Ground water sampling unit having a fluid-operated seal

Details Ground water sampling unit having a fluid-operated seal Ground water sampling unit having a fluid-operated seal

1992-09-01

1994-03-15

Drodge, Joseph W.

Wells

Packers or plugs

Cup type

73151, 73863, 166179, 166264, 210170, E21B 2304, E21B 4908

Patent

active

052939340

ABSTRACT:
A lowerable-raisable ground water sampling device has an annular elastomeric seal for preventing the exchange of atmospheric gases with the ground water within a well casing. In its preferred form, the seal is a frusto-conical elastomeric disk mounted on the lower end of a water-extraction tube depending from the lower end of a water sampling unit. A fluid-actuator cylinder is floatable positioned on the tube for moving an annular wall structure downwardly against the disk upper surface, thus to decrease the cone angle of the frusto-conical surface to cause the outer edge of the disk to move out of sealing engagement with the well casing surface. When the fluid cylinder is depressurized, the frusto-conical disk automatically expands to seal against the well casing surface.

REFERENCES:
patent: 2218155 (1940-10-01), Rusler et al.
patent: 2564198 (1951-08-01), Elkins
patent: 3113455 (1963-12-01), Sloan et al.
patent: 4717473 (1988-01-01), Burge et al.
patent: 5033551 (1991-07-01), Grantom
patent: 5147561 (1992-09-01), Burge et al.

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