CN112878989A - Real-time monitoring method and system for hot washing process of sucker rod pump oil well based on electric power - Google Patents

Real-time monitoring method and system for hot washing process of sucker rod pump oil well based on electric power Download PDF

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Publication number
CN112878989A
CN112878989A CN202110153123.9A CN202110153123A CN112878989A CN 112878989 A CN112878989 A CN 112878989A CN 202110153123 A CN202110153123 A CN 202110153123A CN 112878989 A CN112878989 A CN 112878989A
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stroke
electric power
integral
pumping unit
current
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高宪文
韩彦爽
王明顺
李翔宇
侯延彬
张斌
郝得智
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Northeastern University China
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Northeastern University China
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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B37/00—Methods or apparatus for cleaning boreholes or wells
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q50/00—Systems or methods specially adapted for specific business sectors, e.g. utilities or tourism
    • G06Q50/02—Agriculture; Fishing; Mining
    • G—PHYSICS
    • G16—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS
    • G16Y—INFORMATION AND COMMUNICATION TECHNOLOGY SPECIALLY ADAPTED FOR THE INTERNET OF THINGS [IoT]
    • G16Y10/00—Economic sectors
    • G16Y10/20—Mining
    • G—PHYSICS
    • G16—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS
    • G16Y—INFORMATION AND COMMUNICATION TECHNOLOGY SPECIALLY ADAPTED FOR THE INTERNET OF THINGS [IoT]
    • G16Y20/00—Information sensed or collected by the things
    • G16Y20/30—Information sensed or collected by the things relating to resources, e.g. consumed power
    • G—PHYSICS
    • G16—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS
    • G16Y—INFORMATION AND COMMUNICATION TECHNOLOGY SPECIALLY ADAPTED FOR THE INTERNET OF THINGS [IoT]
    • G16Y40/00—IoT characterised by the purpose of the information processing
    • G16Y40/10—Detection; Monitoring
    • G—PHYSICS
    • G16—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS
    • G16Y—INFORMATION AND COMMUNICATION TECHNOLOGY SPECIALLY ADAPTED FOR THE INTERNET OF THINGS [IoT]
    • G16Y40/00—IoT characterised by the purpose of the information processing
    • G16Y40/20—Analytics; Diagnosis

Abstract

The invention provides a real-time monitoring method and a real-time monitoring system for a hot washing process of a sucker rod pump oil well based on electric power. The method comprises the steps of firstly calculating reference power integrals in an up stroke period, a down stroke period and a complete stroke period according to electric parameter data acquired before well washing, then acquiring electric parameters of the sucker rod pump oil pumping unit in real time in the well washing process, calculating power integral values of the sucker rod pump oil pumping unit in the up stroke period, the down stroke period and the complete stroke period, judging whether hot washing is needed to be carried out continuously according to the ratio of the current calculated power integral value to each reference power integral value, monitoring the wax deposition condition in the well in real time on line, determining the consumption of a hot washing agent, and completing measurement without field operation of operators.

Description

Real-time monitoring method and system for hot washing process of sucker rod pump oil well based on electric power
Technical Field
The invention relates to the technical field of soft measurement, in particular to a real-time monitoring method and a real-time monitoring system for a hot washing process of a sucker rod pump oil well based on electric power.
Background
The sucker-rod pumping well pumps the petroleum in the bottom layer to the ground by utilizing the up-and-down motion of the stroke of the pumping unit. In the underground oil pumping process of the oil pumping unit, due to the influence of factors such as pressure and temperature change, crude oil degassing and the like, wax is continuously separated out and deposited on a deep well pump. The sucker rod and the pipe wall are simultaneously influenced by factors such as mechanical impurities, oil layer pollution, ground structure and the like, so that the sucker rod is easy to block, and the oil production is reduced. The hot washing water is used for removing wax from the oil pumping well, the operation is convenient, the cost is low, the oil well hot washing method can well remove wax precipitation and scale formation on the oil pumping well, and the application effect is good. The hot washing is carried out by a special washing device, the medium for washing the well is squeezed into the oil pipe, the wax adhered to the oil pipe is melted by the hot washing medium, and finally the liquid is pumped out by the oil pump so as to discharge the wax. However, people cannot visually observe the working process in the well under the ground deep in the oil well, and meanwhile, the measurement and observation operation of various parameters in the well are complex, the technical difficulty is high, and the cost is high, so that normally produced oil wells are generally not equipped with underground instruments, which causes technical personnel and operating personnel to lack complete and accurate understanding of the hot washing paraffin removal process, and influences the paraffin removal effect. How to use the minimum number of well-flushing times to ensure that the oil well obtains the maximum yield, and the well is flushed well with the best well-flushing time and the minimum energy consumption is an important task of oil extraction engineering.
At present, the hot washing degree is judged and the hot washing amount is determined mainly by adopting a manual experience method in the actual production process, the experience method has higher requirements on the experience, the technology, the responsibility and the like of a hot washing worker, and the misjudgment of the hot washing worker is not eliminated, so the method has great subjectivity. In the actual production process, because the degree of underground hot washing is not clear, the method of excessive well washing is mostly adopted, so that the waste of resources and the increase of production and personnel cost are caused.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a real-time monitoring method for the hot washing process of a sucker rod pump oil well based on electric power, which comprises the following steps:
step 1: collecting the electrical parameter data of the sucker rod pump oil pumping unit in real time before well washing, and calculating the power integral values of the sucker rod pump oil pumping unit in the up stroke, the down stroke and the complete stroke to be used as reference power integral;
step 2: collecting the electrical parameter data of the sucker rod pump pumping unit in real time in the well washing process, and calculating the power integral values of the sucker rod pump pumping unit in the up stroke, the down stroke and the complete stroke;
and step 3: judging whether to continue hot washing, if so
Figure BDA0002933196470000011
Or
Figure BDA0002933196470000012
Or
Figure BDA0002933196470000013
Indicating that the wax precipitation is still serious and the cleaning is needed to be continued, or else executing step 4, wherein eta1、η2、η3The judgment threshold values of the up stroke, the down stroke and the complete stroke in the hot washing process are shown,
Figure BDA0002933196470000021
reference power for upstrokeThe result of the integration is,
Figure BDA0002933196470000022
is the reference power integral of the down stroke,
Figure BDA0002933196470000023
integral of reference power for a complete stroke cycle, POn the upper partIntegral of electric power for upstroke in current stroke cycle, PLower partThe electric power integral of the down stroke in the current stroke cycle is obtained, and P is the electric power integral in the current complete stroke cycle;
and 4, step 4: judging whether to finish hot washing, if so, meeting the requirements in continuous M stroke cycles
Figure BDA0002933196470000024
And is
Figure BDA0002933196470000025
And is
Figure BDA0002933196470000026
It indicates that the downhole wax deposit is effectively removed and the well wash may be terminated, where eta4、η5、η6The judgment threshold value represents the up stroke, the down stroke and the complete stroke when the well washing is finished;
and 5: collecting the electrical parameter data of the sucker rod pump oil pumping unit in real time after the well washing is finished, calculating the power integral values of the sucker rod pump oil pumping unit in the up stroke, the down stroke and the complete stroke, judging whether the hot washing needs to be started, and if the power integral P in the complete stroke period obtained by calculation meets the requirement of the power integral P in the complete stroke period
Figure BDA0002933196470000027
Then the wax precipitation is performed in the well, the washing heat needs to be started, and the time t of starting the washing heat is recorded2Wherein eta7A judgment threshold value representing a complete stroke at the next well flushing;
step 6: updating the well washing period according to the time interval T of two continuous hot washing, wherein T is T2-t1。
The step 1 comprises the following steps:
step 1.1: calculating real-time electric power of the sucker-rod pump pumping unit according to electric parameters of the sucker-rod pump pumping unit collected before well washing, wherein the electric parameters comprise three-phase voltage and three-phase current;
Figure BDA0002933196470000028
in the formula, Pt.jIs the electric power at the jth sampling point in the t-stroke cycle, Ut.jIs the voltage value at the jth sampling point in the t stroke cycle, It.jThe current value at the jth sampling point in the t-th stroke cycle,
Figure BDA0002933196470000029
is the power factor at the jth sampling point in the tth stroke cycle;
step 1.2: calculating the power integral of the sucker rod pump pumping unit in the periods of up stroke, down stroke and complete stroke:
Figure BDA00029331964700000210
Figure BDA00029331964700000211
Figure BDA00029331964700000212
Pt＝Pt. on+Pt. lower
In the formula, St.jIs the trapezoidal area enclosed by the electric power at the jth sampling point and the electric power at the (j +1) th sampling point in the t stroke cycle, Pt.j+1Is the electric power at the (j +1) th sampling point in the t-th stroke cycle, Δ x is the sampling interval, Pt. onIs the integral of the electrical power on the upstroke during the t-th stroke cycle,Pt. lowerIntegral of electric power for the down stroke in the t-th stroke cycle, PtFor the integral of electric power during the t-th complete stroke cycle, nt.1Number of sampling points in the upstroke of the t-th stroke cycle, nt.2The number of sampling points in the lower stroke of the t-th stroke cycle;
step 1.3: calculating the average value of the electric power of the pumping unit with the rod pump during the up stroke of the pumping unit in m continuous stroke cycles
Figure BDA0002933196470000031
Integration as reference power for upstroke:
Figure BDA0002933196470000032
calculating the mean value of the electric power of the down stroke of the sucker rod pump pumping unit in m continuous stroke cycles
Figure BDA0002933196470000033
Integration of reference power as downstroke:
Figure BDA0002933196470000034
calculating the average value of electric power of sucker rod pump oil extractor in m continuous complete stroke cycles
Figure BDA0002933196470000035
Integration of reference power as a complete stroke cycle:
Figure BDA0002933196470000036
the step 2 comprises the following steps:
step 2.1: recording the start time of well flushing as t1Calculating the real-time electric power of the sucker-rod pumping unit according to the electric parameters of the sucker-rod pumping unit collected in the well washing process;
Figure BDA0002933196470000037
in the formula, PjFor electric power at the jth sampling point in the current stroke cycle, UjIs the voltage value at the jth sampling point in the current stroke cycle, IjThe current value at the jth sampling point in the current stroke cycle,
Figure BDA0002933196470000038
the power factor at the jth sampling point in the current stroke cycle;
step 2.2: calculating the power integral of the sucker rod pump pumping unit in the periods of up stroke, down stroke and complete stroke:
Figure BDA0002933196470000041
Figure BDA0002933196470000042
Figure BDA0002933196470000043
Figure BDA0002933196470000044
in the formula, SjIs the trapezoidal area enclosed by the electric power at the jth sampling point and the electric power at the (j +1) th sampling point in the current stroke cycle, Pj+1Is the electric power at the (j +1) th sampling point in the current stroke cycle, and Δ x is the sampling interval, POn the upper partIntegral of electric power for upstroke in current stroke cycle, PLower partIs the electric power integral of the down stroke in the current stroke cycle, P is the electric power integral in the current complete stroke cycle, n1Number of sampling points of upstroke, n, in the current stroke cycle2For extraction of downstroke in the current stroke cycleAnd (4) counting the number of samples.
A monitoring system for realizing a real-time monitoring method of a hot washing process of a sucker rod pump oil well based on electric power comprises an electric parameter acquisition device, an electric parameter processing device, a wireless WiFi transmission device and an upper computer, wherein the electric parameter acquisition device is electrically connected with the electric parameter processing device, and the electric parameter processing device carries out data transmission with the upper computer through the wireless WiFi transmission device;
the electric parameter acquisition device is used for measuring electric parameters of the sucker rod pump pumping unit and outputting an electric power value in real time, wherein the electric parameters comprise three-phase voltage and three-phase current;
the electrical parameter processing device is used for calculating an electric power integral value in each stroke period and judging whether hot washing is needed or not;
the upper computer is used for realizing the interaction of human-computer information, displaying electric parameter data and electric power values in real time and displaying whether the current state is a hot washing state or not;
the wireless WiFi transmission device is used for realizing wireless signal transmission between the electrical parameter processing device and the upper computer.
The invention has the beneficial effects that:
the invention has proposed a kind of sucker rod pump oil well hot washing process real-time monitoring method and system based on electric power, with the help of the relation between electric power and wax precipitation degree, set up its calculation model, can monitor the wax precipitation situation in the well in real time online, confirm the consumption of the hot washing agent, compare with artificial experience method, the measuring process is full automatic, do not need the field operation of the operating personnel, can finish measuring; the field data and the well-flushing period judgment result are transmitted through wireless Wi-Fi and are automatically stored without manual recording, the probability of data loss and recording error is reduced, the production efficiency is improved, the wax deposition condition in the well can be judged more accurately, meanwhile, the using amount of the hot washing agent is saved, and the economic benefit of the oil field is improved.
Drawings
Fig. 1 is a flow chart of a real-time monitoring method for the hot washing process of the sucker-rod oil well based on electric power in the invention.
Fig. 2 is a block diagram of a monitoring system for real-time monitoring of the hot washing process of the sucker-rod oil well based on electric power according to the present invention.
Fig. 3 is a schematic circuit diagram of the monitoring system according to the embodiment of the present invention.
Detailed Description
The invention is further explained by combining the attached drawings and the concrete implementation example, and the load on the sucker rod is increased by theoretical analysis, field investigation, wax deposition and other factors, so that the pumping unit does much useless work in the up stroke and the down stroke, and the electric power of the motor is increased. The average power of the up-down stroke and the whole period of the pumping unit can reflect the change of the load on the sucker rod under the condition that the ground device and the balance are not changed, so that the underground wax deposition condition is reflected, and key guidance is provided for the well washing process.
The invention provides a real-time monitoring method for the hot washing process of a sucker rod pumping well based on electric power, which is shown in figure 1 and comprises the following steps of:
step 1: the method comprises the following steps of collecting electric parameter data of the sucker rod pump oil pumping unit in real time before well washing, calculating power integral values of the sucker rod pump oil pumping unit in an up stroke, a down stroke and a complete stroke, and using the power integral values as reference power integral, wherein the method comprises the following steps:
step 1.1: calculating real-time electric power of the sucker-rod pump pumping unit according to electric parameters of the sucker-rod pump pumping unit collected before well washing, wherein the electric parameters comprise three-phase voltage and three-phase current;
Figure BDA0002933196470000051
in the formula, Pt.jIs the electric power at the jth sampling point in the t-stroke cycle, Ut.jIs the voltage value at the jth sampling point in the t stroke cycle, It.jThe current value at the jth sampling point in the t-th stroke cycle,
Figure BDA0002933196470000052
is the power factor at the jth sampling point in the tth stroke cycle;
step 1.2: calculating the power integral of the sucker rod pump pumping unit in the periods of up stroke, down stroke and complete stroke:
Figure BDA0002933196470000053
Figure BDA0002933196470000054
Figure BDA0002933196470000055
Pt＝Pt. on+Pt. lower
In the formula, St.jIs the trapezoidal area enclosed by the electric power at the jth sampling point and the electric power at the (j +1) th sampling point in the t stroke cycle, Pt.j+1Is the electric power at the (j +1) th sampling point in the t stroke cycle, and Δ x is the sampling interval, and let Δ x be 1 second, Pt. onIntegral of electric power on upstroke in the t-th stroke cycle, Pt. lowerIntegral of electric power for the down stroke in the t-th stroke cycle, PtFor the integral of electric power during the t-th complete stroke cycle, nt.1Number of sampling points in the upstroke of the t-th stroke cycle, nt.2The number of sampling points in the lower stroke of the t-th stroke cycle;
step 1.3: calculating the average value of the electric power of the pumping unit with the rod pump during the up stroke of the pumping unit in m continuous stroke cycles
Figure BDA0002933196470000061
Integration as reference power for upstroke:
Figure BDA0002933196470000062
calculating the mean value of the electric power of the down stroke of the sucker rod pump pumping unit in m continuous stroke cycles
Figure BDA0002933196470000063
Integration of reference power as downstroke:
Figure BDA0002933196470000064
calculating the average value of electric power of sucker rod pump oil extractor in m continuous complete stroke cycles
Figure BDA0002933196470000065
Integration of reference power as a complete stroke cycle:
Figure BDA0002933196470000066
step 2: the real-time collection of the electrical parameter data of the sucker rod pump oil pumping unit in the well washing process, the power integral value of the sucker rod pump oil pumping unit in the up stroke, the down stroke and the complete stroke are calculated, and the method comprises the following steps:
step 2.1: recording the start time of well flushing as t1Calculating the real-time electric power of the sucker-rod pumping unit according to the electric parameters of the sucker-rod pumping unit collected in the well washing process;
Figure BDA0002933196470000067
in the formula, PjFor electric power at the jth sampling point in the current stroke cycle, UjIs the voltage value at the jth sampling point in the current stroke cycle, IjThe current value at the jth sampling point in the current stroke cycle,
Figure BDA0002933196470000071
the power factor at the jth sampling point in the current stroke cycle;
step 2.2: calculating the power integral of the sucker rod pump pumping unit in the periods of up stroke, down stroke and complete stroke:
Figure BDA0002933196470000072
Figure BDA0002933196470000073
Figure BDA0002933196470000074
Figure BDA0002933196470000075
in the formula, SjIs the trapezoidal area enclosed by the electric power at the jth sampling point and the electric power at the (j +1) th sampling point in the current stroke cycle, Pj+1Is the electric power at the (j +1) th sampling point in the current stroke cycle, and Δ x is the sampling interval, POn the upper partIntegral of electric power for upstroke in current stroke cycle, PLower partIs the electric power integral of the down stroke in the current stroke cycle, P is the electric power integral in the current complete stroke cycle, n1Number of sampling points of upstroke, n, in the current stroke cycle2The sampling point number of the down stroke in the current stroke cycle is counted;
then, the measured power integrals of the current up stroke, the down stroke and the complete stroke are respectively compared with the reference power integral, and when the difference between the measured power integral and the reference power integral is small, the underground wax deposition condition is still serious and the cleaning is required to be continued; when the difference between the measured power integral and the reference power integral is larger, the underground wax deposition condition is effectively eliminated, and when the average power measured in a plurality of cycles is basically unchanged, the well washing process is considered to be finished;
and step 3: judging whether to continue hot washing, if so
Figure BDA0002933196470000076
Or
Figure BDA0002933196470000077
Or
Figure BDA0002933196470000078
Indicating that the wax precipitation is still serious and the cleaning is needed to be continued, or else executing step 4, wherein eta1、η2、η3The judgment threshold, eta, representing the up-stroke, down-stroke, complete stroke in the hot washing process1、η2、η3The average value range is generally set to [1,1.25 ]]；
In the hot washing process, when the difference between the measured power integral value and the reference power integral value is larger, the wax deposition in the well is effectively removed, and when the measured power integral values in a plurality of cycles are basically unchanged, the well washing process is considered to be ended;
and 4, step 4: judging whether to finish hot washing, if so, meeting the requirements in continuous M stroke cycles
Figure BDA0002933196470000081
And is
Figure BDA0002933196470000082
And is
Figure BDA0002933196470000083
It indicates that the downhole wax deposit is effectively removed and the well wash may be terminated, where eta4、η5、η6Judging threshold, eta, representing up-stroke, down-stroke, complete stroke at the end of well-flushing4、η5、η6Is generally greater than 1.25;
and 5: collecting the electrical parameter data of the sucker rod pump oil pumping unit in real time after the well washing is finished, calculating the power integral values of the sucker rod pump oil pumping unit in the up stroke, the down stroke and the complete stroke, judging whether the hot washing needs to be started, and if the power integral P in the complete stroke period obtained by calculation meets the requirement of the power integral P in the complete stroke period
Figure BDA0002933196470000084
Then the wax precipitation is performed in the well, the washing heat needs to be started, and the time t of starting the washing heat is recorded2Wherein eta7Threshold, eta, for determining the complete stroke during the next well-flushing7The value range of (A) is 0.9-1.1;
step 6: updating the well washing period according to the time interval T of two continuous hot washing, wherein T is T2-t1。
As shown in fig. 2, a monitoring system for realizing a real-time monitoring method for a hot washing process of a sucker rod pump oil well based on electric power comprises an electric parameter acquisition device, an electric parameter processing device, a wireless WiFi transmission device and an upper computer, wherein the electric parameter acquisition device is electrically connected with the electric parameter processing device, and the electric parameter processing device is in data transmission with the upper computer through the wireless WiFi transmission device;
the electric parameter acquisition device is used for measuring electric parameters of the sucker rod pump pumping unit and outputting an electric power value in real time, wherein the electric parameters comprise three-phase voltage and three-phase current;
the electrical parameter processing device is used for calculating an electric power integral value in each stroke period and judging whether hot washing is needed or not;
the upper computer is used for realizing the interaction of human-computer information, displaying electric parameter data and electric power values in real time and displaying whether the current state is a hot washing state or not;
the wireless WiFi transmission device is used for realizing wireless signal transmission between the electrical parameter processing device and the upper computer.
In the embodiment, the electrical parameter acquisition device comprises a current transformer with the model of CTKD-16 for acquiring a three-phase current value, a voltage transformer with the model of ZMPT101B for acquiring a three-phase voltage value, and a three-phase multifunctional metering module with the model of ATT7022 for outputting an electrical power value at each sampling point; the wireless WiFi transmission device adopts a WiFi module with the model of USR-W600, the electric parameter processing device adopts an embedded data processing module with the model of stm32f103, an electric power value (namely an active power value) output by the three-phase multifunctional metering module is input to the embedded data processing module to calculate an electric power integral value in an upstroke, a downstroke and a complete stroke period, whether hot washing is needed currently or not is judged according to each threshold value set by an upper computer, the embedded data processing module is electrically connected with the WiFi module, data are transmitted to the upper computer through wireless signals transmitted by the WiFi module, a specific wiring schematic diagram is shown in figure 3, a current transformer and a voltage transformer are respectively and electrically connected with a sucker rod pump pumping unit, the three-phase multifunctional metering module is respectively and electrically connected with the current transformer and the voltage transformer and is used for collecting three-phase current values, The three-phase voltage value calculates the electric power value of each sampling point, the embedded data processing module is electrically connected with the three-phase multifunctional metering module, the electric power output by the three-phase multifunctional metering module is input to the embedded data processing module for data processing, the embedded data processing module performs data transmission with an upper computer through WiFi signals transmitted by the WiFi module, a monitoring interface on the upper computer is written by Java language, the electric power value and a change curve thereof as well as the running state of an oil well are displayed in real time, and man-machine information interaction is realized.

Claims (4)

1. A real-time monitoring method for hot washing process of sucker-rod oil well based on electric power is characterized by comprising the following steps:
step 1: collecting the electrical parameter data of the sucker rod pump oil pumping unit in real time before well washing, and calculating the power integral values of the sucker rod pump oil pumping unit in the up stroke, the down stroke and the complete stroke to be used as reference power integral;
step 2: collecting the electrical parameter data of the sucker rod pump pumping unit in real time in the well washing process, and calculating the power integral values of the sucker rod pump pumping unit in the up stroke, the down stroke and the complete stroke;
and step 3: judging whether to continue hot washing, if so
Figure FDA0002933196460000011
Or
Figure FDA0002933196460000012
Or
Figure FDA0002933196460000013
Indicating that the wax precipitation is still serious and the cleaning is needed to be continued, or else executing step 4, wherein eta1、η2、η3The judgment threshold values of the up stroke, the down stroke and the complete stroke in the hot washing process are shown,
Figure FDA0002933196460000014
is an integral of the reference power of the up stroke,
Figure FDA0002933196460000015
is the reference power integral of the down stroke,
Figure FDA0002933196460000016
integral of reference power for a complete stroke cycle, POn the upper partIntegral of electric power for upstroke in current stroke cycle, PLower partThe electric power integral of the down stroke in the current stroke cycle is obtained, and P is the electric power integral in the current complete stroke cycle;
and 4, step 4: judging whether to finish hot washing, if so, meeting the requirements in continuous M stroke cycles
Figure FDA0002933196460000017
And is
Figure FDA0002933196460000018
And is
Figure FDA0002933196460000019
It indicates that the downhole wax deposit is effectively removed and the well wash may be terminated, where eta4、η5、η6The judgment threshold value represents the up stroke, the down stroke and the complete stroke when the well washing is finished;
and 5: collecting the electrical parameter data of the sucker rod pump oil pumping unit in real time after the well washing is finished, calculating the power integral values of the sucker rod pump oil pumping unit in the up stroke, the down stroke and the complete stroke, and judging whether the heat is required to be started or notWashing if the integral P of electric power in the complete stroke cycle is calculated to satisfy
Figure FDA00029331964600000110
Then the wax precipitation is performed in the well, the washing heat needs to be started, and the time t of starting the washing heat is recorded2Wherein eta7A judgment threshold value representing a complete stroke at the next well flushing;
step 6: updating the well washing period according to the time interval T of two continuous hot washing, wherein T is T2-t1。
2. The real-time monitoring method for the hot washing process of the sucker-rod oil well based on electric power as claimed in claim 1, wherein the step 1 comprises:
step 1.1: calculating real-time electric power of the sucker-rod pump pumping unit according to electric parameters of the sucker-rod pump pumping unit collected before well washing, wherein the electric parameters comprise three-phase voltage and three-phase current;
Figure FDA00029331964600000111
in the formula, Pt.jIs the electric power at the jth sampling point in the t-stroke cycle, Ut.jIs the voltage value at the jth sampling point in the t stroke cycle, It.jThe current value at the jth sampling point in the t-th stroke cycle,
Figure FDA00029331964600000112
is the power factor at the jth sampling point in the tth stroke cycle;
step 1.2: calculating the power integral of the sucker rod pump pumping unit in the periods of up stroke, down stroke and complete stroke:
Figure FDA0002933196460000021
Figure FDA0002933196460000022
Figure FDA0002933196460000023
Pt＝Pt. on+Pt. lower
In the formula, St.jIs the trapezoidal area enclosed by the electric power at the jth sampling point and the electric power at the (j +1) th sampling point in the t stroke cycle, Pt.j+1Is the electric power at the (j +1) th sampling point in the t-th stroke cycle, Δ x is the sampling interval, Pt. onIntegral of electric power on upstroke in the t-th stroke cycle, Pt. lowerIntegral of electric power for the down stroke in the t-th stroke cycle, PtIs the integration of the electrical power over the t-th full stroke cycle,nt.1the number of samples in the upstroke of the t-th stroke cycle,nt.2the number of sampling points in the lower stroke of the t-th stroke cycle;
step 1.3: calculating the average value of the electric power of the pumping unit with the rod pump during the up stroke of the pumping unit in m continuous stroke cycles
Figure FDA0002933196460000024
Integration as reference power for upstroke:
Figure FDA0002933196460000025
calculating the mean value of the electric power of the down stroke of the sucker rod pump pumping unit in m continuous stroke cycles
Figure FDA0002933196460000026
Integration of reference power as downstroke:
Figure FDA0002933196460000027
calculating the average value of electric power of sucker rod pump oil extractor in m continuous complete stroke cycles
Figure FDA0002933196460000028
Integration of reference power as a complete stroke cycle:
Figure FDA0002933196460000029
3. the real-time monitoring method for the hot washing process of the sucker-rod oil well based on electric power as claimed in claim 1, wherein the step 2 comprises:
step 2.1: recording the start time of well flushing as t1Calculating the real-time electric power of the sucker-rod pumping unit according to the electric parameters of the sucker-rod pumping unit collected in the well washing process;
Figure FDA0002933196460000031
in the formula, PjFor electric power at the jth sampling point in the current stroke cycle, UjIs the voltage value at the jth sampling point in the current stroke cycle, IjThe current value at the jth sampling point in the current stroke cycle,
Figure FDA0002933196460000032
the power factor at the jth sampling point in the current stroke cycle;
step 2.2: calculating the power integral of the sucker rod pump pumping unit in the periods of up stroke, down stroke and complete stroke:
Figure FDA0002933196460000033
Figure FDA0002933196460000034
Figure FDA0002933196460000035
Figure FDA0002933196460000036
in the formula, SjIs the trapezoidal area enclosed by the electric power at the jth sampling point and the electric power at the (j +1) th sampling point in the current stroke cycle, Pj+1Is the electric power at the (j +1) th sampling point in the current stroke cycle, and Δ x is the sampling interval, POn the upper partIntegral of electric power for upstroke in current stroke cycle, PLower partIs the electric power integral of the down stroke in the current stroke cycle, P is the electric power integral in the current complete stroke cycle, n1Number of sampling points of upstroke, n, in the current stroke cycle2The number of sampling points of the down stroke in the current stroke cycle.
4. A monitoring system for realizing the real-time monitoring method for the hot washing process of the sucker-rod oil well based on electric power as claimed in any one of claims 1 to 3, which is characterized by comprising an electric parameter acquisition device, an electric parameter processing device, a wireless WiFi transmission device and an upper computer, wherein the electric parameter acquisition device is electrically connected with the electric parameter processing device, and the electric parameter processing device is in data transmission with the upper computer through the wireless WiFi transmission device;
the electric parameter acquisition device is used for measuring electric parameters of the sucker rod pump pumping unit and outputting an electric power value in real time, wherein the electric parameters comprise three-phase voltage and three-phase current;
the electrical parameter processing device is used for calculating an electric power integral value in each stroke period and judging whether hot washing is needed or not;
the upper computer is used for realizing the interaction of human-computer information, displaying electric parameter data and electric power values in real time and displaying whether the current state is a hot washing state or not;
the wireless WiFi transmission device is used for realizing wireless signal transmission between the electrical parameter processing device and the upper computer.
CN202110153123.9A 2021-02-04 2021-02-04 Real-time monitoring method and system for hot washing process of sucker rod pump oil well based on electric power Pending CN112878989A (en)

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