Journal
ENERGY CONVERSION AND MANAGEMENT
Volume 45, Issue 9-10, Pages 1513-1527Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.enconman.2003.08.023
Keywords
geothermal well; well temperature distribution; drilling; circulation; surrounding formation; two phase flow
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This paper describes a comparative study of the thermal behaviour of drilling fluids and the surrounding rock when air-water mixtures and conventional muds are used as drilling fluids in geothermal wells. The computations were performed with two numerical simulators: TEMLOPI/V.2, which is used to compute the transient temperature disturbance when mud is employed, and GEOMIST, which is used when air-water mixtures are employed as drilling fluid. Data from a well from the Las Tres Virgenes Mexican geothermal field are used in this analysis. The results of simulation include temperatures computed during circulation and shut-in, and the latter results are compared with temperatures logged during drilling stoppages. It was found that the thermal disturbance caused by circulation of an air-water mixture has a smaller thermal effect than the thermal disturbance caused by drilling muds. (C) 2003 Elsevier Ltd. All rights reserved.
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