Drainage for a telescope section of a landing string
US10138703B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 20, 2015 |
| Grant date | Nov 27, 2018 |
| Priority date | — |
| Expiry date | Dec 6, 2035 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B33/043
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A drainage device is for a tubular, telescopic pipe-landing unit having a through pipe bore partially formed of a center pipe extending from an upper end portion of an outer pipe-landing section and with a free end in through an upper end portion of an inner pipe-landing section, which is axially movable in the outer pipe-landing section. The center pipe has a fluid-communication opening arranged for pressure equalization between the pipe bore and an annulus between the center pipe and the outer pipe-landing section. The annulus has a drain passage arranged to be opened by the axial movement of the inner pipe-landing section into the outer pipe-landing section away from an extended, operative position, in which an abutment portion on the upper end portion of the inner pipe-landing section is resting sealingly against a seat portion on a lower end portion of the outer pipe-landing section.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.