By A. Strub (auth.), A. S. Strub, P. Ungemach (eds.)

The first drawback in power costs was once definitely a robust stimulus for the involvement of the fee of the eu groups in learn and improvement on replacement strength resources. certainly, the necessity to triumph over problems confronted through the group as an entire, really these caused by its seriously unbalanced strength offer, made a standard neighborhood procedure look in particular apt. This reasoning additionally applies to power R&D, taking into consideration that responses to the obstacle will be not just political or fiscal, but additionally clinical. 4 years have handed because the determination of the Council of Ministers to release the 1st group strength examine and improvement Programme, facing geothermal strength, solar power, hydrogen construction and utili­ sation, strength conservation and effort structures research. A seminar on geo­ thermal power was once held years in the past to record on paintings in development on the half-way degree of the four-year programme. the second one foreign seminar, said during this quantity, used to be arrang­ ed in order to provide a chance to check the ultimate final result of this neighborhood funding in examine in geothermal power. This complaints quantity for this reason has major goals: - to provide an evaluate of the result of the group geothermal programme, by way of eighty three formal reviews describing the person study programmes; - to teach how the group examine programme suits into the final context of nationwide and foreign examine on geothermal strength, through together with the shows of six visitor audio system who brought the periods and gave keynote addresses.

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Extra resources for Advances in European Geothermal Research: Proceedings of the Second International Seminar on the Results of EC Geothermal Energy Research, held in Strasbourg, 4–6 March 1980

Example text

Larderello was considered a freak of nature, something exceptional and hence too unusual to merit costly prospecting. A third reason was the extremely low price of oil and a fourth reason, the relative ease of building thermal power stations at any location. A geothermal power station on the other hand, can be located only at the site where productive drilling is possible: why then hunt everywhere for hypothetical hot water when it's so easy to build an oil-fired power station anywhere one wanted with fuel costs (then) so low?

The first expLoits the particuLar texture of granite: seLective dissolution of the silicates resuLts in a seLf-propped fracture which obviates the need to circuLate a heat transfer fluid at high pressure. The second results from cooLing the rock and is a method whereby, theoreticaLLy, a fracturing network perpendicular to the hydraulic fracture -32- is deveLoped as a resuLt of the tensiLe stresses due to contraction of the rock voLume. ThermaL cooLing is currentLy used for the stimuLation of geothermaL weLLs in IceLand and New ZeaLand in rocks which however exhibit some porosity.

C) a technology which uses explosives to pretreat the rock so that full potential hydraulic fracturing can be achieved. The strong anisotropy of the mechanical stresses resulting from the discontinuities in the rock can be overcome by developing the self-propped radial fracture array; independently of the stress field close to the well. Reservoir specialists would call this a strong negative skin effect zone from which hydraulic fracturing would send out fractures in the hope that the natural discontinuities in the rock could be re-opened and interconnected.

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Advances in European Geothermal Research: Proceedings of the by A. Strub (auth.), A. S. Strub, P. Ungemach (eds.)
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