A multi-petal combined rubber core for annular blowout preventer

Abstract

The utility model discloses a kind of multi-petal combined rubber core for annular blowout preventer, it is related to annular blowout preventer technical field, including rubber core petal, rubber core petal includes metal framework and the elastomer of coating in the outside of metal framework;Rubber core petal is multiple, multiple rubber core petal head-to-tail sequentially link and seal and be sealed into complete annular sealing rubber core body, the outer circumferential wall surface of annular sealing rubber core body is the part of spherical surface.The utility model can effectively disperse the stress generated in the bottom during annular blowout preventer rubber core movement extrusion process, prevent rubber breakage, extend rubber core life;And can realize rubber core convenient disassembly, reduce maintenance time and cost, can guarantee oil and gas safe and smooth exploitation, with good adaptability and flexibility, can be customized and adjusted according to different well control needs, with wide application prospect.

Description

Technical Field

[0001] This utility model relates to the field of annular blowout preventer technology, and in particular to a multi-lobed composite rubber core for annular blowout preventers. Background Technology

[0002] Annular blowout preventers (BOPs) are critical equipment used in oil drilling operations to control wellhead pressure. Their rubber core is the core component, used to seal the wellhead and prevent blowouts. Traditional annular BOP rubber cores are mostly of a single-piece structure, especially spherical cores, which suffer from short service life; stress concentration at the bottom rubber makes them prone to breakage, leading to premature failure; and single-piece cores are difficult to replace and maintain, and cannot be repaired locally. Especially in ultra-deep well operations, the sealing performance and fatigue life of conventional single-piece cores are insufficient to meet requirements.

[0003] Therefore, in order to improve the sealing performance and service life of the rubber core of the annular blowout preventer, how to design a multi-lobe combined rubber core for the annular blowout preventer that can effectively disperse the stress generated during the extrusion process of the rubber core, prevent rubber damage, extend the service life of the rubber core, and achieve convenient disassembly and assembly of the rubber core is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0004] In view of this, the present invention proposes a multi-lobe combined rubber core for annular blowout preventers, aiming to solve at least one of the above-mentioned technical problems.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: This utility model provides a multi-lobe combined rubber core for annular blowout preventers, comprising: A rubber core flap, the rubber core flap comprising a metal skeleton and an elastomer covering the outside of the metal skeleton; The core flaps are multiple, and the multiple core flaps are connected end to end and sealed to form a complete annular sealing core. The outer peripheral wall of the annular sealing core is part of a sphere.

[0006] This invention relates to a multi-lobed composite rubber core for annular blowout preventers. Through its multi-lobed design, multiple core lobes are connected end-to-end to form a complete annular sealing core. This effectively disperses the bottom stress during the core's movement and compression process, preventing stress concentration at the bottom of the core and thus significantly extending its service life. The multi-lobed design and assembly also make core installation and replacement more convenient. Individually damaged core lobes can be replaced separately, reducing maintenance time and costs.

[0007] As a further improvement to the above technical solution, the elastomer is arc-shaped; there are multiple metal skeletons, and the multiple metal skeletons are sequentially and spaced apart within the elastomer along the circumference of the elastomer.

[0008] The beneficial effects of the above technical solution are: the metal skeleton is wrapped inside the elastomer, and the metal skeleton plays the role of supporting and restricting the movement trajectory of the elastomer. Especially when the fluidity of the elastomer increases at high temperatures, the metal skeleton can effectively constrain the elastomer to ensure its sealing performance on the tubing.

[0009] As a further improvement to the above technical solution, both ends of the elastomer along its circumference are elastic sealing planes.

[0010] The beneficial effects of the above technical solution are: the mutual contact between the circumferential end faces of the multiple rubber core flaps is the simplest combination method, which facilitates assembly operations; the elastic sealing planes of two adjacent elastic bodies are both complete smooth planes, and after the multiple rubber core flaps are combined, the smooth planes that are in contact with each other can achieve effective sealing.

[0011] As a further improvement to the above technical solution, the elastomer is a rubber body; the elastomer has rubber teeth on one end face along its circumference; the elastomer has rubber grooves on the other end face along its circumference; both ends of the rubber grooves along the radial direction of the elastomer are open; the rubber teeth of any one of the rubber core pieces can be fitted and sealed into the rubber groove of the other adjacent rubber core piece.

[0012] The beneficial effects of the above technical solution are: by setting rubber teeth and rubber grooves at both ends of the elastomer, it is possible to achieve interlocking and meshing assembly between adjacent elastomers, and quick positioning and alignment can be achieved during installation; by interlocking and limiting, multiple rubber core flaps are connected into one to form a complete annular sealing rubber core, ensuring stable sealing performance.

[0013] As a further improvement to the above technical solution, an elastic sealing groove is formed on the outer side of one end of the elastomer along its circumference; an elastic sealing boss is formed on the outer side of the other end of the elastomer along its circumference; the elastic sealing boss of any one of the rubber core flaps can be adapted to be sealed and embedded in the elastic sealing groove of the other adjacent rubber core flap.

[0014] The beneficial effects of the above technical solution are: by setting the interlocking rubber core petals to an interlaced cross-sectional connection structure, and using the interlaced limiting and bonding assembly of the elastic body stepped surface, the multiple rubber core petals are connected into a whole to form a complete annular sealing rubber core during installation, thus ensuring stable sealing performance.

[0015] As a further improvement to the above technical solution, an elastic body embedded groove is formed on one end face of the elastomer along its circumference; the elastic body embedded groove corresponds to one side end opening on the outer side of the elastomer; an elastomer boss is formed on the other end face of the elastomer along its circumference; the elastomer boss of any one of the core flaps can be adapted to be sealed and embedded in the elastic body embedded groove of the other adjacent core flap.

[0016] The beneficial effects of the above technical solution are as follows: by setting the interlocking rubber core flaps with pluggable bosses and embedded grooves, and using elastic body limiting pluggable assembly, the bosses and grooves between adjacent rubber core flaps can be plugged into each other to limit the connection, thereby connecting multiple rubber core flaps into a whole to form a complete annular sealing rubber core, ensuring stable sealing performance.

[0017] As a further improvement to the above technical solution, an elastomer slot is formed on one end face of the elastomer along its circumference; the elastomer slot has an opening on one side of the bottom surface of the elastomer; a metal skeleton insert is connected to the other end of the elastomer along its circumference; the metal skeleton insert of any one of the core flaps can be inserted into the elastomer slot of the other core flap adjacent to it.

[0018] The beneficial effects of the above technical solution are: by setting the interlocking rubber core flaps as the insertion limiting structure of the metal boss and the elastic slot, the installation can be quickly positioned and aligned, and the stability and firmness of the insertion between multiple rubber core flaps are ensured.

[0019] As a further improvement to the above technical solution, the end of the metal skeleton insert away from the corresponding elastomer is inserted into the elastomer slot and has a gap between it and the bottom wall of the elastomer slot.

[0020] The beneficial effects of the above technical solution are: by setting a gap between the insertion end of the metal frame plug and the bottom wall of the elastomer slot, the elastomer slot can be protected, thus improving connection stability and ensuring durability.

[0021] As a further improvement to the above technical solution, the other end of the metal frame insert is inserted into the interior of the elastomer and fixedly connected to the metal frame.

[0022] The beneficial effects of the above technical solution are: by fixing the metal skeleton insert to the metal skeleton embedded in the corresponding elastomer, the stability and durability of the structure are further improved.

[0023] As can be seen from the above technical solution, compared with the prior art, this utility model discloses a multi-lobe combined rubber core for annular blowout preventers, which has the following advantages and beneficial effects: 1. This utility model effectively disperses the stress on the bottom rubber during the extrusion process of the annular blowout preventer core through a multi-lobed design, solving the problem of bottom rubber damage and short lifespan caused by stress concentration at the bottom of the integral core.

[0024] 2. This utility model, through its multi-lobed design, makes the installation and replacement of the rubber core more convenient, improves the overall sealing performance of the blowout preventer, and allows for individual replacement of damaged rubber cores, reducing maintenance time and costs and ensuring the safety of oil and gas extraction. Furthermore, this design has good adaptability and flexibility, and can be customized and adjusted according to different well control needs, showing broad application prospects. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0026] Figure 1 This utility model presents a three-dimensional schematic diagram of the combined state of a multi-lobed composite rubber core for a ring-shaped blowout preventer. Figure 2 This utility model presents a schematic diagram of the elastic sealing plane of a multi-lobed combined rubber core for an annular blowout preventer. Figure 3 This utility model provides a schematic diagram of the rubber teeth and rubber groove structure of a multi-lobed composite rubber core for an annular blowout preventer. Figure 4 This utility model provides a schematic diagram of the elastic sealing groove and elastic sealing boss structure of a multi-lobed combined rubber core for an annular blowout preventer. Figure 5 This utility model presents a schematic diagram of the elastic body embedded groove and elastic body boss structure of a multi-lobed combined rubber core for an annular blowout preventer. Figure 6 This utility model presents a schematic diagram of the elastomeric slot and metal frame insert structure of a multi-lobed composite rubber core for a ring-shaped blowout preventer. Figure 7 This utility model provides a schematic diagram of the insertion state of the elastomeric slot and the metal frame insert of a multi-lobed composite rubber core for a ring-shaped blowout preventer. In the diagram: 1. Rubber core flap; 11. Elastomer; 101. Elastic sealing plane; 1011. Rubber teeth; 1012. Rubber tooth groove; 1013. Elastic sealing groove; 1014. Elastic sealing boss; 1015. Elastic embedded groove; 1016. Elastomer boss; 1017. Elastomer slot; 1018. Metal skeleton insert; 12. Metal skeleton. Detailed Implementation

[0027] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model. In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified. In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances. According to the embodiments of this utility model, such as Figures 1 to 7 As shown, a multi-lobe combined rubber core for an annular blowout preventer includes: a rubber core lobe 1, the rubber core lobe 1 including a metal skeleton 12 and an elastomer 11 covering the outside of the metal skeleton; there are multiple rubber core lobes 1, the multiple rubber core lobes 1 are connected end to end and sealed to form a complete annular sealing rubber core body, the outer peripheral wall of the annular sealing rubber core body is part of a sphere.

[0028] This embodiment presents a multi-lobed composite rubber core for an annular blowout preventer (BOP). It is installed in the vertical space between the inner spherical surface of the top cover and the supporting piston within the annular BOP. After installation, the hydraulic drive of the annular BOP pushes the piston to apply pressure to the rubber core, causing each rubber core lobe 1 to deform uniformly and move evenly along the inner spherical surface of the annular top cover towards the center of the BOP, ultimately clamping the tubing string inside the well to form an effective seal. The multi-lobed design allows multiple rubber core lobe 1 to be connected end-to-end to form a complete annular sealing rubber core, effectively dispersing the bottom stress during the rubber core's movement and compression process. This effectively prevents bottom rubber damage caused by stress concentration, significantly improving the rubber core's service life. This invention, through its multi-lobed design and assembly, makes the installation and replacement of the rubber core more convenient. Individually damaged rubber core lobe 1 can be replaced separately, reducing maintenance time and costs.

[0029] Specifically, the core 1 of the multi-lobe composite rubber core used in the annular blowout preventer is formed by vulcanizing a metal skeleton 12 and a high-strength elastomer 11. The elastomer 11 can be made of a high-strength, highly elastic rubber material.

[0030] In some embodiments, the elastomer 11 is arc-shaped; there are multiple metal skeletons 12, which are sequentially and spaced apart within the elastomer 11 along the circumference of the elastomer 11.

[0031] The metal skeleton 12 is enclosed within the elastomer 11. The metal skeleton 12 serves to support and restrict the movement trajectory of the elastomer. Especially when the elastomer's fluidity increases at high temperatures, the metal skeleton 12 can effectively constrain the elastomer 11 to ensure its sealing performance on the tubing.

[0032] Specifically, the lower part of the metal skeleton 12 is embedded inside the elastomer 11. The outer surface of each core flap 1 has a spherical curved surface structure so that multiple core flaps 1 can be assembled to form a spherical core. The spherical core has an axial sealing through hole in the middle for sealing the outer periphery of the tube column.

[0033] In some embodiments, both ends of the elastomer 11 along its circumference are elastic sealing planes 101.

[0034] Specifically, the elastic sealing plane 101 is designed as a smooth plane; the circumferential end faces of the multiple rubber core flaps 1 are fitted together, which is the simplest combination method and facilitates assembly operation; the elastic sealing planes 101 of two adjacent elastic bodies 11 are both complete smooth planes, and after the multiple rubber core flaps 1 are combined, the smooth planes that are fitted together can achieve effective sealing.

[0035] During installation, each individual rubber core flap 1 should be placed sequentially on the upper surface of the annular blowout preventer piston, ensuring that the elastic sealing surfaces 101 at opposite ends of adjacent rubber core flaps 1 are in complete contact and fit together, until all rubber core flaps 1 are evenly spliced ​​together to form a complete spherical sealing ring.

[0036] In some embodiments, the elastomer 11 is a rubber body; one end face of the elastomer 11 along its circumferential direction is provided with rubber teeth 1011; the other end face of the elastomer 11 along its circumferential direction is provided with rubber grooves 1012; both ends of the rubber grooves 1012 along the radial direction of the elastomer 11 are open; the rubber teeth 1011 of any one core flap 1 can be adapted and sealed into the rubber grooves 1012 of the other core flap 1 adjacent to it.

[0037] By setting rubber teeth 1011 and rubber grooves 1012 at both ends of the elastomer 11, it is possible to achieve interlocking and meshing assembly between adjacent elastomers 11, which can be quickly positioned and aligned during installation; by interlocking and limiting, multiple rubber core pieces 1 are connected into a whole to form a complete annular sealing rubber core, ensuring stable sealing performance.

[0038] Specifically, the rubber teeth 1011 can be helical rubber teeth, and the rubber tooth grooves 1012 can be helical rubber tooth grooves.

[0039] Specifically, the rubber tooth 1011 is a trapezoidal rubber tooth, and the rubber tooth groove 1012 is a trapezoidal rubber tooth groove.

[0040] Specifically, the rubber teeth 1011 at one end of one rubber core flap 1 can be interlocked with the rubber grooves 1012 at the other end of another rubber core flap 1. During installation, each independent rubber core flap 1 needs to be pushed radially into the space on the upper surface of the annular blowout preventer piston in sequence, so that the rubber teeth 1011 are completely embedded in the rubber grooves 1012. This can achieve rapid positioning while forming an interlocked seal, until all the rubber core flaps 1 are evenly interlocked circumferentially to form a complete spherical sealing ring. In some embodiments, an elastic sealing groove 1013 is formed on the outer side of one end of the elastomer 11 along its circumference; an elastic sealing boss 1014 is formed on the outer side of the other end of the elastomer 11 along its circumference; the elastic sealing boss 1014 of any one of the core flaps 1 can be adapted to be sealed and embedded in the elastic sealing groove 1013 of the other core flap 1 adjacent to it.

[0041] By setting the interlocking rubber core petals 1 to an interlaced cross-sectional connection structure, and using the interlaced limiting and bonding of the elastic body stepped surface for assembly, the multiple rubber core petals 1 are connected into a whole to form a complete annular sealing rubber core, thus ensuring stable sealing performance.

[0042] Specifically, the elastic sealing groove 1013 at one end of one rubber core flap 1 can be matched and fitted with the stepped surface of the elastic sealing boss 1014 at the other end of another rubber core flap 1. During installation, each independent rubber core flap 1 needs to be hoisted and placed sequentially into the space on the upper plane of the annular blowout preventer piston with the center of the blowout preventer as the axis, and ensure that the elastic sealing groove 1013 at the opposite ends of adjacent rubber core flaps 1 is matched and fitted with the elastic sealing boss 1014, until all rubber core flaps 1 are uniformly spliced ​​together to form a complete spherical sealing ring.

[0043] In some embodiments, an elastic body recess 1015 is formed on one end face of the elastomer 11 along its circumference; the elastic body recess 1015 corresponds to one side end opening on the outer side of the elastomer 11; an elastomer boss 1016 is formed on the other end face of the elastomer 11 along its circumference; the elastomer boss 1016 of any one core flap 1 can be adapted to be sealed and embedded in the elastic body recess 1015 of the other core flap 1 adjacent to it.

[0044] By setting interlocking bosses and recessed grooves between the interconnected rubber core flaps 1, and using elastic body for interlocking assembly, the bosses and grooves between adjacent rubber core flaps 1 interlock and limit each other during installation, connecting multiple rubber core flaps 1 into a complete annular sealing rubber core body, thus ensuring stable sealing performance.

[0045] During installation, each independent rubber core flap 1 should be pushed radially into the space on the upper plane of the annular blowout preventer piston with the center of the blowout preventer as the axis, and the embedded grooves 1015 and the elastic protrusions 1016 at opposite ends of the adjacent rubber core flaps 1 should be limited and inserted until all the rubber core flaps 1 are uniformly spliced ​​together to form a complete spherical sealing ring.

[0046] In some embodiments, an elastomer slot 1017 is formed on one end face of the elastomer 11 along its circumference; the elastomer slot 1017 corresponds to one side end opening of the bottom surface of the elastomer 11; a metal skeleton insert 1018 is connected to the other end of the elastomer 11 along its circumference; the metal skeleton insert 1018 of any one of the core flaps 1 can be inserted into the elastomer slot 1017 of the other core flap 1 adjacent to it.

[0047] By setting the interconnected core flaps 1 as a plug-in limiting structure of metal bosses and elastic slots, quick positioning and alignment can be achieved during installation, and the stability and firmness of the plug-in between multiple core flaps 1 are ensured.

[0048] Specifically, the elastomer slot 1017 and the metal frame insert 1018 are both located near the bottom of the elastomer 11, which ensures convenient insertion between multiple rubber core flaps 1 without affecting the sealing performance between the elastic sealing planes 101 of adjacent rubber core flaps 1.

[0049] In some embodiments, the end of the metal frame insert 1018 away from the corresponding elastomer 11 is inserted into the elastomer slot 1017 and has a gap between it and the bottom wall of the elastomer slot 1017.

[0050] By setting a gap between the insertion end of the metal frame plug 1018 and the bottom wall of the elastomer slot 1017, the elastomer slot 1017 can be protected, thus improving connection stability and ensuring durability.

[0051] In some embodiments, the other end of the metal frame insert 1018 is inserted into the elastomer 11 and welded to the metal frame 12 for fixation.

[0052] By fixing the metal skeleton insert 1018 to the metal skeleton 12 embedded inside the corresponding elastomer 11, the stability and durability of the structure are further improved.

[0053] During installation, the first independent rubber core flap 1 should be placed vertically on the upper surface of the blowout preventer piston. The elastic body slot 1017 of the second rubber core flap 1 should be accurately inserted into the metal skeleton insert 1018 of the first rubber core flap 1, until all rubber core flaps 1 are installed to form a complete spherical sealing ring. In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification. Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A multi-lobe composite rubber core for annular blowout preventers, characterized in that, include: The core flap (1) includes a metal skeleton (12) and an elastomer (11) covering the outside of the metal skeleton. The core flaps (1) are multiple, and the multiple core flaps (1) are connected end to end and sealed to form a complete annular sealing core body. The outer peripheral wall of the annular sealing core body is part of a sphere.

2. The multi-lobe combined rubber core for annular blowout preventers according to claim 1, characterized in that, The elastic body (11) is arc-shaped; there are multiple metal skeletons (12), and the multiple metal skeletons (12) are sequentially and spaced apart in the elastic body (11) along the circumference of the elastic body (11).

3. The multi-lobe combined rubber core for an annular blowout preventer according to claim 2, characterized in that, The elastic body (11) has two elastic sealing planes (101) on both ends along its circumference.

4. The multi-lobe combined rubber core for an annular blowout preventer according to claim 3, characterized in that, The elastic body (11) is a rubber body; the elastic body (11) has rubber teeth (1011) on one end face along its circumference; the elastic body (11) has rubber grooves (1012) on the other end face along its circumference; the rubber grooves (1012) are open at both ends along the radial direction of the elastic body (11); the rubber teeth (1011) of any one of the rubber core flaps (1) can be fitted and sealed into the rubber grooves (1012) of the other adjacent rubber core flap (1).

5. The multi-lobe combined rubber core for an annular blowout preventer according to claim 3, characterized in that, The elastic body (11) has an elastic sealing groove (1013) formed on the outer side of one end along its circumference; the elastic body (11) extends along its other end along its circumference to form an elastic sealing boss (1014); the elastic sealing boss (1014) of any one of the core flaps (1) can be adapted to be sealed and embedded in the elastic sealing groove (1013) of the other core flap (1) adjacent to it.

6. The multi-lobe combined rubber core for an annular blowout preventer according to claim 3, characterized in that, The elastic body (11) has an embedded groove (1015) formed on one end face along its circumference; the embedded groove (1015) corresponds to the opening on one side of the outer side of the elastic body (11); the elastic body (11) has an elastic body boss (1016) formed on the other end face along its circumference; the elastic body boss (1016) of any one of the core flaps (1) can be adapted to be sealed and embedded in the embedded groove (1015) of the other core flap (1) adjacent to it.

7. The multi-lobe combined rubber core for an annular blowout preventer according to claim 3, characterized in that, The elastic body (11) has an elastic body slot (1017) formed on one end face along its circumference; the elastic body slot (1017) corresponds to one side opening of the bottom surface of the elastic body (11); the other end of the elastic body (11) along its circumference is connected to a metal skeleton insert (1018); the metal skeleton insert (1018) of any one of the core flaps (1) can be inserted into the elastic body slot (1017) of the other core flap (1) adjacent to it.

8. The multi-lobe combined rubber core for an annular blowout preventer according to claim 7, characterized in that, The metal skeleton insert (1018) is inserted into the elastomer slot (1017) at one end away from the corresponding elastomer (11) and has a gap between it and the bottom wall of the elastomer slot (1017).

9. A multi-lobe combined rubber core for an annular blowout preventer according to claim 8, characterized in that, The other end of the metal frame insert (1018) is inserted into the elastomer (11) and fixedly connected to the metal frame (12).

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