Drill pin failure-analysis report [electronic resource].
- Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 1980.
- Physical Description:
- Pages: 15 : digital, PDF file
- Additional Creators:
- United States. Department of Energy. Office of Scientific and Technical Information
- Restrictions on Access:
- Free-to-read Unrestricted online access
- A cracked drill pin was received from ENEL's Sasso 22 geothermal well with a request for failure analysis. Failure reportedly occurred during temperature measurements inside the drill pipe. This drill pipe had been put into the 4000 meter (13,124 ft.) hole for instrument protection about 80 hours before temperature measurements. The temperature measured at the bottom of the hole was 380/sup 0/C (716/sup 0/F). The liquid level was at 2000 meters (6562 feet) depth, and the temperature at that depth was 95/sup 0/C (203/sup 0/F). Information on the depth where failure of this pin occurred was not given. Numerous drill string failures of this type have been reported at depths greater than 3000 meters (9843 feet) by ENEL. A mixture of 70% river water and 30% condensate from a nearby geothermal power plant was being used as drilling fluid. The average chemical composition of the power plant wastewater is given. This region of Italy is known as the Boraciferous Region. The average chemistry of the Boraciferous geothermal fluid is given. The failed drill pin was reportedly made of 38 NC D4 steel.
- Report Numbers:
- E 1.99:doe/et/27026-t3
- Published through SciTech Connect.
Radian Corp., Austin, TX (USA)
- Funding Information:
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