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Title: Geothermal Drilling in Cerro Prieto

To date, 71 geothermal wells have been drilled in Cerro Prieto. The activity has been divided into several stages, and, in each stage, attempts have been made to correct deficiencies that were gradually detected. Some of these problems have been solved; others, such as those pertaining to well casing, cement, and cementing jobs, have persisted. The procedures for well completion--the most important aspect for the success of a well--that were based on conventional oil well criteria have been improved to meet the conditions of the geothermal reservoir. Several technical aspects that have improved should be further optimized, even though the resolutions are considered to be reasonably satisfactory. Particular attention has been given to the development of a high-temperature drilling fluid capable of being used in drilling through lost circulation zones. Conventional oil well drilling techniques have been used except where hole-sloughing is a problem. Sulfonate lignitic mud systems have been used with good results. When temperatures exceed 300 C (572 F), it has been necessary to use an organic polymer to stabilize the mud properties.
Authors:
;
Publication Date:
OSTI Identifier:
886089
Report Number(s):
SAND-81-0036C; CONF-810105-2
TRN: US200616%%965
DOE Contract Number:
AC04-76DP00789
Resource Type:
Conference
Resource Relation:
Conference: International Geothermal Drilling and Completions Technology Conference, Albuquerque, NM, USA, 21 Jan 1981
Research Org:
DOEEEGTP (USDOE Office of Energy Efficiency and Renewable Energy Geothermal Tech Pgm)
Country of Publication:
United States
Language:
English
Subject:
02 PETROLEUM; 15 GEOTHERMAL ENERGY; CEMENTING; DRILLING; DRILLING FLUIDS; GEOTHERMAL WELLS; LOSSES; OIL WELLS; ORGANIC POLYMERS; SULFONATES; WELL CASINGS Geothermal Legacy