Petroleum drilling telescopic compensator

Abstract

The expansion compensator comprises a main body assembly, the main body assembly comprises an outer cylinder and an inner cylinder, one end of the outer cylinder is connected to the outer side of one end of the inner cylinder in a sleeved mode, and meanwhile guide blocks symmetrically arranged on the outer side of the inner cylinder are in sliding connection with guide sliding grooves symmetrically formed in one side of the interior of the outer cylinder; a limiting baffle ring is arranged at the end, located outside the inner cylinder, of the outer cylinder, a high-temperature alloy corrugated pipe is fixedly connected to the end, located inside the outer cylinder, of the inner cylinder through mounting screws, and a first sealing assembly and a second sealing assembly are arranged between the outer side of the end, close to the high-temperature alloy corrugated pipe, of the inner cylinder and the outer cylinder. According to the expansion compensator for petroleum drilling, through sliding fit of the inner pipe and the outer pipe, displacement compensation of the high-temperature alloy corrugated pipe and matched use of the multiple sealing assemblies, the expansion problem caused by temperature and pressure changes of a drilling pipe column is solved, and the expansion compensator has the advantages of being large in compensation range, reliable in sealing, resistant to high pressure and high temperature and the like; the device is suitable for complex working conditions such as deep wells and ultra-deep wells.

Description

Technical Field

[0001] This utility model relates to the technical field of expansion joints, specifically an expansion joint for oil drilling. Background Technology

[0002] Expansion joints are mainly used in oil, gas and geological drilling operations to compensate for axial thermal deformation of drilling tools, reduce the impact of equipment vibration on drilling tools, mitigate the deformation of the drill string caused by earthquakes and ground subsidence, and ensure the safe operation of drilling tools.

[0003] Existing expansion joints mostly use a single spring or bellows structure, which has defects such as insufficient compensation, poor high pressure resistance, and low sealing reliability. They are difficult to adapt to the complex working conditions of deep and ultra-deep wells. To address these issues, existing equipment needs to be improved. Utility Model Content

[0004] The purpose of this utility model is to provide an oil drilling expansion compensator to solve the problems mentioned in the background art, which are that existing expansion compensators mostly adopt a single spring or bellows structure, which have defects such as insufficient compensation, poor high pressure resistance, and low sealing reliability, making them difficult to adapt to the complex working conditions of deep wells and ultra-deep wells.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an oil drilling expansion joint, comprising a main body assembly.

[0006] The main component includes an outer cylinder and an inner cylinder, with one end of the outer cylinder sleeved on the outside of one end of the inner cylinder. Simultaneously, symmetrically arranged guide blocks on the outside of the inner cylinder are slidably connected to symmetrically opened guide grooves on one side of the inner cylinder. A limiting ring is provided at the outer end of the inner cylinder located outside the inner cylinder, and the limiting ring is connected to the outer cylinder by fixing screws. A limiting block is provided on one side of the limiting ring at a position corresponding to the guide groove. An elastic element is provided between the limiting block and the corresponding guide block. A high-temperature alloy corrugated pipe is fixedly connected to the inner cylinder at the end inside the outer cylinder by mounting screws, and the other end of the high-temperature alloy corrugated pipe is connected to one end of a positioning tube by mounting screws. The positioning tube is located on the other side inside the outer cylinder. A first sealing component and a second sealing component are provided between the outer cylinder and the end of the inner cylinder near the high-temperature alloy corrugated pipe.

[0007] Preferably, the outer cylinder and the inner cylinder are made of high-strength corrosion-resistant alloy, and the surfaces of the outer cylinder and the inner cylinder are coated with tungsten carbide alloy coating.

[0008] Preferably, an installation groove is provided on the outer side of the outer cylinder at one end of the positioning tube, and a pressure relief valve is provided inside the installation groove. The pressure relief valve is detachably connected to the corresponding pressure relief hole on the positioning tube through the pressure relief pipe through the outer cylinder. A pressure relief head is provided at the other end of the pressure relief valve, and a dustproof mesh plate is provided in the middle of the inner side of the pressure relief head.

[0009] Preferably, the first sealing assembly includes a rubber ring, a metal ring, and an anti-slip layer. A groove is provided in the middle of the inner side of the rubber ring, and a metal ring is provided inside the groove. An anti-slip layer is provided in the middle of the inner side of the rubber ring, and the anti-slip layer is connected to the outer wall of the inner cylinder.

[0010] Preferably, the outer side of the second sealing component is made of perfluoroether rubber material, and the second sealing component has a built-in spring expansion ring.

[0011] Preferably, a third sealing component is provided on the outer side of the positioning tube near the high-temperature alloy bellows, and the outer side of the third sealing component is in contact with the inner wall of the outer cylinder. At the same time, the third sealing component and the second sealing component have the same structure. The other end of the positioning tube passes through the outer cylinder and is threadedly connected to the limiting flange, and one side of the limiting flange is in contact with one end of the outer cylinder. At the same time, the outer diameter of the limiting flange is the same as the outer diameter of the corresponding end of the outer cylinder.

[0012] Compared with the prior art, the beneficial effects of this utility model are: this oil drilling expansion joint,

[0013] To address the shortcomings of existing expansion joints, which mostly employ a single spring or bellows structure, resulting in insufficient compensation, poor high-pressure resistance, and low sealing reliability, making them unsuitable for the complex working conditions of deep and ultra-deep wells, this application solves the problem of expansion and contraction of drilling strings caused by temperature and pressure changes by using sliding fit between the inner and outer pipes, high-temperature alloy bellows for displacement compensation, and multiple sealing components in combination. It boasts advantages such as a large compensation range, reliable sealing, and resistance to high pressure and high temperature, making it suitable for complex working conditions in deep and ultra-deep wells. Attached Figure Description

[0014] Figure 1 This is a frontal cross-sectional view of the present invention.

[0015] Figure 2 This utility model Figure 1 Enlarged structural diagram at point A in the middle;

[0016] Figure 3 This utility model Figure 1 Enlarged structural diagram at point B;

[0017] Figure 4 This is a front view structural diagram of the present invention;

[0018] Figure 5 This is a side view sectional structural diagram of the first sealing component of this utility model.

[0019] In the diagram: 1. Outer cylinder; 101. Guide groove; 102. Mounting groove; 2. Inner cylinder; 201. Guide block; 3. Limiting ring; 301. Limiting block; 4. Elastic element; 5. High-temperature alloy bellows; 6. Mounting screw; 7. First sealing assembly; 701. Rubber ring; 702. Metal ring; 703. Anti-slip layer; 8. Second sealing assembly; 9. Positioning tube; 901. Pressure relief hole; 10. Third sealing assembly; 11. Limiting flange; 12. Pressure relief valve; 13. Pressure relief pipe; 14. Pressure relief head; 15. Dustproof mesh plate. Detailed Implementation

[0020] 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.

[0021] Please see Figure 1-5 This utility model provides a technical solution: an expansion joint for oil drilling, based on... Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5As shown, the main components include an outer cylinder 1 and an inner cylinder 2, with one end of the outer cylinder 1 sleeved on the outside of one end of the inner cylinder 2. Both the outer cylinder 1 and the inner cylinder 2 are made of high-strength, corrosion-resistant alloy, and their surfaces are coated with a tungsten carbide alloy coating to enhance wear resistance and extend their service life. Simultaneously, symmetrically arranged guide blocks 201 on the outer side of the inner cylinder 2 are slidably connected to symmetrically opened guide grooves 101 on one side of the inner side of the outer cylinder 1. Through the guide blocks 201 and the guide grooves 101, the coaxiality of the inner cylinder 2 during its sliding process inside the outer cylinder 1 is ensured. During operation, there is no deviation. A limiting ring 3 is installed at one end of the outer cylinder 1 located outside the inner cylinder 2, and the limiting ring 3 is connected to the outer cylinder 1 by fixing screws. Simultaneously, a limiting block 301 is installed on one side of the limiting ring 3 at a position corresponding to the guide groove 101. An elastic element 4, a wave spring, is installed between the limiting block 301 and the corresponding guide block 201. The elastic element 4 is used to absorb the expansion and contraction displacement of the inner cylinder 2 and provide a restoring force. Through the limiting ring 3 and the elastic element 4, excessive stretching or compression is prevented, extending the operating time. For extended service life, one end of the inner cylinder 2 located inside the outer cylinder 1 is fixedly connected to a high-temperature alloy bellows 5 by a mounting screw 6, and the other end of the high-temperature alloy bellows 5 is connected to one end of a positioning tube 9 by a mounting screw 6. The high-temperature alloy bellows 5 are evenly distributed along the axial direction to absorb the expansion and contraction displacement of the inner cylinder 2 and provide a restoring force. Meanwhile, the positioning tube 9 is located on the other side inside the outer cylinder 1. A first sealing assembly 7 and a second sealing assembly 8 are provided between the outer side of the inner cylinder 2 near the high-temperature alloy bellows 5 and the outer cylinder 1. The first sealing assembly 7 includes a rubber ring 7. 01. A metal ring 702 and an anti-slip layer 703 are provided. A groove is provided in the middle of the inner side of the rubber ring 701. The metal ring 702 is provided inside the groove. The anti-slip layer 703 is provided in the middle of the inner side of the rubber ring 701. The anti-slip layer 703 is connected to the outer wall of the inner cylinder 2 to improve the sealing effect of the first sealing component 7 during use. The outer side of the second sealing component 8 is made of perfluoroether rubber material. The second sealing component 8 has a built-in spring expansion ring. The second sealing component 8 can adapt to wear compensation and form a double protection of "hard seal + soft seal".

[0022] To further explain, an installation groove 102 is provided on the outer side of the outer cylinder 1 at one end of the positioning tube 9, and a pressure relief valve 12 is provided inside the installation groove 102. At the same time, the pressure relief valve 12 is detachably connected to the corresponding pressure relief hole 901 on the positioning tube 9 through the pressure relief pipe 13 through the outer cylinder 1. A pressure relief head 14 is provided at the other end of the pressure relief valve 12, and a dustproof mesh plate 15 is provided in the middle of the inner side of the pressure relief head 14. The pressure relief valve 12, pressure relief pipe 13, pressure relief hole 901 and pressure relief head 14 are used together to avoid the accumulation of internal pressure affecting the compensation performance.

[0023] To further explain, a third sealing component 10 is provided on the outer side of the positioning tube 9 near the high-temperature alloy bellows 5, and the outer side of the third sealing component 10 is in contact with the inner wall of the outer cylinder 1. At the same time, the third sealing component 10 and the second sealing component 8 have the same structure. The other end of the positioning tube 9 passes through the outer cylinder 1 and is threadedly connected to the limiting flange 11, and one side of the limiting flange 11 is in contact with one end of the outer cylinder 1. At the same time, the outer diameter of the limiting flange 11 is the same as the outer diameter of the corresponding end of the outer cylinder 1. By using the positioning tube 9, the third sealing component 10 and the limiting flange 11 together, one end of the high-temperature alloy bellows 5 is fixed to the inner side of one end of the outer cylinder 1, thereby improving the stability of the high-temperature alloy bellows 5.

[0024] In use, one end of the outer cylinder 1 and the inner cylinder 2 are connected to the wellhead device and the drilling string, respectively. When the drilling string elongates due to temperature rise, the inner cylinder 2 slides inward along the outer cylinder 1, compressing the high-temperature alloy bellows 5 while stretching the elastic element 4. Then, pressure is released through the pressure relief hole 901, pressure relief valve 12, pressure relief pipe 13, and pressure relief head 14 to make the internal and external pressures consistent. When the tubing contracts, the elastic element 4 retracts and resets, pulling the inner cylinder 2 outward, while simultaneously extending the high-temperature alloy bellows 5. The guide block 201 and guide groove 101 work together to ensure smooth sliding. The first sealing component 7, the second sealing component 8, and the third sealing component 10 always maintain contact during displacement, improving the sealing performance.

[0025] The terms “center,” “longitudinal,” “lateral,” “front,” “rear,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” and “outer,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are merely simplified descriptions for the convenience of describing this utility model 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 limiting the scope of protection of this utility model.

[0026] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A petroleum drilling telescopic compensator comprising a main body assembly, characterized in that: the main body assembly comprises an outer cylinder (1) and an inner cylinder (2), and the outer cylinder (1) is sleeved on one end outside of the inner cylinder (2), and the symmetrically arranged guide blocks (201) on the outer side of the inner cylinder (2) are slidably connected with the symmetrically arranged guide grooves (101) on one side inside of the outer cylinder (1), the outer cylinder (1) is provided with a limiting baffle ring (3) on one end outside of the inner cylinder (2), and the limiting baffle ring (3) is connected with the outer cylinder (1) through fixing screws, and a limiting block (301) is arranged on one side of the limiting baffle ring (3) corresponding to the position of the guide groove (101), and an elastic element (4) is arranged between the limiting block (301) and the corresponding guide block (201), the inner cylinder (2) is fixedly connected with a high-temperature alloy bellows (5) on one end inside of the outer cylinder (1) through mounting screws (6), and the other end of the high-temperature alloy bellows (5) is connected with one end of a positioning tube (9) through mounting screws (6), and the other side of the positioning tube (9) is located inside the outer cylinder (1), and a first sealing assembly (7) and a second sealing assembly (8) are arranged between the outer side of the inner cylinder (2) close to one end of the high-temperature alloy bellows (5) and the outer cylinder (1).

2. The petroleum drilling expansion compensator of claim 1, wherein: The outer cylinder (1) and the inner cylinder (2) are made of high-strength corrosion-resistant alloy, and the surfaces of the outer cylinder (1) and the inner cylinder (2) are sprayed with tungsten carbide alloy coating.

3. The petroleum drilling expansion compensator of claim 1, wherein: An installation groove (102) is arranged on the front side of one end of the positioning tube (9) outside of the outer cylinder (1), and a pressure relief valve (12) is arranged inside the installation groove (102), and the pressure relief valve (12) is detachably connected with a pressure relief hole (901) arranged on the positioning tube (9) through a pressure relief tube (13) penetrating the outer cylinder (1), and a pressure relief head (14) is arranged on the other end of the pressure relief valve (12), and a dust screen (15) is arranged in the middle of the inner side of the pressure relief head (14).

4. The petroleum drilling expansion compensator of claim 1, wherein: The first sealing assembly (7) comprises a rubber ring (701), a metal ring (702) and an anti-skid layer (703), a groove is arranged in the middle of the inner side of the rubber ring (701), and the metal ring (702) is arranged inside the groove, the anti-skid layer (703) is arranged in the middle of the inner side of the rubber ring (701), and the anti-skid layer (703) is connected with the outer wall of the inner cylinder (2).

5. The petroleum drilling expansion compensator of claim 1, wherein: The outer side of the second sealing assembly (8) is made of perfluoroether rubber material, and the second sealing assembly (8) is provided with a spring ring inside.

6. The petroleum drilling expansion compensator of claim 1, wherein: A third sealing assembly (10) is arranged on the outer side of one end of the positioning tube (9) close to the high-temperature alloy bellows (5), and the outer side of the third sealing assembly (10) is attached to the inner wall of the outer cylinder (1), and the third sealing assembly (10) and the second sealing assembly (8) have the same structure, the other end of the positioning tube (9) penetrates the outer cylinder (1) and is threadedly connected with a limiting flange (11), and one side of the limiting flange (11) is attached to one end of the outer cylinder (1), and the outer diameter of the limiting flange (11) is the same as the outer diameter of one end of the outer cylinder (1).

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