Energy efficiency evaluation method and system for pumping unit mechanical extraction system

Abstract

The invention relates to an energy efficiency evaluation method and system for a pumping unit mechanical extraction system, and the method comprises the steps: building an efficiency evaluation diagram based on the historical oil pumping data of the pumping unit mechanical extraction system; wherein the efficiency evaluation chart comprises a special effect area, an efficient area, a standard reaching area, a ground potential area, a shaft potential area, a ground low-efficiency area, a shaft low-efficiency area and a negative value area; the ground efficiency is determined according to the input power and the polish rod power, obtained in real time, of the pumping unit mechanical extraction system; the underground efficiency is determined according to the effective power and the polish rod power, obtained in real time, of the pumping unit mechanical extraction system; and determining an energy efficiency evaluation result of the pumping unit mechanical extraction system according to the ground efficiency, the underground efficiency and the efficiency evaluation map of the pumping unit mechanical extraction system. According to the method, the ground efficiency, the underground efficiency and the system efficiency are summarized, the pumping unit mechanical extraction system is analyzed from three directions, the problems of the pumping unit mechanical extraction system can be judged more quickly, and the inspection time of the pumping unit mechanical extraction system is shortened.

Description

Technical Field

[0001] The invention relates to an energy efficiency evaluation method and system for an oil pumping system. Background Art

[0002] In the prior art, the energy efficiency evaluation of the oil pumping system can often only obtain the result of abnormal oil production efficiency, but cannot determine the problem of the oil pumping system. It is not possible to intuitively see where the problem of the oil pumping system is from the numerous data in the oil pumping system. The problem of the oil pumping system can only be inferred through the experience of relevant personnel. However, once the oil pumping system needs to be inspected, the human resources consumed are very huge, which seriously affects the production efficiency. Therefore, how to propose an energy efficiency evaluation method for the oil pumping system that can directly determine the abnormal situation of the oil pumping system and reduce the number of maintenance times and reduce the loss of downtime has become a problem that needs to be solved urgently. Summary of the invention

[0003] In order to enrich the types of energy efficiency evaluation methods for oil pumping machine production systems in the prior art and reduce the number of maintenance times and downtime losses of oil pumping machine production systems, the present invention proposes an energy efficiency evaluation method and system for oil pumping machine production systems. The technical solution proposed by the present invention is as follows:

[0004] In a first aspect, the present invention provides an energy efficiency evaluation method for an oil pumping system, comprising:

[0005] Based on the historical oil extraction data of the pumping system, an efficiency evaluation diagram is established; wherein the efficiency evaluation diagram includes a special effect area, a high efficiency area, a standard area, a ground potential area, a wellbore potential area, a ground inefficient area, a wellbore inefficient area and a negative value area;

[0006] Determine the surface efficiency based on the real-time input power and bare rod power of the pumping system;

[0007] Determine the downhole efficiency according to the effective power of the pumping unit system and the polished rod power obtained in real time;

[0008] The energy efficiency evaluation result of the oil pumping unit production system is determined according to the surface efficiency, the downhole efficiency and the efficiency evaluation diagram of the oil pumping unit production system.

[0009] In one or some embodiments, the efficiency evaluation diagram is established based on the historical oil extraction data of the oil pumping system;

[0010] A plane rectangular coordinate system is established with downhole efficiency as the horizontal axis and surface efficiency as the vertical axis;

[0011] Projecting the historical oil extraction data of the oil pumping system on the coordinate system, connecting the points with the same system efficiency on the coordinate system, and obtaining a system efficiency curve; wherein the system efficiency curve divides the coordinate system into a plurality of regions;

[0012] A plurality of straight lines representing the same downhole efficiency and ground efficiency are added to the coordinate system, the plurality of regions are further divided, and the corresponding system efficiency value is marked on each of the system efficiency curves. Each divided region is named according to the system efficiency value and a pre-established regional division rule, to obtain the efficiency evaluation diagram.

[0013] In one or some embodiments, determining the surface efficiency according to the input power and polished rod power of the oil pumping system acquired in real time includes:

[0014] According to the input power and bare rod power of the pumping system, the surface efficiency is determined by the following formula:

[0015]

[0016] Where η s is the ground efficiency, N P is the polished rod power, N i is the input power;

[0017] The polished rod power N P Calculated by the following formula:

[0018]

[0019] Where W r ' is the weight of the sucker rod string in the pumped liquid, s is the stroke of the sucker rod string, and n is the number of strokes of the sucker rod string.

[0020] In one or some embodiments, the weight W of the sucker rod string in the pumped liquid is r ' is calculated by the following formula:

[0021] W r ′=q r (ρ s -ρ L ) r / ρ s ;

[0022] In the formula, q r is the mass of the sucker rod per meter, ρ s is the density of the sucker rod string, L r is the length of the sucker rod string, ρ L is the density of the liquid and g is the acceleration due to gravity.

[0023] In one or some embodiments, determining the downhole efficiency according to the effective power of the oil pumping system and the polished rod power obtained in real time includes:

[0024] According to the obtained effective power of the pumping system and the polished rod power, the downhole efficiency is determined by the following formula:

[0025]

[0026] Where η w is the downhole efficiency, N e is the effective power, N P is the bare rod power;

[0027] The effective power N e Calculated by the following formula:

[0028]

[0029] Where Q is the liquid production of the oil well, ρ is the liquid density, H is the effective head, and g is the acceleration of gravity.

[0030] In one or some embodiments, the effective lift H is calculated by the following formula:

[0031]

[0032] Where, L f is the distance between the moving liquid surface and the ground, p t is the oil pressure, p c is the casing pressure, ρ L is the density of the liquid and g is the acceleration due to gravity.

[0033] In one or some embodiments, the oil well liquid production Q is calculated by the following formula:

[0034] Q=1130.9733×D 2 ×s×n;

[0035] Where D is the diameter of the sucker pump, s is the stroke of the sucker rod string, and n is the number of strokes of the sucker rod string.

[0036] In one or some embodiments, the multiple regions in each of the efficiency evaluation graphs are divided in the following manner:

[0037] Marking the area where the system efficiency is ≥42% and ≤100%, the surface efficiency is ≥42% and ≤100%, and the downhole efficiency is ≥42% and ≤100% as the special effect area;

[0038] Marking the area where the system efficiency is ≥31% and ≤42%, the surface efficiency is ≥45% and ≤65%, and the downhole efficiency is ≥45% and ≤65% as the high-efficiency area;

[0039] Marking the area where the system efficiency is ≥20% and ≤31%, the surface efficiency is ≥45% and ≤65%, and the downhole efficiency is ≥45% and ≤65% as the standard-reaching area;

[0040] Marking the area where the system efficiency is ≥20% and ≤31%, the downhole efficiency is ≥45% and ≤100%, and the surface efficiency is ≥20% and ≤31% as the surface potential area;

[0041] Marking the area where the system efficiency is ≥20% and ≤31%, the surface efficiency is ≥45% and ≤100%, and the downhole efficiency is ≥20% and ≤31% as the wellbore potential area;

[0042] Marking the area where the system efficiency is ≥0% and ≤20%, the surface efficiency is ≥0% and ≤45%, and the downhole efficiency is ≥0% and ≤65% as the surface low-efficiency area;

[0043] Marking the area where the system efficiency is ≥0% and ≤20%, the downhole efficiency is ≥0% and ≤45%, and the surface efficiency is ≥0% and ≤65% as the wellbore inefficient area;

[0044] The area where the system efficiency is ≤0%, the downhole efficiency is ≤0%, the surface efficiency is ≥0%, and ≤100% is marked as the negative value area.

[0045] In one or some embodiments, the energy efficiency evaluation result includes a system efficiency evaluation result;

[0046] Determining the energy efficiency evaluation result of the oil pumping system according to the surface efficiency, the downhole efficiency and the efficiency evaluation diagram of the oil pumping system comprises:

[0047] According to the surface efficiency and the downhole efficiency of the oil pumping system, a point is projected on the efficiency evaluation graph to obtain a system efficiency point;

[0048] The target area where the system efficiency point is located is obtained, and the system efficiency evaluation result of the oil pumping system is determined according to the target area.

[0049] In one or some embodiments, the method further comprises:

[0050] According to the predetermined reference value of the surface efficiency and the reference value of the downhole efficiency, the level of the surface efficiency and the level of the downhole efficiency are determined respectively as the secondary evaluation result of the pumping unit production system; wherein the secondary evaluation result includes:

[0051] Ground efficiency special effect, or ground efficiency high, or ground efficiency meets the standard, or ground efficiency is low; and / or

[0052] Downhole efficiency special effect, or downhole efficiency high efficiency, or downhole efficiency meets the standard, or downhole efficiency is inefficient.

[0053] In one or some embodiments, the method further comprises: determining a cause of the abnormality according to the level of the surface efficiency and the level of the downhole efficiency.

[0054] In one or some embodiments, determining the abnormality cause according to the surface efficiency level and the downhole efficiency level includes:

[0055] Determine at the time of the ground efficiency effect:

[0056] The area of ​​the dynamometer diagram is greater than a first preset area threshold; and / or

[0057] The measured string stroke frequency is less than the first preset stroke frequency threshold; and / or

[0058] The measured input power is less than the preset input power threshold;

[0059] In the case of downhole efficiency effects, it is determined that:

[0060] The liquid output is greater than a preset liquid output threshold, the pipe string lifting height is greater than a preset height threshold, resulting in the effective work being greater than a preset threshold; and / or

[0061] The area of ​​the dynamometer diagram is smaller than the second preset area threshold, and the measured string strokes are smaller than the second preset strokes threshold, resulting in the polished rod power being smaller than the preset polished rod power threshold; and / or

[0062] The downhole efficiency caused by spraying and pumping is greater than the preset downhole efficiency threshold;

[0063] Determine when the ground efficiency is inefficient:

[0064] The motor efficiency is below a preset electrode efficiency threshold; and / or

[0065] The belt and reduction gearbox transmission efficiency is lower than the preset transmission power threshold; and / or

[0066] The four-bar linkage efficiency is lower than the preset linkage power threshold;

[0067] Determine when the ground efficiency is inefficient:

[0068] The packing efficiency is below a preset packing efficiency threshold; and / or

[0069] The sucker rod efficiency is below a preset sucker rod power threshold; and / or

[0070] The oil well pump efficiency is lower than a preset oil well pump efficiency threshold; and / or

[0071] The string efficiency is lower than the preset string efficiency threshold.

[0072] In a second aspect, the present invention provides an energy efficiency evaluation system for an oil pumping system, comprising:

[0073] An efficiency evaluation diagram determination module is used to establish an efficiency evaluation diagram based on historical oil extraction data of the pumping unit production system; wherein the efficiency evaluation diagram includes a special effect area, a high efficiency area, a standard-reaching area, a ground potential area, a wellbore potential area, a ground inefficiency area, a wellbore inefficiency area and a negative value area;

[0074] The first calculation module is used to determine the surface efficiency according to the input power and the bare rod power of the oil pumping system acquired in real time;

[0075] The second calculation module is used to determine the downhole efficiency according to the effective power of the oil pumping system and the polished rod power obtained in real time;

[0076] The energy efficiency evaluation module is used to determine the energy efficiency evaluation result of the oil pumping system according to the surface efficiency, the downhole efficiency and the efficiency evaluation diagram of the oil pumping system.

[0077] In a third aspect, the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the energy efficiency evaluation method for an oil pumping system as described in the first aspect.

[0078] In a fourth aspect, the present invention provides an electronic device, comprising a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory communicate with each other via the communication bus;

[0079] Memory, used to store computer programs;

[0080] The processor is used to implement the energy efficiency evaluation method of the oil pumping system as described in the first aspect when executing the program stored in the memory.

[0081] Based on the above technical solution, the beneficial effects of the present invention compared with the prior art are as follows:

[0082] The energy efficiency evaluation method of the oil pumping system provided by the embodiment of the present invention determines an efficiency evaluation diagram based on the historical oil pumping data of the oil pumping system. The efficiency evaluation diagram includes ground efficiency, downhole efficiency and system efficiency. The efficiency rating diagram is divided into multiple areas according to the system efficiency, downhole efficiency and ground efficiency. The ground efficiency of the oil pumping system and the downhole efficiency of the oil pumping system are calculated. The downhole efficiency and the ground efficiency will be updated in real time according to the use of the oil pumping system. The downhole efficiency and the ground efficiency updated in real time are brought into the efficiency evaluation diagram, so as to evaluate the energy efficiency of the oil pumping system. Since the ground efficiency and the downhole efficiency are updated in real time, the real-time energy efficiency evaluation of the entire oil pumping system can be fed back in real time. The ground efficiency and the downhole efficiency can be fed back in the efficiency evaluation diagram. Therefore, when the system efficiency is too high or too low, it can be intuitively judged whether there is a problem with the ground equipment or the downhole equipment, so as to conduct further detection. The system efficiency of the oil pumping system can be obtained by multiplying the ground efficiency by the downhole efficiency. In this application, the ground efficiency, downhole efficiency and system efficiency are summarized, and the oil pumping system is analyzed from three directions together. The problems of the oil pumping system can be judged more quickly, and the inspection time of the oil pumping system can be shortened. At the same time, the oil pumping system can be prevented from shutting down under the premise of being able to create economic benefits. According to the specific analysis of the specific situation, the huge economic losses caused by the long-term shutdown of the oil pumping system can be avoided.

[0083] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description, claims and drawings.

[0084] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0085] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0086] Figure 1 It is a flow chart of an energy efficiency evaluation method of a pumping unit production system according to an embodiment of the present invention;

[0087] Figure 2is a schematic diagram of an efficiency evaluation diagram of an oil pumping system according to an embodiment of the present invention;

[0088] Figure 3 It is a structural schematic diagram of an energy efficiency evaluation system of an oil pumping system according to an embodiment of the present invention.

[0089] Figure 4 It is a schematic diagram of the structure of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0090] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0091] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Instead, they are merely examples of devices and methods consistent with some aspects of the present invention as detailed in the appended claims.

[0092] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0093] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0094] The inventor found in the work that the schemes adopted in some prior arts often obtain the motor efficiency, motor transmission mechanism efficiency, four-bar efficiency, bare rod efficiency, oil pump efficiency, and oil pipe efficiency. And determine which position needs maintenance based on these parameters. However, it often lacks integrity. As long as any efficiency value in the equipment is detected to be abnormal, it is considered that the equipment has a problem and is overhauled. Although this method can well determine the specific equipment problem. However, it will cause the shutdown of the oil well, which will lead to economic losses. For example, when it is determined that the ground efficiency is less than a certain value, it will remind you to check and modify the design of the bottom surface device of the oil well, or when it is determined that the downhole efficiency is lower than a certain value, it will remind you to check and modify the design of the underground device of the oil well. Although this design can indeed improve the pumping efficiency of the entire pumping device, the time consumed by the overhaul will cause the shutdown of the oil well, and the underground situation is complicated. After the overhaul, it is impossible to determine the time when the oil well can continue to produce oil. Therefore, the scheme in the prior art is more suitable for ideal conditions, but in actual use, due to various influences, the actual repair needs cannot be fully executed according to the ideal state. In particular, when the overall efficiency is still good, but one of the downhole efficiency or the uphole efficiency is low, the downtime loss caused by equipment maintenance may be higher than the extra oil cost after maintenance compared to before maintenance, and multiple maintenance will increase the loss caused by downtime, and can only ensure that the equipment is maintained at a stable efficiency, resulting in a situation where the maintenance cost is greater than the product value, which cannot meet the inventor's expectations.

[0095] Therefore, how to propose an energy efficiency evaluation method for a pumping unit extraction system that can directly determine abnormal conditions that occur in the pumping unit extraction system and reduce the number of maintenance times and the loss of downtime has become a problem that needs to be solved urgently. The inventor has made the present invention after further research and development.

[0096] Embodiment 1

[0097] The embodiment of the present invention provides an energy efficiency evaluation method for a pumping unit production system, referring to Figure 1 As shown, including:

[0098] S101, based on the historical oil extraction data of the oil pumping system, establish an efficiency evaluation diagram; wherein the efficiency evaluation diagram includes a special effect area, a high efficiency area, a standard area, a ground potential area, a wellbore potential area, a ground inefficient area, a wellbore inefficient area and a negative value area;

[0099] The efficiency evaluation diagram includes surface efficiency, downhole efficiency and system efficiency. Figure 2 As shown, the efficiency rating diagram is divided into multiple areas according to system efficiency, downhole efficiency and surface efficiency, including special effect area, high efficiency area, standard-reaching area, surface potential area, wellbore potential area, surface inefficiency area, wellbore inefficiency area and negative value area.

[0100] S102, determining the surface efficiency according to the input power and the bare rod power of the oil pumping system acquired in real time;

[0101] In the above technical solution, the step of calculating the ground efficiency of the oil pumping system includes: obtaining the input power of the oil pumping system; obtaining the bare rod power of the oil pumping system; and calculating the ground efficiency according to the bare rod power and the input power, where the ground efficiency = bare rod power ÷ input power. In the technical solution, the input power of the oil pumping system and the bare rod power of the oil pumping system are first obtained, and the ground power is calculated by the input power and the bare rod power. The input power of the oil pumping system is the power of the electric energy input to the oil pumping system. The bare rod power is the actual power that can be generated by the oil pumping device on the ground in the oil pumping system. In other words, the ground efficiency represents the actual energy conversion rate of the oil pumping device on the ground in the oil pumping system. In this way, the device on the ground can be distinguished from the device in the well as a whole, and the device on the ground is relatively less difficult to overhaul and maintain, so distinguishing the ground efficiency separately can more intuitively judge the difficulty of overhaul and maintenance. Especially during the inspection and maintenance process, the ground equipment can be directly inspected by the staff, and most inspections only require a short shutdown, or even no shutdown. Therefore, checking the ground efficiency as a separate parameter can effectively reduce the difficulty of inspection and maintenance. In the process of energy efficiency evaluation, if the problem is found to be caused by the ground efficiency, it can effectively avoid long shutdowns and there is no need to check the underground equipment, further reducing the inspection cost.

[0102] S103, determining downhole efficiency according to the effective power of the oil pumping system and the polished rod power obtained in real time;

[0103] In the above technical scheme, the steps of calculating the downhole efficiency of the pumping unit extraction system include: obtaining the bare rod power of the pumping unit extraction system; obtaining the effective power of the pumping unit extraction system; calculating the downhole efficiency according to the bare rod power and the effective power, and the downhole efficiency = effective power ÷ bare rod power. In this technical scheme, the downhole efficiency is calculated by the effective power and the bare rod power. Among them, the effective power represents the energy of the oil output from the well. The downhole efficiency is calculated by integrating the downhole part into a whole, and integrating the bare rod power input to the downhole part and the effective power output, so as to infer whether there is an abnormality in the downhole part. Due to the difficulty of inspection and maintenance of the downhole part, the staff cannot directly check the problems of the downhole part, so the downtime is very long, which will cause great economic losses. In order to avoid downtime caused by long-term maintenance, the power of the downhole part is calculated separately. Thereby avoiding downtime caused when there is no problem in the downhole part.

[0104] S104, determining an energy efficiency evaluation result of the oil pumping system according to the surface efficiency, the downhole efficiency and the efficiency evaluation diagram of the oil pumping system.

[0105] In this embodiment, after obtaining the surface efficiency of the pumping system and the downhole efficiency of the pumping system, the horizontal and vertical coordinates in the efficiency evaluation diagram are obtained. Since the product of the downhole efficiency and the surface efficiency is the system efficiency, a system efficiency point can be obtained in the efficiency evaluation diagram. Since the efficiency evaluation diagram has been partitioned, the target area where the system efficiency point is located can be directly determined, and then the system efficiency evaluation of the pumping system can be determined according to the target area. Since different situations have been classified in the efficiency evaluation diagram, after determining the surface efficiency and the downhole efficiency, the system efficiency evaluation of the pumping system can be directly determined. Then, it is judged whether there is a problem with the pumping system, and it is directly judged whether the problem is with the surface equipment or the downhole equipment, so as to facilitate further inspection and maintenance.

[0106] The present invention relates to the field of energy efficiency evaluation of oil pumping machine production systems, and more specifically, to an efficiency evaluation method for oil pumping machine production systems based on Internet of Things big data. Based on Internet of Things big data, the present invention is applicable to oil pumping machine wells with complete Internet of Things configurations, and all parameters involved are automatically collected, automatically calculated and analyzed, without manual monitoring.

[0107] The energy efficiency evaluation method of the oil pumping machine extraction system provided by the present invention calculates the surface efficiency of the oil pumping machine extraction system and the downhole efficiency of the oil pumping machine extraction system. The downhole efficiency and the surface efficiency will be updated in real time according to the use of the oil pumping machine extraction system. The downhole efficiency and the surface efficiency updated in real time are brought into the efficiency evaluation graph, so as to evaluate the energy efficiency of the oil pumping machine extraction system. Since the surface efficiency and the downhole efficiency are updated in real time, the real-time energy efficiency evaluation of the entire oil pumping machine extraction system can be fed back in real time. The surface efficiency and the downhole efficiency can be fed back in the efficiency evaluation graph. Therefore, when the system efficiency is too high or too low, it can be intuitively judged whether there is a problem with the surface equipment or the downhole equipment, so as to conduct further detection. The shutdown and maintenance of the oil pumping system is a very complicated process. If the problem cannot be clearly determined and the system is shut down rashly, it will cause great economic losses. Therefore, in order to obtain the actual situation of the oil pumping system more accurately and intuitively judge the problem of the oil pumping system, this application summarizes the ground efficiency, downhole efficiency and system efficiency, and analyzes the oil pumping system from three directions. It can judge the problems of the oil pumping system more quickly, shorten the inspection time of the oil pumping system, and prevent the oil pumping system from shutting down under the premise of being able to create economic benefits. According to the specific analysis of the specific situation, the huge economic losses caused by the long-term shutdown of the oil pumping system are avoided.

[0108] In an optional embodiment, the efficiency evaluation diagram is established based on the historical oil pumping data of the oil pumping system described in S101 above;

[0109] Reference Figure 2 As shown, a plane rectangular coordinate system is established with downhole efficiency as the horizontal axis and ground efficiency as the vertical axis; the historical oil extraction data of the pumping system are projected on the coordinate system, and the points with the same system efficiency on the coordinate system are connected to obtain a system efficiency curve; wherein, the system efficiency curve divides the coordinate system into multiple regions; multiple straight lines representing the same downhole efficiency and ground efficiency are added to the coordinate system to further divide the multiple regions, and the corresponding system efficiency value is marked on each of the system efficiency curves, and each divided region is named according to the system efficiency value and the pre-established regional division rule to obtain the efficiency evaluation graph.

[0110] The above-mentioned historical oil pumping data refers to the input power and bare rod power of the oil pumping system over a period of time, as well as the effective power and the bare rod power. For the historical oil pumping data at each sampling moment, the corresponding ground efficiency and downhole efficiency are respectively determined by the methods such as the above-mentioned steps S102 and S103, and the ground efficiency and the downhole efficiency are multiplied to obtain the system power.

[0111] In this technical solution, the efficiency evaluation diagram is a plane rectangular coordinate system established with downhole efficiency as the horizontal axis and ground efficiency as the vertical axis. Since the product of downhole efficiency and ground efficiency is the system efficiency, after determining the system efficiency value, multiple system efficiency curves can be obtained by connecting points with the same system efficiency on the coordinate system. The system efficiency of each point on the system efficiency curve is the same. According to multiple system efficiency curves, the efficiency evaluation diagram can be divided into multiple areas. On the basis of the system efficiency curve, multiple straight lines representing the same downhole efficiency and ground efficiency are added to further divide the efficiency evaluation diagram, and special effect areas, high-efficiency areas, standard-reaching areas, ground potential areas, wellbore potential areas, ground inefficiency areas, wellbore inefficiency areas and negative value areas are obtained, thereby realizing the preparation of the efficiency evaluation diagram. Since the points in the efficiency evaluation diagram can directly feedback the system efficiency, ground efficiency and downhole efficiency of the pumping system, the energy efficiency of the pumping system can be directly evaluated, and it can be determined whether there is a problem with the pumping system.

[0112] In an optional embodiment, the multiple regions in each of the efficiency evaluation graphs are divided in the following manner:

[0113] Marking the area where the system efficiency is ≥42% and ≤100%, the surface efficiency is ≥42% and ≤100%, and the downhole efficiency is ≥42% and ≤100% as the special effect area;

[0114] In this technical solution, the system efficiency is greater than or equal to 42% and less than or equal to 100%, indicating that the wellhead can produce oil at a very high efficiency, while the surface efficiency is greater than or equal to 42% and less than or equal to 100%, and the downhole efficiency is greater than or equal to 42% and less than or equal to 100%. This means that both the surface efficiency and the downhole efficiency are at a very high efficiency value, but when the downhole efficiency and the surface efficiency are at a high level at the same time, certain problems may arise. Therefore, the special effect area can also be called the data pending area, indicating that the wells in this area need to be further tested.

[0115] Marking the area where the system efficiency is ≥31% and ≤42%, the surface efficiency is ≥45% and ≤65%, and the downhole efficiency is ≥45% and ≤65% as the high-efficiency area;

[0116] Marking the area where the system efficiency is ≥20% and ≤31%, the surface efficiency is ≥45% and ≤65%, and the downhole efficiency is ≥45% and ≤65% as the standard-reaching area;

[0117] In the technical solution, when the point falls in the high-efficiency zone and the standard zone, it means that the well is in an efficient or normal working state. And the possibility of special circumstances is very small, which means that there is no problem with the equipment, and the oil reserves below are sufficient and very easy to exploit.

[0118] Marking the area where the system efficiency is ≥20% and ≤31%, the downhole efficiency is ≥45% and ≤100%, and the surface efficiency is ≥20% and ≤31% as the surface potential area;

[0119] In this technical solution, when the energy efficiency evaluation of the pumping system under inspection is a ground potential area, it means that the oil layer where the pumping system is located has potential, and the working parameters of the ground equipment are relatively small. The oil wells in this area are the main target wells for tapping potential and increasing oil production. Increasing the pumping parameters can increase the production of the oil wells.

[0120] Marking the area where the system efficiency is ≥20% and ≤31%, the surface efficiency is ≥45% and ≤100%, and the downhole efficiency is ≥20% and ≤31% as the wellbore potential area;

[0121] In this technical solution, when the energy efficiency evaluation of the inspected pumping system is a wellbore potential area, it means that the oil wells in this area should be diagnosed and comprehensively analyzed, and corresponding measures need to be formulated to restore normal production.

[0122] Marking the area where the system efficiency is ≥0% and ≤20%, the surface efficiency is ≥0% and ≤45%, and the downhole efficiency is ≥0% and ≤65% as the surface low-efficiency area;

[0123] In this technical solution, when the energy efficiency evaluation of the inspected oil pumping system is in the ground inefficiency area, it means that the selection of ground equipment is unreasonable and the equipment capacity needs to be coordinated with the wellbore production.

[0124] Marking the area where the system efficiency is ≥0% and ≤20%, the downhole efficiency is ≥0% and ≤45%, and the surface efficiency is ≥0% and ≤65% as the wellbore inefficient area;

[0125] In this technical solution, when the energy efficiency evaluation of the pumping system under inspection is in the low-efficiency zone of the wellbore, it means that the oil layer where the pumping system is located is insufficiently supplied with liquid and the pumping parameters are too large. It is necessary to take transformation measures for the oil layer, such as strengthening water injection or reducing the pumping parameters, so that the equipment's drainage capacity matches the oil layer's supply capacity.

[0126] The area where the system efficiency is ≤0%, the downhole efficiency is ≤0%, the surface efficiency is ≥0%, and ≤100% is marked as the negative value area.

[0127] In an optional embodiment, the above step S102 determines the surface efficiency according to the input power and polished rod power of the oil pumping system acquired in real time, including:

[0128] According to the input power and bare rod power of the pumping system, the surface efficiency is determined by the following formula:

[0129]

[0130] Where η s is the ground efficiency, N P is the polished rod power, N i is the input power;

[0131] The polished rod power N P Calculated by the following formula:

[0132]

[0133] Where W r ' is the weight of the sucker rod string in the pumped liquid, s is the stroke of the sucker rod string, and n is the number of strokes of the sucker rod string.

[0134] In this technical solution, the light rod power can also be determined by the pumping string. The pumping string is the device that actually inputs work into the well, so the light rod power can also be obtained by directly calculating the energy of the pumping string.

[0135] In an optional embodiment, the weight W of the sucker rod string in the pumped liquid is r ' is calculated by the following formula:

[0136] W r ′=q r (ρ s -ρ L ) r / ρ s ;

[0137] In the formula, q r is the mass of the sucker rod per meter, ρ s is the density of the sucker rod string, L r is the length of the sucker rod string, ρ L is the density of the liquid and g is the acceleration due to gravity.

[0138] In an optional embodiment, the calculation formula of the polished rod power is:

[0139] N P =A×S i ×F i ×n′ / 60000;

[0140] Where N P is the bare rod power, A is the dynamometer area, S i F is the reduction ratio of the dynamometer diagram, i is the power ratio of the dynamometer diagram, and n′ is the measured average number of strokes.

[0141] In this technical solution, the polished rod power can be calculated based on the dynamometer diagram. Since the polished rod power includes multiple devices, and each device has a certain efficiency coefficient, it is necessary to determine the polished rod efficiency directly from the working conditions of the polished rod, and the dynamometer diagram can directly represent the power transmitted from the ground equipment to the underground equipment. Therefore, the polished rod power can be calculated through the dynamometer diagram.

[0142] In an optional embodiment, the step S103 described above determines the downhole efficiency according to the effective power of the pumping system and the polished rod power obtained in real time, including:

[0143] According to the obtained effective power of the pumping system and the polished rod power, the downhole efficiency is determined by the following formula:

[0144]

[0145] Where η w is the downhole efficiency, N e is the effective power, N P is the bare rod power;

[0146] The effective power N e Calculated by the following formula:

[0147]

[0148] Where Q is the liquid production of the oil well, ρ is the liquid density, H is the effective head, and g is the acceleration of gravity.

[0149] In the above technical solution, the output of the oil well is the final output power of the oil well, so the effective power represents the final output power. The final effective efficiency can be obtained by calculating the oil well liquid production, liquid density, effective head and gravity acceleration. At the same time, the effective efficiency calculated in this way can show all the problems in the oil well and can better represent the problems of the oil well. In this way, the energy efficiency of the pumping system can be effectively evaluated.

[0150] In an optional embodiment, the effective lift H is calculated by the following formula:

[0151]

[0152] Where, L f is the distance between the moving liquid surface and the ground, p t is the oil pressure, p c is the casing pressure, ρ L is the density of the liquid and g is the acceleration due to gravity.

[0153] In an optional embodiment, the oil well liquid production Q is calculated by the following formula:

[0154] Q=1130.9733×D 2 ×s×n;

[0155] Where D is the diameter of the sucker pump, s is the stroke of the sucker rod string, and n is the number of strokes of the sucker rod string.

[0156] In an optional embodiment, the energy efficiency evaluation includes a system efficiency evaluation, and the energy efficiency evaluation result in S104 includes a system efficiency evaluation result;

[0157] Determining the energy efficiency evaluation result of the oil pumping system according to the surface efficiency, the downhole efficiency and the efficiency evaluation diagram of the oil pumping system in S104 above includes:

[0158] According to the surface efficiency and the downhole efficiency of the oil pumping system, a system efficiency point is obtained by projecting the points on the efficiency evaluation map; the target area where the system efficiency point is located is obtained, and the system efficiency evaluation result of the oil pumping system is determined according to the target area.

[0159] In this technical solution, after obtaining the surface efficiency of the pumping system and the downhole efficiency of the pumping system, the horizontal and vertical coordinates in the efficiency evaluation diagram are obtained. Since the product of the downhole efficiency and the surface efficiency is the system efficiency, a system efficiency point can be obtained in the efficiency evaluation diagram. Since the efficiency evaluation diagram has been partitioned, the target area where the system efficiency point is located can be directly determined, and then the system efficiency evaluation result of the pumping system can be determined according to the target area. Since different situations have been classified in the efficiency evaluation diagram, after determining the surface efficiency and downhole efficiency, the system efficiency evaluation result of the pumping system can be directly determined. Then, it is judged whether there is a problem with the pumping system, and it is directly judged whether the problem is with the surface equipment or the downhole equipment, so as to facilitate further inspection and maintenance.

[0160] In an optional embodiment, since the downhole efficiency and the surface efficiency can be intuitively fed back on the efficiency evaluation diagram, the downhole efficiency and the surface efficiency can also be evaluated, and different surface efficiencies and downhole efficiencies can intuitively feed back the problems of the pumping system. Figure 1 As shown, the method also includes:

[0161] S105. According to the predetermined reference value of the surface efficiency and the reference value of the downhole efficiency, the level of the surface efficiency and the level of the downhole efficiency are determined respectively as the secondary evaluation result of the oil pumping system; wherein the secondary evaluation result includes:

[0162] Ground efficiency special effect, or ground efficiency high, or ground efficiency meets the standard, or ground efficiency is low; and / or

[0163] Downhole efficiency special effect, or downhole efficiency high efficiency, or downhole efficiency meets the standard, or downhole efficiency is inefficient.

[0164] In this technical solution, the energy efficiency evaluation includes a secondary efficiency evaluation, and the secondary evaluation results include: special effects of ground efficiency, or high ground efficiency, or ground efficiency that meets the standard, or ground efficiency that is inefficient; and / or special effects of downhole efficiency, or high downhole efficiency, or downhole efficiency that meets the standard, or downhole efficiency that is inefficient. Since the downhole efficiency and ground efficiency can be intuitively fed back on the efficiency evaluation graph, the downhole efficiency and ground efficiency can also be evaluated, and different ground efficiencies and downhole efficiencies can intuitively feed back problems with the pumping system.

[0165] In an alternative embodiment, referring to Figure 1 As shown, the method further includes:

[0166] S106. Determine the cause of the abnormality according to the level of the surface efficiency and the level of the downhole efficiency.

[0167] The cause of the abnormality is determined according to the levels of surface efficiency and downhole efficiency, including: when the surface efficiency is very effective, it is determined that: the area of ​​the dynamometer diagram is too large; and / or the measured number of string strokes is too large; and / or the measured input power is too small; when the downhole efficiency is very effective, it is determined that: the liquid output is too large and the string lifting height is too high, resulting in excessive effective work; and / or the dynamometer diagram area and the measured number of string strokes are too small, resulting in small bare rod power; and / or excessive downhole efficiency caused by jetting; when the surface efficiency is inefficient, it is determined that: the motor efficiency is low; and / or the transmission efficiency of the belt and reduction box mechanism is low; and / or the four-bar efficiency is low; when the surface efficiency is inefficient, it is determined that: the packing efficiency is low; and / or the sucker rod efficiency is low; and / or the oil pump efficiency is low; and / or the string efficiency is low.

[0168] In this technical solution, the cause of the abnormality of each secondary evaluation result can be determined based on the secondary evaluation results of the oil pumping system, so that inspection and maintenance can be carried out in a more targeted manner.

[0169] In an optional embodiment, determining the abnormality cause according to the surface efficiency level and the downhole efficiency level includes:

[0170] Determine at the time of the ground efficiency effect:

[0171] The area of ​​the dynamometer diagram is greater than a first preset area threshold; and / or

[0172] The measured string stroke frequency is less than the first preset stroke frequency threshold; and / or

[0173] The measured input power is less than the preset input power threshold;

[0174] In the case of downhole efficiency effects, it is determined that:

[0175] The liquid output is greater than a preset liquid output threshold, the pipe string lifting height is greater than a preset height threshold, resulting in the effective work being greater than a preset threshold; and / or

[0176] The area of ​​the dynamometer diagram is smaller than the second preset area threshold, and the measured string strokes are smaller than the second preset strokes threshold, resulting in the polished rod power being smaller than the preset polished rod power threshold; and / or

[0177] The downhole efficiency caused by spraying and pumping is greater than the preset downhole efficiency threshold;

[0178] Determine when the ground efficiency is inefficient:

[0179] The motor efficiency is below a preset electrode efficiency threshold; and / or

[0180] The belt and reduction gearbox transmission efficiency is lower than the preset transmission power threshold; and / or

[0181] The four-bar linkage efficiency is lower than the preset linkage power threshold;

[0182] Determine when the ground efficiency is inefficient:

[0183] The packing efficiency is below a preset packing efficiency threshold; and / or

[0184] The sucker rod efficiency is below a preset sucker rod power threshold; and / or

[0185] The oil well pump efficiency is lower than a preset oil well pump efficiency threshold; and / or

[0186] The string efficiency is below the preset string efficiency threshold.

[0187] Those skilled in the art can set the above thresholds according to the actual situation of the oil pumping system, and no specific limitation is made here.

[0188] In this embodiment, the cause of the abnormality of each secondary evaluation result can be determined based on the secondary evaluation results of the oil pumping system, so as to perform inspection and maintenance in a more targeted manner.

[0189] The influence of ground factors on the efficiency of the pumping system includes:

[0190] (1) Motor influence

[0191] When the motor operates at or near the rated load, it is energy-saving and economical.

[0192] In order to meet the requirements of starting or maximum power point during operation, most pumping units (especially conventional beam pumping units) usually have a ratio of average output power to rated output power of their motors of 0.3 to 0.4, or even lower. Therefore, the motor is under light load most of the time in a stroke.

[0193] The maximum efficiency of the motor is 95%, but due to the uneven load of the pumping unit and the low power factor of the motor, the maximum efficiency of the motor in the pumping system can only reach η1 = 80%.

[0194] (2) Influence of belt drive

[0195] The transmission efficiency of belts commonly used in engineering is relatively high, up to 98%, that is, its transmission loss is only 2%. Compared with other types of belts, narrow V-belts have the lowest loss, the transmission efficiency is up to 98%, and the pulley diameter and width are significantly reduced. According to field measurements, the use of this transmission belt can save an average of 2.5% of electricity compared to the use of ordinary V-belts. Therefore, under the current technical conditions in my country, the potential for improving the efficiency of the belt transmission part is very small.

[0196] (3) Influence of reduction gearbox

[0197] Mainly the friction loss of bearings and gears.

[0198] The core issue is lubrication. If the lubrication effect is poor, not only will the energy consumption increase, but the bearings and gears will wear out quickly. Therefore, the lubrication of the bearings and gears in the reduction box must be ensured.

[0199] With good lubrication, the total loss of the reduction box is about 9% to 10%, that is, the transmission efficiency is about 90%.

[0200] Under the conditions of proper management and maintenance measures, the efficiency of the reduction gearbox will not be greatly improved.

[0201] (4) Influence of the four-bar linkage

[0202] There are three pairs of bearings and one wire rope. The main losses in this part are the friction loss between the relative moving parts and the deformation loss of the wire rope. The bearing loss is about 3%. The deformation loss of the wire rope is about 2%. If the lubrication and maintenance are good, the transmission efficiency of this part can generally reach 95%. Under the condition of a certain reversing mechanism, the efficiency of this part will not be greatly improved.

[0203] The maximum target value of ground efficiency is expressed as

[0204] η s =eta1eta2eta3=80%×98%×90%×95%=67%;

[0205] η1 is the motor efficiency, η2 is the belt drive efficiency, and η3 is the reduction box efficiency

[0206] (5) Influence of pumping unit balance

[0207] Improper balance adjustment of the pumping unit will increase the dynamic load on the pumping unit suspension point, which will not only affect the efficiency and life of the connecting rod mechanism, reduction box and motor, but also increase the energy consumption of the oil well and reduce the system efficiency.

[0208] (6) Impact of ground management and maintenance

[0209] Failure to perform timely ground lubrication and maintenance, drive belt adjustment, improper packing box adjustment, and excessive wellhead back pressure will reduce system efficiency.

[0210] 1.2 Impact of downhole factors on the efficiency of the pumping system

[0211] (1) Impact of packing box

[0212] The loss in this part is mainly friction loss, which is closely related to the installation of the oil pump, the surface processing quality of the bare rod, the tightness of the packing and the sealing material.

[0213] Field tests have shown that the use of standard polished rods and self-aligning graphite packing boxes with good sealing performance can significantly reduce friction and power loss.

[0214] Field tests have shown that packing boxes can affect system efficiency by 1% to 2%.

[0215] (2) Influence of sucker rod string

[0216] Friction loss is caused by the oil pipe and liquid column, and its value is related to the pump depth, well fluid viscosity, sucker rod movement speed, and the inclination and curvature of the oil well itself.

[0217] For oil wells with high well fluid viscosity, long stroke and low stroke conditions can be used to reduce the movement speed of the sucker rod; measures to reduce the viscosity of the well fluid can be adopted, such as injecting steam, mixing thin oil, and using electric heating of the sucker rod, so as to reduce the friction between the sucker rod column and the liquid column.

[0218] For oil wells with large well inclination or wellbore curvature, a centralizer or protective coupling can be installed on the sucker rod string to reduce friction loss between the rod and the pipe.

[0219] (3) Impact of the pipe string

[0220] The influence of the tubing string consists of two parts: volume loss and hydraulic loss.

[0221] Installing seals on the threads of the oil pipe to ensure the sealing of the oil pipe, strictly following the regulations when raising and lowering the oil pipe string to reduce or eliminate thread damage, can reduce the leakage of the pipe string and thus reduce the volume loss value.

[0222] The hydraulic loss of the pipe string is proportional to the roughness of the inner surface of the pipe string and the square of the upward flow velocity of the well fluid. Anti-corrosion or anti-scaling measures should be taken on the oil pipe to prevent the inner wall of the oil pipe from becoming rough. Large pump diameter, long stroke and low stroke frequency should be used as much as possible to reduce the upward flow velocity of the liquid.

[0223] (4) Influence of oil pump

[0224] Among the losses of the oil pump, volume loss and hydraulic loss account for the main part.

[0225] By optimizing the gap between the plunger pump barrel, the liquid loss can be reduced without increasing the friction of the plunger pump barrel.

[0226] The use of valve balls and valve seats that are wear-resistant and impact-resistant, have good switching performance, and low hydraulic loss can reduce leakage caused by pump and valve damage or untimely switching and reduce hydraulic resistance, thereby reducing energy consumption of the oil pump part.

[0227] As mentioned above, the downhole efficiency of the oil pumping system can be expressed as the product of the packing box efficiency, the sucker rod string efficiency, the pump efficiency and the tubing efficiency. When there is graphite lubrication, according to statistics, the maximum target values ​​of the efficiency of each node are packing box efficiency η4=90%, sucker rod string efficiency η5=90%, pump efficiency η6=80%, and tubing string efficiency η7=95%.

[0228] Therefore, the maximum target value of downhole efficiency is

[0229] η w =η4η5η6η7=90%×90%×80%×95%=62%

[0230] (5) Influence of sinking degree

[0231] The sinking degree is too small, the liquid volume is low, and the system efficiency is low

[0232] If the submergence is too large, the pump will be hung too deep, the weight of the rod will increase, the energy consumption will increase, and the system efficiency will be low.

[0233] (6) Influence of production parameters

[0234] Among the production parameters, oil well production, pump hanging depth, suspension point load difference, stroke and stroke frequency are the main factors affecting the downhole efficiency of oil wells, and they themselves are comprehensive indicators affected by various factors, and there is a correlation between them. For a specific oil well, under the conditions of certain ground equipment and oil well production capacity, different strokes, stroke frequencies, pump diameters, pump depths, and sucker rod string combinations have a greater impact on downhole efficiency. When the production, pump diameter, and pump hanging are determined, the relationship between stroke frequency and downhole efficiency is that as the stroke frequency increases, the lifting efficiency decreases. Therefore, long strokes and slow strokes are conducive to improving lifting efficiency.

[0235] There are three main problems in production design: the submergence of some oil wells is too large, the pump diameter is too small, and the number of strokes is too high. Therefore, in the production process, the oil pumping system should be scientifically and rationally designed in combination according to the conditions of ground equipment and production capacity, which is conducive to improving downhole efficiency.

[0236] The maximum target value η of the rod pumping system efficiency max =η s η w =67%×62%=41.5%.

[0237] In an optional embodiment, the energy efficiency evaluation method of the oil pumping system further includes: S107, determining the abnormal situation that occurred according to the cause of the abnormality.

[0238] Specifically, it includes: when the motor efficiency is low, it is determined that: the three-phase voltage is unbalanced, and / or the three-phase current is unbalanced, and / or the current suddenly drops, and / or the current suddenly rises, and / or the load rate is unreasonable; when the belt and reducer transmission efficiency is low, it is determined that: the belt slips, and / or the belt "four points and one line" is not adjusted in time, and / or the belt and reducer are not lubricated and maintained in time; when the four-link efficiency is low, it is determined that: the four-link is unbalanced, and / or the four-link is not lubricated and maintained in time; when the packing efficiency is low, it is determined that: the packing is too tight; the sucker rod efficiency is too tight; When the efficiency is low, it is determined: the sucker rod is eccentrically worn, and / or the sucker rod is broken, and / or the oil is thick; and / or wax is deposited, and / or the bare rod is not adjusted in time to ensure its centering rate; when the efficiency of the oil pump is low, it is determined: the oil pump is leaking, and / or the oil pump is stuck, and / or sand is produced, and / or the liquid supply is insufficient, and / or it is affected by gas, and / or it hits the pump; when the efficiency of the tubing is low, it is determined: the oil pipe in the tubing is leaking, and / or the stroke of the tubing, the number of tubing strokes, the pump diameter of the sucker pump, the pump lowering depth, and the sucker rod string combination are unreasonable.

[0239] In this technical solution, the actual abnormal situation of the abnormal cause can be determined based on the abnormal cause of the oil pumping system, so that inspection and maintenance can be carried out in a more targeted manner.

[0240] Embodiment 2

[0241] The embodiment of the present invention provides an energy efficiency evaluation system 200 for a pumping unit production system, which is used to implement an energy efficiency evaluation method for a pumping unit production system in any technical solution in the first embodiment, referring to Figure 3 As shown, including:

[0242] The efficiency evaluation diagram determination module 201 is used to establish an efficiency evaluation diagram based on the historical oil extraction data of the pumping unit production system; wherein the efficiency evaluation diagram includes a special effect area, a high efficiency area, a standard area, a surface potential area, a wellbore potential area, a surface inefficiency area, a wellbore inefficiency area and a negative value area;

[0243] The first calculation module 202 is used to determine the surface efficiency according to the input power and the polished rod power of the oil pumping system acquired in real time;

[0244] The second calculation module 203 is used to determine the downhole efficiency according to the effective power of the pumping unit system and the polished rod power obtained in real time;

[0245] The energy efficiency evaluation module 204 is used to determine the energy efficiency evaluation result of the oil pumping system according to the surface efficiency, the downhole efficiency and the efficiency evaluation diagram of the oil pumping system.

[0246] The energy efficiency evaluation system for the oil pumping system provided according to the technical solution of the present invention comprises: an efficiency evaluation diagram determination module, used to determine the efficiency evaluation diagram; a power calculation module, used to calculate the ground efficiency of the oil pumping system and the downhole efficiency of the oil pumping system; an energy efficiency evaluation module, which determines the energy efficiency evaluation of the oil pumping system according to the ground efficiency of the oil pumping system, the downhole efficiency of the oil pumping system and the efficiency evaluation diagram. At the same time, since the energy efficiency evaluation system for the oil pumping system of the present application can implement the steps defined in any of the above-mentioned energy efficiency evaluation methods for oil pumping systems, the energy efficiency evaluation system for the oil pumping system provided by the present technical solution has all the beneficial effects of the energy efficiency evaluation method for the oil pumping system provided in any of the above-mentioned technical solutions.

[0247] Embodiment 3

[0248] An embodiment of the present invention provides a computer-readable storage medium having a computer program stored thereon. When the program is executed by a processor, the energy efficiency evaluation method for an oil pumping system as described in any one of the aforementioned method embodiments is implemented.

[0249] The computer-readable storage medium may be included in the device / apparatus described in the above embodiment; or it may exist independently without being assembled into the device / apparatus. The above computer-readable storage medium carries one or more programs, and when the above one or more programs are executed, the method according to the embodiment of the present invention is implemented.

[0250] According to an embodiment of the present invention, the computer-readable storage medium may be a non-volatile computer-readable storage medium, for example, may include but is not limited to: a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof. In the present invention, the computer-readable storage medium may be any tangible medium containing or storing a program, which may be used by or in combination with an instruction execution system, apparatus, or device.

[0251] Embodiment 4

[0252] An embodiment of the present invention provides an electronic device, referring to Figure 4 As shown, it includes a processor 111, a communication interface 112, a memory 113 and a communication bus 114, wherein the processor 111, the communication interface 112 and the memory 113 communicate with each other through the communication bus 114.

[0253] Memory 113, used for storing computer programs;

[0254] The processor 111 is used to implement the energy efficiency evaluation method of the oil pumping system as described in any one of the above method embodiments when executing the program stored in the memory 113.

[0255] The implementation principle and technical effect of the electronic device provided by the embodiment of the present invention are similar to those of any of the aforementioned method embodiments, and will not be repeated here.

[0256] The above-mentioned memory 113 can be an electronic memory such as a flash memory, an EEPROM (electrically erasable programmable read-only memory), an EPROM, a hard disk or a ROM. The memory 113 has a storage space for program codes for executing any method steps in the above-mentioned method. For example, the storage space for program codes may include various program codes for implementing various steps in the above method respectively. These program codes can be read from or written into one or more computer program products. These computer program products include program code carriers such as hard disks, compact disks (CDs), memory cards or floppy disks. Such computer program products are usually portable or fixed storage units. The storage unit may have a storage segment or storage space arranged similarly to the memory 113 in the above-mentioned electronic device. The program code can be compressed, for example, in an appropriate form. Generally, the storage unit includes a program for executing the method steps according to an embodiment of the present invention, that is, a code that can be read by, for example, a processor 111, and when these codes are run by an electronic device, the electronic device performs the various steps in the method described above.

[0257] In this document, relational terms such as first and second, etc. are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. The orientation or position relationship indicated by the terms "upper", "lower", etc. is based on the orientation or position relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0258] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict. The present invention is not limited to any single aspect, any single embodiment, or any combination and / or permutation of these aspects and / or embodiments. Each aspect and / or embodiment of the present invention can be used alone, or in combination with one or more other aspects and / or other embodiments.

[0259] Finally, it should be noted that the above-described embodiments are only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention is described in detail with reference to the above-described embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-described embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A method for evaluating the energy efficiency of an oil pumping system, characterized in that: include: Based on the historical oil extraction data of the pumping system, an efficiency evaluation diagram is established; wherein the efficiency evaluation diagram includes a special effect area, a high efficiency area, a standard area, a ground potential area, a wellbore potential area, a ground inefficient area, a wellbore inefficient area and a negative value area; Determine the surface efficiency based on the real-time input power and bare rod power of the pumping system; Determine the downhole efficiency according to the effective power of the pumping unit system and the polished rod power obtained in real time; The energy efficiency evaluation result of the oil pumping unit production system is determined according to the surface efficiency, the downhole efficiency and the efficiency evaluation diagram of the oil pumping unit production system.

2. The energy efficiency evaluation method of the oil pumping system according to claim 1 is characterized in that: The efficiency evaluation diagram is established based on the historical oil extraction data of the oil pumping system; A plane rectangular coordinate system is established with downhole efficiency as the horizontal axis and surface efficiency as the vertical axis; Projecting the historical oil extraction data of the oil pumping system on the coordinate system, connecting the points with the same system efficiency on the coordinate system, and obtaining a system efficiency curve; wherein the system efficiency curve divides the coordinate system into a plurality of regions; A plurality of straight lines representing the same downhole efficiency and ground efficiency are added to the coordinate system to further divide the plurality of regions, and a corresponding system efficiency value is marked on each of the system efficiency curves. Each divided region is named according to the system efficiency value and a pre-established regional division rule to obtain the efficiency evaluation diagram.

3. The energy efficiency evaluation method of the oil pumping system according to claim 1 is characterized in that: Determining the surface efficiency according to the input power and polished rod power of the oil pumping system acquired in real time includes: According to the input power and bare rod power of the oil pumping system, the surface efficiency is determined by the following formula: Where η s is the ground efficiency, N P is the polished rod power, N i is the input power; The polished rod power N P Calculated by the following formula: Where W r ' is the weight of the sucker rod string in the pumped liquid, s is the stroke of the sucker rod string, and n is the number of strokes of the sucker rod string.

4. The energy efficiency evaluation method of the oil pumping system according to claim 3 is characterized in that: The weight W of the sucker rod string in the pumped liquid r ' is calculated by the following formula: W r ′=q r (r s -r L )gL r / r s ; In the formula, q r is the mass of the sucker rod per meter, ρ s is the density of the sucker rod string, L r is the length of the sucker rod string, ρ L is the density of the liquid and g is the acceleration due to gravity.

5. The energy efficiency evaluation method of the oil pumping system according to claim 1 is characterized in that: Determining the downhole efficiency according to the effective power of the oil pumping system and the polished rod power obtained in real time includes: According to the obtained effective power of the pumping system and the polished rod power, the downhole efficiency is determined by the following formula: Where η w is the downhole efficiency, N e is the effective power, N P is the bare rod power; The effective power N e Calculated by the following formula: Where Q is the liquid production of the oil well, ρ is the liquid density, H is the effective head, and g is the acceleration of gravity.

6. The energy efficiency evaluation method of the oil pumping system according to claim 5 is characterized in that: The effective head H is calculated by the following formula: Where, L f is the distance between the moving liquid surface and the ground, p t is the oil pressure, p c is the casing pressure, ρ L is the density of the liquid and g is the acceleration due to gravity.

7. The energy efficiency evaluation method of the oil pumping system according to claim 5 is characterized in that: The oil well liquid production Q is calculated by the following formula: Q=1130.9733×D 2 ×s×n; Where D is the diameter of the sucker pump, s is the stroke of the sucker rod string, and n is the number of strokes of the sucker rod string.

8. The energy efficiency evaluation method of the oil pumping system according to claim 2 is characterized in that: The multiple regions in each efficiency evaluation diagram are divided in the following manner: Marking the area where the system efficiency is ≥42% and ≤100%, the surface efficiency is ≥42% and ≤100%, and the downhole efficiency is ≥42% and ≤100% as the special effect area; Marking the area where the system efficiency is ≥31% and ≤42%, the surface efficiency is ≥45% and ≤65%, and the downhole efficiency is ≥45% and ≤65% as the high-efficiency area; Marking the area where the system efficiency is ≥20% and ≤31%, the surface efficiency is ≥45% and ≤65%, and the downhole efficiency is ≥45% and ≤65% as the standard-reaching area; Marking the area where the system efficiency is ≥20% and ≤31%, the downhole efficiency is ≥45% and ≤100%, and the surface efficiency is ≥20% and ≤31% as the surface potential area; Marking the area where the system efficiency is ≥20% and ≤31%, the surface efficiency is ≥45% and ≤100%, and the downhole efficiency is ≥20% and ≤31% as the wellbore potential area; Marking the area where the system efficiency is ≥0% and ≤20%, the surface efficiency is ≥0% and ≤45%, and the downhole efficiency is ≥0% and ≤65% as the surface low-efficiency area; Marking the area where the system efficiency is ≥0% and ≤20%, the downhole efficiency is ≥0% and ≤45%, and the surface efficiency is ≥0% and ≤65% as the wellbore inefficient area; The area where the system efficiency is ≤0%, the downhole efficiency is ≤0%, the surface efficiency is ≥0%, and ≤100% is marked as the negative value area.

9. The energy efficiency evaluation method of the oil pumping system according to claim 1 is characterized in that: The energy efficiency evaluation results include system efficiency evaluation results; Determining the energy efficiency evaluation result of the oil pumping system according to the surface efficiency, the downhole efficiency and the efficiency evaluation diagram of the oil pumping system comprises: According to the surface efficiency and the downhole efficiency of the oil pumping system, a point is projected on the efficiency evaluation graph to obtain a system efficiency point; The target area where the system efficiency point is located is obtained, and the system efficiency evaluation result of the oil pumping system is determined according to the target area.

10. The energy efficiency evaluation method of the oil pumping system according to claim 1, characterized in that: The method further comprises: According to the predetermined reference value of the surface efficiency and the reference value of the downhole efficiency, the level of the surface efficiency and the level of the downhole efficiency are determined respectively as the secondary evaluation result of the pumping unit production system; wherein the secondary evaluation result includes: Ground efficiency special effect, or ground efficiency high, or ground efficiency meets the standard, or ground efficiency is low; and / or Downhole efficiency special effect, or downhole efficiency high efficiency, or downhole efficiency meets the standard, or downhole efficiency is inefficient.

11. The energy efficiency evaluation method of the oil pumping system according to claim 10, characterized in that: The method further includes determining a cause of an abnormality based on the level of the surface efficiency and the level of the downhole efficiency.

12. The energy efficiency evaluation method of the oil pumping system according to claim 11, characterized in that: The determining of the abnormality cause according to the level of the surface efficiency and the level of the downhole efficiency includes: Determine at the time of the ground efficiency effect: The area of ​​the dynamometer diagram is greater than a first preset area threshold; and / or The measured string stroke frequency is less than the first preset stroke frequency threshold; and / or The measured input power is less than the preset input power threshold; In the case of downhole efficiency effects, it is determined that: The liquid output is greater than a preset liquid output threshold, the pipe string lifting height is greater than a preset height threshold, resulting in the effective work being greater than a preset threshold; and / or The area of ​​the dynamometer diagram is smaller than the second preset area threshold, and the measured string strokes are smaller than the second preset strokes threshold, resulting in the polished rod power being smaller than the preset polished rod power threshold; and / or The downhole efficiency caused by spraying and pumping is greater than the preset downhole efficiency threshold; Determine when the ground efficiency is inefficient: The motor efficiency is below a preset electrode efficiency threshold; and / or The belt and reduction gearbox transmission efficiency is lower than the preset transmission power threshold; and / or The four-bar linkage efficiency is lower than the preset linkage power threshold; Determine when the ground efficiency is inefficient: The packing efficiency is below a preset packing efficiency threshold; and / or The sucker rod efficiency is below a preset sucker rod power threshold; and / or The oil well pump efficiency is lower than a preset oil well pump efficiency threshold; and / or The string efficiency is below the preset string efficiency threshold.

13. An energy efficiency evaluation system for a pumping unit production system, characterized in that: include: An efficiency evaluation diagram determination module is used to establish an efficiency evaluation diagram based on historical oil extraction data of the pumping unit production system; wherein the efficiency evaluation diagram includes a special effect area, a high efficiency area, a standard-reaching area, a ground potential area, a wellbore potential area, a ground inefficiency area, a wellbore inefficiency area and a negative value area; The first calculation module is used to determine the surface efficiency according to the input power and the bare rod power of the oil pumping system acquired in real time; The second calculation module is used to determine the downhole efficiency according to the effective power of the oil pumping system and the polished rod power obtained in real time; The energy efficiency evaluation module is used to determine the energy efficiency evaluation result of the oil pumping system according to the surface efficiency, the downhole efficiency and the efficiency evaluation diagram of the oil pumping system.

14. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the energy efficiency evaluation method of the oil pumping system according to any one of claims 1 to 12 is implemented.

15. An electronic device, characterized in that: It includes a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory communicate with each other via the communication bus; Memory, used to store computer programs; The processor is used to implement the energy efficiency evaluation method of the oil pumping system as described in any one of claims 1 to 12 when executing the program stored in the memory.

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