Well pressure activated pack-off head
US6588502B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 24, 2001 |
| Grant date | Jul 8, 2003 |
| Priority date | — |
| Expiry date | Jun 21, 2021 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B33/072
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A well pressure activated pack off head comprising a hollow body formed for coaxial connection to the wellhead which provides for unobstructed passage of a data transmitting wireline therethrough. Disposed coaxially within the hollow body is a pack off rubber with a passage formed along its longitudinal axis for passage of a data transmitting wireline. Located below the pack off rubber is a piston in pressure communication with the wellbore. High pressure inside of the wellbore squeezes the piston against the pack off rubber and compresses it tightly around the wireline. A pressure seal is formed between the pack off rubber and the wireline when the pack off rubber is sufficiently compressed by the piston.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.