This invention provides an automatic control system and method for bottom hole pressure (BHP) in the underbalanced drilling. It relates to a computer automatic control technology. The automatic control system according to the invention includes a processing module for the BHP based on the mechanisms...http://www.google.fr/patents/US7158886?utm_source=gb-gplus-shareBrevet US7158886 - Automatic control system and method for bottom hole pressure in the underbalance drilling
Automatic control system and method for bottom hole pressure in the ...
