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《Natural Gas Industry》 2012-07
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Field tests of managed pressure drilling at the gas zone in Well Deyang 1,western Sichuan Basin

Li Yong1,Huang Min2,Jing Hua1,Dai Feng1(1.Drilling Engineering Research Institute,Sinopec Southwest Branch Company,Deyang,Sichuan 618000,China;2.Engineering Technology Research Institute,Sinopec Southwest Branch Company,Deyang,Sichuan 618000,China)  
In the western Sichuan Basin,the clastic strata pressure is rather complicated from the Jurassic Penglaizhen formation to the Triassic Xujiahe formation,and the fluid properties are difficult to predict accurately.In order to reduce the potential kick or loss hazards of gas zone drilling at the same interval,field tests of managed pressure drilling were conducted to drill through the Xujiahe gas zone in Well Deyang-1 in the western Sichuan Basin.By means of annulus pressure monitoring while drilling,surface automatic choking to adjust back pressure,as well as pressure compensation,it can be realized the real-time closed-loop monitoring and precise control of the annulus pressure in the wellbore under different drilling conditions.By use of the advanced micro-flux control system,the gas zone can be monitored and the kicks can be detected and controlled in time,21 minutes earlier than that when the conventional logging method was previously used.And by use of the automatic backpressure compensation system,the strata pressure can be balanced to maintain constant bottomhole pressure under all drilling conditions.The successful application of this system will be taken as experience for drilling through complex formations.
【CateGory Index】: TE242.9
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