Making Water Injection Interventions Work: The Importance of Understanding Thermal Effects in Fractured Water Injectors

Duvivier, G. (BP) | Al-Naqi, M. (Kuwait Oil Company) | Ameen, A. A. (Kuwait Oil Company) | Al-Enizi, N. (Kuwait Oil Company) | Al-Shati, A. (Kuwait Oil Company) | Rajan, S. (Kuwait Oil Company) | Clark, R. A. (BP)


Stimulating water injectors successfully is critical to any waterflood and to successfully stimulate wells it is important to understand what technology works and what does not. An effective method of evaluating stimulation efficency is by monitoring the long term performance of the water injectors and how injection pressure and temperature varies over time. The primary source of injection water for Greater Burgan is produced water, which is collected through an extensive gathering system. Because this gathering system is so large, the resulting fluids drop to atmospheric temperature before they are available for injection. Average daily temperatures in Kuwait vary by more than 60 F annually. All of the injection wells are injecting above fracturing pressures and these temperature swings impact the size of fractures leading to observed changes in rate of up to 40%. These effects must be understood to evaluate the impact of injection fluid temperature upon stimulation. Monitoring this surface injection data has allowed the team to select a successful stimulation method for the injectors and added significantly to the field's injection rate.