A high-pressure resistant fiber optic logging casing structure

Abstract

This utility model relates to the field of fiber optic cable protection technology, and in particular to a high-pressure resistant fiber optic logging cable structure, comprising an outer metal sleeve, with several rubber support ribs fixedly arranged inside the outer metal sleeve, a filling layer fixedly arranged on one side of each rubber support rib, several cables arranged inside the filling layer, and a reinforcing mechanism at the center of the filling layer. This utility model provides dual protection through the outer metal sleeve and the metal spring coil: the outer metal sleeve, as a robust outer shell, can effectively resist the direct impact of the external high-pressure environment, while the nickel-titanium alloy metal spring coil utilizes its superelastic properties to further absorb and buffer the stress brought by the high pressure; this dual protection mechanism enables the cable protection to maintain structural integrity under extreme high-pressure conditions, preventing damage to the internal cables due to excessive pressure, thereby greatly improving the applicability and reliability of the cable protection in high-pressure logging environments.

Description

Technical Field

[0001] This utility model relates to the field of optical fiber protection technology, specifically a high-pressure resistant optical fiber logging protection structure. Background Technology

[0002] Fiber optic logging technology is an advanced logging method that has emerged in recent years with the development of fiber optic communication and sensor technology. It utilizes optical fiber as the signal transmission medium, and by installing fiber optic sensors downhole, it can acquire downhole geological and engineering parameters in real time and accurately. Compared with traditional cable logging, fiber optic logging has advantages such as large transmission bandwidth, strong resistance to electromagnetic interference, and good corrosion resistance, which can meet the demands of modern oil and gas exploration and development for high-precision and high-efficiency logging.

[0003] In oil and gas exploration and development, logging operations are typically conducted in complex downhole environments. These environments are characterized by high pressure, high temperature, high corrosiveness, and strong vibrations, which place extremely demanding requirements on the performance of logging equipment.

[0004] During deep well logging, downhole pressure can reach hundreds of megapascals. Logging equipment must be able to withstand such high pressure, otherwise it may cause equipment damage or signal transmission interruption.

[0005] During well logging, logging equipment may be subjected to mechanical forces such as collisions with the wellbore, stretching and bending of tools. These vibrations and impacts may cause cable breakage, sensor damage, or signal distortion.

[0006] Therefore, a high-pressure resistant fiber optic logging casing structure is needed to improve the above problems. Utility Model Content

[0007] The purpose of this invention is to provide a high-pressure resistant fiber optic logging casing structure to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, this utility model provides the following technical solution:

[0009] A high-pressure resistant fiber optic logging casing structure includes an outer metal sleeve, a plurality of rubber support ribs fixedly disposed on the inner side of the outer metal sleeve, a filling layer fixedly disposed on one side of the rubber support ribs, a plurality of cables disposed on the inner side of the filling layer, and a reinforcing mechanism disposed at the center of the filling layer.

[0010] As a preferred embodiment of this utility model, a plurality of metal spring rings are fixedly provided between the outer metal sleeve and the filling layer, and the metal spring rings are made of nickel-titanium alloy.

[0011] As a preferred embodiment of this utility model, the filling layer is a protective layer consisting of an outer rubber layer and an inner polyethylene filling layer.

[0012] As a preferred embodiment of this utility model, the reinforcing mechanism includes a reinforcing metal cable, anti-slip ridges, and reinforcing ribs.

[0013] As a preferred embodiment of this utility model, the surface of the reinforced metal cable is fixedly provided with a number of reinforcing ribs, and the surface of the reinforcing ribs is fixedly provided with a number of anti-slip protrusions.

[0014] As a preferred embodiment of this utility model, the anti-slip protrusions and reinforcing ribs are disposed inside the filling layer.

[0015] As a preferred embodiment of this utility model, a metal braided mesh is fixedly provided on the surface of the cable inside the filling layer.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] 1. The dual protection of the outer metal sleeve and the metal spring ring of this utility model: The outer metal sleeve, as a sturdy outer shell, can effectively resist the direct impact of the external high pressure environment, while the metal spring ring made of nickel-titanium alloy utilizes its superelastic properties to further absorb and buffer the stress brought by the high pressure; This dual protection mechanism enables the casing to maintain structural integrity under extreme high pressure conditions and prevents the internal cables from being damaged due to excessive pressure, thereby greatly improving the applicability and reliability of the casing in high-pressure logging environments.

[0018] 2. The rubber layer and polyethylene filler of the filling layer of this utility model can further disperse and absorb pressure, forming a buffer area. This design not only reduces the direct effect of pressure on the cable, but also avoids local stress concentration, ensuring that the protective tube can operate stably for a long time under high pressure environment and extending the service life of the protective tube.

[0019] 3. The elastic properties of the rubber support ribs combined with the superelasticity of the metal spring coils in this utility model form a highly efficient shock absorption system. During well logging, the equipment may be subjected to impacts and vibrations from the well wall or other objects. This structure can effectively absorb and attenuate vibration energy, reduce the impact of vibration on internal cables and reinforcing mechanisms, ensure the stability of cables in complex environments, and avoid signal transmission interruption or distortion. The rubber layer of the filling layer can generate a certain damping effect during vibration, further reducing the amplitude and frequency of vibration. This design allows the casing to better protect the internal structure when facing frequent vibrations and impacts, reducing the risk of failure due to mechanical damage. Attached Figure Description

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

[0021] Figure 2 This is a schematic diagram of the overall cross-sectional three-dimensional structure of this utility model;

[0022] Figure 3 This is a schematic diagram of the overall cross-sectional structure of this utility model;

[0023] Figure 4 This is a schematic diagram of the reinforcing mechanism structure of this utility model;

[0024] Figure 5 This is a cross-sectional front view of the present invention;

[0025] Figure 6 This is a cross-sectional side view of the present invention.

[0026] Figure 7 This is a front structural diagram of the reinforcing mechanism of this utility model.

[0027] In the diagram: 1. Outer metal sleeve; 2. Rubber support rib; 3. Filling layer; 4. Metal spring coil; 5. Reinforcing mechanism; 6. Cable; 7. Metal braided mesh; 8. Reinforcing metal rope; 9. Anti-slip ridge; 10. Reinforcing rib. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0029] To facilitate understanding of this utility model, a more comprehensive description of it will be provided below with reference to relevant embodiments. Several embodiments of this utility model are given. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this utility model will be more thorough and complete.

[0030] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0032] Please see Figure 1-7 This utility model provides a technical solution: a high-pressure resistant fiber optic logging casing structure, including an outer metal sleeve 1, a plurality of rubber support ribs 2 fixedly arranged inside the outer metal sleeve 1, a filling layer 3 fixedly arranged on one side of the rubber support ribs 2, a plurality of cables 6 arranged inside the filling layer 3, and a reinforcing mechanism 5 arranged in the center of the filling layer 3. The outer metal sleeve 1 plays a key physical protection role; under high pressure environment, it can withstand external pressure impact and prevent external objects from causing direct damage to the internal structure; at the same time, it also provides a stable outer shell frame for the entire casing structure, ensuring that the overall shape and structure of the casing remain stable in complex logging environments;

[0033] The rubber support rib 2 is fixed inside the outer metal sleeve 1. Its elastic properties allow it to deform to a certain extent when subjected to external force, thereby buffering the impact of external pressure on the internal structure. It can evenly distribute the pressure borne by the outer metal sleeve 1 onto the filling layer 3, avoiding damage to key components such as internal cables 6 caused by excessive local pressure. In addition, the rubber support rib 2 can also play a certain role in shock absorption, reducing the impact force on the internal structure caused by equipment movement or environmental vibration during well logging.

[0034] The outer layer of the filling layer 3 is a rubber layer, and the inner layer is filled with polyethylene. The rubber layer has good elasticity and sealing properties, which can further buffer external pressure and vibration, while preventing liquids or other substances from seeping into the inner tube. The polyethylene filler can increase the volume and stability of the filling layer 3, so that the filling layer 3 can better support the internal cable 6 and the reinforcing mechanism 5, ensuring that they are in a relatively stable position inside the inner tube, and preventing the cable 6 from being damaged by displacement or collision under high pressure or vibration.

[0035] As an example of this utility model, a plurality of metal spring coils 4 are fixedly provided between the outer metal sleeve 1 and the filling layer 3. The metal spring coils 4 are made of nickel-titanium alloy. The nickel-titanium alloy has excellent superelastic properties, which can produce significant elastic deformation when subjected to large pressure, and can quickly return to its original shape after the pressure is released. When the casing is in a high-pressure environment, the metal spring coils 4 can effectively absorb and buffer the external pressure, converting it into its own elastic deformation energy, thereby reducing the impact of pressure on the filling layer 3 and internal cable 6 and other structures. At the same time, when vibration is encountered during logging, the metal spring coils 4 can also play a good role in shock absorption, reducing the transmission of vibration energy and protecting the internal structure from vibration damage.

[0036] The rubber support rib 2 and the rubber layer of the filling layer 3 together form a multi-layered buffer system. The rubber support rib 2 first transmits the pressure of the outer metal sleeve 1 to the filling layer 3, and the rubber layer of the filling layer 3 further disperses and absorbs these pressures. This synergistic effect enables the protective tube to better protect the internal structure under high pressure and vibration, ensuring the normal operation of components such as cable 6.

[0037] As an example of this utility model, the filling layer 3 is a protective layer with an outer rubber layer and an inner polyethylene filling. The cable 6 is disposed inside the filling layer 3. The rubber layer and polyethylene filling material of the filling layer 3 can provide a relatively soft and stable wrapping environment for the cable 6, preventing the cable 6 from directly contacting hard parts such as the outer metal sleeve 1 and being worn.

[0038] As an example of this utility model, the reinforcing mechanism 5 includes a reinforcing metal cable 8, an anti-slip ridge 9, and a reinforcing rib 10. The reinforcing metal cable 8 can provide additional tensile strength for the casing, preventing the casing from deforming or being damaged due to tension during logging. The reinforcing rib 10 is fixed to the surface of the reinforcing metal cable 8, further enhancing the structural strength of the reinforcing metal cable 8, enabling it to better withstand various external forces. The anti-slip ridge 9 is provided on the surface of the reinforcing rib 10, which can increase the friction between the reinforcing mechanism 5 and the filling layer 3, preventing the reinforcing mechanism 5 from sliding or displacing inside the filling layer 3, thereby ensuring that the reinforcing mechanism 5 can stably perform its reinforcing function and provide more reliable protection for the cable 6.

[0039] As an example of this utility model, a plurality of reinforcing ribs 10 are fixedly provided on the surface of the reinforcing metal cable 8, and a plurality of anti-slip protrusions 9 are fixedly provided on the surface of the reinforcing ribs 10. The anti-slip protrusions 9 and the reinforcing ribs 10 are disposed inside the filling layer 3 and are interlocked with the rubber layer and polyethylene filler of the filling layer 3. This design enables the reinforcing mechanism 5 to form a tight bond with the filling layer 3, enhancing the stability of the entire protective tube structure. The anti-slip protrusions 9 can increase the contact area and friction between the reinforcing mechanism 5 and the filling layer 3, further preventing the reinforcing mechanism 5 from moving relative to the filling layer 3, thereby ensuring that the reinforcing mechanism 5 can function stably and provide reliable protection and support for the cable 6.

[0040] As an example of this utility model, the anti-slip ridge 9 and the reinforcing rib 10 are set inside the filling layer 3. Through the synergistic effect of the rubber support rib 2, the filling layer 3, the metal spring ring 4, and the reinforcing mechanism 5, the entire high-pressure resistant fiber optic logging casing structure forms a multi-layered and multi-dimensional stable system. Under various complex working conditions such as high pressure, vibration, and tension, each part can cooperate and support each other to jointly resist the influence of adverse external factors, ensuring the stability and reliability of the casing structure, thereby providing a strong guarantee for the normal operation of fiber optic logging.

[0041] As an example of this utility model, a metal braided mesh 7 is fixedly provided on the surface of the cable 6 inside the filling layer 3. The metal braided mesh 7 can enhance the mechanical strength of the cable 6 and prevent the cable 6 from breaking or being damaged under high pressure, vibration or tension. The metal braided mesh 7 also has a certain electromagnetic shielding effect, which can reduce the influence of external electromagnetic interference on the signal transmission inside the cable 6 and ensure the accuracy and stability of the logging signal.

[0042] Working principle: During use, the outer metal sleeve 1 plays a key physical protection role; under high pressure environment, it can withstand external pressure impact and prevent external objects from causing direct damage to the internal structure; at the same time, it also provides a stable outer shell frame for the entire casing structure, ensuring that the overall shape and structure of the casing remain stable in complex logging environment.

[0043] The rubber support rib 2 is fixed inside the outer metal sleeve 1. Its elastic properties allow it to deform to a certain extent when subjected to external force, thereby buffering the impact of external pressure on the internal structure. It can evenly distribute the pressure borne by the outer metal sleeve 1 onto the filling layer 3, avoiding damage to key components such as internal cables 6 caused by excessive local pressure. In addition, the rubber support rib 2 can also play a certain role in shock absorption, reducing the impact force on the internal structure caused by equipment movement or environmental vibration during well logging.

[0044] The outer layer of the filling layer 3 is a rubber layer, and the inner layer is filled with polyethylene. The rubber layer has good elasticity and sealing properties, which can further buffer external pressure and vibration, while preventing liquids or other substances from seeping into the inner tube. The polyethylene filler can increase the volume and stability of the filling layer 3, so that the filling layer 3 can better support the internal cable 6 and the reinforcing mechanism 5, ensuring that they are in a relatively stable position inside the inner tube, and preventing the cable 6 from being damaged by displacement or collision under high pressure or vibration.

[0045] Several metal spring coils 4 made of nickel-titanium alloy are fixedly installed between the outer metal sleeve 1 and the filling layer 3. Nickel-titanium alloy has excellent superelastic properties, which can produce significant elastic deformation when subjected to large pressure, and can quickly return to its original shape after the pressure is released. When the casing is in a high-pressure environment, the metal spring coils 4 can effectively absorb and buffer the external pressure, converting it into its own elastic deformation energy, thereby reducing the impact of pressure on the filling layer 3 and internal cable 6 and other structures. At the same time, when vibration is encountered during logging, the metal spring coils 4 can also play a good role in shock absorption, reducing the transmission of vibration energy and protecting the internal structure from vibration damage.

[0046] The rubber support rib 2 and the rubber layer of the filling layer 3 together form a multi-layered buffer system; the rubber support rib 2 first transmits the pressure of the outer metal sleeve 1 to the filling layer 3, and the rubber layer of the filling layer 3 further disperses and absorbs these pressures; this synergistic effect enables the protective tube to better protect the internal structure under high pressure and vibration environment, and ensure the normal operation of components such as cable 6.

[0047] Cable 6 is placed inside the filling layer 3. The rubber layer and polyethylene filler of the filling layer 3 provide a relatively soft and stable wrapping environment for cable 6, preventing cable 6 from directly contacting hard components such as the outer metal sleeve 1 and being worn. At the same time, a metal braided mesh 7 is fixedly installed on the surface of cable 6 inside the filling layer 3. The metal braided mesh 7 can enhance the mechanical strength of cable 6 and prevent cable 6 from breaking or being damaged under high pressure, vibration or tension. In addition, the metal braided mesh 7 also has a certain electromagnetic shielding effect, which can reduce the impact of external electromagnetic interference on the signal transmission inside cable 6 and ensure the accuracy and stability of logging signals.

[0048] The reinforcing mechanism 5 includes a reinforcing metal cable 8, anti-slip ridges 9, and reinforcing ribs 10. The reinforcing metal cable 8 provides additional tensile strength to the casing, preventing deformation or damage to the casing during logging due to tension. The reinforcing ribs 10 are fixed to the surface of the reinforcing metal cable 8, further enhancing the structural strength of the reinforcing metal cable 8 and enabling it to better withstand various external forces. The anti-slip ridges 9 are located on the surface of the reinforcing ribs 10, increasing the friction between the reinforcing mechanism 5 and the filling layer 3, preventing the reinforcing mechanism 5 from sliding or displacing inside the filling layer 3, thereby ensuring that the reinforcing mechanism 5 can stably perform its reinforcing function and provide more reliable protection for the cable 6.

[0049] Anti-slip ridges 9 and reinforcing ribs 10 are set inside the filling layer 3 and interlock with the rubber layer and polyethylene filler of the filling layer 3. This design creates a tight bond between the reinforcing mechanism 5 and the filling layer 3, enhancing the stability of the entire protective tube structure. The anti-slip ridges 9 increase the contact area and friction between the reinforcing mechanism 5 and the filling layer 3, further preventing relative movement of the reinforcing mechanism 5 inside the filling layer 3, thereby ensuring that the reinforcing mechanism 5 can function stably and provide reliable protection and support for the cable 6.

[0050] Through the coordinated action of various components such as rubber support ribs 2, filling layer 3, metal spring coils 4, and reinforcing mechanism 5, the entire high-pressure resistant fiber optic logging casing structure forms a multi-layered and multi-dimensional stable system. Under various complex working conditions such as high pressure, vibration, and tension, each component can cooperate and support each other to jointly resist the influence of adverse external factors, ensuring the stability and reliability of the casing structure, thereby providing a strong guarantee for the normal operation of fiber optic logging.

[0051] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-pressure resistant fiber optic logging casing structure, comprising an outer metal sleeve (1), characterized in that: The outer metal sleeve (1) is fixed with several rubber support ribs (2) on the inner side, and a filling layer (3) is fixed on one side of the rubber support ribs (2). Several cables (6) are provided on the inner side of the filling layer (3), and a reinforcing mechanism (5) is provided in the center of the filling layer (3).

2. The high-pressure resistant fiber optic logging casing structure according to claim 1, characterized in that: Several metal spring rings (4) are fixed between the outer metal sleeve (1) and the filling layer (3), and the metal spring rings (4) are made of nickel-titanium alloy.

3. The high-pressure resistant fiber optic logging casing structure according to claim 2, characterized in that: The filling layer (3) is a protective layer with an outer rubber layer and an inner polyethylene filling layer.

4. The high-pressure resistant fiber optic logging casing structure according to claim 3, characterized in that: The reinforcing mechanism (5) includes a reinforcing metal cable (8), anti-slip ridges (9), and reinforcing ribs (10).

5. The high-pressure resistant fiber optic logging casing structure according to claim 4, characterized in that: The surface of the reinforced metal cable (8) is fixedly provided with several reinforcing ribs (10), and the surface of the reinforcing ribs (10) is fixedly provided with several anti-slip protrusions (9).

6. The high-pressure resistant fiber optic logging casing structure according to claim 5, characterized in that: The anti-slip protrusions (9) and reinforcing ribs (10) are disposed inside the filling layer (3).

7. The high-pressure resistant fiber optic logging casing structure according to claim 6, characterized in that: The surface of the cable (6) inside the filling layer (3) is fixedly provided with a metal braided mesh (7).

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