Natural gas well hydrogen sulfide on-site rapid tester

Abstract

The invention discloses a natural gas well hydrogen sulfide on-site rapid tester, which belongs to the technical field of industrial quantitative collection, and is technically characterized by comprising a USB (Universal Serial Bus) port, a computer switch, a power switch, an observation window, a sampling bottle mounting bayonet, a fan, a power line socket, a natural gas inlet and a buffer solution inlet, the method further comprises the following steps: step 1, starting up and preheating a tester, checking the functions of the tester, pre-filling gas through a natural gas inlet, pre-filling liquid through a buffer liquid inlet, and mounting a sampling bottle at a sampling bottle mounting bayonet; 2, debugging a software interface, and setting system parameters of the interface; 3, managing user login and access authority of the software; and 4, removing residual liquid of the liquid pump, purging the flow meter to remove residual gas, quitting software, turning off a computer switch and turning off a power switch. The method has the advantages of debugging, manual control, testing, parameter setting of automatic acquisition, automatic acquisition, file storage and stopping at any time when an acquisition process has problems.

Description

Technical Field

[0001] This invention relates to the field of industrial quantitative data acquisition technology, specifically to a rapid on-site tester for hydrogen sulfide in natural gas wells. Background Technology

[0002] Hydrogen sulfide gas is a colorless, highly toxic acidic gas. Low concentrations can irritate the eyes and respiratory tract, damage the sense of smell, and paralyze nerves, while high concentrations can cause immediate death. Hydrogen sulfide gas is present to varying degrees in my country's developed oil and gas fields. During the exploration and development of oil and gas wells, especially when drilling high-pressure deep wells, it is highly likely that hydrogen sulfide-containing formations will be encountered. To ensure personnel safety during development, it is necessary to regularly measure the hydrogen sulfide content of each individual well.

[0003] Currently, the commonly used method for hydrogen sulfide determination in oil and gas fields is iodometric titration. Iodometric titration is simple to use and has a measurement range from 0% to 100%. While this method can be performed on-site without bringing the gas into the laboratory, avoiding the inaccurate results caused by adsorption, it has several drawbacks. For example, on-site hydrogen sulfide absorption is insufficient; wet flow meter measurement is significantly affected by temperature; titration is greatly affected by human operation; it requires carrying a large amount of glassware and reagents on-site; and the titration process needs to be protected from light, which is difficult to meet in the on-site environment. These drawbacks all lead to inaccurate measurement results. Furthermore, currently available integrated on-site hydrogen sulfide measuring instruments are based on the lead acetate paper tape method, a simplified method with low accuracy. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a rapid on-site tester for hydrogen sulfide in natural gas wells to solve the problems mentioned in the background.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A rapid on-site tester for hydrogen sulfide in natural gas wells includes a USB port, a computer switch, a power switch, an observation window, a sampling bottle mounting bracket, a fan, a power cord socket, a natural gas inlet, and a buffer solution inlet, and further includes the following steps: Step 1: Power on and warm up the tester, check its functions, pre-add gas through the natural gas inlet, pre-add liquid through the buffer solution inlet, and install the sampling bottle at the sampling bottle mounting bracket. Step 2: Debug the software interface and set the system parameters of the interface; Step 3: Manage user login and access permissions for the management software; Step 4: Remove residual liquid from the liquid pump, purge the flow meter to remove residual gas, exit the software, turn off the computer switch, and turn off the power switch.

[0006] As a further aspect of the present invention, the debugging of the software interface includes purging, pre-injection, pumping out residual liquid, and a stop button, wherein the stop button is electrically connected to purging, pre-injection, and pumping out residual liquid.

[0007] As a further aspect of the present invention, the debugging of the software interface also includes: When debugging the pulse meter, if the current count value of the pulse meter can be read normally and the count value can be cleared to zero, it is determined that the pulse meter is working and can communicate with the computer master station. Flow meter commissioning, which includes valve control, serial port parameters, flow parameters, and flow settings; I / O module debugging: The I / O module debugging tool includes a probe, vacuum valve, and vacuum pump control button. Liquid flow pump commissioning, which is used to control the speed and direction of the flow pump.

[0008] As a further embodiment of the present invention, the valve control valve includes a normal position, a closed position, and a purge position, and the states displayed in the valve status bar are NORMAL, FLOW-OFF, and PURGE, respectively.

[0009] As a further aspect of the present invention, the serial port parameters read the communication station number and baud rate of the flow meter.

[0010] As a further aspect of the present invention, the flow parameter reading valve reads the current flow rate and temperature.

[0011] As a further aspect of the present invention, the flow meter is set to a flow rate (sccm / s), and the flow meter operates within a range of 0-730 sccm / s, which is used to query the set flow rate value and to query the full-scale flow rate.

[0012] As a further aspect of the present invention, the system parameters of the setting interface include setting and saving four sets of acquisition parameters. Each set of acquisition parameters includes vacuuming time, gas flow meter set flow rate, gas volume, liquid volume, and liquid pump speed. After setting the parameters, they are saved in the corresponding combination. When applying, the parameters are selected from the pre-stored parameter combinations and clicked to confirm use.

[0013] As a further aspect of the present invention, the user login and access permissions of the management software include modifying the administrator password and adding or deleting operators.

[0014] In summary, the embodiments of the present invention have the following beneficial effects compared with the prior art: In terms of gas absorption, the metering method has been optimized by using a mass flow meter instead of a wet gas flow meter based on the iodometric method, resulting in more accurate metering and avoiding the influence of temperature. Simultaneously, fully automated injection of the absorbent liquid and fully automated gas absorption have been achieved, forming an integrated gas absorption device. Compared with traditional methods, it eliminates the need for calibration using water saturated vapor pressure or atmospheric pressure.

[0015] In terms of analytical testing, the titration method has been optimized, using potentiometric titration instead of manual titration.

[0016] The absorption section and the testing section are used together to test the hydrogen sulfide content.

[0017] To more clearly illustrate the structural features and effects of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0018] Figure 1 This is a simplified diagram of a sampling system according to an embodiment of the invention.

[0019] Figure 2 This is a diagram of the main interface in an embodiment of the invention.

[0020] Figure 3 This is a diagram of the menu bar in an embodiment of the invention.

[0021] Figure 4 This is a diagram of the debugging interface in an embodiment of the invention.

[0022] Figure 5 This is a diagram of the pulse table interface in an embodiment of the invention.

[0023] Figure 6 This is a diagram of the flow meter debugging interface in an embodiment of the invention.

[0024] Figure 7 This is a debugging diagram of the I / O module in an embodiment of the invention.

[0025] Figure 8 This is a flow pump adjustment diagram in an embodiment of the invention.

[0026] Figure 9 This is a diagram of the parameter setting interface in an embodiment of the invention.

[0027] Figure 10 This is a graph showing the relationship between the evacuation time and vacuum level of a 250mL sampling bottle in an embodiment of the invention.

[0028] Figure 11 This is a graph showing the relationship between the evacuation time and vacuum level of a 500mL sampling bottle in an embodiment of the invention.

[0029] Figure 12 This is a diagram of the login interface in an embodiment of the invention.

[0030] Figure 13 This is a permission management diagram in an embodiment of the invention.

[0031] Figure 14 This is a project column diagram in an embodiment of the invention.

[0032] Figure 15 This is a diagram of the interface for creating a new project in an embodiment of the invention.

[0033] Figure 16 This is a report output diagram from an embodiment of the invention. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0035] The specific implementation of the present invention will be described in detail below with reference to specific embodiments.

[0036] In one embodiment, a rapid on-site tester for hydrogen sulfide in natural gas wells is described in [reference needed]. Figures 1 to 16 It includes a USB port, a computer switch, a power switch, an observation window, a sampling bottle mounting bracket, a fan, a power cord socket, a natural gas inlet, and a buffer solution inlet, characterized in that it further includes the following steps: Step 1: Power on and warm up the tester, check its functions, pre-add gas through the natural gas inlet, pre-add liquid through the buffer solution inlet, and install the sampling bottle at the sampling bottle mounting bracket. Step 2: Debug the software interface and set the system parameters of the interface; Step 3: Manage user login and access permissions for the management software; Step 4: Remove residual liquid from the liquid pump, purge the flow meter to remove residual gas, exit the software, turn off the computer switch, and turn off the power switch.

[0037] Further, see Figures 1 to 16 The debugging of the software interface includes purging, pre-injection, pumping out residual liquid, and a stop button. The stop button is electrically connected to purging, pre-injection, and pumping out residual liquid.

[0038] Further, see Figures 1 to 16 The debugging of the software interface also includes: When debugging the pulse meter, if the current count value of the pulse meter can be read normally and the count value can be cleared to zero, it is determined that the pulse meter is working and can communicate with the computer master station. Flow meter commissioning, which includes valve control, serial port parameters, flow parameters, and flow settings; I / O module debugging: The I / O module debugging tool includes a probe, vacuum valve, and vacuum pump control button. Liquid flow pump commissioning, which is used to control the speed and direction of the flow pump.

[0039] Further, see Figures 1 to 16 The valve control valve includes a normal position, a closed position, and a purge position. The valve status is displayed in the valve status bar as NORMAL, FLOW-OFF, and PURGE, respectively.

[0040] Further, see Figures 1 to 16 The serial port parameters read the communication station number and baud rate of the flow meter.

[0041] Further, see Figures 1 to 16 The flow parameter reads the current flow rate and temperature of the valve.

[0042] Further, see Figures 1 to 16 The flow meter is set to a flow rate (sccm / s), and its operating range is 0-730 sccm / s. It is used to query the set flow rate value and the full-scale flow rate.

[0043] Further, see Figures 1 to 16 The system parameters in the settings interface include setting and saving four sets of acquisition parameters. Each set of acquisition parameters includes vacuuming time, gas flow meter set flow rate, gas volume, liquid volume, and liquid pump speed. After setting the parameters, save them under the corresponding combination. When applying, select the pre-stored parameter combination and click to confirm use.

[0044] Further, see Figures 1 to 16 The user login and access permissions of the management software include modifying the administrator password and adding or deleting operators.

[0045] In this embodiment, the natural gas sampling instrument uses a touch screen industrial tablet computer as the control core. Dedicated software controls the feedback signals of actuators such as gas flow meters, liquid pumps, solenoid valves, and electric actuators, as well as sensors such as pressure transmitters and pulse meters, to realize a dedicated intelligent instrument for vacuuming and quantitative injection of gas and liquid.

[0046] The sampler features a 10.1-inch touchscreen on the front, where all operations are performed. Operation can be controlled via touch, stylus, or mouse. Two switches are located on the right side of the screen: the larger one is the power switch for the control circuit, and the one on the left is the computer switch. Both switches can be operated independently after the power cord is plugged in at the rear of the unit. A USB port is located on the left side of the screen, allowing connection to a mouse or USB flash drive to copy collected files or reports. A viewing window in the lower right corner allows direct observation of the needle insertion and withdrawal during sampling. If necessary, the acrylic plate can be removed for needle replacement using tweezers. The right side panel has a slot for inserting sampling bottles; before sampling, insert the bottle cap into the slot and lock the handle. A power cord socket is located on the rear panel. The natural gas and buffer tubing have quick-screw connections and require external 6×4 PU tubing. A cooling and exhaust fan is located at the top, automatically activating when the internal temperature exceeds 35 degrees Celsius.

[0047] The main interface of the software is as follows Figure 2 It consists of a menu bar at the top, a list of items on the left, a graphical display bar in the middle, and a data display bar on the right, such as... Figure 3 Menu bar: Includes various operation options, current instrument status, and process status during automatic data acquisition.

[0048] like Figure 4 As shown, the interface has 8 options followed by 4 buttons. The first three buttons are for purging, pre-injection, and pumping out residual gas, and the last button is a stop button shared by the first three. Each function operates for one minute by default and can be stopped at any time by pressing the stop button. Purging is used to remove residual sampling gas from the flow meter and pipeline after sampling. The instrument must be disconnected from the natural gas source before purging. The purging button is also used for pre-injection before the experiment. After connecting the natural gas source before sampling, press the purging button to pre-inject gas into the flow meter and pipeline at the front end of the solenoid valve. Note that pre-injection only needs to run for 15-20 seconds. Pre-injection fills the pipeline and liquid pump chamber with liquid before the first automatic sampling. When pre-injecting, the sampling bottle must be installed, and after observing the liquid being steadily pumped out by needle 2, press the stop button. Pumping out residual gas removes residual gas from the pipeline and pump after sampling. The flow rate will be displayed in real time on the corresponding graphs when these three functions are executed.

[0049] The four options at the top of this interface will pop up sub-interfaces, such as pulse table debugging. Figure 5 As shown, the communication and function of the pulse meter are tested. If the current count value of the pulse meter can be read normally and the count value can be cleared to zero, it indicates that the pulse meter is working normally and can communicate with the computer master station.

[0050] Flow meter commissioning Figure 6As shown, the flowmeter debugging interface is divided into four sub-interfaces: Valve Control, Serial Port Parameters, Flow Parameters, and Flow Settings. Valve Control allows you to control the valve position to Normal, Closed, and Purge. Pressing the "Read" button will display the valve's status in the status bar as: NORMAL, FLOW-OFF, PURGE. Serial Port Parameters allows you to read the flowmeter's communication station number and baud rate. Flow Parameters allows you to read the valve's current flow rate and temperature. Flow Settings allows you to set the flowmeter's set flow rate (sccm / s), ranging from 0-730, and query the set flow rate value. You can also query the full-scale flow rate.

[0051] I / O module debugging, such as Figure 7 As shown, the I / O module debugging interface has control buttons for the needle, vacuum valve, and vacuum pump. Clicking the needle control button advances the needle until it reaches the tip, then stops. Clicking it again resets the needle. Clicking the vacuum valve and vacuum pump button turns them on, and clicking them again turns them off.

[0052] The module also displays the current pressure sensor value and detects whether a sampling bottle is installed. When a sampling bottle is installed, a bottle indicator light will illuminate.

[0053] Liquid flow pump commissioning Figure 8 As shown, this module allows manual control of the flow pump's speed and direction.

[0054] System parameter settings interface as follows Figure 9 As shown, clicking "Settings" in the menu bar will bring up the following pop-up window. Figure 8 The interface allows you to set and save four sets of acquisition parameters. Each set consists of five adjustable parameters: vacuuming time, gas flow meter set flow rate, gas volume to be collected, liquid volume added, and liquid pump speed. After setting the parameters, you can click "Save" to save them to the corresponding combination. When applying the parameters, you can select from the pre-saved parameter combinations and click "Use" to confirm.

[0055] Parameter setting instructions: The vacuuming time is related to the vacuum level inside the collection bottle, and it is also related to the volume of the collection bottle and the collection needle. Figure 10-11 Vacuum curves for commonly used sampling bottles and needles are provided for reference. Larger sampling bottles and larger gas / liquid collection volumes require longer vacuum times. For vacuuming and gas injection, a No. 9 needle is recommended; for liquid injection, No. 7 or No. 8 needles can be used. (Needle length 30mm) It should be noted that please select the appropriate vacuum level from the provided text. Figure 10-11Select the vacuuming time because the vacuum levels in these two graphs are the measured vacuum levels inside the bottle. However, during actual sampling, the vacuum transmitter is installed in the vacuuming pipeline before the solenoid valve, and its measured vacuum level will be higher than the vacuum value inside the bottle. The gas flow meter flow rate setting range is (0-730 sccm / s). The larger the setting value, the shorter the sampling time. The gas volume and liquid volume to be sampled are set according to the sampling needs. The liquid pump speed can be selected from 100-600 rpm. The red line is for the No. 7 needle, and the blue line is for the No. 9 needle.

[0056] User login and permission management, such as Figure 12-13 As shown, after opening the software, the "Start" and "User Management" buttons in the menu bar are grayed out and disabled, and the current permissions bar above the project bar displays "No Permission". Users without proper permissions cannot perform these two operations. Clicking the "User Login" button will bring up a pop-up window as follows... Figure 15 On the system login screen, administrators can directly enter their password to log in (initial password: 123). Operators, on the other hand, must select their name in the right-hand column and enter their password to log in.

[0057] After logging in, the administrator also has management operator privileges. Clicking on User Management will bring up a pop-up window. Figure 16 The interface allows users to change the administrator password, add or delete operators.

[0058] Project panel features: The left side of the main interface is as follows Figure 13 The image shows the project panel. The top row of the project panel displays the current permissions and username, as described in the previous section.

[0059] Data replay: The experiment list below displays all existing projects, and newly created projects will also be displayed here. Clicking the plus sign inside the box before a saved project name will open the project and display all data files collected under that project. Double-clicking a data file will play back the collected data; the main collected data and curves will be displayed on the main interface.

[0060] Creating a new project and entering an existing project: Click the "New Project" button below the project menu to bring up the pop-up. Figure 15 On the interface shown, enter the experiment name, experiment location, and experimenter names, then click the confirm button to complete the creation of the new project. The newly created project name will be displayed in the "Currently In Progress" column. To continue data collection in an existing project, double-click the project name, and the project will appear in the "Currently In Progress" column.

[0061] A data collection experiment can only be performed if a project is displayed in the current project list. The data file name is a string of characters consisting of the year, month, day, hour, and minute at the time of collection. The collected data file will be saved in the currently displayed project.

[0062] Clicking on the test information below will bring up the main information about the project.

[0063] Deleting a project or file: Selecting a project and clicking the delete button will delete the entire project. Opening the project, selecting the file to be deleted, and clicking the delete button will delete the file.

[0064] Print Report: Select the file from which you want to output the report, click Print Report, and the report style is as follows. Figure 16 .

[0065] Gas collection process: Once all preparations are complete, you can begin collecting gas in an existing or newly created project.

[0066] During data collection, simply press the start button. The collection process will proceed automatically according to the set program. The current step sequence will be displayed in the "Current Process" column of the menu bar (Insert needle 1 - Open valve - Vacuum - Close vacuum valve - Open flow meter - Inject gas - Remove needle 1 - Insert needle 2 - Inject liquid - Remove needle 2 - Complete). If the collection bottle is not installed, the program will automatically stop and display a "Collection bottle not installed" message. During vacuuming, the graph on the screen displays the vacuum level versus time curve. During natural gas injection, the graph below displays the set flow rate (white), flow rate (red), and cumulative flow rate (green) over time. During liquid injection, the graph above displays the injection volume versus time curve. Key data during the collection process is also displayed in real time on the right-hand data interface. After collection is complete, a "Collection Completed" message will pop up. Clicking it will automatically save the file to the opened directory.

[0067] If a fault such as needle drop or needle bending occurs during the data acquisition process, immediately press the stop button. The system will shut down the valve, pump, and flow meter, and needles 1 and 2 will automatically return, exiting the data acquisition program. Data acquisition can resume after troubleshooting.

[0068] System files and acquired data files: Software installation: Open My Installer - Volume - run install under the build folder of the installation package, and follow the prompts to install.

[0069] The data files for gas are saved in the "GasOPSystem" folder under the "systeminfo" folder on drive D. All collected data are stored in the "Collected Data" folder, which is further divided into subfolders according to the collection project name. Each collection in the project folder generates a folder automatically named with the collection time (year, month, day, hour, minute), containing four files: AcqSetPara, FinaAcqResult, GasData, and LiquidData. The first two contain the settings and final collected data; the latter two contain the cumulative flow rate of the gas and liquid over time, at 100ms intervals.

[0070] The system files required for the software to run and the data files from gas sampling are stored in the "GasOPSystem" folder under the "systeminfo" folder on drive D. Parameter0-Parameter3 each store four sets of setting parameter combinations. Systeminfo stores the ID of the currently selected setting combination. Report contains report templates. User stores the user's administrator name and password. These cannot be changed or deleted arbitrarily.

[0071] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A rapid on-site tester for hydrogen sulfide in natural gas wells, comprising a USB port, a computer switch, a power switch, an observation window, a sampling bottle mounting bracket, a fan, a power cord socket, a natural gas inlet, and a buffer solution inlet, characterized in that, It also includes the following steps: Step 1: Power on and warm up the tester, check its functions, pre-add gas through the natural gas inlet, pre-add liquid through the buffer solution inlet, and install the sampling bottle at the sampling bottle mounting bracket. Step 2: Debug the software interface and set the system parameters of the interface; Step 3: Manage user login and access permissions for the management software; Step 4: Remove residual liquid from the liquid pump, purge the flow meter to remove residual gas, exit the software, turn off the computer switch, and turn off the power switch.

2. The rapid on-site testing instrument for hydrogen sulfide in natural gas wells according to claim 1, characterized in that, The debugging of the software interface includes purging, pre-injection, pumping out residual liquid, and a stop button. The stop button is electrically connected to purging, pre-injection, and pumping out residual liquid.

3. The rapid on-site testing instrument for hydrogen sulfide in natural gas wells according to claim 2, characterized in that, The debugging of the software interface also includes: When debugging the pulse meter, if the current count value of the pulse meter can be read normally and the count value can be cleared to zero, it is determined that the pulse meter is working and can communicate with the computer master station. Flow meter commissioning, which includes valve control, serial port parameters, flow parameters, and flow settings; I / O module debugging: The I / O module debugging tool includes a probe, vacuum valve, and vacuum pump control button. Liquid flow pump commissioning, which is used to control the speed and direction of the flow pump.

4. The rapid on-site tester for hydrogen sulfide in natural gas wells according to claim 3, characterized in that, The valve control includes a normal position, a closed position, and a purge position. The valve status is displayed in the valve status bar as NORMAL, FLOW-OFF, and PURGE, respectively.

5. The rapid on-site testing instrument for hydrogen sulfide in natural gas wells according to claim 4, characterized in that, The serial port parameters read the communication station number and baud rate of the flow meter.

6. The rapid on-site tester for hydrogen sulfide in natural gas wells according to claim 5, characterized in that, The flow parameter reads the current flow rate and temperature of the valve.

7. The rapid on-site testing instrument for hydrogen sulfide in natural gas wells according to claim 6, characterized in that, The flow meter is set to a flow rate (sccm / s), and its operating range is 0-730 sccm / s. It is used to query the set flow rate value and the full-scale flow rate.

8. The rapid on-site tester for hydrogen sulfide in natural gas wells according to claim 7, characterized in that, The system parameters in the settings interface include setting and saving four sets of acquisition parameters. Each set of acquisition parameters includes vacuuming time, gas flow meter set flow rate, gas volume to be collected, liquid volume to be added, and liquid pump speed. After setting the parameters, save them under the corresponding combination. When applying, select the pre-stored parameter combination and click to confirm use.

9. The rapid on-site tester for hydrogen sulfide in natural gas wells according to claim 8, characterized in that, The user login and access permissions of the management software include modifying the administrator password and adding or deleting operators.

Images