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Ground Water Pollution
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acid application aquifer bacteria bentonite bit weight borehole cable-tool cable-tool drilling caliper logs carbonate cement chemical chlorine circulation clay construction contamination core corrosion cost cuttings depth determined diameter dolomite drill pipe drill string drillability drilling fluid drilling methods drilling mud drilling rate drilling systems economic effective efficiency EQUATION equipment factors feet field Figure flow formation fractures gallons gamma geophysical logs gravel pack ground water industry grout hole horsepower hydraulic inches increase incrustation installation logs material measured mineral neutron operations particles penetration rate percent permeability petroleum industry plug porosity potential pressure problems produced properties pump reduced relatively resistivity rock rotary drilling rotary speed samples sand sandstone screen seal shale shallow slurry solution specific capacity strength surface techniques temperature tion tool turbine turbodrill unconsolidated velocity viscosity water table water well industry water-bearing yield zone