In Pakistan, round about 1000 oil and Gas exploratory wells have been drilled having depth ranging from 230 m to +6400 m. More than 60 percent wells have been abandoned or dry wells. In spite of all exploratory effort we are not able to overcome the energy need of the country. Present study looks forward to reutilizing these abandoned wells by using subsurface data related to thermal characteristics of rock sequence. Present study shows heartening geothermal gradient exception in lower Indus Basin coupled with buried fossil-fail-rift basement structure. Aeromagnetic survey has also disclosed significant prediction for the "hot dry rock" geothermal energy in KharanPanjgur tectonic depression in western part of the Pakistan. Literature review shows for electricity production hot dry rock (HDR) geothermal environment offers massive potential. These resources are mostly much deeper than the hydrothermal resources. Hot dry rock energy comes from moderately water-free hot rock found at a depth of 4,000 meters or more below the earth surface. In contrast to a geothermal field in one of the tectonic/volcanic anomalies, the HDR system depends on the artificial simulation of tight formations by hydraulic fracturing to create underground heat exchanger. Fluid circulated in closed circuit mode where as reservoir pressure is managed by balanced production and injection rates in multiple well arrays. Current study shows the matchless application of collection data of Oil and Gas exploratory wells to develop renewable and sustainable energy operation in Pakistan.
Various under-developed countries are not capable to accomplish its domestic energy requirements and are undergoing sensitive energy crises. Electricity Sector has been most suffered due to the energy shortage. Geothermal power production is capable to fulfill the electricity demand of different countries. Geothermal power plant can use water from an aquifer at moderately higher temperature and produce power using dry steam, flashing or binary cycle. Traditionally, geothermal energy has been exploited in places with plentiful hot water at relatively shallow depth. There are several high gradient geothermal resources available in the world but without the presence of aquifer it is impossible to utilize these resources. It is still unknown how to generate power by using dry rock resources. We aimed to focus on the way to generate electricity by utilizing the dry rock resources. This way of electricity generation will be cost effectively and can produce electricity on constant or permanent basis. Current study lead a new direction that how abandoned oil and gas wells are helpful to overcome the energy crises and have ability to generate the cheap electricity for a long term period. This study discusses the power generation system for commercial electricity production. Three different source temperatures (142˚C, 157˚C, and 177˚C) were considered. Optimal working fluid and optimal design that improve the performance of plant are determined. Here we saw that a 12 inch double-pipe heat exchanger, which penetrates to a depth of 3 km, could extract sufficient energy to drive a 3.2 MW turbine generator system.
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