Built by a geologist

Lugeon and Packer Test Calculator

Calculate normalized rock-mass water take for one stabilized water-pressure or packer-test stage. One Lugeon represents one litre per minute per metre of tested interval at an effective injection pressure of one megapascal. The arithmetic is Lu = Q divided by L times 1 MPa divided by P , where Q is stabilized injection flow, L is the isolated open test-section length, and P is effective pressure at that interval. For example, 10 litres per minute through a 5 metre interval at 0.5 MPa gives 4 Lu. GeoMiner converts pressure from megapascals, kilopascals, bar, pounds per square inch, or kilogram-force per square centimetre; flow from litres per minute, U.S. gallons per minute, or cubic metres per hour; and length from metres or feet. It reports the converted effective pressure, flow and length, water take per metre at the entered pressure, equivalent total flow at 1 MPa, and optional approximate stage volume. The optional volume is flow multiplied by duration; it is not a leakage correction or stored-water analysis. Enter effective pressure at the test interval, not an uncorrected surface-gauge value. Hydrostatic head above the interval, groundwater head, gauge elevation, tubing and fitting losses, equipment configuration, and the governing sign convention can change effective pressure. GeoMiner deliberately does not infer those corrections because field procedures and apparatus differ. Apply the approved method outside the calculator, document every term, and preserve both raw gauge and corrected interval pressure. Use the representative stabilized flow required by the governing procedure. Preserve time-series pressure and flow observations, increasing and decreasing pressure stages, repeated stages, packer inflation and seating records, leak checks, borehole and interval geometry, water level, equipment calibrations, injection-water condition, drilling and cleaning history, geology, core log, fracture observations, losses, anomalies, uncertainty, and reviewer. The open interval is not automatically total hole depth, core-run length, or nominal packer spacing. One normalized value hides pressure-flow behaviour. A sequence can indicate laminar response, turbulence, erosion or washout, filling or clogging, joint dilation, or hydrofracturing. High pressure can open fractures or alter the rock mass; approved limits and competent field supervision are essential. Th