A chemical dosing device and method for oil and gas wellheads

Abstract

This invention discloses an oil and gas wellhead chemical dosing device and method, relating to the field of petroleum-related technologies. The oil and gas wellhead chemical dosing device includes a U-shaped delivery pipe fixed to the outer wall of a chemical storage tank. A narrow-diameter pipe is fixed to the input end of the delivery pipe, and an input pipe is fixed to the end of the narrow-diameter pipe away from the delivery pipe. A reducing pipe is fixed to the output end of the delivery pipe, and the reducing pipe is connected to a mixing and discharge mechanism installed in a mixing tank. A pulsed airflow is generated by the intermittent exhaust mechanism linked to the narrow-diameter pipe in a Venturi structure. Combined with the dynamic suspension support design of the perforated bearing plate, the pulsed airflow continuously disturbs the surface of the chemical agent. With the dynamic fitting characteristic of the bearing plate automatically sinking as the chemical agent is consumed, the problem of clumping, caking, and uneven dispersion of powdered chemical agents in traditional dosing devices is completely solved. The chemical agent is transported in a floating dust state throughout the process, which greatly improves the subsequent dissolution efficiency and mixing uniformity of the chemical agent.

Description

Technical Field

[0001] This invention relates to the field of petroleum-related technologies, specifically to an oil and gas wellhead chemical dosing device and method. Background Technology

[0002] During oil and gas field development, it is necessary to administer corrosion slowing, scale prevention, and viscosity reducing agents through chemical dosing devices to address issues such as scaling and corrosion in wellhead pipelines. For scattered wellheads in the field, vehicle-mounted mobile dosing equipment is often suitable. However, existing oil and gas wellhead chemical dosing devices have several shortcomings. For example, a continuous wellhead chemical dosing device and its dosing method (announcement number CN112228009A) uses a conventional structure with a storage tank, mechanical agitation, and a power pump for delivery. In practical applications, this device exhibits five major defects: 1. Powdered medicines are easily loosened by mechanical stirring alone, but they are prone to clumping and hardening, have poor dispersibility, dissolve slowly during mixing, and are prone to precipitation; Second, mechanical stirring can easily generate temperature rise and shear force, which can destroy the activity of heat-sensitive agents and cause the agents to become ineffective. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides an oil and gas wellhead chemical dosing device and method, which solves the problems of powdered chemicals being loosened by mechanical stirring alone, easily clumping and hardening, having poor dispersibility, slow dissolution during mixing, and easy precipitation.

[0004] To achieve the above objectives, the present invention provides the following technical solution: an oil and gas wellhead chemical dosing device, comprising a chemical storage tank and a mixing tank, both of which are mounted on a loading vehicle via brackets, and further comprising: A U-shaped conveying pipe is fixed to the outer wall of the medicine storage box. A narrow pipe is fixed to the input end of the conveying pipe, and an input pipe is fixed to the end of the narrow pipe away from the conveying pipe. A reducing pipe is fixed to the output end of the conveying pipe. The reducing pipe is connected to the mixing and discharging mechanism installed in the mixing box. A solenoid valve is fixed to the bottom of the reducing pipe. The solenoid valve is fixed and connected to the dust collection component fixed in the medicine storage box. The No. 1 gas supply pipe runs through the bottom of the medicine storage box and is fixed thereto. The No. 1 gas supply pipe is connected to the narrow pipe through an intermittent exhaust mechanism. The intermittent exhaust mechanism supplies gas that is being transported in the narrow pipe to the No. 1 gas supply pipe intermittently.

[0005] Furthermore, a second air supply pipe is provided on the first air supply pipe in a sealing sliding sleeve. The second air supply pipe and the first air supply pipe are fitted with a clearance. Multiple third air supply pipes are fixed circumferentially on the second air supply pipe. Multiple nozzles connected to the third air supply pipes are fixed circumferentially on the third air supply pipes. The second air supply pipe is installed at an angle. The No. 2 gas supply pipe is also equipped with a support plate fixed by a bracket.

[0006] Furthermore, the intermittent exhaust mechanism includes a rotating cylinder rotatably installed inside the narrow tube. Multiple second exhaust ports are equidistantly opened on the circumference of the rotating cylinder, and a first exhaust port that cooperates with the second exhaust ports is opened on the narrow tube. Multiple spiral force-bearing strips are equidistantly fixed on the inner wall of the rotating cylinder. A gap connecting sleeve is fitted onto the narrow tube, and the gap connecting sleeve is fixed and connected to the No. 1 air supply tube.

[0007] Furthermore, the mixing emission mechanism includes an L-shaped emission pipe, which is fixed and connected to the reducer pipe, with the end of the emission pipe away from the reducer pipe inserted into the eccentric part of the mixing box; The discharge pipe has multiple air outlets at equal intervals at the end away from the reducer. The mixing chamber is equipped with a drug dispensing assembly.

[0008] Furthermore, the dispensing assembly includes a dispensing pipe disposed at the eccentric position of the mixing chamber, the dispensing pipe passing through the mixing chamber and fixed thereto, and a siphon tube disposed inside the mixing chamber, the siphon tube being sleeved on the dispensing pipe and fixed to the inner wall of the mixing chamber.

[0009] Furthermore, a partition is fixed to the inner wall of the medicine storage box, and the liquid outlet pipe and siphon pipe are located on the inner wall of the partition.

[0010] Furthermore, guide wheels are rotatably installed on both the inner and outer walls of the medicine storage box. A through hole is opened between the two guide wheels on the medicine storage box. A sliding sealing cylinder is installed in the through hole. A pull rope is slidably installed inside the sliding sealing cylinder. One end of the pull rope is fixed to the bearing plate, and the other end is outside the medicine storage box.

[0011] Furthermore, a counterweight ball is fixed to the end of the pull rope away from the bearing plate, and a U-shaped piece that cooperates with the counterweight ball is fixed to the outer wall of the medicine storage box.

[0012] Furthermore, the dust collection component is horn-shaped, with its smaller diameter end connected to a reducing pipe via a solenoid valve, and its larger diameter end located inside the medicine storage tank.

[0013] The present invention also provides a method for adding chemicals at the wellhead of an oil and gas well, using the aforementioned chemical addition device, comprising the following steps: Step 1: Pull the rope to raise the support plate, add powdered medicine through the medicine tank's dispensing port, loosen the rope to reset the support plate and seal the dispensing port, completing the pre-filling of medicine; Step 2: Start the air pump. The airflow drives the intermittent exhaust mechanism through the narrow tube, forming a pulsed airflow that fluidizes the medicine in the medicine tank through the No. 1 and No. 2 air supply pipes. The variable diameter pipe uses the negative pressure effect, in conjunction with the solenoid valve to regulate the flow rate, to draw in the powdery medicine and mix it with the airflow. Step 3: The mixed gas is introduced into the mixing box to form a vortex for mixing. After the liquid level of the mixture reaches the standard, it is automatically siphoned out through the siphon pipe and the liquid outlet pipe.

[0014] The present invention has the following beneficial effects: I. This oil and gas wellhead chemical dosing device utilizes a narrow-tube intermittent exhaust mechanism in a Venturi structure to generate pulsed airflow. Combined with a perforated bearing plate with dynamic suspension support design, the pulsed airflow continuously disturbs the surface of the chemical agent. The bearing plate automatically sinks as the chemical agent is consumed, thus completely solving the problems of powdered chemical agent clumping, caking, and uneven dispersion in traditional dosing devices. This allows the chemical agent to be transported in a floating dust state throughout the process, significantly improving the subsequent dissolution efficiency and mixing uniformity of the chemical agent. There is no need for manual periodic loosening of the chemical agent, making it suitable for long-term continuous dosing conditions.

[0015] II. This oil and gas wellhead chemical dosing device utilizes a single power source, an air pump, to drive the spiral force bar to rotate the rotating cylinder and generate pulsed airflow. It also uses the Bernoulli effect of the tapered variable diameter pipe to create negative pressure for chemical adsorption. Based on the principles of fluid mechanics, the device achieves self-operation. With the help of a solenoid valve, the flow rate is precisely controlled. This simplifies the overall structure, reduces the equipment failure rate, and significantly reduces energy consumption and maintenance costs at the oil and gas wellhead.

[0016] Third, this oil and gas wellhead chemical dosing device abandons the traditional mechanical stirring and mixing method. It adopts an L-shaped discharge pipe with eccentric jetting to drive the water to form a vortex mixing mode. There is no mechanical shearing force or frictional heating during the mixing process, which completely avoids the problem of thermally sensitive and easily decomposable agents failing and degrading due to heat generation and structural shearing caused by stirring. At the same time, the vortex turbulent mixing is more uniform, with no local precipitation or agent residue, and is suitable for the mild ratio requirements of various oil and gas wellhead special agents.

[0017] IV. This oil and gas wellhead chemical dosing device utilizes the centrifugal force generated by the rotation of a vortex to centrifugally gather large, insoluble particles of impurities in the chemical solution to the center of the mixing tank. Combined with an eccentrically positioned siphon pipe and outlet pipe, it automatically discharges the chemical solution based on the siphon principle, achieving fully automatic separation of impurities from qualified chemical solution. No additional filtration device is required, and no manual cleaning of impurities is needed. This effectively prevents impurities from clogging the wellhead chemical dosing pipeline, significantly reduces the frequency of on-site downtime maintenance, and improves the continuity of chemical dosing operations.

[0018] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 for Figure 1 A structural diagram from another direction; Figure 3 for Figure 1 Another structural diagram from another angle; Figure 4This is a cross-sectional view of the medicine storage box and mixing box in this invention; Figure 5 for Figure 4 A structural diagram from another direction; Figure 6 This is a schematic diagram of the internal structure of the medicine storage box and mixing chamber of the present invention; Figure 7 This is a schematic diagram of the intermittent exhaust mechanism in this invention; Figure 8 This is a cross-sectional view of the No. 2 gas supply pipe in this invention; Figure 9 This is a schematic diagram of the structure of the first limiting block and the second limiting block in this invention; Figure 10 This is a schematic diagram of the partition structure in this invention; Figure 11 This is a schematic diagram of the siphon tube and the liquid outlet tube in this invention; Figure 12 This is a schematic diagram of the U-shaped component in this invention.

[0020] In the diagram: 1. Medicine storage tank; 101. Dispensing port; 2. Mixing tank; 201. Baffle plate; 3. Conveying pipe; 4. Reducing pipe; 401. Solenoid valve; 5. Discharge pipe; 501. Air outlet; 6. Pull rope; 601. Counterweight ball; 602. Guide wheel; 603. Sliding sealing cylinder; 604. U-shaped component; 7. Medium-narrow pipe; 701. No. 1 exhaust port; 702. Rotating cylinder; 703. No. 2 exhaust port; 704. Spiral force-bearing strip; 705. Gap connecting sleeve; 8. Input pipe; 9. No. 1 air supply pipe; 901. No. 2 air supply pipe; 902. No. 3 air supply pipe; 903. Support plate; 904. Nozzle; 905. No. 1 limit block; 906. No. 2 limit block; 10. Liquid outlet pipe; 1001. Siphon pipe; 11. Dust collection component. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] In the description of this invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "around", etc., which indicate orientation or positional relationship, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this invention.

[0023] The following is based on Figures 1-12 This invention describes the oil and gas wellhead chemical dosing device provided in an embodiment of the invention.

[0024] like Figures 1-12 As shown, this embodiment of the invention provides a technical solution: an oil and gas wellhead chemical dosing device, including a chemical storage tank 1 and a mixing tank 2, both of which are mounted on a loading vehicle via brackets, and further includes: A U-shaped conveying pipe 3 is fixed to the outer wall of the medicine storage box 1. A narrow pipe 7 is fixed to the input end of the conveying pipe 3. An input pipe 8 is fixed to the end of the narrow pipe 7 away from the conveying pipe 3. A reducing pipe 4 is fixed to the output end of the conveying pipe 3. The reducing pipe 4 is connected to the mixing and discharging mechanism installed in the mixing box 2. A solenoid valve 401 is fixed to the bottom of the reducing pipe 4. The solenoid valve 401 is fixed and connected to the dust collection component 11 fixed in the medicine storage box 1. A first gas supply pipe 9 runs through the bottom of the medicine storage box 1 and is fixed thereto. The first gas supply pipe 9 is connected to the narrow pipe 7 through an intermittent exhaust mechanism. The gas transported in the narrow pipe 7 is intermittently supplied to the first gas supply pipe 9 through the intermittent exhaust mechanism.

[0025] In this embodiment of the invention, an air pump is fixed on the medicine storage box 1. The output end of the air pump is fixed and connected to the input pipe 8. When the air pump is working, it pumps air into the input pipe 8 through the output end. The gas in the input pipe 8 enters the mixing and discharge mechanism through the narrow pipe 7, the conveying pipe 3, and the variable diameter pipe 4 in sequence. When the gas passes through the reducer pipe 4, since the reducer pipe 4 is a tapered pipe with a diameter larger than that of the other end, the airflow forms a negative pressure effect during acceleration. The Bernoulli effect is used to draw the medicine stored in the medicine storage tank 1 into the reducer pipe 4 through the dust collection device 11, and transport it to the mixing and emission mechanism along with the airflow to achieve uniform mixing of medicine and gas. When the gas passes through the narrow tube 7, the airflow is accelerated in the narrow section because the narrow tube 7 is a Venturi tube with large diameters at both ends and small diameter in the middle. The gas is intermittently discharged through the No. 1 gas supply pipe 9 by the intermittent exhaust mechanism, so that the drug spray presents a pulse rhythm. The powdered drug stored in the drug storage tank 1 is pulsed and sprayed onto it, so that the drug forms floating dust. When the solenoid valve 401 draws in the gas in the drug storage tank 1 through the dust collection component 11, it actually draws the powdered drug floating in the drug storage tank 1 into the variable diameter pipe 4 along with the gas, ensuring that the drug enters the mixing and emission mechanism in a highly dispersed state. Secondly, the solenoid valve 401 can control the airflow and dust flow between the medicine storage tank 1 and the variable diameter pipe 4, thereby precisely regulating the drug delivery rate and mixing concentration. The achieved technical effect is that by adding the agent as atomized dust to the mixing and emission mechanism and mixing it with water, the dissolution rate and distribution uniformity of the agent in water are significantly improved, and clumping or precipitation is avoided.

[0026] The No. 1 air supply pipe 9 is fitted with a No. 2 air supply pipe 901 in a sealing sliding sleeve. The No. 2 air supply pipe 901 and the No. 1 air supply pipe 9 are fitted with a clearance. Multiple No. 3 air supply pipes 902 are fixed circumferentially on the No. 2 air supply pipe 901. Multiple nozzles 904 connected to the No. 3 air supply pipes 902 are fixed circumferentially on the No. 3 air supply pipes 902. The No. 2 air supply pipe 901 is installed at an angle. The No. 2 gas supply pipe 901 is also fixed with a support plate 903 by a bracket.

[0027] In this embodiment of the invention, the weight of the second air supply pipe 901 and the third air supply pipe 902 is applied to the support plate 903 through the bracket. The support plate 903 is on the surface of the medicine. The support plate 903 has a perforated plate structure so that when the support plate 903 is on the medicine, it will not be completely sunk into the medicine, but will be in a suspended support state. When the airflow enters the No. 1 air supply pipe 9, the airflow enters the No. 2 air supply pipe 901. Since the No. 2 air supply pipe 901 and the No. 1 air supply pipe 9 are in a clearance fit, the airflow enters the No. 3 air supply pipe 902 through the gap and is ejected through the nozzle 904. This design creates uniform disturbance in the airflow on the surface of the agent, causing the powdered agent to remain loose and suspended. The perforated structure of the support plate 903 ensures support stability while allowing some of the agent to be slightly lifted from the pores, further enhancing the pulverization effect. As the agent is continuously consumed, the support plate 903 slowly sinks on the surface of the agent, thereby achieving dynamic contact between the second air supply pipe 901 and the surface of the agent, ensuring that the disturbance always acts on the current surface of the agent.

[0028] It should also be noted that a second limiting block 906 is fixed to the inner wall of the second air supply pipe 901, and a first limiting block 905 is fixed to the outer wall of the first air supply pipe 9. The first limiting block 905 and the second limiting block 906 are in sliding engagement, thereby enabling the first air supply pipe 9 and the second air supply pipe 901 to slide axially and not rotate. This prevents the second air supply pipe 901 from rotating and causing the bearing plate 903 to rotate, which would disrupt the stable contact with the surface of the medicine and cause the delivery pipe 3 to fall into the medicine.

[0029] The intermittent exhaust mechanism includes a rotating cylinder 702 rotatably installed inside the narrow tube 7. Multiple second exhaust ports 703 are equidistantly opened on the circumference of the rotating cylinder 702. A first exhaust port 701 that cooperates with the second exhaust ports 703 is opened on the narrow tube 7. Multiple spiral force-bearing strips 704 are fixed equidistantly on the inner wall of the rotating cylinder 702. A gap connecting sleeve 705 is fitted onto the narrow tube 7, and the gap connecting sleeve 705 is fixed and connected to the first air supply tube 9.

[0030] In this embodiment of the invention, when the airflow is flowing inside the narrow-mesh pipe 7, the rotating cylinder 702 is driven to rotate by the cooperation with the spiral force bar 704. When the rotating cylinder 702 rotates, the second exhaust port 703 and the first exhaust port 701 intermittently overlap, thereby causing the gas flowing inside the narrow-mesh pipe 7 to be intermittently discharged through the first exhaust port 701 and the second exhaust port 703, forming a pulsed airflow. This pulsed airflow is introduced into the first air supply pipe 9 through the gap connecting sleeve 705, and then passes through the second air supply pipe 901 and the third air supply pipe 902 in sequence, and is finally periodically ejected by the nozzle 904.

[0031] The mixing and emission mechanism includes an L-shaped emission pipe 5, which is fixed and connected to a reducing pipe 4. The end of the emission pipe 5 away from the reducing pipe 4 is inserted into the eccentric part of the mixing box 2. The discharge pipe 5 has multiple air outlets 501 at equal intervals at the end away from the reducer pipe 4; The mixing chamber 2 is equipped with a drug dispensing assembly.

[0032] In this embodiment of the invention, when the airflow flows in the variable diameter pipe 4, it is transported together with the agent to the discharge pipe 5 and finally discharged through the air outlet 501. The mixing tank 2 contains water for mixing with the reagent. The discharge pipe 5 is inserted into the water. When the gas and reagent in the discharge pipe 5 are discharged through the vent 501, a vortex is created in the water. This vortex mixes the reagent with the water. Compared to traditional stirring, this mixing method does not raise the temperature, thus avoiding the reagent generating heat during stirring. Furthermore, the vortex mixing process involves no mechanical shear force, significantly reducing the risk of damage to the reagent's molecular structure.

[0033] In addition, there may be some large, insoluble impurities in the reagent, and the centripetal force during the vortex rotation will cause the impurities to be located in the center of the mixing chamber 2.

[0034] The dispensing assembly includes a dispensing pipe 10 disposed at the eccentric position of the mixing tank 2. The dispensing pipe 10 passes through the mixing tank 2 and is fixed thereto. A siphon pipe 1001 is disposed inside the mixing tank 2. The siphon pipe 1001 is sleeved on the dispensing pipe 10 and fixed to the inner wall of the mixing tank 2.

[0035] In this embodiment of the invention, when the liquid level in the mixing tank 2 is higher than the siphon tube 1001, the siphon principle is used to automatically allow the pharmaceutical solution to flow out through the siphon tube 1001 and the outlet pipe 10. Since the outlet pipe 10 is located off-center in the mixing tank 2, undissolved impurities continuously accumulate at the center of the mixing tank 2 due to the centripetal force of the vortex, preventing them from being siphoned out with the pharmaceutical solution. This achieves automatic separation of impurities, ensuring the purity and stability of the output pharmaceutical solution. This separation mechanism requires no additional power, has a simple and reliable structure, and is suitable for long-term continuous operation.

[0036] The inner wall of the medicine storage box 1 is fixed with a partition 201, and the liquid outlet pipe 10 and the siphon pipe 1001 are located on the inner wall of the partition 201.

[0037] In this embodiment of the invention, the partition 201 can further reduce the possibility of impurities being sucked into the liquid outlet pipe 10 and the siphon pipe 1001.

[0038] Guide wheels 602 are rotatably installed on both the inner and outer walls of the medicine storage box 1. A through hole is opened between the two guide wheels 602 on the medicine storage box 1. A sliding sealing cylinder 603 is installed in the through hole. A pull rope 6 is slidably installed inside the sliding sealing cylinder 603. One end of the pull rope 6 is fixed to the bearing plate 903, and the other end is outside the medicine storage box 1.

[0039] In this embodiment of the invention, the guide wheel 602 is used to limit and guide the pull rope 6; The medicine storage tank 1 is equipped with a dispensing port 101 for adding medicine into the medicine storage tank 1. When adding medicine into the medicine storage tank 1, the pull rope 6 is pulled, and under the limiting guidance of the two guide wheels 602, the support plate 903 is raised vertically to below the dispensing port 101. Then, the medicine is added into the medicine storage tank 1 through the dispensing port 101, so that the medicine added into the medicine storage tank 1 is below the support plate 903. After the medicine is added, the pull rope 6 is released, the support plate 903 is reset under the action of gravity, and then the dispensing port 101 is sealed to complete the addition of medicine.

[0040] The pull rope 6 is fixed with a counterweight ball 601 at the end away from the bearing plate 903, and a U-shaped piece 604 that cooperates with the counterweight ball 601 is fixed on the outer wall of the medicine storage box 1.

[0041] In this embodiment of the invention, when the pull rope 6 is pulled, the counterweight ball 601 moves accordingly, such as... Figure 12 As shown, when the counterweight ball 601 moves to the bottom of the U-shaped part 604, the counterweight ball 601 is locked into the groove at the bottom of the U-shaped part 604, thus temporarily locking the pull rope 6.

[0042] The dust collection component 11 is horn-shaped, with its smaller diameter end connected to the reducer 4 via a solenoid valve 401, and its larger diameter end located inside the medicine storage tank 1.

[0043] The present invention also provides a method for adding chemicals at the wellhead of an oil and gas well, using the aforementioned chemical addition device, comprising the following steps: Step 1: Pull the rope 6 to lift the carrier plate 903, add powdered medicine through the inlet 101 of the medicine storage box 1, loosen the rope to reset the carrier plate 903 and seal the inlet 101, and complete the pre-filling of medicine; Step 2: Start the air pump. The airflow drives the intermittent exhaust mechanism through the narrow pipe 7 to form a pulse airflow that flows through the first air supply pipe 9 and the second air supply pipe 901 to fluidize the medicine in the medicine storage tank 1. The variable diameter pipe 4 uses the negative pressure effect and works with the solenoid valve 401 to regulate the flow rate and draw in the powdery medicine to mix with the airflow. Step 3: The mixed gas is introduced into the mixing box 2 to form a vortex for mixing. After the liquid level of the mixed liquid reaches the standard, it is automatically siphoned out through the siphon pipe 1001 and the liquid outlet pipe 10.

[0044] During use (operation), the oil and gas wellhead chemical dosing device is deployed on a loading vehicle. Both the storage tank 1 and the mixing tank 2 are fixed to the loading vehicle by brackets. The device uses an air pump as its core power source. When the air pump is running, it continuously pumps high-pressure airflow into the input pipe 8. The airflow first enters the narrow pipe 7, which is wide at both ends and narrow in the middle of the Venturi structure. The spiral force bar 704 inside the narrow pipe 7 is driven by the impact of the high-speed airflow to make the rotating cylinder 702 rotate continuously. The second exhaust port 703 on the rotating cylinder 702 intermittently overlaps and connects with the first exhaust port 701 on the outer wall of the narrow pipe 7 as it rotates, thereby generating a regular pulse airflow. This pulse airflow is introduced into the first gas supply pipe 9 through the gap connecting sleeve 705, and then through the inclined second gas supply pipe 9 which is sealed with the gap between the first gas supply pipe 9 and the first gas supply pipe 9. Pipe 901 directs the flow to multiple sets of circumferentially distributed No. 3 air supply pipes 902, ultimately ejecting the powdered medicine from the nozzle 904 of the No. 3 air supply pipe 902 in a pulsed manner. The No. 2 air supply pipe 901 is connected to a perforated plate-shaped support plate 903 via a bracket. The support plate 903 is suspended and supports the surface of the powdered medicine in the medicine storage tank 1, preventing it from sinking deep into the medicine while slowly sinking as the medicine is consumed. This maintains dynamic contact between the air supply nozzle 904 and the medicine surface. Combined with the axial sliding limit design of the No. 1 limiting block 905 on the outer wall of the No. 1 air supply pipe 901 and the No. 2 limiting block 906 on the inner wall of the No. 2 air supply pipe 901, rotation of the No. 2 air supply pipe 901 prevents it from disrupting the contact state of the medicine surface. The pulsed airflow continuously and uniformly disturbs the medicine surface, causing the powdered medicine to completely loosen and form... The airflow remains stable with floating dust. Simultaneously, the main airflow passes through the narrow-middle pipe 7 and then enters the tapered reducer pipe 4 (larger at one end and smaller at the other) via the U-shaped conveying pipe 3. The airflow accelerates within the reducer pipe 4, creating a Bernoulli negative pressure effect. This negative pressure is transmitted to the medicine storage tank 1 via the trumpet-shaped dust collector 11 and the matching solenoid valve 401. The solenoid valve 401 precisely controls the airflow and drug flow rate under negative pressure, thereby precisely controlling the drug delivery rate and mixing concentration. The floating dust-like drug in the medicine storage tank 1 is drawn into the reducer pipe 4 along with the airflow, achieving a highly dispersed pre-mixing with the main airflow. The mixed gas-drug two-phase flow is then conveyed to the mixing tank 2 via the L-shaped discharge pipe 5. The discharge pipe 5 is eccentrically inserted into the water within the mixing tank 2. The gas-drug mixture exits from multiple outlets at the end of the discharge pipe 5. The vent 501 sprays out, causing the water in the tank to form a stable vortex. Relying on the turbulent flow of the vortex, the agent and water are mixed gently without heating or mechanical shearing, which avoids the agent from clumping and settling, and also prevents the agent molecular structure from being damaged by mechanical stirring. At the same time, the centripetal force generated by the vortex will centrifugally gather large insoluble impurities in the agent to the center of the mixing tank 2. The eccentrically set siphon tube 1001 in the mixing tank 2 works with the liquid outlet tube 10 to realize the automatic flow of the agent mixture using the siphon principle. Since the impurities are always gathered in the center of the tank, they cannot be sucked in by the eccentrically set siphon tube 1001. In addition, the partition 201 on the inside of the storage tank 1 further blocks the impurities, realizing the automatic separation of impurities from qualified agent solutions, ensuring the purity and stability of the output agent solution.In addition, the medicine storage tank 1 is equipped with a guide wheel 602, a pull rope 6, a counterweight ball 601, and a U-shaped component 604 to form a feeding mechanism. The medicine storage tank 1 has a medicine inlet 101. The guide wheel 602, which is rotatably mounted inside and outside the tank, works with the sliding sealing cylinder 603 to limit and guide the pull rope 6. When medicine needs to be added, pulling the pull rope 6 raises the support plate 903 to below the inlet 101. After adding medicine, releasing the pull rope 6 causes the support plate 903 to return to its original position by gravity. The counterweight ball 601 at the end of the pull rope 6 engages with the U-shaped component 604 to temporarily lock the pull rope 6. This completes the entire process of pulse-type pulverization, negative pressure suction, vortex mixing, impurity separation, and continuous precise dosing of powdered medicine, suitable for the long-term continuous dosing needs of oil and gas wellheads.

[0045] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0046] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A chemical dosing device for oil and gas wellheads, comprising a chemical storage tank (1) and a mixing tank (2), both the chemical storage tank (1) and the mixing tank (2) being mounted on a loading vehicle via brackets, characterized in that, Also includes: A U-shaped conveying pipe (3) is fixed to the outer wall of the medicine storage box (1). A narrow pipe (7) is fixed to the input end of the conveying pipe (3). An input pipe (8) is fixed to the end of the narrow pipe (7) away from the conveying pipe (3). A reducing pipe (4) is fixed to the output end of the conveying pipe (3). The reducing pipe (4) is connected to the mixing and discharging mechanism installed in the mixing box (2). A solenoid valve (401) is fixed to the bottom of the reducing pipe (4). The solenoid valve (401) is fixed and connected to the dust collection component (11) fixed in the medicine storage box (1). The No. 1 gas supply pipe (9) passes through the bottom of the medicine storage box (1) and is fixed thereto. The No. 1 gas supply pipe (9) is connected to the narrow pipe (7) through the intermittent exhaust mechanism. The gas transported in the narrow pipe (7) is intermittently supplied to the No. 1 gas supply pipe (9) through the intermittent exhaust mechanism.

2. The oil and gas wellhead chemical dosing device according to claim 1, characterized in that, The No. 1 air supply pipe (9) is fitted with a No. 2 air supply pipe (901) in a sealing sliding sleeve. The No. 2 air supply pipe (901) and the No. 1 air supply pipe (9) are fitted with a clearance. Multiple No. 3 air supply pipes (902) are fixed circumferentially on the No. 2 air supply pipe (901). Multiple nozzles (904) connected to the No. 3 air supply pipe (902) are fixed circumferentially on the No. 3 air supply pipe (902). The No. 2 air supply pipe (901) is installed at an angle. The No. 2 gas supply pipe (901) is also fixed with a support plate (903) by a bracket.

3. The oil and gas wellhead chemical dosing device according to claim 2, characterized in that, The intermittent exhaust mechanism includes a rotating cylinder (702) rotatably installed inside the narrow tube (7). Multiple second exhaust ports (703) are equidistantly opened on the circumference of the rotating cylinder (702). A first exhaust port (701) that cooperates with the second exhaust ports (703) is opened on the narrow tube (7). Multiple spiral force-bearing strips (704) are equidistantly fixed on the inner wall of the rotating cylinder (702). A gap connecting sleeve (705) is fitted on the narrow tube (7), and the gap connecting sleeve (705) is fixed and connected to the No. 1 air supply pipe (9).

4. The oil and gas wellhead chemical dosing device according to claim 2, characterized in that, The mixing and emission mechanism includes an L-shaped emission pipe (5), which is fixed and connected to a reducing pipe (4). The end of the emission pipe (5) away from the reducing pipe (4) is inserted into the eccentric part of the mixing box (2). The discharge pipe (5) has multiple air outlets (501) at equal intervals at one end away from the reducer (4); The mixing chamber (2) is equipped with a drug dispensing assembly.

5. The oil and gas wellhead chemical dosing device according to claim 4, characterized in that, The dispensing assembly includes a dispensing pipe (10) located at the eccentric position of the mixing tank (2). The dispensing pipe (10) passes through the mixing tank (2) and is fixed thereto. A siphon pipe (1001) is provided inside the mixing tank (2). The siphon pipe (1001) is sleeved on the dispensing pipe (10) and fixed to the inner wall of the mixing tank (2).

6. The oil and gas wellhead chemical dosing device according to claim 5, characterized in that, The medicine storage box (1) has a partition (201) fixed on its inner wall, and the liquid outlet pipe (10) and siphon pipe (1001) are located on the inner wall of the partition (201).

7. The oil and gas wellhead chemical dosing device according to claim 2, characterized in that, The medicine storage box (1) is rotatably equipped with guide wheels (602) on both the inner and outer walls. A through hole is provided between the two guide wheels (602) on the medicine storage box (1). A sliding sealing cylinder (603) is installed in the through hole. A pull rope (6) is slidably installed inside the sliding sealing cylinder (603). One end of the pull rope (6) is fixed to the bearing plate (903), and the other end is outside the medicine storage box (1).

8. The oil and gas wellhead chemical dosing device according to claim 7, characterized in that, The pull rope (6) is fixed with a counterweight ball (601) at the end away from the bearing plate (903), and the medicine storage box (1) is fixed with a U-shaped piece (604) that cooperates with the counterweight ball (601) on the outer wall.

9. The oil and gas wellhead chemical dosing device according to claim 1, characterized in that, The dust collection component (11) is horn-shaped, with its smaller diameter end connected to the reducer (4) via a solenoid valve (401), and its larger diameter end located inside the medicine storage tank (1).

10. A method for adding chemicals at the oil and gas wellhead, using the oil and gas wellhead chemical addition device as described in any one of claims 1-9, characterized in that, Includes the following steps: Step 1: Pull the rope (6) to lift the carrier plate (903), add powdered medicine through the inlet (101) of the medicine storage box (1), loosen the rope to reset the carrier plate (903) and seal the inlet (101) to complete the pre-filling of medicine; Step 2: Start the air pump. The airflow drives the intermittent exhaust mechanism through the narrow pipe (7) to form a pulse airflow that fluidizes the medicine in the medicine storage tank (1) through the No. 1 air supply pipe (9) and the No. 2 air supply pipe (901). The variable diameter pipe (4) uses the negative pressure effect and the solenoid valve (401) to regulate the flow rate and draw in the powdery medicine to mix with the airflow. Step 3: The mixed gas is introduced into the mixing box (2) to form a vortex for mixing. After the liquid level of the mixed liquid reaches the standard, it is automatically siphoned out through the siphon pipe (1001) and the liquid outlet pipe (10).

Images