A device for monitoring the effect of carbon dioxide injection on shale fractures

Abstract

The utility model relates to shale monitoring technical field provides a kind of dynamic monitoring device of influence of injecting carbon dioxide to shale fracture, including control module, the transmission pipeline is installed in the outer side wall of control module, the end of transmission pipeline away from control module is installed with support main body, the outer side wall of support main body is respectively installed with temperature sensor, strain sensor, pressure sensor and chemical sensor, respectively for detecting strain, temperature, pressure and chemical information;By integration design, strain, temperature, pressure and chemical sensor are integrated in the same support outer side, and the efficient integration of multi-sensor wire is realized by using wire tube, strain, temperature, pressure and chemical parameters are synchronously collected, the accurate reduction of physical-chemical coupling process is realized, and the time and space error caused by traditional dispersion monitoring is avoided.

Description

Technical Field

[0001] This utility model relates to the field of shale monitoring technology, specifically a dynamic monitoring device for the impact of carbon dioxide injection on shale fractures. Background Technology

[0002] In the fields of shale oil and gas development and CO2 geological utilization, CO2 injection technologies (such as CO2 flooding, CO2 enhanced shale gas recovery, and CO2 geological sequestration) are crucial for improving resource utilization. However, the mechanisms of fracture propagation, changes in mechanical properties, and chemical interactions in shale reservoirs during CO2 injection are complex, requiring real-time monitoring of multiphysics parameters to assess engineering effectiveness and geological safety. Existing technologies have the following shortcomings.

[0003] When CO2 is injected into shale reservoirs, fracture propagation involves the coupling effects of strain field (reservoir rock deformation), temperature field (CO2 phase transition endothermic / exothermic), pressure field (injection pressure distribution), and chemical field (CO2-rock-fluid interaction). Traditional monitoring methods typically use independent sensors to measure a single parameter (such as monitoring only pressure or strain), leading to asynchronous data acquisition times and mismatched spatial locations, making it difficult to accurately reconstruct the dynamic evolution of fractures. For example, if pressure and strain sensors are installed far apart, differences in CO2 diffusion rates may distort the correlation analysis between pressure changes and fracture propagation.

[0004] To address the problems raised in the background art, those skilled in the art have proposed a dynamic monitoring device for the impact of carbon dioxide injection on shale fractures. Utility Model Content

[0005] To address the aforementioned technical problems, this utility model provides a dynamic monitoring device for the impact of carbon dioxide injection on shale fractures. This device integrates strain, temperature, pressure, and chemical sensors on the same support frame and utilizes conduit to integrate the wiring of multiple sensors, enabling simultaneous monitoring of multiple parameters related to shale fracture morphology, mechanical response, and chemical effects during CO2 oil recovery / gas storage.

[0006] A dynamic monitoring device for the impact of carbon dioxide injection on shale fractures includes a control module. A transmission pipeline is installed on the outer wall of the control module. A support body is installed at the end of the transmission pipeline away from the control module. A temperature sensor, a strain sensor, a pressure sensor, and a chemical sensor are respectively installed on the outer wall of the support body for detecting strain, temperature, pressure, and chemical information. A wire-binding mechanism is installed at the rear end of the support body. The wire-binding mechanism includes a rear-end limiting plate, which is located at the rear end of the support body. The transmission pipeline is engaged with the inner side of the rear-end limiting plate. The transmission pipeline is also connected to the input ends of the temperature sensor, strain sensor, pressure sensor, and chemical sensor.

[0007] Preferably, it also includes a limiting component, which includes a limiting sleeve, which is fitted onto the outer wall of the transmission pipeline, and the limiting sleeve is two rings spliced ​​together.

[0008] Preferably, a connecting shaft is installed at the bottom between the two limiting sleeves, two limiting sliders are fixedly connected to the top of the two limiting sleeves, and a connecting sleeve is slidably connected to the outer side wall of the two limiting sliders.

[0009] Preferably, the limiting slider has a groove near the bottom for connecting the sleeve to engage with the outside of the limiting slider, and the outer wall of the bracket body has multiple insertion slots, in which transmission lines are inserted.

[0010] Preferably, an air outlet is provided near the bottom of the main body of the bracket, and an air inlet pipe is installed at the input end of the air outlet for injecting carbon dioxide into the air outlet.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] 1. Through integrated design, strain, temperature, pressure and chemical sensors are integrated on the outside of the same bracket, and the cable conduit is used to achieve efficient integration of multiple sensor wires. Strain (crack deformation), temperature (CO2 phase change heat effect), pressure (injection pressure distribution) and chemical parameters (CO2 concentration, pH value) are collected simultaneously to achieve accurate reproduction of the physical-chemical coupling process and avoid the time and space errors caused by traditional decentralized monitoring. Attached Figure Description

[0013] Figure 1 This is one of the three-dimensional structural schematic diagrams of this utility model;

[0014] Figure 2 This is the second three-dimensional structural schematic diagram of the present invention;

[0015] Figure 3 This utility model Figure 2 Schematic diagram of the mid-to-rear end limit plate;

[0016] Figure 4 This utility model Figure 3 A schematic diagram of the structure of the middle limit sleeve.

[0017] In the diagram: 1. Control module; 2. Transmission pipeline; 3. Support body; 4. Temperature sensor; 5. Strain sensor; 6. Pressure sensor; 7. Chemical sensor; 8. Air outlet; 9. Air inlet duct; 10. Rear end limiting plate; 11. Insertion slot; 13. Limiting sleeve; 14. Connecting shaft; 15. Limiting slider; 16. Connecting sleeve. Detailed Implementation

[0018] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0019] As attached Figure 1 To be continued Figure 4 As shown:

[0020] Example 1: According to Figures 1-4 As shown, this utility model provides a dynamic monitoring device for the impact of carbon dioxide injection on shale fractures, including a control module 1. A transmission pipeline 2 is installed on the outer wall of the control module 1. A support body 3 is installed at the end of the transmission pipeline 2 away from the control module 1. A temperature sensor 4, a strain sensor 5, a pressure sensor 6, and a chemical sensor 7 are respectively installed on the outer wall of the support body 3 for detecting strain, temperature, pressure, and chemical information. A wire-binding mechanism is installed at the rear end of the support body 3. The wire-binding mechanism includes a rear-end limiting plate 10, which is located at the rear end of the support body 3. The transmission pipeline 2 is engaged and connected to the inner side of the rear-end limiting plate 10. The transmission pipeline 2 is also connected to the input ends of the temperature sensor 4, strain sensor 5, pressure sensor 6, and chemical sensor 7, respectively. The system includes a limiting component, which includes a limiting sleeve 13. The limiting sleeve 13 is fitted onto the outer wall of the transmission pipeline 2. The limiting sleeve 13 is formed by two rings spliced ​​together. A connecting shaft 14 is installed at the bottom between the two limiting sleeves 13. Two limiting sliders 15 are fixedly connected to the top of the two limiting sleeves 13. A connecting sleeve 16 is slidably connected to the outer wall of the two limiting sliders 15. A groove is provided near the bottom of the limiting slider 15 for the connecting sleeve 16 to engage with the outer side of the limiting slider 15. Multiple insertion slots 11 are provided on the outer wall of the support body 3. The transmission pipeline 2 is inserted into the multiple insertion slots 11. An air outlet 8 is provided near the bottom of the support body 3. An air inlet pipe 9 is installed at the input end of the air outlet 8 for injecting carbon dioxide into the air outlet 8.

[0021] Strain sensor 5: It adopts a fiber Bragg grating (FBG) sensor with a range of 0-5000με and a resolution of 1με. It is encapsulated in a titanium alloy protective shell and fixed to the surface of the bracket with high-temperature resistant adhesive (such as silicone adhesive).

[0022] Temperature sensor 4: Platinum resistance thermometer (Pt100) or thermocouple (K type) is selected, with a range of -50℃ to 300℃ and an accuracy of ±0.5℃. It is directly embedded in the groove on the surface of the bracket and covered with thermal grease to enhance heat conduction.

[0023] Pressure sensor 6: It adopts a piezoresistive pressure sensor (range 0-100MPa, accuracy ±0.1%FS), which is encapsulated in a stainless steel housing and connected to the bracket by threads. The front end is equipped with an anti-clogging filter.

[0024] Chemical Sensor 7: Integrated micro electrochemical sensor array (monitoring CO2 concentration, pH value, Ca²⁺ / Mg²⁺ concentration), employing ion-selective electrode (ISE) technology, with a response time ≤30s and anti-interference capability ≥95%.

[0025] Working principle: When this device is needed, firstly, insert the temperature sensor 4, strain sensor 5, pressure sensor 6 and chemical sensor 7 into the outer wall of the bracket body 3. Then, pass the transmission line 2 through the insertion slot 11. Then, insert the transmission line 2 into the rear limiting plate 10. By rotating the limiting sleeve 13, the multiple sets of transmission lines 2 are limited together. Then, the connecting sleeve 16 limits the limiting slider 15 to prevent the limiting sleeves 13 from detaching from each other.

[0026] All standard parts used in this invention can be purchased from the market, and irregularly shaped parts can be customized according to the description and drawings. The specific connection methods for each part all employ conventional methods such as bolts, rivets, and welding, which are mature technologies in the prior art. The machinery, parts, and equipment all use conventional models in the prior art, and the circuit connections also use conventional connection methods in the prior art, which will not be detailed here. Any content not described in detail in this specification belongs to the prior art known to those skilled in the art.

[0027] In the description of this utility model, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. "A plurality of" means two or more, unless otherwise explicitly specified.

[0028] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0029] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0030] In the description of this specification, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0031] The accompanying drawings of the embodiments disclosed in this utility model only involve the structures involved in the embodiments disclosed in this utility model. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this utility model can be combined with each other.

[0032] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A device for dynamically monitoring the effect of carbon dioxide injection on shale fractures, characterized by: The system includes a control module (1), on which a transmission line (2) is installed on the outer wall of the control module (1). A support body (3) is installed at the end of the transmission line (2) away from the control module (1). A temperature sensor (4), a strain sensor (5), a pressure sensor (6), and a chemical sensor (7) are respectively installed on the outer wall of the support body (3) for detecting strain, temperature, pressure, and chemical information. A wire harness mechanism is installed at the rear end of the support body (3). The wire harness mechanism includes a rear end limiting plate (10). The rear end limiting plate (10) is located at the rear end of the support body (3). The transmission line (2) is engaged and connected to the inner side of the rear end limiting plate (10). The transmission line (2) is also connected to the input ends of the temperature sensor (4), the strain sensor (5), the pressure sensor (6), and the chemical sensor (7).

2. The device for monitoring the effect of injected carbon dioxide on fractures in shale according to claim 1, wherein: It also includes a limiting component, which includes a limiting sleeve (13), which is fitted on the outer wall of the transmission pipeline (2), and the limiting sleeve (13) is two rings spliced ​​together.

3. The device for monitoring the effect of injected carbon dioxide on fractures in shale according to claim 2, wherein: A connecting shaft (14) is installed at the bottom between the two limiting sleeves (13), and two limiting sliders (15) are fixedly connected to the top of the two limiting sleeves (13). A connecting sleeve (16) is slidably connected to the outer side wall of the two limiting sliders (15).

4. The device for monitoring the effect of injected carbon dioxide on fractures in shale of claim 3, wherein: The limiting slider (15) has a groove near the bottom for connecting the sleeve (16) to engage with the outside of the limiting slider (15). The outer wall of the bracket body (3) has multiple insertion slots (11), and transmission lines (2) are inserted into the multiple insertion slots (11).

5. The apparatus for monitoring the effect of injected carbon dioxide on fractures in shale of claim 1, wherein: The support body (3) has an air outlet (8) near the bottom. An air inlet pipe (9) is installed at the input end of the air outlet (8) for injecting carbon dioxide into the air outlet (8).

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