Jökull


Jökull - 01.12.1987, Page 20

Jökull - 01.12.1987, Page 20
TABLE 2 DATA ON BOREHOLES IN KRAFLA. CEMENTED CASINGS -------..... -............ LINER Well nr Drilled year Depth (m) Diam. n Depth (m) Diam. C) Depth (m) Diam. (”) Depth interval (m) KW-l 1974 1138 14 79 8% 296 6% 285-1135 KW-2 1974 1204 14 80 8% 298 6% 284-1183 KG-3 1975 1740 i3-y« 114 9% 604 7% 584-1671 KJ-3A 1983 985 13% 336 KJ-3A 1984 9% 302-663 KG-4 1975 2002 13| 114 9% 594 KG-5 1975 1299 13% 114 9% 643 KJ-6 1976 2000 13% 142 9% 576 7% 491-1933 KJ-7 1976 2165 13% 276 9% 808 7% 715-2101 KJ-7 1977 1% 187 KG-8 1976 1658 13 K 142 9% 537 7% 517-1646 KJ-9 1976 1101 13Vs 275 7% 251-1100 KJ-9 1977 1263 9% 1074 7% 1062-1259 KJ-9 1982 1280 7% 1063-1274 KG-10 1976 2082 13% 275 9% 805 7% 775-2060 KJ-11 1976 2217 13% 275 9% 788 7% 754-2194 KJ-11 1978 7% 766-1250 7% 1290-2194 KG-12 1978 2222 13% 283 9% 985 7% 959-2220 KJ-13 1980 2050 13% 284 9% 1064,5 7% 1028-2037 KJ-13 1983 1780 7% 870-1706 KJ-14 1980 2107 13% 210 9% 705 7 1527-2099 KJ-15 1980 2097 13% 295 9% 1093 7 1054-2097 KJ-16 1981 1981 13% 206 9% 669 7 1836-1951 KJ-17 1981 2190 13% 206 9% 692 7% 642-1964 KJ-18 1981 2215 13% 200 9% 669 KJ-19 1982 2150 13% 200 9% 649 7 495-2009 KJ-20 1982 1823 13% 211 9% 646 7 604-1770 KJ-21 1982 1200 13% 286 7 240-1170 KJ-21 1984 9% 273 9% 273-1043 KJ-22 1983 1877 13% 155 9% 565 7 522-1850 KJ-23 1983 1968 13% 190,5 9% 536 Leirbotnar field, which is the largest geothermal field within the Krafla caldera. Altogether 24 wells (>1000 m) have been drilled in the three different well fields in Krafla. The basic design statistics of the wells are summarized in Table 2. The typical Krafla well is cased with a 13 3/8” anchor casing to 200-300 m depth and production casing to 600-1100 m depth. The production part is drilled with an 8 1/2” drillbit to about 2000 m depth and cased with a 7” slotted liner. FIELD CHARACTERISTICS The production characteristics of the three well fields at Krafla differ widely as is apparent when simplified temperature /depth profiles for them are compared (Fig 7). The Leirbotnar field is divided into two distinct reservoir zones. The upper zone which extends down to approximately 1 km depth is water saturated with a mean temperature of 205°C. The temperature of the lower zone below 1 km depth is in excess of 300°C and boiling conditions extend below 2 km depth where the temperature is 350°C. The upper zone vanishes at the Hveragil gully and to the east in the Suðurhlíðar field a boiling reservoir extends from the surface down to at least 2 km depth. In the Hvíthólar field a boiling system extends from the surface down to 700 m depth but below 18
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