A fully automated hot skid washing operation control method and system

Abstract

The present invention relates to the field of oil production technology, specifically a fully automated hot skid washing operation control method and system, which analyzes stress data of oil pumping equipment, determines whether the oil pumping equipment is overloaded, identifies the oil well where the overloaded oil pumping equipment is located by imaging, obtains spatial change information of well fluid flow, estimates waxing state information inside the oil well, and thereby implements soft start of the rotary jet pump performing the hot skid washing operation; analyzes the water output state data of the oil well, determines the waxing residual state information of the oil well, and thereby adjusts the hot water input state and / or hot water pumping state of the rotary jet pump; analyzes the current data inside the oil well, determines whether the skid washing operation meets the termination conditions, and adjusts the soft stop operation state of the rotary jet pump based on the real-time operation state of the rotary jet pump. The present invention can reduce the manual operation workload of the hot skid washing operation and improve the automation and safety of the hot skid washing operation.

Description

[Technical field]

[0001] The invention relates to the field of oil production technology, and in particular to a fully automated hot skid washing operation control method and system. [Background technology]

[0002] Wax deposition in oil wells is an inevitable problem in the process of oil extraction. Wax will form inside the pumping equipment, especially on the sucker rod, blocking the internal space of the oil well and reducing the flow space of the well fluid inside the oil well. If the wax deposition inside the oil well is not removed in time, it will cause greater stress deformation on the sucker rod, resulting in excessive workload of the pumping equipment, affecting the normal operation of the pumping equipment and the oil well production.

[0003] In order to reduce the adverse effects of wax deposition in oil wells, it is necessary to regularly perform hot washing and wax removal operations on oil wells (i.e., hot skid washing operations). Existing hot skid washing and wax removal operations usually use special equipment such as high-pressure plunger pumps to squeeze the well washing liquid into the oil well at high pressure, forming a high-temperature environment inside the oil well for a short period of time, melting the wax deposited in the well, and then using pressure circulation to bring out the melted waxy well washing liquid, thereby completing the hot washing and wax removal of the oil well. The high-pressure plunger pumps used in existing hot skid washing and wax removal operations have the disadvantages of large size, strong vibration, high oil consumption, and high failure rate, as well as low integration, complex operation, and low work efficiency. The flow regulating valve of the high-pressure pipeline on the outlet side of the high-pressure plunger pump needs to be manually adjusted, increasing the risk of high-pressure liquid injuring people. It can be seen that how to reduce manual operations in the hot skid washing process and centrally control the equipment used in the hot skid washing operation is of great significance to improving the automation and safety of the hot skid washing operation. [Summary of the invention]

[0004] In order to reduce the manual operation workload of hot skid washing operations, reduce the labor intensity of operations, avoid personnel exposure to high-pressure operating environments, reduce safety hazards of hot skid washing operations, and improve the automation and safety of hot skid washing operations, the present invention provides a fully automated hot skid washing operation control method, the method comprising the following steps:

[0005] Analyze the stress data inside the oil pumping equipment to determine whether the oil pumping equipment is in an overload state; when the oil pumping equipment is in an overload state, image and identify the oil well where the oil pumping equipment is located to obtain spatial variation information of the well fluid flow inside the oil well, thereby estimating the wax deposition state information inside the oil well;

[0006] Based on the wax deposition state information, a soft start is performed on the rotary jet pump that performs the hot skid washing operation; water output state data of the oil well is obtained after the rotary jet pump completes the soft start; the water output state data is analyzed to determine the residual state information of the wax deposition inside the oil well, thereby adjusting the hot water input state and / or hot water pumping state of the rotary jet pump;

[0007] The current data inside the oil well is collected, and the change of the current data is analyzed to obtain the current change characteristic information; based on the current change characteristic information, it is judged whether the hot wash skid operation meets the end condition; when the hot wash skid operation meets the end condition, the soft stop operation state of the rotary jet pump is adjusted based on the real-time operation state of the rotary jet pump.

[0008] Preferably, the stress data inside the oil pumping equipment is analyzed to determine whether the oil pumping equipment is in a working overload state; when the oil pumping equipment is in a working overload state, imaging and identifying the oil well where the oil pumping equipment is located is performed to obtain spatial variation information of the well fluid flow inside the oil well, thereby estimating the wax deposition state information inside the oil well, specifically:

[0009] Performing deformation detection on the sucker rod of the oil pumping equipment to obtain deformation amplitude data and deformation direction data of the sucker rod in several oil pumping action cycles; performing inversion processing on the deformation amplitude data and the deformation direction data to obtain stress data of the sucker rod in the several oil pumping action cycles;

[0010] Performing a time evolution analysis on the stress data to determine whether the pumping rod presents a stress increasing trend; if so, determining that the pumping equipment is in a working overload state; if not, determining that the pumping equipment is not in a working overload state;

[0011] When the oil pumping equipment is in an overloaded state, thermal imaging is performed on the oil well where the oil pumping equipment is located to obtain a global thermal infrared dynamic image of the oil well; frame recognition is performed on the global thermal infrared dynamic image to obtain liquid boundary contour information of all image frames contained in the global thermal infrared dynamic image; time evolution analysis is performed on the liquid boundary contour information of all image frames to obtain spatial volume change information of well fluid flow inside the oil well; based on the spatial volume change information of well fluid flow and the spatial volume information inside the oil well, the wax deposition status information inside the oil well is estimated; wherein the wax deposition status information includes the wax deposition volume and wax deposition position inside the oil well.

[0012] Preferably, based on the wax deposition state information, a soft start is performed on the rotary jet pump performing the hot skid washing operation, specifically:

[0013] Based on the wax deposition volume and wax deposition position inside the oil well contained in the wax deposition state information, determining the wax deposition strength distribution characteristic information inside the oil well; wherein the wax deposition mechanical strength characteristic information includes the mechanical strength distribution information of the wax deposition formed inside the oil well along the depth direction;

[0014] Based on the wax deposition intensity distribution characteristic information, the minimum output hot water pressure of the rotary jet pump when performing hot washing and skidding operations on the oil well is determined; based on the minimum output hot water pressure, the initial starting voltage for soft starting of the rotary jet pump is determined, thereby implementing soft starting of the rotary jet pump.

[0015] Preferably, the water output state data of the oil well is obtained after the rotary jet pump completes the soft start; the water output state data is analyzed to determine the residual state information of wax deposition inside the oil well, thereby adjusting the hot water input state and / or hot water pumping state of the rotary jet pump, specifically:

[0016] Acquire the outlet water temperature data and outlet water dynamic image of the oil well after the rotary jet pump completes soft start;

[0017] Performing a time evolution analysis on the outlet water temperature data to obtain the outlet water temperature change rate of the oil well; performing a color change analysis on the outlet water dynamic image to obtain the outlet water wax content change rate of the oil well; estimating the wax residue change information inside the oil well based on the outlet water temperature change rate and the outlet water wax content change rate, and using this as the wax residue state information inside the oil well;

[0018] Based on the information on the change in the amount of wax residue inside the oil well, determine whether the currently performed hot washing skid operation can clean and remove wax that exceeds a preset volume within a unit time; if not, increase the hot water flow or hot water temperature input to the rotary jet pump, and / or increase the pressure at which the rotary jet pump pumps hot water into the oil well.

[0019] Preferably, the current data inside the oil well is collected, and the change analysis of the current data is performed to obtain current change characteristic information; based on the current change characteristic information, it is judged whether the hot skid washing operation meets the end condition; when the hot skid washing operation meets the end condition, the soft stop operation state of the rotary jet pump is adjusted based on the real-time operation state of the rotary jet pump, specifically:

[0020] Collecting current data of several positions inside the oil well during the execution of the hot skid washing operation, performing time change analysis on the current data, and obtaining current change characteristic information inside the oil well; wherein the current change characteristic information includes information on the change of the current drop amplitude of each of the positions over time; based on the current change characteristic information, determining whether the current inside the oil well drops to a preset current threshold within a preset time range in the future; if so, judging that the hot skid washing operation meets the termination condition; if not, judging that the hot skid washing operation does not meet the termination condition;

[0021] When the hot scrubbing skid operation meets the termination condition, the pressure drop step length of the rotary jet pump for soft stopping is adjusted based on the real-time operating voltage information and the tolerable pressure drop information of the rotary jet pump.

[0022] In another aspect, the present invention provides a fully automated hot skid washing operation control system, the system comprising the following modules:

[0023] A stress change analysis module is used to analyze stress data inside the oil pumping equipment to determine whether the oil pumping equipment is in a working overload state;

[0024] The wax deposition state estimation module of the oil well is used to perform imaging recognition on the oil well where the oil pumping equipment is located when the oil pumping equipment is in a working overload state, obtain the spatial variation information of the well fluid flow inside the oil well, and estimate the wax deposition state information inside the oil well;

[0025] A soft start control module, used for soft starting the rotary jet pump performing the hot skid washing operation based on the wax deposition state information;

[0026] The rotary jet pump operation control module is used to obtain the water output state data of the oil well after the rotary jet pump completes the soft start; analyze the water output state data to determine the residual state information of the wax deposit inside the oil well, so as to adjust the hot water input state and / or hot water pumping state of the rotary jet pump;

[0027] A hot skid washing operation state judgment module is used to collect the current data inside the oil well, perform change analysis on the current data, and obtain current change characteristic information; based on the current change characteristic information, judge whether the hot skid washing operation meets the end condition;

[0028] The soft stop control module is used to adjust the soft stop operation state of the rotary spray pump based on the real-time operation state of the rotary spray pump when the hot washing skid operation meets the end condition.

[0029] Preferably, the stress change analysis module is used to analyze stress data inside the oil pumping equipment to determine whether the oil pumping equipment is in an overload state, specifically:

[0030] Performing deformation detection on the sucker rod of the oil pumping equipment to obtain deformation amplitude data and deformation direction data of the sucker rod in several oil pumping action cycles; performing inversion processing on the deformation amplitude data and the deformation direction data to obtain stress data of the sucker rod in the several oil pumping action cycles;

[0031] Performing a time evolution analysis on the stress data to determine whether the pumping rod presents a stress increasing trend; if so, determining that the pumping equipment is in a working overload state; if not, determining that the pumping equipment is not in a working overload state;

[0032] The oil well waxing state estimation module is used to perform imaging recognition on the oil well where the oil pumping equipment is located when the oil pumping equipment is in a working overload state, and obtain the spatial change information of the well fluid flow inside the oil well, so as to estimate the waxing state information inside the oil well, specifically:

[0033] When the oil pumping equipment is in an overloaded state, thermal imaging is performed on the oil well where the oil pumping equipment is located to obtain a global thermal infrared dynamic image of the oil well; frame recognition is performed on the global thermal infrared dynamic image to obtain liquid boundary contour information of all image frames contained in the global thermal infrared dynamic image; time evolution analysis is performed on the liquid boundary contour information of all image frames to obtain spatial volume change information of well fluid flow inside the oil well; based on the spatial volume change information of well fluid flow and the spatial volume information inside the oil well, the wax deposition status information inside the oil well is estimated; wherein the wax deposition status information includes the wax deposition volume and wax deposition position inside the oil well.

[0034] Preferably, the soft start control module is used to implement soft start on the rotary jet pump performing the hot skid washing operation based on the wax deposition state information, specifically:

[0035] Based on the wax deposition volume and wax deposition position inside the oil well contained in the wax deposition state information, determining the wax deposition strength distribution characteristic information inside the oil well; wherein the wax deposition mechanical strength characteristic information includes the mechanical strength distribution information of the wax deposition formed inside the oil well along the depth direction;

[0036] Based on the wax deposition intensity distribution characteristic information, the minimum output hot water pressure of the rotary jet pump when performing hot washing and skidding operations on the oil well is determined; based on the minimum output hot water pressure, the initial starting voltage for soft starting of the rotary jet pump is determined, thereby implementing soft starting of the rotary jet pump.

[0037] Preferably, the rotary jet pump operation control module is used to obtain the water output state data of the oil well after the rotary jet pump completes the soft start; analyze the water output state data to determine the residual state information of wax deposition inside the oil well, so as to adjust the hot water input state and / or hot water pumping state of the rotary jet pump, specifically:

[0038] Acquire the outlet water temperature data and outlet water dynamic image of the oil well after the rotary jet pump completes soft start;

[0039] Performing a time evolution analysis on the outlet water temperature data to obtain the outlet water temperature change rate of the oil well; performing a color change analysis on the outlet water dynamic image to obtain the outlet water wax content change rate of the oil well; estimating the wax residue change information inside the oil well based on the outlet water temperature change rate and the outlet water wax content change rate, and using this as the wax residue state information inside the oil well;

[0040] Based on the information on the change in the amount of wax residue inside the oil well, determine whether the currently performed hot washing skid operation can clean and remove wax that exceeds a preset volume within a unit time; if not, increase the hot water flow or hot water temperature input to the rotary jet pump, and / or increase the pressure at which the rotary jet pump pumps hot water into the oil well.

[0041] Preferably, the hot skid washing operation state judgment module is used to collect the current data inside the oil well, perform change analysis on the current data, and obtain current change characteristic information; based on the current change characteristic information, judge whether the hot skid washing operation meets the end condition, specifically:

[0042] Collecting current data of several positions inside the oil well during the execution of the hot skid washing operation, performing time change analysis on the current data, and obtaining current change characteristic information inside the oil well; wherein the current change characteristic information includes information on the change of the current drop amplitude of each of the positions over time; based on the current change characteristic information, determining whether the current inside the oil well drops to a preset current threshold within a preset time range in the future; if so, judging that the hot skid washing operation meets the termination condition; if not, judging that the hot skid washing operation does not meet the termination condition;

[0043] The soft stop control module is used to adjust the soft stop operation state of the rotary spray pump based on the real-time operation state of the rotary spray pump when the hot washing skid operation meets the end condition, specifically:

[0044] When the hot scrubbing skid operation meets the termination condition, the pressure drop step length of the rotary jet pump for soft stopping is adjusted based on the real-time operating voltage information and the tolerable pressure drop information of the rotary jet pump.

[0045] Compared with the prior art, the present invention has the following beneficial effects:

[0046] The stress data inside the pumping equipment is analyzed to determine whether the pumping equipment is in an overloaded state; when the pumping equipment is in an overloaded state, the oil well where the pumping equipment is located is imaged and identified to obtain the spatial change information of the well fluid flow inside the oil well, so as to estimate the waxing state information inside the oil well. Pumping equipment such as pumping units are installed on oil wells, and use their own sucker rods to penetrate into the oil wells, and realize up and down reciprocating motion under the drive of the pumping pump, so as to extract the well fluid inside the oil well. When wax is generated inside the oil well, the wax will adhere to the surface of the sucker rod, which will hinder the up and down reciprocating motion of the sucker rod. At the same time, the wax will also reduce the well fluid flow space inside the oil well, resulting in the inability to quickly and smoothly extract the well fluid. As the thickness of the wax on the surface of the sucker rod continues to increase, the obstruction force on the sucker rod also continues to increase, and the stress inside the sucker rod also continues to increase, thereby increasing the power output of the pumping pump to the sucker rod, making the pumping equipment prone to overload. During the oil production process, the wax deposition state of oil wells in different internal environments is different. In order to ensure the normal and stable operation of the oil pumping equipment, it is necessary to carry out hot skid washing in time before the wax deposition inside the oil well reaches the limit state. According to the above-mentioned influence of wax deposition on whether the oil pumping equipment is overloaded or not, by detecting and analyzing the stress data inside the oil pumping equipment, it is judged whether the oil pumping equipment is in a working overload state, which is used as the basis for starting the hot skid washing operation of the oil well to ensure timely and efficient hot washing and wax removal of the oil well. In addition, the location and degree of wax deposition inside the oil well are uncertain. The wax deposition thickness in some areas inside the oil well is large, and the wax deposition thickness in other areas is small. The hot skid washing operation uses high-temperature and high-strength liquid to flush and dissolve the wax deposition inside the oil well. The physical form of the wax deposition inside the oil well determines the operating parameters of the hot skid washing operation. If the temperature of the liquid squeezed into the oil well is not high enough and / or the liquid is not high enough, the wax deposition may not be peeled off and dissolved from the surface of the pumping rod, reducing the efficiency of hot washing and wax removal. In order to ensure that the wax deposition inside the oil well is completely removed in a short time, it is necessary to first identify the physical form of the wax deposition inside the oil well. Due to the geographical location of the oil well, it is impossible to directly survey the inside of the oil well. Accordingly, the oil well can be non-contacted by thermal imaging to obtain a global thermal infrared dynamic image of the oil well, and dynamically record the wax deposition inside the oil well. The wax deposition inside the oil well and the well fluid are two different substances, and the well fluid has fluidity. The infrared band properties such as infrared light absorption rate presented by the two in the thermal infrared image are not the same; by using the difference between wax deposition and well fluid in the infrared band, the physical form of wax deposition inside the oil well can be accurately distinguished and identified, providing an important and accurate basis for the subsequent adjustment of the operating parameters of the hot skid washing operation.

[0047] Based on the waxing state information, the rotary jet pump performing the hot skid washing operation is soft-started; the water output state data of the oil well after the rotary jet pump completes the soft start is obtained; the water output state data is analyzed to determine the residual state information of the waxing inside the oil well, so as to adjust the hot water input state and / or hot water pumping state of the rotary jet pump. In order to improve the action stability of the hot skid washing operation and reduce the oil consumption, a rotary jet pump with a smaller volume and electric drive is used to perform the hot skid washing operation. The rotary jet pump needs to apply a driving voltage during the startup process. In order to avoid interference and impact on the rotary jet pump by applying an excessive driving voltage in a short time, the rotary jet pump is controlled by a frequency converter to perform a soft start, so that the rotary jet pump can gradually switch to a stable working state along a smooth voltage change curve. Through the above analysis, it can be seen that only when the hot water pressure input by the rotary jet pump to the inside of the oil well is high enough, the input hot water can flush the wax; if the input hot water pressure is not high enough, the hot water will be blocked by the waxing and cannot penetrate into the oil well, which may cause liquid to overflow back to the rotary jet pump, affecting the normal operation of the rotary jet pump and even causing damage to the rotary jet pump. For this reason, during the soft start process of the rotary jet pump, it is necessary to ensure that the rotary jet pump can output hot water with a sufficiently high pressure during the soft start stage, so as to destroy the wax deposit structure inside the oil well, so that the hot water can be continuously injected into the deeper areas inside the oil well, effectively separating the wax deposit from the surface of the sucker rod, and avoiding the backflow of hot water to the rotary jet pump. To this end, based on the wax deposit volume and wax deposit position inside the oil well, the wax deposit strength distribution characteristic information inside the oil well is determined, and the mechanical strength of the wax deposit inside the oil well is accurately characterized, providing a basis for determining the minimum hot water pressure required to destroy the wax deposit structure. Based on the wax deposit strength distribution characteristic information, the initial starting voltage of the rotary jet pump soft start is determined, so that the rotary jet pump can form hot water with sufficient pressure during the soft start process, thereby improving the cleaning efficiency of the wax deposit.

[0048] In addition, during the hot washing and skidding operation inside the oil well, the wax inside the oil well is continuously dissolved and cleaned. The wax will dissolve in the hot water and output to the outside. The greater the concentration of wax dissolved in the hot water, the greater the temperature of the hot water will drop accordingly. At the same time, the color of the hot water itself will gradually deepen. After multiple hot washing and wax removal operations, the amount of wax inside the oil well will gradually decrease. The temperature drop of the hot water output after each hot washing and wax removal operation will gradually decrease, and the color of the hot water will not become darker. Through the above analysis, the residual amount of wax inside the oil well can be estimated based on the temperature and color of the hot water output after each hot washing and wax removal operation, so as to quantitatively determine whether the wax inside the oil well has been effectively cleaned. Based on the residual amount of wax inside the oil well, the hot water input state and / or hot water pumping state of the rotary jet pump are adaptively adjusted to ensure that the wax inside the oil well is thoroughly cleaned in a short time.

[0049] The current data inside the oil well is collected, and the current data is analyzed to obtain the current change characteristic information; based on the current change characteristic information, it is judged whether the hot washing skid operation meets the end conditions; when the hot washing skid operation meets the end conditions, the soft stop operation state of the rotary jet pump is adjusted based on the real-time operation state of the rotary jet pump. As the hot washing skid operation continues, the wax inside the oil well is gradually cleaned out, the obstruction force on the up and down reciprocating motion of the pumping rod inside the oil well gradually decreases, and the flow of well fluid inside the oil well becomes smooth and fast, so that the current inside the oil well will show a downward trend. By analyzing the current changes inside the oil well, it can be judged whether the inside of the oil well has been restored to the environmental state that meets the normal and stable operation of the pumping equipment, providing an accurate basis for judging whether to end the hot washing skid operation. When the hot washing skid operation needs to be ended, in order to avoid a sudden interruption of the driving voltage applied to the rotary jet pump to cause a large impact on the rotary jet pump, the frequency converter is used to control the rotary jet pump to soft stop, so that the rotary jet pump can gradually stop along the smooth voltage change curve to ensure the operation safety of the rotary jet pump.

Brief Description of the Drawings

[0050] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0051] Figure 1 The present invention provides a flow chart of a fully automated hot skid washing operation control method.

[0052] Figure 2 It is a structural diagram of a fully automated hot washing skid operation control system provided by the present invention. [Specific implementation method]

[0053] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings. It is understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention rather than all structures are shown in the accompanying drawings. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0054] The terms "including" and "having" and any variations thereof in the present invention are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products or devices.

[0055] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0056] See also Figure 1 As shown, the present invention provides a fully automated hot skid washing operation control method, the method comprising the following steps:

[0057] S100, analyzing the stress data inside the oil pumping equipment to determine whether the oil pumping equipment is in an overloaded state; when the oil pumping equipment is in an overloaded state, imaging and identifying the oil well where the oil pumping equipment is located to obtain spatial variation information of the well fluid flow inside the oil well, thereby estimating the wax deposition state information inside the oil well.

[0058] Furthermore, the stress data inside the oil pumping equipment is analyzed to determine whether the oil pumping equipment is in an overloaded state; when the oil pumping equipment is in an overloaded state, the oil well where the oil pumping equipment is located is imaged and identified to obtain the spatial change information of the well fluid flow inside the oil well, so as to estimate the wax deposition state information inside the oil well, specifically:

[0059] Perform deformation detection on the sucker rod of the oil pumping equipment to obtain deformation amplitude data and deformation direction data of the sucker rod in several oil pumping action cycles; perform inversion processing on the deformation amplitude data and deformation direction data to obtain stress data of the sucker rod in several oil pumping action cycles;

[0060] Perform time evolution analysis on stress data to determine whether the pumping rod shows a stress increase trend; if so, determine that the pumping equipment is in a working overload state; if not, determine that the pumping equipment is not in a working overload state;

[0061] When the oil pumping equipment is in an overloaded state, thermal imaging is performed on the oil well where the oil pumping equipment is located to obtain a global thermal infrared dynamic image of the oil well; the global thermal infrared dynamic image is frame-by-frame identified to obtain liquid boundary contour information of all image frames contained in the global thermal infrared dynamic image; the liquid boundary contour information of all image frames is subjected to time evolution analysis to obtain spatial volume change information of well fluid flow inside the oil well; based on the spatial volume change information of well fluid flow and the spatial volume information inside the oil well, the wax deposition state information inside the oil well is estimated; wherein the wax deposition state information includes the wax deposition volume and wax deposition position inside the oil well.

[0062] Pumping equipment such as pumping units are installed on oil wells. They use their own sucker rods to penetrate deep into the oil wells and realize up and down reciprocating motion under the drive of the pump, so as to extract the well fluid inside the oil well. When wax is formed inside the oil well, the wax will adhere to the surface of the sucker rod, which will hinder the up and down reciprocating motion of the sucker rod. At the same time, the wax will also reduce the flow space of the well fluid inside the oil well, resulting in the inability to quickly and smoothly pump out the well fluid. As the thickness of the wax on the surface of the sucker rod continues to increase, the obstruction force on the sucker rod also continues to increase, and the stress inside the sucker rod also continues to increase, thereby increasing the power output of the pump to the sucker rod, making the pumping equipment prone to overload. In the process of oil extraction, the waxing state of oil wells with different internal environments is not the same. In order to ensure the normal and stable operation of the pumping equipment, it is necessary to carry out hot washing and skidding operations in time before the wax inside the oil well reaches the limit state. According to the above-mentioned influence of wax deposition on whether the pumping equipment is overloaded, by detecting and analyzing the stress data inside the pumping equipment, it is determined whether the pumping equipment is in an overloaded state, and this is used as a basis for whether to start the hot washing skid operation of the oil well, so as to ensure timely and efficient hot washing and wax removal of the oil well. Specifically, the deformation sensor pre-installed on the sucker rod of the pumping equipment is used to detect the deformation of the sucker rod, and the deformation amplitude data and deformation direction data of the sucker rod in several pumping action cycles (i.e., several sucker rods perform up and down reciprocating motion cycles inside the oil well) are obtained, and the deformation amplitude data and deformation direction data are inverted to obtain the stress magnitude change data of the sucker rod in several pumping action cycles, and then the stress magnitude change data is analyzed by time evolution to determine whether the sucker rod shows a stress increase trend during the movement, so as to accurately determine whether the pumping equipment is in an overloaded state.

[0063] There is also uncertainty about the location and extent of wax deposition inside the oil well. The wax deposition thickness in some areas of the oil well is large, while the wax deposition thickness in other areas is small. The hot skid washing operation uses high-temperature and high-strength liquid to flush and dissolve the wax deposition inside the oil well. The physical form of the wax deposition inside the oil well determines the operating parameters of the hot skid washing operation. If the temperature of the liquid squeezed into the oil well is not high enough and / or the liquid is not high enough, the wax deposition may not be peeled off and dissolved from the surface of the sucker rod, reducing the efficiency of hot washing wax removal. In order to ensure that the wax deposition inside the oil well is completely removed in a short time, it is necessary to first identify the physical form of the wax deposition inside the oil well. Due to the geographical limitations of the oil well itself, it is impossible to directly survey the inside of the oil well. Accordingly, the oil well can be subjected to non-contact detection by thermal imaging to obtain a global thermal infrared dynamic image of the inside of the oil well, and a dynamic global record of the wax deposition situation inside the oil well can be made. The wax deposits and well fluid inside the oil well are two different substances, and the well fluid is fluid. The infrared band properties such as infrared light absorption rate of the two in thermal infrared images are different. The difference between wax deposits and well fluid in the infrared band can accurately distinguish and identify the physical form of wax deposits inside the oil well. Specifically, the global thermal infrared dynamic image is frame-by-frame identified to obtain the liquid boundary contour information of all image frames contained in the global thermal infrared dynamic image; the liquid boundary contour information of all image frames is analyzed for time evolution to obtain the spatial volume change information of the well fluid flow inside the oil well; based on the spatial volume change information of the well fluid flow and the spatial volume information inside the oil well, the wax state information such as the wax volume and wax position inside the oil well is estimated, providing important and accurate basis for the subsequent adjustment of the operating parameters of the hot skid washing operation.

[0064] S200, based on the wax deposition status information, soft start the rotary jet pump performing the hot wash skid operation; obtain the water output status data of the oil well after the rotary jet pump completes the soft start; analyze the water output status data to determine the wax deposition residual status information inside the oil well, thereby adjusting the hot water input status and / or hot water pumping status of the rotary jet pump.

[0065] Furthermore, based on the wax deposition status information, a soft start is implemented for the jet pump performing the hot skid washing operation, specifically:

[0066] Based on the wax deposition volume and wax deposition position inside the oil well included in the wax deposition state information, determining the wax deposition strength distribution characteristic information inside the oil well; wherein the wax deposition mechanical strength characteristic information includes the mechanical strength distribution information of the wax deposition formed inside the oil well along the depth direction;

[0067] Based on the wax deposition intensity distribution characteristic information, the minimum output hot water pressure of the rotary jet pump when performing hot washing skid operation on the oil well is determined; based on the minimum output hot water pressure, the initial starting voltage of the rotary jet pump for soft starting is determined, thereby implementing soft starting of the rotary jet pump.

[0068] Further, the water output state data of the oil well after the rotary jet pump completes the soft start is obtained; the water output state data is analyzed to determine the residual state information of wax deposition inside the oil well, thereby adjusting the hot water input state and / or hot water pumping state of the rotary jet pump, specifically:

[0069] Obtain the outlet water temperature data and outlet water dynamic images of the oil well after the jet pump completes soft start;

[0070] The time evolution analysis of the outlet water temperature data was performed to obtain the outlet water temperature change rate of the oil well; the color change analysis of the outlet water dynamic image was performed to obtain the outlet water wax content change rate of the oil well; based on the outlet water temperature change rate and the outlet water wax content change rate, the wax residue change information inside the oil well was estimated, which was used as the wax residue state information inside the oil well;

[0071] Based on the information on the change in the amount of wax residue inside the oil well, determine whether the currently performed hot washing skid operation can clean and remove wax that exceeds a preset volume within a unit time; if not, increase the hot water flow or hot water temperature input to the jet pump, and / or increase the pressure at which the jet pump pumps hot water into the oil well.

[0072] The rotary jet pump needs to apply a driving voltage during the startup process. In order to avoid interference and impact on the rotary jet pump by applying too large a driving voltage in a short time, the frequency converter is used to control the rotary jet pump for soft start, so that the rotary jet pump can gradually switch to a stable working state along the smooth voltage change curve. Through the above analysis, it can be seen that only when the pressure of the hot water input by the rotary jet pump to the inside of the oil well is high enough, the input hot water can flush the wax deposits; if the pressure of the input hot water is not high enough, the hot water will be blocked by the wax deposits and cannot penetrate into the inside of the oil well, which may cause liquid to overflow back to the rotary jet pump, affecting the normal operation of the rotary jet pump and even causing damage to the rotary jet pump. For this reason, during the soft start of the rotary jet pump, it is necessary to ensure that the rotary jet pump can output hot water with a high enough pressure during the soft start stage, which will destroy the wax deposit structure inside the oil well, so that hot water can be continuously injected into deeper areas inside the oil well, effectively separating the wax deposits from the surface of the sucker rod, and avoiding hot water overflow to the rotary jet pump. Specifically, based on the wax volume and wax position inside the oil well contained in the wax state information, the mechanical strength distribution information of the wax formed inside the oil well along the depth direction is determined, and the mechanical strength of the wax inside the oil well is accurately characterized, providing a basis for determining the minimum hot water pressure required to destroy the wax structure. Based on the wax strength distribution characteristic information, the initial starting voltage of the rotary jet pump soft start is determined, so that the rotary jet pump can form hot water with sufficient pressure during the soft start process, thereby improving the cleaning efficiency of the wax.

[0073] In addition, during the hot washing skid operation inside the oil well, the wax inside the oil well is continuously dissolved and cleaned. The wax will dissolve in the hot water and output to the outside. The greater the concentration of wax dissolved in the hot water, the greater the temperature of the hot water will drop accordingly. At the same time, the color of the hot water itself will gradually deepen. After multiple hot washing and wax removal operations, the amount of wax inside the oil well will gradually decrease. The temperature drop of the hot water output after each hot washing and wax removal operation will gradually decrease, and the color of the hot water will not become darker. Specifically, based on the outlet water temperature data and outlet water dynamic image of the oil well after the rotary jet pump completes the soft start, the outlet water temperature change rate and the outlet water wax material content change rate of the oil well are obtained, so as to estimate the change information of the residual amount of wax inside the oil well, so as to quantitatively judge whether the wax inside the oil well is effectively cleaned. Based on the change information of the residual amount of wax inside the oil well, it is judged whether the hot washing skid operation currently being performed can clean and remove the wax exceeding the preset volume within a unit time, and the hot water input state and / or hot water pumping state of the rotary jet pump are adaptively adjusted to ensure that the wax inside the oil well is thoroughly cleaned in a short time.

[0074] S300, collecting the current data inside the oil well, analyzing the changes in the current data, and obtaining the current change characteristic information; based on the current change characteristic information, judging whether the hot wash skid operation meets the end conditions; when the hot wash skid operation meets the end conditions, adjusting the soft stop operation state of the rotary jet pump based on the real-time operation state of the rotary jet pump.

[0075] Furthermore, the current data inside the oil well is collected, and the change of the current data is analyzed to obtain the current change characteristic information; based on the current change characteristic information, it is judged whether the hot washing skid operation meets the end condition; when the hot washing skid operation meets the end condition, the soft stop operation state of the rotary jet pump is adjusted based on the real-time operation state of the rotary jet pump, specifically:

[0076] Collect current data of several positions inside the oil well during the hot skid washing operation, analyze the time change of the current data, and obtain the current change characteristic information inside the oil well; wherein the current change characteristic information includes the change information of the current drop amplitude of each position point over time; based on the current change characteristic information, determine whether the current inside the oil well drops to a preset current threshold within a preset time range in the future; if so, determine that the hot skid washing operation meets the end condition; if not, determine that the hot skid washing operation does not meet the end condition;

[0077] When the hot wash skid operation meets the termination conditions, the pressure drop step length for the soft stop of the rotary jet pump is adjusted based on the real-time operating voltage information and the tolerable pressure drop information of the rotary jet pump.

[0078] As the hot skid washing operation is continuously carried out, the wax inside the oil well is gradually cleaned out, the obstruction force on the up and down reciprocating motion of the pumping rod inside the oil well gradually decreases, and the flow of well fluid inside the oil well becomes smooth and fast, so that the current inside the oil well will show a downward trend. By analyzing the changes in the current inside the oil well, it is possible to determine whether the inside of the oil well has recovered to an environmental state that satisfies the normal and stable operation of the pumping equipment, and provide an accurate basis for determining whether to end the hot skid washing operation. Specifically, the current data of several points inside the oil well during the execution of the hot skid washing operation are collected and analyzed for time changes, and the information on the change of the current drop amplitude of all points inside the oil well over time is obtained, and it is determined whether the current inside the oil well drops to the preset current threshold within the preset time range in the future, and whether the hot skid washing operation meets the termination conditions is accurately determined. And when the hot washing skid operation needs to be ended, in order to avoid a sudden interruption in the application of driving voltage to the rotary jet pump, which may cause a large impact on the rotary jet pump, the frequency converter is used to control the rotary jet pump to perform a soft stop. Based on the real-time operating voltage information and the tolerable voltage drop information of the rotary jet pump, the pressure drop step length of the soft stop of the rotary jet pump (that is, the voltage drop amplitude during the soft stop of the rotary jet pump) is adjusted, so that the rotary jet pump can gradually stop operating along a smooth voltage change curve, thereby ensuring the operational safety of the rotary jet pump.

[0079] See also Figure 2 As shown, the present invention provides a fully automated hot wash skid operation control system, which includes the following modules:

[0080] The stress change analysis module is used to analyze the stress data inside the oil pumping equipment to determine whether the oil pumping equipment is in an overload state;

[0081] The wax deposition state estimation module of the oil well is used to image and identify the oil well where the oil pumping equipment is located when the oil pumping equipment is in an overload state, and obtain the spatial change information of the well fluid flow inside the oil well, so as to estimate the wax deposition state information inside the oil well;

[0082] A soft start control module is used to implement soft start of the rotary jet pump performing hot washing skid operation based on wax deposition status information;

[0083] The rotary jet pump operation control module is used to obtain the water output status data of the oil well after the rotary jet pump completes the soft start; analyze the water output status data to determine the residual state information of the wax deposit inside the oil well, so as to adjust the hot water input state and / or hot water pumping state of the rotary jet pump;

[0084] The hot skid washing operation status judgment module is used to collect the current data inside the oil well, analyze the changes in the current data, and obtain the current change characteristic information; based on the current change characteristic information, it is judged whether the hot skid washing operation meets the end conditions;

[0085] The soft stop control module is used to adjust the soft stop operation state of the rotary jet pump based on the real-time operation state of the rotary jet pump when the hot washing skid operation meets the end conditions.

[0086] Furthermore, the stress change analysis module is used to analyze the stress data inside the oil pumping equipment to determine whether the oil pumping equipment is in an overload state, specifically:

[0087] Perform deformation detection on the sucker rod of the oil pumping equipment to obtain deformation amplitude data and deformation direction data of the sucker rod in several oil pumping action cycles; perform inversion processing on the deformation amplitude data and deformation direction data to obtain stress data of the sucker rod in several oil pumping action cycles;

[0088] Perform time evolution analysis on stress data to determine whether the pumping rod shows a stress increase trend; if so, determine that the pumping equipment is in a working overload state; if not, determine that the pumping equipment is not in a working overload state;

[0089] The wax deposition state estimation module of the oil well is used to image and identify the oil well where the oil pumping equipment is located when the oil pumping equipment is in an overload state, and obtain the spatial change information of the well fluid flow inside the oil well, so as to estimate the wax deposition state information inside the oil well, specifically:

[0090] When the pumping equipment is in the overload state, the oil well where the pumping equipment is located is thermally imaged to obtain the global thermal infrared dynamic image of the oil well; the global thermal infrared dynamic image is frame-by-frame identified to obtain the liquid boundary contour information of all image frames contained in the global thermal infrared dynamic image; the liquid boundary contour information of all image frames is analyzed for time evolution to obtain the spatial volume change information of the well fluid flow inside the oil well; based on the spatial volume change information of the well fluid flow and the spatial volume information inside the oil well, the wax state information inside the oil well is estimated; wherein the wax state information includes the wax volume and wax position inside the oil well. .

[0091] Furthermore, the soft start control module is used to implement soft start of the rotary jet pump performing the hot wash skid operation based on the wax deposition state information, specifically:

[0092] Based on the wax deposition volume and wax deposition position inside the oil well included in the wax deposition state information, determining the wax deposition strength distribution characteristic information inside the oil well; wherein the wax deposition mechanical strength characteristic information includes the mechanical strength distribution information of the wax deposition formed inside the oil well along the depth direction;

[0093] Based on the wax deposition intensity distribution characteristic information, the minimum output hot water pressure of the jet pump when performing hot washing skid operation on the oil well is determined; based on the minimum output hot water pressure, the initial starting voltage of the jet pump for soft start is determined, so as to implement soft start of the jet pump.

[0094] Furthermore, the rotary jet pump operation control module is used to obtain the water output state data of the oil well after the rotary jet pump completes the soft start; analyze the water output state data to determine the residual state information of the wax deposit inside the oil well, so as to adjust the hot water input state and / or hot water pumping state of the rotary jet pump, specifically:

[0095] Obtain the outlet water temperature data and outlet water dynamic images of the oil well after the jet pump completes soft start;

[0096] The time evolution analysis of the outlet water temperature data was performed to obtain the outlet water temperature change rate of the oil well; the color change analysis of the outlet water dynamic image was performed to obtain the outlet water wax content change rate of the oil well; based on the outlet water temperature change rate and the outlet water wax content change rate, the wax residue change information inside the oil well was estimated, which was used as the wax residue state information inside the oil well;

[0097] Based on the information on the change in the amount of wax residue inside the oil well, determine whether the currently performed hot washing skid operation can clean and remove wax that exceeds a preset volume within a unit time; if not, increase the hot water flow or hot water temperature input to the jet pump, and / or increase the pressure at which the jet pump pumps hot water into the oil well.

[0098] Furthermore, the hot skid washing operation status judgment module is used to collect the current data inside the oil well, analyze the change of the current data, and obtain the current change characteristic information; based on the current change characteristic information, it is judged whether the hot skid washing operation meets the end conditions, specifically:

[0099] Collect current data of several positions inside the oil well during the hot skid washing operation, analyze the time change of the current data, and obtain the current change characteristic information inside the oil well; wherein the current change characteristic information includes the change information of the current drop amplitude of each position point over time; based on the current change characteristic information, determine whether the current inside the oil well drops to a preset current threshold within a preset time range in the future; if so, determine that the hot skid washing operation meets the end condition; if not, determine that the hot skid washing operation does not meet the end condition;

[0100] The soft stop control module is used to adjust the soft stop operation state of the rotary jet pump based on the real-time operation state of the rotary jet pump when the hot washing skid operation meets the end conditions. Specifically:

[0101] When the hot wash skid operation meets the termination conditions, the pressure drop step length for the soft stop of the rotary jet pump is adjusted based on the real-time operating voltage information and the tolerable pressure drop information of the rotary jet pump.

[0102] The operation and effect of the fully automatic hot washing skid operation control system of the present invention correspond to and are consistent with the above-mentioned fully automatic hot washing skid operation control method, and the fully automatic hot washing skid operation control system will not be described repeatedly here.

[0103] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it, and other embodiments may also be used. Although the present invention has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A fully automated hot wash skid operation control method, characterized in that: The method comprises the following steps: Analyze the stress data inside the oil pumping equipment to determine whether the oil pumping equipment is in an overload state; when the oil pumping equipment is in an overload state, image and identify the oil well where the oil pumping equipment is located to obtain spatial variation information of the well fluid flow inside the oil well, thereby estimating the wax deposition state information inside the oil well; Based on the wax deposition state information, a soft start is performed on the rotary jet pump that performs the hot skid washing operation; water output state data of the oil well is obtained after the rotary jet pump completes the soft start; the water output state data is analyzed to determine the residual state information of the wax deposition inside the oil well, thereby adjusting the hot water input state and / or hot water pumping state of the rotary jet pump; The current data inside the oil well is collected, and the change of the current data is analyzed to obtain the current change characteristic information; based on the current change characteristic information, it is judged whether the hot wash skid operation meets the end condition; when the hot wash skid operation meets the end condition, the soft stop operation state of the rotary jet pump is adjusted based on the real-time operation state of the rotary jet pump.

2. The method according to claim 1, characterized in that The stress data inside the oil pumping equipment is analyzed to determine whether the oil pumping equipment is in a working overload state; when the oil pumping equipment is in a working overload state, imaging and identifying the oil well where the oil pumping equipment is located is performed to obtain spatial variation information of the well fluid flow inside the oil well, thereby estimating the wax deposition state information inside the oil well, specifically: Performing deformation detection on the sucker rod of the oil pumping equipment to obtain deformation amplitude data and deformation direction data of the sucker rod in several oil pumping action cycles; performing inversion processing on the deformation amplitude data and the deformation direction data to obtain stress data of the sucker rod in the several oil pumping action cycles; Performing a time evolution analysis on the stress data to determine whether the sucker rod presents a stress increasing trend; If yes, it is determined that the oil pumping equipment is in an overloaded state; if no, it is determined that the oil pumping equipment is not in an overloaded state; When the oil pumping equipment is in an overloaded state, thermal imaging is performed on the oil well where the oil pumping equipment is located to obtain a global thermal infrared dynamic image of the oil well; frame recognition is performed on the global thermal infrared dynamic image to obtain liquid boundary contour information of all image frames contained in the global thermal infrared dynamic image; time evolution analysis is performed on the liquid boundary contour information of all image frames to obtain spatial volume change information of well fluid flow inside the oil well; based on the spatial volume change information of well fluid flow and the spatial volume information inside the oil well, the wax deposition status information inside the oil well is estimated; wherein the wax deposition status information includes the wax deposition volume and wax deposition position inside the oil well.

3. The method according to claim 1, characterized in that Based on the wax deposition state information, the rotary jet pump performing the hot skid washing operation is soft-started, specifically: Based on the wax deposition volume and wax deposition position inside the oil well contained in the wax deposition state information, determining the wax deposition strength distribution characteristic information inside the oil well; wherein the wax deposition mechanical strength characteristic information includes the mechanical strength distribution information of the wax deposition formed inside the oil well along the depth direction; Based on the wax deposition intensity distribution characteristic information, the minimum output hot water pressure of the rotary jet pump when performing hot washing and skidding operations on the oil well is determined; based on the minimum output hot water pressure, the initial starting voltage for soft starting of the rotary jet pump is determined, thereby implementing soft starting of the rotary jet pump.

4. The method according to claim 3, characterized in that The step of obtaining the water output state data of the oil well after the rotary jet pump completes the soft start; analyzing the water output state data to determine the residual state information of wax deposition inside the oil well, thereby adjusting the hot water input state and / or hot water pumping state of the rotary jet pump, is specifically as follows: Acquire the outlet water temperature data and outlet water dynamic image of the oil well after the rotary jet pump completes soft start; Performing a time evolution analysis on the outlet water temperature data to obtain the outlet water temperature change rate of the oil well; performing a color change analysis on the outlet water dynamic image to obtain the outlet water wax content change rate of the oil well; estimating the wax residue change information inside the oil well based on the outlet water temperature change rate and the outlet water wax content change rate, and using this as the wax residue state information inside the oil well; Based on the information on the change in the residual amount of wax deposits inside the oil well, determining whether the currently executed hot skid cleaning operation can clean and remove wax deposits exceeding a preset volume within a unit time; If not, the flow rate or temperature of the hot water input to the rotary jet pump is increased, and / or the pressure at which the rotary jet pump pumps the hot water into the oil well is increased.

5. The method according to claim 1, characterized in that The current data inside the oil well is collected, and the change analysis of the current data is performed to obtain the current change characteristic information; based on the current change characteristic information, it is judged whether the hot skid washing operation meets the end condition; when the hot skid washing operation meets the end condition, the soft stop operation state of the rotary jet pump is adjusted based on the real-time operation state of the rotary jet pump, specifically: Collecting current data of several positions inside the oil well during the execution of the hot skid washing operation, performing time change analysis on the current data, and obtaining current change characteristic information inside the oil well; wherein the current change characteristic information includes information on the change of the current drop amplitude of each of the positions over time; based on the current change characteristic information, determining whether the current inside the oil well drops to a preset current threshold within a preset time range in the future; if so, judging that the hot skid washing operation meets the termination condition; if not, judging that the hot skid washing operation does not meet the termination condition; When the hot scrubbing skid operation meets the termination condition, the pressure drop step length of the rotary jet pump for soft stopping is adjusted based on the real-time operating voltage information and the tolerable pressure drop information of the rotary jet pump.

6. A fully automated hot wash skid operation control system, characterized in that: The system includes the following modules: A stress change analysis module is used to analyze stress data inside the oil pumping equipment to determine whether the oil pumping equipment is in a working overload state; The wax deposition state estimation module of the oil well is used to perform imaging recognition on the oil well where the oil pumping equipment is located when the oil pumping equipment is in a working overload state, obtain the spatial variation information of the well fluid flow inside the oil well, and estimate the wax deposition state information inside the oil well; A soft start control module, used for soft starting the rotary jet pump performing the hot skid washing operation based on the wax deposition state information; The rotary jet pump operation control module is used to obtain the water output state data of the oil well after the rotary jet pump completes the soft start; analyze the water output state data to determine the residual state information of the wax deposit inside the oil well, so as to adjust the hot water input state and / or hot water pumping state of the rotary jet pump; A hot skid washing operation state judgment module is used to collect the current data inside the oil well, perform change analysis on the current data, and obtain current change characteristic information; Based on the current change characteristic information, determining whether the hot skid washing operation meets the termination condition; The soft stop control module is used to adjust the soft stop operation state of the rotary spray pump based on the real-time operation state of the rotary spray pump when the hot washing skid operation meets the end condition.

7. The system according to claim 6, characterized in that The stress change analysis module is used to analyze the stress data inside the oil pumping equipment to determine whether the oil pumping equipment is in an overload state, specifically: Performing deformation detection on the sucker rod of the oil pumping equipment to obtain deformation amplitude data and deformation direction data of the sucker rod in several oil pumping action cycles; performing inversion processing on the deformation amplitude data and the deformation direction data to obtain stress data of the sucker rod in the several oil pumping action cycles; Performing a time evolution analysis on the stress data to determine whether the sucker rod presents a stress increasing trend; If yes, it is determined that the oil pumping equipment is in an overloaded state; if no, it is determined that the oil pumping equipment is not in an overloaded state; The oil well waxing state estimation module is used to perform imaging recognition on the oil well where the oil pumping equipment is located when the oil pumping equipment is in a working overload state, and obtain the spatial change information of the well fluid flow inside the oil well, so as to estimate the waxing state information inside the oil well, specifically: When the oil pumping equipment is in an overloaded state, thermal imaging is performed on the oil well where the oil pumping equipment is located to obtain a global thermal infrared dynamic image of the oil well; frame recognition is performed on the global thermal infrared dynamic image to obtain liquid boundary contour information of all image frames contained in the global thermal infrared dynamic image; time evolution analysis is performed on the liquid boundary contour information of all image frames to obtain spatial volume change information of well fluid flow inside the oil well; based on the spatial volume change information of well fluid flow and the spatial volume information inside the oil well, the wax deposition status information inside the oil well is estimated; wherein the wax deposition status information includes the wax deposition volume and wax deposition position inside the oil well.

8. The system according to claim 6, characterized in that The soft start control module is used to implement soft start on the rotary jet pump performing the hot skid washing operation based on the wax deposition state information, specifically: Based on the wax deposition volume and wax deposition position inside the oil well contained in the wax deposition state information, determining the wax deposition strength distribution characteristic information inside the oil well; wherein the wax deposition mechanical strength characteristic information includes the mechanical strength distribution information of the wax deposition formed inside the oil well along the depth direction; Based on the wax deposition intensity distribution characteristic information, the minimum output hot water pressure of the rotary jet pump when performing hot washing and skidding operations on the oil well is determined; based on the minimum output hot water pressure, the initial starting voltage for soft starting of the rotary jet pump is determined, thereby implementing soft starting of the rotary jet pump.

9. The system according to claim 8, characterized in that The rotary jet pump operation control module is used to obtain the water output state data of the oil well after the rotary jet pump completes the soft start; analyze the water output state data to determine the residual state information of wax deposition inside the oil well, so as to adjust the hot water input state and / or hot water pumping state of the rotary jet pump, specifically: Acquire the outlet water temperature data and outlet water dynamic image of the oil well after the rotary jet pump completes soft start; Performing a time evolution analysis on the outlet water temperature data to obtain the outlet water temperature change rate of the oil well; performing a color change analysis on the outlet water dynamic image to obtain the outlet water wax content change rate of the oil well; estimating the wax residue change information inside the oil well based on the outlet water temperature change rate and the outlet water wax content change rate, and using this as the wax residue state information inside the oil well; Based on the information on the change in the residual amount of wax deposits inside the oil well, determining whether the currently executed hot skid cleaning operation can clean and remove wax deposits exceeding a preset volume within a unit time; If not, the flow rate or temperature of the hot water input to the rotary jet pump is increased, and / or the pressure at which the rotary jet pump pumps the hot water into the oil well is increased.

10. The system according to claim 6, characterized in that The hot skid washing operation state judgment module is used to collect the current data inside the oil well, perform change analysis on the current data, and obtain current change characteristic information; based on the current change characteristic information, judge whether the hot skid washing operation meets the end condition, specifically: Collecting current data of several positions inside the oil well during the execution of the hot skid washing operation, performing time change analysis on the current data, and obtaining current change characteristic information inside the oil well; wherein the current change characteristic information includes information on the change of the current drop amplitude of each of the positions over time; based on the current change characteristic information, determining whether the current inside the oil well drops to a preset current threshold within a preset time range in the future; if so, judging that the hot skid washing operation meets the termination condition; if not, judging that the hot skid washing operation does not meet the termination condition; The soft stop control module is used to adjust the soft stop operation state of the rotary spray pump based on the real-time operation state of the rotary spray pump when the hot washing skid operation meets the end condition, specifically: When the hot scrubbing skid operation meets the termination condition, the pressure drop step length of the rotary jet pump for soft stopping is adjusted based on the real-time operating voltage information and the tolerable pressure drop information of the rotary jet pump.

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