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Geothermal drilling and completion: Difference between revisions
→Nature of geothermal formations
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== | ==Geothermal formations== | ||
Typical rock types in geothermal reservoirs include: | Typical rock types in geothermal reservoirs include: | ||
*Granite | * Granite | ||
*Granodiorite | * Granodiorite | ||
*Quartzite | * Quartzite | ||
*Greywacke | * Greywacke | ||
*Basalt | * Basalt | ||
*Volcanic tuff | * Volcanic tuff | ||
Compared to the sedimentary formations of most oil/gas reservoirs, geothermal formations are, by definition: | Compared to the sedimentary formations of most oil/gas reservoirs, geothermal formations are, by definition: | ||
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*Underpressured | *Underpressured | ||
*Often contain corrosive fluids | *Often contain corrosive fluids | ||
*Some formation fluids have very high solids content<nowiki>[</nowiki> | *Some formation fluids have very high solids content <nowiki>[</nowiki>total dissolved solids (TDS) in some Imperial Valley brines is above 250,000 ppm<nowiki>]</nowiki> | ||
total dissolved solids (TDS) in some Imperial Valley brines is above 250,000 ppm | |||
<nowiki>]</nowiki> | |||
These conditions mean that drilling is usually difficult, with problems that include: | These conditions mean that drilling is usually difficult, with problems that include: | ||