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    METHOD OF ASSESSING POSITIONAL UNCERTAINTY IN DRILLING A WELL
    3.
    发明公开
    METHOD OF ASSESSING POSITIONAL UNCERTAINTY IN DRILLING A WELL 有权
    法位置中的一个水井钻探中的不确定性客观评定

    公开(公告)号：EP1252415A1

    公开(公告)日：2002-10-30

    申请号：EP00985471.2

    申请日：2000-12-07

    申请人： DEN NORSKE STATS OLJESELSKAP AS

    发明人： HAARSTRAD, Ivar

    IPC分类号： E21B47/022

    CPC分类号： E21B47/022

    摘要： A method is provided for estimating the positional uncertainty in drilling a well such as an oil well. A first set of values is supplied representing a first three-dimensional uncertainty of the actual position of a drill bit with respect to the estimated position. A second set of values is supplied representing a second three-dimensional uncertainty of the actual position of a geological feature with respect to the estimated position thereof. For example, the first set of values relates to positional uncertainties because of the drilling procedure whereas the second set of uncertainties is associated with the obtaining and interpretation of seismic data. The first and second sets of values are combined to form a third set of values which represents a third uncertainty of the position of the drill bit with respect to the geological feature. A probability is then calculated from the third uncertainty and gives the probability that the drill bit will reach a predetermined position relative to the geological feature.

    DEVICE FOR INCREASING THE STEERING EFFECT OF A RUDDER
    5.
    发明授权
    DEVICE FOR INCREASING THE STEERING EFFECT OF A RUDDER 失效
    装置用于增加RUDERS的转向效果

    公开(公告)号：EP0970002B1

    公开(公告)日：2003-01-08

    申请号：EP98912831.9

    申请日：1998-03-19

    申请人： DEN NORSKE STATS OLJESELSKAP AS

    发明人： SAMUELSEN, Arild, K.

    IPC分类号： B63H25/38

    CPC分类号： B63H25/46 ,  B63H25/38 ,  B63H25/52

    摘要： Arrangement for enhancing the steering effect of ship rudders (5) comprising at least one passageway for supplying seawater from a pump to ducts (11) in the rudder, and means (20) communicating with the ducts and being adapted to discharge seawater supplied through these at the rudder surface. Said means comprise a profile element (20) extending preferably vertically at the leading edge of the rudder (5) and being pivotable about a generally vertical axis to extreme positions at either side with respect to the central plane of the rudder. Moreover, there are provided distribution ducts (12A, 12B) which in association with the profile element (20) are adjustable so that the profile element by opposite pivot movement in relation to the angular deflection of the rudder causes seawater to be discharged (12X) along the rudder surface (5B) facing abaft at said angular deflection.

    DEVICE FOR INCREASING THE STEERING EFFECT OF A RUDDER
    6.
    发明公开
    DEVICE FOR INCREASING THE STEERING EFFECT OF A RUDDER 失效
    装置用于增加RUDERS的转向效果

    公开(公告)号：EP0970002A1

    公开(公告)日：2000-01-12

    申请号：EP98912831.9

    申请日：1998-03-19

    申请人： DEN NORSKE STATS OLJESELSKAP AS

    发明人： SAMUELSEN, Arild, K.

    IPC分类号： B63H25/38

    CPC分类号： B63H25/46 ,  B63H25/38 ,  B63H25/52

    摘要： Arrangement for enhancing the steering effect of ship rudders (5) comprising at least one passageway for supplying seawater from a pump to ducts (11) in the rudder, and means (20) communicating with the ducts and being adapted to discharge seawater supplied through these at the rudder surface. Said means comprise a profile element (20) extending preferably vertically at the leading edge of the rudder (5) and being pivotable about a generally vertical axis to extreme positions at either side with respect to the central plane of the rudder. Moreover, there are provided distribution ducts (12A, 12B) which in association with the profile element (20) are adjustable so that the profile element by opposite pivot movement in relation to the angular deflection of the rudder causes seawater to be discharged (12X) along the rudder surface (5B) facing abaft at said angular deflection.