CN112593891B - Blowout prevention box rubber core sealing assembly - Google Patents
Blowout prevention box rubber core sealing assembly Download PDFInfo
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- CN112593891B CN112593891B CN202011574333.7A CN202011574333A CN112593891B CN 112593891 B CN112593891 B CN 112593891B CN 202011574333 A CN202011574333 A CN 202011574333A CN 112593891 B CN112593891 B CN 112593891B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
- E21B33/06—Blow-out preventers, i.e. apparatus closing around a drill pipe, e.g. annular blow-out preventers
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
Abstract
In order to solve the problem that the rubber core sealing assembly in the prior art is troublesome to install, the invention discloses a blowout prevention box rubber core sealing assembly which comprises a left rubber core, wherein the left rubber core is provided with a left hard layer and a left soft layer and is integrally processed by adopting a vulcanization process; the right rubber core is provided with a right hard layer and a right soft layer and is integrally processed as the left rubber core; the right rubber core and the left rubber core are folded left and right to form a complete hollow cylindrical structure; the spacer bush is provided with an upper hard layer, a middle soft layer and a lower hard layer, and the whole spacer bush is processed by adopting a vulcanization process; the two spacers surround to form a cylinder structure; wherein, when in use, the hollow cylindrical structure is positioned inside the cylindrical structure. The invention provides a blowout prevention box rubber core sealing assembly, wherein the left rubber core, the right rubber core and the spacer sleeve are provided with areas with different hardness so as to meet the sealing and mounting requirements, and the split type structural design greatly improves the mounting convenience.
Description
Technical Field
The invention relates to the technical field of wellhead safety protection, in particular to a blowout prevention box rubber core sealing assembly.
Background
In oil production operations, safety operations are the first. A large number of instruments in the excavation process are used for safety protection, wherein a wellhead blowout preventer is an indispensable safety guarantee instrument in the excavation process. Blowout preventer cartridges are a particular form of wellhead blowout preventer having a seal assembly mounted therein.
In the use process of the existing sealing assembly, all parts are designed integrally, and the installation is troublesome. On the other hand, the whole sealing assembly is made of one material, the mounting requirements of different parts of the sealing assembly in the using process cannot be met, or the sealing assembly is made of multiple materials in a bonding mode, the bonding part is easy to be debonded in the using process, and the sealing effect is affected.
Disclosure of Invention
In order to solve the problem that a rubber core sealing assembly in the prior art is troublesome to install, the left rubber core, the right rubber core and the spacer sleeve are provided with areas with different hardness so as to meet the sealing and installing requirements, and the split type structure design greatly improves the installation convenience.
The technical scheme adopted by the invention is as follows:
the blowout prevention box rubber core sealing component comprises
The left rubber core is in a semicircular arc sheet shape, is provided with a left hard layer and a left soft layer, and is integrally processed by adopting a vulcanization process;
the right rubber core is in a semicircular arc sheet shape, is provided with a right hard layer and a right soft layer, and is integrally processed in the same way as the left rubber core; the right rubber core and the left rubber core are folded left and right to form a complete hollow cylindrical structure;
the semi-arc sheet-shaped spacer bush is provided with an upper hard layer, a middle soft layer and a lower hard layer, and is integrally processed by adopting a vulcanization process; the two spacers surround to form a cylinder structure;
wherein, when in use, the hollow cylindrical structure is positioned at the inner side of the cylindrical structure.
In one embodiment of the present application, the vulcanization process of the left or right rubber core comprises the following steps,
step 3, opening the mold, keeping the lower rubber core semi-finished product in the mold, cleaning burrs and burrs, and treating the top surface of the lower rubber core semi-finished product;
step 4, adding a high-hardness polyurethane rubber material into the mold, closing the mold and vulcanizing at the pressure of 4-10 MPa for 25-45 min;
step 5, demolding to obtain a semi-finished product of the rubber core;
and 6, vulcanizing the semi-finished rubber core in two stages at the vulcanization temperature of 80-160 ℃ for 10-24 h to obtain the rubber core.
In one embodiment of the present application, the vulcanization process of the spacer comprises the steps of,
step 3, opening the mold, keeping the middle spacer bush semi-finished product in the mold, cleaning burrs and burrs, and treating the top surface and the bottom surface of the middle spacer bush semi-finished product;
step 4, adding a high-hardness polyurethane rubber material into the mold, wherein the high-hardness polyurethane rubber material is respectively positioned at the top surface and the bottom surface of the middle spacer bush semi-finished product, and performing mold closing and vulcanization for 40-60 min;
step 5, demolding to obtain a semi-finished spacer bush product;
and 6, vulcanizing the semi-finished spacer bush in a second stage for 10-24 hours to obtain the spacer bush.
In one embodiment of the application, when the top surface of the lower rubber core semi-finished product is treated in the step 3, acetone, alcohol, butanone, ethyl acetate or methanol is adopted to wipe for 2-5 times.
In one embodiment of the present application, color concentrates having different colors or the same color are added to the low hardness urethane rubber material in step 2 and the high hardness urethane rubber material in step 4.
In one embodiment of the present application, the axial lengths of the left rubber core, the right rubber core and the spacer are the same;
the axial thicknesses of the left hard layer and the right hard layer are consistent and are smaller than that of the left soft layer;
the axial thickness of the upper hard layer is consistent with that of the lower hard layer, is smaller than that of the middle soft layer, and is smaller than that of the left hard layer.
In one embodiment of the present application, a groove and a protrusion are formed on the bonding surface of the right rubber core and the left rubber core.
In one embodiment of the present application, an axial thickness of the left hard layer and the right hard layer is equal to or greater than an axial thickness of the upper hard layer or the lower hard layer.
In an embodiment of this application, the core is glued on a left side perhaps in the vulcanization technology of the core is glued on the right side, the soft layer in a left side with the soft layer in the right side adopts the polyurethane rubber material of 80~ 86A's low rigidity, the hard layer in a left side with the hard layer in the right side adopts 90~ 100A's high rigidity polyurethane rubber material.
In one embodiment of the application, in the vulcanization process of the spacer sleeve, the middle soft layer is made of 50-60A of low-hardness polyurethane rubber material, and the upper hard layer and the lower hard layer are made of 90-100A of high-hardness polyurethane rubber material.
The invention has the beneficial effects that:
1. the invention provides a blowout prevention box rubber core sealing assembly, which aims to solve the problem that the sealing assembly in the prior art cannot meet the installation requirements of different parts or is easy to debond. The assembly comprises a left rubber core, a right rubber core and a spacer bush. The left rubber core and the right rubber core are prepared by the preparation process of the rubber cores, and the spacer sleeves are prepared by the preparation process of the spacer sleeves, so that areas with different hardness are formed to meet the requirements of sealing and installation. Compared with an integrated structure, the sealing assembly disclosed by the invention adopts a split structure design, so that the installation convenience is greatly improved.
2. According to the invention, the left rubber core and the right rubber core are directly vulcanized into a whole by the low-hardness polyurethane rubber material and the high-hardness polyurethane rubber material, on one hand, the low-hardness polyurethane rubber material and the high-hardness polyurethane rubber material are vulcanized and formed into two areas with different hardness, the area with softer texture has larger deformability and can meet the sealing requirement, and the area with harder texture has larger rigidity and can meet the requirements of clamping and force transmission. On the other hand, two areas with different hardness are directly vulcanized into a whole, and compared with bonding molding, the bonding strength is higher, and debonding and the like are not easy to occur.
3. According to the invention, the spacer bush is formed by directly vulcanizing the low-hardness polyurethane rubber material and the high-hardness polyurethane rubber material into a whole, on one hand, three areas with different hardness are formed after the low-hardness polyurethane rubber material and the high-hardness polyurethane rubber material are vulcanized and molded, the area with the softer texture has larger deformability and can meet the sealing requirement, and the area with the harder texture has larger rigidity and can meet the requirements of clamping and force transmission. On the other hand, three areas with different hardness are directly vulcanized into a whole, and compared with bonding molding, the bonding strength is higher, and debonding and the like are not easy to occur.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of a sealing assembly in embodiment 3.
Fig. 2 is a schematic exploded view of the sealing assembly according to embodiment 3.
Fig. 3 is a schematic exploded view of the sealing assembly according to embodiment 3.
Detailed Description
In the following, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. Accordingly, the drawings and description are to be regarded as illustrative in nature, and not as restrictive.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, but are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the invention.
The following disclosure provides many different embodiments or examples for implementing different features of the invention. To simplify the disclosure of the present invention, specific example components and arrangements are described below. Of course, they are merely examples and are not intended to limit the present invention.
Embodiments of the invention are described in detail below with reference to the accompanying drawings.
Example 1
The preparation process of the rubber core comprises the following steps,
And 2, adding a low-hardness polyurethane rubber material into the mold, closing the mold and vulcanizing for 3-8 min to obtain a lower rubber core semi-finished product.
And step 3, opening the mold, keeping the lower rubber core semi-finished product in the mold, cleaning burrs and burrs, and treating the top surface of the lower rubber core semi-finished product. When the top surface of the lower rubber core semi-finished product is treated, acetone, alcohol, butanone, ethyl acetate or methanol is used for wiping for 2-5 times to remove grease adhered to the top surface of the lower rubber core semi-finished product, so that higher cleaning degree and bonding foundation are ensured.
And 4, adding a high-hardness polyurethane rubber material into the mold, closing the mold and vulcanizing, wherein the pressure is 4-10 MPa, and the vulcanizing time is 25-45 min.
And 5, demolding to obtain a semi-finished product of the rubber core.
And 6, vulcanizing the semi-finished rubber core in two stages at the vulcanization temperature of 80-160 ℃ for 10-24 h to obtain the rubber core.
In this embodiment, color concentrates with different colors are added to the low hardness urethane rubber material in step 2 and the high hardness urethane rubber material in step 4, so that the low hardness region, the high hardness region, and the boundary can be clearly displayed.
In this embodiment, the rubber core is directly vulcanized into a whole by low hardness polyurethane rubber material and high hardness polyurethane rubber material, forms two areas of different hardness after low hardness polyurethane rubber material and high hardness polyurethane rubber material vulcanization molding on the one hand, and the softer region of texture has great deformability, can satisfy sealed requirement, and the harder region of texture has great rigidity, can satisfy the requirement of clamping, biography power. On the other hand, two areas with different hardness are directly vulcanized into a whole, and compared with bonding molding, the bonding strength is higher, and debonding and the like are not easy to occur.
Example 2
The preparation process of the spacer bush comprises the following steps,
And 2, adding a low-hardness polyurethane rubber material into the mold, closing the mold and vulcanizing for 6-10 min to obtain a semi-finished product of the middle spacer.
And step 3, opening the mold, keeping the middle spacer bush semi-finished product in the mold, cleaning burrs and burrs, and treating the top surface and the bottom surface of the middle spacer bush semi-finished product. When the top surface and the bottom surface of the semi-finished product of the middle spacer sleeve are treated, acetone, alcohol, butanone, ethyl acetate or methanol is used for wiping for 2-5 times, grease adhered to the surface is removed, and high cleaning degree and adhesion foundation are guaranteed.
And 4, replacing a high-hardness mold assembly, adding a high-hardness polyurethane rubber material into the mold, wherein the high-hardness polyurethane rubber material is respectively positioned at the top surface and the bottom surface of the middle spacer bush semi-finished product, and performing mold closing and vulcanization for 40-60 min.
And 5, demolding to obtain a semi-finished spacer bush product.
And 6, vulcanizing the semi-finished spacer bush in a second stage for 10-24 hours to obtain the spacer bush.
In this embodiment, color concentrates with different colors are added to the low hardness urethane rubber material in step 2 and the high hardness urethane rubber material in step 4, so that the low hardness region, the high hardness region, and the boundary can be clearly displayed.
In this embodiment, the spacer bush is directly vulcanized into a whole by low hardness polyurethane rubber material and high hardness polyurethane rubber material, forms three regions of different hardness after low hardness polyurethane rubber material and high hardness polyurethane rubber material vulcanization molding on the one hand, and the region that the texture is softer has great deformability, can satisfy sealed requirement, and the region that the texture is harder has great rigidity, can satisfy the requirement of clamping, biography power. On the other hand, three areas with different hardness are directly vulcanized into a whole, and compared with bonding molding, the connection strength is higher, and debonding and the like are not easy to occur.
Example 3
In order to solve the problem that the installation of a sealing assembly is troublesome in the prior art, the embodiment provides an improved blowout prevention box rubber core sealing assembly, and the structure of the improved blowout prevention box rubber core sealing assembly is shown in the attached drawings 1-3. The sealing component comprises a left rubber core 1, a right rubber core 2 and two spacer bushes 3. The two spacer bushes 3 surround to form a cylinder structure, and the left rubber core 1 and the right rubber core 2 are combined and then positioned on the inner side of the cylinder structure. Compare in integral structure, seal assembly can comparatively conveniently install through above-mentioned components of a whole that can function independently structural design, improves the installation effectiveness.
Specifically, the left rubber core 1 is integrally in the shape of a semicircular arc sheet and is prepared by the preparation process of the rubber core in the embodiment 1. In the axial center direction of the left rubber core 1, the left rubber core 1 has a left hard layer 11 and a left soft layer 12. The axial thickness of the left hard layer 11 is much smaller than the axial thickness of the left soft layer 12. The left hard layer 11 is made of high-hardness polyurethane rubber material, and red color masterbatch is added into the rubber material. The left soft layer 12 is made of a low-hardness polyurethane rubber material, and a blue color masterbatch is added into the rubber material. The left hard layer 11 and the left soft layer 12 are integrally vulcanized, and the difference in hardness between the red left hard layer 11 and the blue left soft layer 12 is about 12A. The two arc-shaped end faces of the left rubber core 1 are radially formed with grooves and bulges.
The right rubber core 2 is integrally in a semi-circular arc sheet shape, is prepared by the preparation process of the rubber core in the embodiment 1, and has a structure similar to that of the left rubber core 1. The axial length of the left rubber core 1 is consistent with that of the right rubber core 2. The right cement core 2 has a right hard layer 21 and a right soft layer 22 in the axial center direction of the right cement core 2. The axial thickness of the right hard layer 21 is much smaller than the axial thickness of the right soft layer 22 and coincides with the axial thickness of the left hard layer 11. The right hard layer 21 is made of high-hardness polyurethane rubber material, and red color masterbatch is added into the rubber material. The right soft layer 22 is made of low-hardness polyurethane rubber material, and blue color masterbatch is added into the rubber material. The right hard layer 21 and the right soft layer 22 are integrally vulcanized, and the difference in hardness between the red right hard layer 21 and the blue right soft layer 22 is about 12A. The two arc-shaped end faces of the right rubber core 2 are radially formed with grooves and bulges.
The left rubber core 1 and the right rubber core 2 are folded left and right, namely the bulge of the left rubber core 1 is inserted into the groove of the right rubber core 2, and the bulge of the right rubber core 2 is inserted into the groove of the rubber core, so that a complete hollow cylindrical structure is formed.
When the left rubber core 1 and the right rubber core 2 are prepared, the left soft layer 12 and the right soft layer 22 are made of 80-84A low-hardness polyurethane rubber materials, and the die closing and vulcanizing time is 5 min. The left hard layer 11 and the right hard layer 21 are made of 95-100A high-hardness polyurethane rubber materials, the die closing vulcanization pressure is 8MPa, and the vulcanization time is 30 min. The secondary vulcanization temperature is 110 ℃, and the vulcanization time is 14 h.
The spacer 3, which is in the form of a semicircular arc sheet as a whole, was prepared by the spacer preparation process of example 2. The axial length of the spacer 3 is consistent with that of the left rubber core 1. Two spacer bushes 3 with the same structure surround to form a cylinder structure. The spacer 3 has an upper hard layer 31, a middle soft layer 32 and a lower hard layer 33 in the axial center direction of the spacer 3. The axial thickness of the middle soft layer 32 is greater than the axial thickness of the upper hard layer 31 and the lower hard layer 32. The axial thicknesses of the upper hard layer 31 and the lower hard layer 32 are uniform and smaller than the axial thickness of the left hard layer 11. The upper hard layer 31 and the lower hard layer 32 are made of high-hardness polyurethane rubber materials, and dark red color master batch is added into the rubber materials. The middle soft layer 32 is made of low-hardness polyurethane rubber material, and orange red color master batch is added into the rubber material. The upper hard layer 31, the middle soft layer 32 and the lower hard layer 33 are vulcanization-bonded as a whole.
When the spacer 3 is prepared, the middle soft layer 32 is made of 50-55A of low-hardness polyurethane rubber material, and the die closing and vulcanizing time is 10 min. The upper hard layer 31 and the lower hard layer 32 are made of 95-100A high-hardness polyurethane rubber materials, and the die closing and vulcanizing time is 45 min. The second vulcanization temperature is 100 ℃, and the vulcanization time is 14 h.
During installation, the left rubber core 1 and the right rubber core 2 form a hollow cylindrical structure, the two spacer bushes 3 form a cylindrical structure, and the hollow cylindrical structure is located in the cylindrical structure. Namely, the arc inner wall of the spacer 3 is contacted with the right rubber core 2 and the arc outer wall of the left rubber core 1. The left hard layer 11 and the right hard layer 21 surround to form a finished hard ring layer. The left softer layer 12 and the right softer layer 22 constitute the finished softer ring layer. The upper hard layer 31 is adjacent to the left hard layer 11 and the right hard layer 21. The joint seam of the left rubber core 1 and the right rubber core 2 is staggered with the joint seam of the two spacer bushes 3.
Seal assembly adopts components of a whole that can function independently structural design in this embodiment, can comparatively conveniently install, improves the installation effectiveness.
The sealing assembly in the embodiment is placed in an experimental device, the highest pressure of the experiment is 72MPa, and the coiled tubing is pulled up and down to 35300 m. And after the rubber core and the spacer bush are taken out, the inner circle of the left rubber core and the right rubber core is abraded by 42g, the upper hard layer, the middle soft layer and the lower hard layer of the spacer bush are slightly delaminated, and the delaminated surface is a non-smooth surface.
As can be seen from the detection results, the sealing assembly has the advantages of small abrasion loss, no obvious delamination and long service life in the process of taking off and putting down the coiled tubing.
Example 4
The embodiment provides a prevent spouting box rubber core seal assembly, and this seal assembly's structure is unanimous with in embodiment 3, and the difference lies in:
when the left rubber core 1 and the right rubber core 2 are prepared, the left soft layer 12 and the right soft layer 22 are made of 84-86A low-hardness polyurethane rubber materials, and the die assembly and vulcanization time is 5 min. The left hard layer 11 and the right hard layer 21 are made of 90-95A high-hardness polyurethane rubber materials, the die closing vulcanization pressure is 5MPa, and the vulcanization time is 30 min. The second vulcanization temperature is 100 ℃, and the vulcanization time is 16 h.
When the spacer 3 is prepared, the middle soft layer 32 is made of 55-60A of low-hardness polyurethane rubber material, and the die closing and vulcanizing time is 10 min. The upper hard layer 31 and the lower hard layer 32 are made of 90-95A high-hardness polyurethane rubber materials, and the die closing and vulcanizing time is 50 min. The second vulcanization temperature is 100 ℃, and the vulcanization time is 16 h.
The sealing assembly in the embodiment is placed in an experimental device, the highest pressure of the experiment is 58MPa, and the coiled tubing is pulled down for 25300 m. After the rubber core and the spacer bush are taken out, the inner circle of the left rubber core and the right rubber core is abraded by 68g, the upper hard layer, the middle soft layer and the lower hard layer of the spacer bush are slightly delaminated, and the delaminated surface is a non-smooth surface.
As can be seen from the detection results, the sealing assembly has the advantages of small abrasion loss, no obvious delamination and long service life in the process of taking off and putting down the coiled tubing.
Claims (10)
1. Prevent spouting box rubber core seal assembly, its characterized in that includes:
the left rubber core is provided with a left hard layer and a left soft layer from top to bottom and is integrally processed by a vulcanization process;
the right rubber core is provided with a right hard layer and a right soft layer from top to bottom and is integrally processed by the same processing technology as the left rubber core; the right rubber core and the left rubber core are folded left and right to form a complete hollow cylindrical structure;
the semi-arc sheet-shaped spacer bush is provided with an upper hard layer, a middle soft layer and a lower hard layer from top to bottom and is integrally processed by a vulcanization process; the two spacers surround to form a cylinder structure;
wherein, when in use, the hollow cylindrical structure is positioned inside the cylindrical structure.
2. The blowout preventer cartridge apex seal assembly according to claim 1, wherein the vulcanization process of the left or right apex comprises the steps of,
step 1, preheating a mold at the preheating temperature of 100-120 ℃;
step 2, adding a low-hardness polyurethane rubber material into the mold, closing the mold and vulcanizing for 3-8 min to obtain a lower rubber core semi-finished product;
step 3, opening the mold, keeping the lower rubber core semi-finished product in the mold, cleaning burrs and burrs, and treating the top surface of the lower rubber core semi-finished product;
step 4, adding a high-hardness polyurethane rubber material into the mold, closing the mold and vulcanizing, wherein the pressure is 4-10 MPa, and the vulcanizing time is 25-45 min;
step 5, demolding to obtain a semi-finished product of the rubber core;
and 6, vulcanizing the semi-finished rubber core in two stages at the vulcanization temperature of 80-160 ℃ for 10-24 h to obtain the rubber core.
3. The blowout preventer package packing assembly of claim 1, wherein the vulcanization of the spacer comprises the steps of,
step 1, preheating a mold at the preheating temperature of 110-120 ℃;
step 2, adding a low-hardness polyurethane rubber material into the mold, closing the mold and vulcanizing for 6-10 min to obtain a semi-finished product of the middle spacer;
step 3, opening the mold, keeping the middle spacer bush semi-finished product in the mold, cleaning burrs and burrs, and treating the top surface and the bottom surface of the middle spacer bush semi-finished product;
step 4, adding a high-hardness polyurethane rubber material into the mold, wherein the high-hardness polyurethane rubber material is respectively positioned at the top surface and the bottom surface of the middle spacer bush semi-finished product, and performing mold closing and vulcanization for 40-60 min;
step 5, demolding to obtain a semi-finished spacer bush product;
and 6, vulcanizing the semi-finished spacer bush in a second stage for 10-24 hours to obtain the spacer bush.
4. The blowout prevention box rubber core sealing assembly according to claim 2 or 3, wherein in the step 3, when the top surface of the lower rubber core semi-finished product is treated, acetone, alcohol, butanone, ethyl acetate or methanol is used for wiping for 2-5 times.
5. The blowout preventer package packing element seal assembly of claim 2 or claim 3, wherein the low durometer urethane rubber material of step 2 and the high durometer urethane rubber material of step 4 are added with color concentrates that are different or the same in color.
6. The blowout preventer cartridge gel-pack seal assembly according to claim 1, wherein the left gel pack, the right gel pack, and the spacer have uniform axial lengths;
the axial thickness of the left hard layer is consistent with that of the right hard layer, and is smaller than that of the left soft layer;
the axial thickness of the upper hard layer is consistent with that of the lower hard layer, is smaller than that of the middle soft layer, and is smaller than that of the left hard layer.
7. The blowout preventer package packing element seal assembly according to claim 1, wherein mating grooves and protrusions are formed on the mating surfaces of the right packing element and the left packing element.
8. The blowout preventer gel-core seal assembly according to claim 1, wherein the left and right hard layers have an axial thickness that is equal to or greater than an axial thickness of the upper or lower hard layers.
9. The blowout prevention box rubber core sealing assembly according to claim 2, wherein in the vulcanization process of the left rubber core or the right rubber core, the left soft layer and the right soft layer are made of 80-86A of low-hardness polyurethane rubber materials, and the left hard layer and the right hard layer are made of 90-100A of high-hardness polyurethane rubber materials.
10. The blowout prevention box rubber core sealing assembly according to claim 3, wherein in the vulcanization process of the spacer sleeve, the middle soft layer is made of 50-60A of low-hardness polyurethane rubber material, and the upper hard layer and the lower hard layer are made of 90-100A of high-hardness polyurethane rubber material.
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| CN207420524U (en) * | 2017-07-11 | 2018-05-29 | 广州加士特密封技术有限公司 | A kind of dissection type sealing ring |
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| CN112045914A (en) * | 2020-08-25 | 2020-12-08 | 河北华密橡胶科技股份有限公司 | Method for manufacturing multilayer multi-hardness polyurethane rubber core |
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