POROUS POLYMER TO MODIFY FRACTURE PERMEABILITY THE GOAL OF THIS PROPOSED PROJECT IS TO DEVELOP GEOTHERMAL-SPECIFIC POROUS POLYMERS THAT CAN REDUCE FRACTURE PERMEABILITY INDEFINITELY BY AT LEAST A FACTOR OF 10 FOR FORMATION TEMPERATURES OF 150 TO 275 °C, BE DEPLOYED WELL AWAY FROM WELLBORE, AND BE REVERSIBLE. OBJECTIVES ARE: BUDGET PERIOD 1 OBJECTIVES: IDENTIFY POLYMERS THAT CAN INVADE AND WET ROCK FRACTURES UP TO 275 °C. SYNTHESIZE MICROCAPSULE (ABBREVIATED AS MC HEREIN) AT UP TO 275 °C. INVESTIGATE MICROCAPSULE MOVEMENT IN FRACTURES. BUDGET PERIOD 2 OBJECTIVES: COMPLETE SCREENING AND TESTING OF PHYSICAL PROPERTIES OF SUITABLE POLYMERS. DEVELOP MCS THAT RUPTURE UP TO 275 °C AS FUNCTION OF TIME. DEMONSTRATE MC SURVIVABILITY IN SIMULATED DOWNHOLE CONDITIONS. BUDGET PERIOD 3 OBJECTIVES: DEMONSTRATE POROUS POLYMER FORMATION IN ROCK FRACTURES AT UP TO 275 °C. PROVIDE SPECIFICATIONS FOR FIT-FOR-PURPOSE POLYMERS AND MCS. RECOMMEND FIELD DEPLOYMENT METHODOLOGY PROVIDE ENVIRONMENTAL ASSESSMENT OF ALL MATERIALS RELATED TO TECHNOLOGY. DEVELOP NETWORK FRACTURE MODEL OF MC MOVEMENT.