E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/47
E21B 33/03 (2006.01) F16J 15/18 (2006.01)
Patent
CA 1169762
TITLE OF THE INVENTION : IMPROVED GEOTHERMAL WELL HEAD ASSEMBLY INVENTOR : LEHMAN T. REED DOCKET NO. B-2741 ABSTRACT OF THE DISCLOSURE A geothermal well head assembly that is removably mounted on the upper flanged end of a surface string of casing that is submitted in the upper portion of a bore hole that extends to the heated zone. A second string of casing is concentrically disposed in the first casing and extends to the heated zone, which second string of casing tends to expand and contract longitudinally to the first string. A rigid ring is disposed in the annulus space between the first and second strings of casing adjacent the ground surface and first and second resilient seals in pressure contact with the interior surface of the first casing and exterior surface of the second casing. Means are provided for periodically and independently adjusting the compression on these seals from the exterior of the assembly without shutting down the geothermal well, which shut down is undesirable as possibly having an adverse effect on future production from the well. -1-
388951
Fetherstonhaugh & Co.
Midway Fishing Tool Co.
LandOfFree
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