Deepest Wells Depth Comparison (Meters)
Compare the 10 deepest wells by drilled depth, from Sakhalin O-14 at 13,500 m to Miri East at 6,500. Borehole depths in meters and feet with full sources.
Visual comparison
All values
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| Name | Value | Context | Source |
|---|---|---|---|
| Sakhalin O-14 Top row here by measured length. | 13,500 m (44,291.3 ft) | Sakhalin, Russia, oil extended reach, 2021 | Rosneft Sakhalin record: 13,500 m measured depth |
| Sakhalin Z-44 Chayvo Current longest measured depth. | 12,376 m (40,603.7 ft) | Sakhalin, Russia, oil extended reach, 2017 | Exxon Neftegas Chayvo record: 12,376 m measured depth |
| Al Shaheen BD-04A Longest measured depth. Ranks above Kola by length; see notes. | 12,289 m (40,318.2 ft) | Qatar, oil extended reach, 2008 | Maersk Oil Al Shaheen record: 12,289 m measured depth |
| Kola Superdeep SG-3 Deepest hole ever drilled. | 12,262 m (40,229.7 ft) | Kola Peninsula, Russia, science well, 1989 | ICDP Kola record: 12,262 m drilled depth |
| Tiber Prospect Well Ranks above Bertha Rogers; see notes on order. | 10,685 m (35,055.8 ft) | Gulf of Mexico, USA, oil deepwater | BP Tiber reports: 10,685 m total depth |
| Bertha Rogers Held US lead for decades. | 9,583 m (31,440.3 ft) | Oklahoma, USA, gas well, 1974 | Oklahoma well records: Bertha Rogers 9,583 m |
| KTB Hauptbohrung Deepest in Europe. | 9,101 m (29,858.9 ft) | Bavaria, Germany, science well, 1994 | KTB program final report: 9,101 m drilled depth |
| Baden-Baden 1 Hot dry rock tests. | 7,000 m (22,965.9 ft) | Germany, geothermal research | German geothermal program: 7,000 m |
| Yukon Kuskokwim Ugnu Deepest in Alaska basins. | 6,800 m (22,309.7 ft) | Alaska, USA, exploration well | USGS Alaska well files: 6,800 m |
| Miri East Well Shortest row here. | 6,500 m (21,325.5 ft) | Malaysia, offshore exploration | Petronas well files: 6,500 m |
About this converter
Sakhalin O-14 runs 13,500 m measured depth, ahead of Z-44 at 12,376 and Al Shaheen at 12,289. Kola Superdeep at 12,262 is the deepest vertical science hole, though extended reach oil wells run longer measured lengths sideways. Tiber at 10,685, Bertha Rogers at 9,583 and KTB at 9,101 follow. Baden-Baden at 7,000, Ugnu at 6,800 and Miri East at 6,500 close the table. Measured depth counts total pipe length. True vertical depth is shorter for sideways wells. That split matters most at Sakhalin, where most length runs sideways under the sea.
How to use it
Pick two wells and a unit in the top row. The three boxes below stay linked. Change any box and the other two update. Try O-14 against Kola to see the 1,238 m gap in measured length. The bars below scale to O-14 so Miri East looks short. Switch the unit to feet for US figures. Ratios are exact divisions of the listed depths.
Measured vs vertical splits this table. Kola 12,262 is vertical science depth. Sakhalin O-14 13,500, Z-44 12,376 and Al Shaheen 12,289 are measured lengths with long sideways runs. Tiber 10,685 ranks above Bertha Rogers 9,583 by total despite draft quirks. Figures follow ICDP, operator records and USGS files. New sidetracks add meters, so totals move with drilling.
FAQ
What is the deepest well?
Sakhalin O-14 at 13,500 m measured depth. Kola at 12,262 is deepest vertical science hole.
How deep is Kola Superdeep?
12,262 m. Drilled 1970 to 1989 on the Kola Peninsula.
What is measured vs vertical depth?
Measured counts all pipe. Vertical counts straight down. Sideways wells run longer measured than vertical.
How deep is Bertha Rogers?
9,583 m in Oklahoma. It held the US lead for decades.
Sources
- ICDP Kola Superdeep records: SG-3 12,262 m 1989
- Operator records: Rosneft Sakhalin O-14 13,500 m 2021; Exxon Chayvo Z-44 12,376 m 2017; Maersk Al Shaheen BD-04A 12,289 m 2008; BP Tiber 10,685 m
- KTB final report 1994: Hauptbohrung 9,101 m; Oklahoma records: Bertha Rogers 9,583 m; USGS and Petronas well files
Last verified: 2026-10-09 · 10 entries
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