A device and method for evaluating scale conversion rate and effect under high temperature and high pressure conditions

Abstract

The present invention discloses a device and method for evaluating the scale conversion rate and effect under high-temperature and high-pressure conditions. The device comprises an intermediate container for a sulfate scale solution, an intermediate container for a converter, and a scale conversion kettle. The outlets of the intermediate container for the sulfate scale solution and the intermediate container for the converter are both connected to the fluid inlet of the scale conversion kettle. The scale conversion kettle is provided with a stirring device and a heating device, and a pressure regulating device is provided at the fluid outlet of the scale conversion kettle. The device can be used to evaluate the scale conversion rate and effect under high-temperature and high-pressure conditions.

Description

Technical Field

[0001] The invention belongs to the field of petroleum exploration and development evaluation experiments, and relates to a device and method for evaluating scale type conversion rate and effect under high temperature and high pressure conditions. Background Art

[0002] Currently, formation and wellbore blockage in high-temperature, high-pressure oil and gas wells causes fluctuations in oil pressure and production, adversely impacting tubing safety and production stability. Some wells are completely blocked, preventing normal production. Previous analysis and research suggests that factors such as formation sand production, wellbore scaling, return of lost material, and mud sedimentation may be contributing to the wellbore blockage.

[0003] There are usually three methods to treat blockages in oil and gas wells: the first is to increase the fluid velocity by blowdown to remove the blockage, that is, to expand the production pressure difference and use high-pressure, high-speed gas to remove the blockage in the wellbore. High-pressure gas wells underwent multiple blowdown operations to remove blockages in the early stages of construction, but the results were not ideal. The second is overhaul operations, which involve removing the original tubing from the wellbore and inserting a new tubing to solve the problem of tubing scale blockage. However, treating wellbore blockages through overhaul operations also has problems such as complex processes, long operation cycles, and high costs. The third is acidizing operations. The blockages in high-pressure gas wells are mainly inorganic scale or formation sand. Acidizing is one of the main measures to remove sand or scale blockages in the wellbore and restore gas well production capacity, but conventional acidizing dissolves sulfate scale slowly and has a poor descaling effect.

[0004] However, in the prior art, there is no relevant device that can effectively test the conversion rate and effect of the process of converting acid-insoluble sulfate into acid-soluble substances, and thus cannot conduct effective evaluation and analysis. Summary of the Invention

[0005] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a device and method for evaluating the scale conversion rate and effect under high temperature and high pressure conditions, which can be used to evaluate the scale conversion rate and effect under high temperature and high pressure conditions.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A device for evaluating the scale type conversion rate and effect under high temperature and high pressure conditions, comprising an intermediate container for a sulfate scale solution, an intermediate container for a conversion agent, and a scale type conversion kettle;

[0008] The outlets of the sulfate scale solution intermediate container and the converter intermediate container are both connected to the fluid inlet of the scale type converter kettle. The scale type converter kettle is provided with a stirring device and a heating device, and the fluid outlet of the scale type converter kettle is provided with a pressure regulating device.

[0009] Preferably, the inlets of the sulfate scale solution intermediate container and the converting agent intermediate container are connected to the outlet of the horizontal flow pump, and the inlet of the horizontal flow pump is connected to the displacement fluid.

[0010] Preferably, the solution in the sulfate scale solution intermediate container is a solution of CaSO4, BaSO4 and SrSO4.

[0011] Preferably, the solution in the intermediate container of the conversion agent is composed of two parts, one part is the hydroxide or carbonate of sodium salt and potassium salt, and the other part is the well fluid.

[0012] Preferably, the outlets of the sulfate scale solution intermediate container and the converting agent intermediate container are respectively provided with a one-way valve.

[0013] Preferably, the stirring device includes a magnetic stirring device, a magnetic stirring rotor and a fixed pin, the fixed pin is fixed to the inner wall of the scale-type conversion kettle, the center position of the magnetic stirring rotor is nested on the fixed pin, and the magnetic stirring rotor is rotatably connected to the fixed pin, and the magnetic stirring device is located outside the scale-type conversion kettle, corresponding to the position of the magnetic stirring rotor.

[0014] Preferably, the scale-type conversion kettle has two fluid outlets, which are located on the side of the scale-type conversion kettle near the bottom and the upper middle position respectively.

[0015] Furthermore, a pressure gauge is provided in the scale-type conversion kettle, and the reading portion of the pressure gauge is located outside the scale-type conversion kettle.

[0016] Preferably, the heating device is connected to a temperature control device.

[0017] A method for evaluating the scale conversion rate and effect under high temperature and high pressure conditions based on any of the above-mentioned devices comprises: injecting the solutions in the sulfate scale solution intermediate container and the converter intermediate container into the scale conversion kettle, turning on a stirring device, stirring for a set time, and then standing the device until the system is stable. Then, the mixed liquid in the scale conversion kettle is sampled, and the content of each ion in the fluid sample is measured. By comparing the ion change and the injection fluid ratio, the scale conversion degree under high temperature and high pressure conditions is calculated; and by sampling and analyzing the mixed liquid in the scale conversion kettle under different time conditions, the scale conversion rate and effect under high temperature and high pressure conditions are evaluated.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The present invention injects the solutions in the sulfate scale solution intermediate container and the converter intermediate container into a scale conversion kettle, stirs to allow the sulfate scale solution and the converter to react, and then samples the mixed liquid in the scale conversion kettle to measure the ion content of the fluid sample. By comparing the ion changes and the injected fluid ratio, the scale conversion degree under high temperature and high pressure conditions can be calculated. By sampling and analyzing the mixed liquid in the scale conversion kettle under different time conditions, the scale conversion rate and effect under high temperature and high pressure conditions can be evaluated.

[0020] Furthermore, the flow rate of the solutions in the sulfate scale solution intermediate container and the converter intermediate container injected into the scale-type converter can be controlled by the one-way valve, thereby controlling the ratio of the two solutions.

[0021] Furthermore, the use of a magnetic stirring device can avoid opening holes in the scale-type conversion kettle, thereby ensuring its sealing and ensuring high-pressure conditions.

[0022] Furthermore, the scale-type conversion kettle is provided with two outlets, which can determine whether the mixed fluid is a single homogeneous liquid phase through parallel samples, thereby avoiding experimental errors. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Schematic diagram of the device of the present invention.

[0024] Among them: 1. Displacement fluid; 2. Horizontal flow pump; 3. Intermediate container for sulfate scale solution; 4. Intermediate container for converter; 5. Check valve; 6. Scale-type converter; 7. Temperature control device; 8. Heating device; 9. Pressure gauge; 10. Magnetic stirring rotor; 11. Magnetic stirring device; 12. Fixing pin; 13. Pressure regulating device; 14. Recovery device. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0026] It should be noted that the words "front", "rear", "left", "right", "up" and "down" used in the following description refer to directions in the accompanying drawings, and the words "inside" and "outside" refer to directions toward or away from the geometric center of a specific component, respectively.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used herein in the specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0028] Example 1:

[0029] like Figure 1 As shown, the device for evaluating the scale conversion rate and effect under high temperature and high pressure conditions of the present invention includes a horizontal flow pump 2, a sulfate scale solution intermediate container 3, a conversion agent intermediate container 4 and a scale conversion kettle 6.

[0030] The inlet of the horizontal flow pump 2 is connected to the displacement fluid 1. In this embodiment, the displacement fluid 1 is distilled water. The inlets of the sulfate scale solution intermediate container 3 and the converter intermediate container 4 are connected to the outlet of the horizontal flow pump 2. The sulfate scale solution intermediate container 3 and the converter intermediate container 4 both use a hydraulic piston device. One side of the piston is connected to the outlet of the horizontal flow pump 2, and the cavity on the other side of the piston is provided with a sulfate scale solution or a converter. The displacement fluid 1 is pumped into one side of the piston by the horizontal flow pump 2. As the pressure increases, the displacement fluid 1 pushes the piston to move, thereby discharging the sulfate scale solution or the converter.

[0031] Sulfate scale solution is mainly composed of aqueous solutions of scales such as CaSO4, BaSO4, SrSO4, etc. that are difficult to dissolve in acid.

[0032] The conversion agent is a liquid compounded by hydroxide or carbonate of sodium salt, potassium salt, etc. combined with other well fluids such as clay stabilizer, drainage aid, corrosion inhibitor, etc.

[0033] The outlets of the sulfate scale solution intermediate container 3 and the converter intermediate container 4 are both connected to the fluid inlet of the scale type converter kettle 6. A check valve 5 is provided between the outlets of the sulfate scale solution intermediate container 3 and the converter intermediate container 4 and the fluid inlet of the scale type converter kettle 6. The check valve 5 is oriented in a direction from the outlet of the sulfate scale solution intermediate container 3 and the converter intermediate container 4 to the fluid inlet of the scale type converter kettle 6 to prevent the sulfate scale solution and the converter from flowing back and affecting the test results.

[0034] The left and right ends of the scale-type conversion kettle 6 are respectively provided with a fluid inlet and a fluid outlet. The fluid inlet is connected to the outlet of the sulfate scale solution intermediate container 3 and the converter intermediate container 4. The upper end of the scale-type conversion kettle 6 is connected to a pressure gauge 9 and a temperature control device 7. The reading part of the pressure gauge 9 is located outside the scale-type conversion kettle 6, and the measuring part is located inside the scale-type conversion kettle 6. The outside of the scale-type conversion kettle 6 is wrapped with a heating device 8, and the heating device 8 is connected to the temperature control device 7. The heating device 8 can use a resistance wire wrapped with heat-insulating cotton.

[0035] A stirring device is installed at the bottom of the scale-type conversion kettle 6. The stirring device of this embodiment includes a magnetic stirring device 11, a magnetic stirring rotor 10 and a fixed pin 12. The fixed pin 12 is fixed to the inner wall of the scale-type conversion kettle 6. The preferred fixed pin 12 of this embodiment is located at the bottom of the inner cavity of the scale-type conversion kettle 6. The center position of the magnetic stirring rotor 10 is nested on the fixed pin 12, and the magnetic stirring rotor 10 is rotatably connected to the fixed pin 12. The bottom of the fixed pin 12 is threadedly connected to the inner wall of the scale-type conversion kettle 6. A radial extension portion is provided on the top of the fixed pin 12, and the magnetic stirring rotor 10 is located at the radial extension portion. Below, the radial extension part can limit the magnetic stirring rotor 10 from disengaging from the fixing pin 12 during rotation; the magnetic stirring device 11 is located outside the scale-type conversion kettle 6, corresponding to the position of the magnetic stirring rotor 10, and the magnetic stirring device 11 can generate a magnetic field. By utilizing the principle of like charges repelling and opposite charges attracting in the magnetic field, the magnetic stirring device 11 can make the magnetic magnetic stirring rotor 10 located inside the scale-type conversion kettle 6 rotate in a circular motion, thereby achieving the purpose of stirring the liquid. The magnetic stirring device 11 can control the speed and working time of the magnetic stirring rotor 10 by controlling the size of the magnetic field and the time when the magnetic field is turned on.

[0036] In this embodiment, the magnetic stirring device 11 uses a H01-2G constant temperature magnetic stirrer.

[0037] This product is a large-capacity, high-power digital display magnetic stirrer, suitable for the test in this application, and has a sturdy structure.

[0038] This product is driven by a brushless DC motor and controlled by a microcomputer, with stable speed and precise temperature control.

[0039] The product has two LED digital display windows that can display the rotation speed, timing time, medium temperature, heating plate temperature, etc.

[0040] The product is fully key-operated and the setting data can be saved even when the power is off.

[0041] The main technical parameters are shown in Table 1:

[0042] Table 1 Main parameters of H01-2G constant temperature magnetic stirrer

[0043]

[0044]

[0045] There are two fluid outlets of the scale-type conversion kettle 6, which are located on the side of the scale-type conversion kettle 6 near the bottom and the middle upper position respectively. The two fluid outlets are connected to the recovery device 14 through pipes respectively, and the two pipes are respectively provided with a pressure regulating device 13 for controlling the pressure of the scale-type conversion kettle 6.

[0046] The method for evaluating the scale conversion rate and effect under high temperature and high pressure conditions of the present invention comprises the following steps:

[0047] S1, mix the sulfate scale solution and the conversion agent.

[0048] S2, stirring the mixed liquid for a set time.

[0049] S3, sample the mixed liquid, measure the content of each ion in the fluid sample, and calculate the degree of scale conversion under high temperature and high pressure conditions by comparing the ion changes and the injection fluid ratio; evaluate the scale conversion rate and effect under high temperature and high pressure conditions by sampling and analyzing the mixed liquid under different time conditions.

[0050] The specific operation process is as follows:

[0051] The displacement fluid 1 is injected into the inlets of the sulfate scale solution intermediate container 3 and the converter intermediate container 4 via a horizontal flow pump 2. The displacement fluid 1 pushes the piston, injecting the sulfate scale solution in the sulfate scale solution intermediate container 3 into the scale conversion kettle 6 through a check valve 5, and injecting the converter in the converter intermediate container 4 into the scale conversion kettle 6 through a check valve 5. After the sulfate scale solution and the converter are mixed and reacted, the heating device 8 is turned on to heat the mixed liquid in the scale conversion kettle 6. The temperature is controlled by the temperature control device 7. The bottom magnetic stirring device 11 is turned on and stirred for a set time, then the magnetic stirring device 11 is turned off. After the system is allowed to stand for stability, the mixed liquid in the scale conversion kettle 6 is sampled and the ion content of the fluid sample is measured. By comparing the ion changes and the injected fluid ratio, the degree of scale conversion under high temperature and high pressure conditions is calculated. By sampling and analyzing the mixed liquid in the scale conversion kettle 6 under different time conditions, the scale conversion rate and effect under high temperature and high pressure conditions are evaluated.

[0052] Example 2:

[0053] The heating device 8 can be a thermostat, and the temperature control device 7 is a device built into the thermostat. When in use, the entire scale-type conversion kettle 6 is placed in the thermostat, and the temperature of the scale-type conversion kettle 6 is controlled by selecting the temperature of the thermostat.

[0054] In this embodiment, the ETH series constant temperature and humidity test chamber is used, which has an ultra-wide temperature range of -160 to 200°C, a low temperature control accuracy of ±0.1°C, and a temperature uniformity as low as 0.2°C.

[0055] Specific parameters are shown in Table 2.

[0056] Table 2 ETH series constant temperature and humidity test chamber parameters

[0057]

[0058]

[0059] The remaining components and processes are the same as in the previous embodiment.

[0060] Example 3:

[0061] In this embodiment, flow valves are provided between the inlets of the sulfate scale solution intermediate container 3 and the converter intermediate container 4 and the outlet of the horizontal flow pump 2. Through the two flow valves, after the horizontal flow pump 2 pumps out the displacement fluid 1, the opening of the flow valves can be controlled to control the volume of the displacement fluid 1 entering the sulfate scale solution intermediate container 3 and the converter intermediate container 4, thereby controlling the flow volume of the sulfate scale solution and the converter output from the sulfate scale solution intermediate container 3 and the converter intermediate container 4. In this way, by using the volume difference between the two liquids, experiments under various ratio relationships can be carried out.

[0062] The specific operation process is: by controlling the opening of the flow valve, the volume of the displacement fluid 1 entering the sulfate scale solution intermediate container 3 and the converter intermediate container 4 is controlled, thereby controlling the flow volume of the sulfate scale solution intermediate container 3 and the converter intermediate container 4 outgoing sulfate scale solution and converter. Through the difference in volume, the scale conversion rate and effect under various ratio relationships are evaluated.

[0063] The remaining components and processes are the same as in the previous embodiment.

[0064] Example 4:

[0065] In this embodiment, the horizontal flow pump 2 and the displacement fluid 1 are not required. Instead, the hydraulic piston device adopts a servo electric hydraulic cylinder, which can realize stepless pressure and speed regulation of the hydraulic cylinder and AC power supply, thereby achieving rapid response.

[0066] Features include:

[0067] 1) It can be extended, positioned and speed-regulated under the drive of CAN control signal.

[0068] 2) Load conditions can be fed back via the CAN bus.

[0069] 3) The telescopic position and location information can be fed back via the CAN bus.

[0070] 4) It can run according to the stroke-speed curve set by the user.

[0071] 5) Thrust and speed can be adjusted steplessly with an accuracy of less than 1%.

[0072] Control methods include:

[0073] 1) CAN bus, Bluetooth and other remote wireless control.

[0074] 2) Local control such as touch screen and human-machine interface.

[0075] 3) 24v switch weak current signal control.

[0076] The specific parameters of the servo electro-hydraulic cylinder are shown in Table 3:

[0077] Table 3 Performance, size and weight of servo electric hydraulic cylinder

[0078]

[0079]

[0080] By adopting the servo electric hydraulic cylinder, the flow volume of the sulfate scale solution and the converter outputted from the sulfate scale solution intermediate container 3 and the converter intermediate container 4 can be accurately controlled, and the volumes of the sulfate scale solution and the converter can be conveniently calculated respectively. Thus, by using the volume difference of the sulfate scale solution and the converter, experiments under various ratio relationships can be carried out, and accurate data results can be obtained.

[0081] The specific operation process is: by controlling the piston movement distance of the servo electric hydraulic cylinder, the flow volume of sulfate scale solution and converter output from the sulfate scale solution intermediate container 3 and the converter intermediate container 4 is controlled, and the scale conversion rate and effect under various ratio relationships are evaluated based on the volume difference.

[0082] The remaining components and processes are the same as in the previous embodiment.

[0083] The following are system embodiments of the present invention, which can be used to implement the method embodiments of the present invention. For details not disclosed in the system embodiments, please refer to the method embodiments of the present invention.

[0084] In another embodiment of the present invention, a system for evaluating the scale conversion rate and effect under high temperature and high pressure conditions is provided. The system for evaluating the scale conversion rate and effect under high temperature and high pressure conditions can be used to implement the above-mentioned method for evaluating the scale conversion rate and effect under high temperature and high pressure conditions.

[0085] Specifically, the system for evaluating the scale conversion rate and effect under high temperature and high pressure conditions includes a mixing module, a stirring module, and a scale conversion rate and effect evaluation module.

[0086] The mixing module is used to mix the sulfate scale solution and the conversion agent.

[0087] The stirring module is used to stir the mixed liquid for a set time.

[0088] The scale conversion rate and effect evaluation module is used to sample the mixed liquid, measure the content of each ion in the fluid sample, and calculate the degree of scale conversion under high temperature and high pressure conditions by comparing the ion changes and the injection fluid ratio; by sampling and analyzing the mixed liquid under different time conditions, the scale conversion rate and effect under high temperature and high pressure conditions are evaluated.

[0089] In another embodiment of the present invention, a terminal device is provided, which includes a processor and a memory, wherein the memory is used to store a computer program, the computer program includes program instructions, and the processor is used to execute the program instructions stored in the computer storage medium. The processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. It is the computing core and control core of the terminal, which is suitable for implementing one or more instructions, specifically suitable for loading and executing one or more instructions to implement the corresponding method flow or corresponding function; the processor described in the embodiment of the present invention can be used to evaluate the operation of the scale conversion rate and effect method under high temperature and high pressure conditions, including:

[0090] S1, mix the sulfate scale solution and the conversion agent.

[0091] S2, stirring the mixed liquid for a set time.

[0092] S3, sample the mixed liquid, measure the content of each ion in the fluid sample, and calculate the degree of scale conversion under high temperature and high pressure conditions by comparing the ion changes and the injection fluid ratio; evaluate the scale conversion rate and effect under high temperature and high pressure conditions by sampling and analyzing the mixed liquid under different time conditions.

[0093] In another embodiment, the present invention further provides a computer-readable storage medium (Memory), which is a memory device in a terminal device for storing programs and data. It is understood that the computer-readable storage medium herein may include both built-in storage media in the terminal device and, of course, extended storage media supported by the terminal device.

[0094] The computer-readable storage medium provides storage space that stores the terminal's operating system. Furthermore, the storage space also stores one or more instructions suitable for being loaded and executed by the processor. These instructions may be one or more computer programs (including program code). It should be noted that the computer-readable storage medium herein may be high-speed RAM memory or non-volatile memory, such as at least one disk storage device.

[0095] The processor may load and execute one or more instructions stored in a computer-readable storage medium to implement the corresponding steps of the method for evaluating the scaling conversion rate and effect under high temperature and high pressure conditions in the above embodiment; the processor may load and execute the following steps:

[0096] S1, mix the sulfate scale solution and the conversion agent.

[0097] S2, stirring the mixed liquid for a set time.

[0098] S3, sample the mixed liquid, measure the content of each ion in the fluid sample, and calculate the degree of scale conversion under high temperature and high pressure conditions by comparing the ion changes and the injection fluid ratio; evaluate the scale conversion rate and effect under high temperature and high pressure conditions by sampling and analyzing the mixed liquid under different time conditions.

[0099] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0100] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the steps in the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0101] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0102] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0103] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0104] It should be understood that the above description is for illustrative purposes only and is not intended to be limiting. Many embodiments and many applications beyond the examples provided will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of the present teachings should not be determined with reference to the above description, but rather with reference to the preceding claims and the full scope of equivalents to which such claims are entitled. For the purpose of completeness, all articles and references, including disclosures of patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein from the preceding claims is not a disclaimer of such subject matter, nor should it be considered that the applicants did not consider such subject matter to be part of the disclosed inventive subject matter.

Claims

1. A method for evaluating the scale conversion rate and effect under high temperature and high pressure conditions, characterized in that: The invention comprises a device for evaluating the scale conversion rate and effect under high temperature and high pressure conditions, wherein the device comprises an intermediate container (3) for a sulfate scale solution, an intermediate container (4) for a conversion agent, and a scale conversion kettle (6); The outlets of the sulfate scale solution intermediate container (3) and the converter intermediate container (4) are both connected to the fluid inlet of the scale-type converter kettle (6). The scale-type converter kettle (6) is provided with a stirring device and a heating device (8). The fluid outlet of the scale-type converter kettle (6) is provided with a pressure regulating device (13). The method comprises: injecting the solution in the sulfate scale solution intermediate container (3) and the converter intermediate container (4) into the scale type conversion kettle (6), turning on a stirring device, stirring for a set time, and then turning off the stirring device, standing for the system to stabilize, sampling the mixed liquid in the scale type conversion kettle (6), measuring the content of each ion in the fluid sample, and calculating the scale type conversion degree under high temperature and high pressure conditions by comparing the ion change and the injection fluid ratio; and evaluating the scale type conversion rate and effect under high temperature and high pressure conditions by sampling and analyzing the mixed liquid in the scale type conversion kettle (6) under different time conditions.

2. The method for evaluating the scale conversion rate and effect under high temperature and high pressure conditions according to claim 1, characterized in that: The inlets of the sulfate scale solution intermediate container (3) and the converter intermediate container (4) are connected to the outlet of the horizontal flow pump (2), and the inlet of the horizontal flow pump (2) is connected to the displacement fluid (1).

3. The method for evaluating the scale conversion rate and effect under high temperature and high pressure conditions according to claim 1, characterized in that: The solution in the sulfate scale solution intermediate container (3) is CaSO4, BaSO4 and SrSO4 solution.

4. The method for evaluating the scale conversion rate and effect under high temperature and high pressure conditions according to claim 1 is characterized in that: The solution in the converter intermediate container (4) is composed of two parts, one part is the hydroxide or carbonate of sodium salt and potassium salt, and the other part is the well fluid.

5. The method for evaluating the scale conversion rate and effect under high temperature and high pressure conditions according to claim 1, characterized in that: The outlets of the sulfate scale solution intermediate container (3) and the converter intermediate container (4) are respectively provided with a check valve (5).

6. The method for evaluating the scale conversion rate and effect under high temperature and high pressure conditions according to claim 1, characterized in that: The stirring device comprises a magnetic stirring device (11), a magnetic stirring rotor (10) and a fixing pin (12), wherein the fixing pin (12) is fixed to the inner wall of the scale-type conversion kettle (6), the center position of the magnetic stirring rotor (10) is nested on the fixing pin (12), and the magnetic stirring rotor (10) is rotatably connected to the fixing pin (12), and the magnetic stirring device (11) is located outside the scale-type conversion kettle (6) and corresponds to the position of the magnetic stirring rotor (10).

7. The method for evaluating the scale conversion rate and effect under high temperature and high pressure conditions according to claim 1, characterized in that: The scale-type conversion kettle (6) has two fluid outlets, which are located at a position near the bottom and a position near the middle upper part of the side of the scale-type conversion kettle (6).

8. The method for evaluating the scale conversion rate and effect under high temperature and high pressure conditions according to claim 7, characterized in that: A pressure gauge (9) is provided in the scale-type conversion kettle (6), and a reading portion of the pressure gauge (9) is located outside the scale-type conversion kettle (6).

9. The method for evaluating the scale conversion rate and effect under high temperature and high pressure conditions according to claim 1, characterized in that: The heating device (8) is connected to the temperature control device (7).

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