Wells – Above ground apparatus – Well caps or casing heads
Patent
1997-12-18
2000-04-04
Bagnell, David
Wells
Above ground apparatus
Well caps or casing heads
166 951, 166 921, 166 931, 166 941, 285298, E21B 3302, F16L 4706
Patent
active
060449047
ABSTRACT:
A wellhead assembly provides a connection between a protruding wellhead pipe of a landfill and piping that leads to treatment, disposal, or recovery equipment, or the like. The wellhead assembly includes a first substantially hollow cylindrical member that has a first open end, a second closed end, and a receiving cavity therein. The closed end has an aperture through it that is smaller in diameter than the diameter of the protruding wellhead pipe, and the first substantially hollow cylindrical member is capable of slidably receiving the protruding wellhead pipe within the receiving cavity. The wellhead assembly also includes a second substantially hollow cylindrical member having a first open end and a second closed end. The first open end is coupled to the second closed end of the first substantially hollow cylindrical member, and is positioned so as to surround and enclose the aperture in the first substantially hollow cylindrical member. The second substantially hollow cylindrical member also has an aperture through it. When the protruding wellhead pipe is slidably received within the receiving cavity of the first substantially hollow cylindrical member, a fluid passageway is formed for landfill gases in the protruding wellhead pipe to escape through the receiving cavity and the aperture of the first substantially hollow cylindrical member, into the second substantially hollow cylindrical member, out through the aperture in the second substantially hollow cylindrical member, and into the piping that leads to the treatment, disposal, or recovery equipment.
REFERENCES:
patent: 2562946 (1951-08-01), Read
patent: 4640533 (1987-02-01), Klemm
patent: 4720124 (1988-01-01), Taylor et al.
patent: 4848458 (1989-07-01), Holdsworth et al.
Product Drawing for Ecogas EZ-Flow Wellhead, Feb. 1996.
Bagnell David
CSR Polypipe, Inc.
Kang Chi H.
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