Sleeved drill pipe
US4436118A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 7, 1981 |
| Grant date | Mar 13, 1984 |
| Priority date | — |
| Expiry date | Dec 7, 2001 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C65/483
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A one-piece metal wear sleeve, circumferentially homogeneous, is secured by epoxy to the outer periphery of a drill pipe. The inner diameter of the sleeve is less than the outer diameter of tool joints at the end of the drill pipe. The sleeve is centrifugally cast of two materials, including a tough, strong material such as an iron alloy at its inner portion and a hard non-abrasive wear resistant material such as alloy steel at its outer portion to resist wear on the sleeve, e.g. when it is run in open hole or in a cased hole. The outer portion is homogenous and has a smooth outer periphery so as to reduce wear on the casing when the pipe is run in cased hole.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.