Combination well blowout preventer

Claim 2

In well blowout prevention apparatus, the combination comprising a. housing structure defining vertically spaced intercommunicating chambers, b. an inwardly constrictable packer annulus in one of said chambers for forming therewith a vertical passage through which well tools may be run, c. an annular piston movable upwardly in said one chamber to constrict the annulus for sealing engagement with a well tool in said passage, d. a plug stopper having a through opening and mounted to rotate in another of said chambers to bring said through opening into and out of registration with said passage, e. said housing structure including a section at the side of the plug opposite said one chamber and which is removable to provide direct access to the plug.

Claim 3

The combination of claim 1 wherein there is space in said other chamber between the plug and said housing structure, and including elastomer-sealing means filling said space and extending annularly about said through opening when said opening is in registration with said passage.

Claim 4

The combination of claim 2 including a metallic seal ring forming a portion of said passage adjacent said plug and having metal-to-metal sealing contact with the plug, the ring acting to confine said elastomer sealing means against pressure induced displacement from said space.

Claim 5

The combination of claim 2 wherein said sealing means includes upper and lower generally hemispheric extents.

Claim 6

The combination of claim 4 including a shaft connected to said plug stopper and extending to the housing exterior and adjacent said removable section, and operator means at the housing exterior connected to rotate said shaft.

Claim 7

The combination of claim 5 wherein said operator means includes pressure-responsive reciprocable piston structure, a housing for said piston structure, rack and pinion gearing operable to convert reciprocation of said piston structure to rotation of said shaft, and means to limit the stopper to rotate through an angle of about 90*.

Claim 8

The combination of claim 6 including means to controllably supply fluid pressure to said annular piston and to said piston structure.

Claim 9

The combination of claim 1 including operator means at one side of said housing structure, there being a shaft extending between the plug and said operator means to transmit rotation to the plug.

Claim 10

The combination of claim 8 including an annular seal extending about said shaft to seal off against said housing structure, and another seal joined to said annular seal extending about said plug to seal off between upper and lower extents of an elastomer-sealing means.

Claim 11

In a flow control assembly, the combination comprising a. a body having first and second sections forming a chamber and a stopper received in said chamber, the stopper having an opening extending therethrough and defining a first axis, b. trunnion means mounting the stopper for rotation within the body about a second axis to carry said opening into and out of flow-passing positions, the body having inlet and outlet passages with which the sTopper through opening registers in flow-passing position, c. an annulus extending about said trunnion means, d. seal ring structure having a first portion extending closely about the annulus to seal off between the annulus and body and a second portion extending about the stopper in nonsealing relation therewith to permit rotation of the stopper relative to said ring second portion while said ring second portion seals off against the body, said ring second portion being confined between said body first and second sections, and e. a housing mounted by one of said sections and defining a passage in alignment with said stopper opening in its flow-passing position, and a constrictable annulus movable in said housing between a constricted condition closing said passage and an expanded condition when said passage is open.

Claim 12

In a flow control assembly, the combination comprising a. a body having first and second sections forming a chamber and a stopper received in said chamber, the stopper having an opening extending therethrough and defining a first axis, b. trunnion means mounting the stopper for rotation within the body about a second axis to carry said opening into and out of flow-passing positions, the body having inlet and outlet passages with which the sTopper through opening registers in flow-passing position, c. an annulus extending about said trunnion means, d. seal ring structure having a first portion extending closely about the annulus to seal off between the annulus and body and a second portion extending about the stopper in nonsealing relation therewith to permit rotation of the stopper relative to said ring second portion while said ring second portion seals off against the body, said ring second portion being confined between said body first and second sections, and e. a housing mounted by one of said sections and defining a passage in alignment with said stopper opening in its flow-passing position, and a constrictable annulus movable in said housing between a constricted condition closing said passage and an expanded condition when said passage is open.