One of the most common production problems for the water well driller is, of course, heat. Above a certain temperature, metallurgy changes and drill pipe does strange things. Like get weaker. We have continuously improved the quality of our drill pipe to combat this heat, but it is still a never-ending battle. Another limiting factor, besides steel, is downhole tools. The electronics used in downhole navigation tools and wireline logging tools are notoriously fickle in perfect conditions, and a nightmare in hot holes.