Method and apparatus for cleaning a blowout preventer stack apparatus
US10435990B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | May 23, 2016 |
| Grant date | Oct 8, 2019 |
| Priority date | — |
| Expiry date | Oct 18, 2037 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B37/00
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method of cleaning a blow-out preventer stack that is preferably attached to an oil and gas well drilling platform including an initial disconnecting of the stack from the well so that it can be lifted. The stack is then preferably lifted vertically a selected distance. The method further includes lowering a water pressure cleaning tool into the stack bore using a hose, the tool preferably being attached to a lower end portion of the hose. Pressurized cleaning fluid is transmitted to the cleaning tool via the hose. A collection vessel is preferably placed below the stack and spaced from the stack so that cleaning fluid and cleaned debris exit the stack bore or interior and enter the vessel during cleaning. The method includes continuously discharging the fluid and debris from the vessel via a discharge outlet of the vessel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.