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Well Loss in Fractured Rock Formation with Radial Flow during Pumping Test  

이철우 (한국지질자원연구원 환경지질연구부)
이대하 (한국지질자원연구원 환경지질연구부)
정지곤 (충남대학교 지질환경공학부)
김구영 (한국지질자원연구원 환경지질연구부)
김용제 (한국지질자원연구원 환경지질연구부)
Publication Information
Journal of Soil and Groundwater Environment / v.7, no.4, 2002 , pp. 17-23 More about this Journal
Abstract
Pumping tests were carried out from seven wells in fractured rocks. The time-drawdown data were obtained from pumping wells and corrected for the elapsed time of step drawdown test using Cooper-Jacob's method. A statistical method. the least square of error, was used to yield the coefficient of aquifer losses, the coefficient of well losses, and the power which indicates the severity of the turbulence. The values of the power range from 1.65 to 6.48. The well losses result mainly from turbulent flow caused by radial flow nearby pumping wells. The turbulent flow depends on Reynolds number. Since the hydraulic characteristics of fractured rocks control the fluid velocity, the value of the power is an important factor to understand the aquifer system of fractured rocks.
Keywords
Well loss; Fractured rocks; Step drawdown test; Method of the least square; Radial flow;
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