Geothermal observation wells, Mt. Hood, Oregon. Final report, October 4, 1977-July 9, 1979
Exploration drilling operations were conducted which included the deepening of an existing hole, designated as Old Maid Flat No. 1, from 1850 ft (564 m) to 4002 (1220 m) on the western approaches to Mt. Hood and the drilling of three new holes ranging from 940 ft (287 m) to 1340 ft (409 m). The Clear Fork hole, located in Old Maid Flat, was drilled to 1320 ft (402 m). The Zigzag hole was drilled to 940 ft (287 m) at the southwestern base of Mt. Hood in the Zigzag River valley. The remaining hole was drilled on the Timberline Lodge grounds which is on the south flank of Mt. Hood at an elevation of about 6000 ft (1829 m) above sea level. The deepening project designated as Old Maid Flat No. 1 encountered a maximum bottom hole temperature of about 180/sup 0/F (82/sup 0/C) and is to this date the deepest exploratory hole in the Mt. Hood vicinity. No significant drilling problems were encountered. The Clear Fork and Zigzag River holes were completed without significant problems. The Timberline Lodge hole encountered severe drilling conditions, including unconsolidated formations. Two strings of tools were left in the hole from structural collapse of the hole. The hole was scheduled as a 2000 ft (610 m) test. Drilling did not proceed beyond 1350 ft (412 m) and due to junk it was unobstructed to a depth of 838 ft (255 m). Observation pipe was installed to 735 ft (224 m) due to further disintegration of the hole. The work was prematurely terminated due to weather conditions.
- Research Organization:
- Northwest Geothermal Corp., Portland, OR (USA)
- DOE Contract Number:
- ET-78-C-08-1565
- OSTI ID:
- 5357782
- Report Number(s):
- DOE/ET/28417-1
- Country of Publication:
- United States
- Language:
- English
Similar Records
Interpretation of shallow electrical features from electromagnetic and magnetotelluric surveys at Mount Hood, Oregon
Mt. Hood geothermal exploratory drilling and testing plan. Old Maid Flat holes No. 1 and No. 7A