Mechanical tubing drain

Details Mechanical tubing drain Mechanical tubing drain

1979-10-26

1982-02-16

Leppink, James A.

Wells

Means anchored against rotation in one conduit section for...

166330, 166331, E21B 33129, E21B 3412

Patent

active

043155421

ABSTRACT:
A mechanical tubing drain connected in a tubing string in an oil well. The invention, which provides means for selectively opening and closing drain ports to drain fluid from a tubing string, comprises a ported mandrel slidably encased in a correspondingly ported sleeve. Seal means are provided about the mandrel port. Means are also provided to maintain proper longitudinal alignment between the mandrel and sleeve ports as well as guiding and restricting the movement of the sleeve about the mandrel. Spring loaded shoes attached to the sleeve engage the well casing to hold the sleeve immobile relative to the ported mandrel. In operation, the mandrel is rotated to selectively align the mandrel and sleeve ports to permit unloading of the tubing contents.

REFERENCES:
patent: 1896111 (1933-02-01), Simmons
patent: 1968391 (1934-07-01), Hamilton
patent: 2270952 (1942-01-01), Lee
patent: 2360311 (1944-10-01), Ausburn et al.
patent: 2711302 (1955-06-01), McWhorter
patent: 2858099 (1958-10-01), Althouse, Jr. et al.
patent: 3380706 (1968-04-01), Scaramucci
patent: 3971402 (1976-07-01), Gallo
patent: 3993130 (1976-11-01), Papp

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