A test device and method for the starting saturation of liquid sulfur

Abstract

The present invention belongs to the field of testing seepage characteristics, and particularly relates to a testing device and method for the starting saturation of liquid sulfur. The testing device includes: a core device, a gas-liquid sulfur injection device, a heating device, a liquid sulfur detection device, and a liquid sulfur displacement adjustment device. The liquid sulfur displacement adjustment device is connected in series between the gas-liquid sulfur injection device and the core device and is used to adjust the displacement speed of liquid sulfur entering the core. When the displacement speed of liquid sulfur exceeds a specific range, the displacement speed of liquid sulfur is adjusted to the specific range. The testing device for the starting saturation of liquid sulfur according to the present invention can stably increase the sulfur saturation of the core at a stable displacement speed, avoid the situation of instantly reaching the starting saturation of liquid sulfur, and thus accurately determine the starting saturation node of liquid sulfur. The testing process can be fully automated through remote control by a computer, improving the testing accuracy.

Description

Technical Field

[0001] The present invention belongs to the field of testing seepage characteristics, and particularly relates to a testing device and method for the starting saturation of liquid sulfur. Background Art

[0002] There are a relatively large number of high-H2S gas reservoirs in China, such as the Feixianguan Formation of the Lower Triassic and the Changxing Formation of the Upper Permian gas reservoirs in the northeastern part of the Sichuan Basin, the Feixianguan Formation gas reservoir in the Dukouhe Gas Field, the Feixianguan Formation gas reservoir in the Luojiazhai Gas Field, and the Changxing Formation gas reservoir in the Yuanba area of northern Sichuan. In the original state, elemental sulfur is dissolved in high-H2S natural gas. As the pressure and temperature decrease during the exploitation of the gas reservoir, the ability of high-H2S natural gas to dissolve elemental sulfur gradually decreases, and sulfur begins to precipitate when the saturation state is reached. When the formation temperature exceeds the melting point of elemental sulfur, the precipitated sulfur exists in a liquid state. Liquid sulfur will adsorb on the surface of porous media, reducing the seepage ability of formation pore media, resulting in a decrease in the effective gas-phase permeability, and thus affecting the productivity of gas wells.

[0003] When the pores of reservoir rocks are filled with one kind of fluid, it is called saturated with one kind of fluid. When there are multiple fluids (gas and liquid sulfur) simultaneously in the pores of reservoir rocks, the percentage of pore volume occupied by a certain fluid is called the saturation of this fluid, which characterizes the degree to which the pore space is occupied by a certain fluid. The starting saturation of liquid sulfur is the saturation when the precipitated liquid sulfur accumulates to a certain amount in the core and begins to flow.

[0004] After the gas reservoir changes from single-phase flow to gas-liquid two-phase flow, the gas-phase permeability decreases, thus affecting the ultimate recovery rate of the gas reservoir. By determining the starting saturation of liquid sulfur, it is possible to determine when liquid sulfur begins to participate in seepage, clarify the timing of the change from single-phase gas seepage to gas-liquid-sulfur two-phase seepage in the formation, and accordingly formulate sulfur control countermeasures at different development stages. Therefore, this parameter is of great significance for studying sulfur deposition damage in high-H2S gas reservoirs and for formulating effective sulfur control countermeasures.

[0005] Although the standard "SY / T5345-2007 Determination Method for Relative Permeability of Two-Phase Fluids in Rocks" stipulates the experiments and determination methods for the relative permeability of two-phase fluids, the experimental device involved in it for measuring the relative permeability of two-phase fluids cannot accurately measure when the liquid sulfur in high-H2S natural gas reaches the starting saturation. Summary of the Invention

[0006] The purpose of the present invention is to provide a testing device for the starting saturation of liquid sulfur, which can achieve the determination of the starting saturation of liquid sulfur.

[0007] The second purpose of the present invention is to provide a testing method for the starting saturation of liquid sulfur.

[0008] To achieve the above purposes, the technical solutions adopted by the present invention are as follows:

[0009] A test device for the starting saturation of liquid sulfur, comprising:

[0010] A core device, used to simulate the formation environment and for the injection of two phases of displacement gas and liquid sulfur; the core device has an inlet and an outlet;

[0011] A gas-liquid sulfur injection device, connected to the inlet of the core device, for injecting displacement gas and liquid sulfur into the core device;

[0012] A liquid sulfur displacement regulating device, connected in series between the gas-liquid sulfur injection device and the core device, for regulating the displacement speed of liquid sulfur entering the core. When the displacement speed of liquid sulfur exceeds a specific range, the displacement speed of liquid sulfur is adjusted to the specific range;

[0013] A heating device, heating the parts of the core device, gas-liquid sulfur injection device, and liquid sulfur displacement regulating device through which liquid sulfur flows, so that the liquid sulfur remains in a liquid and flowable state;

[0014] A liquid sulfur detection device, connected to the outlet of the core device, for detecting the displaced liquid sulfur.

[0015] The test device for the starting saturation of liquid sulfur of the present invention can stably increase the sulfur saturation of the core at a stable displacement speed, avoid the situation of instantly reaching the starting saturation of liquid sulfur, and thus accurately determine the starting saturation node of liquid sulfur.

[0016] The specific range is a numerically set range by humans, which can be a certain range of floating up and down around the desired theoretical displacement speed, such as floating up and down by 5%, to achieve the above goal. The floating range can be determined according to the actual situation. The larger the floating range, the simpler the corresponding control process, but the experimental error will increase accordingly; the smaller the floating range, the opposite.

[0017] For the sake of simplifying the monitoring and adjustment of the displacement speed, preferably, the liquid sulfur displacement regulating device includes an observation container, which has a displacement gas inlet, a displacement gas outlet, a liquid sulfur inlet, and a liquid sulfur outlet. The displacement gas inlet and the liquid sulfur inlet are respectively connected in correspondence with the gas source and liquid sulfur source of the gas-liquid sulfur injection device. The displacement gas outlet and the liquid sulfur outlet are respectively connected to the inlet of the core device through connecting pipes, and a regulating valve is provided on the connecting pipe; observe the liquid level formed by the displacement gas and liquid sulfur in the observation container. When the liquid level fluctuates beyond a specific range, adjust the opening degree of the regulating valve to make the liquid level return to the specific range.

[0018] To achieve the automatic control of the monitoring and regulation process, preferably, the liquid sulfur displacement regulating device further includes a controller and a liquid level detection device for detecting the liquid level in the observation container. The liquid level detection device, the regulating valve, and the controller are signal-connected to achieve the automatic regulation of the regulating valve. The test process can be fully automated through remote control by a computer, improving the test accuracy.

[0019] Further preferably, the liquid level detection device includes a light generator and a light receiver disposed on opposite sides of the observation container. When the liquid level in the observation container changes, the light intensity received by the light receiver changes correspondingly and feeds back a liquid level signal to the controller. A light intensity test method can be adopted to further improve the sensitivity and accuracy of the detection.

[0020] To facilitate the continuous progress of the experiment, the liquid sulfur detection device includes a liquid sulfur collection container and a weighing device. The liquid sulfur collection container is connected to the outlet of the core device to receive the liquid sulfur flowing out of the core device; the weighing device is used to detect the weight of the liquid sulfur collection container, and it is judged whether liquid sulfur flows out by detecting the weight change.

[0021] To achieve the relative independence of the liquid sulfur detection device, preferably, a heater is provided on the connecting pipeline between the outlet of the core device and the liquid sulfur collection container. The heater heats the connecting pipeline to prevent the liquid sulfur from solidifying.

[0022] Further preferably, the liquid sulfur collection container has a tail gas outlet, and the tail gas outlet is connected to a tail gas purification device. Under high-temperature conditions, liquid sulfur is prone to chemical reactions with air to generate toxic gases. Using a tail gas treatment device to purify the tail gas can achieve the up-to-standard discharge of the tail gas. The tail gas purification device is an alkali solution treatment device, and the alkali solution therein can be NaOH solution.

[0023] The technical solution of the test method for the liquid sulfur starting saturation of the present invention is as follows:

[0024] A test method for the liquid sulfur starting saturation includes the following steps: alternately injecting a displacement gas and liquid sulfur into the core or injecting a displacement gas and liquid sulfur simultaneously, adjusting the displacement speed of the liquid sulfur in real time according to the injection resistance, stabilizing the displacement speed of the liquid sulfur within a specific range, and steadily increasing the sulfur saturation of the core; when it is monitored that liquid sulfur is just displaced from the outlet of the core, detecting the liquid sulfur saturation of the core at this time to obtain the liquid sulfur starting saturation.

[0025] In the test method for the liquid sulfur starting saturation of the present invention, by adjusting the displacement speed of the liquid sulfur, the displacement speed of the liquid sulfur fluctuates within a specific range. This specific range can avoid the situation of instantly reaching the liquid sulfur starting saturation, the injected liquid sulfur steadily increases, and the displacement end point is steadily presented, which is beneficial to quickly and accurately obtain the test results.

[0026] The method of adjusting the displacement speed of liquid sulfur in real time according to the injection resistance is as follows: first, the displacement gas and liquid sulfur are respectively injected into an observation container, then flow out of the observation container respectively, and then enter the core; when the resistance to injection into the core changes, the liquid level formed by the displacement gas and liquid sulfur in the observation container jumps accordingly, and by judging whether the liquid level exceeds a specific range, it is judged whether the displacement speed of liquid sulfur exceeds the specific range; when the liquid level jumps beyond the specific range, the flow rate of liquid sulfur entering the core from the observation container is adjusted to make the displacement speed of liquid sulfur return to the specific range.

[0027] When alternately injecting displacement gas and liquid sulfur, the displacement volume of liquid sulfur decreases with the number of alternations. The displacement process gradually increases sulfur saturation. To improve displacement efficiency, a larger displacement volume can be used initially. As the liquid sulfur starts to reach saturation, the displacement volume can be reduced to improve the accuracy of the test results. There are no specific restrictions on how the displacement volume can be reduced. For example, it can be a gradual reduction, or multiple larger-volume displacements (each with equal volume) followed by multiple smaller-volume displacements (each with equal volume).

[0028] There are two ways to test:

[0029] First, liquid sulfur and displacement gas are not injected simultaneously; liquid sulfur is displaced into the core in multiple times, and displacement gas is used after each injection of liquid sulfur. Preferably, the displacement volume of liquid sulfur decreases as the number of liquid sulfur displacements increases.

[0030] The second is to inject displacement gas and liquid sulfur into the core simultaneously.

[0031] Of the two methods mentioned above, Method 1 requires a longer test time, but the results obtained are more accurate. Method 2 has a shorter test time, but because the displacement gas may carry more liquid sulfur, the liquid sulfur may be detected earlier, and the accuracy of the test results may be slightly lower than that of Method 1. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a schematic structural diagram of a device for testing liquid sulfur startup saturation according to an embodiment of the present invention;

[0033] Among them, 1 - core, 2 - core holder, 3 - confining pressure pump, 4 - back pressure pump, 5 - first intermediate container, 6 - back pressure valve, 7 - observation container, 70 - displacement gas output channel, 71 - liquid sulfur output channel, 700 - first electric throttle valve, 710 - second electric throttle valve, 8 - light generator, 9 - light receiver, 10 - computer, 11 - gas-sulfur mixer, 12 - pressure gauge, 13 - differential pressure gauge, 14 - gas delivery pump, 15 - second intermediate container, 16 - liquid sulfur pump, 17 - third intermediate container, 18 - high-precision electronic balance, 19 - gas-sulfur separator, 20 - gas flowmeter, 21 - absorption bottle, 22 - oven, 220 - oven vent, 23 - closed box, 230 - closed box vent, 24 - heating tape. Specific Embodiment

[0034] The following further elaborates on the embodiments of the present invention in conjunction with the accompanying drawings.

[0035] I. Specific Example of the Test Device for the Liquid Sulfur Starting Saturation of the Present Invention

[0036] Experimental Example 1

[0037] The test device for the liquid sulfur starting saturation in this embodiment has a structural schematic diagram as Figure 1 shown, and includes a core device, a gas-liquid sulfur injection device, a liquid sulfur displacement adjustment device, a liquid sulfur detection device, a heating device, and a tail gas treatment device.

[0038] The core device includes a core 1, a core holder 2, a confining pressure pump 3 for applying confining pressure to the core holder 2, and a back pressure device for applying back pressure to the core outlet. The back pressure device includes a back pressure pump 4, a first intermediate container 5, and a back pressure valve 6 connected in sequence.

[0039] The liquid sulfur displacement adjustment device includes an observation container 7. The observation container 7 is partially transparent, and this transparent part forms an annular observation window. A light generator 8 and a light receiver 9 are correspondingly arranged on both sides of the annular observation window. The annular observation window allows the light from the light generator 8 to pass through and be received by the light receiver 9. The light emitted by the light generator 8 has a certain beam width. When the liquid level in the observation container 7 changes, the light intensity received by the light receiver 9 changes accordingly.

[0040] The observation container 7 is a cylindrical container sealed at both ends, including a top wall, a bottom wall, and a cylindrical side wall. A displacement gas inlet and a liquid sulfur inlet are respectively arranged on the top wall and the bottom wall. The upper and lower ends of the cylindrical side wall are respectively connected to a displacement gas output channel 70 and a liquid sulfur output channel 71. A first electric throttle valve 700 and a second electric throttle valve 710 are correspondingly arranged on the two output channels.

[0041] The light receiver 9, the first electric throttle valve 700, and the second electric throttle valve 710 are signal-connected to a control module, which includes a computer 10. The computer 10 receives the light intensity signal from the light receiver 9. Liquid level fluctuations have a specific range. If the liquid level fluctuations exceed the lower limit, the light intensity exceeds the corresponding fluctuation range, indicating that the light intensity is too high and the liquid level is dropping too quickly. In this case, the computer 10 issues a command to the first electric throttle valve 700 and / or the second electric throttle valve 710 to adjust the opening and closing of the electric throttle valves to achieve the purpose of regulating the displacement speed of liquid sulfur.

[0042] Through the above monitoring and control actions on the gas-liquid sulfur interface, the displacement rate of liquid sulfur can be made to fluctuate within a very small range, and timely adjustments can be made when larger fluctuations occur. This not only avoids the situation where the liquid sulfur reaches the starting saturation instantly, but also avoids the adverse interference of the displacement rate on the judgment of the starting saturation endpoint.

[0043] After the displacement gas output channel 70 and the liquid sulfur output channel 71 merge through the gas-sulfur mixer 11, they are connected to the core device's inlet via a confluence pipe. This confluence pipe is equipped with a pressure gauge 12. The core device's inlet and outlet are connected to the confluence pipe and a back-pressure valve, respectively. A differential pressure gauge 13 is also connected to the core device's inlet and outlet.

[0044] The gas-liquid sulfur injection device includes a displacement gas delivery device and a liquid sulfur delivery device. The displacement gas delivery device includes a gas delivery pump 14 and a second intermediate container 15. The liquid sulfur delivery device includes a liquid sulfur pump 16 and a third intermediate container 17.

[0045] The liquid sulfur detection device includes a high-precision electronic balance 18 and a gas-sulfur separator 19. The gas-sulfur separator has a liquid sulfur inlet and a tail gas outlet. The liquid sulfur inlet is connected to the liquid sulfur outlet of the back-pressure valve. The tail gas outlet is connected in sequence to a gas flowmeter 20 and a tail gas treatment device. The tail gas treatment device is an absorption bottle 21 filled with NaOH solution.

[0046] The heating device is an oven 22 . The liquid sulfur source in the core device, liquid sulfur displacement adjustment device, and gas-liquid sulfur injection device is arranged in the oven 22 to ensure that the liquid sulfur is in a liquid flowable state. The oven 22 is provided with an oven vent 220 .

[0047] The liquid sulfur detection device and tail gas treatment device are housed within a closed box 23, which is provided with a closed box vent 230. A heating belt 24 is installed in the connection zone between the liquid sulfur inlet of the liquid sulfur detection device and the liquid sulfur outlet of the back-pressure valve to heat the liquid sulfur and maintain a fluid state.

[0048] The setting of the drying oven and the closed box improves the safety of the device. Outside the drying oven and the closed box, it only needs to be connected to the pump module and the controller module to conveniently realize the test of the liquid sulfur startup saturation.

[0049] In other embodiments of the test device for the liquid sulfur startup saturation of the present invention, an existing liquid level sensor can be used to replace the above-mentioned light generator and light receiver to monitor the liquid level.

[0050] II. Specific embodiments of the test method for the liquid sulfur startup saturation of the present invention

[0051] Embodiment 2

[0052] The test method for the liquid sulfur startup saturation in this embodiment includes the following steps:

[0053] S1. Select an experimental core, extract, dry, and clean the core according to corresponding standards. After the treatment, measure the length L, diameter d, mass m, porosity, and permeability K of the core sample, and calculate the pore volume of the core.

[0054] S2. Install the test core into a core holder, heat the experimental device to a specified temperature using an oven, turn on the exhaust fan at the ventilation opening, connect the data acquisition device and debug it.

[0055] S3. Use a computer to control a high-pressure pump group to apply confining pressure and back pressure, and the confining pressure and back pressure exist and remain unchanged throughout the same experiment.

[0056] S4. At the same time, set the flow rate, and use a high-pressure pump to displace an intermediate container filled with gas and liquid sulfur (the gas and sulfur enter their respective pipelines and flow to a high-temperature and high-pressure-resistant container with an observation window. At this time, the electric throttle valves at both ends of the gas and liquid sulfur are closed), and the gas-liquid sulfur interface generated is located at the middle position of the observation window.

[0057] S5. Turn on the light generator, and the light generator generates a light beam that irradiates on the light sensor. When the generated gas-liquid sulfur interface completely blocks the observation window, the value of the light receptor is R max , when there is no blockage, the value of the light receptor is R0, and when the gas-liquid sulfur interface is located at the middle position of the observation window, the value of the light receptor is R 中 , the light sensor converts the received light intensity signal into an electrical signal and then transmits the electrical signal to the computer.

[0058] Set the value of the light receptor R 中 as the initial state. Before displacement (the electric throttle valves at both ends of the gas and liquid sulfur are closed), the system automatically establishes the initial state through the forward and backward movement of the liquid sulfur pump and the gas delivery pump.

[0059] The initial state can be established through the above steps S4 - S5.

[0060] S6. Open the electric throttle valve at the liquid sulfur end and set the displacement volume of the liquid sulfur displacement pump to drive the liquid sulfur into the pipeline. During the displacement process, since the liquid level cannot remain completely unchanged, the light intensity signal is allowed to be within a certain range (R 中 ±5%R max ) fluctuates, when the interface rises, the light receptor value exceeds R 中 +5%R max At this time, the liquid sulfur flow rate is increased by controlling the electric throttle valve; when the interface drops, the light receptor value is lower than R 中 -5%R max At this time, the electric throttle valve is controlled to reduce the liquid sulfur flow rate.

[0061] S7. Close the electric throttle valve at the liquid sulfur end and open the electric throttle valve at the gas end to drive the gas into the core at the pressure required by the experiment.

[0062] S8. After a period of displacement, when the pressure gauge fluctuates within a very small range and the differential pressure gauge reading is basically 0, it is considered stable. At this time, if the electronic balance does not measure liquid sulfur, close the electric throttle valve on the gas side and open the electric throttle valve on the liquid sulfur side;

[0063] S9. Repeat steps S6-S8; in order to ensure the accuracy of the experimental determination of liquid sulfur startup saturation, the liquid sulfur displacement volume set in subsequent experiments can be reduced to.

[0064] S10. Stop the experiment when the high-precision electronic balance just measures sulfur.

[0065] Steps S6-S10 illustrate the adjustment process after the initial state.

[0066] In step S6, set V p *5% displacement is to save time. p *5% displacement, the final test result is inaccurate (too large). If you always use a smaller volume (such as V p *1%), the efficiency is too low, so you can choose to start with a larger displacement volume, and then gradually reduce the displacement volume, which will not only give accurate results but also high efficiency. p *5% displacement volume displacement 3 to 5 times, then V p *1% displacement volume until the end of the experiment.

[0067] S11. Take out the core and weigh it, and calculate the liquid sulfur saturation of the core by weight method, which is the liquid sulfur starting saturation in the core.

[0068] The above method essentially adopts the method of injecting liquid sulfur and displacement gas not simultaneously; the liquid sulfur is displaced into the core in multiple times, and after each injection of liquid sulfur, it is displaced with displacement gas. The displacement speed of liquid sulfur is adjusted in real time according to the injection resistance, and the displacement speed is stabilized within a specific range to steadily increase the sulfur saturation of the core; when it is monitored that the liquid sulfur is just displaced at the core outlet, the liquid sulfur startup saturation of the core is reached.

[0069] Example 3

[0070] The test method for the liquid sulfur startup saturation in this example includes the following steps:

[0071] S1 - S5 are the same as in Example 2.

[0072] S6. Open the electric throttle valves at both ends.

[0073] S7. Set the displacement volume (displacement speed) of the high - pressure pump at the liquid sulfur end per minute. On the premise of ensuring that the gas - liquid sulfur interface does not move, select a suitable gas displacement speed, and displace the displacement gas and liquid sulfur into the pipeline. During this period, it is necessary to ensure that the displacement volumes of the gas and liquid sulfur are certain and the speed is very small to avoid the situation of reaching the liquid sulfur startup saturation instantaneously. Since the liquid level cannot be completely kept unchanged, the light intensity signal is allowed to fluctuate within a certain range. When it exceeds this range, the computer controls the flow rate by controlling the electric throttle valve. When the light intensity signal becomes weak, it means that the liquid level rises. At this time, the gas flow rate is increased by controlling the electric throttle valve at the gas end. While ensuring that the displacement volume is certain, the situation of reaching the liquid sulfur startup saturation instantaneously cannot occur.

[0074] S8. Stop the experiment when the high - precision electronic balance just measures sulfur.

[0075] S9. Take out the core and weigh it, and calculate the liquid sulfur saturation of the core by the gravimetric method, which is the liquid sulfur startup saturation in the core.

[0076] In the example, according to the specific core conditions, the displacement speeds of the liquid sulfur pump and the gas delivery pump are set to be certain, and the liquid sulfur displacement adjustment device in the example can maintain the speeds of the liquid sulfur and gas actually injected into the core.

[0077] In the above examples, when calculating the startup saturation, the pipeline volume where the liquid sulfur may exist from the observation container to the front end of the core holder is checked. The whole experimental process is completely closed, and the tail gas is treated to eliminate the harm brought by the sulfur - containing gas to the experimental operators.

Claims

1. A device for testing liquid sulfur startup saturation, characterized in that: include: Core device, used to simulate the formation environment and provide two-phase injection of displacement gas and liquid sulfur; The core device has an inlet and an outlet; a gas-liquid sulfur injection device, connected to the inlet of the core device, for injecting displacement gas and liquid sulfur into the core device; A liquid sulfur displacement regulating device is connected in series between the gas-liquid sulfur injection device and the core device, and is used to regulate the displacement speed of liquid sulfur into the core. When the displacement speed of liquid sulfur exceeds a specific range, the displacement speed of liquid sulfur is adjusted to a specific range; the liquid sulfur displacement regulating device includes an observation container, the observation container has a displacement gas inlet, a displacement gas outlet, a liquid sulfur inlet and a liquid sulfur outlet, the displacement gas inlet and the liquid sulfur inlet are respectively connected to the gas source and the liquid sulfur source of the gas-liquid sulfur injection device, and the displacement gas outlet and the liquid sulfur outlet are respectively connected to the liquid sulfur source through a connecting pipe. The inlet of the core device is connected, and a regulating valve is provided on the connecting pipe; the liquid level formed by the displacement gas and liquid sulfur in the observation container is observed, and when the liquid level fluctuates beyond a specific range, the opening and closing degree of the regulating valve is adjusted to return the liquid level to the specific range; the liquid sulfur displacement regulating device includes a liquid level detection device for detecting the liquid level in the observation container; the liquid level detection device includes a light generator and a light receiver disposed on opposite sides of the observation container. When the liquid level in the observation container changes, the light intensity received by the light receiver changes accordingly and feeds back a liquid level signal to the controller; A heating device for heating the portion of the core device, the gas-liquid sulfur injection device, and the liquid sulfur displacement regulating device through which the liquid sulfur flows, so as to keep the liquid sulfur in a liquid and flowable state; The liquid sulfur detection device is connected to the outlet of the core device and is used to detect the displaced liquid sulfur.

2. The liquid sulfur startup saturation testing device according to claim 1, characterized in that: The liquid sulfur displacement regulating device also includes a controller, and the liquid level detection device and the regulating valve are connected to the controller signal to realize automatic regulation of the regulating valve.

3. The liquid sulfur startup saturation testing device according to claim 1 or 2, characterized in that: The liquid sulfur detection device includes a liquid sulfur collection container and a weighing device. The liquid sulfur collection container is connected to the outlet of the core device and receives the liquid sulfur flowing out of the core device. The weighing device is used to detect the weight of the liquid sulfur collection container. The weighing device detects the weight change to determine whether liquid sulfur has flowed out.

4. The liquid sulfur startup saturation testing device according to claim 3, characterized in that: A heater is provided on the connecting pipeline between the outlet of the core device and the liquid sulfur collecting container, and the heater heats the connecting pipeline to prevent the liquid sulfur from solidifying.

5. The liquid sulfur startup saturation testing device according to claim 3, characterized in that: The liquid sulfur collecting container is provided with a tail gas outlet, and the tail gas outlet is connected to the tail gas purification device.

6. A method for testing liquid sulfur startup saturation, characterized in that: The liquid sulfur starting saturation testing device according to any one of claims 1 to 5 comprises the following steps: alternately injecting displacement gas and liquid sulfur or injecting displacement gas and liquid sulfur simultaneously into the core, adjusting the displacement speed of liquid sulfur in real time according to the injection resistance, stabilizing the displacement speed of liquid sulfur within a specific range, and stably improving the sulfur saturation of the core; when it is monitored that liquid sulfur is just displaced from the core outlet, detecting the liquid sulfur saturation of the core at this time to obtain the liquid sulfur starting saturation.

7. The method for testing liquid sulfur startup saturation according to claim 6, characterized in that: The real-time adjustment of the displacement speed of liquid sulfur according to the injection resistance is as follows: first, the displacement gas and liquid sulfur are respectively injected into an observation container, and then flow out of the observation container and enter the core; when the injection resistance of the core changes, the liquid level formed by the displacement gas and liquid sulfur in the observation container jumps accordingly, and by judging whether the liquid level exceeds a specific range, it is judged whether the displacement speed of liquid sulfur exceeds the specific range; When the liquid level jumps beyond a specific range, the flow rate of liquid sulfur from the observation container into the core is adjusted to bring the displacement rate of liquid sulfur back into the specific range.

8. The method for testing liquid sulfur startup saturation according to claim 6, wherein: When the displacement gas and liquid sulfur are injected alternately, the displacement volume of liquid sulfur decreases as the number of alternations increases.

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