Well control method and apparatus
US4478287A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 27, 1983 |
| Grant date | Oct 23, 1984 |
| Priority date | — |
| Expiry date | Jan 27, 2003 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B33/035
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A method and apparatus is disclosed for controlling a well drilled from a floating drilling vessel during the time that the marine riser is removed and conductor casing is being lowered and cemented into the well. An annular blowout preventer having a bore substantially equal to that of the structural casing is provided in a stack above the structural casing wellhead. A kill line is provided to the drilling vessel and is connected to the wellbore conduit below the blowout preventer. A spool is attached to the top of the blowout preventer. A casing stripper is attached to the top of the spool and has a mandrel extending from its top about which a wellhead connector attached to the marine riser system is connected. The marine riser system includes a flow diverter at its top disposed on the drilling vessel. The hole to be lined with conductor casing is drilled through the marine riser to a depth of about one thousand (1000) feet below the sea bed. The annular blowout preventer is then closed, the riser system removed, and conductor casing is guided to the mouth of the mandrel atop the casing stripper. The conductor casing is then lowered into the spool and the blowout preventer is ope…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.