Apparatus for injecting displacement plugs
First Claim
1. An apparatus for injecting cement displacement plugs into a well bore for cementing casing comprising:
- (a) a well bore casing with an upper inlet and a lower outlet;
(b) a manifold comprising a housing provided with an inlet and an outlet connected by a flow passage through the housing;
(c) at least one launching cylinder comprising a housing provided with an interior bore connected with said flow passage;
(d) a spring loaded injection piston mounted within said launching housing;
(e) pick up means for insertion into said interior bore;
(f) releasable retaining means for selectively releasing said pick up means;
(g) means for remote mounting of said manifold and means for connection of said manifold to said well bore; and
,(h) means for a remote actuation of said injection piston, and means for remote actuation of said retaining means.
1 Assignment
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Accused Products
Abstract
A displacement plug injection apparatus and manifold for sequentially injecting cementing plugs into the casing in an oil or gas well to reduce contamination of the interface between the well fluid and the cement, which apparatus includes an injection manifold for injecting pick-up balls into the fluid stream which pass through an inlet port in the casing to selectively pick-up cement displacement plugs in a plug set which are suspended or held in place with in the casing to be cemented. A positive mechanical indication of the injection of each pick-up ball is apparent and in adition a secondary magnetic sensor indicates a passage of a pick-up ball into the throat provided above the set of displacement plugs to indicate the beginning of the launch of each plug in the plug set. Also disclosed is a new and improved check valve apparatus for use in float collars and cementing shoes used in casing cementing operations.
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Citations
6 Claims
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1. An apparatus for injecting cement displacement plugs into a well bore for cementing casing comprising:
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(a) a well bore casing with an upper inlet and a lower outlet; (b) a manifold comprising a housing provided with an inlet and an outlet connected by a flow passage through the housing; (c) at least one launching cylinder comprising a housing provided with an interior bore connected with said flow passage; (d) a spring loaded injection piston mounted within said launching housing; (e) pick up means for insertion into said interior bore; (f) releasable retaining means for selectively releasing said pick up means; (g) means for remote mounting of said manifold and means for connection of said manifold to said well bore; and
,(h) means for a remote actuation of said injection piston, and means for remote actuation of said retaining means. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification