Drilling system and method
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[0091] As pointed out hereinbefore, the present system and method of drilling wells is based on a closed-loop system. The inventive method and system is applied to oil and gas wells, as well as to geothermal wells.
[0092] As regards the mud circuit, the circulation of the drilling fluid down the wellbore may be through the drill string and the return through the annulus, as in state-of-the-art methods, but not limited to it. As a matter of fact, any way of circulation of the drilling fluid may be successfully employed in the practice of the present system and method, no matter where the fluids are injected or returned.
[0093] In a very broad way, the system and method of the invention comprises adjusting the wellbore pressure with the aid of a pressure / flow control device to correct the bottomhole pressure to prevent fluid influx or losses in a pro-active as opposed to the state-of-the-art reactive manner.
[0094] While several of the devices being described have been used in some confi...
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