MILLING SYSTEM FOR ABANDONING A WELLBORE

A method of milling an outer casing in a wellbore comprises deploying a bottom hole assembly (BHA) into the wellbore through an inner casing string, the BHA comprising a first mill and a stabilizer located below the first mill, the first mill and the stabilizer each comprising a tubular housing havi...

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Bibliographic Details
Main Authors HAQ, Mohammed Aleemul, SMITH, Ian, SEGURA, Richard J, BANSAL, Ram K, BAILEY, Thomas F
Format Patent
LanguageEnglish
French
German
Published 03.11.2021
Subjects
EARTH DRILLING
EARTH DRILLING, e.g. DEEP DRILLING
FIXED CONSTRUCTIONS
MINING
OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS
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Summary:A method of milling an outer casing in a wellbore comprises deploying a bottom hole assembly (BHA) into the wellbore through an inner casing string, the BHA comprising a first mill and a stabilizer located below the first mill, the first mill and the stabilizer each comprising a tubular housing having an upper end, a lower end, and a bore extending continuously from the upper end to the lower end. The method further comprises extending arms of the stabilizer through a window or milled section of the inner casing string and into engagement with an inner surface of an outer casing string, extending arms of the first mill through the window or milled section and radially cutting through the outer casing string, thereby forming an outer window through the outer casing string, and longitudinally advancing the BHA while longitudinally milling the outer casing string using the first mill, thereby opening the outer window. The BHA can be retrieved from the wellbore and through the inner casing.
Bibliography:Application Number: EP20140787075