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1.
公开(公告)号:US20180245412A1
公开(公告)日:2018-08-30
申请号:US15757549
申请日:2016-09-02
Applicant: STATOIL PETROLEUM AS
Inventor: Henrik MANUM , Åsmund HJULSTAD
Abstract: A method of obtaining an effective bulk modulus of a managed pressure drilling system 1, the method comprising: generating a pressure wave in the system 1; measuring the time interval for the pressure wave to travel over a distance in the system 1; and calculating the effective bulk modulus of the system 1 using the time interval and the length.
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2.
公开(公告)号:US20180266198A1
公开(公告)日:2018-09-20
申请号:US15756874
申请日:2016-09-02
Applicant: STATOIL PETROLEUM AS
Inventor: Henrik MANUM , Qin LI
CPC classification number: E21B21/08 , E21B21/106 , F16K37/0083 , F16K37/0091 , G01F1/74 , G01F15/005 , G01L13/00 , G01L19/0092 , G01N9/36
Abstract: A method of monitoring the state of a choke valve 12 in a managed pressure drilling system 1 using a valve state parameter to represent the state of the choke valve 12, the method comprising: measuring the flow rate of a material across the choke valve 12, measuring the pressure differential of the material across the choke valve 12, obtaining a valve characteristic of the choke valve 12, and calculating the valve state parameter using the flow rate, the pressure differential and the valve characteristic.
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