Wells – Processes – Cementing – plugging or consolidating
Patent
1991-02-19
1992-03-17
Novosad, Stephen J.
Wells
Processes
Cementing, plugging or consolidating
166 70, 166156, 166238, 166383, 15104062, 137268, E21B 33068, E21B 33076, E21B 3316
Patent
active
050959883
ABSTRACT:
In accordance with illustrative embodiments of the present invention, a ball injecting apparatus for use in launching cementing plugs into a well casing includes a tubular body having an inlet port and one or more cylinders on the sides thereof adapted to be loaded with the balls, gates on the cylinders to prevent and permit injections of the balls, drive members extending into the upper and lower ends of the body and being rotatable relative thereto, and a sleeve slidably splined to the upper drive member and movable downward in the body in response to fluid pressure to transmit rotation of the upper drive member to the lower drive member. A set of uniquely arranged upper and lower plug assemblies are releasable attached to one another and are arranged to be sequentially released in response to seating of a ball, bomb or a dart therein.
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