Stage cementing apparatus

Details Stage cementing apparatus Stage cementing apparatus

1986-10-01

1988-06-21

Novosad, Stephen J.

Wells

Valves, closures or changeable restrictors

Rotated operator

166289, E21B 3314

Patent

active

047519673

ABSTRACT:
A stage cementing apparatus (100) is disclosed which incorporates a stage cementing tool (102), a barrel (104) and a mandrel (106) for stage cementing of a casing within a wellbore. The apparatus (100) can be moved between a closed position preventing cement from flowing therethrough to the exterior of the casing at the apparatus to an open position to permit cement to flow from the interior of the casing exterior the casing to cement the casing to the wellbore. The barrel and mandrel can have cooperating splines which are engaged in a position which corresponds to the closed position of the apparatus. When the splines are disengaged, the apparatus is open to permit cement flow exterior the apparatus and concurrent rotation of the barrel relative to the mandrel to enhance the cementing of the casing within the wellbore.

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