| 摘要 |
A method of determining the initial orientation of a tool 6 to be moved from a drilling site along a wellbore in the earth comprises defining a drilling site coordinate system which is fixed relative to said drilling site; defining a tool coordinate system which is fixed relative to said tool; providing at least one marker 20, 22 on said drilling site defining at least one drilling site reference point which is fixed relative to said drilling site coordinate system; providing at least one marker 20 on said tool defining at least one tool reference point which is fixed relative to said tool coordinate system; determining the positions of said drilling site and tool reference points using a measuring device 24 such as a 3D laser scanner; and using said determined positions to perform a coordinate transformation between said drilling site and tool coordinate systems in order to determine the orientation of said tool. |
