Method for drilling a borehole from one cased borehole to another cased borehole
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United States of America Patent
Stats
-
Jul 30, 1996
Grant Date -
N/A
app pub date -
Jan 5, 1995
filing date -
Jan 13, 1994
priority date (Note) -
In Force
status (Latency Note)
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Abstract
In a method for drilling adjacent to a cased known first borehole a second borehole in a predetermined direction the following steps are carried out for a number of along hole depths d.sub.i : measuring components of gravity acceleration and magnetic field (earth & casing); determining direction parameters .alpha..sub.i ; deriving magnetic polestrength components, B.sub.p1,i and B.sub.p2,i ; applying B.sub.p1,i /B.sub.p2,i =s.sub.1,i /s.sub.2,i and determining deviations of the predetermined direction; and controlling drilling direction of the second borehole.
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