초록 ▼

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 abou

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.

대표청구항 ▼

A drain for a well tubing string, comprising: a tubular mandrel having at least one lateral port and adapted to be interposed between sections of a tubing string: a sleeve member surrounding said mandrel and rotationally movable thereon, said sleeve having at least one lateral port; sealing means di

A drain for a well tubing string, comprising: a tubular mandrel having at least one lateral port and adapted to be interposed between sections of a tubing string: a sleeve member surrounding said mandrel and rotationally movable thereon, said sleeve having at least one lateral port; sealing means disposed about the lateral mandrel port sealing engaging said sleeve, said means comprising an enlarged annular recess in said mandrel surrounding said mandrel port, a sealing ring situated in said recess, said ring having a width less than the depth of said recess providing a gap between the outer surface of said ring and the inner surface of said sleeve, a washer ring surrounding said sealing ring in sealing contact with said sleeve, and an O-ring of lesser diameter than said washer ring, said O-ring situated between said sealing ring and the bottom surface of said recess; support means for maintaining said mandrel port and said sleeve port in longitudinal alignment; guide means for controlling rotational movement of said sleeve with respect to said mandrel; stop means on said sleeve for engaging the casing wall of an oil well, said means operative to limit rotation of said sleeve when said tubing string is rotated.