Quantitative dosing drainage gas recovery device for natural gas well

Abstract

The utility model discloses natural gas well quantitative dosing drainage gas recovery device, including concrete foundation platform and a plurality of gas production tree, be equipped with centralized control cabinet and multi -well data acquisition unit of mutual signal connection on concrete foundation platform, multi -well data acquisition unit are connected with gas production tree one to one correspondence, and centralized control cabinet signal connection has multi -pass dosing module and large capacity medicament storage system respectively, and large capacity medicament storage system passes through the import communication of dosing pipeline and multi -pass dosing module, and multi -pass dosing module passes through dosing pipeline and the gas production tree of corresponding gas well one -one intercommunication. The utility model discloses natural gas well quantitative dosing drainage gas recovery device, solves the problem of the prior art that cannot realize quantitative dosing according to gas well real -time production parameter, and the problem that easy to appear overdosing or deficiency.

Description

Technical Field

[0001] This utility model belongs to the technical field of gas field development auxiliary devices, specifically relating to a quantitative chemical dosing and drainage gas production device for natural gas wells. Background Technology

[0002] In recent years, with the continuous growth in demand for natural gas resources, gas field development has gradually extended to complex types of gas reservoirs such as low-permeability, tight, and low-pressure reservoirs. During production in these reservoirs, due to low well pressure, low production, and weak fluid-carrying capacity of the gas flow, fluid accumulation is highly likely to form within the wellbore. This fluid accumulation significantly increases wellbore flow resistance, leading to abnormally high wellhead pressure, a continuous decline in natural gas production, and in severe cases, well shutdown, drastically reducing gas field recovery and development economic benefits.

[0003] Currently, the industry primarily uses traditional methods such as manual and timed dosing to treat fluid buildup in gas wells. Manual dosing relies on staff periodically monitoring and assessing the fluid buildup at the well site and manually adding chemicals. This not only consumes significant manpower but is also susceptible to inaccuracies due to variations in human experience. Insufficient dosing fails to completely remove the fluid, while excessive dosing wastes chemicals and may adversely affect the quality of the natural gas and subsequent processing equipment. Timed dosing, on the other hand, ignores the dynamic changes in fluid volume that occur with production conditions. For example, fluctuations in well production or sudden drops in wellhead pressure can cause rapid changes in fluid volume. Fixed-interval dosing cannot keep up with the demand for fluid treatment, easily leading to unresolved fluid buildup or redundant chemicals.

[0004] In addition, some gas fields have attempted to use simple pressure monitoring devices to assist in chemical dosing. However, these devices can only collect single pressure data and cannot comprehensively judge the liquid accumulation situation by combining key parameters such as production. Furthermore, they lack data storage and analysis capabilities, making it impossible to form a model of liquid accumulation trends, resulting in delayed chemical dosing decisions. At the same time, the connection between traditional chemical dosing devices and wellhead systems is mostly a fixed structure, which is inconvenient for relocation and maintenance and cannot meet the needs of multi-well-location and decentralized development in gas fields. Utility Model Content

[0005] The purpose of this invention is to provide a quantitative chemical dosing and drainage gas production device for natural gas wells, which solves the problem that existing technologies cannot achieve quantitative chemical dosing based on real-time production parameters of the gas well, and are prone to over- or under-dosing.

[0006] The technical solution adopted by this utility model is a natural gas well quantitative chemical dosing and drainage gas production device, including a concrete foundation platform and multiple gas production trees. The concrete foundation platform is equipped with a centralized control cabinet and a multi-well data acquisition unit that are interconnected by signals. The multi-well data acquisition unit is connected to the gas production trees one by one. The centralized control cabinet is connected to a multi-channel chemical dosing module and a large-capacity chemical storage system by signals. The large-capacity drug storage system is connected to the inlet of the multi-channel dosing module via a drug supply pipeline; The multi-path dosing module is connected to the gas production tree of the corresponding gas well through the dosing pipeline.

[0007] The technical solution of this utility model is further characterized by the following: The outlet of the gas production tree is also connected to an external transmission pipeline. The multi-well data acquisition unit includes control valves for each gas well, which are located on the external transmission pipeline of the gas production tree for the corresponding gas well. All control valves are connected to the signal of the centralized control cabinet.

[0008] The large-capacity chemical storage system includes a chemical tank, a level gauge, and a stirrer. The chemical tank is located on one side of a concrete foundation platform. The stirrer is connected to the bottom of the chemical tank, and the level gauge is installed on the inner wall of the chemical tank and connected to the signal of the centralized control cabinet. The inlet of the chemical tank is connected to a chemical inlet pipeline, and the outlet at the bottom of the chemical tank is connected to the inlet of the multi-channel dosing module through a chemical supply pipeline.

[0009] The level gauge is an ultrasonic level sensor.

[0010] The multi-path dosing module includes two independent dosing branches. Each dosing branch is equipped with a variable frequency metering pump, a dosing flow meter, and a valve assembly connected in series along the direction of chemical delivery. The inlet of the variable frequency metering pump is connected to the outlet of the chemical tank through a chemical supply pipeline, and the variable frequency metering pump is connected to the motor drive. The outlet of the valve assembly is connected to the gas production tree of the corresponding gas well through a dosing pipeline. The motor, dosing flow meter, and valve assembly are all connected to a centralized control cabinet.

[0011] A dosing control valve is installed near the inlet of the gas production tree on the dosing pipeline.

[0012] The variable frequency metering pump has a dosing range of 0-80 L / h and an accuracy of ±0.5 L / h; the valves in the valve group are both manual and electric control valves.

[0013] The concrete foundation platform is also equipped with safety protection components, including a gas leak detector. The gas leak detector is installed above the concrete foundation platform between the centralized control cabinet and the multi-channel dosing module, and is connected to the signal of the centralized control cabinet.

[0014] Compared with the prior art, the beneficial effects of this utility model are: (1) The natural gas well quantitative chemical dosing and drainage gas production device provided by this utility model can collect production parameters such as pressure and flow rate of each gas well in real time through a multi-well data acquisition unit, and transmit them to a centralized control cabinet through signals. Based on the collected parameters, it sends precise chemical dosing instructions to the multi-channel chemical dosing module, breaking the limitations of traditional chemical dosing that relies on manual experience or fixed dosage, and ensuring that the chemical dosing amount matches the real-time needs of the gas well. At the same time, through the chemical dosing flow meter set in the multi-channel chemical dosing module and the signal connection with the centralized control cabinet, the actual chemical dosing amount can be fed back in real time; the control cabinet dynamically adjusts the chemical dosing rate of the variable frequency metering pump, effectively avoiding the problem of over-dosing or under-dosing.

[0015] (2) The natural gas well quantitative chemical dosing and drainage gas production device provided by this utility model can serve 4 gas wells at the same time. Compared with configuring the device separately for each well, the equipment investment is reduced by more than 60%, and the land area is only 30% of that of the decentralized configuration, which greatly reduces the equipment and land costs of fixed well sites.

[0016] (3) The natural gas well quantitative chemical dosing drainage and gas production device provided by this utility model has different real-time production parameters for different gas wells. Through the design of independent data acquisition and chemical dosing branch for each well, this device can calculate and execute the chemical dosing amount separately for the real-time working conditions of each gas well. This solves the problem that the traditional "one-size-fits-all" chemical dosing is difficult to adapt to the differentiated needs of multiple wells, ensuring that the chemical dosing amount for each gas well is neither excessive nor insufficient. While ensuring the drainage and gas production effect, it maximizes the reduction of chemical consumption costs. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the natural gas well quantitative chemical dosing and drainage gas production device of this utility model; In the diagram, 1. Gas source tree, 2. Control valve, 3. External transmission pipeline, 4. Dosing control valve, 5. Dosing pipeline, 6. Valve assembly, 7. Centralized control cabinet, 8. Gas leak detector, 9. Multi-channel dosing module, 10. Variable frequency metering pump, 11. Motor, 12. Dosing supply pipeline, 13. Dosing tank, 14. Level gauge, 15. Inlet pipeline. Detailed Implementation

[0018] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0019] This utility model provides a device for quantitative chemical dosing and drainage gas production in natural gas wells, such as... Figure 1As shown, the system includes a concrete foundation platform and multiple gas production trees 1. The concrete foundation platform is equipped with a centralized control cabinet 7 and a multi-well data acquisition unit, all interconnected by signal connection. Each multi-well data acquisition unit is connected to a gas production tree 1 in a one-to-one correspondence. The centralized control cabinet 7 is signal-connected to a multi-channel dosing module 9 and a large-capacity reagent storage system. The large-capacity reagent storage system is connected to the inlet of the multi-channel dosing module 9 via a dosing pipeline 12. The multi-channel dosing module 9 is connected to the corresponding gas production tree 1 via a dosing pipeline 5. The outlet of each gas production tree 1 is also connected to an external transmission pipeline 3. The multi-well data acquisition unit includes a control valve 2 corresponding to each gas well, with each control valve 2 located on the external transmission pipeline 3 of the corresponding gas production tree 1. All control valves 2 are signal-connected to the centralized control cabinet 7. The large-capacity chemical storage system includes a chemical tank 13, a level gauge 14, and a stirrer. The chemical tank 13 is located on one side of a concrete foundation platform. The stirrer is connected to the bottom of the chemical tank, and the level gauge 14 is installed on the inner wall of the chemical tank and connected to the signal of the centralized control cabinet 7. The inlet of the chemical tank 13 is connected to a chemical inlet pipeline 15, and the bottom outlet of the chemical tank 13 is connected to the inlet of the multi-channel dosing module 9 through a chemical supply pipeline 12. The level gauge 14 is an ultrasonic level sensor; the multi-channel dosing module 9 includes two independent dosing branches, each of which is connected in series along the dosing direction with a frequency converter metering pump 10, a dosing flow meter, and a valve group 6; the inlet of the frequency converter metering pump 10 is connected to the outlet of the dosing tank 13 through the dosing pipeline 12, and the frequency converter metering pump 10 is connected to the motor 11 for transmission; the outlet of the valve group 6 is connected to the gas production tree 1 of the corresponding gas well through the dosing pipeline 5; the motor, the dosing flow meter, and the valve group 6 are all connected to the centralized control cabinet 7; a dosing control valve 4 is provided near the inlet of the gas production tree 1 on the dosing pipeline 5; the dosing range of the frequency converter metering pump 10 is 0-80L / h, and the accuracy is ±0.5L / h; all valves in the valve group 6 are manual / electric dual-control valves.

[0020] The concrete foundation platform is also equipped with safety protection components, including a gas leak detector 8. The gas leak detector 8 is installed above the concrete foundation platform between the centralized control cabinet 7 and the multi-channel dosing module 9, and is connected to the centralized control cabinet 7 by signal.

[0021] The working principle of this utility model is as follows: The control valves 2 in the multi-well data acquisition unit are installed on the outlet pipelines of each gas well's production tree 1. They collect production parameters such as pressure and flow rate of the corresponding gas well in real time and transmit them to the centralized control cabinet 7 via wired Ethernet. The centralized control cabinet 7 analyzes the real-time parameters to determine the liquid accumulation status of a single well, generates a quantitative dosing command for the corresponding gas well, and sends it to the multi-path dosing module 9 and the reagent tank 13 of the large-capacity reagent storage system. The stirrer continuously stirs to prevent reagent sedimentation, and the level gauge 14 monitors the remaining amount in real time and feeds it back to the centralized control cabinet 7. The reagent is delivered to the inlet of the multi-path dosing module 9 via the supply pipeline 12. In the multi-path dosing module 9, the variable frequency metering pump 10 adjusts the dosing rate from 0-80L / h according to the command. The reagent is delivered to the corresponding production tree 1 via the dosing flow meter, valve group 6, and dosing pipeline 5 to achieve directional and quantitative dosing. At the same time, the gas leak detector 8 monitors the gas concentration in real time. When it reaches the 10% LEL alarm threshold, it sends a signal to the control cabinet to trigger an alarm and shut down the dosing equipment.

[0022] Example 1 This embodiment provides a natural gas well quantitative chemical dosing and drainage gas production device, such as... Figure 1 As shown, the system includes a concrete foundation platform and multiple gas production trees 1. The concrete foundation platform is equipped with a centralized control cabinet 7 and a multi-well data acquisition unit that are interconnected by signals. The multi-well data acquisition unit is connected to the gas production tree 1 in a one-to-one correspondence. The centralized control cabinet 7 is connected to a multi-channel dosing module 9 and a large-capacity reagent storage system. The large-capacity reagent storage system is connected to the inlet of the multi-channel dosing module 9 through a dosing pipeline 12. The multi-channel dosing module 9 is connected to the gas production tree 1 of the corresponding gas well through a dosing pipeline 5.

[0023] Example 2 Based on Example 1, the outlet of the gas production tree 1 is also connected to an external transmission pipeline 3. The multi-well data acquisition unit includes a control valve 2 corresponding to each gas well. The control valve 2 is respectively located on the external transmission pipeline 3 of the gas production tree 1 of the corresponding gas well. The control valve 2 is connected to the centralized control cabinet 7 via signal.

[0024] Among them, control valve 2 is a Siemens SIPART PS2 electric regulating valve, installed on the external transmission pipeline of the corresponding gas well production tree. It has the function of real-time acquisition of dual parameters of pressure and flow rate, with a pressure measurement range of 0-10MPa and a flow rate measurement range of 0-10×10 4 m 3 / d, supports remote control of valve opening; equipped with data transmission: uses wired Ethernet to upload single-well pressure and flow data to centralized control cabinet 7, with a collection frequency of 1 time / minute, and also has local data caching function.

[0025] Example 3 Based on Example 2, the large-capacity pharmaceutical storage system includes a pharmaceutical tank 13, a level gauge 14, and a stirrer. The pharmaceutical tank 13 is located on one side of a concrete foundation platform. The stirrer is connected to the bottom of the pharmaceutical tank, and the level gauge 14 is installed on the inner wall of the pharmaceutical tank and connected to the centralized control cabinet 7 via a signal connection. A drug inlet pipeline 15 is connected to the inlet of the pharmaceutical tank 13, and the bottom outlet of the pharmaceutical tank 13 is connected to the inlet of the multi-channel dosing module 9 via a drug supply pipeline 12. The level gauge 14 is an ultrasonic level sensor.

[0026] The reagent tank 13 has a volume of 2000L and is made of 304 stainless steel. The level gauge 14 is a JCS-08 ultrasonic level gauge, which monitors the remaining reagent level in real time and can send replenishment signals to the centralized control cabinet 7. The agitator inside the reagent tank 13 has a power of 0.5KW and a speed of 60r / min to prevent reagent sedimentation and ensure uniform reagent concentration. The dosing line 5, inlet line 12, and supply line 15 all use L245N seamless steel pipes, with a design pressure of 8-10MPa.

[0027] Example 4 Based on Example 3, the multi-path dosing module 9 includes two independent dosing branches. Each dosing branch is equipped with a variable frequency metering pump 10, a dosing flow meter, and a valve group 6 connected in series along the dosing delivery direction. The inlet of the variable frequency metering pump 10 is connected to the outlet of the dosing tank 13 through the dosing pipeline 12, and the variable frequency metering pump 10 is connected to the motor 11 for transmission. The outlet of the valve group 6 is connected to the gas production tree 1 of the corresponding gas well through the dosing pipeline 5. The motor 11, the dosing flow meter, and the valve group 6 are all connected to the centralized control cabinet 7. A dosing control valve 4 is provided near the inlet of the gas production tree 1 on the dosing pipeline 5.

[0028] The multi-path dosing module 9 is equipped with two independent dosing branches, which are integrated into a stainless steel frame with dimensions of 2m×1.5m×1.2m. The valve group includes four valves, each located on a separate dosing branch, and adopts a manual / electric dual control structure, which can independently control the on / off of the corresponding dosing branch, so that the agent is delivered to the gas production tree of the target gas well in a directional manner, which facilitates the maintenance of the dosing branch of a single well (closing a branch does not affect the normal dosing of other gas wells).

[0029] In each dosing branch, the dosing flow meter must be installed on the outlet side of the variable frequency metering pump 10, and the distance between the two shall be ≤1 meter; a DN15 check valve shall be connected in series between the variable frequency metering pump 10 and the dosing flow meter to prevent the agent from flowing back when the pump stops or the pressure fluctuates, so as to avoid affecting the metering accuracy or damaging the pump body.

[0030] Example 5 Based on Example 4, the dosing range of the variable frequency metering pump 10 is 0-80L / h, with an accuracy of ±0.5L / h; all four valves in the valve group 6 are both manual and electric dual-control valves; a safety protection component is also provided on the concrete foundation platform, which includes a gas leak detector 8. The gas leak detector 8 is installed above the concrete foundation platform between the centralized control cabinet 7 and the multi-channel dosing module 9, and is connected to the centralized control cabinet 7 by signal.

[0031] Example 6 This embodiment provides a quantitative chemical dosing and drainage gas production device for natural gas wells, implemented as follows: First, a C30 concrete foundation platform measuring 5m long × 3m wide × 0.5m high is constructed. The surface of the concrete foundation platform is treated with anti-corrosion coating to support all equipment. The multi-well data acquisition unit adopts a Siemens SIPART PS2. Electric regulating valves are installed on the external transmission pipeline 3 of the gas production tree 1 of the gas well; the centralized control cabinet 7 is a TRD-XG-PLC-01 product, which integrates a Siemens S7-1200 PLC controller, a 10-inch TPC1061H touch screen and a 1TB data storage server, which can realize multi-well data split display, historical data query and alarm functions. It establishes a wired Ethernet connection with each Siemens S7-1200 PLC electric regulating valve through a Category 5e shielded network cable; the bottom of the chemical tank 13 is equipped with a DN50 outlet flange, and the built-in agitator is installed at the bottom of the chemical tank 13. The level gauge is a JCS-08 ultrasonic level gauge, and the ultrasonic level gauge signal is sent to the centralized control cabinet 7; the multi-channel dosing module is integrated in a stainless steel frame, including 2 frequency conversion metering pumps and dosing flow meters, as well as 4 sets of Z941H-16C DN20 manual / electric dual control valve groups, one set for each gas well.

[0032] Turn on the power to the centralized control cabinet 7, and set the parameters for each well. Input the reference pressures for wells 1-4 respectively: Well 1: 3.2MPa, Well 2: 2.8MPa, and the reference production for well 1: 2.5×10⁻⁶. 4 m 3 / d, Well 2: 1.8×10 4 m 3 / d, set data acquisition 1 time / minute, alarm threshold, main tank low liquid level 20%, leakage concentration 10%LEL; after the operator selects the target gas well (e.g., well 1 - well 4), manually enters the calculated value in the corresponding parameter input box, and confirms and saves, the parameter is automatically synchronized to the Siemens S7-1200 PLC controller as the benchmark for calculating the liquid accumulation index L; then inject foam drainage agent into the chemical tank 13 to 80% liquid level, start the agitator, and run the agitator for 30-35 minutes to ensure uniform chemical agent distribution; First, a single-well liquid accumulation scenario was simulated by closing the chemical dosing valve of well 1 and reducing its production to 1.8 × 10⁻⁶.4 m 3 / d, the pressure is adjusted to 2.5 MPa, and the control cabinet acquires the liquid loading index L, wherein the liquid loading index L = [(P0-P) / P0]×100% + [(Q-Q0) / Q0]×100%; P is real-time pressure, P0 is reference pressure, which is the average wellhead pressure within the stable production cycle of the first 3 months after the gas well is put into production; Q is real-time production of the gas well, Q0 is reference production, which is the average daily gas production in the same period; the dosing amount is determined by the liquid loading index L.

[0033] Wherein, when L ≤ 5%: the gas well has no liquid loading, and no dosing is required; When 5% < L ≤ 20%: the gas well has mild liquid loading, requiring low-dose dosing; When 20% < L ≤ 40%: the gas well has moderate liquid loading, requiring medium-dose dosing; When L > 40%: the gas well has severe liquid loading, requiring high-dose dosing.

[0034] Quantitative dosing G is calculated by combining the gas well production Q with the liquid loading grade corresponding to the liquid loading index L to obtain the dosing amount per unit time: Mild liquid loading (5% < L ≤ 20%): G = 0.02 × Q (unit: L / h, unit of Q: 10 4 m³ / d); Moderate liquid loading (20% < L ≤ 40%): G = 0.05 × Q (unit: L / h, unit of Q: 10 4 m³ / d); Severe liquid loading (L > 40%): G = 0.1 × Q (unit: L / h, unit of Q: 10 4 m³ / d).

[0035] The centralized control cabinet obtained that the liquid loading index L is 6.12%, and determined it as abnormal production; adjusted the pressure of Well 2 to 2.1 MPa, 1.4×10 4 m 3 / d, obtained that the liquid loading index L of Well 2 is 2.78%, determined as no liquid loading, and the dosing branch does not start; continued to adjust the pressure of Well 3 to 31.8 MPa, 1.2×10 4 m 3 / d, obtained that the liquid loading index of Well 3 is approximately 35%, which is moderate liquid loading. The centralized control cabinet sends an instruction to the dosing branch of Well 3, the variable frequency metering pump operates at a rate of 100.06 L / h, the actual flow fed back by the dosing flowmeter is consistent with the set value, and the commissioning is qualified.

[0036] The daily operation mode of the entire well is as follows: the multi-well data acquisition unit collects pressure and production data of wells 1-4 in real time and uploads them to the centralized control cabinet 7 every minute; the centralized control cabinet 7 obtains the liquid accumulation index L for each gas well, independently judges the liquid accumulation level, and sends a dosing command to the corresponding dosing branch 9: for example, the real-time parameters of well 4 are P=1.5MPa and Q=1.0×10. 4 m 3 / d (Base P0 = 2.5 MPa, Q0 = 1.5 × 10⁻⁶) 4 m 3 / d), resulting in L=40%-33.33%=6.67%, which is a slight accumulation of fluid. The dosage of the chemical added is G=0.02×1.0=0.02L / h, and the chemical addition branch of well 4 is started; During operation, staff can view the real-time parameters (pressure, production, dosage) and reagent level of the four gas wells through the 7-screen touch screen of the centralized control cabinet. When the tank level is below 20%, the system can switch to the backup tank for reagent supply and issue a main tank replenishment alarm. Staff must replenish the main tank reagent within 24 hours.

[0037] Manual mode operation (special working conditions): When a gas well experiences a control valve 2 malfunction or an interruption in well 2 pressure data, the operator can use manual mode, select "well 2", enter the target dosage, and click to start dosing. The well 2 dosing branch will run at the set rate. During manual operation, the operator needs to inspect the pressure and production of well 2 on-site every 30 minutes and adjust the dosage according to the actual situation.

[0038] In this embodiment, the PLC built into the centralized control cabinet is connected to the control valve of each gas well in the multi-well data acquisition unit via a wired Ethernet network constructed with Cat5e shielded network cable. It receives gas well pressure and flow signals collected by the control valve in real time. At the same time, the PLC is connected to the variable frequency metering pump, dosing flow meter and valve group of the multi-channel dosing module through signal lines. It sends variable frequency signals to the variable frequency metering pump to adjust the dosing rate, with a dosing range of 0-80L / h and an accuracy of ±0.5L / h. It receives the actual dosing amount signal fed back by the dosing flow meter and sends on / off signals to the valve group to control the directional delivery of the agent. The dosing control valve near the gas tree inlet of the dosing pipeline is also connected to the PLC signal to open the final dosing path. In addition, the PLC is also connected to the ultrasonic level gauge signal on the inner wall of the agent tank in the large-capacity agent storage system to receive agent balance data, and to the agitator signal at the bottom of the agent tank to control its start and stop (to prevent agent sedimentation). It is also connected to the gas leak detector signal on the concrete foundation platform to receive gas concentration signals. The PLC is also connected to the 10-inch TPC1061H touchscreen in the centralized control cabinet via wired Ethernet. It transmits real-time data such as pressure, flow rate, actual dosage, remaining dosage, and gas concentration of each gas well, as well as calculated liquid accumulation index, liquid accumulation level, target dosage, and equipment operating status to the touchscreen in real time. Operators can view this data intuitively on the touchscreen and operate it to preset the benchmark pressure, benchmark production, and alarm thresholds for each gas well. When the automatic mode fails, it can switch to manual mode and input the target dosage. It can also query historical operating data and alarm records.

[0039] The PLC synchronously detects the deviation between the current actual dosage and the target dosage. If the deviation is greater than ±1L / h, manual adjustment to the target value is required before switching. Operators must manually adjust the speed of the variable frequency metering pump to control the deviation within ±1L / h before confirming the switch. After confirming the switch, the PLC immediately cuts off the automatic adjustment signal, retaining the currently manually input dosage value (input range 0-80L / h, adjustment step 0.1L / h, supporting precise control). During the switch, the PLC's built-in flow smoothing algorithm is activated, gradually adjusting the motor frequency of the variable frequency metering pump to ensure that the dosage flow fluctuation is ≤±0.2L / h, avoiding sudden flow changes that could lead to instability in the gas well's operating conditions.

Claims

1. A natural gas well quantitative chemical dosing and drainage gas production device, comprising a concrete foundation platform and multiple gas production trees (1), characterized in that, The concrete foundation platform is equipped with a centralized control cabinet (7) and a multi-well data acquisition unit that are interconnected by signals; the multi-well data acquisition unit is connected to the gas production tree (1) in a one-to-one correspondence; the centralized control cabinet (7) is connected by signals to a multi-channel dosing module (9) and a large-capacity reagent storage system respectively. The large-capacity drug storage system is connected to the inlet of the multi-channel drug delivery module (9) via the drug supply pipeline (12); The multi-path dosing module (9) is connected to the gas production tree (1) of the corresponding gas well through the dosing pipeline (5).

2. The natural gas well quantitative chemical dosing and drainage gas production device according to claim 1, characterized in that, The outlet of the gas production tree (1) is also connected to an external transmission pipeline (3). The multi-well data acquisition unit includes a control valve (2) corresponding to each gas well. The control valve (2) is respectively located on the external transmission pipeline (3) of the gas production tree (1) of the corresponding gas well. The control valve (2) is connected to the centralized control cabinet (7) via signal.

3. The natural gas well quantitative chemical dosing and drainage gas production device according to claim 1, characterized in that, The large-capacity drug storage system includes a drug tank (13), a level gauge (14), and a stirrer; the drug tank (13) is located on one side of a concrete foundation platform; the stirrer is connected to the bottom of the drug tank, and the level gauge (14) is installed on the inner wall of the drug tank (13) and connected to the signal of the centralized control cabinet (7); the inlet of the drug tank (13) is connected to a drug inlet pipeline (15), and the bottom outlet of the drug tank (13) is connected to the inlet of the multi-channel drug dosing module (9) through a drug supply pipeline (12).

4. The natural gas well quantitative chemical dosing and drainage gas production device according to claim 3, characterized in that, The level gauge (14) is an ultrasonic level sensor.

5. The natural gas well quantitative chemical dosing and drainage gas production device according to claim 1, characterized in that, The multi-path dosing module (9) includes two independent dosing branches. Each dosing branch is equipped with a variable frequency metering pump (10), a dosing flow meter, and a valve group (6) connected in series along the dosing delivery direction. The inlet of the variable frequency metering pump (10) is connected to the outlet of the dosing tank (13) through the dosing pipeline (12). The variable frequency metering pump (10) is connected to the motor (11) for transmission. The outlet of the valve group (6) is connected to the gas production tree (1) of the corresponding gas well through the dosing pipeline (5). The motor (11), the dosing flow meter, and the valve group (6) are all connected to the centralized control cabinet (7).

6. The natural gas well quantitative chemical dosing and drainage gas production device according to claim 5, characterized in that, The dosing pipeline (5) is equipped with a dosing control valve (4) near the inlet of the gas collection tree (1).

7. The natural gas well quantitative chemical dosing and drainage gas production device according to claim 5, characterized in that, The dosing range of the variable frequency metering pump (10) is 0-80L / h, and the accuracy is ±0.5L / h; the valves in the valve group (6) are all manual and electric dual-control valves.

8. The natural gas well quantitative chemical dosing and drainage gas production device according to claim 1, characterized in that, The concrete foundation platform is also equipped with a safety protection component, which includes a gas leak detector (8). The gas leak detector (8) is installed above the concrete foundation platform between the centralized control cabinet (7) and the multi-channel dosing module (9), and is connected to the centralized control cabinet (7) by signal.

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