Control of Corrosion and Scaling in Selected Geothermal Wells from Romania

Abstract

Aquifer fluid compositions have been determined by analysis made on water samples collected from production wells in Felix geothermal area from Romania. Data acquired was used in reservoir monitoring of the field to forecast chemical changes.

In order to assess the corrosion processes in exploitation equipments there were determined the corrosion rates, for geothermal waters from all the studied wells. By analysing the tests results, it was found out the necessity of using additives for corrosion at two of the wells. The present paper will indicate the studies performed with corrosion inhibitors, monitoring their efficiency.

The state of mineral saturation of the geothermal waters with respect to different minerals was studied by simulation program. Diffraction analysis was done for solid samples from the wells where scales were formed during utilization. They were made tests with additives, in static conditions, ones to check the good performance of additives to avoid deposition formation and a second method assumed to measure the change in pressure across a capillary tube in conditions of using different dosage of additives. The greater the time to reach an increase of pressure, the better the additive at controlling deposition.