| 摘要 |
A liner hanger having an elongate vertical body with a central flow passage means at its lower end engaged with a depending liner, releasable coupling means at its upper end releasably engaging a setting tool on a string of setting pipe. The body has a plurality of vertically extending circumferentially spaced radially outwardly opening recesses with upwardly and radially outwardly inclined ramp surfaces and elongate vertical passages between the upper end of the body and the recesses. The hanger next includes vertically extending slips with outer casing engaging surfaces and inner ramp surface engaging surfaces normally positioned in the lower portions of the recesses with their casing engaging surfaces aligned with the outside of the body. The slips are shiftable vertically upwardly and radially outwardly in the recesses. Spring means normally yieldingly urge the slips upwardly and outwardly in the recesses. Elongate push rods are slidably engaged in the passages in the body and releasing means are provided on the setting tool to releasably engage the upper ends and hold the rods down. Latch means are provided between the lower ends of the rods and the slips to hold the slips down when the rods are held down and releasing the slips for upward and outward movement when said releasing means releases and allows said rods to move upwardly in the passages.
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