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The maximum applicable well depth of a 9 5/8 in pipe base screen depends on base pipe grade, wall thickness, connection type, and downhole load conditions, rather than diameter alone.Under standard water well or oil & gas sand control conditions, a properly designed 9 5/8 in pipe base screen is commonly used in wells ranging from 300 m to 1500 m, and can be extended deeper with reinforced design. Final depth capability should always be confirmed by design calculations with appropriate safety factors, considering temperature, fluid density, and well deviation.