Sucker rod heating device applied to wellhead of oil field

Abstract

The sucker rod heating device comprises a heating vertical frame, a motion driving assembly and an electromagnetic assembly, a transmission sleeve box is fixedly installed at the top end of the heating vertical frame, the motion driving assembly is fixedly installed on the bottom face of the transmission sleeve box, and a rotating bearing sliding ring is fixedly installed on the surface of the heating vertical frame; the motion driving assembly comprises a protective sleeve seat, a rotating sleeve seat and a plurality of rotor stacked rings fixedly installed on the inner side of the rotating sleeve seat, the rotating sleeve seat is rotationally installed on the inner side of the protective sleeve seat, and a transmission gear ring is arranged on the surface of the rotating sleeve seat. According to the electromagnetic heating device, a novel electromagnetic heating mode is set, a moving electromagnetic assembly structure is arranged outside the conductor, when the sucker rod serves as the conductor and is located in a variable magnetic field, induced current can be generated in the conductor according to the Faraday's law of electromagnetic induction, the induced current can generate resistance loss in the conductor, the conductor is heated, and the sucker rod is heated. And heat conduction is not needed, and the energy utilization rate is increased.

Description

Technical Field

[0001] The invention relates to the technical field of oilfield wellhead heating, in particular to a pumping rod heating device applied to an oilfield wellhead. Background Art

[0002] At present, the total geological reserves of heavy oil in my country are about 1.2 billion cubic meters, and its annual output accounts for 9% of the total annual output of onshore crude oil. Therefore, how to effectively exploit heavy oil has become a hot topic in the field of oil field exploitation. The colloid and asphalt content of heavy oil is high, so the viscosity of heavy oil is high and the fluidity is poor, which seriously affects the recovery rate of heavy oil. However, the viscosity of heavy oil is very sensitive to temperature. Heating heavy oil can effectively reduce the viscosity of heavy oil. Therefore, in order to improve the recovery rate of heavy oil, it is generally necessary to heat the pumping rod of the pumping unit in heavy oil exploitation to reduce the viscosity of the heavy oil during the lifting process out of the well.

[0003] At present, most of the oilfield pumping processes use hot water (or hot oil) circulation heating extraction methods, that is, the heated liquid enters from the middle casing and the oil pipe, and then returns to the ground from the middle casing and the outer casing. This heating method has low thermal efficiency and is not suitable for the extraction of extra-heavy oil and super-heavy oil. Another commonly used method is to use a deep well oil electromagnetic heating device, which consists of a ground power supply, a downhole electromagnetic heater, an oil pipe, and a casing. The structure of the heater is an oil pipe, an insulating layer, a copper coil, and an insulating material from the inside to the outside. The working principle is to form a magnetic field after supplying power to the copper coil, and form an eddy current on the oil pipe to generate heat to heat the crude oil. In order to ensure the fluidity of crude oil in the ground pipeline and avoid the precipitation of wax, the on-site wellbore heating temperature can usually reach above 55°C, while the near-surface formation temperature is less than 20°C. The heat of the heating device is transferred to the surface of the sucker rod through heat conduction, thermal radiation, natural convection, etc. Under some well conditions, the heat lost from the wellbore to the formation is greater than the heat absorbed by the temperature rise of the fluid in the wellbore, resulting in huge energy waste.

[0004] In view of this, research and improvement are carried out on the existing problems, and a sucker rod heating device applied to the wellhead of an oil field is provided to solve the current problems. The purpose is to achieve the purpose of solving the problems and improving the practical value through this technology. Summary of the invention

[0005] The present invention aims to solve one of the technical problems existing in the prior art or related technology.

[0006] To this end, the technical solution adopted by the present invention is: a sucker rod heating device applied to an oil field wellhead, comprising: a heating stand, a motion drive assembly and an electromagnetic assembly, a transmission sleeve box is fixedly installed on the top of the heating stand, the motion drive assembly is fixedly installed on the bottom surface of the transmission sleeve box, a slewing bearing slip ring is fixedly installed on the surface of the heating stand, the motion drive assembly comprises a protective sleeve seat, a rotating sleeve seat and a plurality of rotor stacking rings fixedly installed on the inner side of the rotating sleeve seat, the rotating sleeve seat is rotatably installed on the inner side of the protective sleeve seat and a transmission gear ring is provided on the surface of the rotating sleeve seat, a driving motor is fixedly installed on the top surface of the transmission sleeve box, and the output end of the driving motor is transmission-connected to the surface of the transmission gear ring, the number of the electromagnetic assemblies is several and evenly divided into several groups, and each group of electromagnetic assemblies is evenly distributed on the surface of each rotor stacking ring in the circumferential direction; The electromagnetic assembly includes an adjustment seat, a movable slide seat, an electromagnet and an electromagnetic control board. The electromagnet and the electromagnetic control board are fixedly installed on the surface of the movable slide seat. The adjustment seat is radially fixed to the surface of the rotor stack ring. The input end of the electromagnetic control board is electrically connected to the current generator, and the output end of the electromagnetic control board is electrically connected to the electrode of the electromagnet. The electromagnetic control board is used to convert the input current into alternating current of different frequencies.

[0007] In a preferred example, the present invention can be further configured as follows: the surfaces of the transmission sleeve box, protective sleeve seat, swivel sleeve seat and swivel bearing slip ring are provided with sleeve holes for the sucker rod to pass through, and the bottom end of the swivel sleeve seat is provided with a pipe head that is sleeved on the inner side of the swivel bearing slip ring.

[0008] In a preferred example, the present invention can be further configured as follows: a plurality of the rotor stack rings are stacked and arranged on the inner side of the rotating sleeve, and the outer periphery of the rotor stack rings and the inner wall of the rotating sleeve seat abut against each other, and the electromagnetic assembly is located between adjacent rotor stack rings.

[0009] In a preferred example, the present invention can be further configured as follows: a cover is fixedly mounted on the surface of the adjustment seat, and the cover is a metal or ceramic component used for rapid heat dissipation of the electromagnet and the electromagnetic control board.

[0010] In a preferred example, the present invention can be further configured as follows: an electric slip ring is provided on the inner side of the transfer bearing slip ring, the input end of the electric slip ring is point-connected to a current generator fixed on the surface of the heating stand, and an electrode ring group connected to an electromagnetic control board is provided on the surface of the sleeve at the bottom end of the transfer sleeve.

[0011] In a preferred example, the present invention can be further configured as follows: the movable slide is slidably mounted on the surface of the adjustment seat and a screw for locking the position of the movable slide is provided on the surface of the adjustment seat, and the adjustment seat and the electromagnet are arranged in a radial direction.

[0012] In a preferred example, the present invention can be further configured as follows: the electromagnet includes an electromagnetic coil and an iron core structure located inside the electromagnetic coil, and the electromagnet is an electromagnet structure.

[0013] In a preferred example, the present invention can be further configured as follows: the electromagnetic control board is a PCB board structure, and an electromagnetic relay, an electromagnetic lock, and an electromagnetic valve are provided on the surface of the electromagnetic control board. The electromagnetic control board adjusts the strength of the magnetic field by controlling the current passed into the electromagnet, thereby controlling the working state of the electromagnet.

[0014] The beneficial effects achieved by the present invention are: 1. In the present invention, a new electromagnetic heating method is set up, and a moving electromagnetic component structure is arranged outside the conductor. When the sucker rod as a conductor is in a changing magnetic field, according to Faraday's law of electromagnetic induction, an induced current will be generated inside the conductor. This induced current will generate resistance loss inside the conductor, causing the conductor to be heated, thereby achieving the heating of the sucker rod body without the need for heat conduction, thereby improving energy utilization.

[0015] 2. In the present invention, an alternating current is generated by an electromagnetic control board to make the electromagnet generate a changing magnetic field, and a plurality of electromagnetic components are rotated by the rotating sleeve to form a high-efficiency heating effect on the surface of the sucker rod, thereby improving the heating efficiency.

[0016] 3. In the present invention, the electromagnetic component rotates, and the moving magnetic field heating can respond to the low-frequency magnetic field in some cases. Compared with the alternating magnetic field current of eddy current heating, it has smaller current and higher safety, and can form a continuous and stable constant temperature and low temperature maintenance on the surface of the sucker rod, which is more suitable for the wellbore heating effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention; Figure 2 A schematic diagram of the internal structure of a protective sleeve seat according to an embodiment of the present invention; Figure 3 A schematic diagram of the decomposed structure of a motion drive component according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the installation structure of an electromagnetic component according to an embodiment of the present invention; Figure 5 A schematic diagram of the exploded structure of an electromagnetic component according to an embodiment of the present invention; Figure 6 The figure is a schematic diagram of the structure of an electromagnet and an electromagnetic control board according to an embodiment of the present invention.

[0018] Reference numerals: 100, heating stand; 110, driving motor; 120, transmission housing; 130, swivel bearing slip ring; 200, motion drive assembly; 210, protective sleeve seat; 220, rotating sleeve seat; 230, rotor stack ring; 221, transmission gear ring; 300, electromagnetic assembly; 310, adjustment seat; 320, movable slide seat; 330, electromagnet; 340, electromagnetic control board; 311, casing. DETAILED DESCRIPTION

[0019] To make the purpose, technical solution and advantages of the present invention more clear, the present invention is further described in detail below in combination with specific implementations and with reference to the accompanying drawings. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0020] A pumping rod heating device applied to an oil field wellhead provided by some embodiments of the present invention will be described below in conjunction with the accompanying drawings.

[0021] Combination Figure 1-6 As shown, the present invention provides a sucker rod heating device for oilfield wellhead, comprising: a heating stand 100, a motion drive assembly 200 and an electromagnetic assembly 300, wherein a transmission sleeve 120 is fixedly installed on the top of the heating stand 100, the motion drive assembly 200 is fixedly installed on the bottom surface of the transmission sleeve 120, a slewing bearing slip ring 130 is fixedly installed on the surface of the heating stand 100, the motion drive assembly 200 comprises a protective sleeve seat 210, a rotating sleeve seat 220 and a plurality of rotor stacking rings 230 fixedly installed on the inner side of the rotating sleeve seat 220, the rotating sleeve seat 220 is rotatably installed on the inner side of the protective sleeve seat 210 and a transmission gear ring 221 is provided on the surface of the rotating sleeve seat 220, a driving motor 110 is fixedly installed on the top surface of the transmission sleeve 120, and the output end of the driving motor 110 is transmission-connected to the surface of the transmission gear ring 221, the number of the electromagnetic assemblies 300 is several and evenly divided into several groups, and each group of electromagnetic assemblies 300 is evenly distributed on the surface of each rotor stacking ring 230 in the circumferential direction; The electromagnetic assembly 300 includes an adjustment seat 310, a movable slide seat 320, an electromagnet 330 and an electromagnetic control board 340. The electromagnet 330 and the electromagnetic control board 340 are fixedly installed on the surface of the movable slide seat 320. The adjustment seat 310 is radially fixed on the surface of the rotor stack ring 230. The input end of the electromagnetic control board 340 is electrically connected to the current generator, and the output end of the electromagnetic control board 340 is electrically connected to the electrode of the electromagnet 330. The electromagnetic control board 340 is used to convert the input current into an alternating current of different frequencies.

[0022] In this embodiment, the surfaces of the transmission housing 120 , the protective housing seat 210 , the swivel housing seat 220 and the swivel bearing slip ring 130 are provided with holes for the sucker rod to pass through, and the bottom end of the swivel housing seat 220 is provided with a pipe head that is sleeved on the inner side of the swivel bearing slip ring 130 .

[0023] Specifically, the transmission sleeve box 120, the protective sleeve seat 210, the rotating sleeve seat 220 and the rotating bearing sliding ring 130 are sleeved on the outside of the sucker rod to perform the sucker rod heating work.

[0024] In this embodiment, a plurality of rotor stack rings 230 are stacked and arranged on the inner side of the rotating sleeve 220 , and the outer periphery of the rotor stack rings 230 abuts against the inner wall of the rotating sleeve 220 , and the electromagnetic assembly 300 is located between adjacent rotor stack rings 230 .

[0025] In this embodiment, a casing 311 is fixedly mounted on the surface of the adjustment seat 310 . The casing 311 is a metal or ceramic component used for rapid heat dissipation of the electromagnet 330 and the electromagnetic control board 340 .

[0026] In this embodiment, an electric slip ring is provided on the inner side of the transfer slip ring 130, and the input end of the electric slip ring is connected to the current generator point fixed on the surface of the heating stand 100. An electrode ring group connected to the electromagnetic control board 340 is provided on the surface of the sleeve at the bottom end of the rotating sleeve seat 220.

[0027] Specifically, the swivel bearing slip ring 130 and the bottom sleeve of the swivel sleeve seat 220 are used to realize the point connection of the electromagnetic assembly 300 in the moving state.

[0028] In this embodiment, the movable slide 320 is slidably mounted on the surface of the adjustment seat 310 and a screw for locking the position of the movable slide 320 is provided on the surface of the adjustment seat 310. The adjustment seat 310 and the electromagnet 330 are arranged in a radial direction.

[0029] Specifically, the movable slide 320 can be used to slide and adjust the position of the electromagnet 330 to adapt to sucker rods of different diameters.

[0030] In this embodiment, the electromagnet 330 includes an electromagnetic coil and an iron core structure located inside the electromagnetic coil, and the electromagnet 330 is an electromagnet structure.

[0031] Furthermore, the electromagnetic control board 340 is a PCB board structure, and an electromagnetic relay, an electromagnetic lock, and an electromagnetic valve are provided on the surface of the electromagnetic control board 340. The electromagnetic control board 340 adjusts the strength of the magnetic field by controlling the current passing into the electromagnet 330, thereby controlling the working state of the electromagnet 330.

[0032] Specifically, the electromagnetic control board 340 generates an alternating current to make the electromagnet 330 generate a changing magnetic field, and the rotating sleeve 220 rotates a plurality of electromagnetic assemblies 300 to perform a rotational motion to form an efficient heating effect on the surface of the sucker rod.

[0033] The working principle and use process of the present invention: When the oilfield wellhead sucker rod heating device is used, the sucker rod is vertically penetrated by the transmission sleeve box 120, the motion drive assembly 200 and the top of the transfer bearing slip ring 130 and sent into the pumping well. The arrangement height of the motion drive assembly 200 can be adjusted by the heating stand 100, and the power supply of the electromagnetic assembly 300 is turned on. Under the drive of the drive motor 110, the rotating sleeve seat 220, the rotor stack ring 230 and the electromagnetic assembly 300 are driven by the transmission gear ring 221 to rotate inside the protective sleeve seat 210, and are sleeved on the outer periphery of the sucker rod for orbital motion. Synchronously, the electromagnetic control board 340 inputs an alternating current value into the electromagnet 330. The electromagnet 330 is composed of a wire wound into a circle or a spiral. This wire forms a structure called a coil. When current passes through the coil of the electromagnet, the coil generates a magnetic field. According to Ampere's loop theorem, the magnetic field formed by the current will form a closed magnetic flux path. The strength of the magnetic field generated by the electromagnet is proportional to the current passing through the coil, that is, the larger the current, the stronger the magnetic field. Due to the relative movement of the sucker rod surface in the rotating counter-field of the magnetic field, when the sucker rod, as a conductor, is in a changing magnetic field, an induced current will be generated inside the conductor according to Faraday's law of electromagnetic induction. This induced current will produce resistance loss inside the conductor, causing the conductor to heat up, thereby heating the sucker rod body without the need for heat conduction, thereby improving energy utilization. In some cases, moving magnetic field heating can respond to low-frequency magnetic fields. Compared with eddy current heating, the alternating magnetic field current is smaller and safer, and a continuous and stable constant temperature and low temperature are maintained on the surface of the sucker rod, which is more suitable for wellbore heating effects.

[0034] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A pumping rod heating device applied to an oil field wellhead, characterized in that: include: A heating stand (100), a motion drive assembly (200) and an electromagnetic assembly (300), wherein a transmission sleeve (120) is fixedly mounted on the top of the heating stand (100), the motion drive assembly (200) is fixedly mounted on the bottom surface of the transmission sleeve (120), a rotation bearing slip ring (130) is fixedly mounted on the surface of the heating stand (100), and the motion drive assembly (200) comprises a protective sleeve seat (210), a rotation sleeve seat (220) and a plurality of rotor stacking rings fixedly mounted on the inner side of the rotation sleeve seat (220). (230), the rotating sleeve seat (220) is rotatably mounted on the inner side of the protective sleeve seat (210), and a transmission gear ring (221) is provided on the surface of the rotating sleeve seat (220), a driving motor (110) is fixedly mounted on the top surface of the transmission sleeve box (120), and the output end of the driving motor (110) is in transmission connection with the surface of the transmission gear ring (221), the number of the electromagnetic components (300) is a plurality and they are evenly divided into a plurality of groups, and each group of electromagnetic components (300) is evenly distributed on the surface of each rotor stack ring (230) in a circumferential direction; The electromagnetic assembly (300) comprises an adjustment seat (310), a movable slide seat (320), an electromagnet (330) and an electromagnetic control board (340); the electromagnet (330) and the electromagnetic control board (340) are fixedly mounted on the surface of the movable slide seat (320); the adjustment seat (310) is radially fixed to the surface of the rotor stack ring (230); the input end of the electromagnetic control board (340) is electrically connected to a current generator; the output end of the electromagnetic control board (340) is electrically connected to an electrode of the electromagnet (330); and the electromagnetic control board (340) is used to convert input current into alternating current of different frequencies.

2. The sucker rod heating device used in an oil field wellhead according to claim 1, characterized in that: The surfaces of the transmission sleeve box (120), the protective sleeve seat (210), the rotating sleeve seat (220) and the rotating bearing slip ring (130) are provided with sleeve holes for the pumping rod to pass through, and the bottom end of the rotating sleeve seat (220) is provided with a pipe head sleeved on the inner side of the rotating bearing slip ring (130).

3. The sucker rod heating device used in an oil field wellhead according to claim 1, characterized in that: A plurality of the rotor stack rings (230) are stacked and arranged on the inner side of the rotating sleeve seat (220), and the outer periphery of the rotor stack rings (230) and the inner wall of the rotating sleeve seat (220) are in contact with each other, and the electromagnetic assembly (300) is located between adjacent rotor stack rings (230).

4. The sucker rod heating device used in an oil field wellhead according to claim 1, characterized in that: A casing (311) is fixedly mounted on the surface of the adjustment seat (310); the casing (311) is a metal or ceramic material component used for rapid heat dissipation of the electromagnet (330) and the electromagnetic control board (340).

5. The sucker rod heating device used in an oil field wellhead according to claim 1, characterized in that: An electric connection slip ring is provided on the inner side of the transfer bearing slip ring (130), and the input end of the electric connection slip ring is point-connected to a current generator fixed to the surface of the heating stand (100). An electrode ring group connected to the electromagnetic control board (340) is provided on the surface of the sleeve at the bottom end of the transfer sleeve seat (220).

6. The sucker rod heating device used in an oil field wellhead according to claim 1, characterized in that: The movable sliding seat (320) is slidably mounted on the surface of the adjusting seat (310), and a screw rod for locking the position of the movable sliding seat (320) is provided on the surface of the adjusting seat (310). The adjusting seat (310) and the electromagnet (330) are arranged in a radial direction.

7. The sucker rod heating device used in an oil field wellhead according to claim 1, characterized in that: The electromagnet (330) comprises an electromagnetic coil and an iron core structure located inside the electromagnetic coil; the electromagnet (330) is an electromagnet structure.

8. The sucker rod heating device used in an oil field wellhead according to claim 1, characterized in that: The electromagnetic control board (340) is a PCB board structure. An electromagnetic relay, an electromagnetic lock, and an electromagnetic valve are provided on the surface of the electromagnetic control board (340). The electromagnetic control board (340) adjusts the intensity of the magnetic field by controlling the current passed into the electromagnet (330), thereby controlling the working state of the electromagnet (330).

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