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Title: Advanced Geothermal Turbodrill

Abstract

Approximately 50% of the cost of a new geothermal power plant is in the wells that must be drilled. Compared to the majority of oil and gas wells, geothermal wells are more difficult and costly to drill for several reasons. First, most U.S. geothermal resources consist of hot, hard crystalline rock formations which drill much slower than the relatively soft sedimentary formations associated with most oil and gas production. Second, high downhole temperatures can greatly shorten equipment life or preclude the use of some technologies altogether. Third, producing viable levels of electricity from geothermal fields requires the use of large diameter bores and a high degree of fluid communication, both of which increase drilling and completion costs. Optimizing fluid communication often requires creation of a directional well to intersect the best and largest number of fracture capable of producing hot geothermal fluids. Moineau motor stators made with elastomers cannot operate at geothermal temperatures, so they are limited to the upper portion of the hole. To overcome these limitations, Maurer Engineering Inc. (MEI) has developed a turbodrill that does not use elastomers and therefore can operate at geothermal temperatures. This new turbodrill uses a special gear assembly to reduce the outputmore » speed, thus allowing a larger range of bit types, especially tri-cone roller bits, which are the bits of choice for drilling hard crystalline formations. The Advanced Geothermal Turbodrill (AGT) represents a significant improvement for drilling geothermal wells and has the potential to significantly reduce drilling costs while increasing production, thereby making geothermal energy less expensive and better able to compete with fossil fuels. The final field test of the AGT will prepare the tool for successful commercialization.« less

Authors:
Publication Date:
Research Org.:
USDOE Idaho Operations Office, Idaho Falls, ID; Maurer Engineering, Inc., Houston, TX (US)
Sponsoring Org.:
USDOE Office of Geothermal Technologies (EE-12) (US)
OSTI Identifier:
765115
Report Number(s):
DOE/ID/13680
TRN: AH200102%%432
DOE Contract Number:  
FG07-98ID13680
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 1 May 2000
Country of Publication:
United States
Language:
English
Subject:
15 GEOTHERMAL ENERGY; 03 NATURAL GAS; GEOTHERMAL ENERGY; GEOTHERMAL FIELDS; GEOTHERMAL FLUIDS; GEOTHERMAL POWER PLANTS; GEOTHERMAL RESOURCES; GEOTHERMAL WELLS; IGNEOUS ROCKS; METAMORPHIC ROCKS; NATURAL GAS WELLS; TURBODRILLS; Geothermal Legacy; POWER PLANT; CRYSTALLINE ROCK FORMATIONS; DOWNHOLE TEMPERATURE; FLUID COMMUNICATION; DIRECTIONAL WELL; FRACTURES; HOT GEOTHERMAL FLUIDS; ELASTOMERS; TURBODRILL

Citation Formats

W. C. Maurer. Advanced Geothermal Turbodrill. United States: N. p., 2000. Web. doi:10.2172/765115.
W. C. Maurer. Advanced Geothermal Turbodrill. United States. doi:10.2172/765115.
W. C. Maurer. Mon . "Advanced Geothermal Turbodrill". United States. doi:10.2172/765115. https://www.osti.gov/servlets/purl/765115.
@article{osti_765115,
title = {Advanced Geothermal Turbodrill},
author = {W. C. Maurer},
abstractNote = {Approximately 50% of the cost of a new geothermal power plant is in the wells that must be drilled. Compared to the majority of oil and gas wells, geothermal wells are more difficult and costly to drill for several reasons. First, most U.S. geothermal resources consist of hot, hard crystalline rock formations which drill much slower than the relatively soft sedimentary formations associated with most oil and gas production. Second, high downhole temperatures can greatly shorten equipment life or preclude the use of some technologies altogether. Third, producing viable levels of electricity from geothermal fields requires the use of large diameter bores and a high degree of fluid communication, both of which increase drilling and completion costs. Optimizing fluid communication often requires creation of a directional well to intersect the best and largest number of fracture capable of producing hot geothermal fluids. Moineau motor stators made with elastomers cannot operate at geothermal temperatures, so they are limited to the upper portion of the hole. To overcome these limitations, Maurer Engineering Inc. (MEI) has developed a turbodrill that does not use elastomers and therefore can operate at geothermal temperatures. This new turbodrill uses a special gear assembly to reduce the output speed, thus allowing a larger range of bit types, especially tri-cone roller bits, which are the bits of choice for drilling hard crystalline formations. The Advanced Geothermal Turbodrill (AGT) represents a significant improvement for drilling geothermal wells and has the potential to significantly reduce drilling costs while increasing production, thereby making geothermal energy less expensive and better able to compete with fossil fuels. The final field test of the AGT will prepare the tool for successful commercialization.},
doi = {10.2172/765115},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2000},
month = {5}
}