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.