Wells – Processes – Perforating – weakening – bending or separating pipe at an...
Patent
1996-10-10
1998-06-23
Dang, Hoang C.
Wells
Processes
Perforating, weakening, bending or separating pipe at an...
175 61, E21B 2906, E21B 706
Patent
active
057691665
ABSTRACT:
A wellbore milling system has been invented which includes, in one aspect, a lower window mill, and two watermelon mills connected above the window mill. In one aspect the topmost of the two watermelon mills has a plurality of cutting blades with rough dressed outer surfaces and the lowermost watermelon mill has such blades with smooth outer surfaces. Such a system may be used in a multi-trip method with a starter mill first run into a wellbore to start a window to be milled by the window-watermelon-mills combination.
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Dang Hoang C.
McClung Guy
Weatherford / Lamb, Inc.
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