ESO test

In order to maintain the soda production in Bernburg, which has existed for over 130 years and is made possible by Solvay Chemicals GmbH with its approximately 400 employees at the Bernburg site, UGS GmbH has been awarded a contract to drill two further brine extraction wells.
The UGS drilling rig T-12 was set up at the Gnetsch 208 site in mid-September. This was followed by a capacity-related interruption of two weeks before operational work began on 4 October.

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The first section was drilled in a 20″ profile to a depth of 322 m. The subsequent borehole measurement showed that the well diameter was sufficient throughout so that it was possible to install the 16″ anchor tube. At 242 m, the pipe run encountered resistance, and it was not possible to drive it to the planned final depth. It therefore had to be removed again. The most likely cause of the impassable borehole is considered to be the anhydrite, which presumably swelled into the well and was therefore no longer passable. After an additional cleaning pass with the 20″ drilling set, the anchor tube was successfully installed and cemented. A 14 ¾″ drilling set was then used for drilling. The cavern neck area (i.e. the area from the last cemented pipe to the cavern) was cored with an 8 ½″ set for geological recording. In Bernburg, there are some marker horizons known to have a defined distance to the lower edge of the Zechstein salt formation. This six-fold striation must be recorded with cores so that the final depth of the well can be determined. Based on the geological profile, the well was initially planned to be 712 m deep but was then be drilled to 717 m because of the unexpectedly deeper five-fold striation encountered.