Intermediate weight drill stem member
US4416476A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 21, 1980 |
| Grant date | Nov 22, 1983 |
| Priority date | — |
| Expiry date | Nov 21, 2000 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B17/00
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An intermediate weight drill stem member having a tool joint or end with at least one reduced diameter surface for hoisting and handling protected by an enlarged diameter wear protecting length on either side thereof and providing at its junction end with the tubular body a straight-wall surface, a length having a diameter less than the maximum diameter of the adjacent enlarged length, for welding to a straight-wall length of the contiguous externally upset end of the tubular body. The tubular body is preferably about twenty feet long compared to a combined length of ten feet for the two tool joints, thereby eliminating a need for an intermediate wear protector length along the tubular body length.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.