Patent ID: 8919441
Filing Date: 2014-12-30
Classification: E21B

Abstract:
1. A method for intersecting a first, cased well bore, the method comprising: forming a second well bore that extends to a region of the first, cased well bore to be intersected; arranging a mill guiding device in the second well bore; inserting a milling assembly into the second well bore; guiding the milling assembly along the mill guiding device and contacting with a mill of the milling assembly an upper external shoulder of a casing coupling of a casing in the first, cased well bore; operating the mill of the mill assembly so that the mill preferentially removes material from a convex portion of the casing above and adjacent to the upper external shoulder of the casing coupling; and removing material from the casing coupling and the adjacent casing until the first, cased well bore and the second well bore are fluidly connected.