A spiral flow pulse polymer dispersion device

Abstract

The invention relates to a spiral flow pulse polymer dispersion device, which comprises a dry powder hopper, a pneumatic conveying system, a dissolving tank, a spiral umbrella flow water jet device and a PLC control system. The pneumatic conveying system comprises a Venturi tube and a blower. The dry powder hopper is connected with the Venturi tube. The outlet of the Venturi tube is connected with a mixing chamber on the top of the dissolving tank. The spiral umbrella flow water jet device is arranged on the top of the dissolving tank. The spiral umbrella flow water jet device has a main pipe. The upper end of the main pipe is connected with a water pump. The lower end of the main pipe is welded with six spiral jet pipes. The outlets of the six spiral jet pipes are nozzles. Each nozzle is located in the mixing chamber on the top of the dissolving tank. The negative pressure generated by the six spiral jet pipes which are uniformly distributed in all directions can wet and disperse the polymer dry powder sprayed by the conveying pipe. The mixed material is stirred in the dissolving tank to form a mother liquor. The invention can obtain a solution with high concentration and large configuration amount, and has obvious effect on improving the oil recovery rate.

Description

Technical Field

[0001] This invention relates to a polymer solution preparation device used in the field of petroleum development, specifically a spiral flow pulse polymer dispersion device. Background Technology

[0002] As my country's crude oil industry has gradually entered the middle and late stages of development, some old oil fields have also entered the final stage of development, with increasingly higher water content and limited extraction, making further development extremely difficult; the development of complex oil fields is also extremely challenging.

[0003] Most existing oil reservoirs have entered the late stage of development with high water cut, and water injection flooding can no longer achieve the ideal oil recovery effect. Polymer flooding has gradually become an important technical means in the oil recovery process. From a macroscopic perspective, the principle of polymer flooding is to increase the viscosity of the polymer solution injected underground, reduce the mobility ratio of the polymer solution injected underground to the crude oil, and increase the swept volume. From a microscopic perspective, this viscosity of polymers improves the carrying effect of polymer solution on crude oil droplets. Summary of the Invention

[0004] The purpose of this invention is to provide a spiral flow pulsed polymer dispersion device, which solves the problems of polymer powder agglomeration and poor powder-liquid mixing in existing polymer solution preparation devices.

[0005] The technical solution adopted by this invention to solve its technical problem is as follows: This spiral pulse polymer dispersion device includes a dry powder hopper, a pneumatic conveying system, a dissolving tank, a spiral umbrella-shaped water jet ejector, and a PLC control system. The pneumatic conveying system includes a Venturi tube, a blower, and an air supply pipe. The dry powder hopper is connected to the Venturi tube, the blower is connected to the inlet of the Venturi tube, a pulse valve is installed at the inlet of the Venturi tube, and the outlet of the Venturi tube is connected to the mixing chamber at the top of the dissolving tank through a conveying pipe. The spiral umbrella-shaped water jet ejector is installed at the top of the dissolving tank and has a single... The main pipe is connected to a water pump at its upper end, and six spiral jet pipes are welded to its lower end. The outlets of the six spiral jet pipes are nozzles, each located in the mixing chamber at the top of the dissolving tank. The negative pressure generated by the umbrella-shaped spiral jets evenly distributed in all directions from the six spiral jet pipes wets and disperses the polymer dry powder injected into the dissolving tank through the conveying pipe in the mixing chamber at the top of the dissolving tank. The umbrella-shaped spiral jets evenly mix the polymer dry powder, causing the water and powder to fuse. The mixing chamber is connected to the dissolving tank, and the mixed material is transported to the dissolving tank, where it is stirred to form a mother liquor.

[0006] In the above scheme, the gas blown in from the blower generates a positive swirling pulse velocity at the venturi tube inlet through the pulse valve port, ensuring the uniformity of the airflow carrying the polymer dry powder and preventing the polymer dry powder from clumping during the conveying process after entering the venturi tube.

[0007] In the above scheme, a screw pump is installed in the dissolving tank, which is connected to the maturation tank. The mother liquor is pumped into the maturation tank by the screw pump for maturation. The screw pump starts to run after the liquid in the dissolving tank reaches the control liquid level.

[0008] In the above scheme, a vibrator is installed at the bottom of the dry powder hopper. When the vibrator is working, it generates vibration at a certain frequency, which on the one hand helps the dry powder to move downward along the hopper wall, and on the other hand can separate and disperse the dry powder, avoid the dry powder from clumping and swelling, and promote the conveying of dry powder.

[0009] In the above scheme, a water level meter, an automatic control ball valve, and a flow control valve are installed on the inlet pipeline of the dissolving tank to regulate the water volume and achieve a suitable proportion of mother liquor. A float level gauge is also installed on the dissolving tank to automatically monitor the liquid level in the tank. When the liquid level is too high, the information is automatically transmitted to the flow control valve to control the flow rate and reduce the inlet water volume. When the liquid level is too low, an alarm is automatically triggered and the device is shut off to prevent accidents. Beneficial effects

[0010] 1. In the oil extraction process, the polymer solution prepared using this invention can yield a high-concentration solution in large quantities. During oil displacement, the prepared solution has a significant effect on improving oilfield recovery. This device has the advantages of precise solution preparation, simple process flow, high degree of automation, and low input cost.

[0011] 2. For polymer flooding technology in high water-cut oilfields, this invention can prepare high-viscosity polymer solutions in large quantities, which is of great significance for improving oilfield recovery. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a front view of the pneumatic conveying system in this invention; Figure 3 This is a cross-sectional view of the pneumatic conveying system in this invention; Figure 4 This is a schematic diagram of the six spiral jet tubes in this invention; Figure 5 This is a top view of the six spiral jet tubes in this invention.

[0013] In the diagram: 1-Dry powder hopper, 2-Blower, 3-Pneumatic conveying system, 4-Feeding pipe, 5-Spiral umbrella-shaped water jet injector, 6-Stirring rod, 7-Dissolving tank, 8-Inlet, 9-Pulse valve port, 10-Discharge port, 11-Outlet. Detailed Implementation

[0014] The present invention will be further described below with reference to the accompanying drawings: Combination Figure 1-5 As shown, this spiral pulse polymer dispersion device includes a dry powder hopper 1, a pneumatic conveying system 3, a dissolving tank 7, a spiral umbrella-shaped water jet injector 5, a PLC control system, and a maturation tank. The pneumatic conveying system 3 includes a venturi tube, a blower 2, and an air supply pipe. The dry powder hopper 1 is connected to the venturi tube, and the blower 2 is connected to the venturi tube inlet 8. A pulse valve port 9 is installed at the venturi tube inlet, and the venturi tube outlet 11 is connected to the mixing chamber at the top of the dissolving tank 7 through a conveying pipe 4. The spiral umbrella-shaped water jet injector 5 is installed at the top of the dissolving tank and has a main pipe. A water pump is connected to the upper end of the main pipe to pressurize the jet water flow. Six spiral jet pipes are welded to the lower end of the main pipe. Nozzles are installed at the outlets of the six spiral jet pipes. Each nozzle is located in the mixing chamber at the top of the dissolving tank. The negative pressure generated by the high-speed water flow evenly distributed in all directions sprayed from the six spiral jet pipes wets and disperses the polymer dry powder sprayed into the dissolving tank in the mixing chamber at the top of the dissolving tank. The mixing chamber is connected to the dissolving tank. The mixed material is transported to the dissolving tank 7 and stirred evenly in the dissolving tank 7 to form a uniform, stable mother liquor with a certain concentration. Finally, it is sent to the maturation tank for maturation.

[0015] The main function of the dry powder hopper 1 is to store polymer dry powder. The purpose of installing a vibrator at the bottom of the dry powder hopper 1 is that the vibrator generates vibrations at a certain frequency during operation, which on the one hand helps the dry powder move downwards along the hopper wall, and on the other hand can separate and disperse the dry powder, avoiding the dry powder from clumping and swelling, and promoting the conveying of the dry powder.

[0016] The pneumatic conveying system 3 consists of a blower 2, a venturi tube, and a gas delivery pipe. The system utilizes the airflow generated by the blower to create negative pressure through the venturi tube, drawing the polymer powder into the gas delivery pipe. During this process, the polymer powder is thoroughly dispersed, forming a dispersed system for subsequent preparation of the polymer aqueous solution. This invention incorporates a pulse valve 9 at the venturi tube inlet. This valve generates a positive vortex pulse velocity in the gas blown in by the blower 2 during venturi tube operation, preventing the powder from clumping during transport. This ensures the uniformity of the polymer powder carried by the airflow, facilitating subsequent water-powder fusion and resulting in a more homogeneous polymer mother liquor.

[0017] The spiral umbrella-shaped water jet 5 mixes the polymer dry powder delivered by the pneumatic conveying system through the gas pipeline with the water phase, dissolves and stirs it in the dissolving tank 7 to form a polymer aqueous solution, and then transfers it to the maturation tank for maturation.

[0018] The spiral umbrella-shaped water jet nozzle 5 adopts a spiral jetting form. After using six spiral jetting tubes to spray water, the water flow will be sprayed more evenly, and the polymer dry powder will be more dispersed. In addition, the sprayed water flow will create a vacuum around it, entraining the delivered polymer dry powder into the water flow. When the airflow carrying the polymer dry powder is sprayed from the air supply pipe into the mixing chamber, it will encounter the evenly sprayed high-speed water flow. On the one hand, the high-speed sprayed water flow will create a local vacuum around it, drawing the dry powder into the water; on the other hand, the umbrella-shaped spiral jet flow can make the dry powder evenly mixed in, which also helps the water and powder to blend.

[0019] A water pump is connected to a clean water pipeline, on which a flow meter is installed to monitor the clean water flow rate. The flow meter monitors the clean water flow rate and then transmits the monitoring results to the PLC control system. The PLC control system can be programmed as needed. After data processing, the PLC transmits the data to the control device on the feeder, which adjusts the dry powder feeding speed in conjunction with the water flow rate to achieve a relatively accurate water-powder mixing ratio, thereby meeting the required polymer solution concentration.

[0020] A screw pump is installed in the dissolving tank 7 to transport the liquid inside to the maturation unit for maturation. When the entire spiral flow pulse polymer dispersion device is in automatic operation, the screw pump will start running after the liquid in the dissolving tank 7 reaches the control liquid level, and transport the liquid to the next process.

[0021] A water level meter, an automatic control ball valve, and a flow control valve are installed on the inlet pipe of dissolving tank 7. These automatic control devices function similarly to the flow meter in the clean water pipeline, both aimed at achieving the appropriate proportion of mother liquor and regulating the water flow. An automatic control system is also installed on the dissolving tank to monitor the water level and prevent overflow.

[0022] The float level gauge is also installed on the dissolving tank to monitor the liquid level inside the tank. It automatically monitors the liquid level inside the tank and sends the information to the flow control valve when the liquid level is too high, so as to control the flow rate and implement measures such as reducing the water intake. When the liquid level is too low, it automatically alarms and shuts off the operation of the device to prevent accidents.

[0023] The process flow for preparing the polymer solution according to this invention is as follows: The polymer powder is quantitatively added to the Venturi jet injector, and the local vacuum formed by the high-speed airflow it ejects carries the dry polymer powder into the mixing chamber. During the operation of the Venturi tube, the gas blown in from the blower 2 enters the Venturi tube with a pulse valve port, and a positive swirl pulse velocity is generated at the inlet. This prevents the dry powder from clumping during the conveying process after entering the Venturi tube, which is more conducive to ensuring the uniformity of the polymer powder carried by the airflow. This helps with the subsequent water-powder fusion and makes the prepared polymer mother liquor more uniform.

[0024] The negative pressure generated by the high-speed water jet, evenly distributed in all directions, ejected by the spiral umbrella-shaped water jet nozzle 5, wets and disperses the polymer powder brought in by the pneumatic conveying system. The spiral umbrella-shaped water jet nozzle ensures that the water forms a uniform umbrella-shaped jet when ejected. When the airflow carrying the polymer powder is ejected from the air delivery pipe into the mixing chamber, it will encounter the uniformly ejected high-speed water jet. On the one hand, the high-speed water jet will create a local vacuum around it, drawing the powder into the water; on the other hand, the umbrella-shaped spiral jet can evenly mix the powder, which also helps the water and powder to blend.

[0025] The mixture of the two phases is then transported to dissolving tank 7, where it is stirred to form a homogeneous, stable mother liquor with a certain concentration. Finally, it was sent to a curing tank for curing, which yielded a homogeneous and stable polymer solution.

[0026] The specific process flow for preparing the polymer solution according to this invention is as follows: Polymer powder is quantitatively fed from the dry powder hopper 1 into the discharge port 10 of the pneumatic conveying system 3. Air is blown in from the inlet 8 of the venturi tube by the blower 2. When the airflow passes through the pulse valve port 9, it forms a sinusoidal pulse velocity, providing a horizontal pulse velocity to the incoming dry powder. The local vacuum formed by the high-speed airflow ejected from the outlet 11 of the venturi tube carries the polymer dry powder through the conveying pipe 4 into the spiral umbrella-shaped water jet 5. The negative pressure generated by the high-speed water flow evenly distributed in all directions ejected by the spiral umbrella-shaped water jet 5 carries the polymer dry powder brought by the pneumatic conveying system 3 through the conveying pipe 4 and sprays it into the upper part of the dissolving tank 7 from the side. The polymer dry powder is moistened and dispersed at the inlet of the dissolving tank 7. The two-phase mixture is then transported to the dissolving tank 7. In the dissolving tank, it is stirred evenly by the stirring rod 6 to form a uniform, stable mother liquor with a certain concentration. Finally, it is sent to the maturation tank for maturation.

[0027] The polymer dispersion and dissolution processes can be monitored and operated via a communication interface connected to the PLC control system in the control center. When an error occurs during equipment operation, an alarm will automatically activate, and the alarm information and fault location will be displayed on the PLC screen. Fault information also needs to be saved for statistical analysis of the reliability of the electronic control components used in the equipment and for monitoring product quality. The PLC control software should be rationally programmed, the operating status of the equipment and system should be clearly displayed, and it should be easily adjustable for convenient operation.

Claims

1. A spiral flow pulsed polymer dispersion device, characterized in that: This spiral pulse polymer dispersion device includes a dry powder hopper, a pneumatic conveying system, a dissolving tank, a spiral umbrella-shaped water jet injector, and a PLC control system. The pneumatic conveying system includes a Venturi tube, a blower, and an air supply pipe. The dry powder hopper is connected to the Venturi tube, and the blower is connected to the Venturi tube inlet. A pulse valve is installed at the Venturi tube inlet, and the Venturi tube outlet is connected to the mixing chamber at the top of the dissolving tank via a feed pipe. The spiral umbrella-shaped water jet injector is located at the top of the dissolving tank and has a main pipe with a water supply pipe at its upper end. The pump has six spiral jet pipes welded to the lower end of the main pipe. The outlets of the six spiral jet pipes are nozzles, and each nozzle is located in the mixing chamber at the top of the dissolving tank. The negative pressure generated by the umbrella-shaped spiral jets evenly distributed in all directions from the six spiral jet pipes wets and disperses the polymer dry powder injected into the conveying pipe in the mixing chamber at the top of the dissolving tank. The umbrella-shaped spiral jets make the polymer dry powder evenly mixed in it, so that the water and powder are fused. The mixing chamber is connected to the dissolving tank. The mixed material is transported to the dissolving tank and stirred evenly in the dissolving tank to form a mother liquor. The spiral umbrella-shaped water jet nozzle uses a spiral jet form, so that the water forms a uniform umbrella-shaped jet when it is ejected. When the airflow carrying polymer dry powder is ejected from the air supply pipe into the mixing chamber, it will encounter the uniformly ejected high-speed water flow. On the one hand, the high-speed water flow creates a local vacuum around it, which draws the dry powder into the water; on the other hand, the umbrella-shaped spiral jet flow makes the dry powder uniformly mixed in it, which also helps the water and powder to blend.

2. The spiral flow pulsed polymer dispersion device according to claim 1, characterized in that: The gas blown in by the blower generates a positive swirling pulse velocity at the venturi tube inlet through the pulse valve port, ensuring the uniformity of the airflow carrying the polymer dry powder and preventing the polymer dry powder from clumping during the conveying process after entering the venturi tube.

3. The spiral flow pulsed polymer dispersion device according to claim 2, characterized in that: A screw pump is installed inside the dissolving tank, which is connected to the maturation tank. The mother liquor is pumped into the maturation tank by the screw pump for maturation. Once the liquid level in the dissolving tank reaches the control level, the screw pump starts to run.

4. The spiral flow pulsed polymer dispersion device according to claim 3, characterized in that: A vibrator is installed at the bottom of the dry powder hopper.

5. The spiral flow pulsed polymer dispersion device according to claim 4, characterized in that: The dissolving tank is equipped with a water level meter, an automatic control ball valve, and a flow control valve on its inlet pipeline to regulate the water volume and achieve the appropriate proportion of mother liquor. The dissolving tank is also equipped with a float level gauge to automatically monitor the liquid level inside the tank. When the liquid level is too high, the information is automatically transmitted to the flow control valve to control the flow rate and reduce the inlet water volume. When the liquid level is too low, an alarm is automatically triggered and the device is shut off to prevent accidents.

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