Analysis of Wells with Multistage Fractures

Investigator: Kongphop Wongpattananukul

To characterize a fracture network deep underground, inverse modeling is needed. By analyzing the system response such as pressure and temperature changes with time due to scheduled fluid production and/or injection, the system properties can be inferred such as matrix permeability, fracture permeability, fracture geometry, thermal conductivity. However, fast and reliable analytical or semianalytical solutions for both pressure and temperature are required --  these are the main focuses in this study.

In unconventional resources, a system connected hydraulically through only rock matrix is preferred. The main goal for unconventional resources is to maximize production of oil and gas. Each connection by a fracture (known as a “frac-hit”) couples two wells together and hampers production from targeted region inside reservoir.

On the other hand, in enhanced geothermal systems (EGS), a system connected hydraulically through fractures is preferred. The main goal for enhanced geothermal systems is to maximize heat extraction using fluid circulation between the wells. Each connection through a fracture creates a fluid pathway between producer and injector with large surface area for fluid to contact with rock matrix and hence enhances heat transfer to the circulating fluid.