System for automated real-time water injection well testing

A system for an injection well having an injection wellhead, the system comprising:

• a measurement device installed on the injection wellhead, wherein the measurement device is configured to measure a pressure of the injection well at the injection wellhead;
• and
• a non-transitory computer readable medium coupled to the measurement device, the non-transitory computer readable medium storing instructions comprising functionality for:
• injecting a fluid into the injection well at a plurality of injection rates;
• measuring an injection bottom hole pressure at each injection rate to determine a plurality of injection bottom hole pressures, wherein the injection bottom hole pressure at each injection rate is measured using a density of a fluid in the injection well, a depth of the injection well, a pressure loss due to friction, and the pressure of the injection well at the injection wellhead at each injection rate;
• determining a relationship between the plurality of injection rates and the plurality of injection bottom hole pressures;
• and
• determining an injectivity index of the injection well using the relationship.