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122 Chapter 1 Synopsis and Executive Summary field testing has successfully demonstrated that reservoirs of sufficient size with nearly sufficient connectivity to produce fluids at commercial rates can be established. Through field tests in lowpermeability crystalline rock, researchers have made significant progress in understanding reservoir characteristics, including fracture initiation, dilation and propagation, thermal drawdown, water loss rates, flow impedance, fluid mixing, and fluid geochemistry. In addition to using hydraulic stimulation methods to establish connectivity in the far field, it is feasible to create permeability near injection or production wellbores by explosive fracturing, chemical leaching, and thermal stress cracking (Armstead and Tester, 1987; Tester et al., 1989). Included among the milestones that have been achieved are: • Drilling deep directionally oriented wells to specific targets. • Creation of contained fracture systems in large volumes of rock of 1 km3 or more. • Improved understanding of the thermalhydraulic mechanisms controlling the opening of fracture apertures. • Improved methods for sequencing the drilling of wells, stimulating reservoirs, and managing fluid flow and other hydraulic characteristics. • Circulation of fluid at wellflow rates of up to 25 kg/s on a continuous basis. • Methods to monitor and manage induced microseismicity during stimulation and circulation. • Extraction of heat from welldefined regions of hot fractured rock without excessive thermal drawdown. • Generation of electrical power in small pilot plants. Nonetheless, there are outstanding issues that must be resolved before EGS can be considered commercial. In general, these are all connected to enhancing the connectivity of the stimulated reservoir to the injection and production well network. Notably, they are incremental in their scope, representing extending current knowledge and practical field methods. There are no anticipated “showstoppers” or fundamental constraints that will require new technologies to be discovered and implemented to achieve success. The remaining priority issue is demonstrating commercial levels of fluid production from several engineered EGS reservoirs over acceptable production periods. Specific research and fieldtesting goals can be placed into two categories: 1. Primary goals for commercial feasibility: • Develop and validate methods to achieve a twofold to fourfold increase in production wellflow rate from current levels, while maintaining sufficient contact with the rock within the reservoir and ensuring sufficient reservoir lifetime. • Validate longterm operability of achieving commercial rates of heat production from EGS reservoirs for sustained periods of time at several U.S. sites. 2. Secondary goals connected to EGS technology improvement: • Develop better methods of determining the distribution, density, and orientation of preexisting and stimulated fractures to optimize overall hydraulic connectivity within the stimulated reservoir.PDF Image | Synopsis and Executive Summary
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