Method of intersecting a first well bore by a second well bore
First Claim
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.
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Accused Products
Abstract
A method and system for intersecting a first, cased well bore, includes forming a second well bore that extends to a region of the first, cased well bore to be intersected. A mill guiding device is positioned in the second well bore and a milling assembly is inserted into the second well bore. The milling assembly is guided along the mill guiding device and contacts an upper external shoulder of a casing coupling of a casing in the first, cased well bore. The mill preferentially removes material from a convex portion of the casing above and adjacent to the upper external shoulder the casing coupling; and removes material from the casing coupling and the adjacent casing until the first, cased well bore and the second well bore are fluidly connected.
51 Citations
20 Claims
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1. A method for intersecting a first, cased well bore, the method comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for intersecting a first, cased well bore, the method comprising:
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forming a second well bore that extends to a region of the first, cased well bore to be intersected; inserting a milling assembly into the second well bore, the milling assembly comprising a mill guide, a mill, and a mill alignment device to align the mill and the mill guide as the mill advances along the mill guide; operating the mill and guiding the mill along the mill guide and contacting an upper external shoulder of a casing coupling of a casing of the first, cased well bore; and externally removing material from a convex portion of the casing above and adjacent to the casing coupling until the first, cased well bore and the second well bore are fluidly connected. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification