Eccentric tubing hanger with guide structure

Abstract

The utility model relates to the field of oil exploitation, in particular to an eccentric oil pipe hanger with a guide structure, which comprises an upper meter pipe and a lower meter pipe, the upper meter pipe is connected with the lower meter pipe through a bolt, the top end of an inner cavity of the lower meter pipe is connected with an annular connecting seat, the top of the annular connecting seat is connected with an eccentric cylinder with a conical bottom, and the eccentric cylinder is connected with a guide structure. A limiting and clamping assembly with a guiding function is arranged at the top of the annular connecting base and located on the outer circle of the eccentric cylinder, and a plurality of jackscrews in threaded connection are arranged on the outer side of the lower meter pipe. Axial and radial loads are dispersed through conical surface matching of the conical limiting guide pieces, the space utilization rate of a complex well type is increased, eccentric wear caused by contact of an oil pipe and the inner wall of a sleeve is avoided, meanwhile, the eccentric barrel is driven by the driving assembly to move downwards to be tightly attached to the inner side of the limiting clamping assembly, and the sealing effect is improved. And the moving range of the eccentric barrel is limited, accurate setting of the tubing string is ensured, and therefore the installation efficiency of the oil extraction system is improved.

Description

Technical Field

[0001] This utility model relates to the field of oil extraction, and in particular to an eccentric tubing hanger with a guiding structure. Background Technology

[0002] An eccentric hanger is a specially designed downhole tool used in oil, gas, and geothermal extraction. It is mainly used in oilfield well operations to suspend tubing and ensure its vertical positioning. It also has anti-wear and anti-slip functions. It is a device that achieves both straightening and suspension functions through an eccentric structure. It is usually installed inside the casing and is used to automatically correct deviations during tubing installation. It fixes the tubing position through mechanical slips or straightening mechanisms to prevent wear or slippage caused by derrick tilting or the weight of the tubing itself.

[0003] Regarding the aforementioned technologies, the inventors discovered that because oil pipes are prone to deviating from the casing centerline due to their own weight or friction, they are easily prone to uneven wear or blockage. Traditional eccentric hangers do not have a guiding structure, which not only affects the installation efficiency of the overall structure of oil extraction pipelines, but also leads to damage to the oil pipes or failure to accurately sit in the corresponding positions, thus requiring multiple adjustments, thereby increasing operation time and costs. Utility Model Content

[0004] The main technical problem solved by this utility model is to provide an eccentric oil pipe hanger with a guiding structure, which facilitates quick connection and installation of pipelines, improves installation efficiency, and reduces the occurrence of uneven wear or blockage.

[0005] To solve the above-mentioned technical problems, the present invention provides an eccentric oil pipe hanger with a guiding structure, comprising: an upper gauge pipe and a lower gauge pipe, the upper gauge pipe and the lower gauge pipe being connected by bolts, an annular connecting seat being connected to the top of the inner cavity of the lower gauge pipe, an eccentric cylinder with a conical bottom being connected to the top of the annular connecting seat, a limiting clamping component with a guiding function being provided at the top of the annular connecting seat and on the outer circle of the eccentric cylinder, and a plurality of threaded set screws being provided on the outer side of the lower gauge pipe, one end of the set screws being in contact with the surface of the limiting clamping component;

[0006] The top of the eccentric cylinder is provided with a tapered surface, and it also includes a drive assembly connected to the upper gauge tube to drive the eccentric cylinder to move downward.

[0007] By adopting the above technical solution, the bottom of the eccentric cylinder is conical, which offsets the tubing axis from the casing centerline, adapting to the string separation requirements of multi-branch wells or horizontal wells. Furthermore, the conical surface cooperation disperses axial and radial loads, improving the space utilization of complex well types and avoiding uneven wear caused by contact between the tubing and the inner wall of the casing. At the same time, the drive assembly drives the eccentric cylinder to move downward, closely fitting the inner side of the limiting clamping assembly and limiting the movement range of the eccentric cylinder, ensuring accurate placement of the tubing string. Meanwhile, the top screw abuts against the surface of the limiting clamping assembly, fixing the tubing position and preventing displacement caused by well pressure fluctuations or mechanical vibrations.

[0008] In a preferred embodiment, the present invention can be further configured as follows: the limiting and clamping assembly includes a plurality of conical limiting guide plates that match the bottom end of the eccentric cylinder. The inner sides of the conical limiting guide plates are in close contact with the bottom end of the eccentric cylinder. One end of the set screw is in contact with the corresponding conical limiting guide plate. Two receiving grooves I are provided at intervals on the outer sides of the conical limiting guide plates. Two receiving grooves II are provided on the inner sides of the conical limiting guide plates. The top receiving groove I is located between the receiving grooves II. A sealing ring I is embedded in the top receiving groove I. At least one steel ring is provided in the bottom receiving groove I. Sealing rings II are embedded in the receiving grooves II.

[0009] By adopting the above technical solution, the conical contact surface fits tightly with the bottom of the eccentric cylinder. The geometric shape of the conical surface restricts the direction of oil pipe offset, ensuring that the oil pipe is lowered along the preset trajectory, improving installation efficiency. In addition, multiple conical guide plates disperse the radial load, avoiding local stress concentration. At the same time, the conical guide plates allow the oil pipe to deviate slightly, and the stability is maintained by fine adjustment with set screws, reducing the risk of seal failure or oil pipe damage caused by uneven wear.

[0010] In a preferred embodiment, the present invention can be further configured as follows: the driving assembly includes a plurality of inclined driving rods threaded to the bottom end of the upper tube, one end of each driving rod is connected to a driving handle, and after the eccentric cylinder moves downward, one end of each driving rod and the driving handle is always in contact with the conical surface of the eccentric cylinder and located between the upper and lower circles of the conical surface.

[0011] By adopting the above technical solution, the axial force applied by the drive rod is transmitted to the eccentric cylinder, pushing it to move axially. This avoids the problem of eccentric cylinder tilting or jamming caused by uneven force transmission. By the end of the drive rod contacting the conical surface of the eccentric cylinder, the geometric self-locking effect of the conical surface of the eccentric cylinder restricts the direction of oil pipe offset. The drive rod is located between the upper and lower circles of the conical surface. Through mechanical limiting, the sealing failure and mechanical jamming problems caused by off-center load in traditional drive systems are solved, significantly improving operational safety and efficiency.

[0012] In a preferred embodiment, the present invention can be further configured such that the top of the eccentric cylinder is located above the top of the lower gauge tube, and the top of the limiting and clamping assembly is located below the bottom of the conical surface.

[0013] By adopting the above technical solution, the top of the eccentric cylinder is located above the top of the lower gauge tube. This design ensures that the eccentric cylinder has enough space to move up and down, while facilitating connection and disconnection with the tubing string.

[0014] In a preferred embodiment, the present invention can be further configured such that: a sealing ring 3 is embedded at the top of the eccentric cylinder between the top of the limiting clamping assembly and the bottom of the conical surface.

[0015] By adopting the above technical solution, the sealing ring three is located at a key position between the eccentric cylinder, the limiting clamping assembly and the conical surface, forming an additional sealing layer, which further enhances the sealing performance of the hanger. When the eccentric cylinder moves up and down or is connected to the oil pipe string, the sealing ring three can effectively prevent oil from leaking from the tiny gap between the eccentric cylinder and the lower gauge pipe or the limiting clamping assembly.

[0016] In summary, the present invention includes at least one of the following beneficial technical effects of an eccentric oil pipe hanger with a guiding structure:

[0017] 1. By using a tapered limiting guide plate, the tapered surface of the guide plate can distribute axial and radial loads, improve the space utilization of complex well types, and avoid uneven wear caused by contact between the tubing and the inner wall of the casing. At the same time, the drive assembly drives the eccentric cylinder to move downward, which fits tightly against the inner side of the limiting clamping assembly and limits the movement range of the eccentric cylinder, ensuring the accurate placement of the tubing string, thereby improving the installation efficiency of the oil production system.

[0018] 2. The conical limiting guide plate not only serves as a guide but also limits the movement range of the eccentric cylinder through close contact, preventing loosening or damage to the connection due to shaking or tilting. Furthermore, the steel ring further enhances the structural strength of the conical limiting guide plate, enabling it to withstand greater pressure and vibration. Simultaneously, the axial force applied by the drive rod is transmitted to the eccentric cylinder, pushing it to move axially. The end of the drive rod abuts against the conical surface of the eccentric cylinder. Through mechanical limiting, the sealing failure and mechanical jamming problems caused by off-center loading in traditional drive systems are solved, significantly improving operational safety and efficiency. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0020] Figure 1 This is a schematic diagram of the structure of this utility model;

[0021] Figure 2 for Figure 1 A partial sectional view;

[0022] Figure 3 This is a schematic diagram of the limiting and clamping assembly of this utility model.

[0023] In the diagram: 1. Upper gauge tube; 2. Lower gauge tube; 3. Annular connecting seat; 4. Eccentric cylinder; 50. Limiting and clamping assembly; 6. Set screw; 7. Conical surface; 80. Drive assembly; 9. Sealing ring three;

[0024] 51. Conical limiting guide plate; 52. Receiving groove one; 53. Receiving groove two; 54. Sealing ring one; 55. Steel ring; 56. Sealing ring two;

[0025] 81. Drive lever; 82. Drive handle. Detailed Implementation

[0026] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0027] It should be noted that these figures are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0028] Reference Figure 1-3This utility model discloses an eccentric oil pipe hanger with a guiding structure, comprising: an upper gauge pipe 1 and a lower gauge pipe 2, which are connected by bolts. An annular connecting seat 3 is connected to the top of the inner cavity of the lower gauge pipe 2. An eccentric cylinder 4 with a conical bottom is connected to the top of the annular connecting seat 3. A limiting and clamping assembly 50 with a guiding function is provided at the top of the annular connecting seat 3 and on the outer circumference of the eccentric cylinder 4. Several threaded set screws 6 are provided on the outer side of the lower gauge pipe 2, with one end of each set screw abutting against the surface of the limiting and clamping assembly 50. The top of the eccentric cylinder 4 is located above the top of the lower gauge pipe 2, and the top of the limiting and clamping assembly 50 is located below the bottom of the conical surface 7. The limiting and clamping assembly 50 includes several conical limiting guide plates 51 that match the bottom end of the eccentric cylinder 4. The inner side of the guide plate 51 is in close contact with the bottom end of the eccentric cylinder 4. One end of the set screw 6 is in contact with the corresponding conical limiting guide plate 51. The top of the eccentric cylinder 4 is fitted with a sealing ring 9 located between the top of the limiting clamping assembly 50 and the bottom of the conical surface 7. Two receiving grooves 52 are opened at intervals on the outer side of the conical limiting guide plate 51. Two receiving grooves 53 are opened on the inner side of the conical limiting guide plate 51. The top receiving groove 52 is located between the receiving grooves 53. A sealing ring 54 is embedded in the top receiving groove 52. At least one steel ring 55 is provided in the bottom receiving groove 52. A sealing ring 56 is embedded in each of the receiving grooves 53. The top of the eccentric cylinder 4 is provided with a conical surface 7. The eccentric cylinder 4 also includes a driving assembly 80 connected to the upper gauge tube 1 to drive the eccentric cylinder 4 to move downward.

[0029] The lower tube 2 and the annular connecting seat 3 are integrally formed. The sealing ring 56 is preferably made of EPDM material. The inner side of the conical limiting guide plate 51 is in close contact with the bottom end of the eccentric cylinder 4, and the outer side is subjected to radial pressure through the set screw 6, forming a double conical guide structure. This ensures that the eccentric cylinder 4 remains stably centered. At the same time, when the eccentric cylinder 4 is pushed downward by the drive assembly 80, the sealing ring 56 in the receiving groove 53 of the conical limiting guide plate 51 provides elastic damping, which can absorb vibration energy and improve the sealing effect. In addition, the number of conical limiting guide plates 51 is matched with the number of set screws 6, and preferably not less than 6. The synergistic effect of the drive assembly 80 ensures accurate installation of the tubing and wellbore, accurate placement of the tubing string, and limits the movement range of the eccentric cylinder 4, thereby improving the installation efficiency of the oil production system. In addition, the sealing ring 1 54 is preferably made of NBR material, which forms a contact seal with the bottom end of the eccentric cylinder 4 through the pre-tightening force of the top screw 6, and forms a multi-seal knot with the sealing ring 2 56 and the steel ring 55. Meanwhile, the sealing ring 3 9 is preferably made of FKM fluororubber, which is located between the top of the limiting clamping assembly 50 and the bottom of the conical surface 7. It can compensate for the wear of the conical surface 7 by elastic deformation and further improve the sealing function.

[0030] The drive assembly 80 includes several drive rods 81 that are inclined and threaded to the bottom of the upper tube 1. One end of each drive rod 81 is connected to a drive handle 82. After the eccentric cylinder 4 moves downward, the drive rods 81 and the drive handles 82 are always in contact with the conical surface 7 of the eccentric cylinder 4 and are located between the upper and lower circles of the conical surface 7.

[0031] The inclined surface at the bottom of the drive rod 81 is parallel to the surface of the conical surface 7. After the eccentric cylinder 4 is accurately placed inside the lower gauge tube 2, the drive rod 81 rotates, and its bottom contacts the conical surface 7 of the eccentric cylinder 4, guiding the eccentric cylinder 4 to move precisely along the axial direction, so that it is installed accurately. Furthermore, the radial offset of the eccentric cylinder 4 is limited by the geometric constraint of the conical surface 7.

[0032] The implementation principle of this embodiment is as follows: During use, the eccentric cylinder 4 is installed inside the lower tube 2 and on the top of the annular connecting seat 3 using a crane or other special tools. Under the action of the bottom end of the eccentric cylinder 4 and the inner cone of the conical limiting guide plate 51, a double conical guide structure is formed, keeping the eccentric cylinder 4 vertically centered. Then, the operator rotates the drive handle 82 to drive the drive rod 81 to rotate, causing the drive rod 81 to move downward until the end of the drive rod 81 contacts the conical surface 7 of the eccentric cylinder 4. At this time, the drive rod 81 applies pressure to the eccentric cylinder 4, keeping it centered and downward. Then, the set screw 6 is tightened in sequence, and the radial pressure is applied to the eccentric cylinder 4 through the conical limiting guide plate 51 to stabilize it, thereby improving the installation efficiency and installation stability.

[0033] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made using the content of this utility model specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. An eccentric tubing hanger with a guiding structure, comprising: The upper gauge tube (1) and the lower gauge tube (2) are connected by bolts. The lower gauge tube (2) has an annular connecting seat (3) at the top of its inner cavity. An eccentric cylinder (4) with a tapered bottom is connected to the top of the annular connecting seat (3). A limiting clamping assembly (50) with a guiding function is provided on the top of the annular connecting seat (3) and on the outer circle of the eccentric cylinder (4). Several threaded set screws (6) are provided on the outer side of the lower gauge tube (2). One end of the set screw (6) is in contact with the surface of the limiting clamping assembly (50). The top end of the eccentric cylinder (4) is provided with a tapered surface (7), and it also includes a drive assembly (80) connected to the upper gauge tube (1) to drive the eccentric cylinder (4) to move downward.

2. An eccentric oil pipe hanger with a guiding structure according to claim 1, characterized in that, The limiting clamping assembly (50) includes several conical limiting guide plates (51) that match the bottom end of the eccentric cylinder (4). The inner side of the conical limiting guide plate (51) is in close contact with the bottom end of the eccentric cylinder (4). One end of the set screw (6) is in contact with the corresponding conical limiting guide plate (51). Two receiving grooves (52) are opened at intervals on the outer side of the conical limiting guide plate (51). Two receiving grooves (53) are opened on the inner side of the conical limiting guide plate (51). The top receiving groove (52) is located between the receiving grooves (53). A sealing ring (54) is embedded in the top receiving groove (52). At least one steel ring (55) is provided in the bottom receiving groove (52). A sealing ring (56) is embedded in each of the receiving grooves (53).

3. An eccentric tubing hanger with a guiding structure according to claim 1, characterized in that, The drive assembly (80) includes several drive rods (81) that are inclined and threaded to the bottom of the upper tube (1). One end of each drive rod (81) is connected to a drive handle (82). After the eccentric cylinder (4) moves downward, the drive rod (81) and the drive handle (82) are always in contact with the conical surface (7) of the eccentric cylinder (4) and located between the upper circle and the lower circle of the conical surface (7).

4. An eccentric oil pipe hanger with a guiding structure according to claim 1, characterized in that, The top of the eccentric cylinder (4) is located above the top of the lower gauge tube (2), and the top of the limiting clamping assembly (50) is located below the bottom of the conical surface (7).

5. An eccentric oil pipe hanger with a guiding structure according to claim 1, characterized in that, The top of the eccentric cylinder (4) is fitted with a sealing ring three (9) located between the top of the limiting clamping assembly (50) and the bottom of the conical surface (7).

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