Invention Grant
- Patent Title: Milling downhole tubulars
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Application No.: US16045123Application Date: 2018-07-25
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Publication No.: US10711551B2Publication Date: 2020-07-14
- Inventor: Ahmed A. Al-Ramadhan
- Applicant: Saudi Arabian Oil Company
- Applicant Address: SA Dhahran
- Assignee: Saudi Arabian Oil Company
- Current Assignee: Saudi Arabian Oil Company
- Current Assignee Address: SA Dhahran
- Agency: Fish & Richardson P.C.
- Main IPC: E21B29/00
- IPC: E21B29/00 ; E21B31/16 ; E21B31/20 ; E21B31/00 ; E21B37/00

Abstract:
A central shaft defines a first interior flow path. The central shaft disposed at least partially within a washover pipe. A lead tapered mill is positioned at a downhole end of the central shaft to center the downhole-type milling tool within a tubular. The lead tapered mill defines a second central flow path in line with the first interior flow path. Milling blades extend between the central shaft and the washover pipe. The milling blades are arranged to allow fluid flow around the milling blades. Each of the milling blades includes a tungsten-carbide hardened face and a soft steel body configured to support a load of the downhole-type milling tool during milling operations. A junk basket is positioned within the washover pipe uphole of the milling blades to receive and retain cuttings formed by the milling blades.
Public/Granted literature
- US20200032604A1 MILLING DOWNHOLE TUBULARS Public/Granted day:2020-01-30
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