Wells – Above ground apparatus – With valve on cap or head
Patent
1980-07-31
1982-05-04
Novosad, Stephen J.
Wells
Above ground apparatus
With valve on cap or head
166 84, 166 86, 166 88, 285187, 285302, E21B 3303, F16L 1900, F16L 5500
Patent
active
043278043
ABSTRACT:
A valved assembly capable of being removably mounted on a geothermal well head from which a first casing extends downwardly and is cemented in a bore hole. A second casing of smaller external diameter than that of the interior diameter of the first casing extends downwardly to the hot fluid producing zone, and is concentrically disposed within the first casing. The assembly is characterized by first and second groups of resilient sealing rings, so disposed that longitudinal contraction and expansion of the second casing string may take place without the seal between the interior of the assembly and the ambient atmosphere being disrupted. Single manually operated means are provided on the assembly for forcing the first group of resilient rings into compressive slidable sealing contact with the exterior surface of the second casing to effect a primary seal, and concurrently this force being transferred to the second group of rings to force them into radial sealing engagement with a downwardly and inwardly tapering section of the first casing to define a secondary seal.
REFERENCES:
patent: 1598794 (1926-09-01), Warren
patent: 1875793 (1932-09-01), Young et al.
patent: 2187839 (1940-01-01), Penick et al.
patent: 2323179 (1943-06-01), Hall et al.
patent: 2610689 (1952-09-01), Eckel
patent: 2954742 (1960-10-01), Williams
patent: 3976130 (1976-08-01), Chambless et al.
Babcock William C.
Midway Fishing Tool Co.
Novosad Stephen J.
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