Blast joint for subterranean wells
US4349050A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 23, 1980 |
| Grant date | Sep 14, 1982 |
| Priority date | — |
| Expiry date | Sep 23, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T403/7061
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
This is an improved blast joint for subterranean wells which is ideally suited for applications where corrosive compounds such as hydrogen sulfide and carbon dioxide are encountered. The blast joint comprises a plurality of temperature and corrosion resistant hard rings which are in a stacked end face-to-face array, coaxially carried on a length of tubing. The rings are resiliently compressed in the array by spring washers interspaced by flat washers and this assembly is retained by end collars distally carried on the tubing. The end collars which are employed in this invention have a collet type construction; each collar comprising a clamp ring slidably received over the end of the production tubing, having an internally threaded outer end and a tapered inside wall. A collet sleeve with a tapered outside wall is received in the clamp ring. The collar also includes an externally threaded bushing which is received in the threaded outer end of the clamp ring and serves as an axial stop for the collet sleeve as the clamp ring is tightened, compressing the collet sleeve about the outer surface of the tubing, firmly locking the assembly. All members of the collar are coated with a prote…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.