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US 12,286,852 B2Granted
System and method for milling past wellbore restrictions
AssigneesSaudi Arabian Oil Company, National Petroleum Technology Company
InventorsBayan Abaza, Othmane Mezabia
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Abstract
Described is a system for milling past wellbore restrictions. The system includes multiple components axially connected to form a bottom hole assembly (BHA). The BHA includes an external coil connector, a motor head assembly (MHA), a metal-to-metal (MTM) motor, a bypass circulation valve (BCV), and a mill component.
Claims7
A method for milling past wellbore restrictions, the method comprising:
- positioning a milling bottom hole assembly (BHA) within a wellbore at a desired depth, the BHA comprising a metal-to-metal (MTM) motor and a bypass circulation valve (BCV);
- moving the BHA in a forward direction through a restriction in the wellbore toward an initial plug;
- performing an initial milling operation, wherein the initial milling operation comprises:
- pumping a quantity of an acid into the wellbore;
- and
- milling the initial plug with the BHA;
- when the initial plug has been milled, then proceeding with one or more subsequent milling operations with the acid;
- following milling of a first predetermined number of plugs, performing, with the BHA, a first trip, having a first distance, wherein the first trip comprises moving the BHA in a backward direction past the restriction.
5 more elements
Dependencies are inferred from the claim text.