Method and system for judging operation condition of oil pumping unit

Abstract

The invention discloses an operation condition judgment method and system for an oil pumping unit. The method comprises the steps that displacement information of the oil pumping unit to be judged in a current complete stroke period is collected; displacement information of a first time period and displacement information of a second time period are extracted according to the displacement information of the complete stroke period, and the suspension point movement speed characteristic of the sucker rod is calculated by combining the duration from the initial moment of the first time period to the end moment of the second time period so as to judge whether the pumping unit to be judged is a beam pumping unit or not, the first time period is any one of a plurality of identical continuous time periods divided by the complete stroke period, and the second time period is a time period which is not adjacent to the first time period and is located after the first time period; when it is judged that the pumping unit is a beam-pumping unit, the position of the pumping rod is analyzed through the displacement information of the first time period, when the pumping rod reaches the top dead center position, the out-of-phase angle of the pumping unit and the suspension point movement duration of the pumping rod are calculated, and the operation working condition is obtained based on the out-of-phase angle and the suspension point movement duration. According to the invention, the operation condition of the oil pumping unit can be accurately judged.

Description

Technical Field

[0001] The invention belongs to the technical field of oil pumping well operating condition detection, and in particular relates to an operating condition determination method and system for an oil pumping unit. Background Art

[0002] An oil pump is a mechanical device that converts the continuous circular motion of the prime mover into reciprocating linear motion and drives the oil pump to pump oil through the sucker rod.

[0003] The most widely used pumping unit at present is the conventional walking beam pumping unit, which is mainly composed of a donkey head, a walking beam, a cross beam, a connecting rod, a crank, a counterweight, a reducer, a pulley and an electric motor. The working principle of the conventional walking beam pumping unit is that the motor drives the reducer input shaft to rotate at a high speed through a belt. After the reducer gear is decelerated, the reducer output shaft drives the crank to rotate at a low speed. The rotation of the crank is transmitted to the up and down reciprocating motion of the downhole pump through the connecting rod, the cross beam, the walking beam, the donkey head, the suspension rope and other parts, thereby sucking the underground crude oil to the ground. The conventional walking beam pumping unit has the advantages of being strong and durable, highly reliable, easy to manufacture parts and components, and a wide range of applicable working conditions, but it also has the disadvantages of many transmission links, high energy consumption, negative torque, low efficiency, and large volume and weight.

[0004] The basic structure of the out-of-phase beam pumping unit is the same as that of the conventional beam pumping unit, except that there is a non-zero angle between the crank centerline of the out-of-phase beam pumping unit and the line connecting the center of gravity of the counterweight and the center of rotation. In other words, the phase angle between the crank centerline of the out-of-phase beam pumping unit and the line connecting the center of gravity of the counterweight and the center of rotation is not zero, while the phase angle between the crank centerline of the conventional beam pumping unit and the line connecting the center of gravity of the counterweight and the center of rotation is zero, and the crankshaft is a certain distance away from the tail of the beam pumping unit. This structure makes the upstroke speed of the out-of-phase beam pumping unit slow and the downstroke speed fast, reducing the peak torque and producing a certain energy-saving effect.

[0005] The informatization construction of oil fields has brought about changes in the management mechanism of oil wells, realized unattended and remote monitoring of oil wells, reduced the labor intensity of employees, improved production efficiency, and reduced labor. At the same time, the real-time collection of parameters such as wellhead temperature, pressure, indicator diagram, and electric power provides a reliable basis for the formulation of a well-by-well policy and provides effective data support for fine daily management. However, with the continuous advancement of digital oil wells and information management, the number of on-site management and operation and maintenance personnel of oil wells has dropped significantly, and the requirements for fine management of oil wells have gradually increased. The existing oil wells only monitor dynamic data such as daily liquid production, power consumption, oil casing and temperature, and the integrity management of oil well equipment is still imperfect. From the perspective of the active power of the pumping well, the net torque of the reducer output shaft of the pumping unit has negative torque, violent fluctuations, and large peak torque, which is bound to increase the consumption of active input power; from the perspective of reactive power, the net torque of the reducer output shaft of the pumping unit fluctuates violently and has a large peak torque, so it is necessary to use a high-power motor and a high-torque reducer, which is bound to increase the consumption of reactive power. This is the phenomenon of "big horse pulling a small cart". When the out-of-phase walking beam pumping unit rotates forward, the upstroke speed is slow and the downstroke speed is fast. The peak torque is reduced to achieve the purpose of energy saving. Therefore, the pumping unit model and operation mode are related to the installation method and energy-saving operation of the pumping unit well dynamic equipment.

[0006] With the comprehensive construction of digital oil well management mechanism and the substantial reduction in the number of management personnel, oil fields fail to update static data such as machine models in a timely manner and rely on manual judgment of the operation mode of pumping wells through videos. There are problems such as large workload and inaccurate understanding of machine models. There may even be problems such as incorrect installation of the reduction gearbox due to incorrect machine models and operation modes, which in turn lead to equipment operation failures. The machine models and operation modes of pumping wells rely solely on manual identification and entry, but there are few staff members and the oil well data is huge, and the accuracy, authenticity and real-time nature of data identification cannot be guaranteed. More seriously, it will lead to oil well operation failures, affect production, cause economic losses, and may also affect the safety and environmental protection of the oil field. Therefore, there is an urgent need for a technology and method for automatic detection of the out-of-phase angle and operating conditions of the pumping unit. Summary of the invention

[0007] In order to solve the above problems, an embodiment of the present invention provides a method for determining the operating condition of an oil pumping unit, comprising: collecting displacement information of the oil pumping unit to be determined within the current complete stroke cycle; extracting the displacement information of the first time period and the second time period according to the displacement information of the complete stroke cycle, and calculating the suspension point movement speed characteristics of the sucker rod in combination with the duration between the initial moment of the first time period and the end moment of the second time period, so as to determine whether the oil pumping unit to be determined is a walking beam pumping unit, wherein the first time period is any time period in a plurality of identical continuous time periods into which the complete stroke cycle is divided, and the second time period is a time period that is non-adjacent to the first time period and is located after the first time period; when it is determined to be a walking beam pumping unit, the displacement information of the first time period is used to analyze the position of the sucker rod, and when the sucker rod reaches the top dead center position, the out-of-phase angle of the oil pumping unit to be determined and the suspension point movement duration of the sucker rod are calculated, based on which the operating condition of the current oil pumping unit is obtained.

[0008] Preferably, in the step of calculating the suspension point movement speed characteristics of the sucker rod to determine whether the pumping unit to be determined is a walking beam pumping unit, it includes: selecting different time periods within the complete stroke cycle as first time periods and calculating the suspension point movement speed characteristics corresponding to each first time period; determining whether the pumping unit to be determined is a walking beam pumping unit by analyzing and comparing the suspension point movement speed characteristics corresponding to each first time period, wherein when the suspension point movement speed characteristics corresponding to each first time period are not completely the same, the pumping unit to be determined is determined to be a walking beam pumping unit, otherwise, the pumping unit to be determined is determined to be a belt conveyor.

[0009] Preferably, the suspension point motion speed characteristic is the suspension point motion average speed, wherein the suspension point motion average speed is calculated using the following expression:

[0010]

[0011] Among them, V i represents the average speed of the suspension point during the i-th period, PR i represents the displacement of the ith period, PR (i+2) represents the displacement of the i+2th period, T N Indicates the running time of the sucker rod in each period.

[0012] Preferably, the step of analyzing the sucker rod position using the displacement information of the first time period includes: determining whether the sucker rod has reached the top dead center position by analyzing and comparing the displacement of the first time period with a preset displacement threshold, wherein the preset displacement threshold is obtained based on the displacement change characteristics of the walking beam pump within a complete stroke cycle during the historical operation process.

[0013] Preferably, in the step of calculating the out-of-phase angle of the pumping unit to be determined and the duration of the suspension point movement of the sucker rod, and based on this, obtaining the operating condition of the current pumping unit, the step includes: obtaining the out-of-phase angle using the total duration of the sucker rod of the pumping unit to be determined from the bottom dead center to the top dead center, and the number of time periods corresponding to the complete stroke cycle; determining whether the pumping unit to be determined is an out-of-phase type pumping unit based on the out-of-phase angle, wherein when it is determined to be an out-of-phase type pumping unit, the operating state of the pumping unit crank used to generate the operating condition is obtained by using the ratio of the upward movement duration to the downward movement duration in the suspension point movement duration of the sucker rod.

[0014] Preferably, in the process of determining whether the pumping unit to be determined is an out-of-phase type pumping unit according to the out-of-phase angle, it includes: if the out-of-phase angle is zero, determining that the pumping unit to be determined is a conventional pumping unit, otherwise, determining that the pumping unit to be determined is an out-of-phase type pumping unit.

[0015] Preferably, the out-of-phase angle is calculated using the following expression:

[0016]

[0017] Where α represents the phase difference angle, i top It represents the total time for the sucker rod to reach the top dead center from the bottom dead center, and n represents the number of time periods.

[0018] Preferably, when it is determined to be an out-of-phase type oil pumping unit, the process of obtaining the operating state of the oil pumping unit crank for generating the operating condition by utilizing the ratio of the upward movement duration and the downward movement duration in the suspension point movement duration of the sucker rod includes: if the ratio of the upward movement duration to the downward movement duration is less than 1, and the upward movement duration is less than the downward movement duration, then the operating state of the oil pumping unit crank is determined to be reverse, and the reverse state is used as the operating condition of the current oil pumping unit; if the ratio of the upward movement duration to the downward movement duration is greater than 1, and the upward movement duration is greater than the downward movement duration, then the operating state of the oil pumping unit crank is determined to be forward, and the forward state is used as the operating condition of the current oil pumping unit.

[0019] Preferably, in the process of dividing the complete stroke cycle into a plurality of identical continuous time periods, the number of the divided time periods is between 150 and 300.

[0020] On the other hand, the present invention also provides an operating condition determination system for an oil pumping unit, the operating condition determination system comprising the following modules: a displacement information acquisition module, which is used to acquire displacement information of the oil pumping unit to be determined within the current complete stroke cycle; a beam pumping unit determination module, which is used to extract the displacement information of the first time period and the second time period according to the displacement information of the complete stroke cycle, and calculate the suspension point movement speed characteristics of the pumping rod in combination with the time length between the initial moment of the first time period and the end moment of the second time period, so as to determine whether the oil pumping unit to be determined is a beam pumping unit, wherein the first time period is any time period of a plurality of identical continuous time periods into which the complete stroke cycle is divided, and the second time period is a time period that is non-adjacent to the first time period and is located after the first time period; an operating condition determination module, which is used to analyze the position of the pumping rod using the displacement information of the first time period when determining that it is a beam pumping unit, and when the pumping rod reaches the top dead center position, calculate the out-of-phase angle of the oil pumping unit to be determined and the suspension point movement duration of the pumping rod, based on which, obtain the operating condition of the current oil pumping unit.

[0021] Compared with the prior art, one or more embodiments of the above scheme may have the following advantages or beneficial effects:

[0022] The present invention proposes a method and system for determining the operating condition of an oil pump. The method uses the displacement information of the oil pump to be determined in the current complete stroke cycle to analyze the phase angle characteristics of the oil pump to be determined, and realizes automatic detection of the model and operating mode of the oil pump to be determined based on the phase angle characteristic analysis results. The present invention realizes automatic identification of the model and operating mode of the oil pump to be determined by detecting and comprehensively judging the out-of-phase angle of the displacement variable, solves the problem that the model and operating mode of the digital oil pump of the oil well cannot be automatically identified, is suitable for the automated operation and maintenance and information management of digital oil wells, and can guide the implementation of energy-saving measures for oil pump wells.

[0023] 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 can be realized and obtained by the structures particularly pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0025] Figure 1 It is a step diagram of a method for determining an operating condition of an oil pump according to an embodiment of the present application.

[0026] Figure 2It is a schematic diagram of a belt conveyor suspension point displacement curve of a method for determining an operating condition of an oil pumping unit according to an embodiment of the present application.

[0027] Figure 3 It is a schematic diagram of a conventional walking beam machine suspension point displacement curve for a method for determining an operating condition of an oil pumping unit according to an embodiment of the present application.

[0028] Figure 4 It is a schematic diagram of the forward rotation suspension point displacement curve of the out-of-phase walking beam machine used in the operating condition determination method of the oil pumping unit in the embodiment of the present application.

[0029] Figure 5 It is a schematic diagram of the inversion suspension point displacement curve of the out-of-phase walking beam machine used in the operating condition determination method of the oil pumping unit in the embodiment of the present application.

[0030] Figure 6 It is the first example diagram of the suspension point displacement curve of the out-of-phase walking beam machine used in the operating condition determination method of the oil pumping unit according to the embodiment of the present application.

[0031] Figure 7 It is a second example diagram of the suspension point displacement curve of the out-of-phase walking beam machine used in the method for determining the operating condition of the oil pumping unit according to an embodiment of the present application.

[0032] Figure 8 It is a module block diagram of an operating condition determination system for an oil pumping unit according to an embodiment of the present application. DETAILED DESCRIPTION

[0033] The following will describe the implementation methods of the present invention in detail with reference to the accompanying drawings and embodiments, so that the implementation process of how the present invention applies technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly. It should be noted that as long as there is no conflict, the various embodiments of the present invention and the various features in the embodiments can be combined with each other, and the technical solutions formed are all within the protection scope of the present invention.

[0034] In addition, the steps shown in the flowcharts of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although a logical order is shown in the flowcharts, in some cases, the steps shown or described can be performed in an order different from that shown here.

[0035] An oil pump is a mechanical device that converts the continuous circular motion of the prime mover into reciprocating linear motion and drives the oil pump to pump oil through the sucker rod.

[0036] The most widely used pumping unit at present is the conventional walking beam pumping unit, which is mainly composed of a donkey head, a walking beam, a cross beam, a connecting rod, a crank, a counterweight, a reducer, a pulley and an electric motor. The working principle of the conventional walking beam pumping unit is that the motor drives the reducer input shaft to rotate at a high speed through a belt. After the reducer gear is decelerated, the reducer output shaft drives the crank to rotate at a low speed. The rotation of the crank is transmitted to the up and down reciprocating motion of the downhole pump through the connecting rod, the cross beam, the walking beam, the donkey head, the suspension rope and other parts, thereby sucking the underground crude oil to the ground. The conventional walking beam pumping unit has the advantages of being strong and durable, highly reliable, easy to manufacture parts and components, and a wide range of applicable working conditions, but it also has the disadvantages of many transmission links, high energy consumption, negative torque, low efficiency, and large volume and weight.

[0037] The basic structure of the out-of-phase beam pumping unit is the same as that of the conventional beam pumping unit, except that there is a non-zero angle between the crank centerline of the out-of-phase beam pumping unit and the line connecting the center of gravity of the counterweight and the center of rotation. In other words, the phase angle between the crank centerline of the out-of-phase beam pumping unit and the line connecting the center of gravity of the counterweight and the center of rotation is not zero, while the phase angle between the crank centerline of the conventional beam pumping unit and the line connecting the center of gravity of the counterweight and the center of rotation is zero, and the crankshaft is a certain distance away from the tail of the beam pumping unit. This structure makes the upstroke speed of the out-of-phase beam pumping unit slow and the downstroke speed fast, reducing the peak torque and producing a certain energy-saving effect.

[0038] The informatization construction of oil fields has brought about changes in the management mechanism of oil wells, realized unattended and remote monitoring of oil wells, reduced the labor intensity of employees, improved production efficiency, and reduced labor. At the same time, the real-time collection of parameters such as wellhead temperature, pressure, indicator diagram, and electric power provides a reliable basis for the formulation of a well-by-well policy and provides effective data support for fine daily management. However, with the continuous advancement of digital oil wells and information management, the number of on-site management and operation and maintenance personnel of oil wells has dropped significantly, and the requirements for fine management of oil wells have gradually increased. The existing oil wells only monitor dynamic data such as daily liquid production, power consumption, oil casing and temperature, and the integrity management of oil well equipment is still imperfect. From the perspective of the active power of the pumping well, the net torque of the reducer output shaft of the pumping unit has negative torque, violent fluctuations, and large peak torque, which is bound to increase the consumption of active input power; from the perspective of reactive power, the net torque of the reducer output shaft of the pumping unit fluctuates violently and has a large peak torque, so it is necessary to use a high-power motor and a high-torque reducer, which is bound to increase the consumption of reactive power. This is the phenomenon of "big horse pulling a small cart". When the out-of-phase walking beam pumping unit rotates forward, the upstroke speed is slow and the downstroke speed is fast. The peak torque is reduced to achieve the purpose of energy saving. Therefore, the pumping unit model and operation mode are related to the installation method and energy-saving operation of the pumping unit well dynamic equipment.

[0039] With the comprehensive construction of digital oil well management mechanism and the substantial reduction in the number of management personnel, oil fields fail to update static data such as machine models in a timely manner and rely on manual judgment of the operation mode of pumping wells through videos. There are problems such as large workload and inaccurate understanding of machine models. There may even be problems such as incorrect installation of the reduction gearbox due to incorrect machine models and operation modes, which in turn lead to equipment operation failures. The machine models and operation modes of pumping wells rely solely on manual identification and entry, but there are few staff members and the oil well data is huge, and the accuracy, authenticity and real-time nature of data identification cannot be guaranteed. More seriously, it will lead to oil well operation failures, affect production, cause economic losses, and may also affect the safety and environmental protection of the oil field. Therefore, there is an urgent need for a technology and method for automatic detection of the out-of-phase angle and operating conditions of the pumping unit.

[0040] Therefore, in order to solve the above problems, the present invention proposes a method and system for determining the operating condition of an oil pumping unit. The method uses the displacement information of the oil pumping unit to be determined in the current complete stroke cycle to analyze the phase angle characteristics of the oil pumping unit to be determined, and realizes automatic detection of the model and operation mode of the oil pumping unit to be determined according to the phase angle characteristic analysis results. The present invention realizes the automatic identification of the model and operation mode of the oil pumping unit to be determined by detecting and comprehensively judging the phase angle of the displacement variable, solves the problem that the model and operation mode of the digital oil pumping unit in the oil well cannot be automatically identified, is suitable for the automatic operation and maintenance and information management of digital oil wells, and can guide the implementation of energy-saving measures for oil pumping wells. At the same time, the present invention solves the problem that the model and operation condition of the oil pumping well rely on manual input, solves the problem that the accuracy, authenticity and real-time nature of the data cannot be guaranteed due to the small number of personnel and the huge amount of oil well data, prevents the oil well operation failure that may be caused by the wrong model information, avoids the impact on production, oil field safety, and environmental protection, and avoids economic losses. The present invention realizes automatic detection of the out-of-phase angle, machine type and operating conditions of the oil pumping unit, greatly reduces the workload of manual data entry for tens of thousands of oil pumping wells in the oil field, improves the accuracy and real-time nature of the data, ensures the digitization of the integrity management of the oil well equipment, and brings great economic benefits and application convenience.

[0041] Embodiment 1

[0042] Figure 1 1 is a step diagram of the method for determining the operating condition of an oil pumping unit according to an embodiment of the present application. Figure 1 To illustrate the various steps of this method.

[0043] like Figure 1As shown, in step S110, the displacement information of the pumping unit to be determined in the current complete stroke cycle is collected. The present invention determines the type and operating condition of the pumping unit to be determined based on the displacement data in a complete stroke cycle of the pumping unit, and uses pattern recognition to compare the displacement characteristic graphs corresponding to the type and operating condition of the pumping unit, so as to determine the type and operating condition of the pumping unit to be determined. Among them, the difference between conventional walking beam machines and out-of-phase walking beam machines can be reflected in the displacement curve. The positive and negative rotations are currently mainly aimed at out-of-phase walking beam machines. When the crank movement is to lift the donkey head and the operating condition is reverse rotation, the average upward power of the pumping unit is large, the balancing effect is poor, and the energy consumption is high; when the crank movement is to press the donkey head and the operating condition is forward rotation, the average upward power of the pumping unit is small, the balancing effect is good, and the energy consumption is low. Accordingly, this embodiment needs to first collect the displacement information of the pumping unit to be determined in the current complete stroke cycle, so as to achieve the purpose of determining the type and operating condition of the pumping unit to be determined according to the displacement information.

[0044] After obtaining the displacement information of the pumping unit to be determined in the current complete stroke cycle, in step S120, the displacement information of the first time period and the second time period is extracted according to the displacement information of the complete stroke cycle, and the suspension point motion speed characteristics of the pumping rod are calculated in combination with the time length between the initial moment of the first time period and the end moment of the second time period, so as to determine whether the pumping unit to be determined is a beam pumping unit, wherein the first time period is any time period in which the complete stroke cycle is divided into a plurality of identical continuous time periods, and the second time period is a time period that is not adjacent to the first time period and is located after the first time period. Specifically, the present embodiment first divides the current complete stroke cycle into a plurality of identical continuous time periods. Afterwards, the displacement information generated by the first time period, the displacement information generated by the second time period that is not adjacent to the first time period and is located after the first time period, and the time length between the initial moment of the first time period and the end moment of the second time period are used to calculate the suspension point motion speed characteristics of the pumping rod on the pumping unit to be determined, so as to determine whether the pumping unit to be determined is a beam pumping unit according to the suspension point motion speed characteristics of the pumping rod, and if not, the pumping unit to be determined is determined to be a belt conveyor.

[0045] In the embodiment of the present application, each operation period of the pumping rod on the pumping unit to be determined is expressed by the following expression:

[0046] T N =T / n (1)

[0047] Among them, T N It represents the running time of the sucker rod in each period, T represents the sucker rod stroke cycle, and n represents the number of periods.

[0048] In a specific embodiment of the present application, in the process of dividing the complete stroke cycle into a plurality of identical continuous time periods, the number of the divided time periods is between 150 and 300.

[0049] In the step of calculating the suspension point movement speed characteristics of the sucker rod to determine whether the pumping unit to be determined is a walking beam pumping unit, first, different time periods within the complete stroke cycle are selected as first time periods and the suspension point movement speed characteristics corresponding to each first time period are calculated; then, by analyzing and comparing the suspension point movement speed characteristics corresponding to each first time period, it is determined whether the pumping unit to be determined is a walking beam pumping unit, wherein when the suspension point movement speed characteristics corresponding to each first time period are not completely the same, the pumping unit to be determined is determined to be a walking beam pumping unit, otherwise, the pumping unit to be determined is determined to be a belt conveyor. Figure 2 It is a schematic diagram of a belt conveyor suspension point displacement curve of a method for determining an operating condition of an oil pumping unit according to an embodiment of the present application. Figure 3 It is a schematic diagram of a conventional walking beam machine suspension point displacement curve for a method for determining an operating condition of an oil pumping unit according to an embodiment of the present application. Figure 4 It is a schematic diagram of the forward rotation suspension point displacement curve of the out-of-phase walking beam machine used in the operating condition determination method of the oil pumping unit in the embodiment of the present application. Figure 5 Schematic diagram of the displacement curve of the inversion suspension point of the out-of-phase walking beam machine used in the operating condition determination method of the oil pumping unit in the embodiment of the present application. After collecting the displacement information of the current complete stroke cycle, the following is generated: Figure 2 , Figure 3 , Figure 4 or Figure 5 The displacement curve of a stroke cycle of the oil pump shown in any of the accompanying drawings. Based on the current corresponding displacement curve, the present embodiment selects different time periods within the complete stroke cycle as the first time period (i.e., selects multiple first time periods), and calculates the suspension point motion speed characteristics corresponding to the corresponding first time period when each first time period is selected, thereby obtaining the suspension point motion speed characteristics corresponding to each first time period. Then, by analyzing and comparing the suspension point motion speed characteristics corresponding to each first time period (for example, speed change trend, etc.), a similarity judgment is made between the suspension point motion speed characteristics corresponding to each first time period. If the speed similarity is not completely consistent, it is the same as the operating condition of the walking beam oil pump, and the oil pump to be determined is determined to be a walking beam oil pump; conversely, if the speed similarity is completely consistent, it is the same as the operating condition of the tower type (belt pump) oil pump, and the oil pump to be determined is determined to be a belt pump.

[0050] In the embodiment of the present application, the suspension point motion speed feature is the suspension point motion average speed, wherein the suspension point motion average speed is calculated using the following expression:

[0051]

[0052] Among them, V i represents the average speed of the suspension point during the i-th period, PR i represents the displacement of the ith period, PR (i+2)Represents the displacement in the (i + 2)-th period.

[0053] In a specific embodiment of the present application, if ||V i -V j || = 0 and 2i < j < n - 2, then it is determined that the pumping unit to be determined is a belt-driven unit; if ||V i -V j || ≠ 0 and 2i < j < n - 2, then it is determined that the pumping unit to be determined is a belt-driven unit, where V j represents the average speed of the polished rod movement in the j-th period.

[0054] In step S130, when it is determined to be a beam pumping unit, the position of the sucker rod is analyzed using the displacement information in the first period, and when the sucker rod reaches the top dead center position, the phase difference angle of the pumping unit to be determined and the movement duration of the polished rod suspension point are calculated. Based on this, the operating condition of the current pumping unit is obtained. Specifically, in this embodiment, based on the displacement curve corresponding to the determination of the beam pumping unit, the operating condition of the pumping unit is further studied, and the position of the sucker rod is analyzed using the displacement information in the first period to determine the moment when the sucker rod reaches the top dead center position. And when the sucker rod reaches the top dead center position, the phase difference angle of the pumping unit to be determined and the movement duration of the polished rod suspension point are calculated, so as to determine whether the current pumping unit to be determined is a conventional pumping unit or a phase difference type pumping unit according to the phase difference angle. Finally, when it is determined to be a phase difference type pumping unit, the operating condition of the phase difference type pumping unit is obtained by further combining the movement duration of the polished rod suspension point.

[0055] Next, in the step of analyzing the position of the sucker rod using the displacement information in the first period, by analyzing and comparing the displacement in the first period with a preset displacement threshold, it is determined whether the sucker rod reaches the top dead center position, where the preset displacement threshold is obtained according to the displacement change characteristics of the beam pumping unit during a complete stroke cycle in the historical operation process. In the embodiment of the present application, a preset displacement threshold for determining whether the sucker rod reaches the top dead center position is set, and the preset displacement threshold is obtained according to the displacement change characteristics of the beam pumping unit during a complete stroke cycle in the historical operation process. In this embodiment, it is determined whether the sucker rod reaches the top dead center position by analyzing and comparing whether the displacement in the first period is equal to the preset displacement threshold. Accordingly, in this embodiment, it is judged whether the polished rod movement displacement PR(i) in the i-th period (the first period) is equal to the preset displacement threshold PR(m). If so, it is determined that the sucker rod reaches the top dead center position, and the total duration from the bottom dead center position to the top dead center position of the sucker rod is recorded as t top .

[0056] In a specific embodiment of the present application, in the process of determining whether the pumping unit to be determined is an out-of-phase type pumping unit according to the out-of-phase angle, if the out-of-phase angle is zero, the pumping unit to be determined is determined to be a conventional pumping unit, otherwise, the pumping unit to be determined is determined to be an out-of-phase type pumping unit. That is, in this embodiment, when the out-of-phase angle ɑ=0, the pumping unit is determined to be a conventional pumping unit; when the out-of-phase angle ɑ≠0, the pumping unit is determined to be an out-of-phase type pumping unit.

[0057] In the step of calculating the out-of-phase angle of the pumping unit to be determined and the duration of the suspension point movement of the sucker rod, and based on this, obtaining the operating condition of the current pumping unit, first, the out-of-phase angle is obtained by using the total duration of the sucker rod of the pumping unit to be determined from the bottom dead center to the top dead center and the number of time periods corresponding to the complete stroke cycle; then, it is determined whether the pumping unit to be determined is an out-of-phase type pumping unit according to the out-of-phase angle, wherein, when it is determined to be an out-of-phase type pumping unit, the operating state of the pumping unit crank used to generate the operating condition is obtained by using the ratio of the up movement duration to the down movement duration in the suspension point movement duration of the sucker rod. Specifically, this embodiment records the time when the sucker rod of the pumping unit to be determined reaches the bottom dead center position and the top dead center position respectively within the complete stroke cycle, so as to calculate the out-of-phase angle by using the total duration of the sucker rod of the pumping unit to be determined from the bottom dead center to the top dead center and the number of time periods corresponding to the complete stroke cycle, so as to determine whether the pumping unit to be determined is an out-of-phase type pumping unit. When it is determined to be an out-of-phase type pumping unit, since the operating condition when the crank moves to lift the donkey head is reverse rotation, and the operating condition when the crank moves to press the donkey head is forward rotation, this embodiment uses the operating state of the pumping unit crank to generate the corresponding operating condition. The operating state of the pumping unit crank is calculated by the ratio of the upward movement time length to the downward movement time length of the suspension point movement time length of the pumping rod.

[0058] In the embodiment of the present application, the out-of-phase angle is calculated using the following expression:

[0059]

[0060] Where α represents the phase difference angle, i top It indicates the total time for the sucker rod to reach the top dead center from the bottom dead center.

[0061] Next, when it is determined to be an out-of-phase pumping unit, the ratio of the upward movement duration to the downward movement duration in the suspension point movement duration of the sucker rod is used to obtain the operating state of the pumping unit crank used to generate the operating condition. If the ratio of the upward movement duration to the downward movement duration is less than 1, and the upward movement duration is less than the downward movement duration, the pumping unit crank operating state is determined to be reverse, and the reverse state is used as the current operating condition of the pumping unit; if the ratio of the upward movement duration to the downward movement duration is greater than 1, and the upward movement duration is greater than the downward movement duration, the pumping unit crank operating state is determined to be forward, and the forward state is used as the current operating condition of the pumping unit. In the embodiment of the present application, the upward movement duration in the suspension point movement duration of the sucker rod is the total time for the sucker rod to reach the upper dead center from the bottom dead center, and the downward movement duration can be obtained by calculating the difference between the sucker rod stroke cycle and the aforementioned total duration. Among them, if the ratio ε<1 and the upward movement duration is less than the downward movement duration, the operating state of the pumping unit crank is reverse, that is, the current operating condition of the pumping unit is reverse, and a judgment result is generated that the pumping unit to be determined is an out-of-phase reverse pumping unit; if the ratio ε>1 and the upward movement duration is greater than the downward movement duration, the operating state of the pumping unit crank is forward, that is, the current operating condition of the pumping unit is forward, and a judgment result is generated that the pumping unit to be determined is an out-of-phase forward pumping unit.

[0062] Figure 6 This is a first example diagram of the suspension point displacement curve of the out-of-phase type walking beam machine used in the operating condition determination method of the oil pumping unit according to the embodiment of the present application. Figure 6 The suspension point displacement curve of the out-of-phase beam crawler collected in a certain period of the oil well has a peak displacement point occurring in the 106th period. At this time, the out-of-phase angle is calculated using the following expression:

[0063]

[0064] Based on this, the out-of-phase angle is not equal to 0, and it is determined that the current pumping unit to be determined is an out-of-phase type pumping unit.

[0065] After determining that the current pumping unit to be determined is an out-of-phase pumping unit, continue to calculate the ratio of the upward running time and the downward running time of the sucker rod suspension point ε=1.12>1. At this time, the ratio is greater than 1, generating a determination result that the current pumping unit to be determined is an out-of-phase forward pumping unit.

[0066] Figure 7 This is a second example diagram of the suspension point displacement curve of the out-of-phase type walking beam machine used in the operating condition determination method of the oil pumping unit according to the embodiment of the present application. Figure 7 , the suspension point displacement curve of the out-of-phase beam crawler collected in a certain period of the oil well is divided into 200 periods. The displacement peak point occurs in the 91st period. At this time, the out-of-phase angle is calculated using the following expression:

[0067]

[0068] Based on this, the out-of-phase angle is not equal to 0, and it is determined that the current pumping unit to be determined is an out-of-phase type pumping unit.

[0069] After determining that the current pumping unit to be determined is an out-of-phase pumping unit, continue to calculate the ratio of the upward running time and the downward running time of the sucker rod suspension point ε=0.89<1. At this time, the ratio is less than 1, generating a determination result that the current pumping unit to be determined is an out-of-phase rotation pumping unit.

[0070] In addition, the determination method of the present invention was applied to nearly 1,000 oil pumping wells in three oil field management areas, and the oil pumping model and steering were automatically identified within half an hour, with an accuracy rate of 100%, solving the problem of the remote video angle of the oil pumping unit and the inability to view the crank phase angle. Moreover, the present invention has high dynamics and can dynamically monitor the out-of-phase angle and crank operating conditions of the oil pumping unit, providing effective data support for on-site energy saving, balance adjustment and out-of-phase angle adjustment.

[0071] Embodiment 2

[0072] Based on the operating condition determination method for an oil pump described in the first embodiment, an embodiment of the present invention further provides an operating condition determination system for an oil pump (hereinafter referred to as “operating condition determination system”). Figure 8 It is a module block diagram of an operating condition determination system for an oil pumping unit according to an embodiment of the present application.

[0073] like Figure 8As shown, the operating condition determination system in the embodiment of the present invention includes: a displacement information acquisition module 81, a beam pumping unit determination module 82 and an operating condition determination module 83. The displacement information acquisition module 81 is implemented according to the method described in the above step S110, and is configured to collect the displacement information of the pumping unit to be determined in the current complete stroke cycle; the walking beam pumping unit determination module 82 is implemented according to the method described in the above step S120, and is configured to extract the displacement information of the first time period and the second time period according to the displacement information of the complete stroke cycle, and calculate the suspension point movement speed characteristics of the sucker rod in combination with the time length between the initial moment of the first time period and the end moment of the second time period, so as to determine whether the pumping unit to be determined is a walking beam pumping unit, wherein the first time period is any time period of a plurality of identical continuous time periods into which the complete stroke cycle is divided, and the second time period is a time period that is not adjacent to the first time period and is located after the first time period; the operating condition determination module 83 is implemented according to the method described in the above step S130, and is configured to analyze the position of the sucker rod using the displacement information of the first time period when it is determined to be a walking beam pumping unit, and when the sucker rod reaches the top dead center position, calculate the out-of-phase angle of the pumping unit to be determined and the suspension point movement duration of the sucker rod, based on which, the operating condition of the current pumping unit is obtained.

[0074] The present invention discloses a method and system for determining the operating condition of an oil pump. The method uses the displacement information of the oil pump to be determined in the current complete stroke cycle to analyze the phase angle characteristics of the oil pump to be determined, and realizes automatic detection of the model and operating mode of the oil pump to be determined according to the phase angle characteristic analysis results. The present invention realizes automatic identification of the model and operating mode of the oil pump to be determined by detecting and comprehensively judging the out-of-phase angle of the displacement variable, solves the problem that the model and operating mode of the digital oil pump of the oil well cannot be automatically identified, is suitable for the automated operation and maintenance and information management of digital oil wells, and can guide the implementation of energy-saving measures for oil pump wells. The present invention realizes automatic identification of the out-of-phase angle, model and operating condition of the oil pump, greatly reduces the labor intensity of employees, assists in the optimization of energy-saving measures for oil wells, improves the digitization degree of oil well equipment, reduces the energy consumption of oil well operation, improves the integrity management of oil well equipment, and improves the refinement and digitalization degree of oil well management.

[0075] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any person familiar with the technology within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

[0076] Of course, the present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art may make various corresponding changes and modifications based on the present invention, but these corresponding changes and modifications should all fall within the scope of protection of the claims of the present invention.

[0077] It should be understood by those skilled in the art that the modules or steps of the present invention described above can be implemented by a general-purpose computing device, they can be concentrated on a single computing device, or distributed on a network composed of multiple computing devices, and optionally, they can be implemented by a program code executable by a computing device, so that they can be stored in a storage device and executed by the computing device, or they can be made into individual integrated circuit modules, or multiple modules or steps therein can be made into a single integrated circuit module for implementation. Thus, the present invention is not limited to any specific combination of hardware and software.

[0078] Although the embodiments disclosed in the present invention are as above, the above contents are only embodiments adopted for facilitating the understanding of the present invention and are not intended to limit the present invention. Any technician in the technical field to which the present invention belongs can make any modifications and changes in the form and details of the implementation without departing from the spirit and scope disclosed in the present invention, but the patent protection scope of the present invention shall still be subject to the scope defined in the attached claims.

Claims

1. A method for determining the operating condition of an oil pump, characterized in that: include: Collect the displacement information of the oil pumping unit to be determined within the current complete stroke cycle; Extracting displacement information of the first time period and the second time period according to the displacement information of the complete stroke cycle, and calculating the motion speed characteristics of the suspension point of the sucker rod in combination with the time length from the initial moment of the first time period to the end moment of the second time period, so as to determine whether the pumping unit to be determined is a beam pumping unit, wherein the first time period is any time period of a plurality of identical continuous time periods into which the complete stroke cycle is divided, and the second time period is a time period that is not adjacent to the first time period and is located after the first time period; When it is determined to be a walking beam pumping unit, the displacement information of the first time period is used to analyze the position of the sucker rod, and when the sucker rod reaches the top dead center position, the out-of-phase angle of the pumping unit to be determined and the duration of the suspension point movement of the sucker rod are calculated, based on which the current operating condition of the pumping unit is obtained.

2. The operating condition determination method according to claim 1, characterized in that: The step of calculating the motion speed characteristic of the suspension point of the pumping rod to determine whether the pumping unit to be determined is a beam pumping unit includes: Selecting different time periods within the complete stroke cycle as first time periods and calculating the suspension point motion speed characteristics corresponding to each first time period; By analyzing and comparing the suspension point motion speed characteristics corresponding to each first period, it is determined whether the pumping unit to be determined is a beam pumping unit, wherein: When the suspension point motion speed characteristics corresponding to each first time period are not completely the same, the pumping unit to be determined is determined to be a beam pumping unit; otherwise, the pumping unit to be determined is determined to be a belt conveyor.

3. The operating condition determination method according to claim 2, characterized in that: The suspension point motion speed characteristic is the suspension point motion average speed, wherein the suspension point motion average speed is calculated using the following expression: Among them, V i represents the average speed of the suspension point during the i-th period, PR i represents the displacement of the ith period, PR (i+2) represents the displacement of the i+2th period, T N Indicates the running time of the sucker rod in each period.

4. The operating condition determination method according to any one of claims 1 to 3, characterized in that: The step of analyzing the position of the sucker rod by using the displacement information of the first period includes: By analyzing and comparing the displacement in the first time period with a preset displacement threshold, it is determined whether the sucker rod reaches the top dead center position, wherein the preset displacement threshold is obtained based on the displacement change characteristics of the walking beam pumping unit within a complete stroke cycle during historical operation.

5. The operating condition determination method according to any one of claims 1 to 4, characterized in that: The step of calculating the out-of-phase angle of the pumping unit to be determined and the duration of the suspension point movement of the pumping rod, and based on this, obtaining the current operating condition of the pumping unit includes: The out-of-phase angle is obtained by using the total time length of the pumping rod of the pumping unit to be determined to reach the upper dead center from the lower dead center and the number of time periods corresponding to the complete stroke cycle; According to the out-of-phase angle, it is determined whether the pumping unit to be determined is an out-of-phase type pumping unit, wherein: When the out-of-phase pumping unit is determined, the operating state of the pumping unit crank for generating the operating condition is obtained by using the ratio of the upward movement duration to the downward movement duration in the suspension point movement duration of the sucker rod.

6. The operating condition determination method according to claim 5, characterized in that: In the process of determining whether the to-be-determined pumping unit is an out-of-phase type pumping unit according to the out-of-phase angle, the method comprises: If the out-of-phase angle is zero, it is determined that the pumping unit to be determined is a conventional pumping unit. Otherwise, it is determined that the pumping unit to be determined is an out-of-phase type pumping unit.

7. The operating condition determination method according to claim 5 or 6, characterized in that: The out-of-phase angle is calculated using the following expression: Among them, α represents the phase angle, i top It represents the total time for the sucker rod to reach the top dead center from the bottom dead center, and n represents the number of time periods.

8. The operating condition determination method according to any one of claims 5 to 7, characterized in that: When determining that the pumping unit is an out-of-phase type, the process of obtaining the operating state of the pumping unit crank for generating the operating condition by using the ratio of the upward movement duration to the downward movement duration in the suspension point movement duration of the pumping rod includes: If the ratio of the duration of the upward movement to the duration of the downward movement is less than 1, and the duration of the upward movement is less than the duration of the downward movement, it is determined that the crank operation state of the pumping unit is reverse, and the reverse state is used as the current operating condition of the pumping unit; If the ratio of the upward movement duration to the downward movement duration is greater than 1, and the upward movement duration is greater than the downward movement duration, it is determined that the operating state of the pumping unit crank is forward rotation, and the forward rotation state is used as the current operating condition of the pumping unit.

9. The operating condition determination method according to any one of claims 1 to 8, characterized in that: The process of dividing the complete stroke cycle into a plurality of identical continuous time periods comprises: The number of divided time periods is between 150 and 300.

10. A system for determining the operating condition of an oil pump, characterized in that: The operating condition determination system includes the following modules: A displacement information acquisition module, which is used to acquire the displacement information of the oil pumping unit to be determined within the current complete stroke cycle; A beam pumping unit determination module, which is used to extract the displacement information of the first time period and the second time period according to the displacement information of the complete stroke cycle, and calculate the suspension point motion speed characteristics of the pumping rod in combination with the time length between the initial moment of the first time period and the end moment of the second time period, so as to determine whether the pumping unit to be determined is a beam pumping unit, wherein the first time period is any time period of a plurality of identical continuous time periods into which the complete stroke cycle is divided, and the second time period is a time period that is not adjacent to the first time period and is located after the first time period; The operating condition determination module is used to analyze the position of the sucker rod using the displacement information of the first time period when determining that it is a walking beam pumping unit, and when the sucker rod reaches the top dead center position, calculate the out-of-phase angle of the pumping unit to be determined and the duration of the suspension point movement of the sucker rod, based on which, the operating condition of the current pumping unit is obtained.

Images