Method and apparatus for multi-stage cementing of a well casing

Details Method and apparatus for multi-stage cementing of a well casing Method and apparatus for multi-stage cementing of a well casing

E - Fixed Constructions

21

B

166/17

E21B 33/16 (2006.01) E21B 17/07 (2006.01) E21B 17/08 (2006.01) E21B 33/14 (2006.01)

Patent

CA 1289056

ABSTRACT OF THE DISCLOSURE A method and apparatus for multi-stage cementing of a well casing which permits rotation of the upper casing string independent from the lower string during the second or subsequent stage of cementation in order to ensure full displacement of any borehole fluids. The apparatus is readily connected to conventional casing strings and connects the upper and lower strings. The swivel includes a lower liner portion which is secured to the lower casing string and an upper liner portion which is connected to the upper string. These liner portions are telescopically engaged such that the upper liner portion can be vertically displaced relative to the lower liner portion. Both liner portions include longitudinal splines which engage to permit simultaneous rotation of the full string yet can be disengaged by displacing the upper liner portion in order to provide independent rotation of the upper string. The device is utilized to rotatively disengage the upper string from the lower string once the first stage of cementation is completed. Upon displacing the first stage of cement through rotation of the full string, the intermediate multi-stage cement valve is opened and the splines of the swivel mechanism are disengaged. Thereafter, the second stage of cement slurry is pumped through the ports of the multi-stage valve while the upper string is rotated in order to provide complete displacement of the cement.

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