Managed pressure drilling computer software for controlling a surface choke to keep the pressure inside the well under control in the field of drilling oil and gas wells; Managed pressure systems, namely, electronic control systems for drilling machines in the nature of surface choke control in the field of oil and gas recovery

'choke':10,44 'comput':4 'control':7,19,34,45 'drill':3,24,37 'electron':33 'field':22,48 'gas':27,52 'insid':15 'keep':12 'machin':38 'manag':1,29 'name':32 'natur':41 'oil':25,50 'pressur':2,14,30 'recoveri':53 'softwar':5 'surfac':9,43 'system':31,35 'well':17,28

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