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Title: Geothermal well costs and their sensitivities to changes in drilling and completion operations

Abstract

A detailed analysis of the costs of drilling and completing geothermal wells is presented. The basis for much of the analysis is a computer-simulation-based model which calculates and accrues operational costs involved in drilling and completing a well. Geothermal well cost are discussed in general, with special emphasis on variations among different geothermal areas in the United States, effects of escalation and inflation over the past few years, and comparisons of geothermal drilling costs with those for oil and gas wells. Cost differences between wells for direct use of geothermal energy and those for electric generation are also indicated. In addition, a breakdown of total well cost into its components is presented. This provides an understanding of the relative contributions of different operations in drilling and completions. A major portion of the cost in many geothermal wells is from encountered troubles, such as lost circulation, cementing difficulties, and fishing. These trouble costs are considered through both specific examples and statistical treatment of drilling and completions problems. The sensitivities of well costs to variations in several drilling and completion parameters are presented. The model makes it possible to easily vary parameters such as rates of penetration; bit lifetimes; bit, rental, ormore » rig costs; delay times; number of cement plugs; etc. The effects of these variations on different types of geothermal wells are compared.« less

Authors:
;
Publication Date:
Research Org.:
Sandia National Lab., Albuquerque, NM
OSTI Identifier:
7369361
Report Number(s):
SAND-81-0036C; CONF-810105-
Resource Type:
Conference
Resource Relation:
Conference: International geothermal drilling and completions technology conference, Albuquerque, NM, USA, 21 Jan 1981; Related Information: In: Proceedings of the international conference on geothermal drilling and completion technology, by
Country of Publication:
United States
Language:
English
Subject:
15 GEOTHERMAL ENERGY; GEOTHERMAL WELLS; COST; DRILLING EQUIPMENT; ECONOMIC ANALYSIS; WELL COMPLETION; WELL DRILLING; DRILLING; ECONOMICS; EQUIPMENT; WELLS; Geothermal Legacy; 150901* - Geothermal Engineering- Drilling Technology & Well Hardware

Citation Formats

Carson, C.C., and Lin, Y.T. Geothermal well costs and their sensitivities to changes in drilling and completion operations. United States: N. p., 1981. Web.
Carson, C.C., & Lin, Y.T. Geothermal well costs and their sensitivities to changes in drilling and completion operations. United States.
Carson, C.C., and Lin, Y.T. Thu . "Geothermal well costs and their sensitivities to changes in drilling and completion operations". United States.
@article{osti_7369361,
title = {Geothermal well costs and their sensitivities to changes in drilling and completion operations},
author = {Carson, C.C. and Lin, Y.T.},
abstractNote = {A detailed analysis of the costs of drilling and completing geothermal wells is presented. The basis for much of the analysis is a computer-simulation-based model which calculates and accrues operational costs involved in drilling and completing a well. Geothermal well cost are discussed in general, with special emphasis on variations among different geothermal areas in the United States, effects of escalation and inflation over the past few years, and comparisons of geothermal drilling costs with those for oil and gas wells. Cost differences between wells for direct use of geothermal energy and those for electric generation are also indicated. In addition, a breakdown of total well cost into its components is presented. This provides an understanding of the relative contributions of different operations in drilling and completions. A major portion of the cost in many geothermal wells is from encountered troubles, such as lost circulation, cementing difficulties, and fishing. These trouble costs are considered through both specific examples and statistical treatment of drilling and completions problems. The sensitivities of well costs to variations in several drilling and completion parameters are presented. The model makes it possible to easily vary parameters such as rates of penetration; bit lifetimes; bit, rental, or rig costs; delay times; number of cement plugs; etc. The effects of these variations on different types of geothermal wells are compared.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Jan 01 00:00:00 EST 1981},
month = {Thu Jan 01 00:00:00 EST 1981}
}

Conference:
Other availability
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