| Title | Experimental Study of Hydraulic Fracturing in Water Dominated Geothermal Field Using Numerical Simulator, Improvement and Comparison of Parameters and Experimental Designs |
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| Authors | Luthfan Hafizha JUDAWISASTRA, Nenny Miryani SAPTADJI, Heru Berian PRATAMA |
| Year | 2020 |
| Conference | World Geothermal Congress |
| Keywords | Hydraulic Fracturing, Numerical Simulation, Wairakei, Water Dominated, Plackett-Burman, Experimental Design, Monte Carlo |
| Abstract | Geothermal wells that have existing heat and fluids but are lack of permeability usually end up being not commercial, this problem could be solved by implementing hydraulic fracturing stimulation that has been a huge success in the oil and gas industry. Hydraulic fracturing is a stimulation method used to increase the performance of a well by creating artificial fractures which will increase near-wellbore permeability, overcome formation damage and connect natural fractures that already exist in the reservoir. This study is a development from a previous study with additional tested parameter and two experimental designs (full factorial and Plackett-Burman) to study the uncertainty parameters of hydraulic fracturing stimulation in a water dominated reservoir for the outcome of mass rate, by using existing published CMG STARS numerical model of Wairakei geothermal field. The simulation results from each experimental design scenarios are then followed by a statistical analysis using MiniTab software and a Monte Carlo simulation for a probabilistic result. The result concluded that fracture half-length appears to be the most significant parameter and the most probable mass rate output after hydraulic fracturing implementation or P10 from the Monte Carlo Simulation is estimated to be around 115 kg/s which is 1.6 times the base case for both designs. While the P50 and P90 for full factorial design are 346 kg/s and 752 kg/s and for Plackett-Burman 346 kg/s and 752 kg/s respectively. Compared to previous study, the additional parameter ends up being the least significant parameter to the mass rate output, therefore no significant impact. Furthermore, unlike the use of full factorial design, Plackett-Burman experimental design produces an unsatisfactory result when used in this study. |