Geothermal drilling problems and their impact on cost

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Historical data are presented that demonstrate the significance of unexpected problems. In extreme cases, trouble costs are the largest component of well costs or severe troubles can lead to abandonment of a hole. Drilling experiences from US geothermal areas are used to analyze the frequency and severity of various problems. In addition, average trouble costs are estimated based on this analysis and the relationship between trouble and depth is discussed. The most frequent drilling and completion problem in geothermal wells is lost circulation. This is especially true for resources in underpressured, fractured formations. Serious loss of circulation can occur during ... continued below

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Pages: 18

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Carson, C.C. January 1, 1982.

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Description

Historical data are presented that demonstrate the significance of unexpected problems. In extreme cases, trouble costs are the largest component of well costs or severe troubles can lead to abandonment of a hole. Drilling experiences from US geothermal areas are used to analyze the frequency and severity of various problems. In addition, average trouble costs are estimated based on this analysis and the relationship between trouble and depth is discussed. The most frequent drilling and completion problem in geothermal wells is lost circulation. This is especially true for resources in underpressured, fractured formations. Serious loss of circulation can occur during drilling - because of this, the producing portions of many wells are drilled with air or aerated drilling fluid and the resulting corrosion/erosion problems are tolerated - but it can also affect the cementing of well casing. Problems in bonding the casing to the formation result from many other causes as well, and are common in geothermal wells. Good bonds are essential because of the possibility of casing collapse due to thermal cycling during the life of the well. Several other problems are identified and their impacts are quantified and discussed.

Physical Description

Pages: 18

Notes

NTIS, PC A02/MF A01.

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  • 3. AAPG circum-Pacific Energy and Materials conference, Honolulu, HI, USA, 22 Aug 1982

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  • Report No.: SAND-82-0261C
  • Report No.: CONF-820834-3
  • Grant Number: AC04-76DP00789
  • Office of Scientific & Technical Information Report Number: 5045152
  • Archival Resource Key: ark:/67531/metadc1058531

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • January 1, 1982

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  • Jan. 22, 2018, 7:23 a.m.

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  • Feb. 2, 2018, 1:20 p.m.

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Carson, C.C. Geothermal drilling problems and their impact on cost, article, January 1, 1982; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc1058531/: accessed November 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.