公开(公告)号：US20150019134A1

公开(公告)日：2015-01-15

申请号：US14370913

申请日：2013-01-17

Applicant: BP Exploration Operating Company Limited

Inventor： Steven James Sawaryn

IPC: E21B41/00 ,  E21B7/04 ,  E21B47/022

CPC classification number: E21B41/0092 ,  E21B7/04 ,  E21B47/022

Abstract: A method and a system are provided for determining the relative positions of a wellbore and an object. The wellbore is represented by a first ellipse and the object is represented by a second ellipse. The first ellipse represents the positional uncertainty of the wellbore and the second ellipse represents the positional uncertainty of the object. The method includes receiving input data relating to a measured or estimated position of the wellbore and the object. In addition, the method includes calculating an expansion factor representing an amount by which one, or both, of the first ellipse and the second ellipse can be expanded with respect to one or both of respective first and second sets of elliptical parameters so that the first and second ellipses osculate. Further, the method includes determining, based on the calculated expansion factor, position data indicative of the relative positions of the wellbore and the object.

Abstract translation: 提供了一种用于确定井筒和物体的相对位置的方法和系统。 井眼由第一个椭圆表示，物体由第二个椭圆表示。 第一个椭圆表示井筒的位置不确定度，第二个椭圆表示物体的位置不确定度。 该方法包括接收与井筒和物体的测量或估计位置有关的输入数据。 此外，该方法包括计算展开因子，该展开因子表示第一椭圆和第二椭圆之一或两者相对于相应的第一和第二组椭圆参数中的一个或两个而扩展的量，使得第一 和第二个椭圆形。 此外，该方法包括基于所计算的膨胀系数来确定指示井筒和物体的相对位置的位置数据。