| 摘要 |
Seal for maintaining gas-tight contact between casing wall and, particularly, automatic well swabs. The seal includes an upper portion containing a reinforcing tube and being minimally less in diameter than the casing interior, a tapering midsection and a lower skirt portion contacting the well casing. Also included is a secondary embodiment with an upper portion being substantially less in diameter than the casing interior and reinforcing ribs in the tapering midsection.
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