| Bertha Rogers Borehole | |
| Coordinates: | [1] |
| Place: | Burns Flat, Dill City, Oklahoma, US |
| Subdivision Type: | State |
| State/Province: | Oklahoma |
| Country: | US |
| Products: | Natural Gas |
| Type: | Gas Well |
| Greatest Depth: | 31441feet |
| Opening Year: | 1974 |
| Closing Year: | 1997 |
| Owner: | Lone Star Producing Company |
The Bertha Rogers Borehole is a former natural gas well in Burns Flat, Dill City, Oklahoma, US. Today plugged and abandoned, it was originally drilled by the Lone Star Producing Company as its oil-exploratory hole number 1–27 between October 25, 1972 and April 13, 1974, reaching a then world record terminal depth of 31441feet.[2]
During drilling, the well encountered enormous pressure – almost 25,000 psi (172,369 kPa). No commercial hydrocarbons were found before drilling hit a molten sulfur deposit, which solidified around the drill string, causing the drill pipe to twist-off and a loss of the bottom-hole assembly. The well was plugged back and as a natural gas producer.[3]
According to publicly available well records from the Oklahoma Corporation Commission, the Bertha Rogers hole ceased production of natural gas in July 1997.[4]
The Bertha Rogers hole was surpassed in 1979 by the Kola Superdeep Borehole dug by the USSR, which reached 12262m (40,230feet) in 1989 and remains the deepest human-made hole on Earth .