pH measurement in geothermal well

pH measurement is a important parameter in controlling the acidity of the geothermal fluid. A low pH indicates acid fluid, which might enhance the corrosion of the pipes. pH-meters are instruments calibrated at a temperature different from geothermal fluid, so the geothermal fluid must be cooled to the same calibration temperature of the pH-meter to get an accurate results.

pH measurement of the geothermal fluid in situ must be first cooled by passing the separated geothermal fluid through a cooling tubing surrounding by cold water. The cooled solution is collected in a container, where the pH-meter is introduced to measure its value.

Here is an illustration of this measurement.

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