**An Efficient and Accurate Approach for Studying the Heat Extraction from Multiple Recharge and Discharge Wells**

Bisheng Wu, Xi Zhang, Andrew Bunger and Rob Jeffrey

Additional information is available at the end of the chapter

http://dx.doi.org/10.5772/56373

### **Abstract**

In order to understand the thermal recovery Behavior of an engineered geothermal system (EGS), this paper develops a model in which fluid circulates in a single, planar hydraulic fracture with a constant hydraulic aperture via multiple recharging and discharging wells. The coupled equations for heat convection in the fracture plane and heat transfer into the rock are provided for steady and irrotational fluid flow conditions. By using velocity poten‐ tials and streamline functions, the temperature along a streamline is found to be only a func‐ tion of the potential. By utilizing the Laplace transformation, the analytical solutions in the Laplace space for the temperature field are found, which are numerically inverted for timedomain results. Several examples with different arrangements of injection and production wells are investigated and the comparison with other published results is provided. The semi-analytical results demonstrate that the proposed model provides an efficient and accu‐ rate approach for predicting the temperatures of a multi-well reservoir system.
