Penetrating into those secrets that are under our feet is no easier than learning all the secrets of the Universe above our heads. And perhaps even more difficult, because in order to look into the depths of the Earth, a very deep well is needed.
The goals of drilling are different (oil production, for example), but ultra-deep (more than 6 km) wells are primarily needed by scientists who want to know what is interesting inside our planet. Where are such "windows" to the center of the Earth and what is the name of the deepest drilled well, we will tell you in this article. First, just one explanation.
Drilling can be done both vertically downwards and at an angle to the earth's surface. In the second case, the extent can be very large, but the depth, if measured from the mouth (the beginning of the well on the surface) to the deepest point in the bowels, is less than those that run perpendicular.
An example is one of the wells of the Chayvinskoye field, the length of which has reached 12,700 m, but in depth it is significantly inferior to the deepest wells.
This well with a depth of 7520 m is located on the territory of modern Western Ukraine. However, work on it was carried out back in the USSR in 1975-1982.
The purpose of creating this one of the deepest wells in the USSR was the extraction of minerals (oil and gas), but the study of the bowels of the earth was also an important task.
9 En-Yakhinskaya well
Not far from the city of Novy Urengoy in the Yamalo-Nenets district. The purpose of drilling the Earth was to determine the composition of the earth's crust at the drilling site and to determine the profitability of developing large depths for mining.
As is usually the case with ultra-deep wells, the subsoil presented the researchers with many "surprises". For example, at a depth of about 4 km, the temperature reached +125 (higher than the calculated one), and after another 3 km, the temperature was already +210 degrees. Nevertheless, scientists completed their research, and in 2006 the well was liquidated.
8 Saatli in Azerbaijan
In the USSR, one of the deepest wells in the world, Saatli, was drilled on the territory of the Republic of Azerbaijan. It was planned to bring its depth to 11 km and conduct various studies related to both the structure of the earth's crust and the development of oil at different depths.
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However, it was not possible to drill such a deep well, as it happens very, very often. During operation, machines often fail due to extremely high temperatures and pressures; the well is curved, since the hardness of different rocks is not uniform; often a minor breakdown entails such problems that their solution requires more funds than the creation of a new one.
So in this case, despite the fact that the materials obtained as a result of drilling were very valuable, the work had to be stopped at around 8324 m.
7 Zisterdorf - the deepest in Austria
Another deep well was drilled in Austria, near the town of Zisterdorf. Nearby were gas and oil fields, and geologists hoped that an ultra-deep well would make it possible to make super-profits in the field of mining.
Indeed, natural gas was discovered at a very considerable depth - to the despair of specialists, it was impossible to extract it. Further drilling ended in an accident, the walls of the well collapsed.
It did not make sense to restore, they decided to drill another nearby, but nothing interesting for the industrialists could be found in it.
6 Universities in the USA
One of the deepest wells on Earth is the University in the USA. Its depth is 8686 m. The materials obtained as a result of drilling are of considerable interest, as they provide new material about the structure of the planet on which we live.
Surprisingly, as a result, it turned out that it was not scientists who were right, but science fiction writers: there are layers of minerals in the bowels, and life exists at great depths - however, we are talking about bacteria!
In the 1990s, drilling of the ultra-deep well Hauptborung began in Germany. It was planned to bring its depth to 12 km, but, as is usually the case with ultra-deep mines, the plans were not given success. Already at around 7 meters, problems began with the machines: drilling vertically down became impossible, the mine began to deviate more and more to the side. Each meter was given with difficulty, and the temperature grew extremely.
Finally, when the heat reached 270 degrees, and endless accidents and failures exhausted everyone, it was decided to suspend work. This happened at a depth of 9.1 km, which makes the Hauptborung well one of the deepest.
The scientific material obtained from the drilling has become the basis for thousands of studies, and the mine itself is currently used for tourism purposes.
4 Baden Unit
In the US, Lone Star attempted to drill an ultra-deep well in 1970. The location near the city of Anadarko in Oklahoma was not chosen by chance: here, wildlife and high scientific potential create a convenient opportunity for both drilling a well and studying it.
The work was carried out for more than a year, and during this time they drilled to a depth of 9159 m, which makes it possible to include it among the deepest mines in the world.
And finally, we present the three deepest wells in the world. In third place is Bertha Rogers - the world's first ultra-deep well, which, however, did not remain the deepest for long. After only a short time, the deepest well in the USSR, the Kola, appeared.
Bert Rogers was drilled by GHK, a mining company, mainly natural gas. The aim of the work was to search for gas at great depths. Work began in 1970, when very little was known about the earth's interior.
The company had high hopes for a place in Washita County, because there are many minerals in Oklahoma, and at that time scientists thought that there were entire layers of oil and gas in the thickness of the earth. However, 500 days of work and huge funds invested in the project turned out to be useless: the drill melted in a layer of liquid sulfur, and gas or oil could not be found.
In addition, scientific research was not carried out during the drilling, since the well was only of commercial importance.
2 KTB-Oberpfalz
In second place in our ranking is the German well Oberpfalz, which has reached a depth of almost 10 km.
This mine holds the record as the deepest vertical well, since it goes to a depth of 7500 m without deviation to the side! This is an unprecedented figure, because the mines at great depths inevitably bend, but the unique equipment used by scientists from Germany made it possible to move the drill vertically down for a very long time.
Not so big and the difference in diameter. Ultra-deep wells begin on the surface of the earth with a hole of a rather large diameter (at Oberpfalz - 71 cm), and then gradually narrow. At the bottom, the German well has a diameter of only about 16 cm.
The reason why the work had to be stopped is the same as in all other cases - equipment failure due to high temperatures.
1 Kola well - the deepest in the world
We owe a stupid legend to the “duck” launched in the Western press, where, with reference to the mythical “scientist of world renown” Azzakov, it was told about a “creature” that escaped from a mine, the temperature in which reached 1000 degrees, about the groans of millions of people who signed up for microphone down and so on.
At first glance, it is clear that the story is sewn with white thread (and it was published, by the way, on April Fool's Day): the temperature in the mine was no higher than 220 degrees, however, with it, as well as at 1000 degrees, no microphone can work ; creatures did not break out, and the named scientist does not exist.
The Kola well is the deepest in the world. Its depth reaches 12262 m, which significantly exceeds the depth of other mines. But not length! At least three wells can now be named - Qatar, Sakhalin-1 and one of the wells of the Chayvo field (Z-42) - which are longer, but not deeper.
Kolskaya gave scientists colossal material, which has not yet been fully processed and comprehended.
| Place | Name | The country | Depth |
|---|---|---|---|
| 1 | Kola | the USSR | 12262 |
| 2 | KTB-Oberpfalz | Germany | 9900 |
| 3 | USA | 9583 | |
| 4 | baden unit | USA | 9159 |
| 5 | Germany | 9100 | |
| 6 | USA | 8686 | |
| 7 | Zisterdorf | Austria | 8553 |
| 8 | USSR (modern Azerbaijan) | 8324 | |
| 9 | Russia | 8250 | |
| 10 | Shevchenkovskaya | USSR (Ukraine) | 7520 |
In the USSR, they loved the scale, but more, and this applied to literally everything. So one well was dug in the Union, which today bears the title of the deepest on earth. It is noteworthy that the well was not drilled for oil production or geological exploration, but purely for scientific research.
Tips used to drill a well.
The Kola super-deep well, or SG-3, is the deepest man-made well in the earth. It is located in the Murmansk region, 10 kilometers from the city of Zapolyarny, in a western direction. The depth of the hole is 12,262 meters. Its diameter at the top is 92 centimeters. At the bottom - 21.5 centimeters. An important feature of the SG-3 is that, unlike any other wells for oil production or geological work, this one was drilled exclusively for scientific purposes.
The well was laid in 1970, on the occasion of the 100th anniversary of the birth of Vladimir Lenin. The chosen location is remarkable in that the well was drilled in outcropping volcanic rocks more than 3 billion years old. By the way, the age of the Earth is about 4.5 billion years. When mining, wells are rarely drilled deeper than two thousand meters.
The work went on for days on end.
Drilling began on May 24, 1970. Up to the mark of 7,000 meters, drilling proceeded easily and calmly, but after the head hit the less dense rocks, problems began. The process has slowed down considerably. Only on June 6, 1979 a new record was set - 9583 meters. It was previously installed in the US by oil producers. The mark of 12,066 meters was passed in 1983. The result was achieved by the International Geological Congress, which was held in Moscow. Subsequently, two accidents occurred at the complex.
Now the complex looks like this.
In 1997, several legends were circulated in the media at once that the Kola super-deep well was the real road to hell. One of these legends said that when the team lowered the microphone to a depth of several thousand meters, human screams, groans and screams were heard there.
Of course, there was nothing of the kind. If only because special equipment is used to record sound in a well at such a depth - but it did not record anything either. There were indeed several accidents at the complex, including an underground explosion during drilling, but geologists definitely did not disturb any underground “demons”.
The well itself is mothballed.
It is really important that 16 research laboratories worked at SG-3. During the Soviet Union, domestic geologists were able to make many valuable discoveries and better understand how our planet works. The work at the site allowed to significantly improve the drilling technology. The scientists were also able to understand the local geological processes, received comprehensive data on the thermal regime of the bowels, underground gases and deep waters.
Unfortunately, today the Kola super-deep well is closed. The building of the complex has been deteriorating since the last laboratory was closed here in 2008, and all equipment was dismantled. The reason is simple - lack of funding. In 2010, the well was already mothballed. Now it is slowly but surely destroyed under the influence of natural processes.
The largest mine in the world on the remote Kola Peninsula in northern Russia. Against the backdrop of the rusting ruins of an abandoned research station, the deepest hole in the world gapes.
Now closed and sealed with a welded metal plate, the Kola Superdeep Borehole is the remnant of a largely forgotten gamble of the human race, directed not at the stars but into the depths of the Earth.
Rumors circulated that a deep well had reached hell: screams and groans of people could be heard from the abyss - as if this was the reason for closing the station and the well. In fact, the reason was different.
The city of Mirny is known for its largest mine in the world: a deep well on the Kola Peninsula is the world's largest man-made hole. 1722 m - deep, so deep that all flights over it were forbidden, because too many helicopters crashed due to suction into the hole.
The deepest hole drilled in the name of science - evidence of the Precambrian period of life was found here. The human race knows about distant galaxies, but knows little about what lies beneath their very feet. Of course, the project produced a huge amount of geological data, most of which showed how little we know about our planet.
The US and USSR fought for space exploration supremacy in the space race, another competition was between the two countries' greatest drillers: the US "Project Mohole" on the Pacific coast of Mexico—was aborted in 1966 due to lack of funding; Councils, a project of the Interdepartmental Scientific Council for the Study of the Earth's Interior and Ultra-Deep Drilling, from 1970 to 1994 on the Kola Peninsula. The study of the Earth is limited to ground observations and seismic studies, but the Kola borehole gave a direct look at the structure of the earth's crust.
Kola Super Deep Well Drilled to Hell
The drill at Kola has never encountered a layer of basalt. Instead, the granite rock was beyond the twelfth kilometer. Surprisingly enough, the rocks of many kilometers are saturated with water. Previously, it was believed that free water should not exist at such great depths.
But the most intriguing discovery is the discovery of biological activity in rocks that are more than two billion years old. The most striking evidence of life comes from microscopic fossils: the preserved remains of twenty-four species of single-celled marine plants, otherwise known as plankton.
Normally, fossils can be found in limestone rocks and silica deposits, but these "microfossils" were encased in organic compounds that have remained surprisingly intact despite extreme environmental pressures and temperatures.
The Kola drilling was forced to stop due to unexpectedly high temperatures encountered. While the temperature gradient in the bowels of the earth. At a depth of approximately 10,000 feet, the temperature increased at a rapid rate reaching 180°C (or 356°F) at the bottom of the hole, as opposed to the expected 100°C (212°F). Also unexpected was the decrease in rock density.
Beyond this point, the rocks had greater porosity and permeability: in combination with high temperatures, they began to behave like plastic. This is why drilling has become practically impossible.
A repository of core samples can be found in the nickel-mining town of Zapolyarny, about ten kilometers south of the hole. With its ambitious mission and contribution to geology and biology, the Kola super-deep well remains the most important relic of Soviet science.
