Thermoelastic Fracturing on Water Injectors as Part of Injectivity Enhancement in Giant Offshore Carbonate Field. Case Study

Sarsekov, Arlen (Adnoc Offshore)


Water Injection is part of secondary recovery mechanism which aims to increase oil recovery by increasing or maintaining the reservoir pressure and provide additional pressure support. Most of the time water injection is controlled under matrix injection below the fracture pressure in order to avoid the creation of fractures and risk of bypass oil. However, there are two different mechanisms of fracture creation in water injection: poroelastic fracturing and thermoelastic fracturing. First one will activate above fracture point, while the second one creates below the original fracture point and most of the time missed in reservoir field development Normally fractures can be categorized in 3 groups: - Fractures induced due to increase of injection pressure above pore pressure.