Multiple stage cementing of well casing in subsea wells
US4042014A · kind A · utility
33Cited by
10References
28Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 10, 1976 |
| Grant date | Aug 16, 1977 |
| Priority date | — |
| Expiry date | May 10, 1996 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B33/076
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A method and apparatus for multiple stage cementing of well casing in subsea wells. Also, a subsea stage cementer, plug stack assembly. The combination with a subsea stage cementer, plug stack assembly of a packing and shipping crate therefor. A trip-plug for operating a stage cementing collar to open the ports thereof. A dart adapted to enter the bore of a hollow plug to block the flow of liquid through the bore.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.