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US 6,802,374 B2Granted
Reverse cementing float shoe
AssigneeSchlumberger Technology Corporation
InventorsMike Edgar, Greg Horton
Life of this patent
Estimating the term…
Abstract
A float shoe comprising an upper section having a casing connection at an upper end thereof, and a lower section slidably coupled to the upper section, the lower section comprising a closed lower end and having at least one port disposed therein.
Claims20
A float shoe, comprising:
- an upper section having a casing connection at an upper end thereof;
- a lower section slidably coupled to the upper section, the lower section comprising a closed lower end and having at least one port disposed therein;
- and
- a plurality of shear members connected to the upper section and the lower section such that when the plurality of shear members are intact the upper section and lower section are maintained in an open position wherein the at least one port is open, and when the plurality of shear members are sheared the upper section and the lower section are able to slide into a closed position wherein the at least one port is closed;
- wherein each of the plurality of shear members is disposed in a shear member port in the upper section and extends into a shear member slot in the lower section.
2 more elements
A method for cementing a casing in a borehole, comprising the steps of:
- inserting the casing having a float shoe on a lower end thereof into the borehole;
- filling an annulus between a wall of the borehole and the casing with a cement slurry;
- and
- applying a downward force to the casing sufficient to shear a plurality of shear members and move an upper section and a lower section of the float shoe into a closed position;
- wherein each of the plurality of shear members is disposed in a shear port in the upper section and each extends into a shear slot in the lower section.
2 more elements
A float shoe, comprising:
- hollow body having a casing connection at an upper end thereof, a closed end at a bottom end thereof, and at least one port disposed in a side thereof;
- a sliding member disposed on an inside of the hollow body and positioned so that fluid can flow through the at least one port when the sliding member is in an open position and so that the at least one port is sealed when the sliding member is in a closed position, the sliding member having an annular upper surface and a fluid flow path through a center of the annular upper surface;
- a closing member that allows flow upward through the fluid flow path and does not allow flow downward through the fluid flow path, the closing member positioned to transmit fluid pressure in the casing to a downward force on the sliding member;
- and
- a retention member fixed on the inside of the cylindrical member above the sliding member, the retention member adapted to retain the closing member below the retention member and to allow fluids to flow past,
- where in the closing member is disposed inside the hollow body and above the sliding member, the closing member having an outer diameter that is larger than an inner diameter of the annular upper surface such that the closing member forms a seal when mated with the annular upper surface of the sliding member.
3 more elements
Dependencies are inferred from the claim text.