Online sulfur dissolving evaluation device and sulfur dissolving evaluation method

Abstract

The invention discloses an online sulfur dissolving evaluation device and a sulfur dissolving evaluation method, and relates to the technical field of gas field development evaluation. The online sulfur dissolving evaluation device comprises a sulfur dissolving reaction unit, a gas supply unit, a feeding unit, a liquid pumping unit and a circulating unit, the sulfur dissolving reaction unit comprises a reaction cylinder, the reaction cylinder is provided with a heating piece and a spiral flow channel piece, the gas supply unit is provided with a first pipeline, the circulating unit comprises a gas-liquid two-phase separator, the gas-liquid two-phase separator is provided with a recovery pipeline, a gas pipe and a liquid pipe, the first pipeline is provided with a pressure gauge I, and the recovery pipeline is provided with a pressure gauge II. The sulfur dissolving evaluation method comprises the following steps: firstly forming a sulfur deposition site, then introducing a sulfur dissolving agent, and finally carrying out sulfur dissolving evaluation according to a pressure difference change condition. And the circulating unit is opened to collect the water sample, and the amount of dissolved solids is obtained to evaluate the dissolved sulfur. The online sulfur dissolving evaluation device and the sulfur dissolving evaluation method have the advantages of being accurate in environment simulation, good in reflecting condition simulation effect and accurate in effect evaluation.

Description

Technical Field

[0001] This invention relates to the field of gas field development evaluation technology, specifically to an online sulfur dissolution evaluation device and method. Background Technology

[0002] Based on the development experience of high-sulfur gas fields at home and abroad, as the extraction process progresses, the temperature and pressure of natural gas will inevitably decrease from the formation to the wellbore to the wellhead. Consequently, the solubility of elemental sulfur in natural gas will decrease. When the sulfur content in the high-sulfur gas reaches saturation, sulfur crystals will precipitate. Elemental sulfur is prone to deposit in the production layer, wellbore, and gathering and transportation system, causing sulfur blockage, which directly affects the production of gas wells and may even lead to the shutdown of gas wells.

[0003] To address the above situation, a common method for resolving sulfur deposition and blockage is the sulfur dissolution method using sulfur-dissolving agents. The evaluation method for sulfur dissolution is crucial to the selection of the sulfur dissolution method or agent. Existing sulfur dissolution evaluation devices are not suitable for online sulfur dissolution evaluation. For example, CN106706465B discloses a sulfur-dissolving agent evaluation device and its usage method. Although this device simulates the gas and pressure environments at the bottom of the gas well and in the production manifold, it has the following problems:

[0004] (1) It is impossible to accurately simulate the location of sulfur deposition, the degree of sulfur deposition consolidation, and the tubing environment during the online injection process in the wellbore or gathering and transportation system;

[0005] (2) It is impossible to simulate the contact reaction between the sulfur solvent and the deposited sulfur;

[0006] (3) After the reaction is completed, the process and steps of calculating the amount of sulfur powder dissolved before and after the reaction using the differential method are complicated and easy to increase the error. It is inconvenient to use the differential method to evaluate the effect of the online sulfur dissolution process on site.

[0007] Therefore, existing technologies need to be improved. Summary of the Invention

[0008] The technical problem to be solved by this invention is that the environmental simulation is inaccurate, the simulation effect of reflecting the situation is poor, and the effect evaluation error is large. The purpose is to provide an online sulfur dissolution evaluation device and sulfur dissolution evaluation method, which adopts corresponding technical means and has the advantages of accurate environmental simulation, good simulation effect of reflecting the situation, and accurate effect evaluation.

[0009] This invention is achieved through the following technical solution:

[0010] In a first aspect, the present invention provides an online sulfur dissolution evaluation device, which includes a sulfur dissolution reaction unit, a gas supply unit, a feeding unit, a liquid pumping unit, and a circulation unit;

[0011] The sulfur dissolving reaction unit includes a reaction cylinder equipped with a heating element to raise the internal temperature, and the interior of the reaction cylinder is provided with multiple spiral flow channels.

[0012] The gas supply unit is provided with a first pipe connected to multiple spiral flow channel components. The inlet and outlet of the feeding unit are both connected to the first pipe. The liquid pumping unit is connected to the first pipe. The circulation unit includes a gas-liquid two-phase separator. The inlet end of the gas-liquid two-phase separator is provided with a recovery pipe connected to multiple spiral flow channel components. The outlet end of the gas-liquid two-phase separator is provided with a gas pipe connected to the gas supply unit and a liquid pipe connected to the liquid pumping unit.

[0013] The first pipeline is equipped with a pressure gauge one, and the recovery pipeline is equipped with a pressure gauge two.

[0014] Furthermore, in this invention, the gas supply unit includes a gas source component connected to the gas pipe, the gas source component is connected to a gas control valve, the gas control valve is connected to a gas booster, and the gas booster is connected to the inlet of the first pipe.

[0015] Furthermore, in this invention, the inlet of the above-mentioned feeding unit is provided with a valve.

[0016] Furthermore, in this invention, the liquid injection unit includes a liquid pump connected to the liquid pipe, the liquid pump is connected to a liquid tank one and a liquid tank two, the liquid pump is connected to the first pipe, and the outlet of the liquid pump is provided with a valve two.

[0017] Furthermore, in this invention, the first pipeline is provided with valve three, which is located downstream of the inlet connection of the feeding unit and upstream of the outlet connection of the liquid pump.

[0018] Furthermore, in this invention, the first pipe is provided with a four-way connector connected to the spiral flow channel component, and the recovery pipe is provided with a four-way connector connected to the spiral flow channel component.

[0019] Furthermore, in this invention, the aforementioned recovery pipeline is equipped with valve four, which is located downstream of pressure gauge two.

[0020] Furthermore, in this invention, the heating element is configured as an annular heating element 102 surrounding the spiral flow channel element, and the annular heating element 102 is electrically connected to a temperature controller.

[0021] Furthermore, in this invention, the liquid pipe is connected to a flow-stabilizing storage tank.

[0022] Secondly, the present invention also provides a method for evaluating sulfur dissolution, which employs an online sulfur dissolution evaluation device and further includes the following methods.

[0023] The gas supply unit is connected to the feeding unit, and the inlet of the circulation unit is closed. The gas supplied by the gas supply unit flows through the feeding unit, and after blowing the solid powder in the feeding unit into the spiral flow channel of the reaction cylinder, the gas supply unit is closed.

[0024] Turn on the heating element to adjust the temperature in the reaction chamber to the predetermined value and continue heating for the predetermined time;

[0025] Then close the inlet of the feeding unit and open the inlet of the circulation unit; the gas-liquid two-phase separator starts working; turn on the gas supply unit and adjust the gas to the predetermined flow rate;

[0026] Turn on the liquid pumping unit to add the liquid in liquid tank one into the first pipeline; the liquid and gas form a gas-liquid mixture; record the pressure gauge one and pressure gauge two to obtain the pressure difference value Δ1 before and after the sulfur dissolution reaction unit;

[0027] Turn on the liquid pumping unit to add the liquid in liquid tank 2 into the first pipeline; the liquid and gas form a gas-liquid mixture; after the gas-liquid mixture has flowed through the entire process for a period of time (i.e. after the sulfur dissolution process), record pressure gauge 1 and pressure gauge 2 to obtain the pressure difference Δ2 before and after the sulfur dissolution reaction unit.

[0028] The pressure difference change after the reaction is X = (Δ1 - Δ2) / Δ1;

[0029] After the liquid pumping unit is turned off, the gas supply unit blows the liquid in the circulation process to the circulation unit. Then the gas supply unit is turned off and the circulation unit is turned on to collect water samples. The concentration of the water sample is measured, and the measured value is multiplied by the liquid volume to obtain the amount of dissolved solids Y.

[0030] Finally, the online sulfur dissolution evaluation effect is determined based on the values ​​of X and Y. The closer the value of X is to 1 and the larger the value of Y, the better the sulfur dissolution effect.

[0031] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0032] (1) The simulation of elemental sulfur deposition characteristics, gas-liquid environment, tubular environment and high pressure environment of the online sulfur dissolution evaluation device and sulfur dissolution evaluation method of the present invention is more consistent with the actual situation on site.

[0033] (2) The compatibility of the sulfur-dissolving liquid with various liquids on site has been fully considered, and the impact of secondary scaling or blockage on the results has been fully considered.

[0034] (3) The total sulfur ion content can directly characterize the amount of sulfur dissolved, and the results are more realistic and reliable; the pressure difference change is more intuitive and consistent with the evaluation of the on-site online sulfur dissolution process; the evaluation method does not involve the filtration device, reducing the error; the evaluation device and method do not introduce any agents other than sulfur dissolving agents and other scale dissolving agents, reducing the error. Attached Figure Description

[0035] To more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of the present invention and should not be considered as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort. In the drawings:

[0036] Figure 1 This is a schematic diagram of the online sulfur dissolution evaluation device of the present invention.

[0037] The attached diagram shows the markings and corresponding component names: 1-Sulfur dissolution reaction unit, 101-Reaction cylinder, 102-Heating element, 103-Spiral flow channel element, 104-Thermostat, 2-Gas supply unit, 201-Gas source element, 202-Gas control valve, 203-Gas booster, 3-Feeding unit, 301-Valve one, 4-Liquid pumping unit, 401-Liquid pump, 402-Liquid tank one, 403-Liquid tank two, 404-Valve two, 5-Circulation unit, 501-Gas-liquid two-phase separator, 502-Liquid pipe, 503-Recovery pipe, 504-Gas pipe, 505-Stable flow storage tank, 506-Valve four, 6-Pressure gauge one, 7-Pressure gauge two, 8-First pipe, 801-Valve three. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments and accompanying drawings. The illustrative embodiments and descriptions of this invention are for explanation only and are not intended to limit the invention. The following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without inventive effort are within the scope of protection of this invention.

[0039] It should be noted that similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0040] Example 1

[0041] Combination Figure 1 As shown, this is an online sulfur dissolution evaluation device according to Embodiment 1 of the present invention, and its specific structure is described below.

[0042] The online sulfur dissolution evaluation device of this embodiment 1 mainly includes five parts: sulfur dissolution reaction unit 1, gas supply unit 2, feeding unit 3, liquid pumping unit 4, and circulation unit 5.

[0043] Furthermore, in combination Figure 1 As shown, the sulfur dissolving reaction unit 1 is a horizontal cylindrical reaction cylinder 101. A fixed base is installed at the bottom of the reaction cylinder 101. The fixed base is equipped with four metal rings that fit around the reaction cylinder 101. The metal rings are welded and then reinforced by clamping. The fixed base is fixedly installed on the ground.

[0044] A heating element 102 is installed in the reaction cylinder 101 to heat the internal environment of the reaction cylinder 101. The spiral flow channel component 103 is a spiral-shaped pipe; in this embodiment, three spiral flow channel components 103 are provided, and they are installed inside the heated reaction cylinder 101. The reaction cylinder 101 includes an inner annular cylinder and an outer annular cylinder. The outer annular cylinder has a polyurethane foam insulation layer on its outer surface; the outer annular cylinder is made of one or more of aluminum, iron, aluminum alloy, and steel.

[0045] The spiral flow channel component 103 provides a space for solid powder to adhere. Simultaneously, by increasing the path length and decreasing the airflow channel aperture through the spiral, this design increases airflow resistance, thereby increasing the pressure difference between the front and rear ends and improving evaluation results. The spiral flow channel component 103 is made of one or more of the following materials: pressure-resistant glass, aluminum, iron, aluminum alloy, and steel; the remaining space within the spiral cavity is filled with cast temperature- and pressure-resistant glass or other liquid metal.

[0046] The internal chamber of the reaction cylinder 101 provides a place for sulfur powder to adhere and for the sulfur dissolution reaction to occur, while also amplifying the pressure difference before and after the sulfur dissolution reaction unit 1.

[0047] It should be noted that the heating element 102 is configured as the existing heating element 102, with the annular heating element 102 arranged around the spiral flow channel 103 to facilitate omnidirectional heating of the spiral flow channel 103. The heating element 102 is electrically connected to the temperature controller 104, which is used to control the heating power and working time of the heating element 102, which is beneficial for heating the interior of the reaction cylinder 101 to a predetermined temperature. The temperature can be adjusted between 0℃ and 550℃ according to the actual site conditions. The heating element 102 is installed in the cavity between the inner and outer annular cylinders of the reaction cylinder 101.

[0048] Furthermore, a first pipe 8 is installed on the left side of the reaction cylinder 101, and a recovery pipe 503 is installed on the right side of the reaction cylinder 101. The outlet end of the first pipe 8 extends into the reaction cylinder 101, and a four-way connector is installed at the outlet end to divert the flow. The other three outlets of the four-way connector are connected to the inlets of the three spiral flow channel components 103. The inlet end of the recovery pipe 503 extends into the reaction cylinder 101, and a four-way connector is installed at the inlet end to converge the flow. The other three inlets of the four-way connector are connected to the outlets of the three spiral flow channel components 103.

[0049] Combination Figure 1 As shown, pressure gauge 6 is installed on the first pipeline 8, and pressure gauge 7 is installed on the recovery pipeline 503. Pressure gauges 6 and 7 collect the pressure values ​​at the inlet and outlet of the sulfur dissolution reaction unit 1, respectively, to facilitate sulfur dissolution evaluation. Valve 506 is also installed on the recovery pipeline 503, located downstream of pressure gauge 7.

[0050] In some implementations of this embodiment, combined with Figure 1 As shown, the gas supply unit 2 includes a gas source component 201, which is connected to a gas control valve 202 via a pipeline. The gas control valve 202 is connected to a gas booster 203 via a pipeline, and the gas booster 203 is then connected to three spiral flow channel components 103 via a first pipeline 8. The gas control valve 202 is used to control the gas flow rate, resulting in better performance.

[0051] It should be noted that the gas supply unit 2 is used to provide gas at a preset flow rate to the sulfur dissolution reaction unit 1 to simulate the pressure environment in the gas well gathering and transportation system. The gas stored in the gas source unit 201 includes, but is not limited to, purified natural gas, nitrogen, compressed air, etc., all of which are commonly used production gases and gas lift gases on site; and the preset flow rate is determined according to the daily gas production on site.

[0052] Furthermore, such as Figure 1As shown, the feeding unit 3 has a storage chamber inside, which is filled with sulfur powder or granules. The type of sulfur powder or granules can be elemental sulfur, deposited sulfur, and other mixed sulfur scale. It should be noted that the amount of sulfur powder or granules can be 1 / 4, 2 / 4, and 3 / 4 of the volume of the spiral flow channel 103, respectively, corresponding to the severity of sulfur deposition on site, namely light, moderate, and heavy.

[0053] The inlet pipe of the feeding unit 3 is connected to the first pipe 8, and a valve 301 is installed on the inlet pipe. The outlet pipe of the feeding unit 3 is connected to the first pipe 8, and a valve 801 is installed on the first pipe 8. The valve 801 is located between the inlet pipe connection and the outlet pipe connection of the feeding unit 3. The airflow of the gas supply unit 2 is controlled by the valves 301 and 801 to determine whether it passes through the feeding unit 3.

[0054] In some implementations of this embodiment, combined with Figure 1 As shown, the liquid pumping unit 4 includes three parts: a liquid pump 401, a first liquid tank 402, and a second liquid tank 403. The liquid pump 401 is connected to the first liquid tank 402 and the second liquid tank 403 via two pipes respectively. Under the action of pumping, the first liquid tank 402 and the second liquid tank 403 supply liquid to the liquid pump 401. The outlet of the liquid pump 401 is connected to a pipe, on which a second valve 404 is installed. This pipe is connected to the first pipe 8, and the connection point is located downstream of the third valve 801.

[0055] It should be noted that the liquid pumping unit 4 is used to pump sulfur dissolving agent and other field liquids into the sulfur dissolving reaction unit 1 to simulate the liquid environment in the gas well gathering and transportation system. The liquid types in liquid tank 1 402 and liquid tank 2 403 are liquids present in the field gas production process, such as one or more of the following: clean water, formation water, drilling fluid, completion acidizing fluid, corrosion inhibitor, ethylene glycol, and preparation fluid.

[0056] In some implementations of this embodiment, such as Figure 1 As shown, the circulation unit 5 includes a gas-liquid two-phase separator 501 and a flow-stabilizing storage tank 505. The inlet of the gas-liquid two-phase separator 501 is connected to the recovery pipe 503, and the two outlets of the gas-liquid two-phase separator 501 are connected to the gas pipe 504 and the liquid pipe 502, respectively. The gas pipe 504 transports the separated gas, and the liquid pipe 502 transports the separated liquid. Furthermore, the flow-stabilizing storage tank 505 is connected to the liquid pipe 502, and the separated liquid can be temporarily stored in the flow-stabilizing storage tank 505 to stabilize the flow. The separated gas returns to the gas source unit 201 through the gas pipe 504 for storage, and can re-enter the first pipe 8 under the action of the gas booster 203 to re-enter the next cycle.

[0057] The function of the circulation unit 5 is to separate the gas-water mixture after the reaction and to add the separated gas and liquid back into the circulation process as gas and liquid sources.

[0058] Example 2

[0059] This embodiment provides a recyclable sulfur dissolution evaluation method, which uses the online sulfur dissolution evaluation device in Embodiment 1.

[0060] like Figure 1 As shown, an evaluation implementation method for the online sulfur dissolution evaluation device of Embodiment 1 of this application, which allows for cyclic sulfur dissolution, is as follows:

[0061] Before the experiment, based on the results of on-site sulfur deposition sampling and analysis, it was determined that the type of sulfur powder required for the experiment was precipitated sulfur with a single elemental sulfur content of 99%. 100g of precipitated sulfur was prepared and placed in feeding unit 3. The liquid pump 401 was turned off. At the same time, based on the on-site water production, corrosion inhibitor and sulfur dissolving agent dosage, 100L of mixed liquid with the ratio of on-site gas field water: corrosion inhibitor: sulfur dissolving agent = 90:1:9 was prepared and added to liquid tank 403. A nitrogen gas tank was prepared as the gas source 201.

[0062] After preparing the materials, first close valve 3 (801) and valve 4 (506), and open valve 1 (301) to establish a simulated sulfur deposition process. Gas first passes through the storage chamber of feeding unit 3. Then, turn off the gas booster 203 and adjust the gas control valve 202 to the minimum to ensure that the gas flow slowly enters the storage chamber, blowing the precipitated sulfur powder into the sulfur dissolution reaction unit 1. Due to the closure of valve 4 (506), the precipitated sulfur powder can only be deposited in the sulfur dissolution reaction unit 1.

[0063] After all the settled sulfur powder in the feeding unit 3 is purged into the process, valve 301 is closed; the temperature controller 104 is adjusted, and the heating element 102 generates heat to heat the temperature inside the reaction cylinder 101 to 500°C. The purpose of this process is to heat and sublimate the settled sulfur powder to adhere to the inner wall of the spiral flow channel 103, which is used to simulate the location and amount of sulfur deposition in the on-site collection and transportation system; after heating for 1 hour, the temperature controller 104 is adjusted to reduce the temperature inside the reaction cylinder 101 to 50°C to simulate the temperature inside the ground collection and transportation system during the online sulfur dissolution process;

[0064] Close valve 301, open valves 801 and 506, and open the gas-liquid two-phase separator 501 in the circulation unit 5 to establish an online sulfur dissolution reaction process; open the gas control valve 202 and adjust it to the maximum, turn on the gas booster 203, adjust the appropriate power to ensure the gas pressure is 2MPa, and deliver stable gas to the circulation process; turn on the liquid pump 401 and add the liquid in the liquid tank 402 to the first pipeline 8; the liquid forms a gas-liquid mixture with the gas. At this time, observe and record the gas pressure of pressure gauge 6 and pressure gauge 7, which is the pressure difference Δ1 before the online sulfur dissolution reaction;

[0065] Turn on the liquid pump 401 and adjust the discharge rate to 4L / min. Stable pump the mixture of gas field water, corrosion inhibitor and sulfur dissolving agent in the liquid tank 403 into the first pipeline 8 to simulate the overall liquid environment in the online sulfur dissolution process, test the compatibility of the sulfur dissolving agent with other liquids in the gathering and transportation system, and start the online sulfur dissolution process. After the preset online sulfur dissolution time of 6h, turn off the liquid pump 401 and stop adding liquid to the process. At this time, observe and record the air pressure of pressure gauge 6 and pressure gauge 7, which is the pressure difference Δ2 after the online sulfur dissolution reaction.

[0066] After the reaction ends, the liquid pumping unit 4 is turned off, and the gas booster 203 is kept running to blow the remaining liquid in the process into the steady flow storage tank 505. Then, the gas booster 203, the gas source unit 201, and the gas control valve 202 are turned off in sequence. Then, the temperature controller 104 is turned off to reduce the temperature of the entire process to room temperature.

[0067] Open the steady flow storage tank 505 to collect a water sample; measure the concentration of the water sample, and multiply the measured value by the liquid volume to obtain the amount of dissolved solids Y; the larger the value of Y, the better the sulfur dissolution effect.

[0068] The online sulfur dissolution effect is determined by the change in pressure difference after the reaction, i.e., X = (Δ1 - Δ2) / Δ1. When the value of X is between 0.75 and 1, the sulfur dissolution effect is good; when the value of X is between 0.5 and 0.75, the sulfur dissolution effect is relatively good; when the value of X is between 0.25 and 0.5, the sulfur dissolution effect is average; and when the value of X is between 0 and 0.25, the sulfur dissolution effect is poor.

[0069] Example 3

[0070] This embodiment utilizes an online sulfur dissolution evaluation device to implement a non-circulating sulfur dissolution evaluation method, as follows:

[0071] Before the experiment, based on the results of on-site sulfur deposition sampling and analysis, the type of sulfur powder required for the experiment was determined to be 50g of on-site settled sulfur, which was placed in the feeding unit 3; the liquid pump 401 was turned off, 1L of sulfur dissolving agent was prepared and added to the liquid tank 402; and a nitrogen gas tank was prepared as the gas source 201.

[0072] After connecting all equipment and pipelines of the online sulfur dissolution evaluation device, always keep valve 4506 closed;

[0073] Close valve 3801 and open valve 1301 to establish a simulated sulfur deposition process; the gas from gas source 201 first passes through feeding unit 3; turn off gas booster 203 and adjust gas control valve 202 to the minimum to ensure that the gas flow slowly enters feeding unit 3 and blows the settled sulfur powder into spiral flow channel 103.

[0074] After all the settled sulfur powder in the storage chamber of feeding unit 3 is blown into the process, valve 301 is closed; temperature controller 104 is adjusted and heating element 102 is heated to raise the temperature inside reaction cylinder 101 to 50°C, simulating the temperature inside the ground collection and transportation system during the online sulfur dissolution process.

[0075] Close valve 301, open valve 801, open gas control valve 202, turn on gas booster 203, adjust the appropriate power to deliver gas at a preset pressure of 10MPa to the single process, and ensure that the pressure in the sulfur dissolution reaction unit is 10MPa.

[0076] Turn on the liquid pump 401 and adjust it to a suitable discharge rate. After injecting 1L of sulfur dissolving agent into the process pump, turn off the liquid pump 401 and stop adding liquid to the process. This allows the sulfur dissolving agent to be added into the spiral flow channel 103 and react with the sulfur powder therein. After the preset sulfur dissolving reaction time of 2 hours.

[0077] After the reaction is complete, turn on the gas booster 203 and valve 506 to blow the remaining liquid in the process into the steady flow storage tank 505, and then turn off the gas booster 203, gas source 201 and gas control valve 202 in sequence; then turn off the temperature controller 104 to reduce the temperature of the entire process to room temperature.

[0078] Open the steady flow storage tank 505 to take a water sample, and then perform S... 2- Concentration is measured, and the measured value is multiplied by the liquid volume to obtain the amount of dissolved solid Y. The larger the value of Y, the better the sulfur dissolution effect.

[0079] In summary, in a first aspect, the present invention provides an online sulfur dissolution evaluation device, which includes a sulfur dissolution reaction unit 1, a gas supply unit 2, a feeding unit 3, a liquid pumping unit 4, and a circulation unit 5; the sulfur dissolution reaction unit 1 includes a reaction cylinder 101, the reaction cylinder 101 is provided with a heating element 102 to raise the internal temperature, and the interior of the reaction cylinder 101 is provided with a plurality of spiral flow channel components 103; the gas supply unit 2 is provided with a first pipe 8 connected to the plurality of spiral flow channel components 103; the inlet and outlet of the feeding unit 3 are both connected to the first pipe 8; the liquid pumping unit 4 is connected to the first pipe 8; the circulation unit 5 includes a gas-liquid two-phase separator 501, the inlet end of the gas-liquid two-phase separator 501 is provided with a recovery pipe 503 connected to the plurality of spiral flow channel components 103, the outlet end of the gas-liquid two-phase separator 501 is provided with a gas pipe 504 connected to the gas supply unit 2 and a liquid pipe 502 connected to the liquid pumping unit 4; the first pipe 8 is provided with a pressure gauge 6, and the recovery pipe 503 is provided with a pressure gauge 7. Gas supply unit 2 includes a gas source component 201 connected to gas pipe 504. Gas source component 201 is connected to gas control valve 202, and gas control valve 202 is connected to gas booster 203. Gas booster 203 is connected to the inlet of first pipeline 8. A valve 301 is installed at the inlet of feeding unit 3. Liquid pumping unit 4 includes a liquid pump 401 connected to liquid pipe 502. Liquid pump 401 is connected to liquid tank 402 and liquid tank 403. Liquid pump 401 is connected to first pipeline 8, and a valve 404 is installed at the outlet of liquid pump 401. A valve 801 is installed in first pipeline 8. Valve 801 is located downstream of the inlet connection of feeding unit 3 and upstream of the outlet connection of liquid pump 401. A four-way connector connected to spiral flow channel component 103 is installed in first pipeline 8, and a four-way connector connected to spiral flow channel component 103 is installed in recovery pipeline 503. The recovery pipe 503 is equipped with valve 4 506, which is located downstream of pressure gauge 2 7. The heating element 102 is configured as an annular heating element 102 surrounding the spiral flow channel 103, and is electrically connected to a temperature controller 104. The liquid pipe 502 is connected to a flow-stabilizing storage tank 505.

[0080] Secondly, the present invention also provides a method for evaluating sulfur dissolution, which employs an online sulfur dissolution evaluation device and further includes the following methods.

[0081] Gas supply unit 2 is connected to feeding unit 3, and the inlet of circulation unit 5 is closed; the gas supplied by gas supply unit 2 flows through feeding unit 3, and the solid powder in feeding unit 3 is blown into the spiral flow channel 103 of reaction cylinder 101 before gas supply unit 2 is closed.

[0082] Turn on the heating element 102 to adjust the temperature in the reaction cylinder 101 to a predetermined value and continue heating for a predetermined time;

[0083] Then close the inlet of the feeding unit 3 and open the inlet of the circulation unit 5; the gas-liquid two-phase separator 501 starts working; turn on the gas supply unit 2 and adjust the gas to the predetermined flow rate;

[0084] Turn on the liquid pumping unit 4 to add the liquid in the liquid tank 402 into the first pipe 8; the liquid and gas form a gas-liquid mixture; record the pressure gauge 6 and pressure gauge 7 to obtain the pressure difference Δ1 before and after the sulfur dissolution reaction unit 1;

[0085] Turn on the liquid pumping unit 4 to add the liquid in the liquid tank 403 into the first pipe 8; the liquid and gas form a gas-liquid mixture; record the pressure gauge 6 and pressure gauge 7 to obtain the pressure difference Δ2 before and after the sulfur dissolution reaction unit 1;

[0086] The pressure difference change after the reaction is X = (Δ1 - Δ2) / Δ1;

[0087] After the liquid pumping unit 4 is turned off, the gas supply unit 2 blows the liquid in the circulation process to the circulation unit 5. Then the gas supply unit 2 is turned off and the circulation unit 5 is turned on to collect the water sample. The concentration of the water sample is measured, and the measured value is multiplied by the liquid volume to obtain the amount of dissolved solid Y.

[0088] Finally, the online sulfur dissolution evaluation effect is determined based on the values ​​of X and Y. The closer the value of X is to 1 and the larger the value of Y, the better the sulfur dissolution effect.

[0089] The online sulfur dissolution evaluation device and method of this invention simulate the elemental sulfur deposition characteristics, gas-liquid environment, tubular environment, and high-pressure environment more realistically than actual field conditions; it fully considers the compatibility of the sulfur dissolving liquid with various liquids on site, and fully considers the impact of secondary scaling or blockage on the results; the total sulfur ion content can directly characterize the amount of sulfur dissolved, making the results more realistic and reliable; the pressure difference change is more intuitive and consistent with the evaluation of the online sulfur dissolution process on site; the evaluation method does not involve a filtration device, reducing errors; the evaluation device and method do not introduce any reagents other than sulfur dissolving agents and other scale dissolving agents, reducing errors.

[0090] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An online sulfur dissolution evaluation device, characterized in that, It includes a sulfur dissolution reaction unit (1), a gas supply unit (2), a feeding unit (3), a liquid pumping unit (4), and a circulation unit (5); The sulfur dissolving reaction unit (1) includes a reaction cylinder (101), which is equipped with a heating element (102) to raise the internal temperature, and the interior of the reaction cylinder (101) is provided with multiple spiral flow channels (103). The gas supply unit (2) is provided with a first pipe (8) connected to multiple spiral flow channel components (103). The inlet and outlet of the feeding unit (3) are both connected to the first pipe (8). The liquid injection unit (4) is connected to the first pipe (8). The circulation unit (5) includes a gas-liquid two-phase separator (501). The inlet end of the gas-liquid two-phase separator (501) is provided with a recovery pipe (503) connected to multiple spiral flow channel components (103). The outlet end of the gas-liquid two-phase separator (501) is provided with a gas pipe (504) connected to the gas supply unit (2) and a liquid pipe (502) connected to the liquid injection unit (4). The first pipeline (8) is equipped with a pressure gauge 1 (6), and the recovery pipeline (503) is equipped with a pressure gauge 2 (7).

2. The online sulfur dissolution evaluation device according to claim 1, characterized in that, The gas supply unit (2) includes a gas source component (201) connected to the gas pipe (504), the gas source component (201) is connected to a gas control valve (202), the gas control valve (202) is connected to a gas booster (203), and the gas booster (203) is connected to the inlet of the first pipe (8).

3. The online sulfur dissolution evaluation device according to claim 2, characterized in that, The inlet of the feeding unit (3) is equipped with valve 1 (301).

4. The online sulfur dissolution evaluation device according to claim 1, characterized in that, The liquid pumping unit (4) includes a liquid pump (401) connected to the liquid pipe (502), the liquid pump (401) is connected to a liquid tank one (402) and a liquid tank two (403), the liquid pump (401) is connected to the first pipe (8), and a valve two (404) is provided at the outlet of the liquid pump (401).

5. The online sulfur dissolution evaluation device according to claim 4, characterized in that, The first pipeline (8) is equipped with valve three (801), which is located downstream of the inlet connection of the feeding unit (3) and upstream of the outlet connection of the liquid pump (401).

6. The online sulfur dissolution evaluation device according to claim 1, characterized in that, The first pipe (8) is provided with a four-way valve connected to the spiral flow channel component (103), and the recovery pipe (503) is provided with a four-way valve connected to the spiral flow channel component (103).

7. The online sulfur dissolution evaluation device according to claim 1, characterized in that, The recovery pipeline (503) is equipped with valve four (506), which is located downstream of pressure gauge two (7).

8. The online sulfur dissolution evaluation device according to claim 1, characterized in that, The heating element (102) is configured as an annular heating element 102 surrounding the spiral flow channel element (103), and the annular heating element 102 is electrically connected to a temperature controller (104).

9. The online sulfur dissolution evaluation device according to claim 1, characterized in that, The liquid pipe (502) is connected to a steady-flow storage tank (505).

10. A method for evaluating sulfur dissolution, characterized in that, The online sulfur dissolution evaluation device as described in claim 1 further includes the following method: The gas supply unit (2) is connected to the feeding unit (3), and the inlet of the circulation unit (5) is closed; the gas supplied by the gas supply unit (2) flows through the feeding unit (3), and the solid powder in the feeding unit (3) is blown into the spiral flow channel (103) of the reaction cylinder (101) before the gas supply unit (2) is closed. Turn on the heating element (102) to adjust the temperature in the reaction vessel (101) to a predetermined value and continue heating for a predetermined time; Then the inlet of the feeding unit (3) is closed and the inlet of the circulation unit (5) is opened; the gas-liquid two-phase separator (501) starts to work; Turn on the gas supply unit (2) and adjust the gas to the predetermined flow rate; Open the liquid pump unit (4) to add the liquid in the liquid tank (402) into the first pipe (8); the liquid forms a gas-liquid mixture with the gas; record the pressure gauge (6) and pressure gauge (7) to obtain the pressure difference Δ1 before and after the sulfur dissolution reaction unit (1); Open the liquid pump unit (4) to add the liquid in the liquid tank (403) into the first pipe (8); the liquid forms a gas-liquid mixture with the gas; after the sulfur dissolution process, record the pressure gauge (6) and pressure gauge (7) to obtain the pressure difference Δ2 before and after the sulfur dissolution reaction unit (1); The pressure difference change after the reaction is X = (Δ1 - Δ2) / Δ1; After the liquid pumping unit (4) is turned off, the gas supply unit (2) blows the liquid in the circulation process to the circulation unit (5), then turns off the gas supply unit (2), and turns on the circulation unit (5) to collect water samples; the concentration of the water sample is measured, and the measured value is multiplied by the liquid volume to obtain the amount of dissolved solid Y; Finally, the online sulfur dissolution evaluation effect is determined based on the values ​​of X and Y. The closer the value of X is to 1 and the larger the value of Y, the better the sulfur dissolution effect.

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