Float Collar&Shoe Stab in type
Stab-In float collar&shoe is an improved method
for cementing large diameter casing. Conventional methods require
Excessive amounts of cement to ensure cement circulation to surface
because of open hole volume, losses To the formation, or mud
displacement efficiency that cannot be determined with sufficient
accuracy. In addition, Large plugs must be
used to separate the cement from the mud and have to be drilled out,
along with any cement In the casing. With stab-in float collar&shoe, the Drill Pipe
is stabbed directly into the Float Shoe or Collar and cement is pumped
through the drill pipe until returns reach surface. Cement is then displaced to the bottom
of the Drill Pipe a wiper dart can be used. The drill pipe is then
picked up, circulated, and pulled out of the hole. The Stab In Float collar&shoe is used
for cementing large diameter casings lowered on drill pipe. The string
presents special cementing consideration due to high displacement volume
of large diameter casing. Problem with high displacement are overcome by using Stab in Cementing Equipment to allow cementing through Drill pipe. Features: Small diameter inner string off drill
pipe is used to displace cement which minimizes displacement volume
behind Cement and there by reduces contamination and save time Drill out of cement inside large casing is minimized by controlling
cement top with displacement fluid in drill pipe And Plunger valve in
Stab in Shoe Improve displacement accuracy — cement mixing and pumping continues until cement returns reach surface Get better cement quality — the reduced cement/mud interface area
and high velocity of flow in the Drill Pipe Minimize cement
contamination while the short pumping time eliminates the need for
cement retarders Reduce cement volume — conventional displacement requires
calculation of excess cement factor, whereas with Stab-in methods excess
cement need be no greater than the volume of the drill pipe. No large
plugs are needed Reduce net rig time — circulating, pumping, and drill-out times are minimized Protect casing — cementing pressures are confined to the drill pipe as in a squeeze job The Stab-in cementing equipment is available in size 5-1/2”-20” The Stab-in cement Float Shoe & Collar are also available with Double Valve and any combination How to use stab in float collar&shoe with Latch in profile Stab in Type Float Collar&shoe Production and Inspection
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