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First EAGE/IGA/DGMK Joint Workshop on Deep Geothermal Energy
- Conference date: 08 Nov 2018 - 09 Nov 2018
- Location: Strasbourg, France
- ISBN: 978-94-6282-269-6
- Published: 08 November 2018
20 results
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An innovative Geothermal Well Architecture and Reservoir Evaluation Concept - the Cachan Subhorizontal Doublet
Authors P. Ungemach, M. Antics and M. DavauxThe present paper, further to a description of the subhorizontal well (SHW) architecture and accompanying geosteering drilling/navigation technology, focus on wireline logging, well testing and geochemical monitoring attributes of the reservoir assessment strategy.
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Multi-physics Imaging of a High Enthalpy Geothermal Field: the Darajat Case
Authors W. Soyer, R. Mackie, A. Pavesi, S. Hallinan and F. MiorelliMagnetotelluric (MT) measurements are of particular value in volcanic-hosted, high-enthalpy geothermal exploration, since electrical resistivity depends dramatically on the mineral composition of the hydrothermally altered rock, which is in turn a function of temperature. We present an integrated study from the Darajat geothermal field in West Java – a vapor-dominated field associated with an eroded andesitic stratovolcano, currently producing at 271MW capacity. Besides MT data, also gravity and micro-earthquake event data from seismic monitoring were incorporated in the workflow. A cross-gradient approach was followed in the joint inversions to structurally link the different domains. An additional cross-gradient link to porosity from a geological model was further used to promote structural similarity. The 3D joint inversion modeling resulted in mutually consistent resistivity, density and velocity models, in agreement with the current understanding of the field. We expect that similar joint inversion workflows employed both early in and during the lifetime of the field would strengthen the building of a concept model for exploration, and later updates guiding development drilling programs.
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Integrated Geophysical and Geological Workflow for Geothermal Exploration in Turkey
By F. CeciThe magnetotelluric method (MT), through imaging of the electrical resistivity in the subsurface, provides useful information regarding the geologic, compositional and hydraulic conditions of geothermal systems. Data-driven 3D MT modelling results were analyzed with geologic data to maximize the chance of success for geothermal exploration in West Anatolia, Turkey. 3D resistivity model from unconstrained modelling is interpreted with available geologic data to reconstruct geoelectrical basement geometry, identifying areas of differential subsidence due to a more segmented and compartmentalized sedimentary basin, or actual upwelling features related to an active geothermal field. Comparison with lithology extracted from a well within the survey showed a consistency between the data-driven resistivity distribution and the geology, thus increasing the confidence on the obtained results The possibility of having a geophysical methodology able to quickly identify main tectonic interpretable discontinuities is crucial to narrow the choices, locate the most promising geothermal prospects and make sound decisions in terms of drilling geothermal wells.
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3D Seismic High Productivity Application for Geothermal Development - Case Study in Suburban Environment (Munich Germany)
More LessRecent development in wireless recording technology together with a dramatic increase in the productivity derived from the O&G industry such as blended vibroseis acquisitions made the seismic surveys more attractive and in accordance with geothermal budgets. The increased quality due to a broadband recording makes a huge difference even with the most recent surveys. This paper presents the acquisition of the first 3D survey recorded in a suburban environment south of Munich (Germany) with such technology and for geothermal object.
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Overview of Technologies for Downhole Seismic for Geothermal Industry
Authors F. Percher and O. Valishinintroduction to ltest borehole seismic technologies used in oil & gas industries and can be applied to geothermal application, and how to optimize their use.
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Mud Hammer Drilling in Hard Formations: Bit Design Improvement Leads To Increased Rate of Penetration
Authors L. Gerbaud, R. Souchal and M. TarekPercussion drilling system, combining a mud hammer with drill bits, has been developed to increase drilling performances in hard formations. This system is based on a high-power down-the-hole hammer (Power output of 30 kW), capable of delivering high-energy impacts at high frequency (35 Hz) used with mud pressure as the power source. The drill bit is a key performance element because it is the one that is in contact with the rock and destroys it. It must be designed to optimize the cutting process. Numerous elementary tests of the insert-rock contact and the development of a model of the performances have been performed. It makes it possible to show the importance of the bit design parameters and the need to adapt the design to the drilling conditions. A new generation of bits optimized for performance has thus been developed and manufactured. The 6” mud hammer and the new drill bit have been then tested on a full scale drilling test bench. The performances comparison with roller cone bit showed an improvement of 100 to 300% of Rate of Penetration (ROP). The set was ultimately used in field drilling operations and validated the large improvement in ROP of 300%.
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Advances On Electro-Magnetic Imaging for De-Risking Enhanced Geothermal Systems Prospects
Authors M. Darnet, C. Dezayes, J. Girard, J. Baltassat, F. Bretaudeau, T. Reuschlé, N. Coppo, J. Porte and Y. LucasExploiting deep geothermal resources in rifts or in flexural basins to produce electricity is now possible because of the development of Enhanced Geothermal System (EGS) technology. To do so, the presence of fluid and sufficient permeability is necessary to allow the production and re-injection of the fluid. This translates into the reservoir being located in the deep layers of sedimentary basins and the upper part of the basement, including the transition zone between the two. The reality is however even more complex as the geothermal potential of this zone is also strongly influenced its hydrothermal and tectonic history. It is therefore clear that the characterization of this transition zone and its heterogeneity constitutes one of the most challenging problems for the development of geothermal resources. Within the frame of several national and European research projects, we have undertaken to develop geophysical techniques capable of imaging the electrical resistivity of the transition zone, as this physical parameter is highly sensitive to the presence of geothermal fluids and associated hydrothermal alterations. In this paper, we report out our analysis of core, well and field-scale resistivity measurements to establish the feasibility of electro-magnetic imaging for de-risking EGS prospects.
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Assessing the Potential of Abandoned Oil and Gas Wells for Geothermal Heat Recovery in France
Authors C. Maurel, V. Hamm and F. BugarelAround 12 000 boreholes have been listed in France according to an overview performed by INERIS (Lafortune, 2015, Lahaie and Bouffier, 2017). This paper describes the assessment study of abandoned oil and gas wells conversion for geothermal energy recovery. To that purpose, a multi-criteria analysis of key parameters is conducted to classify and grade wells according to their geothermal potential. The analysis accounts for surface information, parameters associated to the wells along with geological and geothermal properties (e.g. land use, existence of aquifers, temperature, transmissivity, depth reached, and drilling years). A case-by-case investigation is propose for a sample of high potential wells to ensure that all appropriate conditions are met to consider the conversion.
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Seismic Monitoring at Different Stages of Deep Geothermal Sites in the Upper Rhine Graben
Authors V. Maurer, A. Richard and N. CuenotThe induced seismicity recently observed in Rittershoffen and in Soultz-sous-Forêts highlights the need to perform a seismic monitoring, even during the exploitation phase of power plants, which is now explicitly required by the French mining authorities for getting the exploitation license.
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Wireline NMR Combined With Azimuthal Logs Define Flow Capacity and Homogeneity within High Angle Geothermal Well
Authors C. Cavalleri and E. WielemakerGeological, geophysical, geomechanical and petrophysical data gathering and analysis are important to manage Geothermal resources optimally. We highlight a case where a unique log combination was run to assess lateral homogeneity and flow potential in the target aquifer. A highly deviated well was drilled through a thin bed structure to characterize producing limestone layers within a carbonate sequence. The evaluation program included LWD nuclear data recorded while geosteering and Wireline NMR and advanced dipole sonic which were successfully tractor conveyed to verify the homogeneity of thin and highly porous and mobile diatomite and their performance. This was the first application of NMR logs to establish porosity and permeability in a Geothermal project. The NMR log results provided accurate information that complemented the sonic and density images adding critical knowledge of the mixed layers. Those logs integration helped to define the heterogeneity of target reservoirs, quantify critical rock parameters, and ability to transport the fluids. Azimuthal sonic data was explored adding to the overall understanding of different measurements and obtain a more detailed structural model. This also allowed to understand whether permeability variations were truly related to layer variations or a result of the measurements sensing properties of an adjacent layer.
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Integration of Wellbore Logs in a Multi-Disciplinary Geothermal Site Model: the Case of Rittershoffen, France
Authors G. Sosio, A. Mandiuc, A. Campana, R. Hehn, J. Vidal and C. BaujardAn extensive wireline logging campaign has been carried out in the Rittershoffen geothermal doublet in Eastern France. In particular, dipole sonic logs and wellbore image logs were acquired in the open hole over the target fractured aquifer. The interpretation of image logs allowed the characterization of the geometry (dip and azimuth) and the properties of the natural fracture network. The combination of density and sonic logs served as a base for geomechanical analysis. The near-wellbore results were then integrated and applied to the reservoir scale to build a 3D geological, hydrothermal and geomechanical model of the site.
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From Numerical Conceptual Models To Phenomenological Modelling and Production Optimization for Better Assessing Geothermal Reservoir Potential
Authors M. Garcia, J. Mathieu, D. Siffert and GEOTREF TeamAs part of the GEOTREF research project, a cost-effective approach, relying on innovative software tools, is proposed to carry out prefeasibility studies prior drilling based on numerical conceptual models associated with phenomenological modelling and well layout optimization. The numerical conceptual models are intended to be 3D structural, geological and geothermal numerical models that integrate at best all understanding, interpretations and data about the geothermal reservoir. They are defined at a scale where relevant boundary conditions can be specified, including recharge, basal heat flux and heat sources. Scenarios are used to formalize the uncertainty about numerical conceptual models, whether it is related to data values or interpretations, model assumptions or simplifications, or geothermal reservoir model components. Each scenario determines a numerical conceptual model as a possible representation of the actual geothermal reservoir. Phenomenological modelling is carried out by numerically simulating the geothermal systems corresponding to various scenarios. Results provide information to determine and understand the structural, geological and geothermal conditions that should be met to explain the presence of a geothermal resource. The geothermal potential of hot scenarios is then assessed by seeking optimal production and injection well locations that maximize the production of electrical power from the available geothermal energy.
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Assessment of CO2 Plume Geothermal (CPG) Systems
Authors S. Glos, M. Langer and M. WechsungCPG systems have been compared with conventional hydrothermal power plants based on thermodynamic simulation calculations. Especially at moderate reservoir depths and permeabilities, significant performance benefits for CO2 system were observed which validates the results from literature.Considering the surface power plant layout a less complex CO2 cycle with less equipment and a smaller footprint in comparison to brine based systems can be derived.
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Soultz and Rittershoffen Geothermal Plants in Upper Rhine Graben: Two Years of Operation
Authors G. Ravier, O. Seibel and J. MouchotAfter more than two years of successful commercial operation, Soultz and Rittershoffen geothermal plants give many lessons learned, which could be useful for the geothermal in Upper Rhine Graben.
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Experience Sharing Between the Petroleum and Geothermal industry: a Service Company's Perspective
Authors G. Sosio, B. Schrier, D. Thiolet, L. Masnaghetti, C. Cavalleri and J. de ReedeThe oil and gas industry has accumulated decades of experience characterizing and accessing deep and ultra-deep formations, including in challenging conditions which are commonly found in geothermal sites (high temperature, pressure, salinity, corrosion…). Oilfield service companies, in particular, have been developing innovative and efficient solutions to explore, map and produce these resources. Geophysical surveying, notably with electromagnetic methods, and integrated subsurface modeling in multi-disciplinary software platforms allow the characterization and quantification of the resource prior to drilling. Dedicated technologies for high pressure, high temperature drilling, including muds and bits, are used to realize highly deviated wellbores. Wellbore logging, either wireline or while drilling, provides the data to characterize the properties of the reservoir rock (porosity, permeability, presence of fractures) and to analyse well integrity. Production can be enhanced by stimulation treatments and by the installation of surface or downhole pumps. The combination of these services under a single provider may optimize the efficiency of well construction and resource characterization.
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Geothermal Gradients on Svalbard, Arctic Norway
Authors P. Betlem, K. Midttømme, M. Jochmann, K. Senger and S. OlaussenThe high Arctic archipelago of Svalbard, Norway, is considering to replace the currently operating coal-fuelled power plants. Besides local fossil energy sources such as coal or shale gas in combination with carbon storage and sequestration, renewable sources such as geothermal energy are being considered as alternatives. A thorough assessment of the geothermal energy alternative relies on precise knowledge of the current heat-flow values. In addition, paleo-temperature gradients, former basin configuration and basin development are of great importance for the evaluation of all of these energy sources. We assessed the lateral distribution of the heat-flow for systematically logged commercial petroleum exploration and research boreholes using numerical models. For the Central Tertiary Basin, models were constrained with multi-physical data sets. Geothermal gradients ranging from 25 to 55 °C/km (33 °C/km on average) have been recorded, and these support the indication of local and regional heat-flows that exceed the global continental average.
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Horizontal Stress Orientation and Fractures from Image Logs in Geothermal Boreholes in Fractured Carbonates in Switzerland
More LessThe assessment of the stress orientations is the first step for geomechanical modelling and for the understanding of the relationships between fractures, stress and fluid flow. Furthermore, an understanding of the stress regime and stress field orientation is crucial for optimizing planning of boreholes with a view to minimizing the risks. In the present publication, the results of a borehole image interpretation performed for the National Cooperative for the Disposal of Radioactive Waste (NAGRA) from a geothermal borehole in Northern Switzerland are presented. The borehole was drilled in Upper Jurassic carbonates that are partly intensively fractured and also contain vugs. It is shown that analysis and interpretation of borehole images contribute to a better understanding of reservoirs and that these data are important for efficient drilling and effective development of adjacent boreholes. The interpretation adds detail to the regional structural and present-day stress picture of the Upper Jurassic strata in the area. The main stress orientation matches results from nearby measurements. The fractures are potentially governed by local or regional structural elements, i.e. faults or folds.
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Hydrocarbon-Geothermal Co-Production: Worldwide Scale Status and Evaluation of the Techno-Economic Potential in Serbia
Authors E. Jeandel, M. Mecheri and D. RettenmaierHydrocarbon-geothermal co-production is an emerging opportunity for a wider development of geothermal energy. In the frame of the french-serbian GOSPEL program (Geothermal Serbian Pilot projects for Heat and Electricity), a state of the art of the synergies and challenges of co-production has been performed. The knowledge of co-production potential at worldwide scale remains limited, but numerous countries have started investigating this topic. On-going projects were mapped, revealing a large diversity of initiatives in regards to the geological settings, possible well configurations and thermal co-production capacities. Besides, the opportunities for hydrocarbon-geothermal co-production in Serbia were studied. Technologies suited to exploit the geothermal fluid and the recovered methane for heat or power production have been identified. Based on the available data of gas contents in geothermal fluids, areas of interest for co-production projects could be selected. Then, different scenarios were considered to assess the techno-economic potential of two sites, based on performance evaluation and a simplified economic model. The preliminary calculations showed that, in all scenarios, methane can be extracted and its combustion can be used for heat and electricity production. The geothermal fluid could also be exploited for heat or power production, depending on the geothermal resource quality and flow volume.
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Inhibitor Influence on Corrosion of Carbon Steel with Respect to the Upper Rhine Graben Geothermal Brines
Authors P. Huttenloch, R. Zorn, L. Makni, H. Steger, F. Schilling and D. RettenmaierCorrosion of construction materials in geothermal brine environments is of great concern in the long-term operation of geothermal power plants. In case of geothermal energy production there are many site-specific factors influencing corrosion processes e.g. high salinity, pH, high temperature, presence of non-condensable gases, fluid velocity, corrosion products, geometry of the power plant, acid treatment and acid cleaning procedures (Guerra & Jacobo 2012). To prolongate the lifetime and thus decrease downtime periods and economic losses, a careful material selection at acceptable costs is essential (Carter & Cramer 1992). Nogara & Zarrouk (2018b) summarized the results of 172 tested metals and alloys for the use in geothermal environment. Among low cost carbon steels, stainless steels, alloys and titanium are employed for functional parts as turbine blade or heat exchanger material respectively (e.g. Ravier et al. 2016). In geothermal power plants up to 12 types of corrosion may occur depending on the corrosiveness of the produced brine (e.g. Nogara & Zarrouk 2018a).
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