents an analysis of CO2 injection history for three wells drilled into the water leg of the Krechba reservoir, In Salah, Algeria. The hydro-mechanical behaviour of CO2 storage is reflected in the injection history of wells. Detailed analysis of pressure versus flow rate was carried out to differentiate between periods of matrix and fracture injection and assess optimum injection pressure. The history clearly shows periods of CO2 injection into the reservoir (and possibly surrounding rocks) under fracturing conditions, thus providing the formation fracturing pressure and maximum matrix flow rate. The maximum applied pressure in all three wells has likely exceeded the fracturing pressure of the reservoir at various periods since project start-up. The findings are supported by other sets of data such as in-situ stress profile, empirically calculated fracturing pressure, FIT, LOT and microseismic events.


Article metrics loading...

Loading full text...

Full text loading...

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error