Up-hole pump-in core barrel apparatus
US6425449B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 8, 2001 |
| Grant date | Jul 30, 2002 |
| Priority date | — |
| Expiry date | Feb 8, 2021 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B23/08
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The drilling apparatus includes a wire line core barrel head assembly that has a latch body seatable on a drill string landing shoulder and retained in a latch seated position by a latch assembly spring urged to a latch seated position, fluid seals on the latch body to facilitate fluidly propelling the head assembly in an upward direction, valve mechanism in a latch body bypass channel to restrict fluid flow therethrough to provide a signal of the latch body seating on the landing shoulder and then opening together with being retractable to an open position by a latch retractor prior to the latch body being retracted and second valve mechanism to block axial outward flow in the bypass channel. The fluid seals are mounted to a latch body adaptor that may be removed to convert from an up-hole to a down-hole assembly.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.