Variable bore ram
A ram type blowout preventer includes variable ram packers for sealing about tubulars of different outside diameters in the bore of the preventer housing or about a single tubular having a variable outside diameter. Each ram packer includes a body of elastomeric material formed about vertical ribs to conform to tubular having variable OD within a certain range.
1. A variable bore ram packer comprising:
a. an upper plate;
b. a lower plate;
c. plurality of wedge-shaped segments between the upper and lower plates, where each of the plurality of wedge-shaped segments comprises:
i. a top pie-shaped section;
ii. a bottom pie-shaped section having a non-circular rib recieving recess therein; and
iii. a rib between the top and bottom pie-shaped sections, the rib defining a non-circular cross section of a size and shape to slidingly engage the recess in the bottom pie-shaped section; and
d. an elastomeric material supported by the wedge-shaped segments.
2. The packer of claim 1 , wherein the elastomeric material fills in between the top and bottom pie-shaped sections and around the rib.
3. The packer of claim 1 , wherein the top section includes a straight edge with a step therealong, adapted to mate with a complementary step along a straight edge of an adjacent top section.
4. The packer of claim 1 , wherein the bottom section includes a straight edge with a step therealong, adapted to mate with a similar step along a straight edge of an adjacent bottom section.
5. The packer of claim 1 , wherein the top section defines an undersurface and further comprising a groove in the undersurface to receive the rib.
6. The packer of claim 1 , further comprising:
a. an upper pin extending from the top section;
b. a bottom pin extending from the bottom section;
c. a recess in the upper plate to receive the upper pin; and
d. a recess in the lower plate to receive the bottom pin.
7. A variable bore ram packer comprising:
a. an upper plate;
b. a lower plate;
c. plurality of wedge-shaped segments between the upper and lower plates, wherein each of the plurality of wedge-shaped segments comprises:
i. a top pie-shaped section having a non-circular rib-recieving recess therein;
ii. a bottom pie-shaped section; and
a rib between the top and bottom pie-shaped sections, the rib defining a non-circular cross section of a size and shape to slidingly engage the recess in the top pie-shaped section; and
d. an elastomeric material supported by the wedge-shaped segments.