Device and method for testing volume change rate of cement paste

Abstract

The invention provides a cement paste volume change rate testing device and a testing method thereof. The cement paste volume change rate testing device comprises a cement paste cup, a first kettle body, a kettle cover, a second kettle body and a heater. The kettle cover and the first kettle body are connected to form a containing cavity, and the cement paste cup is arranged in the containing cavity. The first kettle body is arranged in the second kettle body, a first gap is formed between the second kettle body and the first kettle body, and a liquid heat transfer medium is arranged in the first gap. The heater is arranged in the first gap and located in the liquid heat transfer medium. The volume expansion and contraction tester solves the problem that a heating coil is inconvenient to arrange in an existing volume expansion and contraction tester.

Description

Technical Field

[0001] This application relates to the technical field of experimental equipment for oil and gas exploration, and in particular to a cement slurry volume change rate testing device and its testing method. Background Technology

[0002] Cement slurry hardens and solidifies under high temperature and pressure in the formation to form a cement sheath. The hardened cement sheath serves to support the wellbore, protect the casing, and seal off oil, gas, and water layers. The sealing integrity of the cement sheath is crucial for safe oil and gas production. During the hardening process, the consumption of water and the hydration of cement particles cause the cement slurry to shrink in volume. This shrinkage can lead to channeling, compromising the sealing integrity and causing problems such as interlayer channeling and annular pressure.

[0003] An expansion agent is added to prevent cement from shrinking. If the expansion agent does not expand sufficiently, it will not achieve the desired seal; however, excessive expansion may damage the sleeve. To determine the appropriate dosage of expansion agent, an expansion and shrinkage tester can be used.

[0004] Chinese patent CN214374431U discloses a volumetric expansion and contraction tester for oil well cement under high temperature and high pressure conditions. The tester includes a test vessel, a cement slurry cup, a high-temperature pressure gauge, and a pressurization system. A curing chamber is installed within the test vessel. The cement slurry cup is placed inside the curing chamber. A heating coil is installed within the test vessel. The pressurization system pressurizes the curing chamber, and the heating coil heats the vessel. The pressure in the curing chamber is then measured using the high-temperature pressure gauge. Based on the constant total gas volume and the pressure changes during the test, the shrinkage / expansion rate of the cement paste can be calculated.

[0005] Setting up a space within the vessel body to house the heating coil is quite challenging. Even if a space is carved out for the heating coil, it's inconvenient to fit it inside. Therefore, existing volume expansion and contraction testers suffer from the problem of inconveniently placing the heating coil. Summary of the Invention

[0006] The purpose of this application is to provide a cement slurry volume change rate testing device with a convenient heater, comprising a cement slurry cup, a first vessel body, a vessel lid, a second vessel body, and a heater. The vessel lid and the first vessel body are connected to form a receiving cavity, and the cement slurry cup is disposed within the receiving cavity. The first vessel body is disposed within the second vessel body, and a first gap is provided between the second vessel body and the first vessel body, wherein a liquid heat transfer medium is disposed in the first gap. The heater is disposed in the first gap and located within the liquid heat transfer medium.

[0007] Optionally, a second gap is provided between the sidewall of the cement slurry cup and the sidewall of the first vessel, and the liquid heat transfer medium is disposed in the second gap.

[0008] Optionally, the cement slurry volume change rate testing device further includes a main pipeline and a pump, with both ends of the main pipeline connected to the first reactor body and the pump, respectively, and the main pipeline communicating with the receiving cavity.

[0009] Optionally, the cement slurry volume change rate testing device further includes a pressure relief pipeline and a pressure relief valve. One end of the pressure relief pipeline is connected to the main pipeline, and the other end of the pressure relief pipeline extends into the first gap. The pressure relief valve is installed on the pressure relief pipeline.

[0010] Optionally, the pressure relief pipeline is located at a height higher than the liquid level of the liquid heat transfer medium in the first gap.

[0011] Optionally, the height of the connection end between the main pipeline and the pump is higher than the height of the receiving cavity.

[0012] Optionally, the heater is fitted onto the first vessel body, and the heater and the first vessel body are disposed separately, as are the heater and the second vessel body.

[0013] Optionally, the cement slurry volume change rate testing device further includes a support leg, which is connected to the bottom of the second vessel.

[0014] Optionally, the connection end between the support leg and the second vessel body is located below the first vessel body.

[0015] This application also provides a method for testing the volume change rate of cement slurry, which uses the aforementioned cement slurry volume change rate testing device, including:

[0016] Apply a release agent to the inner wall of the cement slurry cup;

[0017] Preheat the cement slurry, and preheat the first and second reactor bodies to the target temperature;

[0018] Fill the cement slurry cup with cement slurry and place the cement slurry cup inside the first reactor.

[0019] A liquid heat transfer medium is injected into the first gap and the first vessel body;

[0020] Open the pressure relief valve and tighten the vessel lid to allow excess liquid heat transfer medium in the first vessel to flow into the first gap through the pressure relief pipeline;

[0021] The pump is used to pressurize the containment chamber until the target pressure is reached; and

[0022] The cement slurry volume change rate is generated based on the target temperature, target pressure, PR equation of state, and volume change rate formula.

[0023] The beneficial effects of this application are as follows: It comprises a cement slurry cup, a first vessel body, a vessel lid, a second vessel body, and a heater. The vessel lid and the first vessel body are connected to form a receiving cavity, within which the cement slurry cup is disposed. The first vessel body is disposed within the second vessel body, and a first gap is provided between the second vessel body and the first vessel body, within which a liquid heat transfer medium is disposed. The heater is disposed within the first gap and is located within the liquid heat transfer medium. Because the heater is disposed within the first gap and is located within the liquid heat transfer medium, there is no need to provide additional space within the first vessel body to place the heater, making the heater placement more convenient.

[0024] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, the following describes the application in detail with reference to the preferred embodiments and accompanying drawings. Attached Figure Description

[0025] Figure 1 This is a cross-sectional schematic diagram of the cement slurry volume change rate testing device in the first embodiment of this application;

[0026] Figure 2 This is a flowchart of the cement slurry volume change rate test method in the second embodiment of this application.

[0027] In the attached figures, the following labels are used:

[0028] 100 cement slurry cup

[0029] 101 First Cauldron

[0030] 102 cauldron cover

[0031] 103 Second vessel

[0032] 104 Heater

[0033] 105 Main Line

[0034] 106 Pressure Relief Pipeline

[0035] 107 Temperature Sensor

[0036] 108 Pressure Sensor

[0037] 109 Data Acquisition and Processing System

[0038] 110 pump

[0039] 111 Pressure relief valve

[0040] 112 outriggers

[0041] G1 First Gap

[0042] G2 Second Gap

[0043] S1-S7: Steps for testing the volume change rate of cement paste Detailed Implementation

[0044] The following specific embodiments illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification.

[0045] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present application will now be described in detail with reference to the accompanying drawings and embodiments. To enable those skilled in the art to better understand the solutions of this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this application.

[0046] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products, or devices.

[0047] It should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0048] First Embodiment

[0049] like Figure 1As shown, this embodiment provides a cement slurry volume change rate testing device, including a cement slurry cup 100, a first vessel body 101, a vessel lid 102, a second vessel body 103, and a heater 104. The vessel lid 102 and the first vessel body 101 are connected to form a receiving cavity, and the cement slurry cup 100 is disposed within the receiving cavity. The first vessel body 101 is disposed within the second vessel body 103, and a first gap G1 is provided between the second vessel body 103 and the first vessel body 101, in which a liquid heat transfer medium is disposed. The heater 104 is disposed within the first gap G1 and is located within the liquid heat transfer medium.

[0050] like Figure 1 As shown, since the heater 104 is located in the first gap G1 and in the liquid heat transfer medium, there is no need to set up space in the first vessel 101 to place the heater 104, which makes the installation of the heater 104 more convenient.

[0051] like Figure 1 As shown, the first vessel body 101, vessel cover 102, and second vessel body 103 can be made of metal, such as steel. The cement slurry cup 100 can be made of cast iron. The top of the second vessel body 103 may have an opening, which can be covered by a cover plate to prevent dust from entering the second vessel body 103. The tops of the first vessel body 101 and the vessel cover 102 are exposed outside the second vessel body 103. The sidewall thickness of the first vessel body 101 is greater than the sidewall thickness of the second vessel body 103. The main pipeline 105 and the pressure relief pipeline 106 can pass through the cover plate. The heater 104 can be a resistance wire, a ceramic heater, or a quartz tube. The liquid heat transfer medium can be paraffin oil or other mineral-based heat transfer oils. For example, the liquid heat transfer medium can be No. 43 paraffin oil.

[0052] like Figure 1 As shown, tapered pipe threads can be respectively provided on the lid 102 and the first vessel body 101, allowing the lid 102 and the first vessel body 101 to be threadedly connected to form a sealed receiving cavity. The tops of the lid 102 and the first vessel body 101 are connected. A temperature sensor 107 can be installed on the lid 102, with one end of the temperature sensor 107 extending into the cement slurry in the cement slurry cup 100 and the other end embedded in the lid 102. A pressure sensor 108 can be installed on the upper left side of the first vessel body 101. One end of the pressure sensor 108 is in contact with the liquid heat transfer medium in the receiving cavity. The pump 110, heater 104, pressure sensor 108, and temperature sensor 107 can be electrically connected to the data acquisition and processing system 109 via wires. After the data acquisition and processing system 109 sets the target temperature, the data acquisition and processing system 109 can control the heater 104 to heat until the temperature measured by the temperature sensor 107 reaches the target temperature.

[0053] like Figure 1As shown, after the target pressure is set in the data acquisition and processing system 109, the system can control the pump 110 to pressurize the containment cavity until the pressure measured by the pressure sensor 108 reaches the target pressure. The target temperature can be measured by the temperature sensor 107, and the target pressure can be measured by the pressure sensor 108. The data acquisition and processing system 109 can generate the cement slurry volume change rate based on the target pressure measured by the pressure sensor 108, the target temperature measured by the temperature sensor 107, the PR state equation, and the volume change rate formula. For the specific method of generating the cement slurry volume change rate, please refer to the second embodiment. The data acquisition and processing system 109 can be an industrial control computer.

[0054] like Figure 1 As shown, the cement slurry cup 100, the first vessel body 101, and the second vessel body 103 can be coaxially arranged. The top of the cement slurry cup 100 is spaced apart from the bottom of the vessel cover 102, and the bottom of the cement slurry cup 100 abuts against the inner bottom surface of the first vessel body 101. The outer bottom surface of the first vessel body 101 can abut against the inner bottom surface of the second vessel body 103. The bottom thickness of the first vessel body 101 is less than the bottom thickness of the second vessel body 103. The height of the heater 104 is higher than the height of the cement slurry cup 100. The liquid level of the liquid heat transfer medium in the first gap G1 is higher than the height of the heater 104. The liquid level of the liquid heat transfer medium in the receiving cavity is higher than the height of the cement slurry cup 100.

[0055] like Figure 1 As shown, optionally, a second gap G2 is provided between the side wall of the cement slurry cup 100 and the side wall of the first vessel 101, and a liquid heat transfer medium is disposed in the second gap G2. This arrangement avoids the formation of an air gap between the side wall of the cement slurry cup 100 and the side wall of the first vessel 101, improving the heat transfer efficiency between the cement slurry cup 100 and the first vessel 101, as the presence of an air gap would lead to poor heat transfer from the first vessel 101 to the cement slurry cup 100. The second gap G2 is located within the receiving cavity. The second gap G2 is located between the outer side wall of the cement slurry cup 100 and the inner side wall of the first vessel 101.

[0056] like Figure 1 As shown, before the lid 102 is closed, the liquid level of the liquid heat transfer medium in the first vessel body 101 can be higher than the height of the receiving cavity. After the lid 102 is closed, the excess liquid heat transfer medium in the first vessel body 101 can be released into the first gap G1 through the pressure relief pipeline 106, thereby ensuring that the receiving cavity is filled with liquid heat transfer medium. The receiving cavity is the space formed by the lid 102 and the first vessel body 101 after the lid 102 is closed. The first gap G1 and the second gap G2 both contain the same liquid heat transfer medium, which can prevent the liquid heat transfer medium flowing out of the second gap G2 from contaminating the liquid heat transfer medium in the first gap G1.

[0057] like Figure 1As shown, optionally, the cement slurry volume change rate testing device also includes a main pipeline 105 and a pump 110. The two ends of the main pipeline 105 are connected to the first vessel 101 and the pump 110 respectively, and the main pipeline 105 communicates with the receiving cavity. The main pipeline 105 and the pressure relief pipeline 106 can be stainless steel pipes, seamless steel pipes, or rubber hoses. The left end of the main pipeline 105 can be connected to the right side of the first vessel 101 via a threaded connection. The right end of the main pipeline 105 can be connected to the pump 110 via a flange connection or a threaded connection. The pump 110 can be a gear pump or a plunger pump, etc.

[0058] like Figure 1 As shown, optionally, the cement slurry volume change rate testing device also includes a pressure relief pipeline 106 and a pressure relief valve 111. One end of the pressure relief pipeline 106 is connected to the main pipeline 105, and the other end of the pressure relief pipeline 106 extends into the first gap G1. The pressure relief valve 111 is installed on the pressure relief pipeline 106. Since the other end of the pressure relief pipeline 106 extends into the first gap G1, when pressure relief is required, the liquid heat transfer medium in the first vessel 101 can flow into the first gap G1, preventing the liquid heat transfer medium from being discharged into the environment and causing environmental pollution. Furthermore, the liquid heat transfer medium in the first gap G1 can also be pumped back into the first vessel 101 for reuse.

[0059] like Figure 1 As shown, the top end of the pressure relief pipeline 106 can be connected to the main pipeline 105 at connection point P via threaded connection, flange connection, or welding. The bottom end of the pressure relief pipeline 106 can extend into the top end of the first gap G1. The pressure relief valve 111 can be connected to the pressure relief pipeline 106 via threaded connection or flange connection. By using the pressure relief pipeline 106 for pressure relief, the section of the main pipeline 105 below connection point P can be used both during pressure relief and when the pump 110 pressurizes the receiving cavity, achieving pipeline reuse and simplifying the pipeline. The pressure relief valve 111 can be the FQXZ ball pressure relief check valve from Wenzhou Minjia Valve Co., Ltd.

[0060] like Figure 1 As shown, optionally, the height of the pressure relief line 106 is higher than the liquid level of the liquid heat transfer medium in the first gap G1. This arrangement prevents the pressure relief line 106 from contacting the liquid heat transfer medium in the first gap G1, thereby preventing heat transfer from the liquid heat transfer medium in the first gap G1 to the pressure relief line 106 and preventing the pressure relief line 106 from being overheated and damaged. The height of the pressure relief line 106 is higher than the liquid level of the liquid heat transfer medium in the first gap G1; that is, the lowest point of the pressure relief line 106 is higher than the liquid level of the liquid heat transfer medium in the first gap G1.

[0061] like Figure 1As shown, optionally, the height of the connection end between the main pipeline 105 and the pump 110 is higher than the height of the receiving cavity. This arrangement prevents the liquid heat transfer medium in the first vessel 101 from flowing out of the main pipeline 105 before the vessel lid 102 is closed.

[0062] like Figure 1 As shown, optionally, heater 104 is fitted onto the first vessel 101, with heater 104 and the first vessel 101 spaced apart, and heater 104 and the second vessel 103 spaced apart. This arrangement allows the heat generated by heater 104 to be transferred via the liquid heat transfer medium in the first gap G1, preventing direct contact between heater 104 and either the first or second vessel 101, which could cause excessively rapid temperature changes in either vessel 101 or the second vessel 103. The inner diameter of heater 104 is larger than the outer diameter of the first vessel 101, and the outer diameter of heater 104 is smaller than the inner diameter of the second vessel 103.

[0063] like Figure 1 As shown, optionally, the cement slurry volume change rate testing device also includes a support leg 112, which is connected to the bottom of the second vessel body 103. This arrangement prevents the bottom of the second vessel body 103 from contacting the placement surface of the cement slurry volume change rate testing device (e.g., the ground or tabletop) and damaging the surface. The support leg 112 can be a hollow frustum. The top of the support leg 112 and the bottom of the second vessel body 103 can be connected by welding. The bottom end of the support leg 112 contacts the placement surface. The support leg 112 can be made of steel.

[0064] Optionally, the connection end of the support leg 112 and the second vessel body 103 is located below the first vessel body 101. This arrangement allows most of the weight of the cement slurry volume change rate testing device to be transferred to the support leg 112 via the more robust first vessel body 101, preventing the bottom of the second vessel body 103 from being squeezed and deformed downwards by the first vessel body 101. The projection of the first vessel body 101 along its axial direction coincides with the support leg 112.

[0065] Second Embodiment

[0066] like Figure 2 As shown, this embodiment provides a method for testing the volume change rate of cement slurry, which uses the cement slurry volume change rate testing device from the first embodiment, including:

[0067] S1: Apply a release agent to the inner wall of the cement grout cup 100; the release agent can be grease or sealant.

[0068] S2: Preheat the cement slurry, preheating the first vessel 101 and the second vessel 103 to the target temperature; the target temperatures of the first vessel 101 and the second vessel 103 can be the same and are measured by the temperature sensor 107. The temperature sensor 107 can be a thermocouple or a resistance temperature sensor.

[0069] S3: Fill the cement slurry cup 100 with cement slurry and place the cement slurry cup 100 inside the first reactor body 101;

[0070] S4: Inject liquid heat transfer medium into the first gap G1 and the first vessel 101; the liquid level of the liquid heat transfer medium injected into the first gap G1 should be higher than the height of the heater 104 and lower than the height of the lowest end of the pressure relief pipeline 106, and the liquid level of the liquid heat transfer medium injected into the first vessel 101 should be higher than the height of the receiving cavity.

[0071] S5: Open the pressure relief valve 111 and tighten the vessel lid 102 to allow excess liquid heat transfer medium in the first vessel 101 to flow into the first gap G1 from the pressure relief pipeline 106;

[0072] S6: Use pump 110 to pressurize the receiving chamber until the target pressure is reached; and

[0073] S7: Generate the cement slurry volume change rate based on the target temperature, target pressure, PR equation of state, and volume change rate formula.

[0074] This design allows excess liquid heat transfer medium in the first vessel 101 to fall into the first gap G1, preventing the liquid heat transfer medium from being discharged into the environment and causing pollution. It also allows the liquid heat transfer medium in the first gap G1 to be pumped back into the first vessel 101 for reuse.

[0075] The formula for the volume change rate of cement paste can be as follows:

[0076]

[0077] Where η is the cement volume change rate, %, a negative η indicates shrinkage, and a positive η indicates expansion; V 水泥浆 The initial volume of cement slurry, in cubic meters (m³). 3 V0 represents the initial volume of the liquid heat transfer medium (e.g., paraffin oil), in cubic meters (m³). 3 V PT V is the volume of a liquid heat transfer medium at a certain temperature and pressure. PT It can be obtained through state equations.

[0078] The PR state equation (i.e., the Peng-Robinson state equation) can be expressed as follows:

[0079]

[0080] in,

[0081]

[0082] b = 0.07780RT C / P c

[0083] T ri =T / T c

[0084] Where P is the pressure measured by pressure sensor 108, in MPa, which is also the target pressure; T is the temperature measured by temperature sensor 107, in °C, which is also the target temperature; T C Critical temperature, unit: K; P c ω is the critical pressure, in MPa; R is the universal gas constant, in J / (kg·K); ω is the eccentricity factor of paraffin oil, dimensionless.

[0085] Taking No. 43 paraffin oil as an example. The pressure measured by pressure sensor 108 is 12 MPa, and the temperature measured by temperature sensor 107 is 100℃. Therefore, R = 8.314 MPa·cm. 3 / (mol·K), critical temperature T C The critical pressure P is 938.969 K. c The pressure is 6.0334 MPa, and the eccentricity factor of No. 43 paraffin oil is 1.33114.

[0086] Substituting these parameters into the formula: b = 0.07780RT C / P c ,have to:

[0087]

[0088] Substituting the calculated a and b into the PR state equation, we obtain V. pT = 483.125ml. The inner diameter of the first vessel 101 can be 56mm, and the height from the inner bottom surface of the first vessel 101 to the bottom surface of the vessel cover 102 can be 270mm; the inner diameter of the cement slurry cup 100 can be 50mm, the outer diameter can be 53mm, and the height can be 260mm, then V0 = 481.011ml, V 水泥浆 =500.2ml, the volume change rate η is equal to -0.4226%.

[0089] The foregoing has provided a detailed description of the cement slurry volume change rate testing device and its testing method provided in the embodiments of this application. For those skilled in the art, based on the ideas of the embodiments of this application, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application. All equivalent modifications or changes made in accordance with the spirit and technical concept of this application should still be covered by the claims of this application.

Claims

1. A device for testing the volume change rate of cement slurry, characterized in that, include: Cement slurry cup; First vessel body; A lid is connected to the first vessel body to form a receiving cavity, and the cement slurry cup is disposed within the receiving cavity; A second vessel body, wherein the first vessel body is disposed within the second vessel body, and a first gap is provided between the second vessel body and the first vessel body, wherein a liquid heat transfer medium is disposed in the first gap; and A heater is disposed in the first gap and located in the liquid heat transfer medium.

2. The cement slurry volume change rate testing device according to claim 1, characterized in that, A second gap is provided between the side wall of the cement slurry cup and the side wall of the first vessel, and the liquid heat transfer medium is disposed in the second gap.

3. The cement slurry volume change rate testing device according to claim 2, characterized in that, It also includes a main pipeline and a pump, with both ends of the main pipeline connected to the first vessel body and the pump, respectively, and the main pipeline communicating with the receiving cavity.

4. The cement slurry volume change rate testing device according to claim 3, characterized in that, It also includes a pressure relief pipeline and a pressure relief valve. One end of the pressure relief pipeline is connected to the main pipeline, and the other end of the pressure relief pipeline extends into the first gap. The pressure relief valve is installed on the pressure relief pipeline.

5. The cement slurry volume change rate testing device according to claim 4, characterized in that, The pressure relief pipeline is located at a height higher than the liquid level of the liquid heat transfer medium in the first gap.

6. The cement slurry volume change rate testing device according to claim 4, characterized in that, The height of the connection end between the main pipeline and the pump is higher than the height of the receiving cavity.

7. The cement slurry volume change rate testing device according to claim 4, characterized in that, The heater is sleeved on the first vessel body, and the heater and the first vessel body are disposed apart from each other, and the heater and the second vessel body are disposed apart from each other.

8. The cement slurry volume change rate testing device according to claim 4, characterized in that, It also includes a support leg, which is connected to the bottom of the second vessel body.

9. The cement slurry volume change rate testing device according to claim 8, characterized in that, The connection end between the support leg and the second vessel body is located below the first vessel body.

10. A method for testing the volume change rate of cement slurry, comprising using the cement slurry volume change rate testing apparatus according to any one of claims 4-9, characterized in that, include: Apply a release agent to the inner wall of the cement slurry cup; Preheat the cement slurry, and preheat the first and second reactor bodies to the target temperature; Fill the cement slurry cup with cement slurry and place the cement slurry cup inside the first reactor. A liquid heat transfer medium is injected into the first gap and the first vessel body; Open the pressure relief valve and tighten the vessel lid to allow excess liquid heat transfer medium in the first vessel to flow into the first gap through the pressure relief pipeline; The pump is used to pressurize the containment chamber until the target pressure is reached; and The cement slurry volume change rate is generated based on the target temperature, target pressure, PR equation of state, and volume change rate formula.

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