The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 04, 1995
Filed:
Mar. 18, 1994
Weatherford U.S., Inc., Houston, TX (US);
Abstract
Milling operations are disclosed which require a reduced number of tool trips into a wellbore to create a cut-out pocket or window in a tubular such as casing in the wellbore. Preferably one or two trips are required. A milling system is disclosed which is useful in such operations which includes a whipstock with an orientation member secured thereto and a milling apparatus with one or more mills and an extending joint, if needed, with a central channel therethrough for receiving the orientation member as the milling apparatus moves down in the wellbore. Such a system may be used in a single-trip milling operation. The milling apparatus is useful in a two-trip operation in which no orientation member is attached to the whipstock and in which a starting mill is initially run in on a first trip to create an initial pocket in the casing. In one aspect the mill(s) mill off high center producing a piece of casing which enters into the hollow portion of the mill(s) and, as needed, into a hollow portion of an interconnected extension member such as a pup joint.