Combination check valve & back pressure valve
First Claim
Patent Images
1. A valve, comprising:
- a cylindrical body with a bore therethrough, said body containing a sealing shoulder, and a portion defining a first and second port;
a pressure piston, disposed within said bore of said cylindrical body, said pressure piston containing a central passageway therethrough and a sealing surface;
first holding means for holding said pressure piston in a first position relative to said cylindrical body;
operating stem means, disposed within said bore of said pressure piston, for blocking flow in either axial direction, said operating piston means having a sealing surface which cooperates with the sealing surface of said pressure piston.
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Abstract
The invention relates to a combination valve and back pressure valve which in one embodiment performs as a two-way check valve, and in another embodiment performs as a back pressure valve. The invention contains both apparatus and method claims. The valve includes a cylindrical member having an inlet port and an outlet port, with a bore therethrough. A valve sleeve is disposed within the bore. A valve stem is also slidably disposed within the bore. A selective dis-attachment assembly is incorporated into the valve and includes pre-selected shear pistons.
64 Citations
16 Claims
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1. A valve, comprising:
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a cylindrical body with a bore therethrough, said body containing a sealing shoulder, and a portion defining a first and second port; a pressure piston, disposed within said bore of said cylindrical body, said pressure piston containing a central passageway therethrough and a sealing surface; first holding means for holding said pressure piston in a first position relative to said cylindrical body; operating stem means, disposed within said bore of said pressure piston, for blocking flow in either axial direction, said operating piston means having a sealing surface which cooperates with the sealing surface of said pressure piston. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An apparatus to control the flow in a well bore comprising:
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a cylindrical member having an inlet port and an outlet port, said cylindrical member having an axial bore therethrough with a sealing bore thereon; a valve sleeve, slidably disposed within said axial bore of said cylindrical member and attached thereto, said valve sleeve having an inner diameter therethrough, and a sealing shoulder thereon; selective dis-attachment means for attaching said cylindrical member to said valve sleeve; a valve stem, slidably disposed within said axial bore of said valve sleeve, said valve stem containing a first and second shoulder, with the first shoulder cooperating with the sealing bore of said cylindrical member, and the second shoulder cooperating with the sealing bore of said valve sleeve. - View Dependent Claims (8, 9, 10, 11, 12, 13, 15, 16)
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14. A method of installing a combination two-way check valve and back pressure valve in a receptacle located in a tubing string penetrating an underground formation during remedial workover operations, the tubing string having attached thereto a surface control valve, the method comprising the steps of:
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a. placing in the landing receptacle the combination valve utilizing a lubricator connected to the surface control valve, said combination valve comprising;
a cylindrical body;
a pressure piston;
first and second selective dis-attachment means responsive to a pressure force;
operating piston means;
biasing means for biasing said operating piston in a closed position;b. removing the surface control valve; c. installing a stack of blow-out preventers, the blow-out preventers being connected to the tubing string; d. pressure testing the blow-out preventers for proper installation by applying pressure to the top of said combination valve.
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Specification