Monobore completion/intervention riser system
US5819852A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 25, 1996 |
| Grant date | Oct 13, 1998 |
| Priority date | — |
| Expiry date | Mar 25, 2016 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B23/12
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A single tubular member, or monobore riser, is provided for tubing hanging operations via a drilling riser and BOP, where wireline and/or coiled tubing deployed tools may be directed into production and annulus bores via a dual bore safety package and a dual bore selector and where various circulation modes may be established in cooperation with the choke and kill conduits in the BOP stack or with a length of tubing through the monobore riser in cooperation with selectively operable valves in the production and annulus bores of the safety package, a retainer valve in a single bore at the top of the dual bore selector, and by means of BOP rams capable of closing about a spool of the safety package and with a side outlet in the safety package. For Xmas Tree (XT) operations, the identical monobore riser is provided for surface communication to a dual bore selector and dual bore Riser Safety Package (RSP) secured to the top of the XT. A length of tubing through the monobore riser in cooperation with valves and bypass and crossover conduits and the production and annulus bores of the RSP provide for various XT circulation modes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.