Application of drilling circulation bypass valve in Liaohe Offshore Oilfields
Lost circulation is a complex situation frequently seen in drilling.Drilling fluid has been the main prevention and disposal of lost circulation during drilling while there are relatively few measures taken on drilling string.SWACO drilling circulation bypass valve is selected in the drilling of KT1 well after the comparison between conventional plugging and drilling circulation bypass valve,as well as working principles and parameters between two kinds of drilling circulation bypass valve,SWACO,and PBL.Through the employment of SWACO,no pulling out is required during plugging,and repetitive switch is realized in a single operation,efficiently avoiding time waste of tripping and bit changing due to leakage,increasing operation efficiency,and reducing the well control risk of lost circulation to blowout.
lost circulationdrilling circulation bypass valveplugging leakage