Oil well fault identification method, device and equipment based on screw pump and medium

Abstract

The embodiment of the invention discloses an oil well fault recognition method, device and equipment based on a screw pump and a medium. The method comprises the following steps: acquiring target parameter information of a target oil well; wherein the target parameter information comprises screw pump operation information and screw pump calibration information, and the screw pump operation information comprises the actually measured liquid production capacity and the actually measured current value of the target oil well; the theoretical liquid production capacity of the target oil well is determined according to the target parameter information, and the liquid production capacity difference value is determined according to the theoretical liquid production capacity and the actually-measured liquid production capacity; determining a theoretical current value of the target oil well according to the target parameter information, and determining a current difference value according to the theoretical current value and the actually measured current value; and determining the fault type of the target oil well according to the change trend of the liquid production capacity difference value and the current difference value. According to the technical scheme, the oil well fault type can be rapidly and accurately identified based on the change trend of the liquid production capacity difference value and the current difference value, subsequent operation measures can be guided, and the oil field operation cost can be reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of fault diagnosis, and in particular to a method, device, equipment and medium for identifying oil well faults based on a screw pump. Background Art

[0002] The screw pump consists of a stator and a rotor, and the medium is transmitted through the rotation of the rotor. Compared with other oil production methods, the screw pump system has the advantages of simple structure, low initial equipment investment, easy installation, high efficiency and energy saving, and a wide range of applications. It has been rapidly developed and widely used in oil fields at home and abroad.

[0003] During operation, the screw pump system may experience various faults such as wax plugging, stator swelling, tubing leakage, tubing breakage, shaft breakage, etc. Among all fault types, wax plugging and stator swelling are more common, and the two faults are similar in system operation characteristic parameters, but the treatment methods are completely different. Wax plugging does not require the use of the tubing, and the problem can be solved by wax cleaning operations. Swelling requires the downhole tubing to be pulled out and the stator to be replaced. Accurate identification of the two fault types can effectively guide subsequent operation measures and reduce oilfield operation costs. Summary of the invention

[0004] The present invention provides an oil well fault identification method, device, equipment and medium based on a screw pump, which can quickly and accurately identify the fault type of the oil well based on the changing trend of the liquid production difference and the current difference, help guide subsequent operation measures, and reduce oil field operation costs.

[0005] According to one aspect of the present invention, a method for identifying oil well faults based on a screw pump is provided, the method comprising:

[0006] Acquire target parameter information of the target oil well; wherein the target parameter information includes screw pump operation information and screw pump calibration information, and the screw pump operation information includes the measured liquid production and the measured current value of the target oil well;

[0007] Determine the theoretical liquid production of the target oil well according to the target parameter information, and determine the liquid production difference according to the theoretical liquid production and the measured liquid production;

[0008] Determine a theoretical current value of the target oil well according to the target parameter information, and determine a current difference value according to the theoretical current value and the measured current value;

[0009] The fault type of the target oil well is determined according to the variation trends of the liquid production difference and the current difference; wherein the fault type includes wax plugging of the oil pipe and swelling of the stator of the screw pump.

[0010] According to another aspect of the present invention, there is provided an oil well fault identification device based on a screw pump, comprising:

[0011] A target parameter information acquisition module, used to acquire target parameter information of a target oil well; wherein the target parameter information includes screw pump operation information and screw pump calibration information, and the screw pump operation information includes the measured liquid production and the measured current value of the target oil well;

[0012] A liquid production difference determination module, used to determine the theoretical liquid production of the target oil well according to the target parameter information, and determine the liquid production difference according to the theoretical liquid production and the measured liquid production;

[0013] A current difference determination module, used to determine a theoretical current value of the target oil well according to the target parameter information, and to determine a current difference according to the theoretical current value and the measured current value;

[0014] The oil well fault type determination module is used to determine the fault type of the target oil well according to the change trends of the liquid production difference and the current difference; wherein the fault types include wax plugging of the oil pipe and swelling of the stator of the screw pump.

[0015] According to another aspect of the present invention, an electronic device is provided, the electronic device comprising:

[0016] at least one processor; and

[0017] a memory communicatively connected to the at least one processor; wherein,

[0018] The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the oil well fault identification method based on a screw pump as described in any embodiment of the present invention.

[0019] According to another aspect of the present invention, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the oil well fault identification method based on a screw pump as described in any embodiment of the present invention when executed.

[0020] The technical solution of the embodiment of the present invention obtains the target parameter information of the target oil well; wherein the target parameter information includes the screw pump operation information and the screw pump calibration information, and the screw pump operation information includes the measured liquid production and the measured current value of the target oil well; the theoretical liquid production of the target oil well is determined according to the target parameter information, and the liquid production difference is determined according to the theoretical liquid production and the measured liquid production; the theoretical current value of the target oil well is determined according to the target parameter information, and the current difference is determined according to the theoretical current value and the measured current value; the fault type of the target oil well is determined according to the changing trend of the liquid production difference and the current difference; wherein the fault type includes wax plugging of the oil pipe and swelling of the screw pump stator. This technical solution can quickly and accurately identify the fault type of the oil well based on the changing trend of the liquid production difference and the current difference, which is helpful to guide subsequent operation measures and reduce oilfield operation costs.

[0021] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of 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.

[0023] Figure 1 is a flow chart of an oil well fault identification method based on a screw pump provided according to the first embodiment of the present invention;

[0024] Figure 2A is a schematic diagram of changes in the difference in oil well liquid production and current difference provided in accordance with the first embodiment of the present invention;

[0025] Figure 2B is another schematic diagram of changes in the difference in oil well liquid production and current difference provided in accordance with the first embodiment of the present invention;

[0026] Figure 3 is a prediction result diagram of oil well parameters provided according to the first embodiment of the present invention;

[0027] Figure 4 is a flow chart of an oil well fault identification method based on a screw pump according to the second embodiment of the present invention;

[0028] Figure 5 2 is a schematic diagram of the structure of an oil well fault identification device based on a screw pump according to Embodiment 3 of the present invention;

[0029] Figure 6 It is a structural schematic diagram of an electronic device for implementing an oil well fault identification method based on a screw pump according to an embodiment of the present invention. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0031] It should be noted that the terms "first", "second", "target", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0032] Embodiment 1

[0033] Figure 1 This is a flowchart of a method for identifying oil well faults based on a screw pump provided in the first embodiment of the present invention. This embodiment is applicable to the situation of quickly and accurately identifying oil well faults based on a screw pump. The method can be executed by an oil well fault identification device based on a screw pump. The oil well fault identification device based on a screw pump can be implemented in the form of hardware and / or software. The oil well fault identification device based on a screw pump can be configured in an electronic device with data processing capabilities. Figure 1 As shown, the method includes:

[0034] S110, obtaining target parameter information of the target oil well; wherein the target parameter information includes screw pump operation information and screw pump calibration information, and the screw pump operation information includes the measured liquid production and the measured current value of the target oil well.

[0035] Among them, the target oil well may refer to an oil well waiting for fault detection. The screw pump operation information may refer to the parameter information generated by the screw pump during operation. Among them, the screw pump operation information can be measured by different types of sensors. Exemplarily, the screw pump operation information may include the measured liquid production of the target oil well (i.e. the actual measured liquid production), the measured current value (i.e. the actual measured current value), the screw pump inlet pressure (which can be determined based on the bottom hole pressure) and the oil pipe outlet pressure, etc. The screw pump calibration information may refer to the attribute parameter information calibrated by the screw pump when it leaves the factory. Exemplarily, the screw pump calibration information may include the rotor diameter, stator lead and eccentricity of the screw pump, etc.

[0036] S120, determining the theoretical liquid production of the target oil well according to the target parameter information, and determining the liquid production difference according to the theoretical liquid production and the measured liquid production.

[0037] In this embodiment, after obtaining the target parameter information of the target oil well, the theoretical liquid production of the target oil well can be determined according to the target parameter information. Optionally, determining the theoretical liquid production of the target oil well according to the target parameter information includes: determining the flow friction coefficient between the oil pipe and the well fluid according to the pipe diameter and the pipe roughness height of the oil pipe in the target oil well; determining the oil pipe pressure gradient according to the flow friction coefficient, the well inclination angle, the average density of the well fluid, the mass of the oil-water mixture produced per unit volume, and the measured liquid production; determining the screw pump pressure difference according to the oil pipe pressure gradient and the bottom hole pressure, and determining the theoretical liquid production of the target oil well according to the screw pump pressure difference.

[0038] For example, we can first use the formula Calculate the flow friction coefficient between the oil pipe and the well fluid. Among them, Ra is the roughness height of the oil pipe, d is the diameter of the oil pipe, Re2 is the gas-liquid two-phase Reynolds number, and λ represents the flow friction coefficient between the oil pipe and the well fluid. Then, through the formula Determine the pressure gradient of the oil flow pipe. represents the tubing pressure gradient, ΔP represents the tubing pressure change, Δh represents the tubing depth change, is the average density of the well fluid, g is the gravitational acceleration, α is the well inclination angle, q0 is the measured fluid production, W t is the mass of oil-water mixture produced per unit volume (i.e. the total mass of oil-water mixture produced simultaneously with unit volume of ground degassed crude oil), and D is the rotor diameter.

[0039] After the tubing pressure gradient is determined, the screw pump pressure difference can be determined according to the tubing pressure gradient and the bottom hole pressure. Optionally, determining the screw pump pressure difference according to the tubing pressure gradient and the bottom hole pressure includes: determining the tubing inlet pressure according to the tubing pressure gradient and the tubing outlet pressure; determining the screw pump outlet pressure according to the tubing inlet pressure, and determining the screw pump inlet pressure according to the bottom hole pressure; wherein the tubing inlet is connected to the screw pump outlet, and the screw pump is located at the bottom of the target oil well; and determining the screw pump pressure difference according to the difference between the screw pump outlet pressure and the screw pump inlet pressure.

[0040] In this embodiment, the outlet pressure of the oil pipe can be measured by a pressure sensor placed at the outlet of the oil pipe, and then the pressure gradient of the oil pipe can be calculated. The change in tubing pressure ΔP is determined by the change in tubing depth Δh. When the tubing outlet pressure and tubing pressure change are known, the outlet pressure of the tubing can be quickly determined. Since the tubing inlet is connected to the screw pump outlet, the screw pump outlet pressure is equal to the tubing inlet pressure. Since the screw pump is located at the bottom of the target oil well, the bottom hole pressure can be measured by a pressure sensor placed at the bottom of the well. At this time, the bottom hole pressure is the screw pump inlet pressure. Then, the screw pump inlet pressure is subtracted from the screw pump outlet pressure, and the screw pump pressure difference can be obtained based on the subtraction result.

[0041] After determining the screw pump pressure difference, the theoretical liquid production of the target oil well can be further determined based on the screw pump pressure difference. Optionally, determining the theoretical liquid production of the target oil well based on the screw pump pressure difference includes: determining the first candidate liquid production of the target oil well based on the calibration mapping relationship of the screw pump and the screw pump pressure difference; wherein the calibration mapping relationship is used to describe the corresponding relationship between the screw pump pressure difference and the water production at the calibration speed; correcting the first candidate liquid production based on the screw pump speed to obtain the second candidate liquid production; and correcting the second candidate liquid production based on the well fluid viscosity of the target oil well to obtain the theoretical liquid production of the target oil well.

[0042] The calibration mapping relationship may refer to a mapping relationship that is calibrated when the screw pump leaves the factory, and may be used to describe the corresponding relationship between the screw pump pressure difference and the water output at the calibration speed. The calibration speed may refer to a pre-calibrated screw pump speed, such as 300r / m.

[0043] In this embodiment, after determining the screw pump pressure difference, the calibration mapping relationship of the screw pump can be found based on the screw pump pressure difference, and the water production corresponding to the screw pump pressure difference can be determined from the calibration mapping relationship as the first candidate liquid production of the target oil well. Since the calibration mapping relationship describes the corresponding relationship under the calibration speed, and the calibration speed may be different from the actual speed of the screw pump. Therefore, in order to ensure the accuracy of the liquid production, it is necessary to correct the first candidate liquid production according to the screw pump speed to obtain the second candidate liquid production. Exemplarily, the formula Q2=Q t×(n / n t ) to correct the first candidate liquid production. t is the first candidate liquid production, Q2 is the second candidate liquid production, n t is the calibration speed, and n is the screw pump speed. Since the calibration mapping relationship describes the correspondence between the screw pump pressure difference and the water production, and the actual oil production process may collect oil-water mixture. Therefore, in order to ensure the accuracy of the liquid production, it is necessary to correct the second candidate liquid production according to the well fluid viscosity of the target oil well to obtain the theoretical liquid production of the target oil well. For example, the formula Q3 = Q2-(Q2-Q t )(σ t / σ3) to correct the second candidate liquid production. Where Q3 is the theoretical liquid production, σ t is the viscosity of water, and σ3 is the viscosity of well fluid.

[0044] After determining the theoretical liquid production of the target oil well, the liquid production difference can be determined based on the theoretical liquid production and the measured liquid production. Specifically, the theoretical liquid production and the measured liquid production are subtracted (it can be the theoretical liquid production minus the measured liquid production, or it can be the measured liquid production minus the theoretical liquid production, without limitation), and the liquid production difference can be obtained based on the subtraction result. It should be noted that the liquid production difference here includes both size and positive and negative.

[0045] S130, determining a theoretical current value of the target oil well according to the target parameter information, and determining a current difference according to the theoretical current value and the measured current value.

[0046] In this embodiment, after obtaining the target parameter information of the target oil well, the theoretical current value of the target oil well can also be determined according to the target parameter information. Optionally, determining the theoretical current value of the target oil well according to the target parameter information includes: determining the theoretical rotation torque of the screw pump according to the rotor diameter, stator lead, eccentricity, friction torque and screw pump pressure difference of the screw pump; determining the theoretical current value of the target oil well according to the angular velocity, rated voltage, rated efficiency, power factor and theoretical rotation torque of the screw pump.

[0047] For example, we can first use the formula Calculate the theoretical rotation torque of the screw pump. Among them, M is the theoretical rotation torque, M0 is the friction torque, e is the eccentricity, D is the rotor diameter, T is the stator lead, and Δp is the screw pump pressure difference. Then use the formula Calculate the theoretical current value of the target oil well. Where I is the theoretical current value, ω is the angular velocity of the screw pump, and U N is the rated voltage, η M is the rated efficiency, is the power factor.

[0048] S140, determining the fault type of the target oil well according to the change trend of the difference in liquid production and the difference in current; wherein the fault types include wax plugging of the oil pipe and swelling of the stator of the screw pump.

[0049] In this embodiment, after determining the difference in liquid production and the difference in current, the fault type of the target oil well can be determined according to the changing trends of the difference in liquid production and the difference in current. Optionally, the fault type of the target oil well is determined according to the changing trends of the difference in liquid production and the difference in current, including: if the changing trend of the difference in liquid production is decreasing, and the changing trend of the difference in current is increasing, then the fault type of the target oil well is determined to be wax plugging of the oil pipe; if the changing trends of the difference in liquid production and the difference in current are both increasing, then the fault type of the target oil well is determined to be swelling of the stator of the screw pump.

[0050] Figure 2A This is a schematic diagram of the change of the difference in oil well production and current provided in the first embodiment of the present invention. Figure 2A As shown, the changes in the difference in liquid production and the difference in current of Well 1# within 25 days are shown. It can be seen that the trend of the difference in liquid production of Well 1# is decreasing, and the trend of the difference in current is increasing. Therefore, it can be determined that the fault type of Well 1# is wax plugging of the tubing. Figure 2B This is another schematic diagram of the change of the oil well liquid production difference and the current difference provided in the first embodiment of the present invention. Figure 2B As shown in the figure, the changes in the difference in liquid production and the difference in current of Well 2# within 25 days are shown. It can be seen that the change trends of the difference in liquid production and the difference in current of Well 2# are both stable fluctuations within a certain range, so it can be determined that Well 2# does not have a fault. Among them, whether the change trend is rising, falling or fluctuating can be determined based on the pre-set difference fluctuation range, and the difference fluctuation range can be set according to actual application requirements.

[0051] Furthermore, the technical solution can also predict the current value, liquid production and bottom hole pressure of the oil well in the future days based on the historical data of the oil well. Taking the current value prediction as an example, a function curve fitting can be performed on the measured current values ​​of the oil well in the historical days in chronological order, and the current value in the future days can be predicted based on the curve fitting result. Among them, the historical days and the future days can be set according to actual needs. Figure 3 This is a prediction result diagram of oil well parameters provided in Example 1 of the present invention. The data before the dotted line is historical data, and the data after the dotted line is predicted data. Figure 3 As shown in the figure, taking the current value prediction as an example, a function fitting can be performed on the historical current values ​​from the 18th to the 30th day to obtain the predicted current values ​​from the 31st to the 45th day. It should be noted that the closer to the actual time node, the higher the accuracy of the parameter prediction result; the farther from the actual time node, the worse the accuracy of the parameter prediction result.

[0052] The technical solution of the embodiment of the present invention obtains the target parameter information of the target oil well; wherein the target parameter information includes the screw pump operation information and the screw pump calibration information, and the screw pump operation information includes the measured liquid production and the measured current value of the target oil well; the theoretical liquid production of the target oil well is determined according to the target parameter information, and the liquid production difference is determined according to the theoretical liquid production and the measured liquid production; the theoretical current value of the target oil well is determined according to the target parameter information, and the current difference is determined according to the theoretical current value and the measured current value; the fault type of the target oil well is determined according to the changing trend of the liquid production difference and the current difference; wherein the fault type includes wax plugging of the oil pipe and swelling of the screw pump stator. This technical solution can quickly and accurately identify the fault type of the oil well based on the changing trend of the liquid production difference and the current difference, which is helpful to guide subsequent operation measures and reduce oilfield operation costs.

[0053] Embodiment 2

[0054] Figure 4 A flow chart of a method for identifying oil well faults based on a screw pump is provided in the second embodiment of the present invention. This embodiment is optimized based on the above embodiment. The specific optimization is as follows: after obtaining the target parameter information of the target oil well, it also includes: removing abnormal data from the screw pump operation information in the target parameter information; correspondingly, determining the theoretical liquid production of the target oil well according to the target parameter information, including: determining the theoretical liquid production of the target oil well according to the target parameter information after the abnormal data is removed; determining the theoretical current value of the target oil well according to the target parameter information, including: determining the theoretical current value of the target oil well according to the target parameter information after the abnormal data is removed.

[0055] like Figure 4 As shown, the method of this embodiment specifically includes the following steps:

[0056] S210, obtaining target parameter information of the target oil well; wherein the target parameter information includes screw pump operation information and screw pump calibration information, and the screw pump operation information includes the measured liquid production and the measured current value of the target oil well.

[0057] S220, eliminating abnormal data from the screw pump operation information in the target parameter information.

[0058] In the actual detection process, affected by the detection environment, the measured screw pump operation information may contain abnormal data points that deviate from the normal measurement range, which will interfere with the identification of oil well faults. In order to improve the accuracy of oil well fault identification, after obtaining the target parameter information of the target oil well, the screw pump operation information in the target parameter information can be eliminated for abnormal data. Specifically, the reference measurement range can be pre-set according to the actual measurement requirements. If the measured screw pump operation information contains data that exceeds the reference measurement range, it can be judged as abnormal data and the abnormal data can be eliminated from the screw pump operation information, thereby ensuring the rationality of the detection data.

[0059] S230, determining the theoretical liquid production of the target oil well according to the target parameter information after the abnormal data is eliminated, and determining the liquid production difference according to the theoretical liquid production and the measured liquid production.

[0060] S240, determining a theoretical current value of the target oil well according to the target parameter information after the abnormal data is eliminated, and determining a current difference according to the theoretical current value and the measured current value.

[0061] S250, determining the fault type of the target oil well according to the change trend of the difference in liquid production and the difference in current; wherein the fault types include wax plugging of the oil pipe and swelling of the stator of the screw pump.

[0062] Among them, the specific implementation method of S230-S250 can refer to the detailed description in S120-S140, which will not be repeated here.

[0063] The technical solution of the embodiment of the present invention, after obtaining the target parameter information of the target oil well, removes abnormal data from the screw pump operation information in the target parameter information; determines the theoretical liquid production of the target oil well according to the target parameter information after the abnormal data is removed, and determines the liquid production difference according to the theoretical liquid production and the measured liquid production; determines the theoretical current value of the target oil well according to the target parameter information after the abnormal data is removed, and determines the current difference according to the theoretical current value and the measured current value; determines the fault type of the target oil well according to the change trend of the liquid production difference and the current difference; wherein the fault type includes wax plugging of the oil pipe and swelling of the screw pump stator. This technical solution can quickly and accurately identify the fault type of the oil well based on the change trend of the liquid production difference and the current difference, which helps to guide subsequent operation measures and reduce the cost of oil field operations. By removing the abnormal data points that deviate from the normal measurement range in the screw pump operation information, the rationality of the detection data can be ensured, and the data measurement abnormality caused by the influence of the detection environment is avoided, which helps to improve the accuracy of oil well fault identification.

[0064] Embodiment 3

[0065] Figure 5This is a schematic diagram of the structure of a screw pump-based oil well fault identification device provided in the third embodiment of the present invention. The device can execute the screw pump-based oil well fault identification method provided in any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of the execution method. Figure 5 As shown, the device comprises:

[0066] The target parameter information acquisition module 310 is used to acquire the target parameter information of the target oil well; wherein the target parameter information includes the screw pump operation information and the screw pump calibration information, and the screw pump operation information includes the measured liquid production and the measured current value of the target oil well;

[0067] A liquid production difference determination module 320, configured to determine the theoretical liquid production of the target oil well according to the target parameter information, and to determine the liquid production difference according to the theoretical liquid production and the measured liquid production;

[0068] A current difference determination module 330, configured to determine a theoretical current value of the target oil well according to the target parameter information, and determine a current difference according to the theoretical current value and the measured current value;

[0069] The oil well fault type determination module 340 is used to determine the fault type of the target oil well according to the change trends of the liquid production difference and the current difference; wherein the fault types include wax plugging of the oil pipe and swelling of the stator of the screw pump.

[0070] Optionally, the liquid production difference determination module includes:

[0071] A flow friction coefficient determination unit, used to determine the flow friction coefficient between the oil pipe and the well fluid according to the pipe diameter and the pipe roughness height of the oil pipe in the target oil well;

[0072] A tubing pressure gradient determination unit, used to determine the tubing pressure gradient according to the flow friction coefficient, the well inclination angle, the average density of the well fluid, the mass of the oil-water mixture produced per unit volume and the measured fluid production;

[0073] The theoretical liquid production determination unit is used to determine the screw pump pressure difference according to the oil pipe pressure gradient and the bottom hole pressure, and determine the theoretical liquid production of the target oil well according to the screw pump pressure difference.

[0074] Optionally, the theoretical liquid production determination unit is used to:

[0075] Determine the oil pipe inlet pressure according to the oil pipe pressure gradient and the oil pipe outlet pressure;

[0076] Determine the screw pump outlet pressure according to the oil pipe inlet pressure, and determine the screw pump inlet pressure according to the bottom hole pressure; wherein the oil pipe inlet is connected to the screw pump outlet, and the screw pump is located at the bottom of the target oil well;

[0077] The screw pump pressure difference is determined according to the difference between the screw pump outlet pressure and the screw pump inlet pressure.

[0078] Optionally, the theoretical liquid production determination unit is further used to:

[0079] Determine the first candidate liquid production of the target oil well according to the calibration mapping relationship of the screw pump and the screw pump pressure difference; wherein the calibration mapping relationship is used to describe the corresponding relationship between the screw pump pressure difference and the water production at the calibrated speed;

[0080] Correcting the first candidate liquid production according to the rotation speed of the screw pump to obtain a second candidate liquid production;

[0081] The second candidate liquid production is corrected according to the well fluid viscosity of the target oil well to obtain the theoretical liquid production of the target oil well.

[0082] Optionally, the current difference determination module is used to:

[0083] Determine the theoretical rotation torque of the screw pump according to the rotor diameter, stator lead, eccentricity, friction torque and pressure difference of the screw pump;

[0084] The theoretical current value of the target oil well is determined according to the angular velocity, rated voltage, rated efficiency, power factor and the theoretical rotation torque of the screw pump.

[0085] Optionally, the oil well fault type determination module is used to:

[0086] If the change trend of the liquid production difference is decreasing, and the change trend of the current difference is increasing, then it is determined that the fault type of the target oil well is wax blockage of the oil pipe;

[0087] If the change trends of the liquid production difference and the current difference are both increasing, it is determined that the fault type of the target oil well is the swelling of the screw pump stator.

[0088] Optionally, the device further comprises:

[0089] An abnormal data elimination module is used to eliminate abnormal data from the screw pump operation information in the target parameter information;

[0090] Correspondingly, the liquid production difference determination module is also used for:

[0091] Determine the theoretical liquid production of the target oil well according to the target parameter information after the abnormal data is eliminated;

[0092] The current difference determination module is further used for:

[0093] The theoretical current value of the target oil well is determined according to the target parameter information after the abnormal data is eliminated.

[0094] An oil well fault identification device based on a screw pump provided in an embodiment of the present invention can execute an oil well fault identification method based on a screw pump provided in any embodiment of the present invention, and has functional modules and beneficial effects corresponding to the execution method.

[0095] Embodiment 4

[0096] Figure 6 A schematic diagram of the structure of an electronic device 10 that can be used to implement an embodiment of the present invention is shown. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices (such as helmets, glasses, watches, etc.) and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present invention described and / or required herein.

[0097] like Figure 6 As shown, the electronic device 10 includes at least one processor 11, and a memory connected to the at least one processor 11, such as a read-only memory (ROM) 12, a random access memory (RAM) 13, etc., wherein the memory stores a computer program that can be executed by at least one processor, and the processor 11 can perform various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 12 or the computer program loaded from the storage unit 18 to the random access memory (RAM) 13. In the RAM 13, various programs and data required for the operation of the electronic device 10 can also be stored. The processor 11, the ROM 12, and the RAM 13 are connected to each other through a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0098] A number of components in the electronic device 10 are connected to the I / O interface 15, including: an input unit 16, such as a keyboard, a mouse, etc.; an output unit 17, such as various types of displays, speakers, etc.; a storage unit 18, such as a disk, an optical disk, etc.; and a communication unit 19, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 19 allows the electronic device 10 to exchange information / data with other devices through a computer network such as the Internet and / or various telecommunication networks.

[0099] The processor 11 may be a variety of general and / or special processing components with processing and computing capabilities. Some examples of the processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various special artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any appropriate processor, controller, microcontroller, etc. The processor 11 executes the various methods and processes described above, such as an oil well fault identification method based on a screw pump.

[0100] In some embodiments, the oil well fault identification method based on the screw pump can be implemented as a computer program, which is tangibly contained in a computer-readable storage medium, such as a storage unit 18. In some embodiments, part or all of the computer program can be loaded and / or installed on the electronic device 10 via the ROM 12 and / or the communication unit 19. When the computer program is loaded into the RAM 13 and executed by the processor 11, one or more steps of the oil well fault identification method based on the screw pump described above can be performed. Alternatively, in other embodiments, the processor 11 can be configured to execute the oil well fault identification method based on the screw pump by any other appropriate means (for example, by means of firmware).

[0101] Various implementations of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on chips (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various implementations can include: being implemented in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which can be a special purpose or general purpose programmable processor that can receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit data and instructions to the storage system, the at least one input device, and the at least one output device.

[0102] Computer programs for implementing the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, so that when the computer program is executed by the processor, the functions / operations specified in the flow chart and / or block diagram are implemented. The computer program may be executed entirely on the machine, partially on the machine, partially on the machine and partially on a remote machine as a stand-alone software package, or entirely on a remote machine or server.

[0103] In the context of the present invention, a computer-readable storage medium may be a tangible medium that may contain or store a computer program for use by or in combination with an instruction execution system, device or equipment. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices or equipment, or any suitable combination of the foregoing. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. A more specific example of a machine-readable storage medium may include an electrical connection based on one or more lines, 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), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0104] To provide interaction with a user, the systems and techniques described herein may be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and a pointing device (e.g., a mouse or trackball) through which the user can provide input to the electronic device. Other types of devices may also be used to provide interaction with the user; for example, the feedback provided to the user may be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form (including acoustic input, voice input, or tactile input).

[0105] The systems and techniques described herein may be implemented in a computing system that includes backend components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes frontend components (e.g., a user computer with a graphical user interface or a web browser through which a user can interact with implementations of the systems and techniques described herein), or a computing system that includes any combination of such backend components, middleware components, or frontend components. The components of the system may be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: a local area network (LAN), a wide area network (WAN), a blockchain network, and the Internet.

[0106] A computing system may include a client and a server. The client and the server are generally remote from each other and usually interact through a communication network. The client and server relationship is generated by computer programs running on the corresponding computers and having a client-server relationship with each other. The server may be a cloud server, also known as a cloud computing server or cloud host, which is a host product in the cloud computing service system to solve the defects of difficult management and weak business scalability in traditional physical hosts and VPS services.

[0107] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0108] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for identifying oil well faults based on a screw pump, characterized in that: The method comprises: Acquire target parameter information of the target oil well; wherein the target parameter information includes screw pump operation information and screw pump calibration information, and the screw pump operation information includes the measured liquid production and the measured current value of the target oil well; Determine the theoretical liquid production of the target oil well according to the target parameter information, and determine the liquid production difference according to the theoretical liquid production and the measured liquid production; Determine a theoretical current value of the target oil well according to the target parameter information, and determine a current difference value according to the theoretical current value and the measured current value; The fault type of the target oil well is determined according to the variation trends of the liquid production difference and the current difference; wherein the fault type includes wax plugging of the oil pipe and swelling of the stator of the screw pump.

2. The method according to claim 1, characterized in that Determining the theoretical liquid production of the target oil well according to the target parameter information includes: Determining the flow friction coefficient between the oil pipe and the well fluid according to the pipe diameter and the pipe roughness height of the target oil well; Determining the tubing pressure gradient according to the flow friction coefficient, the well inclination angle, the average density of the well fluid, the mass of the oil-water mixture produced per unit volume and the measured fluid production; The screw pump pressure difference is determined according to the oil pipe pressure gradient and the bottom hole pressure, and the theoretical liquid production of the target oil well is determined according to the screw pump pressure difference.

3. The method according to claim 2, characterized in that Determining the screw pump pressure difference according to the tubing pressure gradient and the bottom hole pressure includes: Determine the oil pipe inlet pressure according to the oil pipe pressure gradient and the oil pipe outlet pressure; Determine the screw pump outlet pressure according to the oil pipe inlet pressure, and determine the screw pump inlet pressure according to the bottom hole pressure; wherein the oil pipe inlet is connected to the screw pump outlet, and the screw pump is located at the bottom of the target oil well; The screw pump pressure difference is determined according to the difference between the screw pump outlet pressure and the screw pump inlet pressure.

4. The method according to claim 2, characterized in that: Determining the theoretical liquid production of the target oil well according to the screw pump pressure difference includes: Determine the first candidate liquid production of the target oil well according to the calibration mapping relationship of the screw pump and the screw pump pressure difference; wherein the calibration mapping relationship is used to describe the corresponding relationship between the screw pump pressure difference and the water production at the calibrated speed; Correcting the first candidate liquid production according to the rotation speed of the screw pump to obtain a second candidate liquid production; The second candidate liquid production is corrected according to the well fluid viscosity of the target oil well to obtain the theoretical liquid production of the target oil well.

5. The method according to claim 2 or 3, characterized in that: Determining the theoretical current value of the target oil well according to the target parameter information includes: Determine the theoretical rotation torque of the screw pump according to the rotor diameter, stator lead, eccentricity, friction torque and pressure difference of the screw pump; The theoretical current value of the target oil well is determined according to the angular velocity, rated voltage, rated efficiency, power factor and the theoretical rotation torque of the screw pump.

6. The method according to claim 1, characterized in that Determining the fault type of the target oil well according to the change trends of the liquid production difference and the current difference includes: If the change trend of the liquid production difference is decreasing, and the change trend of the current difference is increasing, then it is determined that the fault type of the target oil well is wax blockage of the oil pipe; If the change trends of the liquid production difference and the current difference are both increasing, it is determined that the fault type of the target oil well is the swelling of the screw pump stator.

7. The method according to claim 1, characterized in that After obtaining target parameter information of the target oil well, the method further includes: Eliminating abnormal data from the screw pump operation information in the target parameter information; Accordingly, determining the theoretical liquid production of the target oil well according to the target parameter information includes: Determine the theoretical liquid production of the target oil well according to the target parameter information after the abnormal data is eliminated; Determining the theoretical current value of the target oil well according to the target parameter information includes: The theoretical current value of the target oil well is determined according to the target parameter information after the abnormal data is eliminated.

8. An oil well fault identification device based on a screw pump, characterized in that: The device comprises: A target parameter information acquisition module, used to acquire target parameter information of a target oil well; wherein the target parameter information includes screw pump operation information and screw pump calibration information, and the screw pump operation information includes the measured liquid production and the measured current value of the target oil well; A liquid production difference determination module, used to determine the theoretical liquid production of the target oil well according to the target parameter information, and determine the liquid production difference according to the theoretical liquid production and the measured liquid production; A current difference determination module, used to determine a theoretical current value of the target oil well according to the target parameter information, and to determine a current difference according to the theoretical current value and the measured current value; The oil well fault type determination module is used to determine the fault type of the target oil well according to the change trends of the liquid production difference and the current difference; wherein the fault types include wax plugging of the oil pipe and swelling of the stator of the screw pump.

9. The device according to claim 8, characterized in that The liquid production difference determination module includes: A flow friction coefficient determination unit, used to determine the flow friction coefficient between the oil pipe and the well fluid according to the pipe diameter and the pipe roughness height of the oil pipe in the target oil well; A tubing pressure gradient determination unit, used to determine the tubing pressure gradient according to the flow friction coefficient, the well inclination angle, the average density of the well fluid, the mass of the oil-water mixture produced per unit volume and the measured fluid production; The theoretical liquid production determination unit is used to determine the screw pump pressure difference according to the oil pipe pressure gradient and the bottom hole pressure, and determine the theoretical liquid production of the target oil well according to the screw pump pressure difference.

10. The device according to claim 9, characterized in that The theoretical liquid production determination unit is used to: Determine the oil pipe inlet pressure according to the oil pipe pressure gradient and the oil pipe outlet pressure; Determine the screw pump outlet pressure according to the oil pipe inlet pressure, and determine the screw pump inlet pressure according to the bottom hole pressure; wherein the oil pipe inlet is connected to the screw pump outlet, and the screw pump is located at the bottom of the target oil well; The screw pump pressure difference is determined according to the difference between the screw pump outlet pressure and the screw pump inlet pressure.

11. The device according to claim 9, characterized in that The theoretical liquid production determination unit is also used for: Determine the first candidate liquid production of the target oil well according to the calibration mapping relationship of the screw pump and the screw pump pressure difference; wherein the calibration mapping relationship is used to describe the corresponding relationship between the screw pump pressure difference and the water production at the calibrated speed; Correcting the first candidate liquid production according to the rotation speed of the screw pump to obtain a second candidate liquid production; The second candidate liquid production is corrected according to the well fluid viscosity of the target oil well to obtain the theoretical liquid production of the target oil well.

12. The device according to claim 9 or 10, characterized in that The current difference determination module is used to: Determine the theoretical rotation torque of the screw pump according to the rotor diameter, stator lead, eccentricity, friction torque and pressure difference of the screw pump; The theoretical current value of the target oil well is determined according to the angular velocity, rated voltage, rated efficiency, power factor and the theoretical rotation torque of the screw pump.

13. The device according to claim 8, characterized in that The oil well fault type determination module is used to: If the change trend of the liquid production difference is decreasing, and the change trend of the current difference is increasing, then it is determined that the fault type of the target oil well is wax blockage of the oil pipe; If the change trends of the liquid production difference and the current difference are both increasing, it is determined that the fault type of the target oil well is the swelling of the screw pump stator.

14. The device according to claim 8, characterized in that The device also includes: An abnormal data elimination module is used to eliminate abnormal data from the screw pump operation information in the target parameter information; Correspondingly, the liquid production difference determination module is also used for: Determine the theoretical liquid production of the target oil well according to the target parameter information after the abnormal data is eliminated; The current difference determination module is further used for: The theoretical current value of the target oil well is determined according to the target parameter information after the abnormal data is eliminated.

15. An electronic device, characterized in that: The electronic device comprises: at least one processor; and a memory communicatively connected to the at least one processor; wherein, The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the oil well fault identification method based on a screw pump according to any one of claims 1-7.

16. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the oil well fault identification method based on a screw pump according to any one of claims 1 to 7 when executed.

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