High-strength bearing ring for wellhead

Abstract

The utility model relates to the technical field of oil and gas devices, in particular to a high-strength bearing ring for a wellhead, which comprises a bearing ring, the bearing ring is clamped in an annular slot in a shaft, and a hanger placed in the shaft is borne on the bearing ring; the bearing ring is of an annular structure formed by combining three split rings, and the split rings are of arc-shaped structures, so that the bearing ring can be conveniently and rapidly installed in a hoistway in a split mode; the combined end faces of the adjacent split rings are binding faces, pin holes are formed in the surfaces, at the binding faces, of the split rings, and pins are placed in the pin holes. The single pin hole is located in the two adjacent split rings at the same time, and when the attaching faces of the adjacent split rings are attached together, the pin hole and the pin are connected in an inserted mode in a matched mode, so that the annular bearing ring is fixed into a whole, and stability is improved. According to the utility model, the hanger can be quickly mounted in the hoistway, and the hanger can be borne in a high-strength manner.

Description

Technical Field

[0001] This utility model relates to the field of oil and gas equipment technology, and more specifically, to a high-strength bearing ring for wellheads. Background Technology

[0002] An oil and gas wellbore refers to the passageway from the surface to the target reservoir, serving as the core structure connecting underground oil and gas resources with surface extraction equipment. Its primary function is to provide a path for oil and gas to flow from the formation to the surface and to support downhole equipment such as tubing and hangers.

[0003] As the connecting hub between the wellbore and the surface production tree, the hanger is generally mounted at the wellhead to bear the weight of the tubing and downhole pressure; and to provide a pressure seal between the tubing and casing to prevent oil and gas leakage.

[0004] In oil and gas well or downhole operations, the "suspension" of a hanger refers to fixing the hanger to a target position within the wellbore using specific technical means to achieve stable suspension and sealing of casing, tailpipe, or other tools. Currently, the most widely used hanger suspension methods for oil and gas wellhead equipment are either suspension with a 45° protrusion on the wellbore inner wall or layered suspension suspension. However, these methods may encounter issues with the load-bearing capacity of the wellbore steps when dealing with heavier hangers, or require the entire wellhead body to be made of high-strength materials to compensate for the increased load-bearing capacity, thus increasing material costs. Utility Model Content

[0005] The purpose of this application is to provide a high-strength bearing ring for wellheads, which enables rapid installation into the wellbore and addresses the technical problem of high-strength bearing suspension.

[0006] To solve the above-mentioned technical problems, the solution adopted in this application is as follows:

[0007] A high-strength bearing ring for wellhead use, comprising a bearing ring.

[0008] Preferably, the bearing ring is snapped into an annular slot in the shaft, and the bearing ring carries a hanger placed in the shaft.

[0009] Preferably, the bearing ring is composed of three separate rings combined to form a ring structure, and the separate rings are arc-shaped.

[0010] Preferably, the combined end face of the adjacent split rings is a mating surface, and a pin hole is provided on the surface of the split ring at the mating surface position, with a pin placed in the pin hole.

[0011] Preferably, the single pin hole is located on two adjacent split rings at the same time. When the mating surfaces of the adjacent split rings are mated together, the pin hole and the pin are matched and inserted.

[0012] Preferably, the three separate rings.

[0013] Preferably, the mating surfaces of the three separate rings are separated before they are engaged in the annular slot.

[0014] Preferably, when the pin holes on the three separate rings are matched and inserted with the pins, the mating surfaces of the three separate rings are mated together.

[0015] Preferably, when the pin holes on the three separate rings are matched and inserted with the pins, the mating surfaces of the three separate rings are fixedly connected.

[0016] Preferably, when the three separate rings are combined into a ring structure, the two ends of the three separate rings are respectively bonded to form three bonding surfaces.

[0017] Preferably, when two of the split rings are combined, the two ends of the last split ring are radially slidably connected to the unfitted ends of the other two split rings.

[0018] Preferably, the inner diameters of the three split rings are chamfered.

[0019] Preferably, the chamfered surface abuts against the bottom end of the hanger.

[0020] Preferably, the chamfer angle is 45 degrees.

[0021] Preferably, the chamfered surface of the split ring is provided with a pin hole, and the axial direction of the pin hole is perpendicular to the chamfered surface.

[0022] The technical solution of this application has at least the following advantages and beneficial effects:

[0023] In this invention, a high-strength bearing ring is snapped into the oil and gas wellbore, and its annular surface is used to support the hanger in the wellbore. This reduces the situation where the hanger is in contact with the wellbore for a long time and uses the wellbore for support, thereby reducing the occurrence of wellbore damage.

[0024] In this invention, the bearing ring is designed as a three-lobed structure, consisting of three separate rings combined to form a ring shape. This allows the bearing ring to be quickly placed into the wellbore, preventing it from getting stuck. Furthermore, pin holes are provided between adjacent separate rings, and pins are placed in these holes to improve the fitting accuracy between the cross-sections of the separate rings, thus forming a complete ring structure for bearing.

[0025] In this invention, the three separate rings, after being positioned by a pin, are welded together at the joint to form a single, integral load-bearing ring. This allows for quick installation into the shaft using the separate rings, and the welding of the separate rings into a single unit improves the stability and load-bearing capacity of the load-bearing ring. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of this utility model.

[0027] Figure 2 This is a top view of the structure of this utility model.

[0028] Figure 3 This is a cross-sectional structural diagram of the present invention.

[0029] Figure 4 This is a cross-sectional structural diagram of the present invention when it is snapped into place in the wellbore to support the suspension device.

[0030] In the diagram: 1-splitting ring, 2-fitting surface, 3-pin hole, 4-chamfer, 5-well passage, 6-underwater suspension device. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] It should be noted that similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. The terms "center," "upper," "lower," "inner," and "outer," indicating orientation or positional relationships based on the orientation or positional relationships shown in the figures, or the orientation or positional relationships commonly used when the product is in use, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed or operated in a specific orientation, and therefore should not be construed as a limitation on this application. It should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two elements. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0033] In existing technologies, oil and gas wellheads require tubing hangers for wellhead sealing and connection transition. Therefore, the tubing hanger needs to be mounted in the wellbore, utilizing the chamfered grooves within the wellbore for support. During mounting, the tubing hanger rests directly on the inner wall of the wellbore.

[0034] Example 1

[0035] Please refer to Figure 1 and Figure 4 In this embodiment, a bearing ring is snapped into the wellbore 5 at the oil and gas wellhead. The bearing ring uses its annular surface to support the hanger placed in the wellbore 5, so that the hanger does not directly bear the wellbore 5. Thus, the bearing ring can support the heavier hanger while reducing the hanger's long-term contact with the wellbore 5, thereby reducing the occurrence of damage to the wellbore 5.

[0036] In order for the bearing ring to be installed inside the shaft, an annular groove is provided on the inner wall of the shaft for engaging and matching with the annular bearing ring.

[0037] Furthermore, if the bearing ring is a ring-shaped integral structure, when it is to be snapped into the shaft 5, the outer diameter of the bearing ring is larger than the inner diameter of the shaft 5, so the integral bearing ring is difficult to be directly placed into the shaft 5.

[0038] Therefore, in order to allow the bearing ring to be quickly placed inside the shaft 5, the bearing ring is designed with a three-lobed structure, consisting of three separate rings 1 combined together to form a ring. The separate rings 1 are arc-shaped and short in length, which facilitates quick separate installation into the annular slots provided inside the shaft 5, thus preventing the bearing ring from getting stuck inside the shaft 5.

[0039] Furthermore, the split rings 1 are sequentially placed into the annular slots within the shaft 5. During placement, because each split ring 1 is placed individually, the placement angle of each split ring 1 is uncertain, making it difficult for the cross-sections of each split ring 1 to fit together, resulting in gaps and making it difficult to form an annular structure.

[0040] Therefore, pin holes 3 are provided at the cross-sectional positions of adjacent split rings 1, and pins are placed in the pin holes 3 to improve the fitting accuracy between the cross-sections of the split rings 1 by using pin positioning.

[0041] The pin hole 3 is located at the cross-sectional position of the adjacent split ring 1. During the placement of the bearing ring, when the cross-sections of the adjacent split ring 1 approach each other, the pin hole 3 will gradually form at the adjacent cross-section position (at this time, the cross-sections are not fitted together, and the shape of the pin hole 3 is not hole-shaped). When the pin is inserted into the pin hole 3, the cross-sections of the adjacent split ring 1 that make up the pin hole 3 are squeezed by the pin, so that the shape of the pin hole 3 will gradually match the pin. After the pin hole 3 matches the pin, the cross-sections are fixed together and fitted together. The three split rings 1 are limited and fixed due to the fitting between the cross-sections, so that the three split rings 1 are limited to form a complete ring structure.

[0042] Furthermore, the three separate rings 1 are positioned by pins to form a ring-shaped load-bearing ring. However, at this time, the individual separate rings 1 are still in a separate state and have no connection relationship, because gaps will occur between the separate rings 1, resulting in low stability.

[0043] Therefore, after the three separate rings 1 are placed into the annular slot of the shaft 5 and positioned together by pins to form a ring-shaped load-bearing ring, the joints between the three separate rings 1 are welded together to form a single, integral load-bearing ring. This allows for quick installation of the separate rings 1 into the shaft 5 during installation, and the welding of the separate rings 1 into a single unit improves the stability and load-bearing capacity of the load-bearing ring.

[0044] It is worth noting that the bearing ring is permanently installed in the shaft 5. Therefore, after being installed separately in the shaft 5, it is welded and fixed into a whole and is no longer removed from the shaft 5.

[0045] Example 2

[0046] During the placement of the three split rings 1 into the annular slot of the shaft 5, the split rings 1 are placed radially along the annular slot (the axial direction of the bearing ring needs to bear the load, so the axial displacement of the split rings 1 needs to be restricted; therefore, the three split rings 1 cannot be axially inserted into the annular slot). The installation path is as follows: from the opening at the inner diameter of the annular slot, move radially towards the outer diameter of the annular slot, and enter the annular slot. Along this installation path, the first two split rings 1 can be placed quickly, but when the last split ring 1 is placed, the outer ring of the split ring 1 will be stuck by the inner rings of the other two split rings 1 (the width of the outer ring is greater than the width of the inner ring), and cannot enter the annular slot radially, thus failing to form a complete annular bearing ring.

[0047] Please refer to example 1 and... Figure 2 In this embodiment, the cross-sections of the three split rings 1 are glued together to form three bonding surfaces 2. The bonding surfaces formed by the first two split rings 1 placed in the annular slot are not limited (the bonding surfaces can be flat or stepped surfaces). The last split ring 1 placed in the annular slot has its two ends matched with the cross-sections of the first two split rings 1 to form bonding surfaces 2. In order to be successfully embedded in the annular slot, the cross-section of the last split ring 1 needs to be radially slidably matched with the cross-sections of the first two split rings 1, so that the last split ring 1 can slide radially into the annular slot to form a complete annular bearing ring.

[0048] In this embodiment, specifically, the cross-sections of the first two split rings 1 placed in the annular slots that fit together are planes, and the two ends of the last split ring 1 are inclined planes, and the two inclined planes are parallel. Therefore, the cross-sections of the first two split rings 1 and the last split ring 1 that match are also parallel inclined planes, so that the last split ring 1 can slide radially between the first two fitted split rings 1 to form an annular bearing ring.

[0049] Example 3

[0050] Please refer to Figure 3 In this embodiment, the inner diameter of the three split rings 1 (i.e., the formed bearing rings) is provided with chamfers 4. When the hanger is mounted on the bearing ring, the bearing point is located on the surface of the chamfer 4, which is consistent with the bearing method of using the chamfer 4 groove in the well 5 in the prior art. This does not change the bearing position when the hanger is mounted, reduces the amount of modification to the equipment, and reduces the failure rate of the equipment.

[0051] The chamfer 4 angle is set to 45 degrees. When the bottom of the hanger sits on the chamfer 4 surface of the bearing ring, the gravity of the hanger acts on the chamfer 4 surface. The force is divided into axial and radial components by the chamfer 4 surface. The 45-degree angle of the chamfer 4 makes the axial and radial components the same, so that they are evenly applied to the bearing ring and the shaft 5, avoiding excessive force in one direction, which could cause premature damage to the bearing ring or shaft 5.

[0052] Please refer to Figure 1 In this embodiment, the pin hole 3 is located on the chamfered surface 4 of the split ring 1, and the axial direction of the pin hole 3 is perpendicular to the chamfered surface 4. This allows the pin hole 3 to be tilted on the bearing ring, facing obliquely upwards towards the shaft 5. During the pin positioning process of the split ring 1, the pin needs to be inserted from the shaft 5 into the pin hole 3 of the bearing ring, and after insertion and matching, welding is performed. Therefore, to reduce the possibility of the pin detaching itself from the pin hole 3, the pin hole 3 is tilted, which facilitates the insertion of the pin from above the shaft 5 and reduces the occurrence of the pin detaching from the pin hole 3 during welding.

[0053] The various embodiments of this utility model have now been described in detail. To avoid obscuring the concept of this utility model, some details known in the art have not been described. Those skilled in the art will fully understand how to implement the technical solution of this utility model based on the above description. The scope of this utility model is defined by the appended claims.

Claims

1. A high-strength bearing ring for wellhead applications, comprising a bearing ring, characterized in that... ； The bearing ring is snapped into the annular slot in the shaft (5), and the bearing ring carries the hanger placed in the shaft (5); The bearing ring is formed by combining three separate rings (1) to form a ring structure, and the separate rings (1) are arc-shaped structures; The combined end face of the adjacent split rings (1) is the mating surface (2), and a pin hole (3) is provided on the surface of the split ring (1) at the mating surface (2), and a pin is placed in the pin hole (3); The single pin hole (3) is located on two adjacent split rings (1) at the same time. When the mating surfaces (2) of the adjacent split rings (1) are mated together, the pin hole (3) is matched and inserted with the pin.

2. The high-strength bearing ring for wellheads according to claim 1, characterized in that, The three separate rings (1); Before the three split rings (1) are snapped into the annular slot, the mating surfaces (2) of the three split rings (1) are separated. When the pin holes (3) on the three split rings (1) are matched and inserted with the pins, the mating surfaces (2) of the three split rings (1) are mated together. When the pin holes (3) on the three split rings (1) are matched and inserted with the pins, the mating surfaces (2) of the three split rings (1) are fixedly connected.

3. A high-strength bearing ring for wellheads according to claim 1, characterized in that, When the three separate rings (1) are combined into a ring structure, the two ends of the three separate rings (1) are respectively bonded to form three bonding surfaces (2); When two of the split rings (1) are combined, the two ends of the last split ring (1) are radially slidably connected to the unfitted ends of the other two split rings (1).

4. A high-strength bearing ring for wellheads according to claim 1, characterized in that, The inner diameter of the three split rings (1) is provided with chamfers (4); The chamfered (4) surface abuts against the bottom end of the hanger.

5. A high-strength bearing ring for wellheads according to claim 4, characterized in that, The chamfer (4) angle is 45 degrees.

6. A high-strength bearing ring for wellheads according to claim 4, characterized in that, The chamfered (4) surface of the split ring (1) is provided with a pin hole (3), and the axial direction of the pin hole (3) is perpendicular to the chamfered (4) surface.

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