A pressure swing adsorption device and system for a phase change thermal management system of a logging instrument

Abstract

The present application belongs to the technical fields of well logging heat management, and discloses a pressure-bearing adsorption device and system for a phase change heat management system of a well logging instrument, which comprises a pressure-bearing cylinder and an adsorption gas distribution assembly. The adsorption gas distribution assembly comprises a central gas distribution pipe and a solid adsorbent layer sleeved thereon. The pipe wall of the central gas distribution pipe is provided with a gas distribution hole and an inner cavity forming a fluid axial main flow channel. One end of the pressure-bearing cylinder is formed with a gas inlet for connecting the fluid axial main flow channel with a gaseous refrigerant outlet of the gas-liquid phase change heat management system. The solid adsorbent layer is used for adsorbing the gaseous refrigerant flowing out of the gas distribution hole. The present application realizes the gas adsorption function through the adsorption gas distribution assembly, which can ensure the continuous and smooth operation of the gas-liquid phase change heat management system. The central gas distribution pipe is arranged to penetrate the middle of the solid adsorbent layer. The fluid axial main flow channel of the central gas distribution pipe can realize deep gas transportation, thereby improving the adsorption performance of the adsorption device.

Description

Technical Field

[0001] This invention belongs to the technical field of well logging thermal management, and more specifically, relates to a pressure-bearing adsorption device and system for a well logging instrument phase change thermal management system. Background Technology

[0002] With the continuous advancement of deep oil and gas resource exploration, the depth of logging operations is increasing daily. Logging instruments typically need to operate in environments with extremely high temperatures (≥200°C) and extremely high pressures (≥100 MPa). The electronic components inside the instruments are extremely sensitive to temperature; prolonged exposure to extreme high temperatures can easily lead to thermal degradation or even physical damage. Therefore, to ensure the working life and reliability of the core downhole electronic components, logging instruments must be equipped with an efficient thermal management system. Among existing technical solutions, there is a gas-liquid phase change refrigeration technology that uses pure water as a refrigerant. This technology utilizes the large latent heat during the phase change of the refrigerant from liquid to gas to absorb heat.

[0003] The applicant discovered in their research that a logging tool thermal management system based on gas-liquid phase change exhibits excellent cooling performance. This thermal management system uses water as the phase change medium, utilizing the large amount of latent heat absorbed when water evaporates under specific low-pressure conditions to cool electronic components. However, the management system involves handling the outlet vapor after refrigerant evaporation. The unique characteristics of downhole operations lie in the fact that the logging instrument is completely immersed in high-temperature, high-pressure drilling mud, and the external environmental pressure is much higher than the internal pressure of the system. This prevents the evaporated water vapor from being discharged, thus affecting the application of the gas-liquid phase change thermal management system in logging tools. Summary of the Invention

[0004] In view of the above-mentioned defects or improvement needs of the existing technology, the present invention provides a pressure adsorption device and system for a phase change heat management system for logging tools, which solves the problem of the inability of outlet steam to be discharged when the existing gas-liquid phase change heat management system is applied to logging tools, causing a problem in the treatment.

[0005] To achieve the above objectives, according to one aspect of the present invention, a pressure-bearing adsorption device for a phase change thermal management system of a logging tool is provided, comprising a pressure-bearing adsorption unit, the pressure-bearing adsorption unit comprising a pressure-bearing cylinder and an adsorption gas distribution assembly disposed inside the pressure-bearing cylinder, the adsorption gas distribution assembly comprising a central gas equalization pipe and a solid adsorbent layer sleeved on the outer periphery of the central gas equalization pipe, the central gas equalization pipe having gas distribution holes on its pipe wall, and the inner cavity of the central gas equalization pipe forming a fluid axial mainstream channel; A gas inlet is formed at one end of the pressure-bearing cylinder. The gas inlet is used to connect the axial main fluid channel with the gaseous refrigerant outlet of the gas-liquid phase change heat management system. The solid adsorbent layer is used to adsorb the gaseous refrigerant flowing out through the gas distribution holes.

[0006] According to the pressure adsorption device for phase change thermal management system of logging tool provided by the present invention, the adsorption gas distribution assembly further includes a metal gas distribution plate, the metal gas distribution plate has a porous structure, and multiple layers of the solid adsorbent and multiple metal gas distribution plates are alternately stacked and nested on the outer periphery of the central gas distribution pipe; the axial main flow channel of the fluid is connected to each of the metal gas distribution plates through the gas distribution holes.

[0007] According to the pressure adsorption device for phase change heat management system of logging tool provided by the present invention, the metal gas equalization plate is a sintered metal wire mesh plate or a metal foam plate. And / or, the metal gas equalization sheet is a flexible structure capable of mechanical deformation to absorb the axial stress generated by the adsorption expansion of the solid adsorbent layer.

[0008] According to the pressure adsorption device for phase change heat management system of logging tool provided by the present invention, the outer edge of the metal gas equalization plate is in direct or indirect contact with the inner wall of the pressure-bearing cylinder to construct a continuous solid heat conduction path for radial heat conduction from the inside of the adsorption gas distribution assembly to the pressure-bearing cylinder. And / or, the adsorption gas distribution assembly is provided inside the pressure-bearing cylinder with an axially movable gap.

[0009] According to the pressure-bearing adsorption device for the phase change heat management system of a logging tool provided by the present invention, the pressure-bearing adsorption unit further includes a thin-walled encapsulation cylinder, and the adsorption gas distribution component is encapsulated in the thin-walled encapsulation cylinder to form an independent adsorption gas distribution unit; the independent adsorption gas distribution unit is configured as a modular component that can be integrally pulled out and disassembled along the axial direction of the pressure-bearing cylinder.

[0010] According to the pressure-bearing adsorption device for the phase change heat management system of a logging tool provided by the present invention, the solid adsorbent layer is composed of a porous medium capable of absorbing gas, and the physical form of the porous medium includes powder, granular or annular block structure. When the porous medium is in the form of powder or granules, the pore size or mesh size of the metal gas equalization sheet is smaller than the particle size or mesh size of the porous medium.

[0011] According to the pressure-bearing adsorption device for phase change heat management system of logging tool provided by the present invention, the pressure-bearing adsorption unit further includes a sealing end cap, and the sealing end cap is provided with a first sealing connection structure and a second sealing connection structure. The first end of the pressure-bearing cylinder is an open end, which is detachably and sealed to the second sealing connection structure on the sealing end cap through an end cap fitting structure; the second end of the pressure-bearing cylinder is provided with a recess. The pressure-bearing cylinder has a gas outlet at one end opposite to the gas inlet. When multiple pressure-bearing adsorption units are provided, two adjacent pressure-bearing cylinders are connected by the first sealing connection structure of the sealing end cap and the recessed portion, and are gas-connected to form a cascade adsorption device.

[0012] The pressure adsorption device for the phase change heat management system of a logging tool provided by the present invention further includes a cascaded adapter sleeve; when multiple pressure adsorption units are provided, two adjacent pressure cylinders are detachably and sealedly connected and gas-connected through the cascaded adapter sleeve, and the hollow interior of the cascaded adapter sleeve forms a gas transition chamber.

[0013] According to another aspect of the present invention, a logging tool phase change heat management system is provided, comprising the pressure-bearing adsorption device for the logging tool phase change heat management system as described in any of the above claims; further comprising a two-phase heat exchange channel, wherein the inlet of the two-phase heat exchange channel is used to fill liquid refrigerant, and the outlet of the two-phase heat exchange channel is a gaseous refrigerant outlet used to connect to the gas inlet of the pressure-bearing cylinder, so as to achieve smooth phase change and flow of refrigerant inside the two-phase heat exchange channel through the adsorption of gaseous refrigerant by the pressure-bearing adsorption device.

[0014] According to the phase change heat management system of the logging tool provided by the present invention, the inlet of the two-phase heat exchange channel is used to pulse-charge liquid refrigerant when the temperature of the downhole electronic device is detected to reach a preset threshold.

[0015] In summary, compared with the prior art, the pressure-bearing adsorption device and system for the phase change thermal management system of a well logging tool provided by the present invention are superior: 1. A pressure-bearing adsorption unit is proposed. The pressure-bearing cylinder can adapt to the high-pressure environment downhole. The gas adsorption function is realized through the adsorption gas distribution component. In addition, by absorbing the generated water vapor, the pressure in the low-pressure evaporation zone can be maintained, solving the problem of steam not being able to be discharged and ensuring the continuous and smooth operation of the gas-liquid phase change heat management system. Furthermore, a central gas distribution pipe is proposed to be set through the middle of the solid adsorbent layer in the adsorption gas distribution component. The pipe wall of the central gas distribution pipe is provided with gas distribution holes. The deep gas transport can be realized through the main fluid channel of the central gas distribution pipe, so that the adsorption device can improve the gas penetration and diffusion ability under a large length-to-diameter ratio structure, thereby improving the adsorption performance of the adsorption device. 2. Furthermore, it is proposed that the adsorption gas distribution assembly also be equipped with alternating layers of metal gas equalization plates and solid adsorbents. Through the gas distribution holes and the porous structure of the metal gas equalization plates, a radial diffusion branch is formed that runs through the entire system, which is beneficial to ensure the synchronous reaction of the deep solid adsorbent. 3. The metal gas equalization plate is a flexible structure that can absorb the axial stress generated by the adsorption expansion of adjacent solid adsorbents by utilizing its mechanical deformation capability, thus preventing deformation of the pressure-bearing shell; the outer edge of the metal gas equalization plate forms physical contact with the inner wall of the pressure-bearing cylinder, and a radial heat conduction network is constructed by utilizing the good thermal conductivity of the metal to conduct the heat released by the adsorption reaction radially to the external mud environment, maintaining the high efficiency of the adsorption process. 4. By using thin-walled encapsulation cylinders to integrate bulk adsorption materials into independent adsorption and gas distribution units, making them consumable components that can be quickly replaced in harsh operating environments; through the combination of cascaded adapter sleeves and the first and second connection ends, the system is given scalability, and operators can flexibly increase or decrease the number of pressurized adsorption containers according to the actual well temperature and operating time. Attached Figure Description

[0016] Figure 1 This is a cross-sectional schematic diagram of the multi-stage series connection and internal gas flow of the cascade adsorption device provided in an embodiment of the present invention.

[0017] Figure 2 This is a schematic diagram of the axial explosion assembly of a pressure adsorption container.

[0018] Figure 3 This is an isometric quarter-section view of an independent adsorption unit.

[0019] Figure 4 This is a schematic diagram showing the connection details at the adjacent connection points of the cascade adsorption device.

[0020] Figure 5 This is a schematic diagram of the radial cross-section of a pressure adsorption vessel.

[0021] In all the accompanying drawings, the same reference numerals are used to denote the same elements or structures, wherein: 1-Pressure-bearing adsorption unit; 2-Independent adsorption and gas distribution unit; 3-Cascade adsorption device; 11-Gas inlet; 12-Gas outlet; 13-Pressure-bearing cylinder; 14-Sealed end cap; 15-First connecting end; 16-Second connecting end; 21-Thin-walled encapsulation cylinder; 22-Central gas equalization pipe; 23-Solid adsorbent layer; 24-Metal gas equalization plate; 31-Cascade adapter sleeve; 32-Gas transition chamber; 131-End cap mating part; 141-First sealing connection structure; 142-Second sealing connection structure; 221-Gas distribution hole; 311-First cascade mating end; 312-Second cascade mating end. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0023] Please see Figure 1 This embodiment provides a pressure-bearing adsorption device for a phase change heat management system of a logging tool. The pressure-bearing adsorption device includes a pressure-bearing adsorption unit 1. The pressure-bearing adsorption unit 1 includes a pressure-bearing cylinder 13 and an adsorption gas distribution assembly disposed inside the pressure-bearing cylinder 13. The adsorption gas distribution assembly includes a central gas equalization pipe 22 and a solid adsorbent layer 23 sleeved on the outer periphery of the central gas equalization pipe 22. The pipe wall of the central gas equalization pipe 22 is provided with gas distribution holes 221, and the inner cavity of the central gas equalization pipe 22 forms a fluid axial mainstream channel. One end of the pressure-bearing cylinder 13 is formed with a gas inlet 11. The gas inlet 11 is used to connect the fluid axial main channel with the gaseous refrigerant outlet of the gas-liquid phase change heat management system. The solid adsorbent layer 23 is used to adsorb the gaseous refrigerant flowing out through the gas distribution hole 221.

[0024] This embodiment addresses the current situation where the gaseous refrigerant after evaporation and heat exchange in the logging tool's phase change heat management system cannot be discharged and is usually only temporarily stored inside the sealed instrument. It proposes to set up a pressure-bearing adsorption unit 1. The pressure-bearing cylinder 13 can adapt to the high-pressure environment downhole. The gas adsorption function is realized through the adsorption gas distribution component. By configuring the corresponding adsorption device to absorb the generated water vapor, the pressure in the low-pressure evaporation zone can be maintained, ensuring the continuous and smooth operation of the gas-liquid phase change heat management system.

[0025] Furthermore, considering the adsorption rate, capacity, and stability of the adsorption device, the cooling power and continuous operation time of the entire thermal management system are directly determined. However, existing adsorption devices, when applied to logging instruments, have the following significant technical bottlenecks: limited by the wellbore size, the internal space of the logging instrument exhibits a long and narrow aspect ratio. Traditional adsorption devices use a method of directly filling solid adsorbent, which prevents water vapor from achieving deep penetration and diffusion, severely reducing the effectiveness of the adsorbent.

[0026] Based on this, the pressure-bearing adsorption unit 1 provided in this embodiment can be in the form of a long cylindrical structure to adapt to the downhole environment. It is proposed that a central gas distribution pipe 22 be installed through the middle of the solid adsorbent layer 23 in the adsorption gas distribution assembly. Gas distribution holes 221 are distributed on the pipe wall of the central gas distribution pipe 22. The inner cavity of the central gas distribution pipe 22 forms the main axial channel of the fluid. Thus, the gaseous refrigerant enters the main axial channel of the fluid through the gas inlet 11. During the flow along the main axial channel of the fluid, it will diffuse to the surrounding area through the gas distribution holes 221 in the axial direction. This is beneficial for the solid adsorbent in each part along the axial direction to come into contact with the gaseous refrigerant and adsorb it. This allows the adsorption device to improve the gas penetration and diffusion ability under a large length-to-diameter ratio structure, thereby improving the adsorption performance of the adsorption device. It can be applied to the gas-liquid phase change heat management system of the logging tool.

[0027] Optionally, the refrigerant in the logging tool phase change thermal management system can be pure water.

[0028] In some embodiments, the adsorption gas distribution assembly further includes a metal gas equalization plate 24, which has a porous structure. Multiple layers of the solid adsorbent layer 23 and multiple metal gas equalization plates 24 are alternately stacked and sleeved on the outer periphery of the central gas equalization pipe 22. The main axial flow channel of the fluid is connected to each metal gas equalization plate 24 through the gas distribution hole 221.

[0029] The adsorption and gas distribution assembly provided in this embodiment includes a central gas equalization pipe 22, and solid adsorbent and metal gas equalization plates 24 coaxially fitted around the outer periphery of the central gas equalization pipe 22 and alternately stacked along the axial direction. In the specific airflow conduction path, the gas inlet 11, the main axial fluid channel, and the gas outlet 12 are connected in sequence. Water vapor entering the gas inlet 11 can flow axially along the inner cavity of the central gas equalization pipe 22, and the main axial fluid channel is connected to the porous structure inside the metal gas equalization plate 24 through the gas distribution holes 221. Through this structure, gaseous refrigerant such as water vapor can achieve uniform depth diffusion in the radial direction through the metal gas equalization plate 24, and then diffuse radially into the interior of the surrounding solid adsorbent, constructing a gas diffusion network distributed radially from the center, avoiding the problem of local media being unable to participate in the reaction due to single axial gas flow.

[0030] refer to Figure 3 The air distribution holes 221 on the central air distribution pipe 22 can be circular, elongated, or any other shape, with the aim of being distributed throughout the pipe wall to improve the uniformity of diffusion, and no specific limitation is made.

[0031] In some embodiments, the metal gas equalization sheet 24 is a sintered metal wire mesh sheet or a metal foam sheet; The metal gas equalization plate 24 is a flexible structure capable of mechanical deformation to absorb the axial stress generated by the expansion of the solid adsorbent layer 23 after adsorption. Since the solid adsorbent expands in volume after adsorption, the flexible metal gas equalization plate 24 absorbs the axial stress generated by the expansion of the solid adsorbent through its own mechanical deformation, thereby preventing the pressure-bearing cylinder 13 from being deformed under pressure.

[0032] In some embodiments, considering that solid adsorbents release a large amount of heat of reaction when absorbing water vapor, and that traditional adsorption beds have extremely low thermal conductivity, heat accumulates in the adsorbent, significantly weakening the adsorption performance of the adsorption material. Therefore, it is proposed that the outer edge of the metal gas distribution plate 24 be in direct or indirect contact with the inner wall of the pressure-bearing cylinder 13 to construct a continuous solid heat conduction path for radial heat transfer from the interior of the adsorption gas distribution assembly to the pressure-bearing cylinder 13.

[0033] The adsorption gas distribution assembly is disposed inside the pressure-bearing cylinder 13 with an axially movable gap. That is, the adsorption gas distribution assembly is not completely fixed in the axial direction inside the pressure-bearing cylinder 13, but has a certain movable gap, so that the solid adsorbent has a certain deformation space, further avoiding the expansion of the solid adsorbent after adsorption, which would cause the pressure-bearing cylinder 13 to be deformed under pressure.

[0034] In some embodiments, the pressure-bearing adsorption unit 1 further includes a thin-walled encapsulation cylinder 21, and the adsorption gas distribution assembly is encapsulated within the thin-walled encapsulation cylinder 21 to form an independent adsorption gas distribution unit 2; the independent adsorption gas distribution unit 2 is configured as a modular assembly that can be pulled out and disassembled as a whole along the axial direction of the pressure-bearing cylinder 13. That is, the adsorption gas distribution assembly and the thin-walled encapsulation cylinder 21 form a modular assembly, which allows the entire independent adsorption gas distribution unit 2 to be extracted and replaced in a single operation after the adsorption material fails.

[0035] When the thin-walled encapsulation cylinder 21 is not used, the outer edge of the metal gas equalization plate 24 can directly contact the inner wall of the pressure-bearing cylinder 13. When the thin-walled encapsulation cylinder 21 is used, the outer edge of the metal gas equalization plate 24 contacts the inner wall of the thin-walled encapsulation cylinder 21, and the outer wall of the thin-walled encapsulation cylinder 21 then fits into contact with the inner wall of the pressure-bearing cylinder 13, as shown below. Figure 5 As shown, this structure creates a continuous solid heat conduction path that conducts heat radially from the inside of the adsorption gas distribution assembly to the pressure-bearing cylinder 13, allowing the heat generated by the reaction of the solid adsorbent to be discharged along the flexible metal gas distribution plate 24 to the pressure-bearing cylinder 13 and the external environment.

[0036] Furthermore, the thin-walled encapsulation cylinder 21 has a thin-walled hollow structure, with end caps at both ends and at least one end detachably connected to the end cap. When setting up the adsorption and gas distribution assembly, the end cap can be opened first, and the solid adsorbent layer 23 and the metal gas equalization sheet 24 can be set layer by layer. Finally, the end cap is connected to achieve encapsulation. The internal adsorption and gas distribution assembly has an axial clearance.

[0037] In some embodiments, the solid adsorbent layer 23 is composed of a porous medium capable of absorbing gases (e.g., molecular sieves, calcium oxide, or porous zeolite). The physical form of the porous medium includes powder, granules, or annular block structures. When the porous medium is in powder or granule form, the pore size or mesh size of the metal gas equalization plate 24 is smaller than the particle size or mesh size of the porous medium. Therefore, the solid adsorbent layer 23 can be formed directly by filling with solid adsorbent, and the metal gas equalization plate 24 can be used to limit the movement of the solid adsorbent layer 23.

[0038] In some embodiments, considering that existing logging tool thermal management components are typically custom-designed and cumbersome to fill with adsorbent, they not only struggle to adapt to the flexible thermal load requirements of different exploration tasks but also fail to meet the operational requirements for rapid component deployment at the work site. Therefore, a cascaded adsorption device 3 is also provided as follows: refer to Figure 1 and Figure 2 The pressure-bearing adsorption unit 1 further includes a sealing end cap 14, which has a first sealing connection structure 141 and a second sealing connection structure 142. The sealing connection structure is a connection structure that can achieve a seal, such as a threaded structure with a sealing ring. The first end of the pressure-bearing cylinder 13 is an open end, and the open end of the pressure-bearing cylinder 13 is provided with an end cap fitting structure 131. The open end is detachably and sealed to the second sealing connection structure 142 on the sealing end cap 14 through the end cap fitting structure 131; thus achieving high-pressure sealing of the single container to the external mud environment.

[0039] The second end of the pressure-bearing cylinder 13 is provided with a recess; the end of the pressure-bearing cylinder 13 opposite to the gas inlet 11 also forms a gas outlet 12. When multiple pressure-bearing adsorption units 1 are provided, two adjacent pressure-bearing cylinders 13 are detachably and sealed together through the first sealing connection structure 141 of the sealing end cap 14 and the recess, and are gas-connected to form a cascade adsorption device 3. The gas-connected arrangement means that the gas outlet 12 of the previous pressure-bearing cylinder 13 is connected to the gas inlet 11 of the next pressure-bearing cylinder 13.

[0040] In this embodiment, the pressure-bearing cylinder 13, the detachable sealing end cap 14 connected to one end of the pressure-bearing cylinder 13, and the adsorption gas distribution assembly built into the pressure-bearing cylinder 13 together form a pressure-bearing adsorption container. Gas inlet 11 and gas outlet 12 are formed at both ends of the pressure-bearing adsorption container, and a first connecting end 15 and a second connecting end 16 are formed at both ends of the pressure-bearing adsorption container. The first connecting end 15 and the second connecting end 16 are constructed to be connected end-to-end to achieve cascading.

[0041] In some embodiments, the pressure adsorption device further includes a cascaded adapter sleeve 31; when multiple pressure adsorption units 1 are provided, two adjacent pressure cylinders 13 are detachably and sealed together by the cascaded adapter sleeve 31 and are connected in gas communication, and the interior of the cascaded adapter sleeve 31 is hollow to form a gas transition chamber.

[0042] Specifically, the first sealing connection structure 141 is configured to seal with the recess of the adjacent pressure-bearing cylinder 13 or the cascade transition sleeve 31 when multiple pressure-bearing adsorption containers are cascaded.

[0043] Optionally, a cascaded adapter sleeve 31 can be provided, in which the second end recess of one of the two adjacent pressure-bearing cylinders 13 is detachably and sealingly connected to the first sealing connection structure 141 of the sealing end cap 14 of the other pressure-bearing cylinder 13 through the cascaded adapter sleeve 31. Figure 1 and Figure 4 As shown, a cascade adsorption device 3 is provided to expand the adsorption capacity of the device to adapt to different operating times and total adsorption requirements. The cascade adsorption device 3 includes at least two pressure-bearing adsorption containers as described in the above embodiments, and at least one cascade adapter sleeve 31.

[0044] Preferably, in two adjacent pressure adsorption containers, the second connection end 16 of the preceding pressure adsorption container and the first connection end 15 of the following pressure adsorption container are detachably and sealingly connected via a cascaded adapter sleeve 31 (e.g., through a threaded connection with a sealing ring). Figure 4 As shown, the cascaded adapter sleeve 31 has a first cascaded mating end 311 and a second cascaded mating end 312, forming a gas transition chamber 32 between the first cascaded mating end 311 and the second cascaded mating end 312. The gas outlet 12 of the preceding pressurized adsorption container is connected to the gas inlet 11 of the following pressurized adsorption container via the gas transition chamber 32. Water vapor entering the cascaded adsorption device 3, before being completely absorbed by the preceding pressurized adsorption container, can smoothly enter the following pressurized adsorption container via the gas transition chamber to continue adsorption, thereby achieving an elastic expansion of the total adsorption capacity. The gas transition chamber 32 formed by the cascaded adapter sleeve 31 facilitates the smooth flow of gas between the two pressurized cylinders 13.

[0045] To address the shortcomings of existing technologies, such as difficulty in gas penetration and diffusion within confined spaces with large aspect ratios, easy accumulation of internal adsorption reaction heat, and lack of system-level heat load matching and expansion capabilities, this embodiment provides a pressure-bearing adsorption container and cascade device for a well logging tool phase change thermal management system. Gas diffuses radially after entering the gas equalization plate through the central main channel and gas distribution holes 221; the outer edge of the gas equalization plate radially discharges reaction heat and absorbs adsorption expansion stress. The components are further encapsulated within a thin-walled encapsulation cylinder 21 to form independent adsorption units. The cascade device achieves sealed cascading of multiple containers through an adapter sleeve. This embodiment eliminates gas diffusion dead zones, suppresses reaction heat accumulation, and enables rapid overall replacement of the adsorbent and scalability of adsorption capacity.

[0046] In some embodiments, a logging tool phase change heat management system is also provided. The system includes the pressure-bearing adsorption device for the logging tool phase change heat management system as described in any of the above embodiments; it also includes a two-phase heat exchange channel, wherein the inlet of the two-phase heat exchange channel is used to fill liquid refrigerant, and the outlet of the two-phase heat exchange channel is a gaseous refrigerant outlet used to connect to the gas inlet 11 of the pressure-bearing cylinder 13, so as to maintain the pressure range inside the two-phase heat exchange channel by adsorbing the gaseous refrigerant through the pressure-bearing adsorption device, thereby realizing the smooth phase change and flow of the refrigerant inside the two-phase heat exchange channel.

[0047] In some embodiments, the inlet of the two-phase heat exchange channel is used to pulse-charge liquid refrigerant when the temperature of the downhole electronic device reaches a preset threshold. Furthermore, a single pulse can charge a fixed amount of liquid refrigerant. A thermal insulation structure can also be provided between the pressure adsorption device and the two-phase heat exchange channel to prevent cold leakage at the channel and ensure heat exchange efficiency. The thermal insulation structure can be a heat plug, vacuum insulation, a thermal insulation shell, etc., and is not specifically limited.

[0048] The logging tool phase change thermal management system provided in this embodiment involves the initial flash evaporation of liquid refrigerant upon entering the two-phase heat exchange channel due to the pressure drop at the inlet. The evaporative expansion then drives the gas-liquid mixture of refrigerant along the channel. Furthermore, the adsorption of gaseous refrigerant at the outlet promotes continuous evaporation and phase change due to pressure maintenance. This evaporative expansion further enhances flow. This allows the refrigerant to effectively and fully undergo phase change to improve heat exchange performance and flow smoothly through the entire two-phase heat exchange channel, making it suitable for applications with large aspect ratios and offering high heat exchange efficiency and cooling uniformity. The two-phase heat exchange channel can be located inside the circuit frame, whose surface is used to connect and mount downhole electronic devices, thus enabling effective thermal management of these devices.

[0049] In some embodiments, the two-phase heat exchange channel may optionally be in a pre-vacuum state, i.e., pre-vacuumed before use downhole, so that a negative pressure state can be maintained during operation. This negative pressure can promote the evaporation phase change of the refrigerant, allowing for a more complete phase change and thus improving the heat exchange effect. The adsorption device may also be in a pre-vacuum state. A throttling component may also be provided at the inlet of the two-phase heat exchange channel to initially throttle the liquid refrigerant flowing into the channel, further promoting the evaporation phase change. The liquid refrigerant may also be introduced into the two-phase heat exchange channel at a preset pressure, making the inlet pressure higher than the outlet pressure, thus better maintaining the continuous evaporation and flow of the refrigerant. The outlet pressure of the two-phase heat exchange channel may be lower than the saturation pressure corresponding to a preset temperature threshold to ensure smooth phase change of the refrigerant. The preset temperature threshold can be set according to the target temperature control temperature of the electronic device, and can be set empirically. Generally, the temperature resistance limit of downhole electronic devices does not exceed 175°C; for example, the preset temperature threshold can be set to 150°C.

[0050] Furthermore, this embodiment considers that the amount of refrigerant that can be carried in downhole conditions is limited, and continuous injection would be wasteful. Therefore, it proposes periodically injecting refrigerant, such as pure water, into the heat-generating area in a pulsed manner. This minimizes the amount of refrigerant used while achieving effective thermal management, adapting to the downhole environment and increasing the duration of thermal management. Since the adsorption device at the outlet maintains the pressure in the evaporation zone, this setup ensures that the refrigerant can smoothly undergo phase change during pulsed refrigerant injection, allowing it to flow smoothly through the entire channel under the force of phase change expansion, thereby improving cooling uniformity and ensuring heat exchange efficiency.

[0051] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A pressure-bearing adsorption device for a phase change heat management system of a well logging tool, characterized in that, The device includes a pressure-bearing adsorption unit, which includes a pressure-bearing cylinder and an adsorption gas distribution assembly disposed inside the pressure-bearing cylinder. The adsorption gas distribution assembly includes a central gas equalization pipe and a solid adsorbent layer sleeved on the outer periphery of the central gas equalization pipe. The central gas equalization pipe has gas distribution holes on its pipe wall, and the inner cavity of the central gas equalization pipe forms a fluid axial mainstream channel. A gas inlet is formed at one end of the pressure-bearing cylinder. The gas inlet is used to connect the axial main fluid channel with the gaseous refrigerant outlet of the gas-liquid phase change heat management system. The solid adsorbent layer is used to adsorb the gaseous refrigerant flowing out through the gas distribution holes.

2. The pressure-bearing adsorption device for the phase change heat management system of a logging tool as described in claim 1, characterized in that, The adsorption gas distribution assembly also includes metal gas equalization plates, which have a porous structure. Multiple layers of the solid adsorbent and multiple metal gas equalization plates are alternately stacked and nested around the outer periphery of the central gas equalization pipe. The axial main flow channel of the fluid is connected to each of the metal gas equalization plates through the gas distribution holes.

3. The pressure-bearing adsorption device for the phase change heat management system of a well logging tool as described in claim 2, characterized in that, The metal gas equalization sheet is a sintered metal wire mesh sheet or a metal foam sheet; And / or, the metal gas equalization sheet is a flexible structure capable of mechanical deformation to absorb the axial stress generated by the adsorption expansion of the solid adsorbent layer.

4. The pressure-bearing adsorption device for the phase change heat management system of a well logging tool as described in claim 2, characterized in that, The outer edge of the metal gas distribution plate is in direct or indirect contact with the inner wall of the pressure-bearing cylinder to construct a continuous solid heat conduction path that conducts heat radially from the inside of the adsorption gas distribution assembly to the pressure-bearing cylinder. And / or, the adsorption gas distribution assembly is provided inside the pressure-bearing cylinder with an axially movable gap.

5. The pressure-bearing adsorption device for a phase change thermal management system of a well logging tool as described in any one of claims 1-4, characterized in that, The pressure-bearing adsorption unit also includes a thin-walled encapsulation cylinder, and the adsorption gas distribution component is encapsulated in the thin-walled encapsulation cylinder to form an independent adsorption gas distribution unit; the independent adsorption gas distribution unit is configured as a modular component that can be pulled and disassembled as a whole along the axial direction of the pressure-bearing cylinder.

6. The pressure-bearing adsorption device for the phase change thermal management system of a well logging tool as described in claim 2, characterized in that, The solid adsorbent layer is composed of a porous medium capable of absorbing gas, and the physical form of the porous medium includes powder, granules or ring block structure. When the porous medium is in the form of powder or granules, the pore size or mesh size of the metal gas equalization sheet is smaller than the particle size or mesh size of the porous medium.

7. The pressure-bearing adsorption device for a phase change heat management system of a well logging tool as described in any one of claims 1-4, characterized in that, The pressure-bearing adsorption unit also includes a sealing end cap, which is provided with a first sealing connection structure and a second sealing connection structure. The first end of the pressure-bearing cylinder is an open end, which is detachably and sealed to the second sealing connection structure on the sealing end cap through an end cap fitting structure; the second end of the pressure-bearing cylinder is provided with a recess. The pressure-bearing cylinder has a gas outlet at one end opposite to the gas inlet. When multiple pressure-bearing adsorption units are provided, two adjacent pressure-bearing cylinders are connected by the first sealing connection structure of the sealing end cap and the recessed portion, and are gas-connected to form a cascade adsorption device.

8. The pressure-bearing adsorption device for a phase change heat management system of a well logging tool as described in any one of claims 1-4, characterized in that, It also includes cascaded adapter sleeves; when multiple pressure-bearing adsorption units are provided, two adjacent pressure-bearing cylinders are detachably and sealed together by the cascaded adapter sleeves and are connected in gas communication, and the hollow interior of the cascaded adapter sleeves forms a gas transition chamber.

9. A phase change thermal management system for a well logging tool, characterized in that, The device includes a pressure-bearing adsorption device for a phase change heat management system of a logging tool, as described in any one of claims 1-8; it also includes a two-phase heat exchange channel, wherein the inlet of the two-phase heat exchange channel is used to fill liquid refrigerant, and the outlet of the two-phase heat exchange channel is a gaseous refrigerant outlet used to connect to the gas inlet of the pressure-bearing cylinder, so as to achieve smooth phase change and flow of refrigerant inside the two-phase heat exchange channel through the adsorption of gaseous refrigerant by the pressure-bearing adsorption device.

10. The logging tool phase change thermal management system as described in claim 9, characterized in that, The inlet of the two-phase heat exchange channel is used to pulse-charge liquid refrigerant when the temperature of the downhole electronic device reaches a preset threshold.

Images