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SPWLA Publications

Paper 1981 vXXIIn5a1 :: Add Item

"The second phase of the Hot Dry Rock (HDR) Geothermal Development Program at Fenton Hill, New Mexico, consists of two boreholes, directionally-drilled in a northeast direction, inclined at an angle of 35, with a vertical separation of 365 m (1200 ft). The two boreholes could be connected by 12 to 15 vertical parallel fractures to make a geothermal system calculated to produce 20 MW(e) for 20 years. Accurate temperature measurements, borehole caliper logs, and directional surveys are required for the successful completion and operation of this man-made reservoir system. Obtaining these data is extremely difficult because of the bottom hole static temperature of 335 C (635 F) at a depth of 4660 m (15,289 ft), the 35 deviation, the abrasive formation, and the presence of sticky drilling residue products. The efforts of Dresser-Atlas, Sperry-Sun, and the Geoscience Instrumentation Group of the Los Alamos National Laboratory during July, August, and September 1980, to obtain these data are described and discussed. The temperature logs and borehole directional survey produced realistic results, but the borehole caliper measurements were inconsistent and unreliable."