Готові списки джерел за темами / Drilling induced damage

Добірка наукової літератури з теми "Drilling induced damage"

Автор: Grafiati

Опубліковано: 6 вересня 2023

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Статті в журналах з теми "Drilling induced damage"

Díaz-Álvarez, Antonio, Ángel Rubio-López, Carlos Santiuste, and María Henar Miguélez. "Experimental analysis of drilling induced damage in biocomposites." Textile Research Journal 88, no. 22 (August 13, 2017): 2544–58. http://dx.doi.org/10.1177/0040517517725118.

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This paper focuses on the analysis of drilling induced damage on biocomposites (woven fibers of cotton, flax and jute combined with polylactic acid, PLA, as the matrix). The main contribution of this work is the analysis of the influence of cutting parameters and drill geometry on fully biodegradable composites based on two different types of PLA and different fibers types. The damaged area was studied both at the hole entry and exit. Contrary to the behavior commonly observed when drilling conventional composites, delamination was negligible. The hole entry and exit damage were analyzed and quantified in terms of the fraying extension being the dominant. The damage extension was found to be dependent on the matrix, fiber type and drill geometry. The combination between cotton fiber and the small drill point angle showed the lowest level of damage. On the other hand, composite reinforced with flax fibers (those that exhibited the highest tensile strength) presented the greatest damage extension, increasing with the number of layers of the composite. The matrix based on polymer 10361D PLA, recommended for natural fibers because of the better interface cohesion, resulted in reduced fraying. Concerning the influence of cutting parameters, damage decreased when increasing the cutting speed and feed rate.

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Xu, Jinyang, Qinglong An, and Ming Chen. "An experimental investigation on cutting-induced damage when drilling high-strength T800S/250F carbon fiber–reinforced polymer." Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture 231, no. 11 (December 19, 2015): 1931–40. http://dx.doi.org/10.1177/0954405415619348.

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In modern manufacturing sectors, mechanical drilling of high-strength carbon fiber–reinforced polymer represents the most challenging task as compared to conventional low-strength carbon fiber–reinforced polymer drilling due to the extremely superior mechanical/physical properties involved. The poor machinability of the composite usually results in serious geometric imperfection and physical damage in drilling and hence leads to a large amount of part rejections. In this article, an experimental investigation concerning the cutting-induced damage when drilling high-strength carbon fiber–reinforced polymer laminates was presented. The studied composite specimen was a newly developed high-strength T800S/250F carbon fiber–reinforced polymer composite. A special concentration was made to inspect and characterize the phenomena of various cutting-induced damage promoted in the material drilling. The work focused on the study of the influence of cutting parameters on the distribution and extent of hole damage formation. The experimental results highlighted the most influential factor of feed rate and tool wear in affecting the final extent of induced hole damage when drilling high-strength T800S/250F carbon fiber–reinforced polymer. For minimizing the various damage formation, optimal cutting parameters (high spindle speed and low feed rate) and rigorous control of tool wear should be seriously taken when drilling this material.

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Liu, Xiuquan, Guoming Chen, Jingjie Fu, Jingqi Ji, Qiang Song, and Yuanjiang Chang. "Analysis on the Operation Fatigue of Deepwater Drilling Riser System." Open Petroleum Engineering Journal 9, no. 1 (December 14, 2016): 279–87. http://dx.doi.org/10.2174/1874834101609010279.

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Fatigue is one of main failure modes of deepwater drilling riser system. Analysis models of wave induced fatigue and vortex induced fatigue of deepwater drilling riser are established according to the riser connection, installation and hang-off operations. Characteristics of wave induced fatigue and vortex induced fatigue of riser system in different operation modes are studied. The influence of each operation fatigue on the combined fatigue is also identified. The results show that wave induced fatigue damage and vortex induced fatigue damage of upper riser are large in installation and hard hang-off modes. The fatigue damage of riser system in soft hang-off mode is less than that in hard hang-off mode. The combined fatigue damage of the upper and lower riser is large. The lower riser is under the influence of wave induced fatigue and vortex induced fatigue, while the upper riser is mainly under the influence of wave induced fatigue, especially that in installation and hang-off modes. The fatigue damages of riser in installation and hang-off modes have a great influence on the combined fatigue of riser and cannot be neglected in riser fatigue analysis.

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Ding, Yu, Gerard Renard, and Benjamin Herzhaft. "Quantification of Uncertainties for Drilling-Induced Formation Damage." SPE Production & Operations 23, no. 02 (May 1, 2008): 221–31. http://dx.doi.org/10.2118/100959-pa.

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Ding, Y., and G. Renard. "Evaluation of Horizontal Well Performance After Drilling-Induced Formation Damage." Journal of Energy Resources Technology 127, no. 3 (March 22, 2005): 257–63. http://dx.doi.org/10.1115/1.1924463.

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It is well recognized that near-wellbore formation damage can dramatically reduce well productivities, especially for open hole completed horizontal wells. The economic impact of poor productivity of these wells has pushed toward significant efforts in recent years to study laboratory testing techniques and numerical modeling methods for predicting and controlling drilling-induced formation damage. This paper presents an integrated approach, combining a near-wellbore modeling with laboratory experiments for data acquisition as input for the model, to evaluate the performance of oil and gas wells after drilling-induced formation damage.

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Nicula, S., and A. Lyne. "NMR imaging studies on drilling fluid induced rock damage." Magnetic Resonance Imaging 19, no. 3-4 (April 2001): 579. http://dx.doi.org/10.1016/s0730-725x(01)00337-x.

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Díaz-Álvarez, A., M. Rodríguez-Millán, J. Díaz-Álvarez, and M. H. Miguélez. "Experimental analysis of drilling induced damage in aramid composites." Composite Structures 202 (October 2018): 1136–44. http://dx.doi.org/10.1016/j.compstruct.2018.05.068.

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Maddinelli, G., S. Cobianco, and A. Guarneri. "Characterization of drilling fluid-induced damage in sandstone cores." Magnetic Resonance Imaging 25, no. 4 (May 2007): 570–71. http://dx.doi.org/10.1016/j.mri.2007.01.069.

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Chen, Chen, Aixu Wang, Zhi Zheng, Qing Zhao, Zhanli Shi, and Yongjie Bao. "A Study on Drilling of CFRP/Ti Stacks: Temperature Field and Thermal Damage of the Interface Region." Materials 16, no. 7 (March 24, 2023): 2586. http://dx.doi.org/10.3390/ma16072586.

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Carbon fiber reinforced plastics (CFRP)/titanium alloy (Ti) stacks have been widely used in aviation field due to the superior mechanical properties. During integrated drilling of CFRP/Ti stacks, serious damage occurs in the CFRP layer because of the disparate properties of two stack components. Heat accumulation and thermal induced damage are typical and critical issue during drilling stacks, especially in the interface region. In this study, in order to deeply analyze the thermal influence of the interface region, a numerical model based on the finite difference method is developed to predict the three-dimensional drilling temperature field. Experiments with accurate measurement point are conducted to valid the rational of temperature prediction model. The results confirm that the temperature distributions predicted by numerical study have good agreements with the experimental results and the maximum error is about 10.3%. Furtherly, based on the drilling experiments, it can be found that thermal damage induced by cutting heat occurs as discoloration rings around the hole which could cause the elastic modulus of resin matrix decrease. An empirical model of thermal damage with maximum drilling temperature of the interface region are developed with the correlation of R2 = 0.97. The findings point out that as the maximum drilling temperature exceeds 410 °C, serious thermal damage could occur in the resin matrix of CFRP layer.

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Bajpai, Pramendra Kumar, Kishore Debnath, and Inderdeep Singh. "Hole making in natural fiber-reinforced polylactic acid laminates." Journal of Thermoplastic Composite Materials 30, no. 1 (August 5, 2016): 30–46. http://dx.doi.org/10.1177/0892705715575094.

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Natural fiber-reinforced composite materials are finding wide acceptability in various engineering applications. A substantial increase in the volume of production of these composites necessitates high-quality cost-effective manufacturing. Drilling of holes is an important machining operation required to ascertain the assembly operations of intricate composite products. In the present experimental investigation, natural fiber (sisal and Grewia optiva fiber)-reinforced polylactic acid-based green composite laminates were developed using hot compression through film stacking method. The drilling behavior of green composite laminates was evaluated in terms of drilling forces (thrust force and torque) and drilling-induced damage. The cutting speed, feed rate, and the drill geometry were taken as the input process parameters. It was concluded that all the three input process parameters affect the drilling behavior of green composite laminates. The drill geometry was established as an important input parameter that affects the drilling forces and subsequently the drilling-induced damage.

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Більше джерел

Дисертації з теми "Drilling induced damage"

Ismail, Sikiru Oluwarotimi. "Machinability analysis of a drilling-induced damage on fibre reinforced composites." Thesis, University of Portsmouth, 2017. https://researchportal.port.ac.uk/portal/en/theses/machinability-analysis-of-a-drillinginduced-damage-on-fibre-reinforced-composites(65bff84e-d89b-4a43-a23f-f7bf8f69e373).html.

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This research presents a comprehensive experimental investigation on the machinability effects of variable drilling parameters (feed rate, cutting speed and thrust force), drill diameters and chips formation mainly on delamination and surface roughness, in addition to other drilling-induced damage on both natural and synthetic fibre reinforced polymer (FRP) composites: hemp fibre reinforced polymer (HFRP) and carbon fibre reinforced polymer (CFRP) composite laminates respectively, using double-fluted coated high speed steel (HSS) drills under dry machining and compressed air cooling conditions. It also describes a thermo-mechanical models for predicting and analysing onset push-out delamination during FRP composite machining. After a broad and critical literature survey on FRP composites and their drilling has been carried out, three principal stages of experimental, and an analytical works were conducted to investigate and analyse the influence of both conventional drilling (CD) and ultrasonically-assisted drilling (UAD) techniques on different specimens of HFRP and CFRP composites. Stage 1 involved the CD of 5 specimens of 197 x 197 mm, 7.5 mm thickness HFRP composite laminates of aspect ratios (AR) of 00 (neat), 19, 23, 30 and 38, using diameter holes of 5.0 and 10.0 mm for delamination and surface roughness respectively, among other drilling-induced damage. Taguchi’s technique was used in the design of experiment. The results obtained show that increase in cutting speed reduced delamination factor and surface roughness of drilled holes. However, increase in feed rate caused an increase in both delamination factor and surface roughness. Feed rate and cutting speed had the greater influence on delamination and surface roughness respectively, when compared with aspect ratio, while an increase in fibre AR caused a significant increase in both delamination factor and surface roughness. The optimum results occurred at cutting speed and feed rate (drilling parameters) of 20 mm/min and 0.10 mm/rev, respectively, when drilling specimen of AR 19. The stage 2 experiment described a comprehensive investigation on the machinability effects of CD parameters, drill diameters and chips formation on the same drilling-induced damage on an optimal specimen of 19-HFRP and MTM 44-1/CFRP composite laminates, using the same specimen dimensions, drills, drilling parameters and condition. The results obtained depict that an increase in feed rate and thrust force caused an increase in delamination and surface roughness of both specimens, different from cutting speed. But HFRP and CFRP specimens have greater surface roughness and delamination-drilling damage respectively. Also, increased drill diameter and types of chips formation caused an increase in both delamination and surface roughness of both specimens as the material removal rate (MRR) increased. Evidently, the minimum surface roughness and delamination factor of the two specimens for an optimal drilling are associated with feed rates of 0.05-0.10mm/rev and cutting speed of 30m/min. Stage 3 of the research focused on the benefits of UAD technique compared with the CD, initially on the first 5 hemp fibre/thermoplastic polycaprolactone (HF/PCL) composite specimens under similar drills, drilling parameters and condition. The results obtained show that UAD technique further confirmed and validated the optimal performance of specimen with AR of 19 (19-HF/PCL) composites, because of the minimum value of thrust force and machining time recorded, when compared with other aspect ratios and CD technique. The 19-HF/PCL laminate has maximum thrust force of 90N and 75N during UAD and CD respectively, which were the lowest force reduction at minimum drilling-induced damage, with the lowest machining time of 30 seconds for both. But comparatively, an improved drilled holes, optimal drilling and nearly 40 % of an average drilling forces (thrust and toque) reduction were recorded with UAD of hemp fibre/thermoset vinyl ester (HF/VE) composite specimens, when compared with both CD and HF/PCL specimens, respectively. Conclusively, the stage 4 addressed the theoretical aspect of this research through application of analytical method. Hence, in this last stage, an analytical thermo-mechanical model is proposed to predict critical feed rate and critical thrust force at the onset of delamination crack on CFRP composite cross-ply laminates, using the principle of linear elastic fracture mechanics (LEFM), laminated classical plate theory (LCPT), cutting mechanics and energy conservation theory. The delamination zone (crack opening Mode I)is modelled as an elliptical plate. The advantages of this proposed model over the existing models in literature are that the influence of drill geometry (chisel edge and point angle) on push-out delamination are incorporated, and mixed loads condition are considered. The forces on chisel edges and cutting lips are modelled as a concentrated(point) and uniformly distributed loads, resulting into a better prediction. The model is validated with models in the literature and the results obtained show the flexibility of the proposed model to imitate the results of existing models. Evidently, it can be summarily concluded that the quality of the drilled holes and total machinability of the FRP composites depend on the nature and properties of the composite specimens, drill designed geometry, drilling parameters, conditions and techniques.

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Silva, Duarte Nuno Rodrigues da. "Image processing methodology for assessment of drilling induced damage in CFRP." Master's thesis, Faculdade de Ciências e Tecnologia, 2013. http://hdl.handle.net/10362/9866.

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Dissertação para obtenção do Grau de Mestre em Engenharia Mecânica
Composite material components are produced in a near final shape. Machining operations such as drilling are often indispensable, namely for joining of structures. This process introduces damage along the periphery of the hole. Different methods to reduce this induced damage were developed. However, difficulties arise when comparing them since delamination is irregular in shape and in size. The delamination factor and the adjusted delamination factor quantify the damage but none achieved full acceptance since no international standards have been set. The aim of this work is to develop an image processing methodology associated with digital radiography that is capable of assessing the drilling induced damage in CFRP, being easily reproducible and allowing comparison of different drilling approaches. The subtraction of pre and post drill radiographies defined the target image to reach. In the image processing the threshold was found to be the most influential variable causing significant changes to the delamination factors. A new approach to the delamination factor is proposed in order to characterize the drilling induced damage. This approach allows the minimization of the quantified damage for the most irregular delamination shapes while equalling the current delamination factors for regular (crown like) damages.

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Li, Yongyi. "Drilling induced core damages and their relationship to crustal in situ stress states and rock properties." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq23018.pdf.

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Patrício, Luís Manuel Reis. "Evaluating the drilling induced damage in composite materials." Master's thesis, 2017. http://hdl.handle.net/10362/31301.

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Частини книг з теми "Drilling induced damage"

Clavijo, Johanna V., Leidy J. Roldán, Diego A. Castellanos, German A. Cotes, Ángela M. Forero, Camilo A. Franco, Juan D. Guzmán, Sergio H. Lopera, and Farid B. Cortés. "Double Purpose Drilling Fluid Based on Nanotechnology: Drilling-Induced Formation Damage Reduction and Improvement in Mud Filtrate Quality." In Lecture Notes in Nanoscale Science and Technology, 381–405. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-319-12051-5_11.

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Ismail, Sikiru Oluwarotimi. "Influence of Drill Geometry Design on Drilling-Induced Damage Reduction in Fiber-Reinforced Polymeric Composites." In Machining and Machinability of Fiber Reinforced Polymer Composites, 1–26. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-33-4153-1_1.

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Civan, Faruk. "Drilling-Induced Near-Wellbore Formation Damage." In Reservoir Formation Damage, 379–417. Elsevier, 2016. http://dx.doi.org/10.1016/b978-0-12-801898-9.00014-x.

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Civan, Faruk. "Drilling-induced near-wellbore formation damage: drilling mud filtrate and solids invasion and mud cake formation." In Reservoir Formation Damage, 415–56. Elsevier, 2023. http://dx.doi.org/10.1016/b978-0-323-90228-1.00004-2.

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"Rock strength obtained from core samples and borehole wall instabilities – the effect of drilling induced damage." In Rock Mechanics in Civil and Environmental Engineering, 351–54. CRC Press, 2010. http://dx.doi.org/10.1201/b10550-77.

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Тези доповідей конференцій з теми "Drilling induced damage"

Ballard, T. J., and R. A. Dawe. "Wettability Alteration Induced by Oil-Based Drilling Fluid." In SPE Formation Damage Control Symposium. Society of Petroleum Engineers, 1988. http://dx.doi.org/10.2118/17160-ms.

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Klungtvedt, Karl Ronny, Mahmoud Khalifeh, Arild Saasen, Bjørn Berglind, and Jan Kristian Vasshus. "Preventing Drilling Fluid Induced Reservoir Formation Damage." In SPE/IADC Middle East Drilling Technology Conference and Exhibition. SPE, 2021. http://dx.doi.org/10.2118/202187-ms.

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Abstract During drilling of permeable reservoirs, drilling fluid may penetrate the formation and induce damage to the reservoir rock. Specifically, solids present in the drilling fluid may enter the formation and cause subsequent reduction in reservoir permeability in the area near the wellbore. When drilling with a water-based drilling fluid in a reservoir, various polymer-based additives are normally applied to reduce the filtration loss. These additives, such as Xanthan Gum, Poly Anionic Cellulose (PAC) and Starch may help in reducing losses to the formation in presence of small pore-throats and low differential pressures. If the pore throats exceed e.g. 20μm and differential pressures reach 500psi, these additives have little effect on reducing loss of drilling fluid to the formation and thereby little effect in preventing solids from entering the formation. Lost circulation is particularly challenging when losses occur in the reservoir section. This is because LCM treatment may create formation damages. Green et al. (SPE-185889) showed the nature of drilling fluid invasion, clean-up, and retention during reservoir formation drilling. They also showed the lack of direct relation between fluid loss and formation damage. In light of such ideas, a development of new Non-Invasive Fluid (NIF) additives was conducted. These additives were able to handle downhole pressure differences and create a preventative sealing of a permeable formation when applied into a solids-free drilling fluid. Ceramic discs of various permeability and mean pore-throat size were installed into a HTHP pressure cell. Drilling fluid was pumped through the cell and a filter cake was formed across the ceramic disc. A pressure of 500psi was applied and filtration loss was measured over a 30-minute period. Examples are herein presented showing how filter cake materials were applied into the drilling fluid and effectively sealing the permeable surface of the ceramic disc. Also, it will be shown how the filter cake was effectively removed from the discs using a breaker solution. Furthermore, a selection of experiments is presented, showing the possibility to heal lost circulation in permeable reservoirs without the presence of weighing materials, clays or drill-solids in the drilling fluid. A test was also conducted in such a way that the disc was fractured inside the test cell to investigate the impact on fluid loss.

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Francis, Paul. "Dominating Effects Controlling the Extent of Drilling-Induced Formation Damage." In SPE European Formation Damage Conference. Society of Petroleum Engineers, 1997. http://dx.doi.org/10.2118/38182-ms.

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Ding, Yu, Gerard Renard, and Benjamin Herzhaft. "Quantification of Uncertainties for Drilling Induced Formation Damage." In Abu Dhabi International Petroleum Exhibition and Conference. Society of Petroleum Engineers, 2006. http://dx.doi.org/10.2118/100959-ms.

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Biswas, Deepankar, and P. V. Suryanarayana. "Estimating Drilling-Induced Formation Damage Using Reservoir Simulation to Screen Underbalanced Drilling Candidates." In SPE International Symposium and Exhibition on Formation Damage Control. Society of Petroleum Engineers, 2004. http://dx.doi.org/10.2118/86465-ms.

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Hattori, Junya, Yusuke Ito, Keisuke Nagato, and Naohiko Sugita. "Investigation of shock waves during ultrashort pulse laser drilling of SiC by combining pump-probe imaging with high-speed camera." In Laser-induced Damage in Optical Materials 2020, edited by Vitaly E. Gruzdev, Christopher W. Carr, Detlev Ristau, and Carmen S. Menoni. SPIE, 2020. http://dx.doi.org/10.1117/12.2570971.

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Francis, P. A., M. R. P. Eigner, and I. T. M. Patey. "Visualisation of Drilling-Induced Formation Damage Mechanisms using Reservoir Conditions Core Flood Testing." In SPE European Formation Damage Conference. Society of Petroleum Engineers, 1995. http://dx.doi.org/10.2118/30088-ms.

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Kishore Kumar, Panchagnula, and Panchagnula Jayaprakash Sharma. "Effect of Cutting Environments on Drilling Induced Damage in GFRP Nanocomposites." In ASME 2020 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/imece2020-23302.

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Abstract Drilling is most commonly used secondary machining process for structural joining of Glass Fiber Reinforced Plastic (GFRP) composites. Performing drilling operations on GFRPs/Multi-Walled CarbonNanoTubes (MWCNTs) reinforced GFRPs is really a challenging task due to their non-homogeneity and anisotropic behavior, which directs to generation of material damages. The prime focus of current work is to identify the suitable process parameters for enhancing the performance of drilling of GFRP nanocomposites. In this study, the drilling experiments are conducted on 0.3wt.% MWCNT-GFRP nanocomposites with solid carbide, TiCN and TiAlN coated drills (6mm diameter) under dry and chilled air cutting environments. The dry drilling experiments are conducted without any assistance of cooling fluid in ambient condition. The chilled air at a temperature of 3°C was supplied from the vortex tube. Experimental data is used for ANOVA (balanced) analysis. The cutting parameters such as feed rate, cutting speed and tool type (coating) are considered as input and the measured thrust force, delamination factor and AE RMS signal are treated as output responses. From ANOVA results, it is observed that the influence of feed rate is more on thrust force as compared to cutting speed. The coefficients of determination (R2) shows good fit between thrust force and cutting parameters and the corresponding confidence levels are above 98% for all cutting environments. Similarly, R2 values of delamination factor and AE RMS signals are above 90% and 96% respectively. The minimum thrust force and torque values are noted as 12.61 N and 0.152 N-m respectively at lower feed rate (10 mm/min) and higher cutting speed (1500 RPM) using TiCN coated drill under chilled air cutting environment. The delamination factor is also low (1.025) under the same cutting conditions of minimum cutting forces. A good correlation exists between the thrust force vs. delamination factor (> 0.85) and the delamination factor vs. AE RMS signal (> 0.80) for the selected cutting environments. The recommended range of RMS voltage is 0.083 to 0.121 volts for producing the delamination free holes on GFRP nanocomposites.

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Xiao, L., C. Piatti, D. Giacca, M. Bartosek, S. Nicula, and G. Gallino. "Studies on the Damage Induced by Drilling Fluids in Limestone Cores." In SPE International Symposium on Oilfield Chemistry. Society of Petroleum Engineers, 1999. http://dx.doi.org/10.2118/50711-ms.

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Field, D. J., A. J. Swarbrick, and G. A. Haduch. "Techniques for Successful Application of Dynamic Analysis in the Prevention of Field-Induced Vibration Damage in MWD Tools." In SPE/IADC Drilling Conference. Society of Petroleum Engineers, 1993. http://dx.doi.org/10.2118/25773-ms.

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Звіти організацій з теми "Drilling induced damage"

Guidati, Gianfranco, and Domenico Giardini. Joint synthesis “Geothermal Energy” of the NRP “Energy”. Swiss National Science Foundation (SNSF), February 2020. http://dx.doi.org/10.46446/publication_nrp70_nrp71.2020.4.en.

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Анотація:

Near-to-surface geothermal energy with heat pumps is state of the art and is already widespread in Switzerland. In the future energy system, medium-deep to deep geothermal energy (1 to 6 kilometres) will, in addition, play an important role. To the forefront is the supply of heat for buildings and industrial processes. This form of geothermal energy utilisation requires a highly permeable underground area that allows a fluid – usually water – to absorb the naturally existing rock heat and then transport it to the surface. Sedimentary rocks are usually permeable by nature, whereas for granites and gneisses permeability must be artificially induced by injecting water. The heat gained in this way increases in line with the drilling depth: at a depth of 1 kilometre, the underground temperature is approximately 40°C, while at a depth of 3 kilometres it is around 100°C. To drive a steam turbine for the production of electricity, temperatures of over 100°C are required. As this requires greater depths of 3 to 6 kilometres, the risk of seismicity induced by the drilling also increases. Underground zones are also suitable for storing heat and gases, such as hydrogen or methane, and for the definitive storage of CO2. For this purpose, such zones need to fulfil similar requirements to those applicable to heat generation. In addition, however, a dense top layer is required above the reservoir so that the gas cannot escape. The joint project “Hydropower and geo-energy” of the NRP “Energy” focused on the question of where suitable ground layers can be found in Switzerland that optimally meet the requirements for the various uses. A second research priority concerned measures to reduce seismicity induced by deep drilling and the resulting damage to buildings. Models and simulations were also developed which contribute to a better understanding of the underground processes involved in the development and use of geothermal resources. In summary, the research results show that there are good conditions in Switzerland for the use of medium-deep geothermal energy (1 to 3 kilometres) – both for the building stock and for industrial processes. There are also grounds for optimism concerning the seasonal storage of heat and gases. In contrast, the potential for the definitive storage of CO2 in relevant quantities is rather limited. With respect to electricity production using deep geothermal energy (> 3 kilometres), the extent to which there is potential to exploit the underground economically is still not absolutely certain. In this regard, industrially operated demonstration plants are urgently needed in order to boost acceptance among the population and investors.

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