Oil pumping well liquid-out-failure alarm device and method based on thermoelectric power generation

Abstract

The device comprises a base, a gland, a temperature difference induction mechanism and an alarm mechanism, a cavity is formed in the base, the temperature difference induction mechanism is arranged in the cavity, the base and the gland are coaxial, through holes are formed in the centers of the base and the gland, and the temperature difference induction mechanism is electrically connected with the alarm mechanism. The temperature difference sensing mechanism comprises a heat conduction metal ring and a temperature difference power generation piece, an inner ring of the heat conduction metal ring coincides with the through hole, the temperature difference power generation piece is arranged on an outer ring, tightly attached to the heat conduction metal ring, of the heat conduction metal ring and connected with an alarm circuit of the alarm device, and the alarm circuit is electrically connected with the alarm mechanism. According to the method, the temperature difference power generation principle is utilized, when the rod-pumped well does not discharge liquid, an alarm signal can be sent out at the first time, the manual screening workload is greatly reduced, first-level working conditions such as oil well rod breakage, oil pipe leakage, standing valve failure, traveling valve failure and double-valve failure are found in time, repair is arranged in time, and the yield influence is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical production technology for oil pumping wells, and in particular relates to a device and method for alarming oil pumping wells for failure to produce liquid based on temperature difference power generation. Background Art

[0002] At present, domestic and foreign oil fields mainly use pumping units for oil production. The mechanical production system based on pumping wells is mainly composed of pumping units, sucker rods, oil pumps, oil pipes, casing and other components. When the pumping well does not produce liquid, it mainly manifests the following working conditions: first, formation energy deficit and insufficient liquid supply; second, the sucker rod is broken; third, the fixed valve fails; fourth, the floating valve fails; fifth, the double valve fails; sixth, the oil pipe leaks.

[0003] There are two main methods for conventionally detecting the above working conditions. One is the manual identification method, which is that the staff touches the light rod to see if it is hot. If it is hot, it means that there is no liquid, or if the wellhead is under pressure, it also means that there is no liquid. This method has a huge workload and cannot achieve efficient control of the pumping well; the other is the work condition diagnosis method of the power diagram method. This method mainly collects the power diagram of the pumping well by installing load and displacement sensors, and then uses the working condition diagnosis algorithm to realize the diagnosis of the above-mentioned no liquid working condition. In the prior art, the power diagram can directly diagnose the working condition. Therefore, the diagnosis and optimization methods based on the power diagram are relatively mature, but the power diagram tester has some disadvantages, such as: high investment cost, easy drift distortion caused by the power diagram tester being installed on the light rod for a long time and bearing the mechanical alternating load, and high calibration and maintenance costs. These disadvantages will affect the large-scale application of the Internet of Things for oil wells. On October 4, 2022, the State Intellectual Property Office disclosed an intelligent analysis method and device for oil pumping wells, the method comprising collecting electrical parameter curves of the oil pumping wells; performing frequency domain transformation on the collected electrical parameter curves to obtain the frequency spectrum characteristics of the electrical parameter curves; and calculating the operating condition information of the oil pumping wells using the operating condition diagnosis model according to the frequency spectrum characteristics of the electrical parameter curves. This method is very efficient, but it mainly has the problems of high investment costs and a high degree of dependence on the intelligence of the algorithm, and missed or misdiagnosed non-liquid conditions often occur. In view of the above-mentioned production status, it is urgent to develop a low-cost and efficient non-liquid condition diagnosis device to solve the current difficulties in oil field production. Summary of the invention

[0004] The purpose of the present invention is to provide a pumping well liquid failure alarm device based on temperature difference power generation to overcome the above technical problems existing in the prior art.

[0005] Another object of the present invention is to provide a method for alarming a pumping well that does not produce fluid based on temperature difference power generation, which greatly improves the efficiency of identifying a no-fluid condition.

[0006] To this end, the technical solution provided by the present invention is as follows: A fluid-not-coming-out alarm device for a pumping well based on temperature difference power generation comprises a base, a gland, a temperature difference sensing mechanism and an alarm mechanism. A cavity is provided in the base, and the temperature difference sensing mechanism is arranged in the cavity. The base and the gland are coaxial and have through holes in their centers. The temperature difference sensing mechanism is electrically connected to the alarm mechanism. The temperature difference sensing mechanism includes a heat-conducting metal ring and a temperature difference power generation sheet. The inner ring of the heat-conducting metal ring coincides with the through hole. The temperature difference power generation sheet is arranged on the outer ring of the heat-conducting metal ring close to the heat-conducting metal ring. The temperature difference power generation sheet is connected to the alarm circuit of the alarm device, and the alarm circuit is electrically connected to the alarm mechanism.

[0007] The alarm mechanism includes an alarm circuit and an alarm, wherein the alarm circuit is at least used to supply power to the alarm, and the alarm includes an audible and visual alarm, a sound alarm, a light alarm or a radio alarm.

[0008] The base is cylindrical, the cavity is coaxial with the through hole, and the base is provided with a heat-conducting metal ring mounting screw hole, a first sealing groove, a pressure cover sealing groove and a pressure cover mounting screw hole one in sequence from the through hole outward. The heat-conducting metal ring mounting screw hole and the first sealing groove are both provided on the cavity, and the pressure cover sealing groove and the pressure cover mounting screw hole one are both provided on the top of the base.

[0009] The gland is circular, and is provided with a gland installation through hole 1, a second sealing groove and a gland installation through hole 2 in sequence from the outside to the inside. The gland installation through hole 1 corresponds to the gland installation screw hole one by one.

[0010] The thermally conductive metal ring is provided with a thermally conductive metal ring mounting screw through hole and two pressure cover mounting screw holes. The thermally conductive metal ring mounting screw through hole and the two pressure cover mounting screw holes are evenly spaced along the circumference of the thermally conductive metal ring, and the two pressure cover mounting through holes correspond one to one with the two pressure cover mounting screw holes.

[0011] The radio alarm comprises a transmitting antenna and a signal receiving device, the transmitting antenna and the signal receiving device are connected via a signal, and the signal receiving device is installed in a control room.

[0012] The inner ring of the heat-conducting metal ring is provided with threads.

[0013] A method for alarming a pumping well for failure to produce liquid based on temperature difference power generation, wherein a pumping well for failure to produce liquid alarm device based on temperature difference power generation is installed on the top of the bare rod of the pumping well. When the oil well fails to produce liquid, the temperature of the pumping rod gradually increases due to dry grinding and empty pumping. The pumping rod transfers heat to a heat-conducting metal ring, so that one side of a thermoelectric power generation sheet is heated while the other side is not heated, thereby forming a temperature difference. When the temperature difference between the two sides exceeds a set value, the thermoelectric power generation sheet generates a voltage, which supplies power to an alarm mechanism to realize an alarm.

[0014] The beneficial effects of the present invention are: The oil pumping well no-liquid alarm device based on temperature difference power generation provided by the present invention can be installed on the top of the polished rod through the coaxial through-holes of the base and the gland and the threads of the inner ring of the heat-conducting metal ring. Then, with the cooperation of the sealing ring, the heat caused by the dry grinding and empty pumping of the polished rod without liquid is quickly transferred to the heat-conducting metal ring, causing one side of the temperature difference power generation sheet to be heated while the other side is not heated, forming a large temperature difference. When the temperature difference between the two sides exceeds a certain value, the temperature difference power generation sheet generates a voltage. The voltage supplies power to the alarm mechanism, and an alarm signal is sent to realize the alarm.

[0015] The method of the present invention utilizes the principle of temperature difference power generation. When the oil pumping well fails to produce liquid, an alarm signal can be issued immediately, which greatly reduces the workload of manual screening and promptly discovers primary working conditions such as oil well rod breakage, oil pipe leakage, fixed valve failure, floating valve failure, double valve failure, etc., and promptly arranges for repairs to reduce the impact on production. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic structural diagram of an implementation method of the base of the present invention; Figure 2 This is a schematic structural diagram of an implementation scheme of a heat-conducting metal ring of the present invention; Figure 3 This is a schematic structural diagram of an implementation scheme of the thermoelectric power generation sheet of the present invention; Figure 4 This is a schematic structural diagram of an implementation scheme of the gland of the present invention; Figure 5 It is a schematic diagram of an overall assembly structure of the present invention.

[0017] In the figure: 1. base; 2. cavity; 3. first sealing groove; 4. gland sealing groove; 5. antenna mounting screw hole; 6. thermal conductive metal ring mounting screw hole; 7. gland mounting screw hole 1; 8. thermal conductive metal ring; 9. thermal conductive metal ring mounting screw through hole; 10. gland mounting screw hole 2; 11. transmitting antenna; 12. temperature difference power generation sheet; 13. gland; 14. second sealing groove; 15. gland mounting through hole 2; 16. gland mounting through hole 1; 17. first sealing ring; 18. alarm circuit. DETAILED DESCRIPTION

[0018] The following describes the implementation of the present invention through specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0019] The exemplary embodiments of the present invention are now described with reference to the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to disclose the present invention in detail and completely and to fully convey the scope of the present invention to those skilled in the art. The terms used in the exemplary embodiments shown in the accompanying drawings are not intended to limit the present invention. In the accompanying drawings, the same units / elements are marked with the same reference numerals.

[0020] Unless otherwise specified, the terms (including technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it is understood that the terms defined in commonly used dictionaries should be understood to have the same meanings as those in the context of the relevant fields, and should not be understood as idealized or overly formal meanings.

[0021] Example 1 The present embodiment provides a fluid-not-coming-out alarm device for a pumping well based on temperature difference power generation, comprising a base 1, a pressure cover 13, a temperature difference sensing mechanism and an alarm mechanism. A cavity 2 is provided in the base 1, and the temperature difference sensing mechanism is provided in the cavity 2. The base 1 and the pressure cover 13 are coaxial and have through holes in the center. The temperature difference sensing mechanism is electrically connected to the alarm mechanism. When in use, the alarm device is installed on the top of the bare rod of the pumping well through the through hole. When the pumping well does not produce liquid, the temperature of the pumping rod rises, and the temperature is transmitted to the temperature difference sensing mechanism to generate voltage, which supplies power to the alarm mechanism to realize the alarm.

[0022] Example 2 On the basis of Example 1, this embodiment provides a pumping well liquid failure alarm device based on temperature difference power generation, wherein the temperature difference sensing mechanism includes a heat-conducting metal ring 8 and a temperature difference power generation sheet 12, wherein the inner ring of the heat-conducting metal ring 8 coincides with the through hole, and the temperature difference power generation sheet 12 is arranged on the heat-conducting metal ring 8 close to the outer ring of the heat-conducting metal ring 8, and the temperature difference power generation sheet 12 is connected to the alarm circuit 18 of the alarm device, and the alarm circuit 18 is electrically connected to the alarm mechanism.

[0023] Working principle: When the pumping well does not produce fluid, the sucker rod will experience dry grinding and empty pumping. As time goes by, the temperature of the sucker rod gradually increases. At this time, the sucker rod transfers heat to the heat-conducting metal ring 8, and one side of the temperature difference power generation sheet 12 is heated, while the other side is not heated, forming a large temperature difference. When the temperature difference between the two sides exceeds a certain value, the temperature difference power generation sheet 12 generates a voltage, which supplies power to the alarm mechanism, sending out an alarm signal to realize the alarm.

[0024] Example 3 Based on Example 1, this embodiment provides a pumping well liquid failure alarm device based on temperature difference power generation, the alarm mechanism includes an alarm circuit 18 and an alarm, the alarm circuit 18 is at least used to power the alarm, and the alarm includes an audible and visual alarm, a sound alarm, a light alarm or a radio alarm.

[0025] The alarm circuit 18 processes power supply to the alarm and also includes receiving and sending signals. When the temperature difference sensing mechanism is a temperature sensor installed on the light pole, the alarm circuit 18 receives and monitors the temperature data of the temperature sensor in real time. When the temperature of the light pole exceeds the set value, the alarm circuit 18 sends a signal to the alarm to realize the alarm.

[0026] Example 4 Based on Example 2, this embodiment provides a pumping well non-liquid alarm device based on temperature difference power generation, such as Figure 1 As shown, the base 1 is cylindrical, the cavity 2 is coaxial with the through hole, and the base 1 is provided with a heat-conducting metal ring mounting screw hole 6, a first sealing groove 3, a pressure cover 13 sealing groove 4 and a pressure cover mounting screw hole 7 in sequence from the through hole to the outside, the heat-conducting metal ring mounting screw hole 6 and the first sealing groove 3 are both opened on the cavity 2, and the pressure cover 13 sealing groove 4 and the pressure cover mounting screw hole 7 are both opened on the top of the base 1.

[0027] The base 1 is made of non-heat-conducting material. The heat-conducting metal ring 8 is installed in the cavity 2 of the base 1. First, the first sealing ring is placed in the first sealing groove 3 of the base 1; secondly, the heat-conducting metal ring 8 is placed on the first sealing ring 17 and aligned with the heat-conducting metal ring mounting screw hole 6; finally, a screw is passed through the heat-conducting metal ring 8 and tightened on the heat-conducting metal ring mounting screw hole 6.

[0028] Example 5 Based on Example 4, this embodiment provides a pumping well non-liquid alarm device based on temperature difference power generation, such as Figure 4 As shown, the gland 13 is circular, and is provided with a gland mounting through hole 16, a second sealing groove 14 and a gland mounting through hole 2 15 in sequence from the outside to the inside. The gland mounting through hole 16 corresponds to the gland mounting screw hole 17 one by one.

[0029] The gland 13 is made of a non-heat-conducting material. During installation, firstly, the second sealing ring is placed in the second sealing groove 14 of the gland 13, and the sealing ring of the gland 13 is placed in the sealing groove 4 of the gland 13 of the base 1; secondly, the gland 13 is installed just above the base 1 and the heat-conducting metal ring 8, and the gland installation through hole 16 is aligned with the gland installation screw hole 17 one by one; finally, the installation screw is passed through the gland installation through hole 16 of the gland 13, and is screwed and installed on the gland installation screw hole 17 of the base 1.

[0030] Example 6 Based on Example 4, this embodiment provides a pumping well non-liquid alarm device based on temperature difference power generation, such as Figure 2 As shown, the thermally conductive metal ring 8 is provided with a thermally conductive metal ring mounting screw through hole 9 and a second pressure cover mounting screw hole 10. The thermally conductive metal ring mounting screw through hole 9 and the second pressure cover mounting screw hole 10 are evenly spaced along the circumference of the thermally conductive metal ring 8, and the second pressure cover mounting through hole 15 corresponds one to one with the second pressure cover mounting screw hole 10.

[0031] After the mounting screws pass through the gland mounting through holes 16 (8) of the gland 13 and are screwed on the gland mounting screw holes 7 (8) of the base 1, the mounting screws pass through the four gland mounting through holes 2 15 of the gland 13 and are screwed on the four gland mounting screw holes 2 10 of the heat conductive metal ring 8. Figure 5 shown.

[0032] Example 7 Based on Example 3, this embodiment provides a pumping well liquid failure alarm device based on temperature difference power generation, the radio alarm includes a transmitting antenna 11 and a signal receiving device, the transmitting antenna 11 and the signal receiving device are connected through a signal, and the signal receiving device is installed in the control room.

[0033] like Figure 1 As shown, the transmitting antenna 11 is provided with threads and is screwed on the transmitting antenna 11 mounting screw hole 5 of the base 1. The alarm circuit 18 is installed in the cavity 2 of the device base 1, and the temperature difference power generation sheet 12 is connected to the alarm circuit 18 line to realize the power supply function; the transmitting antenna 11 is connected to the alarm circuit 18 line to realize the wireless transmission of the alarm signal. The inner ring of the heat conductive metal ring 8 is provided with threads, the purpose is to facilitate the installation of the device on the top of the polished rod of the pumping well.

[0034] Thermoelectric power generation sheet 12 Figure 3 As shown, the temperature difference power generation sheet 12 is placed in the cavity 2 of the device base 1 and is closely attached to the thermal conductive metal ring 8 .

[0035] In this embodiment, the thermoelectric power generation sheet 12 is made of PbTe-SnTe alloy doped with Au elements, which has good ductility and thermoelectric performance, and can generate electricity at a small temperature difference of 15 degrees Celsius. The power generation power reaches 0.084W, which can just trigger the alarm device to alarm. The temperature difference and voltage are shown in Table 1.

[0036] Table 1 Temperature difference and voltage Example 8 The present embodiment provides a method for alarming a pumping well for a lack of fluid based on temperature difference power generation. When the oil well does not produce fluid, the temperature of the sucker rod during dry grinding and pumping gradually increases, and the sucker rod transfers the heat to the heat-conducting metal ring 8, so that one side of the thermoelectric power generation sheet 12 is heated while the other side is not heated, thereby forming a temperature difference. When the temperature difference between the two sides exceeds a set value, the thermoelectric power generation sheet 12 generates a voltage, which supplies power to the alarm mechanism to realize an alarm.

[0037] The present invention adopts the principle of temperature difference power generation. When the oil pumping well fails to produce liquid, it can send out an alarm signal in the first time, greatly reducing the workload of manual screening, and promptly discovering primary working conditions such as oil well rod breakage, oil pipe leakage, fixed valve failure, floating valve failure, double valve failure, etc., and arrange for repairs in time to reduce the impact on production.

[0038] The above examples are merely illustrative of the present invention and do not constitute a limitation on the protection scope of the present invention. All designs that are the same or similar to the present invention fall within the protection scope of the present invention.

Claims

1. A pumping well no-liquid alarm device based on temperature difference power generation, characterized in that: It includes a base, a pressure cover, a temperature difference sensing mechanism and an alarm mechanism. The base is provided with a cavity, the temperature difference sensing mechanism is arranged in the cavity, the base and the pressure cover are coaxial and both have through holes in the center, and the temperature difference sensing mechanism is electrically connected to the alarm mechanism.

2. The device for alarming a pumping well for not producing liquid based on temperature difference power generation according to claim 1, characterized in that: The temperature difference sensing mechanism includes a heat-conducting metal ring and a temperature difference power generation sheet. The inner ring of the heat-conducting metal ring coincides with the through hole. The temperature difference power generation sheet is arranged on the outer ring of the heat-conducting metal ring close to the heat-conducting metal ring. The temperature difference power generation sheet is connected to the alarm circuit of the alarm device, and the alarm circuit is electrically connected to the alarm mechanism.

3. The device for alarming a pumping well for not producing liquid based on temperature difference power generation according to claim 1 is characterized in that: The alarm mechanism includes an alarm circuit and an alarm, wherein the alarm circuit is at least used to supply power to the alarm, and the alarm includes an audible and visual alarm, a sound alarm, a light alarm or a radio alarm.

4. The device for alarming a pumping well for not producing liquid based on temperature difference power generation according to claim 2, characterized in that: The base is cylindrical, the cavity is coaxial with the through hole, and the base is provided with a heat-conducting metal ring mounting screw hole, a first sealing groove, a pressure cover sealing groove and a pressure cover mounting screw hole one in sequence from the through hole outward. The heat-conducting metal ring mounting screw hole and the first sealing groove are both provided on the cavity, and the pressure cover sealing groove and the pressure cover mounting screw hole one are both provided on the top of the base.

5. The device for alarming a pumping well for lack of liquid based on temperature difference power generation according to claim 4, characterized in that: The gland is circular, and is provided with a gland installation through hole 1, a second sealing groove and a gland installation through hole 2 in sequence from the outside to the inside. The gland installation through hole 1 corresponds to the gland installation screw hole one by one.

6. The device for alarming a pumping well for not producing fluid based on temperature difference power generation according to claim 4, characterized in that: The thermally conductive metal ring is provided with a thermally conductive metal ring mounting screw through hole and two pressure cover mounting screw holes. The thermally conductive metal ring mounting screw through hole and the two pressure cover mounting screw holes are evenly spaced along the circumference of the thermally conductive metal ring, and the two pressure cover mounting through holes correspond one to one with the two pressure cover mounting screw holes.

7. The device for alarming a pumping well for lack of liquid based on temperature difference power generation according to claim 3 is characterized by: The radio alarm comprises a transmitting antenna and a signal receiving device, the transmitting antenna and the signal receiving device are connected via a signal, and the signal receiving device is installed in a control room.

8. The device for alarming a pumping well for lack of liquid based on temperature difference power generation according to any one of claims 4 to 6, characterized in that: The inner ring of the heat-conducting metal ring is provided with threads.

9. A method for alarming a pumping well for lack of fluid based on temperature difference power generation, characterized in that: The oil pumping well no liquid alarm device based on temperature difference power generation as described in any one of claims 1 to 7 is installed on the top of the bare rod of the oil pumping well. When the oil pumping well does not produce liquid, the temperature of the sucker rod gradually increases during dry grinding and empty pumping. The sucker rod transfers heat to the heat-conducting metal ring, so that one side of the thermoelectric power generation sheet is heated while the other side is not heated, forming a temperature difference. When the temperature difference between the two sides exceeds the set value, the thermoelectric power generation sheet generates a voltage, which supplies power to the alarm mechanism to realize the alarm.

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