Indoor dynamic simulation test device and method for underground composite alloy scale preventer

Abstract

The invention belongs to the technical field of oil well anti-scaling indoor tests, and discloses an underground composite alloy anti-scaling device indoor dynamic simulation test device which comprises an anti-scaling module and a comparison module, the anti-scaling module comprises a first container water tank, a first anti-scaling test hanging piece, a composite alloy anti-scaling device, a first temperature control system and a first fluid circulation system, the first anti-scaling test hanging piece is arranged in the first container water tank, and the composite alloy anti-scaling device is arranged in the first container water tank and connected to the first fluid circulation system in series. And the comparison module comprises a second container water tank, a second anti-scaling test hanging piece, a second temperature control system and a second fluid circulation system. The invention further discloses an indoor dynamic simulation test method for the underground composite alloy anti-scaling device. The current situation of the underground scaling technology is known, and the influence rule of the temperature and the flow speed on the anti-scaling effect of the composite alloy device is obtained.

Description

Technical Field

[0001] The invention belongs to the technical field of indoor test for oil well anti-scaling, and in particular relates to an indoor dynamic simulation test device and method for a downhole composite alloy anti-scaling device. Background Art

[0002] Changqing Oilfield is a typical low-porosity and ultra-low-permeability tight reservoir with narrow oil and water phase areas. With the increase of water saturation, the permeability of the oil phase decreases rapidly, while the permeability of the water phase increases slightly in a straight line. Due to the strong water sensitivity and the high mineralization of formation water, especially the high content of calcium and magnesium ions, when two or more incompatible waters meet, the ions in the water will interact with each other to form scale; in the process of oil production, the changes of some substances will break the balance in the oilfield water, leading to the formation of scale. It is easy for scale to form in the production string of the oil well, which affects the use function of the production equipment. Severe scaling will cause the pipeline equipment to be blocked, thus affecting the production efficiency of the oil well. Secondly, the existence of different degrees of scaling in the oil well will cause different degrees of corrosion to the downhole accessories and oil production equipment of the oil well. Finally, scaling will cause the oil layer to be blocked, the production of liquid to decrease, and energy waste. It hinders the normal production of the oil well, increases the frequency of well repair, and in severe cases will lead to downhole accidents, and even the scrapping of the oil well, causing serious economic losses. Downhole scaling in oil wells is one of the prominent problems that affect the high and stable production of oil wells. Therefore, downhole scaling prevention is a very important task in the production process of oil wells.

[0003] At present, there are many means of anti-scaling, usually physical anti-scaling technology, chemical anti-scaling technology, and process descaling are used to prevent downhole scaling of oil wells. The cost of chemical anti-scaling technology is low and the effect is obvious, but in the process of using chemical anti-scaling technology, it is necessary to select appropriate drugs for treatment according to the conditions of the oil well in order to maximize its application efficiency and pollute the environment. In the actual operation process, physical and process anti-scaling technologies will be affected by many factors, resulting in difficulty in on-site implementation, high cost, and poor effect. Summary of the invention

[0004] The purpose of the present invention is to provide an indoor dynamic simulation test device and method for a downhole composite alloy scale preventer, which can safely, environmentally friendly and accurately simulate the scale prevention condition of the composite alloy scale preventer in an oil well under a dynamic environment indoors.

[0005] The technical solution adopted by the present invention is an indoor dynamic simulation test device for a downhole composite alloy anti-scaling device, including an anti-scaling module and a comparison module. The anti-scaling module includes a first container water tank, a first anti-scaling test hanging plate, a composite alloy anti-scaling device, a first temperature control system and a first fluid circulation system. The first anti-scaling test hanging plate is arranged in the first container water tank, the first temperature control system is used to control the temperature of the fluid in the first container water tank, the first fluid circulation system is used to control the circulation of the fluid in the first container water tank, and the composite alloy anti-scaling device is arranged in the first container water tank and is connected in series to the first fluid circulation system; the comparison module includes a second container water tank, a second anti-scaling test hanging plate, a second temperature control system and a second fluid circulation system. The second anti-scaling test hanging plate is arranged in the second container water tank, the second temperature control system is used to control the temperature of the fluid in the second container water tank, and the second fluid circulation system is used to control the circulation of the fluid in the second container water tank.

[0006] Preferably, the first temperature control system includes a first electric heater, a first temperature sensor, and a first temperature control regulator, and the first temperature sensor and the first electric heater are electrically connected to the first temperature control regulator respectively; the second temperature control system includes a second electric heater, a second temperature sensor, and a second temperature control regulator, and the second temperature sensor and the second electric heater are electrically connected to the second temperature control regulator respectively.

[0007] Preferably, the first electric heater and the second electric heater are electromagnetic heaters.

[0008] Preferably, the first fluid circulation system includes a first regulating valve, a first circulating water pump, a first flow meter, and a first pipeline, and the first regulating valve, the first circulating water pump, and the first flow meter are sequentially connected in series through the first pipeline; the second fluid circulation system includes a second regulating valve, a second circulating water pump, a second flow meter, and a second pipeline, and the second regulating valve, the second circulating water pump, and the second flow meter are sequentially connected in series through the second pipeline; the inlet of the first regulating valve is connected to the outlet at the bottom of the first container water tank, the inlet of the second regulating valve is connected to the outlet at the bottom of the second container water tank, the outlet of the first flow meter is connected to the inlet at the top of the first container water tank, and the outlet of the second flow meter is connected to the inlet at the top of the second container water tank.

[0009] Preferably, the first pipeline and the second pipeline are both PPR hot water pipes, the first circulating water pump and the second circulating water pump are both booster circulating water pumps, and the first flow meter and the second flow meter are both electromagnetic digital flow meters.

[0010] Preferably, the composite alloy anti-scaling device is connected in series to the first pipeline, and a first control valve and a second control valve are respectively provided on the first pipeline at both ends of the composite alloy anti-scaling device.

[0011] Preferably, the first anti-scaling test coupon and the second anti-scaling test coupon are both steel sheets.

[0012] Preferably, the first container water tank and the second container water tank have the same size, and the fluids in the first container water tank and the second container water tank are both crude oil produced from oil wells.

[0013] The present invention also provides an indoor dynamic simulation test method for a downhole composite alloy anti-scaling device, comprising the following steps: Step 1, weigh the weight of two anti-scaling test coupons respectively, hang the first anti-scaling test coupon and the second anti-scaling test coupon in the first container water tank of the anti-scaling module and the second container water tank of the comparison module respectively, and number the first anti-scaling test coupon and the second anti-scaling test coupon and record their weights; Step 2: Install the downhole composite alloy anti-scaling device and place it in the first container water tank; Step 3, setting the temperatures of the first container water tank and the second container water tank required for the test; Step 4: Add equal amounts of crude oil produced from the well into the first container water tank and the second container water tank, respectively, and check the airtightness of each part; Step 5, turning on the first electric heater and the second electric heater and turning on the first circulating water pump and the second circulating water pump to start the circulation of the crude oil; Step 6: Observe the crude oil liquid level in the first container water tank and the second container water tank every day, and add equal amounts of crude oil produced from the well into the first container water tank and the second container water tank according to the on-site situation to ensure that the first anti-scaling test coupon and the second anti-scaling test coupon are both immersed in the crude oil liquid; Step 7: After one cycle of the experiment, stop the cycle, take out the first anti-scaling test coupon and the second anti-scaling test coupon, put them into a drying oven to dry and weigh them, and observe the scaling morphology under a microscope, record and analyze, and obtain the influence of temperature and flow rate on the electromagnetic anti-wax effect.

[0014] Preferably, in step seven, one cycle is 7 days or 15 days.

[0015] The beneficial effects of the present invention are: (1) The indoor dynamic simulation test device for the downhole composite alloy anti-scaling device provided by the present invention can achieve no impact on the human body and the environment, and is a safe, environmentally friendly, energy-saving indoor equipment that meets the safety and environmental protection requirements. The dynamic test device of the present invention can accurately simulate the anti-scaling situation of the composite alloy device in the oil well in a dynamic environment in an indoor safe and environmentally friendly manner. The dynamic experiment is carried out using the relevant parameters optimized by the static experiment. By comparing the test results, the understanding of the downhole scaling mechanism of the oil well is increased. By studying the downhole scaling mechanism of the oil well, the cause and formation process of downhole scaling can be deeply understood, and the influence of temperature, flow rate, etc. on the effect of the composite alloy anti-scaling device can be obtained. When the crude oil is flowing, scaling will form in the downhole wellbore, but only a small part will adhere to the inner wall of the pipeline, and most of the scaling will stay in the pipeline or be produced with the fluid. The proportion of scaling in the pipeline is affected by the water flow rate and the concentration of scaling ions. When the water flow rate increases, the dynamic strength of the water also increases, resulting in an increase in the amount of scaling formed in the wellbore. At the same time, the range of distribution of scaling particles is also expanded, resulting in an increase in the proportion of produced scale. The greater the scaling ion concentration, the stronger the scaling tendency, and scaling mainly occurs in the horizontal section.

[0016] (2) The indoor dynamic simulation test device for downhole composite alloy anti-scaling device provided by the present invention can accurately prove the anti-scaling effect of composite alloy anti-scaling in oil wells in a short time. Composite alloy anti-scaling is a low-cost, high-efficiency, long-term physical anti-scaling method. The anti-scaling alloy is composed of metal elements with different electronegativity. There is a difference in electrode potential between these elements, which can release free electrons to the fluid medium, causing a polarization effect on the crude oil medium, increasing the deviation of the center of gravity of positive and negative charges, and increasing the solubility of minerals, thereby achieving the purpose of anti-scaling. The oil well can significantly reduce the number of well repair operations caused by scale jamming, extend the well repair cycle, and ensure continuous and uninterrupted production, thereby increasing crude oil production and improving pump efficiency and system efficiency.

[0017] (3) Compared with chemical anti-scaling, composite alloy anti-scaling can significantly increase the mass concentration of calcium and magnesium ions. Under the condition of high mineralization, it can effectively prevent the formation of scale in oil wells, improve the normal operation cycle of oil wells and the economic benefits of oil well production. There is no maintenance workload, and it is not affected by harsh environments such as rain and snow weather. At the same time, it is not affected by roads and mechanical failures. It solves the problems of long distances and poor road conditions, environmental pollution caused by the addition of chemicals for oil well anti-scaling, and difficult hot washing operations. Compared with previous anti-scaling technologies, composite alloy anti-scaling has a longer timeliness, is not affected by formation factors, has low safety risks, high anti-scaling efficiency, long action time, and is easy to use. There is no need to cut the pipeline, and it can be quickly installed, conveniently salvaged, and accurately fixed. It saves or reduces the use of chemical drugs such as scale inhibitors and corrosion inhibitors, and saves the cost of manual anti-scaling and descaling. The application prospects are very broad.

[0018] (4) The present invention is safe, environmentally friendly, and easy to operate, ensuring the reliability, versatility, and accuracy of the indoor dynamic simulation test device for the underground composite alloy anti-scaling device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of an indoor dynamic simulation test device for a downhole composite alloy anti-scaling device of the present invention.

[0020] In the figure: 1, first pipeline; 2, first flow meter; 3, first circulating water pump; 4, first regulating valve; 5, first control valve; 6, composite alloy anti-scaling device; 7, second control valve; 8, first anti-scaling test hanging plate; 9, first electric heater; 10, first temperature sensor; 11, second temperature sensor; 12, second electric heater; 13, second anti-scaling test hanging plate; 14, second pipeline; 15, second flow meter; 16, second regulating valve; 17, second circulating water pump; 18, first container water tank; 19, second container water tank; 20, first temperature control regulator; 21, second temperature control regulator; 22, computer. DETAILED DESCRIPTION

[0021] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] Example 1 like Figure 1 As shown, the indoor dynamic simulation test device for a downhole composite alloy anti-scaling device of the present invention comprises an anti-scaling module and a comparison module. The anti-scaling module comprises a first container water tank 18, a first anti-scaling test hanging plate 8, a composite alloy anti-scaling device 6, a first temperature control system and a first fluid circulation system. The first anti-scaling test hanging plate 8 is arranged in the first container water tank 18. The first temperature control system is used to control the temperature of the fluid in the first container water tank 18. The first fluid circulation system is used to control the circulation of the fluid in the first container water tank 18. The composite alloy anti-scaling device 6 is arranged in the first container water tank 18 and is connected in series to the first fluid circulation system. The comparison module comprises a second container water tank 19, a second anti-scaling test hanging plate 13, a second temperature control system and a second fluid circulation system. The second anti-scaling test hanging plate 13 is arranged in the second container water tank 19. The second temperature control system is used to control the temperature of the fluid in the second container water tank 19. The second fluid circulation system is used to control the circulation of the fluid in the second container water tank 19.

[0023] During the test, the composite alloy anti-scaling device 6 of the anti-scaling module releases free electrons to the crude oil fluid medium in the first container water tank 18, causing the crude oil medium to produce a polarization effect, increasing the deviation of the center of gravity of positive and negative charges, and increasing the solubility of mineralization, thereby achieving the purpose of anti-scaling. The comparison module is directly connected to the second container water tank 19 through a pipeline to achieve circulation.

[0024] Example 2 On the basis of Example 1, the first temperature control system includes a first electric heater 9, a first temperature sensor 10, and a first temperature control regulator 20, and the first temperature sensor 10 and the first electric heater 9 are respectively electrically connected to the first temperature control regulator 20; the second temperature control system includes a second electric heater 12, a second temperature sensor 11, and a second temperature control regulator 21, and the second temperature sensor 11 and the second electric heater 12 are respectively electrically connected to the second temperature control regulator 21. The first temperature control regulator 20 and the second temperature control regulator 21 adjust the power of the first electric heater 9 and the second electric heater 12 through the feedback signals of the first temperature sensor 10 and the second temperature sensor 11.

[0025] The first temperature control system and the second temperature control system are further provided with a computer 22 , and the first temperature control regulator 20 and the second temperature control regulator 21 are electrically connected to the computer 22 , respectively.

[0026] In order to more intuitively control the crude oil flow, the first electric heater 9 and the second electric heater 12 can be selected as electromagnetic heaters with a power of 3KW. The first temperature control system and the second temperature control are used to control the temperature of the crude oil and try to keep the temperature constant at the set value. The first temperature control regulator 20 and the second temperature control regulator 21 automatically control the first electric heater 9 and the second electric heater 12 to perform constant temperature heating control through the first temperature sensor 10 and the second temperature sensor 11 to ensure the stability of the experimental crude oil temperature.

[0027] The first fluid circulation system includes a first regulating valve 4, a first circulating water pump 3, a first flowmeter 2, and a first pipeline 1, and the first regulating valve 4, the first circulating water pump 3, and the first flowmeter 2 are sequentially connected in series through the first pipeline 1. The second fluid circulation system includes a second regulating valve 16, a second circulating water pump 17, a second flowmeter 15, and a second pipeline 14, and the second regulating valve 16, the second circulating water pump 17, and the second flowmeter 15 are sequentially connected in series through the second pipeline 14.

[0028] The first regulating valve 4 and the second regulating valve 16 are used to control the flow rate of the fluid. The rotation speed of the first circulating water pump 3 or the second circulating water pump 17 can be changed by rotating the first regulating valve 4 or the second regulating valve 16 to control the flow rate of the fluid. The fluid used in the present invention is crude oil extracted from an oil well.

[0029] The first circulating water pump 3 and the second circulating water pump 17 are used to provide the power required for circulation. Optionally, the first circulating water pump 3 and the second circulating water pump 17 are booster circulating water pumps. The circulating water pump body meets the requirements of corrosion resistance and circulation of hot and cold water, and the flow rate is controlled at more than 10L / min.

[0030] When in use, the working parameters of the first circulating water pump 3 and the second circulating water pump 17 and the opening of the first regulating valve 4 or the second regulating valve 16 are set so that the flow rate of the first pipeline 1 and the second pipeline 14 is close to the crude oil flow rate at the well site.

[0031] The first pipeline 1 and the second pipeline 14 are made of PPR hot water pipes with heat bearing capacity.

[0032] The composite alloy anti-scaling device 6 is connected in series to the first pipeline 1 , and control valves are provided on the first pipeline 1 at both ends of the composite alloy anti-scaling device 6 , namely a first control valve 5 and a second control valve 7 .

[0033] The composite alloy anti-scaling device 6 is divided into two major parts: a supporting shell and a core. The supporting shell includes inlet and outlet connectors and a protective sleeve; the core part is composed of an alloy connecting pipe column, an inner tube protective cover and alloy fan sheets. The inner tube protective cover is a cylindrical structure with a sealed bottom end. Multiple liquid inlet holes are evenly arranged on the cross section and the cylinder surface near the bottom end. The surface of the internal structure of the anti-scaling device is treated with alloy plating, which has acid and alkali resistance, neutral salt resistance and good temperature resistance, and increases the contact area between the fluid and the alloy material. The alloy anti-scaling device makes the alloy sheets into a fan shape and arranges them in a spiral to increase the contact area and give full play to the polarization effect of the alloy material on the crude oil fluid; and the composite alloy anti-scaling device is easy to remove and has a strong self-decontamination ability. The anti-scaling alloy is mainly composed of metal elements with different electronegativity such as copper, zinc, tin, nickel, manganese, and silver.

[0034] The composite alloy anti-scaling device 6 can be replaced with different alloys.

[0035] The anti-scaling principle of the composite alloy anti-scaling device 6 is: The composite alloy anti-scaling device 6 is installed on the downhole oil pump. The crude oil enters the inner cylinder from the liquid inlet end of the anti-scaling device, and then passes through the spiral cavity formed by the superposition of multiple alloys. The flow state changes to turbulent flow, which can fully contact with the alloy material, and finally flows out from the liquid outlet. The composite alloy is mainly composed of metal elements with different electronegativity such as copper, zinc, tin, nickel, manganese, silver, etc. There are differences in electrode potentials between these elements. Therefore, there will be a potential difference in the processed and prepared alloy, forming multiple tiny primary cells, which constitute a special electrochemical catalyst, which can release free electrons to the crude oil fluid medium, causing the crude oil fluid medium to produce a polarization effect. Among them, zinc with a lower electrode potential is first oxidized into ions and enters the downhole crude oil, releasing electrons. Compared with CO3 2- and free electrons, Ca 2+ Positively charged colloids are more likely to combine with electrons, and water dipoles form strong hydrated ions with calcium and magnesium ions, which increases the deviation of the center of gravity of positive and negative charges and increases the solubility of minerals, thereby achieving the purpose of downhole scale prevention in oil wells.

[0036] The container water tanks are respectively a first container water tank 18 and a second container water tank 19. The first container water tank 18 and the second container water tank 19 have the same size. In this embodiment, the first container water tank 18 and the second container water tank 19 have sizes of: 2m in length, 1m in width, 0.5m in height, and a volume of 1000L. They are made of PVC sheets. The first container water tank 18 and the second container water tank 19 are separated by a PVC sheet so as not to interfere with the circulating water.

[0037] In order to allow the crude oil to circulate and the anti-scaling part and the comparative test part of the composite alloy device to not interfere with each other, two first container water tanks 18 and second container water tanks 19 of the same size are processed. During the test, the first container water tank 18 and the second container water tank 19 can be placed side by side on the test bench.

[0038] The first container water tank 18 and the second container water tank 19 are filled with crude oil extracted from the oil well. The temperature of the first container water tank 18 and the second container water tank 19 is controlled between 80 and 90°C.

[0039] In order to obtain the amount of scaling at different positions, two anti-scaling coupons were used in the test, and the anti-scaling coupons of the anti-scaling module and the comparison module were in the same position. The first anti-scaling test coupon 8 and the second anti-scaling test coupon 13 were hung on the inside of the first container water tank 18 and the second container water tank 19, respectively. The first anti-scaling test coupon 8 and the second anti-scaling test coupon 13 were steel sheets with a size of 50mm*50mm*2mm.

[0040] Basic functions of indoor general dynamic test device: (1) It has no impact on human body and environment and is an energy-saving and environmentally friendly skid-mounted indoor equipment.

[0041] (2) The crude oil can be circulated, and the composite alloy anti-scaling part and the control part are in the same environment but are independent of each other and do not affect each other.

[0042] (3) Able to adjust and measure the flow rate of crude oil.

[0043] (4) Able to measure and adjust crude oil temperature and maintain constant temperature.

[0044] (5) The anti-scaling effect of composite alloys in oil wells under dynamic conditions can be accurately simulated indoors. Dynamic tests can be performed using the relevant parameters optimized from static tests. The results can be accurately analyzed and compared, and the effects of temperature, flow rate, etc. on the anti-scaling effect of composite alloys in oil wells can be obtained.

[0045] Example 3 The present invention also provides a general dynamic test method for underground composite alloy anti-scaling in oil wells, comprising the following steps: Step 1, weigh the weight of two anti-scaling test coupons respectively, hang the first anti-scaling test coupon 8 and the second anti-scaling test coupon 13 in the first container water tank 18 of the anti-scaling module and the second container water tank 19 of the comparison module respectively, and number the first anti-scaling test coupon 8 and the second anti-scaling test coupon 13 and record their weights; Step 2: Install the downhole composite alloy anti-scaling device 6 and place it in the first container water tank 18; Step 3, setting the temperatures of the first container water tank 18 and the second container water tank 19 required for the test; Step 4: Add equal amounts of crude oil produced from the well into the first container water tank 18 and the second container water tank 19, respectively, and check the airtightness of each part; Step 5: Turn on the first electric heater 9 and the second electric heater 12 and start the first circulating water pump 3 and the second circulating water pump 17 to start the circulation of crude oil; Step 6: Observe the crude oil liquid levels in the first container water tank 18 and the second container water tank 19 every day, and add equal amounts of crude oil produced from the well into the first container water tank 18 and the second container water tank 19 according to the on-site conditions to ensure that the first anti-scaling test coupon 8 and the second anti-scaling test coupon 13 are immersed in the crude oil liquid; Step 7: After one cycle of the experiment, stop the cycle, take out the first anti-scaling test coupon 8 and the second anti-scaling test coupon 13, put them into a drying oven for drying and weighing, and observe the scaling morphology under a microscope, record and analyze, and obtain the influence of temperature and flow rate on the electromagnetic anti-wax effect.

[0046] In the above step 4, the depth of adding crude oil into the first container water tank 18 and the second container water tank 19 is 0.3 m.

[0047] In the above step 7, one cycle is 7 days or 15 days. After one cycle, take out the anti-scaling test coupons and patches, put them into a drying oven for drying, weigh them on an electronic balance, observe the scaling morphology under a microscope, and compare and analyze the test results.

[0048] By comparing the results, the weight of the first anti-scaling test hanging piece 8 in the first container water tank 18 installed with the composite alloy anti-scaling device has almost no change, while the weight of the second anti-scaling test hanging piece 13 in the second container water tank 19 of the comparative test has increased significantly, and the second anti-scaling test hanging piece 13 has scale, which makes the weight of the second anti-scaling test hanging piece 13 increase significantly. Therefore, the anti-scaling test provided by the present invention can effectively prevent scaling in the oil well. At the same time, in this embodiment, the anti-scaling test hanging piece is made of steel sheet, which is the material of the pipeline (i.e., oil pipe) connected to each component, so that the present invention can also effectively extend the service life of the pipeline.

[0049] The invention provides a general indoor dynamic test device for oil well underground composite alloys, which can achieve no impact on the human body and the environment, and is a safe, environmentally friendly, energy-saving indoor device that meets the safety and environmental protection requirements. The invention of the dynamic test device can accurately simulate the anti-scaling situation of the oil well underground composite alloy under a dynamic environment in an indoor safe and environmentally friendly manner, and use the relevant parameters optimized by the static test to perform dynamic tests. By comparing the test results, the understanding of the scaling mechanism of the oil well underground is increased, and the scaling mechanism of the oil well underground is studied, and the causes and formation process of scaling can be deeply understood, and the influence of temperature, flow rate, etc. on the effect of the composite alloy anti-scaling device can be obtained. Under the flow state, scaling materials will be formed in the underground wellbore, but only a small part will adhere to the inner wall of the pipeline, and most of the scaling materials will stay in the pipeline or be produced together with the crude oil fluid. The proportion of scaling materials attached in the pipeline is affected by the water flow rate and the concentration of scaling ions. When the crude oil flow rate increases, the dynamic strength of the crude oil also increases, resulting in an increase in the amount of scaling formed in the wellbore, and at the same time, the range of the distribution of scaling particles is also expanded, thereby increasing the proportion of produced scale. The greater the scaling ion concentration, the stronger the scaling tendency, and scaling mainly occurs in the horizontal section.

[0050] The indoor dynamic simulation test device for the downhole composite alloy anti-scaling device provided by the present invention can accurately prove the anti-scaling effect of the downhole oil well in a short time. Composite alloy anti-scaling is a low-cost, high-efficiency, long-term physical anti-scaling method. The anti-scaling alloy is composed of metal elements with different electronegativity. There is a difference in electrode potential between these elements, which can release free electrons to the fluid medium, so that the crude oil medium produces a polarization effect, the deviation of the center of gravity of positive and negative charges increases, and the solubility of minerals is increased, thereby achieving the purpose of anti-scaling. The oil well can significantly reduce the number of well repair operations caused by scale jamming, extend the well repair cycle of the oil well, and ensure continuous and uninterrupted production, thereby increasing crude oil production and improving pump efficiency and system efficiency.

[0051] Compared with chemical anti-scaling, composite alloy anti-scaling can significantly increase the mass concentration of calcium and magnesium ions. Under the condition of high mineralization, it can effectively prevent the formation of scale in oil wells, improve the normal operation cycle of oil wells and the economic benefits of oil well production. There is no maintenance workload, and it is not affected by harsh environments such as rain and snow, and it is not affected by roads and mechanical failures. It solves the problems of long distances and poor road conditions, environmental pollution caused by the addition of anti-scaling chemicals for oil wells, and difficult hot washing operations.

[0052] Compared with previous anti-scaling technologies, the composite alloy device has a longer anti-scaling effect, is not affected by formation factors, has a low safety risk, has a high anti-scaling efficiency, a long action time, is easy to use, does not require cutting the pipeline, and can be quickly installed, conveniently salvaged, and precisely fixed. It eliminates or reduces the use of chemical agents such as scale inhibitors and corrosion inhibitors, saves the cost of manual scale prevention and removal, and its application prospects will be very broad.

[0053] Components and structures not described in detail in the embodiments are well-known components and common structures or common means in the industry and are not described one by one here.

Claims

1. An indoor dynamic simulation test device for underground composite alloy anti-scaling device, characterized in that: The invention comprises an anti-scaling module and a comparison module, wherein the anti-scaling module comprises a first container water tank (18), a first anti-scaling test hanging plate (8), a composite alloy anti-scaling device (6), a first temperature control system and a first fluid circulation system, wherein the first anti-scaling test hanging plate (8) is arranged in the first container water tank (18), the first temperature control system is used to control the temperature of the fluid in the first container water tank (18), the first fluid circulation system is used to control the circulation flow of the fluid in the first container water tank (18), and the composite alloy anti-scaling device (6) is arranged in the first container water tank (18) and is connected in series to the first fluid circulation system; the comparison module comprises a second container water tank (19), a second anti-scaling test hanging plate (13), a second temperature control system and a second fluid circulation system, wherein the second anti-scaling test hanging plate (13) is arranged in the second container water tank (19), the second temperature control system is used to control the temperature of the fluid in the second container water tank (19), and the second fluid circulation system is used to control the circulation flow of the fluid in the second container water tank (19).

2. The indoor dynamic simulation test device for underground composite alloy anti-scaling device according to claim 1 is characterized in that: The first temperature control system comprises a first electric heater (9), a first temperature sensor (10), and a first temperature control regulator (20); the first temperature sensor (10) and the first electric heater (9) are respectively electrically connected to the first temperature control regulator (20); the second temperature control system comprises a second electric heater (12), a second temperature sensor (11), and a second temperature control regulator (21); the second temperature sensor (11) and the second electric heater (12) are respectively electrically connected to the second temperature control regulator (21).

3. The indoor dynamic simulation test device for underground composite alloy anti-scaling device according to claim 2 is characterized in that: The first electric heater (9) and the second electric heater (12) are electromagnetic heaters.

4. The indoor dynamic simulation test device for underground composite alloy anti-scaling device according to claim 1 is characterized in that: The first fluid circulation system comprises a first regulating valve (4), a first circulating water pump (3), a first flow meter (2), and a first pipeline (1); the first regulating valve (4), the first circulating water pump (3), and the first flow meter (2) are sequentially connected in series through the first pipeline (1); the second fluid circulation system comprises a second regulating valve (16), a second circulating water pump (17), a second flow meter (15), and a second pipeline (14); the second regulating valve (16), the second circulating water pump (17), and the second flow meter (15) are sequentially connected in series through the second pipeline (14); the inlet of the first regulating valve (4) is connected to the outlet at the bottom of the first container water tank (18), the inlet of the second regulating valve (16) is connected to the outlet at the bottom of the second container water tank (19), the outlet of the first flow meter (2) is connected to the inlet at the top of the first container water tank (18), and the outlet of the second flow meter (15) is connected to the inlet at the top of the second container water tank (19).

5. The indoor dynamic simulation test device for underground composite alloy anti-scaling device according to claim 4 is characterized in that: The first pipeline (1) and the second pipeline (14) are both PPR hot water pipes, the first circulating water pump (3) and the second circulating water pump (17) are both booster circulating water pumps, and the first flow meter (2) and the second flow meter (15) are both electromagnetic digital flow meters.

6. The indoor dynamic simulation test device for underground composite alloy anti-scaling device according to claim 4 is characterized in that: The composite alloy anti-scaling device (6) is connected in series to the first pipeline (1), and a first control valve (5) and a second control valve (7) are respectively provided on the first pipeline (1) at both ends of the composite alloy anti-scaling device (6).

7. The indoor dynamic simulation test device for underground composite alloy anti-scaling device according to claim 1 is characterized in that: The first anti-scaling test hanging plate (8) and the second anti-scaling test hanging plate (13) are both steel plates.

8. The indoor dynamic simulation test device for underground composite alloy anti-scaling device according to claim 1 is characterized in that: The first container water tank (18) and the second container water tank (19) have the same size, and the fluids in the first container water tank (18) and the second container water tank (19) are both crude oil extracted from oil wells.

9. A method for indoor dynamic simulation test of underground composite alloy anti-scaling device, characterized in that: The steps include: Step 1, weighing the weights of two anti-scaling test hanging sheets respectively, hanging the first anti-scaling test hanging sheet (8) and the second anti-scaling test hanging sheet (13) in the first container water tank (18) of the anti-scaling module and the second container water tank (19) of the comparison module respectively, and at the same time numbering the first anti-scaling test hanging sheet (8) and the second anti-scaling test hanging sheet (13) and recording their weights; Step 2: installing the downhole composite alloy anti-scaling device (6) and placing it in the first container water tank (18); Step 3, setting the temperatures of the first container water tank (18) and the second container water tank (19) required for the test; Step 4: Add equal amounts of crude oil extracted from the well into the first container water tank (18) and the second container water tank (19), respectively, and check the airtightness of each part; Step 5: Turn on the first electric heater (9) and the second electric heater (12) and start the first circulating water pump (3) and the second circulating water pump (17) to start the circulation of the crude oil; Step 6: Observe the crude oil liquid levels in the first container water tank (18) and the second container water tank (19) every day, and add equal amounts of crude oil produced from the well into the first container water tank (18) and the second container water tank (19) according to the on-site conditions, to ensure that the first anti-scaling test coupon (8) and the second anti-scaling test coupon (13) are both immersed in the crude oil liquid; Step 7: After the experiment runs for one cycle, stop the cycle, take out the first anti-scaling test coupon (8) and the second anti-scaling test coupon (13), put them into a drying oven for drying and weigh them, and observe the scaling morphology under a microscope, record and analyze, and obtain the influence of temperature and flow rate on the electromagnetic anti-wax effect.

10. The indoor dynamic simulation test method for underground composite alloy anti-scaling device according to claim 9, characterized in that: In step seven, one cycle is 7 days or 15 days.

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