The quest for a sustainable energy future, increasing economic demand for stable electricity and high cost of Oil and Gas field abandonment has led to strong consideration of the possibility of extracting Geothermal energy from High Temperature Mature Oil and Gas fields in Nigeria. Nigeria, as endowed as the country is with oil and natural resources, still battling with an acute shortage of power supply for both domestic and industrial consumptions. It is therefore imperative that additional energy be generated and added to the present energy capacity in order to cater for Nigeria impending energy crisis which leaves many industries running at high cost and keeps many private homes in blackout. Mature fields are mostly characterized by large water cut and thus increase the cost of wastewater disposal (OPEX). To increase this field profitability, heat extraction from this medium temperature field generates electricity thus reducing the energy requirement of the field while also generating capital. The geothermal gradient in Niger Delta ranges from 1.3 to 5.5°C/100 m and could be as high as 7.6°C/100m in Sokoto Basin. Literature reported that the Amenan-Npono Oil and Gas field discovered in 1990 with reservoir depth between 3400 to 4700 m, has a porosity of 15%, permeability of several hundred millidarcy, the reservoir pressure is between 350 to 500 bar and temperature in the range of 130 to 150°C. In analyzing the produced fluid, an integrated investigation is being employed to model the fluid flow from reservoir to the surface facilities by using MBAL, PROSPER and GAP to predict tubing, pipeline hydraulics and temperature of the well. This paper discusses the potentials of generating additional energy through the conversion of depleting oil and gas wells to a geothermal energy plant in order to meet the energy demand of Nigerian populace, and analysis of possible well integrity issues that these fields could encounter which might result to lost production or induce significant maintenance costs. The well integrity risk assessment associated with the existing well design and operations most especially casing and cement failures arising from temperature and thermal effects some of the potential matured fields was investigated. An analysis of potential energy capacities from the produced fluids (water and gas) and design of the efficient energy conversion system are also discussed. This study was carried out using an open-source data from the internet and all judgments were based on its accuracy. The benefits accrued to this research work when fully implemented, will not only be seen in improving the electricity generation in Nigeria but also in the areas of employment opportunities, economy boost for the Government, development of Indigenous research sector, and near-zero carbon emissions by reducing gas flaring operation. The energy generated can offset the cost of day-to-day energy consumption of the field while the excess can be sold to the neighboring community or added to the National grid. Economic analysis of a similar project in Italy yielded a reasonable payback time of less than four years with an investment of just over a million euros while generating approximately 400GWh of electricity.

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