Oil well ground electromagnetic bidirectional paraffin control equipment and paraffin control method

Abstract

The invention provides oil well ground electromagnetic bidirectional paraffin control equipment and a paraffin control method.The equipment comprises an electromagnetic paraffin control device and an excitation wave generator control box, an electromagnetic coil is evenly wound around the outer wall of the electromagnetic paraffin control device, and the two ends of the electromagnetic coil are electrically connected with the excitation wave generator control box through cable connectors; sealing joints are arranged on the outer sides of the two ends of the electromagnetic converter, and couplings are arranged on the outer sides of the sealing joints. A temperature control protection measure is adopted in the excitation wave generator control box, when the temperature of the electromagnetic coil reaches a specified value of the thermosensitive element, the thermosensitive element automatically cuts off power supply to the excitation wave generator control box, and the excitation wave generator control box is not burnt out. The electromagnetic coil is powered by the excitation generator control box, real-time paraffin removal power can be adjusted according to changes of paraffin precipitation conditions, and economic benefits are obvious. Paraffin is removed in an electromagnetic conversion mode, no spark exists in the working process, and the device is suitable for field remote areas, high in weather resistance, long in service life and beneficial to environment protection of a well site.

Description

Technical Field

[0001] The invention belongs to the field of oil and gas field drilling operation equipment, and in particular relates to an oil well ground electromagnetic bidirectional wax prevention equipment and a wax prevention method. Background Art

[0002] When crude oil is extracted from underground, its temperature gradually decreases due to the influence of the formation and air temperature. Especially in winter, the temperature of crude oil drops faster during transmission in the pipeline, so wax is easily deposited on the inner wall of the oil pipeline outside the wellhead, reducing the effective diameter of the pipeline, increasing the back pressure, reducing the system efficiency and pump efficiency, and causing a decrease in oil well production. In severe cases, the pipeline will be blocked, causing economic losses and increasing production costs.

[0003] Publication No. CN112127839A discloses an oil well paraffin removal device using centralized cooling, comprising a body, the body is buried underground, a solidification chamber is arranged in the body, and end walls on both sides of the solidification chamber are fixedly connected with a material transport pipe that runs through the upper and lower end walls of the body, the material transport pipe is provided with a material transport chamber connecting the solidification chamber and the upper and lower ends of the body, and oil can be transported from bottom to top through the material transport chamber during actual operation, and a cooling device for cooling oil is arranged in the material transport chamber. During the oil production process, the oil is cooled when passing through the device, and the oil will be waxed on the inner wall of the device after the temperature drops to the waxing temperature, so that the paraffin component in the oil is greatly reduced in the device, thereby preventing the wax from forming in the well wall when the oil is subsequently transported up; the paraffin on the inner wall can be scraped off after a certain period of waxing, and the paraffin can be used as a by-product of oil production after being recovered in the equipment, thereby improving the utilization rate of resources.

[0004] The deposition and accumulation of wax in oil wells will block the oil-producing layer, increase the resistance of oil flow, reduce oil production, seriously affect the production volume and production process of oil wells, and directly affect the stable production and benefits of oil wells; wax deposition will affect the suspension point load, wax deposition will cause the increase of alternating load, and then affect the working life of the pumping rod, increase the possibility and probability of downhole accidents, increase the development cost and affect the economic effect of the oil field. Wax prevention of oil pipelines and oil wells has always been a technical problem in oil field production. The commonly used mechanical wax removal, hot washing wax removal, chemical wax removal and downhole magnetic wax prevention technologies are all effective measures for wax removal and wax prevention of oil production wells. These technologies are applied to single waxed oil wells and oil pipelines. However, a set of equipment for these technologies cannot act on several wells and oil pipelines at the same time; at the same time, chemical wax prevention technologies also have the following disadvantages or shortcomings: ① cumbersome operation; ② long cycle and high cost; ③ affecting production and polluting the formation; ④ susceptible to weather reasons such as rainy days and cannot be washed regularly.

[0005] In summary, it is urgent to invent an electromagnetic bidirectional anti-wax equipment and an anti-wax method on the surface of an oil well to meet the requirements of oil field development. Summary of the invention

[0006] In order to overcome the problem that the existing set of equipment cannot act on several wells and oil pipelines at the same time and is easily affected by weather reasons such as rain and cannot be used for periodic well washing by adding chemicals, the present invention provides an oil well ground electromagnetic two-way anti-wax equipment and an anti-wax method. The anti-wax effect of the present invention is obvious, replacing mechanical wax cleaning, hot washing wax cleaning, chemical wax cleaning and anti-wax and downhole magnetic wax cleaning technologies, and at the same time can intelligently clean wax to reduce costs and increase efficiency.

[0007] The technical solution adopted by the present invention is: An electromagnetic bidirectional wax prevention equipment for oil wells on the ground comprises an electromagnetic wax preventer, a cable joint and an excitation wave generator control box. The outer wall of the electromagnetic wax preventer is evenly wound with an electromagnetic coil, and the two ends of the electromagnetic coil are electrically connected to the excitation wave generator control box through a cable joint. Sealing joints are provided on the outer sides of the two ends of the electromagnetic converter, and couplings are provided on the outer sides of the sealing joints.

[0008] The electromagnetic converter is divided into a front electromagnetic converter and a rear electromagnetic converter, which are connected in series; the front electromagnetic converter includes a front strong magnetic oil flow pipe and a front part of the electromagnetic coil; the rear electromagnetic converter includes a rear strong magnetic oil flow pipe and a rear part of the electromagnetic coil.

[0009] The front strong magnetic oil flow pipe and the rear strong magnetic oil flow pipe have the same structural material, and are both made of strong magnetic magnets, neodymium iron boron, into a hollow cylindrical shape.

[0010] The wall thickness of the front strong magnetic oil flow pipe and the rear strong magnetic oil flow pipe is at least 4mm and the pressure resistance is 5Mpa.

[0011] A sheath layer is arranged on the outer side of the electromagnetic coil, and a filler is arranged between the electromagnetic coil and the sheath layer.

[0012] The sealing joint includes an oil well side oil seal and an oil pipeline side oil seal; the coupling includes an oil well outlet pipeline coupling and an oil pipeline side coupling, the oil well outlet pipeline coupling is connected to the oil well outlet pipeline, and the oil pipeline side coupling is connected to the ground oil pipeline.

[0013] The excitation wave generator control box includes an AC power supply unit, a rectifier and filter unit, a current detection unit, a current stabilization unit, a frequency sweep signal generator unit, a PWM conversion unit, an H-bridge drive signal unit and an H-bridge control unit. When the excitation wave generator control box is in use, the AC power supply unit is first connected to external industrial electricity. A part of the AC power passes through the rectifier and filter unit, the current detection unit and the current stabilization unit to generate an H-bridge drive signal to control the H-bridge drive; the other part of the AC power passes through the frequency sweep signal generator unit, the PWM conversion unit and the H-bridge signal drive unit, and is converted into the required AC voltage to power the electromagnetic coil. The AC power supply unit of the other part is converted into an AC voltage with a frequency of 20KHz and a voltage of 400V to supply power to the electromagnetic coil after passing through the sweep signal generator unit, the PWM conversion unit and the H-bridge signal driving unit.

[0014] The electromagnetic coil is a silicone inductor cable with a withstand voltage of 1000V.

[0015] A wax prevention method for electromagnetic bidirectional wax prevention equipment on the ground of an oil well comprises the following steps: when the electromagnetic converter works in the forward direction, an excitation wave generator control box supplies 20KHz high-frequency electricity to the rear electromagnetic converter, the rear electromagnetic converter works, and the electromagnetic conversion acts on the electromagnetic field energy formed by the wall of the ground oil pipeline to carry out electromagnetic wax prevention on the ground oil pipeline, and the front electromagnetic converter does not work; when the electromagnetic converter works in the reverse direction, the excitation wave generator control box supplies 20KHz high-frequency electricity to the electromagnetic converter, the front electromagnetic converter works, and the electromagnetic conversion acts on the electromagnetic field energy formed by the wall of the oil well pipe to carry out electromagnetic wax prevention on the oil well pipe column, and the rear electromagnetic converter does not work.

[0016] Beneficial effects of the present invention: In the present invention, a temperature control protection measure is adopted in the excitation wave generator control box. When the temperature of the electromagnetic coil reaches the specified value of the thermistor, the thermistor automatically disconnects the power supply to the excitation wave generator control box, and the excitation wave generator control box is not burned.

[0017] The oil well ground electromagnetic bidirectional anti-wax equipment provided by the present invention is easy to disassemble, can work continuously, has high reliability, and has low use cost. It can be simultaneously applied to the oil well pipe column and the ground oil pipeline for anti-wax, has good anti-wax effect, has an effective distance of more than 1,500 meters, can effectively extend the well washing cycle by more than 2-5 times, and does not cause environmental pollution.

[0018] The oil well ground electromagnetic bidirectional anti-wax equipment provided by the present invention has a wide range of applications and is suitable for all wax-containing oil wells. It is not only applicable to a single oil well, but can also act on multiple oil wells at the same time.

[0019] The invention supplies power to the electromagnetic coil through an excitation wave generator control box, can adjust the wax removal power in real time according to the wax deposition situation, and has obvious economic benefits.

[0020] The invention removes wax by electromagnetic conversion, has no sparks during the working process, is suitable for remote outdoor areas, has strong weather resistance, long service life, and is beneficial to the environmental protection of the well site.

[0021] The control box of the excitation wave generator of the present invention adopts a remote controller, so that the present invention does not need to be watched during use and is simple to use and maintain.

[0022] The oil well of the present invention realizes the elimination of the need for adding chemicals and hot washing, reduces the amplitude of the alternating loads of the oil pipe and the sucker rod, prolongs the service life of the oil pipe and the sucker rod, and at the same time, has an obvious energy-saving effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described in detail below with reference to the accompanying drawings.

[0024] Figure 1 It is a schematic diagram of the structure of the ground electromagnetic bidirectional anti-wax equipment of the present invention; Figure 2 It is the electromagnetic conversion control circuit diagram of the present invention.

[0025] In the figure, the reference numerals are: 1. Oil well outlet pipeline coupling; 2. Oil well side oil seal; 3. Electromagnetic wax preventer; 4. Connecting electromagnetic coil cable; 5. Cable connector; 6. Control electromagnetic coil cable; 7. Oil pipeline side oil seal; 8. Oil pipeline side coupling; 9. Front strong magnetic oil flow pipe; 10. Rear strong magnetic oil flow pipe; 11. Electromagnetic coil; 12. Excitation wave generator control box; 13. Oil pipeline. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] Various structural schematic diagrams of the embodiments disclosed in the present invention are shown in the accompanying drawings. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0028] Embodiment 1: In order to overcome the problem that the existing set of equipment cannot act on several wells and oil pipelines at the same time and is susceptible to weather reasons such as rainy days and cannot be used for periodic well washing, the present invention provides a Figure 1 and Figure 2 The shown is an electromagnetic bidirectional anti-wax equipment and anti-wax method for oil wells on the ground. The invention has obvious anti-wax effect, replacing mechanical wax cleaning, hot washing wax cleaning, chemical wax cleaning and anti-wax and downhole magnetic wax cleaning technologies, and at the same time can intelligently clean wax to reduce costs and increase efficiency.

[0029] An electromagnetic bidirectional wax prevention equipment for oil wells on the ground comprises an electromagnetic wax preventer 3, a cable connector 5 and an excitation wave generator control box 12. The outer wall of the electromagnetic wax preventer 3 is evenly wound with an electromagnetic coil 11. Both ends of the electromagnetic coil 11 are electrically connected to the excitation wave generator control box 12 through a cable connector 6. Sealing joints are provided on the outer sides of both ends of the electromagnetic converter 3, and couplings are provided on the outer sides of the sealing joints.

[0030] In order to reduce the magnetic resistance of the magnetic circuit, the electromagnetic converter 3 is divided into two parts. The magnetic forces are mutually enhanced during operation to improve the electromagnetic conversion efficiency. The electromagnetic converter is divided into a front electromagnetic converter and a rear electromagnetic converter. The outer walls of the strong magnetic oil flow pipe 9 and the strong magnetic oil flow pipe 10 are evenly wound with electromagnetic coils 11.

[0031] When the present invention is used in a specific application, when the electromagnetic converter 3 works in the forward direction, the excitation wave generator control box 12 supplies 20KHz high-frequency electricity to the rear electromagnetic converter, the rear electromagnetic converter works, and the electromagnetic conversion acts through the electromagnetic field energy formed by the wall of the ground oil pipeline to perform electromagnetic anti-wax treatment on the ground oil pipeline 13, and the front electromagnetic converter does not work. When the electromagnetic converter 3 works in the reverse direction, the excitation wave generator control box 12 supplies 20KHz high-frequency electricity to the electromagnetic converter 3, the front electromagnetic converter works, and the electromagnetic conversion acts through the electromagnetic field energy formed by the wall of the oil well pipe to perform electromagnetic anti-wax treatment on the oil well pipe string, and the rear electromagnetic converter does not work.

[0032] Under the action of the excitation current, the electromagnetic converter 3 generates electromagnetic waves, which will propagate along the metal pipe with smaller magnetic resistance as the medium, generate a magnetic field in the metal pipe, and the magnetic field acts on the fluid in the pipe to complete the anti-wax function. When the bidirectional anti-wax equipment is working in the forward direction, the electromagnetic wave will propagate along the oil pipeline to prevent wax on the ground pipeline, and when working in the reverse direction, the electromagnetic wave will propagate along the oil well pipe column to prevent wax on the oil well. The molecular arrangement structure can be changed to make the disordered molecular clusters become polarized stable molecular chains, which are accumulated on the inner surface of the pipe, so that it loses the ability to separate from the solution and attach to the inner pipe wall, so that the paraffin molecules are suspended in the oil and are not easy to crystallize. The electromagnetic conversion power can also be adjusted according to seasonal temperature changes, saving energy, no sparks during the working process, suitable for remote areas in the wild, strong weather resistance, long service life, no need for on-duty, simple use and maintenance, obvious economic benefits, and also conducive to well site environmental protection, achieving and matching the needs of oil field development.

[0033] In the present invention, after the electromagnetic converter 3 is powered on, when the electromagnetic converter 3 works in the forward direction, the excitation wave generator control box 12 performs high-frequency power supply to the rear electromagnetic converter, converts the electrical energy into adjustable broadband electric field magnetic energy, and acts on the electromagnetic field energy formed by the wall of the ground oil pipeline to perform electromagnetic anti-waxing of the ground electromagnetic oil pipeline, and the front electromagnetic converter does not work. When the electromagnetic converter works in the reverse direction, the excitation wave generator control box 12 performs high-frequency power supply to the front electromagnetic converter, converts the electrical energy into adjustable broadband electric field magnetic energy, and acts on the electromagnetic field energy formed by the wall of the oil well pipe to perform electromagnetic anti-waxing of the oil well pipe column, and the rear electromagnetic converter does not work. After the electromagnetic field energy acts on the fluid, it can change the molecular arrangement structure, so that the disordered molecular clusters become polarized stable molecular chains, which are accumulated on the inner surface of the pipe, so that it loses the ability to separate from the solution and attach to the inner pipe wall, so that the paraffin molecules are suspended in the petroleum and are not easy to crystallize and precipitate.

[0034] The electromagnetic bidirectional anti-wax equipment for oil wells on the ground of the present invention is easy to dismantle, can work continuously, has high reliability, and has low use cost. It can be simultaneously applied to the oil well pipe string and the ground oil pipeline for anti-wax, has good anti-wax effect, and has an effective distance of more than 1,500 meters. It can effectively extend the well washing cycle by more than 2-5 times, and does not cause environmental pollution. The electromagnetic bidirectional anti-wax equipment for oil wells on the ground has a wide range of applications and is suitable for all wax-containing oil wells. It is not only applied to a single oil well, but can also act on multiple oil wells at the same time. The oil pipe strings of multiple oil wells are all connected to the oil well outlet pipeline after being aggregated through the corresponding branch pipelines.

[0035] The present invention supplies power to the electromagnetic coil 11 through the excitation wave generator control box 12, and can adjust the wax removal power in real time according to the wax deposition situation, with obvious economic benefits. The wax removal of the present invention is carried out by electromagnetic conversion, and there is no spark during the working process, which is suitable for remote areas in the wild, has strong weather resistance, long service life, and is beneficial to the environmental protection of the well site.

[0036] The control box 12 of the excitation wave generator of the present invention adopts a remote controller, so that the present invention does not need to be watched during use and is easy to use and maintain. The oil well is free of dosing and hot washing, the alternating load amplitude of the oil pipe and the sucker rod is reduced, the service life of the oil pipe and the sucker rod is extended, and at the same time, the energy saving effect is obvious.

[0037] Embodiment 2: Based on Example 1, in the present invention, preferably, the electromagnetic converter 3 is divided into a front electromagnetic converter and a rear electromagnetic converter, and the front electromagnetic converter and the rear electromagnetic converter are connected in series; the front electromagnetic converter includes a front strong magnetic oil flow pipe 9 and a front part of the electromagnetic coil 11; the rear electromagnetic converter includes a rear strong magnetic oil flow pipe 10 and a rear part of the electromagnetic coil 11.

[0038] In order to improve the efficiency of the electromagnetic converter 3, the front electromagnetic converter and the rear electromagnetic converter are used in series. In specific applications, the strong magnetic oil flow pipe 9 and the strong magnetic oil flow pipe 10 in the front electromagnetic converter and the rear electromagnetic converter are both made of strong magnetic magnets NdFeB, and the manufacturing size is preferably: DN60, 400mm long, 4mm thick, and 5Mpa pressure resistance.

[0039] In the present invention, the electromagnetic coil 11 is preferably 5 m long and has a cross-sectional area of ​​25×0.1 m 2 Silicone inductor cable, withstand voltage 1000V. In the present invention, the excitation wave generator control box 12 adopts temperature control protection measures. When the temperature of the electromagnetic coil reaches the specified value of the thermistor, the thermistor automatically disconnects the power supply to the excitation wave generator control box 12, and the excitation wave generator control box 12 is not burned.

[0040] Preferably, the front strong magnetic oil flow pipe 9 and the rear strong magnetic oil flow pipe 10 have the same structural material, and are both made of strong magnetic magnets NdFeB into a hollow cylindrical shape.

[0041] Preferably, the wall thickness of the front strong magnetic oil flow pipe 9 and the rear strong magnetic oil flow pipe 10 is at least 4 mm and the pressure resistance is 5 MPa.

[0042] In the present invention, in order to reduce the magnetic resistance of the magnetic circuit, the electromagnetic converter 3 is divided into two parts. When working, the magnetic forces are mutually enhanced to improve the electromagnetic conversion efficiency. The electromagnetic converter is divided into a front electromagnetic converter and a rear electromagnetic converter. The outer walls of the front strong magnetic oil flow tube 9 and the rear strong magnetic oil flow tube 10 are evenly wound with electromagnetic coils 11. In specific applications, after power is turned on, when the electromagnetic converter 3 works in the forward direction, the excitation wave generator control box 12 provides high-frequency power supply to the rear electromagnetic converter 10, converts the electrical energy into adjustable broadband electric field magnetic energy, and through the electromagnetic field energy formed by the wall of the ground oil pipeline, the electromagnetic anti-wax of the ground electromagnetic oil pipeline is performed, and the front electromagnetic converter does not work. When the electromagnetic converter works in the reverse direction, the excitation wave generator control box 12 provides high-frequency power supply to the front electromagnetic converter, converts the electrical energy into adjustable broadband electric field magnetic energy, and through the electromagnetic field energy formed by the wall of the oil well pipe, the electromagnetic anti-wax of the oil well pipe column is performed, and the rear electromagnetic converter does not work. When the electromagnetic field energy acts on the fluid, it can change the molecular arrangement structure, turning the disordered molecular clusters into polarized stable molecular chains, which accumulate on the inner surface of the tube, causing it to lose the ability to separate from the solution and attach to the inner tube wall, making the paraffin molecules suspended in the petroleum and not easy to crystallize and precipitate.

[0043] Preferably, a sheath layer is provided on the outer side of the electromagnetic coil 11, and a filler is provided between the electromagnetic coil 11 and the sheath layer.

[0044] A temperature control protection material layer is provided on the outside of the electromagnetic converter 3. In specific applications, an asbestos protection material layer is provided on the outside of the electromagnetic converter 3. The provision of the asbestos protection material layer makes the heating and heat preservation effect better and saves energy.

[0045] Preferably, the sealing joint includes an oil well side oil seal 2 and an oil pipeline side oil seal 7; the coupling includes an oil well outlet pipeline coupling 1 and an oil pipeline side coupling 8, the oil well outlet pipeline coupling 1 is connected to the oil well outlet pipeline, and the oil pipeline side coupling 8 is connected to the ground oil pipeline 13.

[0046] In the present invention, the oil pipe strings of multiple oil wells are connected to the oil well outlet pipeline after being collected through corresponding branch pipelines. In this way, during the wax prevention process, the oil pipe strings of the oil well are subjected to wax prevention treatment after passing through the oil well outlet pipeline and each branch pipeline.

[0047] Preferably, the excitation wave generator control box 12 includes an AC power supply unit, a rectifier and filter unit, a current detection unit, a current stabilization unit, a frequency sweep signal generator unit, a PWM conversion unit, an H-bridge drive signal unit and an H-bridge control unit. When the excitation wave generator control box 12 is in use, the AC power supply unit is first connected to external industrial electricity. A part of the AC power passes through the rectifier and filter unit, the current detection unit and the current stabilization unit to generate an H-bridge drive signal to control the H-bridge drive; the other part of the AC power passes through the frequency sweep signal generator unit, the PWM conversion unit, the H-bridge signal drive unit and the H-bridge control unit, and is converted into the required AC voltage to power the electromagnetic coil 11.

[0048] like Figure 2 As shown, connect the AC power supply unit to 380V 50 / 60Hz industrial power.

[0049] Preferably, the AC power supply unit of the other part is converted into an AC voltage with a frequency of 20KHz and a voltage of 400V to power the electromagnetic coil 11 after passing through the sweep signal generator unit, the PWM conversion unit and the H-bridge signal driving unit.

[0050] Preferably, the electromagnetic coil 11 is a silicone inductor cable with a withstand voltage of 1000V.

[0051] In the present invention, the electromagnetic coil 11 preferably has a length of 5 m and a cross-sectional area of ​​25×01 m 2 Silicone inductor cable, withstand voltage 1000V.

[0052] In the present invention, the PWM conversion unit, the H-bridge driving signal unit and the H-bridge control unit are all existing units, and will not be further described in the present invention.

[0053] In the present invention, the AC power supply unit: uses an anti-interference isolation transformer, which refers to a transformer with electrical isolation between the input winding and the output winding. The isolation transformer is used to avoid accidental contact with the charged body at the same time. The isolation of the transformer is to isolate the current of the primary and secondary windings. Preferably, a 50KWSBK SG three-phase (dry-type isolation transformer) produced by Shanghai Yingshidan Electric Group Co., Ltd. is used.

[0054] In the present invention, the rectifier and filter unit: 380V AC removes AC components from the rectified DC power and converts it into a smooth DC power of 56V. Preferably, a Siemens S120 rectifier unit 6SL3320-1TE36-1AA3 model is used.

[0055] In the present invention, the current detection unit is a device for detecting direct current, which can sense the information of the measured direct current and can transform the sensed information into an electrical signal or other required form of information output according to a certain rule to meet the requirements of information transmission, processing, storage, display, recording and control. It is the primary link for realizing automatic detection and automatic control. The LOGOELE AC current detection sensor module produced by Guangzhou Longge Electronic Technology Co., Ltd. is preferably used, and the current detection range is: DC maximum 50A.

[0056] In the present invention, the current stabilizing unit is a unit capable of keeping the load current unchanged when the input voltage and the load impedance change, and preferably adopts the NSI50350A constant current stabilizer produced by NASDAQ.

[0057] In the present invention, the swept frequency signal generator unit: the swept frequency signal generator unit is a test device that can change the output frequency in a controllable manner, and preferably uses the AV1464 synthetic swept frequency signal generator AV-1464 produced by Shanghai Shuangxu Electronics Co., Ltd.

[0058] PWM conversion unit: PWM (Pulse Width Modulation) control-pulse width modulation technology, by modulating the width of a series of pulses, to equivalently obtain the required waveform (including shape and amplitude), the applied inverter circuit is mostly PWM type. The main function of the PWM conversion unit is to convert the amplitude of the input voltage into a pulse of a certain width, in other words, it converts the amplitude data into pulse width. The general output circuit can only output a signal with a certain voltage amplitude. In order to output a signal with a voltage amplitude change such as a sine wave, it is necessary to convert the voltage amplitude into a pulse signal. The PWM conversion unit preferably uses TDX-1203000 produced by Shenzhen Tengdaxing Electronics Co., Ltd. to convert 48V / 20A to 24V / 10A.

[0059] In the present invention, the H-bridge drive signal unit: the H-bridge drive signal unit is a unipolar mode, with the advantages of fast startup and acceleration. It is preferred to use the G2056F11U low-voltage H-bridge drive signal device produced by Shenzhen Kerry Core Electronics Co., Ltd. In the present invention, the H-bridge control unit: is an independently developed H-bridge unit, model CQH, and the unit includes 4 transistors and a heating control coil. To heat the heating coil, a pair of transistors on the diagonal must be turned on. Depending on the conduction of different transistor pairs, the current may flow through the heating coil from left to right or from right to left, thereby controlling the direction of coil heating.

[0060] Embodiment 3: Based on Example 3, this embodiment provides an anti-wax method for electromagnetic bidirectional anti-wax equipment on the ground of an oil well, comprising the following steps: when the electromagnetic converter 3 works in the forward direction, the excitation wave generator control box 12 supplies 20KHz high-frequency electricity to the rear electromagnetic converter, the rear electromagnetic converter works, and the electromagnetic conversion acts through the electromagnetic field energy formed by the wall of the ground oil pipeline to perform electromagnetic anti-wax on the ground oil pipeline 13, and the front electromagnetic converter does not work; when the electromagnetic converter 3 works in the reverse direction, the excitation wave generator control box 12 supplies 20KHz high-frequency electricity to the electromagnetic converter 3, the front electromagnetic converter works, and the electromagnetic conversion acts through the electromagnetic field energy formed by the wall of the oil well pipe to perform electromagnetic anti-wax on the oil well pipe string, and the rear electromagnetic converter does not work.

[0061] like Figure 1 and Figure 2 As shown, an electromagnetic bidirectional anti-wax equipment and anti-wax method for oil well surface, specifically comprising the following steps: Step 1: The electromagnetic two-way wax prevention equipment on the oil well surface only needs to be installed between the oil well and the oil pipeline 13 through a clamp at the wellhead of the oil well. Before installation, the machine must be shut down, the main power switch must be turned off, the oil well valve must be closed, and the oil, water, gas and other media must be drained before construction can begin. First, cut off the original pipeline; weld the clamp; then install the electromagnetic two-way wax prevention equipment on the oil well surface in between, with the arrow pointing to the direction of fluid flow; adjust the fastening screws.

[0062] Step 2: Before installation, confirm whether the rated voltage of the power line matches that of the excitation wave generator control box 12. Before wiring, the power should be completely turned off to ensure construction safety. Connect the power cord to the lower end of the switch in the excitation wave generator control box 12, complete the wiring and power-on work, and bury the armored cable of the excitation wave generator control box directly underground. At this point, the installation work is completed.

[0063] Step 3: After the electromagnetic bidirectional anti-wax equipment on the oil well surface is powered on for a few minutes, the surface of the electromagnetic converter 3 has a certain working temperature rise. This is a normal phenomenon. When the working temperature reaches a certain temperature, the temperature controller will automatically stop working, and will automatically power on and continue to work after the temperature drops.

[0064] Step 4: When the electromagnetic bidirectional anti-wax equipment on the surface of the oil well is working in the forward direction, the conversion switch in the excitation wave generator control box 12 is set in the forward working position. When the electromagnetic converter 3 is working in the forward direction, the excitation wave generator control box 12 provides high-frequency power supply to the rear electromagnetic converter. When the rear electromagnetic converter is working, the electromagnetic field energy formed by the wall of the surface oil pipeline is used to perform electromagnetic anti-wax on the surface oil pipeline 13, and the front electromagnetic converter does not work. When the electromagnetic bidirectional anti-wax equipment on the surface of the oil well is working in the reverse direction, the conversion switch in the excitation wave generator control box 12 is set in the reverse working position. When the electromagnetic converter 3 is working in the reverse direction, the excitation wave generator control box 12 provides high-frequency power supply to the front electromagnetic converter. When the front electromagnetic converter is working, the electromagnetic field energy formed by the wall of the oil well pipe is used to perform electromagnetic anti-wax on the oil well pipe string, and the rear electromagnetic converter does not work.

[0065] Step 5: When the electromagnetic converter of the electromagnetic bidirectional wax prevention equipment has a problem or when a well repair operation is performed, the excitation wave generator control box 12 is stopped from working.

[0066] Under the action of the excitation current, the electromagnetic converter 3 of the present invention generates electromagnetic waves, which will propagate along the metal pipe with a small magnetic resistance as a medium, generate a magnetic field in the metal pipe, and the magnetic field acts on the fluid in the pipe to complete the anti-wax function. When the bidirectional anti-wax equipment works in the forward direction, the electromagnetic waves will propagate along the oil pipeline to prevent wax on the ground pipeline, and when working in the reverse direction, the electromagnetic waves will propagate along the oil well pipe string to prevent wax on the oil well. The molecular arrangement structure can be changed, so that the disordered molecular clusters become polarized stable molecular chains, which are accumulated on the inner surface of the pipe, so that it loses the ability to separate from the solution and attach to the inner pipe wall, so that the paraffin molecules are suspended in the oil and are not easy to crystallize and precipitate.

[0067] The electromagnetic conversion power in the present invention can also be adjusted according to seasonal temperature changes, thus saving energy. There is no spark during operation and it is suitable for remote outdoor areas. It has strong weather resistance, long service life, no need for supervision, simple use and maintenance, and obvious economic benefits. It is also beneficial to well site environmental protection and meets the needs of oil field development. The invention has a simple implementation process, a safe use process, and an obvious anti-wax effect on oil wells and oil pipelines, while meeting the development needs of intelligent oil fields. The invention can implement anti-wax operations at different temperatures according to the actual conditions of the four seasons, greatly saving energy and costs. External 380V voltage 50 / 60Hz industrial electricity In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0068] It should also be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0069] The above examples are merely illustrative of the present invention and do not constitute a limitation on the protection scope of the present invention. Any design that is the same or similar to the present invention belongs to the protection scope of the present invention. The device structures and method steps not described in detail in the present invention are all prior art and will not be further described in the present invention.

Claims

1. An electromagnetic bidirectional anti-wax equipment for oil wells. Features: The invention comprises an electromagnetic wax preventer (3), a cable connector (5) and an excitation wave generator control box (12); the outer wall of the electromagnetic wax preventer (3) is evenly wound with an electromagnetic coil (11); the two ends of the electromagnetic coil (11) are electrically connected to the excitation wave generator control box (12) via a cable connector (6); sealing connectors are provided on the outer sides of the two ends of the electromagnetic converter (3); and couplings are provided on the outer sides of the sealing connectors.

2. According to claim 1, an electromagnetic bidirectional anti-wax equipment for oil wells, Features: The electromagnetic converter (3) is divided into a front electromagnetic converter and a rear electromagnetic converter, and the front electromagnetic converter and the rear electromagnetic converter are connected in series; the front electromagnetic converter includes a front strong magnetic oil flow pipe (9) and a front part of the electromagnetic coil (11); the rear electromagnetic converter includes a rear strong magnetic oil flow pipe (10) and a rear part of the electromagnetic coil (11).

3. The electromagnetic bidirectional anti-wax equipment for oil wells according to claim 2, Features: The front strong magnetic oil flow pipe (9) and the rear strong magnetic oil flow pipe (10) have the same structural material and are both made of strong magnetic magnets, neodymium iron boron, into a hollow cylindrical shape.

4. The electromagnetic bidirectional anti-wax equipment for oil wells according to claim 3, Features: The wall thickness of the front strong magnetic oil flow pipe (9) and the rear strong magnetic oil flow pipe (10) is at least 4 mm and has a pressure resistance of 5 MPa.

5. The electromagnetic bidirectional anti-wax equipment for oil wells according to claim 1, Features: A sheath layer is provided on the outer side of the electromagnetic coil (11), and a filler is provided between the electromagnetic coil (11) and the sheath layer.

6. The electromagnetic bidirectional anti-wax equipment for oil wells according to claim 1, Features: The sealing joint comprises an oil well side oil seal (2) and an oil pipeline side oil seal (7); the coupling comprises an oil well outlet pipeline coupling (1) and an oil pipeline side coupling (8); the oil well outlet pipeline coupling (1) is connected to the oil well outlet pipeline, and the oil pipeline side coupling (8) is connected to the ground oil pipeline (13).

7. The oil well surface electromagnetic bidirectional anti-wax equipment according to claim 1, Features: The excitation wave generator control box (12) comprises an AC power supply unit, a rectifier and filter unit, a current detection unit, a current stabilization unit, a frequency sweep signal generator unit, a PWM conversion unit, an H-bridge drive signal unit and an H-bridge control unit. When the excitation wave generator control box (12) is in use, the AC power supply unit is first connected to external industrial electricity, and a part of the AC power passes through the rectifier and filter unit, the current detection unit and the current stabilization unit to generate an H-bridge drive signal to control the H-bridge drive; the other part of the AC power passes through the frequency sweep signal generator unit, the PWM conversion unit and the H-bridge signal drive unit, and is converted into the required AC voltage to power the electromagnetic coil (11).

8. The oil well surface electromagnetic bidirectional anti-wax equipment according to claim 7, Features: The AC power supply unit of the other part is converted into an AC voltage with a frequency of 20KHz and a voltage of 400V after passing through the sweep signal generator unit, the PWM conversion unit and the H-bridge signal driving unit to supply power to the electromagnetic coil (11).

9. The oil well surface electromagnetic bidirectional anti-wax equipment according to claim 1, Features: The electromagnetic coil (11) is a silicone inductor cable with a withstand voltage of 1000V.

10. The anti-wax method of any one of the oil well surface electromagnetic bidirectional anti-wax equipment according to claims 1-9, Features: The method comprises the following steps: when the electromagnetic converter (3) works in the forward direction, the excitation wave generator control box (12) supplies 20KHz high-frequency electricity to the rear electromagnetic converter, the rear electromagnetic converter works, the electromagnetic conversion acts through the electromagnetic field energy formed by the wall of the ground oil pipeline, and the ground oil pipeline (13) is electromagnetically protected from wax, and the front electromagnetic converter does not work; when the electromagnetic converter (3) works in the reverse direction, the excitation wave generator control box (12) supplies 20KHz high-frequency electricity to the electromagnetic converter (3), the front electromagnetic converter works, the electromagnetic conversion acts through the electromagnetic field energy formed by the wall of the oil well pipe, and the oil well pipe string is electromagnetically protected from wax, and the rear electromagnetic converter does not work.

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