Underground saturated steam quality optical fiber monitoring device

Abstract

The embodiment of the utility model provides an underground saturated steam quality optical fiber monitoring device which comprises a high-temperature-resistant optical fiber conduit used for protecting an internal optical fiber and transmitting a saturated steam signal; the built-in heat insulation layer is mounted on the inner side wall of the high-temperature-resistant optical fiber conduit; the optical fiber bundle is arranged at the central position in the heat insulation layer and extends along the high-temperature-resistant optical fiber conduit to realize signal conduction with external measurement equipment; and the high-temperature pressure-resistant joint is arranged at at least one end of the high-temperature-resistant optical fiber conduit and is fixedly connected with an underground pipeline system. According to the scheme of the embodiment of the invention, the problem of serious signal attenuation caused by the influence of steam on the physical characteristics of the optical fiber in a high-temperature and high-pressure environment can be solved.

Description

Technical Field

[0001] This application relates to the field of fiber optic sensing technology, and particularly to a fiber optic monitoring device for downhole saturated steam quality. Background Art

[0002] The downhole saturated steam quality fiber optic monitoring device is a device used for real-time monitoring of saturated steam quality during the development of oil and gas fields in high-temperature and high-pressure environments. By using fiber optic sensing technology, it can achieve precise measurement of the downhole steam state, providing important data support for optimizing steam injection efficiency and enhancing recovery rate. However, in the actual application process, a significant problem faced by this device is that due to the influence of steam on the physical properties of the optical fiber in the high-temperature and high-pressure downhole environment, this will cause serious attenuation of the monitoring signal, thereby affecting the accuracy and reliability of the data. Summary of the Invention

[0003] In view of this, the embodiments of the present disclosure provide a fiber optic monitoring device for downhole saturated steam quality, which at least partially solves the problems existing in the prior art.

[0004] This application provides a fiber optic monitoring device for downhole saturated steam quality, including:

[0005] A high-temperature resistant fiber optic conduit for protecting the internal optical fiber and conducting saturated steam signals;

[0006] An internal heat insulation layer installed on the inner sidewall of the high-temperature resistant fiber optic conduit;

[0007] An optical fiber bundle placed at the central position inside the heat insulation layer and extending along the high-temperature resistant fiber optic conduit to achieve signal conduction with external measuring devices; and

[0008] A high-temperature and high-pressure resistant joint provided at at least one end of the high-temperature resistant fiber optic conduit and connected and fixed to the downhole pipeline system, where

[0009] The internal heat insulation layer is composed of at least two layers of heat insulation materials compounded together. The outer layer is a metal film with a high reflectivity, and the inner layer is a porous silica gel insulator.

[0010] The high-temperature and high-pressure resistant joint adopts a two-stage locking mechanism and is equipped with an expansion collar for compensating temperature difference stress inside it.

[0011] Preferably, the outer surface of the high-temperature resistant fiber optic conduit is provided with an anti-corrosion coating.

[0012] Preferably, the optical fiber bundle is coated with an anti-refraction protection layer with a high refractive index.

[0013] Preferably, the expansion collar is arranged between two locking links.

[0014] Preferably, nano materials containing microcapsules are added to the internal heat insulation layer.

[0015] Preferably, support pads are provided at the contact part of the optical fiber bundle and the high-temperature and pressure-resistant joint.

[0016] Preferably, a plurality of evenly distributed heat conduction plates are arranged in the middle part of the high-temperature-resistant optical fiber conduit.

[0017] Preferably, a surrounding waterproof shield is additionally provided in the device, and the waterproof shield is used to wrap the heat conduction plates.

[0018] Preferably, the heat conduction rate of the waterproof shield is lower than that of the heat conduction plates.

[0019] The embodiment of the present disclosure provides an optical fiber monitoring device for downhole saturated steam quality, including: a high-temperature-resistant optical fiber conduit for protecting the internal optical fiber and conducting saturated steam signals; an internal heat insulation layer installed on the inner side wall of the high-temperature-resistant optical fiber conduit; an optical fiber bundle placed at the central position inside the heat insulation layer and extending along the high-temperature-resistant optical fiber conduit to achieve signal conduction with an external measuring device; and a high-temperature and pressure-resistant joint provided at at least one end of the high-temperature-resistant optical fiber conduit and connected and fixed to the downhole pipeline system. Through the solution of the embodiment of the present disclosure, the problem of serious signal attenuation caused by the influence of steam on the physical properties of the optical fiber in a high-temperature and high-pressure environment can be solved. Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present disclosure, the drawings required for the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present disclosure, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0021] Figure 1 Schematic structural diagram of the high-temperature-resistant optical fiber conduit of the present utility model;

[0022] Figure 2 Cross-sectional view of the structure of the high-temperature and pressure-resistant joint of the present utility model;

[0023] Figure 3 Schematic structural diagram of the high-temperature and pressure-resistant joint of the present utility model;

[0024] Figure 4 Schematic structural diagram of the monitoring device of the present utility model;

[0025] Figure 5 Schematic structural diagram of the monitoring device of the present utility model.

[0026] In the figure: 1, high-temperature resistant optical fiber conduit; 2, built-in heat insulation layer; 3, optical fiber bundle; 4, high-temperature and pressure-resistant joint; 5, anti-corrosion coating; 6, metal film; 7, porous silica insulator; 8, anti-refraction protective layer; 9, expansion collar; 10, support pad; 11, heat conduction plate; 12, waterproof shield Specific implementation manners

[0027] The embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings.

[0028] The following uses specific specific examples to illustrate the implementation manners of the present disclosure. Those skilled in the art can easily understand other advantages and effects of the present disclosure from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all of the embodiments. The present disclosure can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present disclosure. It should be noted that, without conflict, the following embodiments and the features in the embodiments can be combined with each other. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present disclosure without making creative efforts belong to the scope of protection of the present disclosure.

[0029] It should be noted that the following describes various aspects of the embodiments within the scope of the appended claims. It should be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is illustrative only. Based on the present disclosure, those skilled in the art should understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects described herein can be used to implement the device and / or practice the method. Additionally, this device and / or this method can be implemented using other structures and / or functionality in addition to one or more of the aspects described herein.

[0030] It should also be noted that the diagrams provided in the following embodiments only illustrate the basic concept of the present disclosure schematically. The diagrams only show the components related to the present disclosure and are not drawn according to the number, shape, and size of the components in actual implementation. The type, quantity, and ratio of each component in its actual implementation can be an arbitrary change, and the component layout type may also be more complex.

[0031] In addition, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that the described aspects can be practiced without these specific details.

[0032] As Figure 1As shown in the figure, the downhole saturated steam quality optical fiber monitoring device of the present application includes a high-temperature resistant optical fiber conduit 1, an internal heat insulation layer 2, an optical fiber bundle 3, and a high-temperature and high-pressure resistant joint 4. Among them, the high-temperature resistant optical fiber conduit 1 is used to protect the internal optical fiber and conduct the saturated steam signal in the downhole high-temperature and high-pressure environment. The internal heat insulation layer 2 is installed on the inner side wall of the high-temperature resistant optical fiber conduit 1 to reduce the influence of external high temperature on the optical fiber signal transmission. The optical fiber bundle 3 is located inside the heat insulation layer 2 and at the internal central position of the high-temperature resistant optical fiber conduit 1, and extends along the conduit to realize signal conduction with external measuring equipment. The high-temperature and high-pressure resistant joint 4 is arranged at at least one end of the high-temperature resistant optical fiber conduit 1 and is connected and fixed to the downhole pipeline system to ensure the overall sealing performance and structural strength of the optical fiber monitoring device. These components cooperate with each other, significantly reducing the attenuation of the optical fiber signal under extreme downhole conditions.

[0033] The high-temperature resistant optical fiber conduit 1 is made of materials with excellent heat resistance performance, and can maintain its mechanical properties without deformation in the high-temperature and high-pressure environment, ensuring the stability and durability of the internal structure. For example, it can be made of high-performance ceramic materials, which not only have a very high melting point but also can be used for a long time in a high-temperature environment without aging or chemical changes. The heat insulation layer 2 uses special composite heat insulation materials such as aerogel, etc. These materials can minimize heat conduction, thereby protecting the optical fiber from high-temperature damage. In addition, the heat insulation layer 2 can be closely attached to the inner wall of the conduit 1 through an adhesive to improve the thermal stability of the entire conduit system. The optical fiber bundle 3 selects high-sensitivity optical fibers, and by optimizing the optical fiber design, the optical signal loss is reduced and the signal quality is improved. For example, by controlling the refractive index distribution of the fiber and optimizing the diameter and cladding material of the fiber, the effective propagation length of the optical signal in the fiber is increased.

[0034] The high-temperature and high-pressure resistant joint 4 needs to be made of high-strength materials to adapt to the complex pressure environment downhole. Common high-strength metal alloys such as super stainless steel or other corrosion-resistant and temperature-resistant materials can be used to manufacture this joint. The high-temperature and high-pressure resistant joint 4 is designed as a structure with two parts fitting and connecting, and is tightly combined with both ends of the high-temperature resistant optical fiber conduit 1 through a threaded fixing method to form a seamless butt joint, enhancing the overall anti-leakage performance. At the same time, a temperature-resistant elastic seal can be added inside the joint to prevent gas leakage caused by high pressure differences, further ensuring the reliable operation of the monitoring device under high-pressure working conditions.

[0035] Through the above design methods, the high-temperature and high-pressure resistant joint 4, the high-temperature resistant optical fiber conduit 1 and its internal heat insulation layer 2 construct an effective sealing environment, significantly reducing the adverse effects of extreme downhole conditions on the internal optical fiber signal. This overall design enables the device to accurately and continuously monitor the quality of saturated steam under complex and harsh working conditions, and provides a reliable basis for real-time data analysis.

[0036] Furthermore, as Figure 1As shown in the figure, the downhole saturated steam quality optical fiber monitoring device of the present application resists the erosion of various corrosive liquids in the downhole high-temperature and high-pressure environment by setting the anti-corrosion coating 5 on the outer surface of the high-temperature resistant optical fiber conduit 1, improving the reliability and sealing performance of the device during long-term operation. Specifically, the anti-corrosion coating 5 is composed of materials with high chemical corrosion resistance, maintaining excellent stability and anti-spalling properties in the high-temperature and high-pressure environment, thus effectively ensuring the overall sealing performance of the device and reducing the attenuation problem in signal transmission caused by high temperature and high pressure. This design extends the service life of the high-temperature resistant optical fiber conduit 1, enabling it to maintain high-precision data transmission under harsh conditions.

[0037] For example, in practical applications, the anti-corrosion coating 5 can be evenly coated on the surface of the optical fiber conduit through physical vapor deposition or chemical vapor deposition processes, ensuring a consistent coating thickness and no bubbles, thereby achieving effective protection of the conduit. This not only enhances the ability of the optical fiber conduit to resist external corrosion but also significantly reduces signal attenuation, enabling the downhole saturated steam quality optical fiber monitoring device to have a more stable performance in the complex and variable underground environment.

[0038] In one embodiment, continuing to refer to Figure 1 , the built-in heat insulation layer 2 in the downhole saturated steam quality optical fiber monitoring device of the present application is composed of at least two layers of heat insulation materials compounded together. Among them, the outer layer is composed of a metal film 6 with a high reflectivity, which can effectively reflect the heat in the external environment, reduce the influence of high temperature on the internal structure of the device, and reduce the heat transfer to the inside of the device. The inner layer uses porous silica gel insulator 7 as the heat insulation layer material. Since porous silica gel has good heat insulation performance and a low thermal conductivity, it can block the external high temperature and absorb some heat at the same time. The combination of the two forms an effective heat insulation protection layer. More importantly, this heat insulation combination can also significantly reduce the problem of the decline in data transmission accuracy caused by temperature fluctuations, ensuring that the optical fiber can still transmit stable and accurate signals in a harsh environment.

[0039] For example, during the manufacturing process, porous silica gel with a suitable material thickness and density can be first selected as the internal core material, and on this basis, a metal film 6 with high density and high reflectivity can be deposited by methods such as chemical vapor deposition. Such a design can not only withstand the high-temperature challenge but also improve the overall reliability and service life of the device. In this way, the device can effectively operate even under extreme temperature conditions, ensuring the true accuracy of the measurement results of the downhole saturated steam quality. Specifically, after completing the above composite process, it is also necessary to closely bond the composite material with other structural components of the monitoring device and perform a good sealing treatment to form a complete protection system.

[0040] In one embodiment, the downhole saturated steam quality optical fiber monitoring device of the present application has the following characteristics: the device includes an optical fiber bundle 3, and the outside of the optical fiber bundle 3 is coated with an anti-refraction protection layer 8 with a high refractive index. The purpose of this anti-refraction protection layer 8 is to significantly reduce the optical loss caused by steam molecules penetrating into the optical fiber under downhole high-temperature and high-pressure conditions in the actual use environment, thereby optimizing the overall signal transmission efficiency. Specifically, the anti-refraction protection layer 8 can not only provide effective physical protection for the optical fiber in extreme environments, preventing mechanical damage and physical degradation caused by harsh environments, but also significantly inhibit the interaction between the surrounding environmental medium and the signal light in the optical fiber through selective material properties. This enables the entire optical fiber monitoring system to still achieve reliable data acquisition and transmission functions even under the test of high-temperature and high-pressure environments.

[0041] In one embodiment, in order to effectively achieve this design goal, polyimide can be used as the anti-refraction protection layer 8 on the outer layer of the optical fiber. For example, using deposition technology or special coating processes, a polyimide film with the required high refractive index properties is prepared. Such thin film materials usually have excellent heat resistance, chemical stability, and mechanical strength, and are very suitable for application in such complex oil and gas well conditions, thus ensuring long-term stable data acquisition accuracy. In this way, the signal loss of the optical fiber is greatly reduced, improving the reliability and accuracy of the monitoring results.

[0042] In one embodiment, as Figure 2 shown, the high-temperature and high-pressure resistant joint 4 of the downhole saturated steam quality optical fiber monitoring device of the present application adopts a two-stage locking mechanism. Through this locking mechanism, the high-temperature and high-pressure resistant joint 4 can maintain a high level of sealing performance and mechanical strength under extreme working conditions, including high-pressure and severe temperature change environments. In addition, an expansion collar 9 is integrated inside the high-temperature and high-pressure resistant joint 4. The expansion collar 9 acts as a temperature compensation component, which can respond to changes in the external environmental temperature, actively deform to adapt to the expansion or contraction caused by temperature, so as to ensure reliable connection and tight packaging between the optical fiber sensor and the external conduit within the entire operating range.

[0043] For example, to achieve this effect, the high-temperature and high-pressure resistant joint 4 may be made of high-alloy metal and use materials such as stainless steel or other materials with good heat resistance and compressive capacity. Through precision machining and special treatment, a strong basic framework is formed. The double-stage locking mechanism is achieved by setting two independent but coordinated locking devices at the joint docking part. These two locking links respectively provide the primary locking force and additional safety guarantee force, enabling the entire joint to effectively resist external force interference even in extremely harsh conditions and preventing any situation that may damage its integrity. As for the internal expansion collar 9, it may be made of an alloy material with good expansion ability and memory properties, such as nitinol, which can automatically adjust its shape in different temperature ranges, relieve the stress accumulation caused by temperature difference, and maintain the lasting and stable contact quality between the components inside the joint. More specifically, the expansion collar 9 can be arranged between the two locking links.

[0044] In one embodiment, a nano-material containing micro-capsules is added to the heat insulation layer 2 of the downhole saturated steam quality optical fiber monitoring device of the present application. This nano-material has excellent heat energy storage and release functions. During the monitoring process, the high-temperature steam generated in the downhole environment will be transmitted to the central optical fiber through this special heat insulation layer. When encountering sudden high temperature, the micro-capsules in the heat insulation layer can quickly absorb and store a large amount of heat, convert this part of the thermal energy into chemical bond energy and temporarily store it inside the micro-capsules, effectively reducing the impact of sudden temperature change on the central optical fiber. When the temperature drops later, these micro-capsules will slowly release the heat absorbed before, thereby maintaining a relatively stable thermal environment inside the heat insulation layer and the entire monitoring device.

[0045] Specifically, in one embodiment, a composite heat insulation material can be made by mixing a certain proportion of micro-capsules and polymer matrix and used as part of the internal protection structure to achieve this effect. The micro-capsules are preferably composed of polyurethane, silica gel or other suitable materials and filled with phase change substances inside. This material can absorb and release a large amount of heat energy within a certain temperature range without changing its physical state, thus realizing the self-temperature regulation protection effect. For example, the phase change temperature range can be carefully selected according to the actual downhole working temperature to enable the micro-capsules to work efficiently in the common temperature range.

[0046] In one embodiment, as Figure 3As shown, in order to improve the working reliability in the complex downhole environment and extend the service life, a support cushion block 10 with a special strengthening structure is provided at the contact part between the optical fiber bundle 3 and the high-temperature pressure-resistant joint 4, so as to ensure that the optical fiber is not damaged under high-intensity mechanical loads or external pressure impacts, thereby maintaining a high-quality signal transmission efficiency. This support cushion block 10 can not only effectively share the stress from the outside world, but also ensure that the monitoring signal is not distorted when the temperature changes violently or is eroded by chemical substances, and consistently complete the data transmission task. In this way, the overall robustness and data accuracy of the device are greatly improved.

[0047] For example, when manufacturing the above-mentioned specially strengthened support cushion block 10, materials with high thermal stability and physical stability can be used, such as high-strength ceramic composite materials or special alloy materials. At the same time, in the design of the support cushion block 10, the most suitable pressure distribution curve and thickness ratio can be accurately calculated, so that it can not only fully fix the position of the optical fiber, but also effectively absorb vibrations and maximize the compressive capacity, so as to ensure that even in extremely harsh working environmental conditions, the optical fiber remains intact and functions normally. These improvements make this device particularly suitable for long-term deployment in mines or other extreme geographical conditions to perform efficient and stable saturated steam quality monitoring work.

[0048] In one embodiment, as Figure 4 and Figure 5 shown, the downhole saturated steam quality optical fiber monitoring device of the present application is configured with a plurality of evenly distributed heat conduction plates 11 in the middle part of the high-temperature resistant optical fiber conduit 1. The material of the heat conduction plate 11 is preferably a material with good heat conduction performance and can work stably in a high-temperature environment, so that the entire conduit can evenly conduct the generated heat, thereby avoiding the generation of local hot spots. The heat conduction plate 11 not only helps to evenly distribute the heat along the entire length of the optical fiber conduit, but also helps to reduce the risk of optical fiber deformation caused by uneven heat, further improving the optical signal transmission stability. Specifically, this design of evenly distributing heat effectively controls the attenuation of the signal during transmission, thereby ensuring that the monitoring accuracy and the overall working efficiency of the equipment are in the best state. In order to further improve the system performance, the spacing, quantity and material properties of these heat conduction plates 11 can be flexibly adjusted according to the specific working conditions of the downhole environment to ensure the most efficient heat management effect.

[0049] For example, in terms of technical implementation, the heat conduction plate 11 can be made of copper or other alloy materials with excellent heat conduction characteristics. This can ensure the heat conduction effect while not affecting the spatial layout and structural design of the optical fiber monitoring device, making it more suitable for the complex downhole operation environment.

[0050] In another embodiment, the downhole saturated steam quality optical fiber monitoring device of the present application further has a surrounding waterproof shield 12 outside the heat conduction plate 11. This surrounding waterproof shield 12 tightly wraps the heat conduction plate 11 and thus wraps all the core components, including the optical fiber sensor and other important components. This design ensures that even in the event of liquid entering the well accidentally, the important components inside are not affected, avoiding damage caused by liquid intrusion, and thus effectively improving the durability and reliability of the device in a complex downhole environment. In addition, by preventing liquid from penetrating into the core component area, this waterproof shield 12 significantly increases the actual service life of the entire device, reduces the maintenance and replacement frequency, and enables the monitoring device to maintain an efficient and stable working state for a long time.

[0051] For example, in order to achieve the technical goal of providing sufficient protection for the optical fiber monitoring device under harsh conditions, the waterproof shield 12 can be made of a high-density, corrosion-resistant material and designed with a tightly sealed joint to adapt to the high-pressure and high-temperature environment in the well. Specifically, during the production and assembly process, a special tool and technology can be used to ensure the perfect fit of each component, forming a seamless protective barrier. This not only enhances the waterproof and dustproof performance of the entire system but also does not affect the quality and stability of signal transmission. In addition, it is also necessary to make the thermal conductivity of the waterproof shield 12 lower than that of the heat conduction plate 11 to form a preliminary thermal protection.

[0052] During the actual operation process, when this device is in use, first install the high-temperature and high-pressure resistant joint 4 at the corresponding interface of the downhole pipeline system. Through its excellent sealing performance and structural strength, the entire optical fiber monitoring device is firmly fixed in the high-temperature and high-pressure environment in the well. Next, the downhole saturated steam will come into contact with the high-temperature resistant optical fiber conduit 1 when passing through the pipeline. At this stage, the built-in heat insulation layer 2 plays an important role - not only reducing the signal loss caused by the conduction of external high temperature to the optical fiber bundle 3 but also maintaining the stable temperature state of the fiber bundle to ensure accurate data. At the same time, the optical fiber bundle 3 is located in the safe space between the high-temperature resistant optical fiber conduit 1 and the heat insulation layer, extending from the central position of the conduit to the position of the measurement device port outside the well. In this way, the optical fiber cross-section under the double protection of heat insulation and conduit can reliably receive the information of the saturated steam and efficiently transmit it to the external device for processing and analysis. As the impact challenges brought by the high-temperature environment and fluid in the well increase during the operation of the device, more emphasis is placed on the integrated design among various parts to jointly resist the adverse factor interference brought by the extreme environment, effectively improving the accuracy of information collection while ensuring the overall durability of the device, reducing the quality detection error caused by external conditions, and achieving the effect of real-time online monitoring of the saturated steam quality. In short, each component works closely together to effectively achieve continuous and accurate monitoring of the bottom well conditions under harsh conditions.

[0053] The methods, programs, systems, devices, etc. of the embodiments of the present invention can be executed or implemented in a single or multiple networked computers, or can also be practiced in a distributed computing environment. In the embodiments of this specification, in these distributed computing environments, tasks can be executed by remote processing devices connected through a communication network.

[0054] Those skilled in the art should understand that the embodiments of this specification can be provided as a method, a system, or a computer program product. Therefore, those skilled in the art can conceive that the implementation of the functional modules / units or controllers and related method steps illustrated in the above embodiments can be achieved in a software, hardware, or a combination of software and hardware manner.

[0055] Unless explicitly stated, the actions or steps of the methods and programs described according to the embodiments of the present invention do not necessarily have to be executed in a specific order and can still achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0056] In this document, multiple embodiments of the present invention are described. However, for the sake of brevity, the descriptions of each embodiment are not exhaustive, and the same or similar features or parts between various embodiments may be omitted. In this document, "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean applicable to at least one embodiment or example according to the present invention, rather than all embodiments. The above terms do not necessarily refer to the same embodiment or example. Without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0057] The exemplary systems and methods of the present invention have been specifically shown and described with reference to the above embodiments, which are only examples of the best modes for implementing the systems and methods. Those skilled in the art can understand that various changes can be made to the embodiments of the systems and methods described herein when implementing the systems and / or methods without departing from the spirit and scope of the present invention defined in the appended claims.

Claims

1. An optical fiber monitoring device for downhole saturated steam quality, characterized in that Including: A high-temperature resistant optical fiber conduit (1) for protecting the internal optical fiber and conducting saturated steam signals; An internal heat insulation layer (2) installed on the inner side wall of the high-temperature resistant optical fiber conduit (1); An optical fiber bundle (3) placed at the central position inside the heat insulation layer (2) and extending along the high-temperature resistant optical fiber conduit (1) to achieve signal conduction with external measuring equipment; and A high-temperature and high-pressure resistant joint (4) provided at at least one end of the high-temperature resistant optical fiber conduit (1) and fixedly connected to the downhole pipeline system, where The internal heat insulation layer (2) is composed of at least two layers of heat insulation materials. The outer layer is a metal film (6) with a high reflectivity, and the inner layer is a porous silica gel insulator (7). The high-temperature and high-pressure resistant joint (4) adopts a two-stage locking mechanism and is equipped with an expansion collar (9) for compensating temperature difference stress inside it.

2. The downhole saturated steam quality optical fiber monitoring device according to claim 1, characterized in that: The outer surface of the high-temperature resistant optical fiber conduit (1) is provided with an anti-corrosion coating (5).

3. The downhole saturated steam quality optical fiber monitoring device according to claim 1, characterized in that: The optical fiber bundle (3) is coated with an anti-refraction protection layer (8) with a high refractive index.

4. The downhole saturated steam quality optical fiber monitoring device according to claim 1, wherein: The expansion collar (9) is arranged between two locking links.

5. The downhole saturated steam quality optical fiber monitoring device according to claim 1, characterized in that: The internal heat insulation layer (2) is added with nano materials containing microcapsules.

6. The downhole saturated steam quality optical fiber monitoring device according to claim 1, characterized in that: The optical fiber bundle (3) is provided with a support pad (10) at the contact part with the high-temperature and high-pressure resistant joint (4).

7. The downhole saturated steam quality optical fiber monitoring device according to claim 1, characterized in that: A plurality of uniformly distributed heat conduction plates (11) are arranged in the middle part of the high-temperature resistant optical fiber conduit (1).

8. The downhole saturated steam quality optical fiber monitoring device according to claim 7, characterized in that: A surrounding waterproof shield (12) is additionally provided in the device, and the waterproof shield (12) is used to wrap the heat conduction plate (11).

9. The downhole saturated steam quality optical fiber monitoring device according to claim 8, characterized in that: The thermal conductivity of the waterproof shield (12) is lower than that of the heat conduction plate (11).

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