Drilling head
US4480703A · kind A · utility
98Cited by
9References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 16, 1981 |
| Grant date | Nov 6, 1984 |
| Priority date | — |
| Expiry date | Nov 16, 2001 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B33/085
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A drilling head comprises a tubular body adapted for connection above a well head and having a removable side outlet with a replaceable wear bushing. An assembly removably secured in the head includes a stator and rotor with bearing means and rotating seal means therebetween. A replaceable tubular, kelly seal boot or stripper carried by the rotor includes an enlarged upper end which diverts drilling mud away from the rotating seal and toward the side outlet. Lubricating means is provided for the rotating seal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.