F - Mech Eng,Light,Heat,Weapons – 16 – L
Patent
F - Mech Eng,Light,Heat,Weapons
16
L
166/17
F16L 35/00 (2006.01) E21B 17/08 (2006.01) E21B 17/14 (2006.01) E21B 33/04 (2006.01) E21B 33/14 (2006.01)
Patent
CA 1267834
ROTABLE RECIPROCATING COLLAR FOR BOREHOLE CASING AND STAGE CEMENTING APPARATUS ABSTRACT A stage cementing apparatus is disclosed which incorporates a stage cementing tool, a barrel and a mandrel for stage cementing of a casing within a wellbore. The apparatus 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.
528145
Blandford David M.
Easter John Howard
Blandford David M.
Easter John Howard
Kirby Eades Gale Baker
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