New geothermal drillbit This new Kaldera advanced roller cone bit is suited for geothermal and high-temperature drilling applications. Seals are made from fabric reinforced fluoroelastomer composites providing thermal stability and wear resistance. The company notes that a grease compound was developed from synthetic base oils and functional additives to increase load capacity at elevated temperatures to help ensure adequate lubricity of the bearing sealing system. Field trials of the bits demonstrated improvements in reliability over conventional roller cone drilbits, the firm reports. In a geothermal well in Italy, where temperatures can exceed 277o C., bits with the new sealing system...

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