The most deep-seated gas-bearing layer in Europe lies in Magossa (Northern Italy) at the depth of 6100m, while the deepest industrial gas production borehole (7460m) is located Texas , USA.
A decent visual representation of the modern super-deep borehole and its equipment is available at the example of one of the deepest wells in the world – Beida site drilled in the state of Oklahoma. The well depth equals 9159 m. The drilling works began in 1970 and lasted for 1.5 years. The height of the rig is 43.3 m, load capacity – 908 tons. Drawworks power equals 2000 kW, and each of the two mud pumps – 1000 kW. The total capacity of the ground circulation system for the mud is 840m; the wellhead blowout valve operates with a pressure of 105.5 MPa.
The biggest-mounted drilling rig floating platforms are considered to be the ones developed by Aker H-6e, produced since 2009 by the Norwegian company Aker Drilling. For example, the first models of this series of semi-submersible were drilling platforms Aker Barents and Aker Spitsbergen with a working deck area of 6300 m2 and drilling capabilities up to 10km in water depths of up to 3 km.
Borehole drilling innovative trends
The general trend of oil and gas extraction from deep-seated horizons can be illustrated by the following figures. Just 20 years ago the greater share of oil (66%) was extracted from the youngest Cenozoic rocks. The older Mesozoic rocks mined provided 19% of the oil, and ancient Paleozoic rocks oil extraction share equaled 15%. Now the situation has changed: the main suppliers of oil are now considered to be Mesozoic rocks, while Paleozoic rocks occupy the second place.
Thus, one of the tasks of drilling ultra-deep wells is to find oil and gas horizons at greater depths. Only the super-deep drilling can put an end to the controversy between the organic and inorganic hypotheses for the origin of oil. Finally, super-deep borehole drilling is a prosperous direction as for a more detailed study of the Earth’s interior. After all, today we know more about open space rather than about the insides.
The industry gets an extra impulse due to technology innovators, such as EGS Company (European Geophysical Services), based in United Kingdom. Being a seasoned expert in geophysics and borehole drilling tasks, the company develops and enhances the approaches, thus pushing the business level industry to the next level. The business cooperates with both governmental and private enterprises, so feel free to get in touch with the company reps if you are looking to outsource a borehole drilling mission of any complexity.
Ultra deep drilling explained
Drilling ultra-deep wells is an extremely complicated process; however, the direction is extremely beneficial from geophysics point of reference. It’s a common knowledge that the pressure and temperature is increasing proportionally with the depth. Thus, at a 7000m under the ground even hydrostatic pressure rises to 70 MPa and keeps on increasing with each 1000 meters. Resolving the challenge of creating a pump and supplying liquid that stand out extremely tough conditions will allow deeper digging, which may grant an access to huge volumes of data on the structure of the planet.