| 摘要 |
PURPOSE: An evaluation method of high or low permeability of a fractured rock aquifer using a well head loss term from a step drawdown test is provided to identify a primary aquifer section in wells and compare the status of a high or low permeability section. CONSTITUTION: An evaluation method of high or low permeability comprises the steps of: obtaining drawdown depending on the elapsed time of a pumping rate by stages through the step drawdown test of a pumping well (S10); obtaining an optimal aquifer well head loss coefficient (B), an optimal well head loss coefficient (C), and an optimal well head loss exponent (P) from the obtained drawdown (S30); and identifying the relation between the C and P of a well head loss from the drawdown equation of a step drawdown test, dividing a linear flow section and a turbulent flow section, and estimating an adiabatic permeability flow (S40). [Reference numerals] (AA) Stepwise drawdown test; (BB) High-permeability flow; (CC) Low-permeability flow; (DD) Very high-permeability flow; (S10) Measure the drawdown levels depending increases of a pumping rate by stages; (S20) Obtain optimal well coefficients (B, C, and P) by applying the equation of S_W = BQ + CQ^P using the method of least squares; (S30) Determine the optimal well coefficients (B, C, and P) from the equation of S_W = BQ + CQ^P; (S40) Estimating an high/low adiabatic permeability flow using the relation between C and P in a well loss coefficient CQ^P |
