Optimization Of Hydraulic Fracturing For Horizontal Wells In Enhanced Geothermal Reservoirs

Geothermal energy is a renewable energy source that can be found in abundance on our planet.Only a small fraction of it is currently converted to electrical power,though in recent years installed geothermal capacity has increased considerably all over the world.Increasing production of electricity through geothermal reservoirs greater than wind and solar resources,but that production is minimal than biomass and hydroelectricity.There is a dangerous climate change accurse in the world which gave almost no further choice to pollute the atmosphere.Even though,the energy supply from renewable resources increased in some countries,a clean and green shift from coal reserves to natural gas in some other countries,greenhouse gases are continuously polluting globally with more increasingly in the past few years.Electricity or heat production from burning the fossil fuels is considered to be the half responsible for the total global warming.Geothermal energy is a potential renewable energy source with very low CO2 emissions but stored the large amount of heat in earth crust.In this research,we assumed a model for designing of Enhanced Geothermal System,EGS.We used Computer-Modeling Group,CMG reservoir simulation software to create the typical Hot Dry Rock,HDR reservoir.Two wells one for injecting the surface water and one for the production of hot water are installed in the model with three different surface water injection rates.In this study the fracture half-length,fracture conductivity,reservoir permeability,initial reservoir pressure,initial reservoir temperature,well spacing is evaluated.At the last part of this study,the optimization technique applied to the model to evaluate the sufficient energy production.There are some hydraulic fractures created by the mentioned software.Three different hydraulic fracturing half-lengths,horizontal well length are assumed.The different fracturing half-length,horizontal well length and surface water injection rate considered in order to evaluate the sufficient production of energy.The rete of production of energy,thermal breakthrough and hot water production rate are defined.The results explain that the gas generated from the HDR is insignificant and the water production comes from the production well as it is demanded because of hydraulic fractures presence made in these two wells.It can be seen that as more water is injected the energy production becomes less maybe it is because of the reduction thermal degree in reservoir.The aforementioned results are illustrated by some graphs,charts and tables.In this research the production of energy is quantified in a period of 10 years.