Reaction device for simulating calcium carbonate precipitation at different CO2 degassing rates

Abstract

The utility model relates to the field of geothermal shaft calcium carbonate scaling experiment devices, particularly discloses a reaction device for simulating calcium carbonate precipitation at different CO2 degassing rates, and solves the technical problem that the simulation requirement of a calcium carbonate scaling process of high-temperature and high-pressure geothermal fluid under the degassing condition is difficult to meet in the current experiment process. The reaction kettle is provided with an air inlet pipe with a pipe orifice positioned below the liquid level in the kettle and an air outlet pipe with a pipe orifice positioned above the liquid level in the kettle, and the outer side of the reaction kettle is sleeved with an electric jacket; the carbon dioxide storage bottle is communicated with the air inlet pipe through an air pump; the nitrogen storage bottle is communicated with the gas inlet pipe through a gas pump; the tail gas recycling box is communicated with the gas outlet pipe through a back pressure regulator; the monitoring unit comprises a temperature detector, a pressure detector and a short wave infrared camera; the central processing unit is electrically connected with the monitoring unit; the device can meet the requirement of simulating the calcium carbonate scaling process under the degassing condition of online observation of high-temperature and high-pressure geothermal fluid, and particularly can simulate the calcium carbonate precipitation process under different CO2 degassing rates.

Description

TECHNICAL FIELD

[0001] The utility model relates to geothermal wellbore calcium carbonate scaling experimental device technical field, specifically, relate to a kind of reaction device of simulating calcium carbonate precipitation under different CO2 degassing rate. BACKGROUND

[0002] As a clean and renewable energy, the development and utilization of geothermal resources are gradually becoming the focus of global attention. However, during the exploitation of geothermal fluids, the precipitation of minerals such as calcium carbonate often occurs due to changes in temperature and pressure, resulting in scaling phenomena. This not only seriously affects the exploitation efficiency of geothermal wells, but also shortens the service life of related equipment. In particular, under high temperature and high pressure conditions, the degassing process of carbon dioxide (CO2) in geothermal fluids plays a key role in the formation of calcium carbonate scaling. Therefore, in-depth study of the characteristics of calcium carbonate scaling in geothermal wellbores under different CO2 degassing rates is of great importance for optimizing the efficient use of geothermal resources.

[0003] Currently, research on calcium carbonate scaling in geothermal wellbores has made some progress. For example, some literature has constructed mathematical models to simulate the flow of geothermal fluids in the wellbore and the process of calcium carbonate scaling, and has explored the influence mechanism of factors such as temperature, pressure, and CO2 partial pressure on scaling. In addition, some studies have reconstructed reservoir fluid components using geochemical software and conducted scale inhibitor optimization experiments using high-temperature and high-pressure reaction kettles to evaluate the effectiveness of different scale inhibitors. However, these studies mainly focus on theoretical simulation and scale inhibitor evaluation, and lack of experimental devices for simulating calcium carbonate scaling under different CO2 degassing rates. As can be seen from the above, the existing technology cannot provide experimental devices specifically for simulating calcium carbonate scaling in geothermal wellbores under different CO2 degassing rates, which makes it difficult to directly observe and quantify the specific impact of CO2 degassing on the scaling process. Most existing experimental devices are only suitable for low-temperature, low-pressure, static environments, and cannot meet the real simulation needs of geothermal fluids under high-temperature, high-pressure, dynamic conditions, limiting the application range of research results. At the same time, due to the limitations of experimental devices and technical methods, the data obtained has significant differences from the actual scaling conditions in geothermal wellbores, making it difficult to accurately guide field operations and decision-making. UTILITY MODEL CONTENT

[0004] The utility model aims to provide a kind of reaction device of simulating calcium carbonate precipitation under different CO2 degassing rate, solve the technical problem that the experimental device is difficult to meet the simulation needs of calcium carbonate scaling process under degassing conditions of high-temperature and high-pressure geothermal fluids during use process at present.

[0005] The utility model provides a kind of reaction device of simulating calcium carbonate precipitation under different CO2 degassing rate, comprising: reaction kettle, outside is equipped with electric heating jacket, the reaction kettle is equipped with air inlet pipe and air outlet pipe, the air inlet pipe mouth is below the liquid level in the reaction kettle, the air outlet pipe mouth is above the liquid level in the reaction kettle, the air inlet pipe and the air outlet pipe are equipped with valve;Carbon dioxide gas cylinder is connected with the air inlet pipe by gas pump;Nitrogen gas cylinder is connected with the air inlet pipe by the gas pump;Tail gas recovery tank is connected with the air outlet pipe by back pressure regulator;Monitoring unit includes temperature detector, pressure detector and shortwave infrared camera, is used for monitoring temperature, pressure and reaction state in reaction kettle respectively;Central processing unit is electrically connected with the monitoring unit.

[0006] According to one embodiment of the utility model, the electric heating jacket is a magnetic stirring electric heating jacket.

[0007] According to one embodiment of the utility model, a flow meter is arranged between the gas pump and the air inlet pipe.

[0008] According to one embodiment of the utility model, a flow meter is arranged between the back pressure regulator and the tail gas recovery tank.

[0009] According to one embodiment of the utility model, the reaction kettle comprises a stainless steel kettle body and a polytetrafluoroethylene lining.

[0010] According to one embodiment of the utility model, a vacuum pump is further arranged in parallel with the back pressure regulator.

[0011] According to one embodiment of the utility model, the reaction kettle is provided with a quartz visual window.

[0012] The technical scheme of the utility model has at least the following advantages and beneficial effects:

[0013] (1) The utility model provides an experimental device, which is equipped with a carbon dioxide gas cylinder (99.999% pure CO2) and a nitrogen gas cylinder (99.999% pure N2) for supplying high-purity CO2 and N2 respectively; N2 is introduced into the reaction kettle by a gas pump to create a controlled pressure environment, and the temperature and pressure conditions in the reaction kettle can be accurately controlled in combination with a magnetic stirring electric heating jacket and a back pressure regulator; This device is designed to simulate the high-temperature and high-pressure environment inside a geothermal well, and is particularly suitable for studying calcium carbonate scaling, providing a scientific basis for optimizing geothermal resource development, and helping to improve geothermal well production efficiency and extend equipment life; Unlike traditional low-temperature and low-pressure experimental devices, the utility model can meet the needs of online observation of calcium carbonate scaling process simulation of high-temperature and high-pressure geothermal fluids under degassing conditions, especially under different CO2 degassing rates.

[0014] (2)The utility model discloses a reaction kettle with quartz visual window, wherein the kettle body and kettle cover are made of stainless steel;Both the gas inlet pipe and the gas outlet pipe are equipped with valves, and temperature detector and pressure detector are installed, which are used for monitoring the reaction conditions;The device is designed to simulate the high temperature and high pressure environment in the geothermal wellbore and support the research of fluid reaction under these conditions;By accurately controlling the CO2 degassing rate, temperature and pressure and other key parameters, the actual working conditions of the geothermal wellbore can be more truly reproduced, thereby improving the accuracy of experimental data.

[0015] (3)The utility model discloses the imaging of short wave infrared camera, and this camera can capture short wave infrared radiation, realizes the process of real -time on -line monitoring calcium carbonate precipitation;This not only allows researchers to observe the position, morphology and quality change of precipitation, but also can analyze the sample characteristics after precipitation offline, provides powerful tool for understanding and predicting calcium carbonate fouling behavior. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical scheme of the embodiment of the utility model, the following will be briefly introduced to the drawing needed to be used in the embodiment, it should be understood that the following drawings only show some embodiments of the utility model, therefore should not be regarded as the limitation to the range, for ordinary skilled person in the art, under the premise of not paying the creative labor, can also obtain other related drawings according to these drawings.

[0017] Figure 1 The internal structure schematic diagram of the reaction device for simulating calcium carbonate precipitation under different CO2 degassing rates provided by the embodiment of the utility model;

[0018] Figure 2 The structure schematic diagram of the reaction device for simulating calcium carbonate precipitation under different CO2 degassing rates provided by the embodiment of the utility model;

[0019] Figure:

[0020] 100, reaction kettle;

[0021] 110, magnetic stirring electric heating jacket;

[0022] 200, carbon dioxide storage cylinder;

[0023] 300, nitrogen storage cylinder;

[0024] 400, tail gas recovery tank;

[0025] 500, gas pump;

[0026] 600, flowmeter;

[0027] 700, back pressure regulator;

[0028] 800, vacuum pump;

[0029] 900, short wave infrared camera;

[0030] 1000, pressure gauge. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme of the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, rather than all the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0032] Embodiment 1

[0033] The embodiments of the present application provide a reaction device for simulating calcium carbonate precipitation under different CO2 degassing rates, so as to simulate the high temperature and high pressure environment of a geothermal wellbore through experiments.

[0034] Please refer to Figure 1 The reaction device for simulating calcium carbonate precipitation under different CO2 degassing rates provided by the embodiments of the present application comprises a reaction kettle 100, an electric heating jacket is sleeved outside the reaction kettle 100, the reaction kettle 100 is provided with a gas inlet pipe and a gas outlet pipe, the gas inlet pipe is arranged below the liquid level in the reaction kettle 100, the gas outlet pipe is arranged above the liquid level in the reaction kettle 100, and the gas inlet pipe and the gas outlet pipe are both provided with valves. In the present embodiment, the gas inlet pipe is provided with a gas inlet valve, and the gas outlet pipe is provided with a gas outlet valve; a carbon dioxide storage cylinder 200 is connected to the gas inlet pipe through a gas pump 500, a valve is arranged between the carbon dioxide storage cylinder 200 and the gas pump 500, and the valve is a stop valve; a nitrogen storage cylinder 300 is connected to the gas inlet pipe through the gas pump 500, a valve is arranged between the nitrogen storage cylinder 300 and the gas pump 500, and the valve is a stop valve; an exhaust gas recovery tank 400 is connected to the gas outlet pipe through a back pressure regulator 700; a monitoring unit comprises a temperature detector, a pressure detector and a short wave infrared camera 900, and is respectively used for monitoring the temperature, pressure and reaction state in the reaction kettle 100; a central processing unit is electrically connected to the monitoring unit, the central processing unit is a single-chip microcomputer, and the central processing unit is electrically connected to the temperature detector, the pressure detector and the short wave infrared camera 900. In the present embodiment, the pressure detector is a pressure gauge 1000.

[0035] In the embodiment, the electric heating jacket is a magnetic stirring electric heating jacket 110 to realize temperature adjustment and magnetic stirring to ensure uniform mixing of the internal materials.

[0036] In the embodiment, a flow meter 600 is arranged between the gas pump 500 and the gas inlet pipe.

[0037] In the embodiment, a flow meter 600 is arranged between the back pressure regulator 700 and the tail gas recovery tank 400.

[0038] In the embodiment, the reaction kettle 100 includes a stainless steel kettle body and a polytetrafluoroethylene lining, and the reaction kettle 100 includes a stainless steel kettle body and a stainless steel kettle cover.

[0039] In the embodiment, the reaction kettle 100 is provided with a quartz visual window, which can be observed by the naked eye of an operator and a short-wave infrared camera.

[0040] In the embodiment, the gas pump 500 is provided with a flow control valve.

[0041] In the embodiment, a pressure reducing valve is arranged between the carbon dioxide storage cylinder 200 and the gas pump 500.

[0042] The use process of the reaction device for simulating calcium carbonate precipitation under different CO2 degassing rates in the embodiment 1 of the utility model will be described in detail as follows:

[0043] Step 1, first, connect the carbon dioxide storage cylinder 200 filled with high-purity carbon dioxide to the input end of the gas pump 500 through the stop valve and the pressure reducing valve in sequence, then connect the output end of the gas pump 500 to the gas inlet pipe of the reaction kettle 100 through the pipeline, and the gas inlet pipe is controlled by the gas inlet valve; then connect the gas outlet pipe of the reaction kettle 100 to the back pressure regulator 700, and the gas outlet pipe is controlled by the gas outlet valve; finally, connect the gas outlet end of the back pressure regulator 700 to the tail gas recovery tank 400, and place the reaction kettle 100 in the magnetic stirring electric heating jacket 110, check whether all the connecting parts are firm and reliable, and ensure that there is no leakage point.

[0044] Step 2, according to the actual high-temperature and high-pressure geothermal system to be simulated, determine the simulation temperature T and pressure P, add a proper amount of the prepared saturated Ca(OH)2 solution (saturation degree at the simulation temperature T) into the reaction kettle 100, keep the gas inlet pipe below the liquid level, and set the simulation temperature T of the reaction kettle 100 by using the magnetic stirring electric heating jacket 110; after the temperature in the reaction kettle 100 is stabilized, open the stop valve of the carbon dioxide storage cylinder 200 and slowly adjust the pressure reducing valve, open the gas inlet valve of the reaction kettle 100, and introduce CO2 gas.

[0045] Step 3, turn on the short wave infrared camera 900, and observe through the visual window of the reaction kettle 100, until the solution changes from clear to turbid and then to clear, then close the inlet valve, and observe the change of the pressure gauge 1000, ensure that the pressure is stable and does not exceed the bearing limit of the reaction kettle 100, open the nitrogen gas cylinder 300 stop valve, close the carbon dioxide gas cylinder 200 stop valve, adjust the flow control valve of the gas pump 500, and make N2 fill the reaction kettle 100 at an appropriate rate, gradually increase the pressure to the simulation pressure P of the reaction kettle 100, then close the inlet valve, open the back pressure regulator 700, and set a certain back pressure P`(P`<P), the size of the back pressure P` determines the degassing rate of CO2 in the reaction kettle 100, and the smaller the back pressure, the faster the degassing rate;

[0046] Step 4, open the outlet valve of the reaction kettle 100 to release the gas in the reaction kettle 100, and the released gas is recovered through the tail gas recovery tank 400, the tail gas recovery tank 400 is provided with an ammonia solution, and the experimental tail gas is recovered by using a chemical adsorption method, the formation characteristics of bubbles in the CO2 degassing process and the solution precipitation process are observed through the short wave infrared camera 900 and the visual window of the reaction kettle 100, and specific infrared absorption characteristics are generated in the calcium carbonate precipitation process, which can be detected by the short wave infrared camera 900, so that the observation and analysis of the calcium carbonate precipitation process are realized.

[0047] Embodiment 2

[0048] The reaction device for simulating calcium carbonate precipitation under different CO2 degassing rates provided in the embodiment of the utility model can simulate the high-temperature and high-pressure environment of a geothermal wellbore through experiments.

[0049] Please refer to Figure 2 The reaction device for simulating calcium carbonate precipitation under different CO2 degassing rates provided in the embodiment 2 of the utility model is different from the embodiment 1 only in that the embodiment further comprises a vacuum pump 800 connected in parallel with the back pressure regulator 700, the vacuum pump 800 is connected with the outlet pipe through a stop valve, and the back pressure regulator 700 is connected with the outlet pipe through a stop valve, when the gas is recovered, the stop valve between the vacuum pump 800 and the outlet pipe is opened, the stop valve between the back pressure regulator 700 and the outlet pipe is closed, and the gas in the reaction kettle 100 is pumped out through the vacuum pump 800, so that the gas is completely recovered.

[0050] The embodiment of the utility model has at least the following advantages:

[0051] (1) The utility model provides a kind of experimental apparatus, the device is equipped with carbon dioxide gas cylinder (99.999% purity CO2) and nitrogen gas cylinder (99.999% purity N2), for respectively supply high-purity CO2 and N2;N2 is introduced into reaction kettle by gas pump, to create a controlled pressure environment, in combination with magnetic stirring electric heating jacket and back pressure regulator, the temperature and pressure conditions in reaction kettle can be accurately controlled;This device aims to simulate the high temperature and high pressure environment inside geothermal wellbore, especially suitable for studying calcium carbonate fouling phenomenon, provides scientific basis for optimizing geothermal resource development, and helps to improve geothermal well production efficiency and prolong equipment life;Unlike traditional low-temperature low-pressure experimental device, the utility model can meet the needs of online observation of calcium carbonate fouling process simulation of high-temperature high-pressure geothermal fluid under degassing condition, especially the calcium carbonate precipitation process under different CO2 degassing rate.

[0052] (2) The utility model adopts the reaction kettle with quartz visual window, wherein kettle body and kettle cover are made of stainless steel;Gas inlet pipe and gas outlet pipe are equipped with valve, and temperature detector and pressure detector are installed, for monitoring reaction condition;The device is designed to simulate high temperature and high pressure environment in geothermal wellbore, and support fluid reaction research under these conditions;By accurately regulating CO2 degassing rate, temperature and pressure and other key parameters, the actual working conditions of geothermal wellbore can be more realistically reproduced, so as to improve the accuracy of experimental data.

[0053] (3) The utility model utilizes shortwave infrared camera to image, which can capture shortwave infrared radiation, realize real-time online monitoring of calcium carbonate precipitation process;This not only allows researchers to observe the location, morphology and quality change of precipitation, but also can analyze the sample characteristics after precipitation offline, provides a powerful tool for understanding and predicting calcium carbonate fouling behavior.

[0054] The above is only preferred embodiment of the utility model, and is not used to limit the utility model, for the person skilled in the art, the utility model can have various changes and changes. Any modification, equivalent replacement, improvement etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A reaction apparatus for simulating precipitation of calcium carbonate at different CO2 degassing rates, characterized by, The utility model relates to a reaction kettle, a magnetic stirring electric heating jacket, a gas pump, a back pressure regulator, a tail gas recovery tank, a monitoring unit and a central processing unit. The utility model relates to a reaction kettle, a magnetic stirring electric heating jacket, a gas pump, a back pressure regulator, a tail gas recovery tank, a monitoring unit and a central processing unit. The utility model relates to a reaction kettle, a magnetic stirring electric heating jacket, a gas pump, a back pressure regulator, a tail gas recovery tank, a monitoring unit and a central processing unit. The utility model relates to a reaction kettle, a magnetic stirring electric heating jacket, a gas pump, a back pressure regulator, a tail gas recovery tank, a monitoring unit and a central processing unit. The utility model relates to a reaction kettle, a magnetic stirring electric heating jacket, a gas pump, a back pressure regulator, a tail gas recovery tank, a monitoring unit and a central processing unit. The utility model relates to a reaction kettle, a magnetic stirring electric heating jacket, a gas pump, a back pressure regulator, a tail gas recovery tank, a monitoring unit and a central processing unit. The utility model relates to a reaction kettle, a magnetic stirring electric heating jacket, a gas pump, a back pressure regulator, a tail gas recovery tank, a monitoring unit and a central processing unit.

2. The reaction apparatus for simulating precipitation of calcium carbonate under different CO2 degassing rates according to claim 1, characterized in that, The utility model relates to a reaction kettle, a magnetic stirring electric heating jacket, a gas pump, a back pressure regulator, a tail gas recovery tank, a monitoring unit and a central processing unit.

3. The reaction device for simulating the precipitation of calcium carbonate under different CO2 degassing rates according to claim 1, characterized in that, The utility model relates to a reaction kettle, a magnetic stirring electric heating jacket, a gas pump, a back pressure regulator, a tail gas recovery tank, a monitoring unit and a central processing unit.

4. The reaction device for simulating the precipitation of calcium carbonate under different CO2 degassing rates according to claim 1, characterized in that, The utility model relates to a reaction kettle, a magnetic stirring electric heating jacket, a gas pump, a back pressure regulator, a tail gas recovery tank, a monitoring unit and a central processing unit.

5. The reaction apparatus for simulating precipitation of calcium carbonate under different CO2 degassing rates according to claim 1, characterized in that, ​ 6. The reaction apparatus for simulating precipitation of calcium carbonate under different CO2 degassing rates according to claim 1, characterized in that, ​ 7. The reaction apparatus for simulating precipitation of calcium carbonate under different CO2 degassing rates according to any one of claims 1 to 6, characterized in that, ​

Images