Hydrocarbon vent hood
US5921321A · kind A · utility
Inventor
Key dates
| Filing date | Sep 26, 1997 |
| Grant date | Jul 13, 1999 |
| Priority date | — |
| Expiry date | Sep 26, 2017 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B43/0122
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An improved vent hood for abandoned oil and gas wells which is made of concrete and reinforced with linear and coiled rebar to withstand substantial overburden. The invention includes a layer disposed about its interior surface which is impermeable to methane gas. The invention can be fabricated in a single-section conical embodiment or a two-section conical or cylindrical embodiment. The two-section embodiment allows the base conical or cylindrical member to be positioned around the abandoned well casing and thereafter filled with gravel. A concrete lid having an aperture is thereafter placed upon the base section. A vent pipe is thereafter inserted into the aperture to permit gas collected within the vent hood to flow to surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.