Pilot projects and feasibility studies that have been performed worldwide confirm the viability of this concept but at low efficiency, paving the way for future innovations in this area.īurning natural gas to heat water for oil sands separation is and energy and carbon-intensive process. Potential challenges in inspection and preparation of these wells in terms of well integrity and productivity with possible remedies are also discussed. Five key challenges relate to well selection, data availability, underground infrastructure, well integrity and regulatory factors. Conversion strategies are discussed for open-loop systems with co-production and enhanced geothermal systems and for true closed-loop systems. This work integrates the accomplishments and key challenges faced from projects that converted hydrocarbon production in geothermal renewable energy and establish guidelines to assist future projects. So far, most studies have been scattered or focused on the viability of converting a specific oilfield. Repurposing must accommodate local energy demand, potential markets, existing infrastructure and technical challenges. Regions of extensive hydrocarbon exploration are often close to market and with significant geothermal gradients. This avoids the major upfront costs of drilling and significant risks of non-transmissive reservoirs that remain major obstacles in the development of geothermal energy. One viable solution is to repurpose such wells for the recovery of low-grade geothermal energy and simultaneously produce a revenue stream, staunch fugitive emissions and maintain workforce engagement. ATES can provide a successful geothermal reservoir boosting in the case of applying a balanced injection of waste heat.Ī debate rages as to whether abandoned oil and gas wells have to be sealed to prevent methane leakage – a potent greenhouse gas – or whether the valuable infrastructure can be repurposed for environmental benefit. An imbalance in heat injection/production in the storage system can cause the reservoir to cool faster than in conventional geothermal heating installation. The paper presents potential for ATES systems in the Lower Cretaceous reservoir of the study area with the best doublet location having thermal recovery ratio of 0.47 and 0.34 for 30 and 40 K temperature differential scenario. Increasing precipitation potential is expected for aragonite and calcite along with a temperature increase, while silica precipitation carries a much smaller risk. The performance simulation of 4 systems has been conducted for 30 years. A methodology of fitting Petrel’s structural and parametrical model to Feflow requirements is provided within this paper. Prior to dynamic simulations in Feflow© software, a regional Petrel© static parametric model which includes a multidisciplinary approach was prepared. The aim of this paper is to study whether the Lower Cretaceous reservoir in this area is suitable for aquifer thermal energy storage. However, in the southern part of the Mogilno–Łódź Trough (Central Poland) is considered to have a lower geothermal potential. The Lower Cretaceous reservoir is known as one of the most prospective for geothermal purposes in Poland. The aquifer thermal energy storage (ATES) has gained attention in several countries as an installation for increasing the energy efficiency of geothermal systems and the use of waste heat.
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