A polymer powder compounding test device

Abstract

The utility model discloses a kind of polymer powder mixing test device, including the communication of clean water tank, mixer module, liquid storage tank and mixing tank in turn, one side of multiple mixers is communicated to clean water tank, the other side is communicated to liquid storage tank, the liquid storage tank is communicated to mixing tank, the clean water tank is also communicated to mixing tank;It further includes screw conveyor, which selectively transports polymer powder into one of the mixers;Valve is provided on the inlet end and outlet end of multiple mixers, and multiple mixers are connected by water pipe line and provided with valve;Multiple mixers include multiple venturi mixers, shear pump and dispersion grinding pump;It further includes control system, which selectively controls the opening and closing of each valve to realize the individual communication of multiple mixers or the parallel communication between two of them.The utility model realizes the mixing effect of different mixer single use or combination, and optimizes the mixer with large mixing concentration, large displacement and uniform mixing.

Description

Technical Field

[0001] This utility model relates to the field of polymer fracturing fluid mixing technology. More specifically, this utility model relates to a polymer powder mixing test device. Background Technology

[0002] Currently, the mainstream fracturing fluid system in China is the "slippery water" system, which is made by mixing powder, white oil, and suspending agent into a concentrated solution and then diluting it according to a certain ratio. The main disadvantages of this fluid system are the high cost of white oil and suspending agent, which can damage the formation; the long swelling time; and the need for a large number of transition fluid tanks (approximately 30 tanks × 50m). 3 It occupies a large area (approximately 300m²). 2 Construction costs remain high.

[0003] With the emergence of readily soluble polymer powders, the method of preparing a concentrated solution from powder and water, followed by secondary dilution, allows for immediate use and adjustable viscosity, reducing construction costs and minimizing formation damage—a new development trend in fracturing fluid systems. Currently, some polymer powder manufacturers are testing mixing devices, the core component of which is the mixer, including Venturi mixers, shear pumps, and dispersion / grinding pumps. However, due to the lack of suitable testing platforms and methods for such products, problems such as low mixing concentration, low flow rate, and uneven mixing occur when the equipment is used directly in the field. Therefore, there is an urgent need to develop a polymer powder mixing testing device. Utility Model Content

[0004] One objective of this invention is to provide a polymer powder mixing test device to test the mixing effect of different mixers used alone or in combination, and to select a mixer with high mixing concentration, large displacement, and uniform mixing.

[0005] To address the aforementioned technical problems, this utility model provides a polymer powder mixing test device, comprising a clean water tank, a mixer module, a storage tank, and a mixing tank connected sequentially by water pipelines. The mixer module includes multiple mixers arranged in parallel, with one side of each mixer connected to the clean water tank and the other side connected to the storage tank. The storage tank is connected to the mixing tank, and the clean water tank is also connected to the mixing tank. The device also includes a screw conveyor that selectively delivers polymer powder to one of the mixers via polymer powder pipelines. Valves are correspondingly installed on the water pipelines at the inlet and outlet ends of the multiple mixers, and the multiple mixers are interconnected via water pipelines and valves are also installed. The multiple mixers include multiple Venturi mixers, a shear pump, and a dispersion and grinding pump. The device also includes a control system for selectively controlling the opening and closing of each valve to achieve individual connection of the multiple mixers or parallel connection between two of the mixers.

[0006] Preferably, there are five mixers: three Venturi mixers, a shear pump, and a dispersion and grinding pump. Venturi mixer No. 1 and Venturi mixer No. 2 are connected by a water pipeline and equipped with a valve. Venturi mixer No. 3 is connected to the shear pump and the dispersion and grinding pump by a water pipeline and is equipped with a valve. The screw conveyor is connected to Venturi mixer No. 1, Venturi mixer No. 3, shear pump, and dispersion and grinding pump by a polymer powder pipeline.

[0007] Preferably, the mixing tank is equipped with a stirrer, and the water pipeline between the storage tank and the mixing tank is equipped with a valve and a rotor pump. The rotor pump is used to transport the mixture in the storage tank to the mixing tank, and the control system is also used to control the operation of the rotor pump.

[0008] Preferably, valves and centrifugal pumps are installed on the water pipelines between the clean water tank and the mixer module, as well as between the clean water tank and the mixing tank. The centrifugal pump is used to supply water to the mixer module and the mixing tank, and the head of the centrifugal pump is ≥0.4MPa. The control system is also used to control the operation of the centrifugal pump.

[0009] Preferably, the system also includes multiple flow sensors, which are respectively installed on the water pipeline between the clean water tank and the mixer module, between the clean water tank and the mixing tank, between the storage tank and the mixing tank, and between the No. 2 Venturi mixer and its inlet valve. The flow sensors are used to detect the inflow of water, and the control system is also used to detect the flow sensors and acquire data.

[0010] Preferably, a pressure sensor is also provided between the water tank and the mixer module to detect the water pipeline pressure, and the control system is also used to detect the pressure sensor and acquire data.

[0011] Preferably, the system also includes a viscosity sensor, which is installed in both the storage tank and the mixing tank. The viscosity sensor is used to detect the viscosity value of the mixture, and the control system is also used to detect the viscosity sensor and acquire data.

[0012] Preferably, the screw conveyor is also equipped with a speed sensor and a weight sensor. The speed sensor is used to detect the speed of the screw conveyor, and the weight sensor is used to detect the amount of powder conveyed by the screw conveyor. The shear pump and the dispersing and grinding pump are also equipped with speed sensors, which are used to detect the speed of the shear pump and the dispersing and grinding pump. The control system is also used to detect the speed sensor and the weight sensor and acquire data.

[0013] This utility model has at least the following beneficial effects: 1. This utility model provides a test device that can test polymer powder in advance, enabling the testing of the mixing effect of different mixers used alone or in combination, and selecting the mixer with high mixing concentration, large discharge capacity and uniform mixing, thus avoiding various problems that may occur when polymer powder is mixed and diluted directly on-site.

[0014] 2. The experimental device of this utility model can conduct mixing tests in advance, which greatly avoids various problems caused by direct on-site mixing. It has the advantages of accurate testing, high efficiency, and a wide variety of test types.

[0015] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0016] Figure 1 This is a flow chart of the polymer powder mixing test device and test method of this utility model.

[0017] Explanation of reference numerals in the attached diagram: 1. Clean water tank; 2. Valve; 3. Water pipeline; 4. Centrifugal pump; 5. Flow sensor; 6. Venturi mixer; 7. Screw conveyor; 8. Weight sensor; 9. Speed ​​sensor; 10. Polymer powder pipeline; 11. Pressure sensor; 12. Shear pump; 13. Dispersion and grinding pump; 14. Viscosity sensor; 15. Storage tank; 16. Rotary pump; 17. Mixing tank; 18. Agitator. Detailed Implementation

[0018] To better understand the purpose, structure, and function of this utility model, the following detailed description is provided in conjunction with the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0019] It should be noted that in the description of this utility model, the terms "horizontal", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0020] like Figure 1As shown, this utility model provides a polymer powder mixing test device, comprising a water tank 1, pipelines (including water pipeline 3 and polymer powder pipeline 10), a centrifugal pump 4, a flow sensor 5, a valve 2 (which may be a butterfly valve), a venturi mixer 6, a screw conveyor 7, a shear pump 12, a dispersion and grinding pump 13, a storage tank 15, a rotor pump 16, a mixing tank 17, a stirrer 18, a pressure sensor 11, a speed sensor 9, a weight sensor 8, a viscosity sensor 14, and a control system.

[0021] The water tank 1 has two outlet valves 2, namely valve #1 and valve #2, which are connected to two centrifugal pumps 4 via water pipelines 3. Both centrifugal pumps #1 and #2 have flow sensors 5. A pressure sensor 11 is also installed after centrifugal pump #1. There are 5 valves at the outlet of flow sensor #1, which are connected to venturi mixer #1, venturi mixer #2, venturi mixer #3, shear pump, and dispersion grinding pump, respectively.

[0022] Screw conveyors can transport polymer powder through a system such as... Figure 1 The blue polymer powder pipeline 10 shown conveys the polymer powder to the No. 1 Venturi mixer, the No. 3 Venturi mixer, the shear pump, and the dispersion and grinding pump. The screw conveyor has a speed sensor and a weight sensor, which can accurately measure the weight of the conveyed polymer powder.

[0023] After the water and powder are mixed, they are introduced into the storage tank 15 through the valve. The storage tank has a viscosity sensor that can measure the viscosity data of the mixture and observe the form of the mixture in the mixing tank.

[0024] The outlet of the storage tank is connected to a rotary pump 16, and a flow sensor #4 is connected after the rotary pump. The mixture enters the mixing tank 17. Clean water is introduced into the mixing tank via a centrifugal pump #2 and a flow sensor #2. The mixture is diluted by stirring with a stirrer 18. The mixing tank contains a viscosity sensor #2 to measure the viscosity of the diluted solution.

[0025] The control system can test mixing data at different concentrations by controlling and setting different water flow rates and polymer powder conveying weights. By collecting viscosity data and observing the mixing morphology, the mixing effect is determined, and the optimal mixer combination is obtained. The concentration is the ratio of the material weight detected by the weight sensor corresponding to the screw conveyor to the water volume detected by the No. 1 flow sensor.

[0026] The water tank, centrifugal pump, butterfly valve, venturi mixer, screw conveyor, shear pump, dispersion and grinding pump, storage tank, rotor pump, and mixing tank of this application are connected by pipelines; all mixers are supplied with water by the same centrifugal pump; there are two types of venturi mixers, distinguished by their displacement, with the displacement of the No. 2 venturi mixer being greater than that of the No. 1 venturi mixer; different test procedures can be selected by opening and closing different valves, allowing for individual testing of the venturi mixer, shear pump, and dispersion and grinding pump, as well as testing of two venturi mixers, a venturi mixer and a shear pump, or a venturi mixer and a dispersion and grinding pump used in combination; to ensure the mixing effect of the venturi mixer, the head of the centrifugal pump must be ≥0.4MPa; After the polymer powder is mixed with water, it is transported to a storage tank. The morphology of the mixture is observed in the storage tank (whether the powder is completely dissolved in the water, whether undissolved particles can be observed, and whether the morphology meets the requirements). The viscosity is measured (based on the viscosity requirements corresponding to different product concentrations). The mixing effect is comprehensively judged by the morphology and viscosity, thus selecting a suitable mixing test. A rotary pump then transports the high-viscosity material from the storage tank to a mixing tank for secondary dilution with water. The mixing tank is equipped with a stirrer to ensure effective dilution. The viscosity after dilution is approximately 20-75 mPa·s, which meets the requirements. The specific viscosity range is set according to the actual product and concentration.

[0027] The control system is connected to flow sensors, speed sensors, weight sensors, pressure sensors, and viscosity sensors. The flow sensors measure the inlet water flow rate; the speed sensors measure the speed of the screw conveyor, shear pump, and dispersion / grinding pump; the weight sensors measure the amount of powder conveyed by the screw conveyor; the pressure sensors measure the pipeline pressure; and the viscosity sensors measure the viscosity of the mixture. The control system includes a control program that allows setting the centrifugal pump displacement, the amount of powder conveyed by the screw conveyor, and the speeds of the shear pump and dispersion / grinding pump during testing, recording real-time and cumulative parameters. The control system can control the opening and closing of various valves to conduct different tests; simultaneously, before the test, it acquires the amount of powder conveyed and the water flow rate, calculates the concentration, and acquires the pressure sensor values ​​to determine if the normal operating requirements of the Venturi mixer are met; during the test, it acquires the real-time viscosity sensor values ​​of the storage tank and mixing tank, and combines this with observations of the mixture's morphology to ultimately select a suitable mixing test that meets the requirements.

[0028] The present invention provides a test method for mixing polymer powders using a polymer powder mixing test device, which includes the following tests.

[0029] (1) Single Venturi mixer test Set the centrifugal pump displacement and the polymer powder conveying capacity of the screw conveyor, open the corresponding valve of a single Venturi mixer, conduct tests at different concentrations, and verify the mixing effect by obtaining viscosity values ​​and observing the morphology of the mixture.

[0030] For example, by setting the displacement of centrifugal pump #1 and the polymer powder conveying capacity of screw conveyor, opening valves #1, #3, and #11, and conducting a test on venturi mixer #1, different concentration tests can be performed. Mixing data can be obtained by detecting the form and viscosity of the mixture in the storage tank.

[0031] Set the displacement of centrifugal pump #1 and the polymer powder conveying capacity of screw conveyor. Open valves #1, #5, and #13 to conduct a test on venturi mixer #3. Different concentration tests can be performed. Mixing data can be obtained by detecting the form and viscosity of the mixture in the storage tank.

[0032] (2) Joint test of two-stage Venturi mixer Set the centrifugal pump displacement and the polymer powder conveying capacity of the screw conveyor. Open the corresponding valves of two Venturi mixers. After starting the test, clean water and polymer powder are premixed in the first-stage Venturi mixer. The output mixture enters the powder inlet of the second-stage Venturi mixer for secondary mixing with clean water. The mixing effect is verified by detecting the form and viscosity of the mixture in the storage tank.

[0033] For example: Set the displacement of centrifugal pump #1 and the polymer powder conveying capacity of screw conveyor. Open valves #1, #3, #4, #8, and #12. Before starting the test, adjust the opening of valves #3 and #4 to ensure that the value of flow sensor #1 is greater than that of flow sensor #3. Premix clean water and polymer powder in the first-stage Venturi mixer. The output mixture enters the powder inlet of the second-stage Venturi mixer for secondary mixing with clean water. Different concentration tests can be conducted. Mixing data can be obtained by detecting the form and viscosity of the mixture in the tank.

[0034] (3) Shear pump mixing test Set the centrifugal pump displacement and the polymer powder conveying capacity of the screw conveyor, open the corresponding valve of the shear pump, and conduct an experiment. Verify the mixing effect by detecting the form and viscosity of the mixture in the liquid tank.

[0035] For example, set the displacement of centrifugal pump #1 and the polymer powder conveying capacity of screw conveyor, open valves #1, #6 and #14 to conduct mixing tests. Different concentration tests can be conducted, and mixing data can be obtained by detecting the form and viscosity of the mixture in the tank.

[0036] (4) Dispersion grinding pump mixing test Set the centrifugal pump displacement and the polymer powder conveying capacity of the screw conveyor, open the corresponding valve of the dispersion and grinding pump, and conduct an experiment. Verify the mixing effect by detecting the form and viscosity of the mixture in the tank.

[0037] For example, by setting the displacement of centrifugal pump #1, the polymer powder conveying capacity of screw conveyor, valve #1, valve #7, and valve #15, a mixing test can be conducted. Different concentration tests can be performed, and mixing data can be obtained by detecting the form and viscosity of the mixture in the liquid tank.

[0038] (5) Combined test of Venturi mixer and shear pump Set the centrifugal pump displacement and the polymer powder conveying capacity of the screw conveyor. Open the valves corresponding to one of the Venturi mixers and the shear pump. After starting the test, clean water and polymer powder are premixed in the Venturi mixer. The output mixture enters the inlet of the shear pump for secondary shear mixing. The mixing effect is verified by detecting the form and viscosity of the mixture in the tank.

[0039] For example: Set the displacement of centrifugal pump #1 and the polymer powder conveying capacity of screw conveyor. Open valves #1, #5, #9, and #14. After starting the test, clean water and polymer powder are premixed in a venturi mixer. The output mixture enters the inlet of the shear pump for secondary shear mixing. Different concentration tests can be conducted. Mixing data can be obtained by detecting the form and viscosity of the mixture in the tank.

[0040] (6) Combined test of Venturi mixer and dispersion grinding pump Set the centrifugal pump displacement and the polymer powder conveying capacity of the screw conveyor. Open the valves corresponding to one of the Venturi mixers and the dispersion grinding pump. After starting the test, clean water and polymer powder are premixed in the Venturi mixer. The output mixture enters the inlet of the shear pump for secondary grinding and mixing. The mixing effect is verified by detecting the form and viscosity of the mixture in the tank.

[0041] For example: Set the displacement of centrifugal pump #1 and the polymer powder conveying capacity of screw conveyor. Open valves #1, #5, #10, and #15. After starting the test, clean water and polymer powder are premixed in a venturi mixer. The output mixture enters the inlet of a shear pump for secondary grinding and mixing. The mixing effect is verified by detecting the form and viscosity of the mixture in the tank.

[0042] (7) Mixture dilution test Open the valves corresponding to the storage tank, mixing tank, and clean water tank. The mixture in the storage tank is introduced into the mixing tank through a rotor pump, and the clean water is introduced into the mixing tank through a centrifugal pump. After being stirred and mixed by a stirrer, record the dilution time (the time it takes for the mixture to dilute to the required level from the storage tank to the mixing tank) and the liquid viscosity value to verify the dilution effect.

[0043] For example: Open valve 16, and the mixture in storage tank 15 is introduced into mixing tank 17 through rotor pump 16. Open valve 2, and clean water is introduced into mixing tank through centrifugal pump 2. Mixtures of different proportions and clean water are stirred and mixed by stirrer 18. The dilution time and liquid viscosity values ​​are recorded to verify the dilution effect.

[0044] It is understood that this utility model has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model, and other modifications can be easily made by those skilled in the art. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and examples shown and described herein.

Claims

1. A polymer powder mixing test apparatus, characterized in that, The system includes a clean water tank, a mixer module, a storage tank, and a mixing tank, which are connected sequentially by water pipelines. The mixer module includes multiple mixers arranged in parallel, with one side of each mixer connected to the clean water tank and the other side connected to the storage tank. The storage tank is connected to the mixing tank, and the clean water tank is also connected to the mixing tank. The system also includes a screw conveyor that selectively delivers polymer powder to one of the mixers via a polymer powder pipeline. Valves are correspondingly installed on the water pipelines at the inlet and outlet ends of the multiple mixers, and the multiple mixers are interconnected via water pipelines and valves. The multiple mixers include multiple Venturi mixers, a shear pump, and a dispersion and grinding pump. The system also includes a control system for selectively controlling the opening and closing of each valve to achieve individual connection of the multiple mixers or parallel connection between two of the mixers.

2. The polymer powder mixing test apparatus as described in claim 1, characterized in that, The mixers are configured as five in total: three Venturi mixers, a shear pump, and a dispersion and grinding pump. Venturi mixer No. 1 and Venturi mixer No. 2 are connected by a water pipeline and equipped with a valve. Venturi mixer No. 3 is connected to the shear pump and the dispersion and grinding pump by a water pipeline and is also equipped with a valve. The screw conveyor is connected to Venturi mixer No. 1, Venturi mixer No. 3, the shear pump, and the dispersion and grinding pump by a polymer powder pipeline.

3. The polymer powder mixing test apparatus as described in claim 1, characterized in that, The mixing tank is equipped with a stirrer, and the water pipeline between the storage tank and the mixing tank is equipped with a valve and a rotor pump. The rotor pump is used to transport the mixture in the storage tank to the mixing tank, and the control system is also used to control the operation of the rotor pump.

4. The polymer powder mixing test apparatus as described in claim 1, characterized in that, Valves and centrifugal pumps are installed on the water pipelines between the clean water tank and the mixer module, as well as between the clean water tank and the mixing tank. The centrifugal pump is used to supply water to the mixer module and the mixing tank. The head of the centrifugal pump is ≥0.4MPa. The control system is also used to control the operation of the centrifugal pump.

5. The polymer powder mixing test apparatus as described in claim 2, characterized in that, It also includes multiple flow sensors, which are respectively installed on the water pipeline between the clean water tank and the mixer module, between the clean water tank and the mixing tank, between the storage tank and the mixing tank, and between the No. 2 Venturi mixer and its inlet valve. The flow sensors are used to detect the inflow of water, and the control system is also used to detect the flow sensors and acquire data.

6. The polymer powder mixing test apparatus as described in claim 1, characterized in that, A pressure sensor is also installed between the water tank and the mixer module to detect the water pipeline pressure. The control system is also used to detect the pressure sensor and acquire data.

7. The polymer powder mixing test apparatus as described in claim 1, characterized in that, It also includes a viscosity sensor, which is installed in both the storage tank and the mixing tank. The viscosity sensor is used to detect the viscosity value of the mixture. The control system is also used to detect the viscosity sensor and acquire data.

8. The polymer powder mixing test apparatus as described in claim 1, characterized in that, The screw conveyor is also equipped with a speed sensor and a weight sensor. The speed sensor is used to detect the speed of the screw conveyor, and the weight sensor is used to detect the amount of powder conveyed by the screw conveyor. The shear pump and the dispersion and grinding pump are also equipped with speed sensors, which are used to detect the speed of the shear pump and the dispersion and grinding pump. The control system is also used to detect the speed sensor and the weight sensor and acquire data.

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