Device and method for testing cement setting process at high temperature and high pressure

Abstract

The invention discloses a cement setting process testing device and method under high temperature and high pressure, and belongs to the technical field of cement setting time test.The cement setting process testing device comprises a temperature sensor, a data acquisition processor, a water bath kettle body and a high-temperature and high-pressure autoclave body, a heating pipe is fixed to the inner bottom wall of the water bath kettle body, and a kettle cover is arranged on the high-temperature and high-pressure autoclave body; a cement paste cup is arranged in the high-temperature and high-pressure kettle body, a kettle cover is provided with a temperature sensor, the temperature sensor is connected with a data acquisition processor, the high-temperature and high-pressure kettle body is provided with a pressure sensor, the pressure sensor is connected with the data acquisition processor, the high-temperature and high-pressure kettle body is provided with a high-pressure pipeline, and the high-pressure pipeline is provided with a pressure release valve. And the high-pressure pipeline is connected with a hand-operated metering pump. The cement paste setting process is measured by testing the change of temperature and pressure, the initial setting time and the final setting time of cement under high-temperature and high-pressure conditions can be accurately detected, and the detection is simple and convenient.

Description

Technical Field

[0001] This invention relates to the field of cement setting time testing technology, and in particular to a device and method for testing the cement setting process under high temperature and high pressure. Background Technology

[0002] In cementing operations, the initial setting time must be sufficiently long to ensure the cement slurry remains fluid during pumping, smoothly passes through the annulus between the casing and the wellbore, and fully fills the voids around the wellbore to form an effective sealing layer. If the initial setting time is too short, the cement slurry may solidify before reaching the intended location, resulting in ineffective sealing of the oil and gas layer or failure to achieve the expected solidification quality, thus affecting well safety and production efficiency. The final setting time must ensure that the cement slurry solidifies rapidly after reaching the target depth to form a stable support structure, while avoiding premature solidification that would prevent the effective discharge of subsequent displacement fluid, leading to under-displacement or unconsolidated bottom. Therefore, accurate measurement of the initial and final setting times of the cement slurry under high temperature and pressure is necessary.

[0003] Chinese patent document CN203203990U, published on September 18, 2013, discloses a testing device for cement setting time under high temperature conditions. The device includes a heating container, heating elements, a water circulation port, a protective sleeve, a Vicat apparatus, a temperature controller, a water level overflow port, temperature sensors, and a testing platform. The testing platform is located inside the heating container, with the Vicat apparatus positioned next to it. A protective sleeve is placed on the testing platform. The axis of the Vicat apparatus's setting probe is perpendicular to the testing platform. Several water circulation ports are located on the lower inner wall of the heating container, and a water level overflow port is located on the upper inner wall. Several heating elements are located below the water circulation ports, and several temperature sensors are located above them. The heating elements and temperature sensors are fixed to the inner wall of the heating container and connected to the temperature controller via wires.

[0004] The patent document discloses a testing device for cement setting time under high-temperature conditions, which features precise temperature control, simple operation, accurate test results, and low cost. Furthermore, the nominal diameter of the upper sleeve's internal thread is equal to that of the lower sleeve's internal thread, ensuring proper alignment between the middle sleeve and the upper and lower sleeves when the cement slurry specimen is flipped. Simultaneously, a gasket inside the lower sleeve ensures that the lower sleeve is not damaged by the cement slurry specimen during disassembly and reassembly. However, because the setting process of the cement slurry is measured using the traditional Vicat apparatus method, testing under high-pressure conditions is not possible, and accurate detection of the initial and final setting times of cement under high temperature and high pressure conditions is not possible. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, the present invention provides a testing device and method for cement setting process under high temperature and high pressure. The present invention measures the cement slurry setting process by testing the changes in temperature and pressure, and can accurately detect the initial setting time and final setting time of cement under high temperature and high pressure conditions. The detection is simple and convenient.

[0006] This invention is achieved through the following technical solution: A testing device for cement setting process under high temperature and high pressure includes a temperature sensor and a data acquisition processor. The device further includes a water bath and a high-temperature and high-pressure vessel. The high-temperature and high-pressure vessel is fixed inside the water bath. A heating pipe is installed between the water bath and the high-temperature and high-pressure vessel, and the heating pipe is fixed to the inner bottom wall of the water bath. A lid is installed on the high-temperature and high-pressure vessel. A cement slurry cup is installed inside the high-temperature and high-pressure vessel. A temperature sensor is installed on the lid, with one end extending into the cement slurry cup and the other end connected to the data acquisition processor via a data transmission line. A pressure sensor is installed on the high-temperature and high-pressure vessel, with one end extending into the high-temperature and high-pressure vessel and the other end connected to the data acquisition processor via a data transmission line. A high-pressure pipeline is installed on the high-temperature and high-pressure vessel, with a pressure relief valve installed on the pipeline. One end of the high-pressure pipeline extends into the high-temperature and high-pressure vessel, and the other end is connected to a hand-cranked metering pump.

[0007] The cement slurry cup includes a cup body and a lower end cap, which are detachably connected.

[0008] The lid of the vessel has a threaded through hole.

[0009] The size of the threaded through hole is adapted to the size of the temperature sensor.

[0010] The threaded through hole is located at the center of the kettle lid.

[0011] The cross-section of the vessel lid is an inverted trapezoidal shape.

[0012] There is an annular space gap between the high-temperature and high-pressure reactor body and the cement slurry cup.

[0013] A method for testing the cement setting process under high temperature and high pressure, characterized by comprising the following steps: S1. Apply release agent evenly to the inner wall and lower end cap of the cement slurry cup; S2. Pour the preheated cement slurry into the cement slurry cup and then place the cement slurry cup into the high-temperature and high-pressure autoclave. S3. Add water through the annular space between the high-temperature and high-pressure reactor and the cement slurry cup; S4. Open the pressure relief valve, install the lid of the high-temperature and high-pressure reactor, tighten the lid, and let the excess water flow out from the pressure relief valve and into the water bath reactor. S5. Insert the temperature sensor into the lid and tighten the nut of the temperature sensor to seal the high-temperature and high-pressure vessel. S6. A hand-cranked metering pump is used to pressurize the high-temperature and high-pressure autoclave and heat the cement slurry to 70°C. The data is recorded and processed by a data acquisition processor.

[0014] In step S6, a hand-cranked metering pump is used to pressurize the high-temperature and high-pressure reactor to a pressure of 40-50 MPa.

[0015] In step S1, the release agent is a sealant.

[0016] The beneficial effects of this invention are mainly reflected in the following aspects: 1. Compared with the prior art, the present invention measures the cement slurry setting process by testing the changes in temperature and pressure, which can accurately detect the initial setting time and final setting time of cement under high temperature and high pressure conditions, and the detection is simple and convenient.

[0017] 2. The present invention provides a cement slurry cup comprising a cup body and a lower end cap, wherein the cup body and the lower end cap are detachably connected, facilitating the demolding of cement stone and the disassembly of the mold after the test.

[0018] 3. This invention has a reliable testing principle, is easy to operate, and has a wide range of applications. It solves the engineering problem of inaccurate measurement of the cement slurry setting process and can be used as a basis for experimental design, evaluation, and optimization of the initial and final setting times of cement slurry in oil and gas wells. It has broad application prospects.

[0019] 4. This invention can more realistically and effectively reflect the cement setting process under high temperature and high pressure, and has the characteristics of simple operation and strong applicability.

[0020] 5. This invention is applicable to the testing of cement slurry setting process under high temperature and high pressure in oil and gas well cementing. The cement slurry setting process can be accurately measured by testing the changes in temperature and pressure, making the measurement more convenient.

[0021] 6. This invention can calculate the initial setting time and final setting time of cement by using the temperature and pressure collected by the data acquisition processor, which greatly improves the detection efficiency. Attached Figure Description

[0022] The present invention will now be further described in detail with reference to the accompanying drawings and specific embodiments, wherein: Figure 1 This is a schematic diagram of the structure of the testing device of the present invention; Figure 2 This is a schematic diagram of the structure of the cement slurry cup of the present invention; Figure 3 The test curve of the present invention pressurized to 40MPa; Figure 4The test curve of the present invention when pressurized to 50MPa; The following are labeled in the diagram: 1. Water bath body, 2. Heating tube, 3. High temperature and high pressure vessel body, 4. Cement slurry cup, 5. Lower end cover, 6. Temperature sensor, 7. High pressure pipeline, 8. Pressure relief valve, 9. Hand-cranked metering pump, 10. Vessel cover, 11. Data acquisition processor, 12. Pressure sensor. Detailed Implementation

[0023] Example 1 See Figure 1 A testing device for cement setting process under high temperature and high pressure includes a temperature sensor 6, a data acquisition processor 11, a water bath 1, and a high temperature and high pressure vessel 3. The high temperature and high pressure vessel 3 is fixed inside the water bath 1. A heating pipe 2 is arranged between the water bath 1 and the high temperature and high pressure vessel 3, and the heating pipe 2 is fixed to the inner bottom wall of the water bath 1. A lid 10 is provided on the high temperature and high pressure vessel 3. A cement slurry cup 4 is provided inside the high temperature and high pressure vessel 3. The temperature sensor 6 is provided on the lid 10, and one end of the temperature sensor 6 extends into the cement slurry. Inside the cup 4, the other end of the temperature sensor 6 is connected to the data acquisition processor 11 via a data transmission line. A pressure sensor 12 is installed on the high-temperature and high-pressure vessel 3. One end of the pressure sensor 12 extends into the high-temperature and high-pressure vessel 3, and the other end of the pressure sensor 12 is connected to the data acquisition processor 11 via a data transmission line. A high-pressure pipeline 7 is installed on the high-pressure pipeline 3, and a pressure relief valve 8 is installed on the high-pressure pipeline 7. One end of the high-pressure pipeline 7 extends into the high-temperature and high-pressure vessel 3, and the other end of the high-pressure pipeline 7 is connected to a hand-cranked metering pump 9.

[0024] This embodiment is the most basic implementation method. Compared with the prior art, by measuring the cement slurry setting process by testing the changes in temperature and pressure, it is possible to accurately detect the initial setting time and final setting time of cement under high temperature and high pressure conditions, and the detection is simple and convenient.

[0025] Example 2 See Figure 1 and Figure 2A testing device for cement setting process under high temperature and high pressure includes a temperature sensor 6, a data acquisition processor 11, a water bath 1, and a high temperature and high pressure vessel 3. The high temperature and high pressure vessel 3 is fixed inside the water bath 1. A heating pipe 2 is arranged between the water bath 1 and the high temperature and high pressure vessel 3, and the heating pipe 2 is fixed to the inner bottom wall of the water bath 1. A lid 10 is provided on the high temperature and high pressure vessel 3. A cement slurry cup 4 is provided inside the high temperature and high pressure vessel 3. The temperature sensor 6 is provided on the lid 10, and one end of the temperature sensor 6 extends into the cement slurry. Inside the cup 4, the other end of the temperature sensor 6 is connected to the data acquisition processor 11 via a data transmission line. A pressure sensor 12 is installed on the high-temperature and high-pressure vessel 3. One end of the pressure sensor 12 extends into the high-temperature and high-pressure vessel 3, and the other end of the pressure sensor 12 is connected to the data acquisition processor 11 via a data transmission line. A high-pressure pipeline 7 is installed on the high-pressure pipeline 3, and a pressure relief valve 8 is installed on the high-pressure pipeline 7. One end of the high-pressure pipeline 7 extends into the high-temperature and high-pressure vessel 3, and the other end of the high-pressure pipeline 7 is connected to a hand-cranked metering pump 9.

[0026] The cement slurry cup 4 includes a cup body and a lower end cap 5, which are detachably connected.

[0027] This embodiment is a preferred implementation. The cement slurry cup 4 includes a cup body and a lower end cap 5. The cup body and the lower end cap 5 are detachably connected, which facilitates the demolding of cement stone and the disassembly of the mold after the test.

[0028] Example 3 See Figure 1 and Figure 2 A testing device for cement setting process under high temperature and high pressure includes a temperature sensor 6, a data acquisition processor 11, a water bath 1, and a high temperature and high pressure vessel 3. The high temperature and high pressure vessel 3 is fixed inside the water bath 1. A heating pipe 2 is arranged between the water bath 1 and the high temperature and high pressure vessel 3, and the heating pipe 2 is fixed to the inner bottom wall of the water bath 1. A lid 10 is provided on the high temperature and high pressure vessel 3. A cement slurry cup 4 is provided inside the high temperature and high pressure vessel 3. The temperature sensor 6 is provided on the lid 10, and one end of the temperature sensor 6 extends into the cement slurry. Inside the cup 4, the other end of the temperature sensor 6 is connected to the data acquisition processor 11 via a data transmission line. A pressure sensor 12 is installed on the high-temperature and high-pressure vessel 3. One end of the pressure sensor 12 extends into the high-temperature and high-pressure vessel 3, and the other end of the pressure sensor 12 is connected to the data acquisition processor 11 via a data transmission line. A high-pressure pipeline 7 is installed on the high-pressure pipeline 3, and a pressure relief valve 8 is installed on the high-pressure pipeline 7. One end of the high-pressure pipeline 7 extends into the high-temperature and high-pressure vessel 3, and the other end of the high-pressure pipeline 7 is connected to a hand-cranked metering pump 9.

[0029] The cement slurry cup 4 includes a cup body and a lower end cap 5, which are detachably connected.

[0030] The lid 10 has a threaded through hole.

[0031] The size of the threaded through hole is adapted to the size of the temperature sensor 6.

[0032] The threaded through hole is located at the center of the vessel cover 10.

[0033] The cross-section of the lid 10 is an inverted trapezoidal shape.

[0034] This embodiment is another preferred implementation method. The entire test principle is reliable, the operation is simple, and the application range is wide. It solves the engineering problem of inaccurate measurement of the cement slurry setting process. It can be used as a basis for experimental design, evaluation and optimization of the initial setting time and final setting time of cement slurry in oil and gas wells, and has broad application prospects.

[0035] Example 4 See Figure 1 and Figure 2 A testing device for cement setting process under high temperature and high pressure includes a temperature sensor 6, a data acquisition processor 11, a water bath 1, and a high temperature and high pressure vessel 3. The high temperature and high pressure vessel 3 is fixed inside the water bath 1. A heating pipe 2 is arranged between the water bath 1 and the high temperature and high pressure vessel 3, and the heating pipe 2 is fixed to the inner bottom wall of the water bath 1. A lid 10 is provided on the high temperature and high pressure vessel 3. A cement slurry cup 4 is provided inside the high temperature and high pressure vessel 3. The temperature sensor 6 is provided on the lid 10, and one end of the temperature sensor 6 extends into the cement slurry. Inside the cup 4, the other end of the temperature sensor 6 is connected to the data acquisition processor 11 via a data transmission line. A pressure sensor 12 is installed on the high-temperature and high-pressure vessel 3. One end of the pressure sensor 12 extends into the high-temperature and high-pressure vessel 3, and the other end of the pressure sensor 12 is connected to the data acquisition processor 11 via a data transmission line. A high-pressure pipeline 7 is installed on the high-pressure pipeline 3, and a pressure relief valve 8 is installed on the high-pressure pipeline 7. One end of the high-pressure pipeline 7 extends into the high-temperature and high-pressure vessel 3, and the other end of the high-pressure pipeline 7 is connected to a hand-cranked metering pump 9.

[0036] The cement slurry cup 4 includes a cup body and a lower end cap 5, which are detachably connected.

[0037] The lid 10 has a threaded through hole.

[0038] The size of the threaded through hole is adapted to the size of the temperature sensor 6.

[0039] The threaded through hole is located at the center of the vessel cover 10.

[0040] The cross-section of the lid 10 is an inverted trapezoidal shape.

[0041] There is an annular space gap between the high-temperature and high-pressure autoclave 3 and the cement slurry cup 4.

[0042] This embodiment is another preferred implementation method, which can more realistically and effectively reflect the cement setting process under high temperature and high pressure, and has the characteristics of simple operation and strong applicability.

[0043] Example 5 See Figure 1 and Figure 2 A method for testing the cement setting process under high temperature and high pressure includes the following steps: S1. Apply release agent evenly to the inner wall of cement grout cup 4 and the lower end cap 5; S2. Pour the preheated cement slurry into the cement slurry cup 4, and then place the cement slurry cup 4 into the high temperature and high pressure autoclave 3. S3. Add water through the annular space between the high-temperature and high-pressure autoclave 3 and the cement slurry cup 4; S4. Open the pressure relief valve 8, install the lid 10 of the high temperature and high pressure vessel 3, tighten the lid 10, and let the excess water flow out from the pressure relief valve 8 and into the water bath vessel 1. S5. Insert the temperature sensor 6 into the lid 10 and tighten the nut of the temperature sensor 6 to seal the high-temperature and high-pressure vessel body 3. S6. A hand-cranked metering pump 9 is used to pressurize the high-temperature and high-pressure autoclave 3 and heat the cement slurry to 70°C. The data is then recorded and processed by the data acquisition processor 11.

[0044] In step S1, the release agent is a sealant.

[0045] In step S6, a hand-cranked metering pump 9 is used to pressurize the high-temperature and high-pressure vessel 3 to a pressure of 40 MPa.

[0046] This embodiment is another preferred implementation method, which is suitable for testing the cement slurry setting process under high temperature and high pressure in oil and gas well cementing. The cement slurry setting process can be accurately measured by testing the changes in temperature and pressure, making the measurement simpler.

[0047] Example 6 See Figure 1 and Figure 2 A method for testing the cement setting process under high temperature and high pressure includes the following steps: S1. Apply release agent evenly to the inner wall of cement grout cup 4 and the lower end cap 5; S2. Pour the preheated cement slurry into the cement slurry cup 4, and then place the cement slurry cup 4 into the high temperature and high pressure autoclave 3. S3. Add water through the annular space between the high-temperature and high-pressure reactor body 3 and the cement slurry cup 4; S4. Open the pressure relief valve 8, install the lid 10 of the high temperature and high pressure vessel 3, tighten the lid 10, and let the excess water flow out from the pressure relief valve 8 and into the water bath vessel 1. S5. Insert the temperature sensor 6 into the lid 10 and tighten the nut of the temperature sensor 6 to seal the high-temperature and high-pressure vessel body 3. S6. A hand-cranked metering pump 9 is used to pressurize the high-temperature and high-pressure autoclave 3 and heat the cement slurry to 70°C. The data is then recorded and processed by the data acquisition processor 11.

[0048] In step S1, the release agent is a sealant.

[0049] In step S6, a hand-cranked metering pump 9 is used to pressurize the high-temperature and high-pressure vessel 3 to a pressure of 50 MPa.

[0050] This embodiment is the best implementation method. The initial setting time and final setting time of cement can be calculated using the temperature and pressure collected by the data acquisition processor 11, which greatly improves the detection efficiency.

[0051] The invention will now be illustrated with specific examples: The inner diameter of the high-temperature and high-pressure reactor body 3 is 56mm, and the height from the reactor cover 10 is 270mm; the inner diameter of the cement slurry cup 4 is 50mm, the outer diameter is 53mm, and the height is 260mm.

[0052] Before assembling the testing apparatus, following the method in "5.5.3 Preparation of Test Mold" of GB / T19139-2012 "Test Methods for Cement in Oil Wells", a thin layer of sealant should be evenly applied to the inner wall of the cement slurry cup 4 and the lower end cap 5. This is for sealing the end face of the cementitious board and facilitating the demolding of the cement stone and disassembly of the mold after the test. The sealant used during the assembly of the testing apparatus should be selected according to the requirements of "7.4.7 Sealing Grease for Test Molds" of GB / T19139-2012 "Test Methods for Cement in Oil Wells", and the sealant should be applied thinly and evenly.

[0053] To verify the universal applicability of the testing device and the reliability of the testing method of this invention, referring to the method in "5 Preparation of Cement Slurry" of GB / T19139-2012 "Test Methods for Cement in Oil Wells", three different cement slurry systems were prepared with expansion agent dosages of 0%, 1%, and 2% of the cement weight, respectively, with a designed density of 1.90 g / cm³. 3 .

[0054] Referring to the method of "10 Static Filtration Test of Cement Slurry" in GB / T19139-2012 "Test Methods for Cement in Oil Wells", cement and water were mixed and pre-mixed in an atmospheric pressure thickener for 30 minutes.

[0055] Referring to GB / T19139-2012 "Test Methods for Cement in Oil Wells", the pre-prepared cement slurry was filled into the cement slurry cup 4 of the testing device of this invention, and the cement slurry cup 4 was placed inside the high-temperature and high-pressure reactor 3. Water was added through the annular gap between the high-temperature and high-pressure reactor 3 and the cement slurry cup 4. The pressure relief valve 8 was opened, and the reactor lid 10 of the high-temperature and high-pressure reactor 3 was installed. The reactor lid 10 of the high-temperature and high-pressure reactor 3 was tightened, allowing excess water to flow out from the pressure relief valve 8 and into the water bath reactor 1. The temperature sensor 6 was inserted, and the nut of the temperature sensor 6 was tightened to seal the high-temperature and high-pressure reactor 3. The pressure was increased to 40 MPa by hand-cranked metering pump 9, and the cement slurry was heated to 70°C. The data acquisition processor 11 was turned on to record and process the data. The test and calculation results are as follows: Figure 3 After cleaning the testing equipment, repeat the above experiment, pressurize to 50 MPa, heat the cement slurry to 70°C, and turn on the data acquisition processor 11 to record and process the data. See [link to test and calculation results]. Figure 4 .

[0056] from Figure 3 and Figure 4 It can be seen that after the cement slurry is heated to the target temperature, heating is stopped. As the cement hydrates, the temperature of the cement slurry gradually rises to its peak; this is the initial setting time. As the hydration rate of the cement slurry slows down and the heat release decreases until the temperature of the cement slurry stabilizes, this is the final setting time. Figure 3 and Figure 4 The experimental results show that the present invention has good applicability and reliability.

Claims

1. A testing device for cement setting process under high temperature and high pressure, comprising a temperature sensor (6) and a data acquisition processor (11), characterized in that: It also includes a water bath vessel (1) and a high-temperature and high-pressure vessel (3). The high-temperature and high-pressure vessel (3) is fixed inside the water bath vessel (1). A heating pipe (2) is provided between the water bath vessel (1) and the high-temperature and high-pressure vessel (3). The heating pipe (2) is fixed on the inner bottom wall of the water bath vessel (1). A lid (10) is provided on the high-temperature and high-pressure vessel (3). A cement slurry cup (4) is provided inside the high-temperature and high-pressure vessel (3). A temperature sensor (6) is provided on the lid (10). One end of the temperature sensor (6) extends into the cement slurry cup (4), and the other end of the temperature sensor (6) extends into the cement slurry cup (4). The high-temperature and high-pressure vessel (3) is connected to the data acquisition processor (11) via a data transmission line. A pressure sensor (12) is installed on the high-temperature and high-pressure vessel (3). One end of the pressure sensor (12) extends into the high-temperature and high-pressure vessel (3), and the other end of the pressure sensor (12) is connected to the data acquisition processor (11) via a data transmission line. A high-pressure pipeline (7) is installed on the high-pressure pipeline (7), and a pressure relief valve (8) is installed on the high-pressure pipeline (7). One end of the high-pressure pipeline (7) extends into the high-temperature and high-pressure vessel (3), and the other end of the high-pressure pipeline (7) is connected to a hand-cranked metering pump (9).

2. The testing device for cement setting process under high temperature and high pressure according to claim 1, characterized in that: The cement slurry cup (4) includes a cup body and a lower end cap (5), which are detachably connected.

3. The testing device for cement setting process under high temperature and high pressure according to claim 1, characterized in that: The lid (10) has a threaded through hole.

4. The testing device for cement setting process under high temperature and high pressure according to claim 3, characterized in that: The size of the threaded through hole is adapted to the size of the temperature sensor (6).

5. The testing device for cement setting process under high temperature and high pressure according to claim 3, characterized in that: The threaded through hole is located at the center of the lid (10).

6. The testing device for cement setting process under high temperature and high pressure according to claim 1, characterized in that: The cross-section of the lid (10) is an inverted trapezoidal shape.

7. The testing device for cement setting process under high temperature and high pressure according to claim 1, characterized in that: There is an annular space gap between the high-temperature and high-pressure autoclave (3) and the cement slurry cup (4).

8. A method for testing the cement setting process under high temperature and high pressure, characterized in that, Includes the following steps: S1. Apply release agent evenly to the inner wall of the cement slurry cup (4) and the lower end cap (5); S2. Pour the preheated cement slurry into the cement slurry cup (4) and then place the cement slurry cup (4) into the high temperature and high pressure autoclave (3); S3. Add water through the annular space between the high-temperature and high-pressure autoclave (3) and the cement slurry cup (4); S4. Open the pressure relief valve (8), install the lid (10) of the high temperature and high pressure vessel body (3), tighten the lid (10), and let the excess water flow out from the pressure relief valve (8) and into the water bath vessel body (1); S5. Insert the temperature sensor (6) into the lid (10) and tighten the nut of the temperature sensor (6) to seal the high temperature and high pressure vessel body (3). S6. A hand-cranked metering pump (9) is used to pressurize the high-temperature and high-pressure autoclave (3) and heat the cement slurry to 70°C. The data is then recorded by a data acquisition processor (11).

9. The method for testing the cement setting process under high temperature and high pressure according to claim 8, characterized in that: In step S6, a hand-cranked metering pump (9) is used to pressurize the high-temperature and high-pressure vessel (3) to a pressure of 40-50 MPa.

10. The method for testing the cement setting process under high temperature and high pressure according to claim 8, characterized in that: In step S1, the release agent is a sealant.

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