Retractable core barrel valving apparatus
US6029758A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 24, 1997 |
| Grant date | Feb 29, 2000 |
| Priority date | — |
| Expiry date | Nov 24, 2017 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B25/02
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The drilling apparatus includes a wire line core barrel having a head assembly and a drilling tool connected to the head assembly. The head assembly includes a latch body with a landing shoulder seatable on the drill string landing ring, latches seatable in a drill string latch seat and a fluid bypass channel for bypassing from one axial side of the landing shoulder to the other, a bushing in the bypass channel, a valve member movable in the channel from an axial outer bypass channel open position and an axial inner second position extending into the bushing for one of blocking axial inward fluid flow through the bushing and restricting inward flow through the bushing. A spring is provided in the bore inwardly of the bushing for abutting against the valve member in its second position to urge the valve member axially outwardly. A latch retractor is mounted to the latch body for movement relative thereto between a latch seated position and a latch retracted position for retracting the latch body through the drill string and valving mechanism connected to the latch retractor for moving the valve member in the fluid channel to the valve member outer open position. An overshot coupling…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.