A monitoring device and method for monitoring the hydration process of cement slurry and formation channeling

Abstract

The application provides a monitoring device for cement slurry hydration process and formation channeling, which comprises a main body mechanism, the main body mechanism comprises a first sleeve, a second sleeve sleeved outside the first sleeve and used for containing cement slurry, and a first sealing cover and a second sealing cover used for plugging the annulus of the first sleeve and the second sleeve, an electric resistance monitoring mechanism arranged on the first sleeve, and a channeling monitoring mechanism used for injecting channeling fluid into the annulus, wherein an acquisition module connected with the first sleeve and the electric resistance monitoring mechanism respectively and used for recording cement slurry electric resistance is arranged outside the second sleeve, and the acquisition module is configured to be capable of calculating electric resistivity through a formula, so that the channeling state of the cement slurry can be judged by observing the change of the electric resistivity.

Description

Technical Field

[0001] This invention relates to the field of oil and gas well cementing, and more specifically to a monitoring device and a monitoring method for the cement slurry hydration process and formation flow. Background Technology

[0002] During the setting process of cement slurry, the slurry transforms from a liquid to a solid state. Due to weight loss, the effective pressure at the bottom of the well decreases, making it difficult to stabilize formation fluids or causing cement slurry to cross channels. This allows formation fluids to infiltrate the annulus, resulting in annular flow. In addition, perforation, acidizing, fracturing, and other construction operations, as well as the complex downhole environment such as high temperature and pressure and erosion by mixed fluids, can damage the cement stone, causing annular flow.

[0003] However, annular crossflow in oil and gas wells can not only reduce oil and gas well production, affect the development of producing layers, reduce casing strength and service life, but may even cause uncontrollable blowouts due to excessive wellhead pressure. Therefore, monitoring annular crossflow in oil and gas wells can effectively reduce operational risks, extend the service life of oil and gas wells, and improve economic benefits.

[0004] Currently, there are two methods for evaluating annular crossflow: theoretical calculation and experimental simulation. Theoretical calculation methods include the equilibrium pressure method, the air crossflow potential coefficient method, and the cement slurry performance coefficient method. However, these methods are relatively crude and are only applicable to evaluating crossflow problems caused by the weight loss of cement slurry. Furthermore, the timing of the weight loss of cement slurry cannot be clearly determined. Experimental simulation methods mainly determine the existence of crossflow by measuring the pressure of the cement slurry column, the change in pressure difference, and the flow rate of the crossflowing fluid. However, they cannot determine the hydration state of the cement slurry.

[0005] Therefore, it is desirable in the art to provide a monitoring device for the hydration process of cement slurry and formation flow in wells to solve the above-mentioned technical problems. Summary of the Invention

[0006] The purpose of this invention is to provide a monitoring device for the hydration process and formation flow of cement slurry in well cementing, which can accurately monitor the hydration process and flow status of cement slurry by acquiring electrical signals of cement slurry.

[0007] According to a first aspect of the present invention, a monitoring device for the hydration process of cement slurry and formation flow in well cementing is provided, comprising a main body, the main body comprising a first sleeve, a second sleeve sleeved outside the first sleeve for containing cement slurry, and a first sealing cap and a second sealing cap for sealing the annulus between the first sleeve and the second sleeve.

[0008] A resistance monitoring mechanism installed on the first sleeve, and

[0009] A flow monitoring mechanism for injecting cross-flow fluid into the annulus.

[0010] The second sleeve is equipped with a data acquisition module that is connected to the first sleeve and the resistance monitoring mechanism respectively and is used to record the resistance of cement slurry. The data acquisition module is configured to calculate the resistivity by formula, so that the cement slurry flow status can be judged by observing the change in resistivity.

[0011] In one embodiment, the resistance monitoring mechanism includes a conductive sleeve mesh sleeved outside the first sleeve, sleeve buckles disposed on both sides of the conductive sleeve mesh, and an insulating annular mesh disposed on the end face of the conductive sleeve mesh.

[0012] In one embodiment, the raw material weight composition of the sleeve buckle and the insulating ring mesh includes 40% to 60% epoxy resin, 25% to 35% glass fiber, 5% to 15% aromatic amine epoxy resin curing agent, and 7% to 15% ceramic.

[0013] In one embodiment, the insulating ring mesh is connected to the conductive sleeve mesh by an adhesive material.

[0014] In one embodiment, the raw material weight composition of the adhesive material includes 17% to 27% epoxy resin, 55% to 60% aromatic amine epoxy resin curing agent, and 15% to 25% quaternary ammonium salt accelerator.

[0015] In one embodiment, a valve body is provided on the first sealing cover.

[0016] The crossflow monitoring mechanism includes an injection module for controlling the flow direction of the crossflow fluid, a flow meter disposed between the injection module and the valve body, and a collection module disposed on the second sealing cover for recording crossflow fluid data.

[0017] In one embodiment, the second sleeve is provided with a first sensor that extends into the annulus and is used to record pressure changes.

[0018] In one embodiment, the monitoring device further includes a temperature control mechanism, which includes a second sensor and a heater spaced apart inside the first sleeve, a condensate pipe wound around the second sensor, and a temperature controller disposed outside the second sleeve and connected to the second sensor.

[0019] In one embodiment, the monitoring device further includes a data acquisition unit connected to the acquisition module, the collection module, and the temperature controller, respectively.

[0020] According to a second aspect of the present invention, a monitoring method is provided, which utilizes a monitoring device according to the above description, comprising the following steps:

[0021] S1. Cement slurry is poured into the annular cavity and sealed by the first sealing cap and the second sealing cap.

[0022] S2. Set the formation pressure, formation temperature, formation fluid crossflow activation conditions and data acquisition interval;

[0023] S3. The data acquisition unit acquires the cement slurry resistance data and calculates the resistivity according to the formula, so that the cement slurry flow status can be judged by observing the change in resistivity.

[0024] Compared with the prior art, the advantages of the present invention are as follows:

[0025] Firstly, this invention can accurately monitor the hydration process and flow state of cement slurry by acquiring electrical signals of the cement slurry.

[0026] Specifically, this device not only includes a flow monitoring mechanism to accurately simulate the activation conditions of formation fluid flow, but also a resistance monitoring mechanism to acquire cement slurry resistance data through a data acquisition module. Then, resistivity and resistivity change rate are calculated according to Formula 1 and Formula 2, respectively. Thus, the fluctuation of resistivity or resistivity change rate can be used to characterize and evaluate the cement slurry flow state, providing reference and guidance for the research and development of anti-flow cement slurry systems and the study of cement ring sealing integrity.

[0027] Secondly, this invention can provide a simulated environment for the cement slurry hydration process and formation flow, thereby ensuring the integrity and firmness of the cement sheath seal, further ensuring the accuracy and authenticity of the cement slurry hydration process and flow information, and thus ensuring that the experimental data and experimental laws obtained in the simulation work can provide good guidance for downhole operations. Attached Figure Description

[0028] The invention will now be described in detail with reference to the accompanying drawings, in which:

[0029] Figure 1 The schematic diagram illustrates the structure of a monitoring device for the cement slurry hydration process and formation flow according to the present invention;

[0030] Figure 2 The schematic diagram illustrates the structure of the resistance monitoring mechanism in this invention;

[0031] Figure 3 This is a top view of the resistance monitoring mechanism in this invention;

[0032] Figure 4 This is a line graph showing the changes in the resistivity of cement slurry gas channeling and the pressure of the liquid column in the first embodiment.

[0033] Figure 5This is a line graph showing the change rate of relative resistivity of cement slurry gas channeling and the change of liquid column pressure in the first embodiment.

[0034] Figure 6 This is a line graph showing the changes in cement slurry gas channeling resistivity and liquid column pressure in the second embodiment.

[0035] Figure 7 This is a line graph showing the change rate of relative resistivity of cement slurry gas channeling and the change of liquid column pressure in the second embodiment.

[0036] In the accompanying drawings, the same parts use the same reference numerals. The drawings are not drawn to scale. Detailed Implementation

[0037] To make the technical solutions and advantages of the present invention clearer, exemplary embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not an exhaustive list of all embodiments. Furthermore, without conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0038] In the description of this invention, it should be understood that 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. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0039] In this invention, unless otherwise explicitly specified and limited, the terms "installation", "connection", "linking", "fixing", etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components.

[0040] Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0041] The invention will now be further described with reference to the accompanying drawings.

[0042] Figure 1 The schematic diagram illustrates the structure of a monitoring device 100 for monitoring the cement slurry hydration process and formation flow according to the present invention.

[0043] like Figure 1As shown, according to a first aspect of the present invention, a monitoring device 100 for monitoring the hydration process of cement slurry and formation flow in well cementing is provided, mainly comprising a main body structure. The main body structure includes a first sleeve 11, a second sleeve 12 sleeved outside the first sleeve 11, and a first sealing cap 13 and a second sealing cap 14 disposed at both ends of the first sleeve 11 and the second sleeve 12. Preferably, an annulus 101 for containing cement slurry is formed between the first sleeve 11 and the second sleeve 12, and the first sealing cap 13 and the second sealing cap 14 can directly seal the annulus 101 to form a sealed structure for the main body structure, thereby facilitating subsequent monitoring work.

[0044] Preferably, both the first sleeve 11 and the second sleeve 12 are made of metal, and the first sleeve 11 is used to simulate cementing casing, while the second sleeve 12 is used to simulate upper casing or open hole formation.

[0045] According to the present invention, such as Figure 1 As shown, the monitoring device 100 for the cement slurry hydration process and formation flow also includes a resistance monitoring mechanism installed on the first sleeve 11, and a flow monitoring mechanism for injecting flow fluid into the annulus 101. Therefore, this method can accurately simulate the cement slurry hydration process and formation flow, ensuring that the experimental data and patterns obtained in the simulation provide good guidance for downhole operations.

[0046] In one embodiment of the present invention, such as Figure 1 As shown, a data acquisition module 15 is provided outside the second sleeve 12, and the data acquisition module 15 can be connected to the first sleeve 11 and the resistance monitoring mechanism respectively for real-time recording of cement slurry resistance. Preferably, the data acquisition module 15 can convert the cement slurry resistance into resistivity using Formula 1 (described below), and then the cement slurry flow status can be determined by observing the change in resistivity.

[0047] Formula 1:

[0048]

[0049] In the formula, ρ is the resistivity of cement slurry, Ω·m; R is the resistance of cement slurry, Ω; L is the vertical length of the conductive sleeve mesh of the resistance sensing device, m; r1 is the outer diameter of the inner metal cylinder, mm; r2 is the outer diameter of the conductive sleeve mesh of the resistance sensing device, mm.

[0050] In other embodiments, the acquisition module 15 can further convert the cement slurry resistance into a rate of change of resistivity using Formula 2 (described below), thereby enabling the determination of the cement slurry flow status by the rate of change of relative resistivity.

[0051] Formula 2:

[0052]

[0053] In the formula, FCR is the rate of change of relative resistivity of cement slurry at any time t, dimensionless; Δρ is the change in resistivity of cement slurry, Ω·cm; ρ0 is the initial resistivity of cement slurry, Ω·cm; ΔR is the change in resistance of cement slurry, Ω; R0 is the initial resistance of cement slurry, Ω; R t Let be the resistance value of the cement grout at any time t, in Ω.

[0054] In this invention, the acquisition module 15 is configured as an AC multimeter. Preferably, the DC resistance measurement during the cement slurry hydration process will produce polarization. Therefore, this device uses an AC multimeter to test the cement slurry resistance, which can more easily weaken or eliminate the influence of polarization, thereby further ensuring the accuracy and effectiveness of experimental data and experimental laws.

[0055] Figure 2 The schematic diagram illustrates the structure of the resistance monitoring mechanism in this invention. Figure 3 This is a top view of the resistance monitoring mechanism in this invention.

[0056] In one embodiment, such as Figures 1-3 As shown, the resistance monitoring mechanism includes a conductive sleeve mesh 21 sleeved outside the first sleeve 11, sleeve buckles 22 disposed on the conductive sleeve mesh 21, and an insulating annular mesh 23 disposed on the end face of the conductive sleeve mesh 21. Preferably, there are two sleeve buckles 22, and the two sleeve buckles 22 are respectively disposed longitudinally at both ends of the conductive sleeve mesh 21, while the insulating annular mesh 23 is sleeved outside the sleeve buckles 22.

[0057] Since the resistance monitoring mechanism is a sleeve accessory for resistance sensing, and the conductive sleeve mesh 21 is connected to the acquisition module 15, it can effectively transmit cement slurry electrical signals after being powered on, which is beneficial for subsequent acquisition of resistivity data and judgment of cement slurry flow status.

[0058] Preferably, the conductive sleeve mesh 21 is typically made of conductive metallic materials such as copper or alloys; while the insulating ring mesh 23 is typically made of insulating materials such as resin or rubber. Therefore, to improve the strength, toughness, wear resistance, and temperature resistance of the insulating ring mesh 23 and the sleeve buckle 22, the raw material weight composition of the insulating ring mesh 23 and the sleeve buckle 22 in this device includes 40%–60% epoxy resin, 25%–35% glass fiber, 5%–15% aromatic amine epoxy resin curing agent, and 7%–15% ceramic.

[0059] In one embodiment, the insulating ring mesh 23 is connected to the conductive sleeve mesh 21 by an adhesive material. Preferably, the adhesive material comprises, by weight, 17%–27% epoxy resin, 55%–60% aromatic amine epoxy resin curing agent, and 15%–25% quaternary ammonium salt accelerator.

[0060] According to the present invention, such as Figure 1 As shown, a valve body 16 is provided on the first sealing cover 13, and the crossflow monitoring mechanism includes an injection module 31 for controlling the flow direction of the crossflow fluid, a flow meter 32 disposed between the injection module 31 and the valve body 16, and a collection module 33 disposed on the second sealing cover 14 for recording crossflow fluid data.

[0061] In this invention, the valve body 16 is configured as an electromagnetically controlled start valve.

[0062] Preferably, the injection module 31 mainly consists of a high-pressure gas cylinder, a pressure reducing valve, a pressure relief valve, a water tank, an oil tank, a check valve, and a liquid injection pump, etc., and can be used to simulate different flow environments such as gas intrusion, water intrusion, and oil intrusion of formation fluids. The collection module 33 mainly consists of a pressure gauge, a high-precision flow meter, a high-precision electronic balance, a gas-liquid separator, a gas collector, a liquid collector, and valves, etc., and can be used to monitor the outflow rate of the flowing fluid.

[0063] In one embodiment of the present invention, such as Figure 1 As shown, a first sensor 17 is provided on the second sleeve 12, extending into the annular space 101. Preferably, the first sensor 17 is configured as a pressure sensor, which can be used to monitor pressure changes in the cement slurry column.

[0064] According to the present invention, such as Figure 1 As shown, the monitoring device 100 for monitoring the hydration process of cement slurry and formation flow further includes a temperature control mechanism. Preferably, the temperature control mechanism includes a second sensor 41 and a heater 44 spaced apart within the first sleeve 11 for recording temperature changes, a condensate pipe 42 wound around the second sensor 41, and a temperature controller 43 disposed outside the second sleeve 12 and connected to the second sensor 41. Preferably, the temperature control mechanism is capable of simulating the downhole formation temperature environment.

[0065] In one embodiment, such as Figure 1 As shown, the monitoring device 100 for the cement slurry hydration process and formation flow also includes a pressure control module 19 that is internally connected to the first sleeve 11. Preferably, the pressure control module 19 mainly includes a pressure sensor, an automatic pressure tracking pump, an electromagnetically controlled pneumatic valve, an air compressor, and a water source, which can be used to simulate the downhole formation pressure environment.

[0066] In one embodiment of the present invention, such as Figure 1As shown, the monitoring device 100 for the cement slurry hydration process and formation flow also includes a data acquisition unit 18 connected to the acquisition module 15, the collection module 33, and the temperature controller 43. Preferably, the data acquisition unit 18 can control formation pressure, formation temperature, formation fluid flow initiation conditions (one being curing time, and the other being cement slurry column pressure and its fluctuation threshold), formation fluid type, formation fluid flow pressure, formation fluid flow rate, data acquisition interval, etc., through a program, and transmit the monitored cement slurry resistance, flow rate of the flowing fluid, cement slurry column pressure, formation pressure, formation temperature, etc., to the data acquisition system.

[0067] In this invention, the cementing construction parameters mainly include formation pressure, formation temperature, crossflow pressure, formation water salinity, and cement slurry thickening time.

[0068] In this invention, it is first necessary to... Figure 1 The monitoring device is installed as shown. Then, according to the formation conditions, the cross-flow fluid is prepared and injected into the cross-flow fluid injection system. After that, according to the cementing operation conditions, cement slurry is prepared and injected into the cement slurry injection annulus. After the sealing cap is sealed tightly with bolts, the formation pressure, formation temperature, formation fluid cross-flow opening conditions, formation fluid type, formation fluid cross-flow pressure or flow rate, data acquisition interval, etc. are set to obtain data to determine the cement slurry and cross-flow status.

[0069] According to a second aspect of the present invention, a monitoring method is provided, which utilizes a monitoring device according to the above description, comprising the following steps:

[0070] First, cement slurry is poured into the annular space 101 between the first sleeve 11 and the second sleeve 12, and then sealed by the first sealing cap 13 and the second sealing cap 14.

[0071] Then, based on the cementing construction parameters, set the formation pressure, formation temperature, formation fluid crossflow activation conditions, formation crossflow fluid related values ​​(such as fluid type, crossflow pressure, crossflow flow rate), data acquisition interval, etc.

[0072] Subsequently, data such as the resistance of the cement slurry and the pressure of the liquid column were tested using module 15, and the real-time resistivity or relative resistivity change rate of the cement slurry was calculated according to formulas 1 and 2.

[0073] Finally, the resistivity or resistivity change rate fluctuation is used to characterize and evaluate the cement slurry cross-flow state, providing reference and guidance for the research and development of anti-cross-flow cement slurry systems and the study of cement ring sealing integrity.

[0074] Example 1

[0075] The cement slurry was prepared with the following formula: 100 parts Jiahua G-grade cement, 44 parts water, and 0.3 parts defoamer, with a density of 1.88 g / cm³. 3 Cement grout is poured into the cement grout injection ring, and the upper sealing cap is then sealed tightly with bolts.

[0076] In this embodiment, the formation pressure is set to 35 MPa, the formation temperature to 60°C, the formation fluid crossflow activation conditions are: the cement slurry column pressure drops to 9 kPa, its fluctuation threshold is 0.3 kPa, the formation crossflow fluid is N2 (nitrogen), the formation fluid crossflow pressure is 12 kPa, and the data acquisition interval is 0.1 s.

[0077] The cement slurry resistance data is acquired by the acquisition module 15, and then the resistivity and resistivity change rate are calculated according to Formula 1 and Formula 2 respectively. The final data results are as follows. Figure 4 , Figure 5 As shown, the resistivity of the cement slurry decreased by 2.59 kΩ·m; the rate of change of relative resistivity decreased by 0.27.

[0078] It is worth noting that the gentle areas in the attached diagram represent the cement slurry hydration process, while the abrupt change areas represent the state of formation flow.

[0079] Example 2

[0080] The cement slurry was prepared with the following formula: 100 parts Jiahua G-grade cement, 44 parts water, and 0.3 parts defoamer, with a density of 1.88 g / cm³. 3 Cement grout is poured into the cement grout injection ring, and the upper sealing cap is then sealed tightly with bolts.

[0081] In this embodiment, the formation pressure is set to 35 MPa, the formation temperature to 60°C, the formation fluid crossflow activation conditions are: the cement slurry column pressure drops to 12.5 kPa, its fluctuation threshold is 0.3 kPa, the formation crossflow fluid is water, the formation fluid crossflow flow rate is 20 mL, and the data acquisition interval is 0.1 s.

[0082] Cement slurry resistance data is acquired through acquisition module 15, and then resistivity and resistivity change rate are calculated according to formulas 1 and 2 respectively. The results are as follows. Figure 6 , Figure 7 As shown, the resistivity of the cement slurry decreased by 8.99 kΩ·m; the rate of change of relative resistivity decreased by 1.48.

[0083] It is worth noting that the gentle areas in the attached diagram represent the cement slurry hydration process, while the abrupt change areas represent the state of formation flow.

[0084] Compared with existing technologies, the advantages of this invention are:

[0085] Firstly, this invention can accurately monitor the hydration process and flow state of cement slurry by acquiring electrical signals of the cement slurry.

[0086] Specifically, this device not only includes a flow monitoring mechanism to accurately simulate the activation conditions of formation fluid flow, but also a resistance monitoring mechanism to acquire cement slurry resistance data through the acquisition module 15. Then, resistivity and resistivity change rate are calculated according to Formula 1 and Formula 2, respectively. Thus, the fluctuation of resistivity or resistivity change rate can be used to characterize and evaluate the cement slurry flow state, providing reference and guidance for the research and development of anti-flow cement slurry system and the study of cement ring sealing integrity.

[0087] Secondly, this invention can provide a simulated environment for the cement slurry hydration process and formation flow, thereby ensuring the integrity and firmness of the cement sheath seal, further ensuring the accuracy and authenticity of the cement slurry hydration process and flow information, and thus ensuring that the experimental data and experimental laws obtained in the simulation work can provide good guidance for downhole operations.

[0088] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Those skilled in the art can easily make changes or modifications within the scope of the present invention, and such changes or modifications should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A monitoring device for the hydration process of cement slurry and formation flow in well cementing, comprising: The main structure includes a first sleeve (11), a second sleeve (12) fitted outside the first sleeve (11) for containing cement slurry, and a first sealing cap (13) and a second sealing cap (14) for sealing the annular space (101) between the first sleeve (11) and the second sleeve (12). A resistance monitoring mechanism is installed on the first sleeve (11), and A flow monitoring mechanism for injecting cross-flow fluid into the annulus (101), The second sleeve (12) is provided with a data acquisition module (15) that is connected to the first sleeve (11) and the resistance monitoring mechanism respectively and is used to record the resistance of cement slurry. The data acquisition module (15) is configured to calculate the resistivity by formula, so that the cement slurry flow status can be judged by observing the change in resistivity.

2. The monitoring device for the hydration process of cement slurry and formation flow according to claim 1, characterized in that, The resistance monitoring mechanism includes a conductive sleeve mesh (21) sleeved outside the first sleeve (11), sleeve buckles (22) disposed on both sides of the conductive sleeve mesh (21), and an insulating ring mesh (23) disposed on the end face of the conductive sleeve mesh (21).

3. The monitoring device for the hydration process of cement slurry and formation flow according to claim 2, characterized in that, The raw material weight composition of the sleeve buckle (22) and the insulating ring mesh (23) includes 40% to 60% epoxy resin, 25% to 35% glass fiber, 5% to 15% aromatic amine epoxy resin curing agent, and 7% to 15% ceramic.

4. The monitoring device for the hydration process of cement slurry and formation flow according to claim 3, characterized in that, The insulating ring mesh (23) is connected to the conductive sleeve mesh (21) by an adhesive material.

5. The monitoring device for the hydration process of cement slurry and formation flow according to claim 4, characterized in that, The raw material weight composition of the adhesive material includes 17% to 27% epoxy resin, 55% to 60% aromatic amine epoxy resin curing agent, and 15% to 25% quaternary ammonium salt accelerator.

6. The monitoring device for the hydration process of cement slurry and formation flow according to any one of claims 1 to 5, characterized in that, A valve body (16) is provided on the first sealing cover (13). The crossflow monitoring mechanism includes an injection module (31) for controlling the flow direction of the crossflow fluid, a flow meter (32) disposed between the injection module (31) and the valve body (16), and a collection module (33) disposed on the second sealing cover (14) for recording crossflow fluid data.

7. The monitoring device for the hydration process of cement slurry and formation flow according to any one of claims 1 to 5, characterized in that, A first sensor (17) is provided on the second sleeve (12) to extend into the annulus (101) and to record pressure changes.

8. The monitoring device for the hydration process of cement slurry and formation flow according to claim 6, characterized in that, The monitoring device further includes a temperature control mechanism, which includes a second sensor (41) and a heater (44) spaced apart inside the first sleeve (11), a condensate pipe (42) wrapped around the second sensor (41), and a temperature controller (43) disposed outside the second sleeve (12) and connected to the second sensor (41).

9. The monitoring device for the hydration process of cement slurry and formation flow according to claim 8, characterized in that, The monitoring device also includes a data acquisition unit (18) connected to the acquisition module (15), the collection module (33) and the temperature controller (43) respectively.

10. A monitoring method utilizing the monitoring device according to any one of claims 1 to 9, comprising the following steps: S1. Cement slurry is poured into the annular cavity (101) and sealed by the first sealing cap (13) and the second sealing cap (14); S2. Set the formation pressure, formation temperature, formation fluid crossflow activation conditions and data acquisition interval; S3. The data acquisition unit (18) acquires the cement slurry resistance data and calculates the resistivity according to the formula, so that the cement slurry flow status can be judged by observing the change in resistivity.

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