The purpose of the slick joint stinger is to reduce upward pressure on the drill pipe during cementing. This creates a safer working condition on the rig floor. When using the packer cup method the upward forces are spread out over the inside diameter of the liner and push against the cups which in turn place the pressure on the drill pipe. That overall load increases exponentially as the inside diameter of the liner increases. With the slick joint stinger the liner bears a significant portion of the upward pressure. The slick joint stinger remains a constant 4-1/2″ diameter regardless of liner size. It is recommended that a slick joint be used rather than packing cups for any liner over 7″ in diameter.
The basic procedure for cementing a liner with a slick joint stinger are as follows. After hanging the liner and circulating fluid the setting tool is lifted above the liner hanger. The length of the stinger allows the setting tool to be lifted as much as 15′ or 20′ above the hanger although raising the tool as little as 3′ to 5′ is really all that is necessary. After cementing the liner the drill pipe dart and liner wiper plug are run. Now the releasing assembly along with the slick joint can be pulled from the well. The seal bore assembly in the pack-off bushing is made of easily drillable materials and can be drilled out later.
Highlights
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