Well “St Sample Clauses

Well “St. Gallen GT-1” The well St. Gallen GT-1 reached 4450 m MD with four drill sections (23’’ to 8 ½’’ drill bits and 18 5/8’’ to 7’’ casing, last as perforated liner) in 2013 and has been temporarily shut-in after the final results of the testing campaign (see development of the project) proved only a small productivity for water, a high short-term productivity for natural gas, and a high seismic risk (max. ML 3.5 in 07/2013). The well has a four-barrier completion. A permanent packer (first barrier) locks in the gas- water reservoir below 3970 m MD (section four; open hole section with initially about 370 bar formation pressure @ 145 degrees Celsius). A retrievable bridge plug within the cased part of the well at about 3700 m MD forms the second barrier. The wellhead at the top of the well seals off the structure towards the surface (third barrier). Conservation fluid (water with anti- corrosives) fills up all cased hole-sections and is manually pressure monitored from surface at the wellhead (0 bars wellhead pressure proven since shut-in in 2013 throughout today; pressure readings and quality check of well from surface once a week). The schematic well completion and stratigraphy is shown in Figure 2.