CN113551699A - Method and equipment for detecting blockage of oil well pipeline - Google Patents
Method and equipment for detecting blockage of oil well pipeline Download PDFInfo
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- CN113551699A CN113551699A CN202111089825.1A CN202111089825A CN113551699A CN 113551699 A CN113551699 A CN 113551699A CN 202111089825 A CN202111089825 A CN 202111089825A CN 113551699 A CN113551699 A CN 113551699A
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Abstract
The application discloses a method and equipment for detecting oil well pipeline blockage, which are used for solving the technical problems that the existing oil well pipeline blockage detection mode is single and accurate judgment cannot be carried out. Wherein, the oil well pipeline comprises a pipe wall and an oil inlet; respectively acquiring the oil flow of each oil inlet corresponding to the current time interval and pressure wave reflection signals of each pipeline section of the oil well pipeline according to a preset time interval; calculating a difference value between the petroleum flow and the standard flow at each oil inlet, and determining the running state of each oil inlet according to the difference value; generating a corresponding pressure wave change curve according to the pressure wave reflection signals of the pipeline sections so as to determine the operating state of the pipeline sections according to the pressure wave change curve; and determining whether the oil well pipeline is blocked or not according to the operation state of each oil inlet and the operation state of each pipeline section, and determining the position where each pipeline section is blocked and the corresponding blocking amount according to the reflection time of the pressure wave in the pressure wave change curve.
Description
Technical Field
The application relates to the technical field of petroleum, coal gas and coking industry, in particular to a method and equipment for detecting oil well pipeline blockage.
Background
With the development and utilization of oil and gas resources by human beings, the transportation of oil through long-distance oil well pipelines becomes an indispensable transportation mode in the exploitation process. Along with the long-time operation of pipeline, solid such as paraffin, impurity easily piles up and causes the jam of oil well pipeline, influences the normal operating condition of pipeline, if in time handle the jam, still can cause the pipeline to leak or burst, easily arouses the potential safety hazard, still can cause the waste of resource. However, the existing oil well pipeline blockage detection method is single, and the blockage position and the blockage degree at the blockage position cannot be accurately judged.
Disclosure of Invention
The embodiment of the application provides a method and equipment for detecting oil well pipeline blockage, which are used for solving the technical problems that the existing oil well pipeline blockage detection mode is single and accurate judgment cannot be carried out.
On the one hand, the embodiment of the application provides a method for detecting the blockage of an oil well pipeline, wherein the oil well pipeline comprises a pipe wall and an oil inlet, and the method comprises the following steps: respectively acquiring the oil flow of each oil inlet corresponding to the current time interval and pressure wave reflection signals of each pipeline section of the oil well pipeline according to a preset time interval; calculating a difference value between the oil flow and the standard flow at each oil inlet, and determining the operation state of each oil inlet according to the difference value; generating a corresponding pressure wave change curve according to the pressure wave reflection signals of the pipeline sections so as to determine the operating state of the pipeline sections according to the pressure wave change curve; and determining whether the oil well pipeline is blocked or not according to the operation state of each oil inlet and the operation state of each pipeline section, and determining the position where each pipeline section is blocked and the corresponding blocking amount according to the reflection time of the pressure wave in the pressure wave change curve.
In an implementation manner of the present application, the oil flow rate of each oil inlet is measured by a liquid flow meter, and the liquid flow meter is disposed on the pipe wall facing the direction of the oil inlet; the pressure wave reflection signals of all the pipeline sections are obtained by measuring by a pressure wave meter; the pressure wave measuring instruments are arranged on the pipe wall at preset intervals, each pressure wave measuring instrument corresponds to each test valve, and each test valve is located at the initial end of each pipeline section.
In an implementation manner of the present application, determining an operation state of each of the pipeline segments according to the pressure wave variation curve specifically includes: determining a maximum peak value and a minimum trough value of the pressure wave change curve; determining the running state of the corresponding pipeline section as a normal running state under the condition that the maximum wave crest value is greater than or equal to a first preset value and the minimum wave trough value is less than or equal to a second preset value; determining that the operation state of the corresponding pipeline section is an abnormal operation state under the condition that a wave peak value smaller than the first preset value exists in the pressure wave change curve or a wave valley value larger than the second preset value exists; wherein the abnormal operation state at least comprises any one of the following items: partial incomplete blockage, partial complete blockage.
In an implementation manner of the present application, in a case that a peak value smaller than the first preset value exists in the pressure wave variation curve or a valley value larger than the second preset value exists, determining that an operation state of a corresponding pipeline segment is an abnormal operation state specifically includes: determining each pressure wave in the pressure wave change curve and the corresponding wave crest and wave trough of each pressure wave; judging whether the wave crests and the wave troughs of the pressure waves have sudden changes or not, and if so, determining that the corresponding pipeline section is in a partial incomplete blockage state; and if the sudden change does not exist, determining that the corresponding pipeline section is in a local complete blockage state.
In an implementation manner of the present application, determining a location where each of the pipeline segments is blocked and a corresponding blocking amount according to a reflection time of a pressure wave in the pressure wave variation curve specifically includes:
under the condition that the pipeline section is partially not completely blocked, determining a first time difference between the time corresponding to the crest abrupt change position of the first pressure wave in the pressure wave change curve and the time corresponding to the rising edge and a second time difference between the times corresponding to the falling edge; determining the propagation speed of the pressure wave reflection signal, and calculating the distance between the blockage position and the initial end of the pipeline section and the blockage length according to the propagation speed, the first time difference and the second time difference; determining the amplitudes of the pressure wave incident signal and the pressure wave reflected signal, respectively, and the cross-sectional area of the pipe section to calculate the corresponding blockage areas; and calculating the blockage amount of the pipeline section according to the blockage area and the blockage length.
In an implementation manner of the present application, determining a location where each of the pipeline segments is blocked and a corresponding blocking amount according to a reflection time of a pressure wave in the pressure wave variation curve specifically includes: determining a third time difference corresponding to a crest of a first pressure wave in the pressure wave change curve under the condition that the pipeline section is partially and completely blocked; calculating the distance between the blocking position and the initial end of the pipeline section according to the propagation speed and the third time difference; determining a pressure wave reflection signal corresponding to the tail end of the pipeline section, generating a pressure wave change curve aiming at the tail end of the pipeline section according to the pressure wave reflection signal, and obtaining the distance between a blocking position and the tail end of the pipeline section according to the pressure wave change curve aiming at the tail end of the pipeline section; and calculating the blockage amount of the pipeline section according to the distance between the blockage position and the initial end and the tail end of the pipeline section, and the length and the cross sectional area of the pipeline section.
In one implementation of the present application, the method further comprises: determining the number of pressure waves in a single period according to the pressure wave change curve under the condition that the operation state of the pipeline section is an abnormal operation state; if only a single pressure wave exists in the single period, determining that the pipeline section is singly blocked; and if continuous pressure waves exist in the single period, determining that the pipeline section is discontinuously blocked at a plurality of positions.
In one implementation of the present application, the method further comprises: under the condition that the pipeline section is partially and incompletely blocked, predicting the time length of the pipeline section reaching the complete blockage according to the blockage amount of the pipeline section in the current time interval and the cross sectional area and the length of the pipeline section; and training a neural network model according to the blocking amount of the pipeline section, the pressure wave change curve and the time length of the pipeline section reaching the complete blocking so as to obtain a blocking prediction model for predicting the oil well pipeline blocking time length.
In one implementation of the present application, before calculating the difference between the oil flow rate at each of the oil inlets and the standard flow rate, the method further comprises: determining the cross-sectional area, the depth of the oil inlet and the oil flow rate corresponding to the depth of the oil inlet; and determining the standard oil flow of the oil inlets according to the oil flow velocity and the cross sectional area aiming at each oil inlet.
On the other hand, this application embodiment still provides a detection equipment of oil well pipeline jam, and equipment includes: a processor; and a memory having executable code stored thereon, which when executed, causes the processor to perform a method of detecting a blockage in a well tubing as described above.
The method and the equipment for detecting the blockage of the oil well pipeline provided by the embodiment of the application have the following beneficial effects at least: the real-time operation data of the oil well pipeline is acquired and processed according to the preset time interval, so that the normal detection of the pipeline is ensured, and the data processing pressure is reduced; the oil inlet and each pipeline section are detected in real time, and the running state of the oil well pipeline is monitored in real time from multiple angles, so that the running safety of the pipeline is further improved; the running state of the pipeline section is judged according to the pressure wave change curve, the running state can be determined more visually, the blocking position can be positioned more accurately, the corresponding blocking amount is calculated, and the normal running of the oil well pipeline is ensured.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
FIG. 1 is a flow chart of a method for detecting plugging in an oil well pipe according to an embodiment of the present disclosure;
fig. 2 is a pressure wave variation graph corresponding to a normal operation state of an oil well pipeline provided by the embodiment of the present application;
FIG. 3 is a pressure wave variation graph corresponding to a partially incompletely blocked state of an oil well pipeline provided by an embodiment of the present application;
fig. 4 is a pressure wave variation graph corresponding to a partially completely blocked state of an oil well pipeline provided by the embodiment of the application;
FIG. 5 is a graph showing pressure wave variation corresponding to multiple intermittent blockages in a pipeline section according to an embodiment of the present disclosure;
fig. 6 is a schematic internal structural diagram of the detection apparatus for detecting plugging of an oil well pipeline according to the embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The technical solutions proposed in the embodiments of the present application are described in detail below with reference to the accompanying drawings.
Fig. 1 is a flowchart of a method for detecting blockage of an oil well pipeline according to an embodiment of the present disclosure. As shown in fig. 1, the method for detecting the blockage of the oil well pipeline provided by the embodiment of the application mainly comprises the following steps:
101. the server respectively acquires the oil flow of each oil inlet corresponding to the current time interval and the pressure wave reflection signals of each pipeline section of the oil well pipeline according to the preset time interval.
The server acquires the oil flow of each oil inlet and the pressure wave reflection signal of each pipeline section according to a preset time interval, and accordingly, the running state of the oil well pipeline in the current time interval is judged.
Specifically, a plurality of oil inlets are formed in the pipe wall of the oil well pipeline, and oil can flow to the pipeline through the oil inlets and is conveyed to the ground. The inner pipe wall facing the oil inlet direction is provided with a liquid flowmeter, and the oil flow of the oil inlet can be measured through the liquid flowmeter. In addition, because the oil well pipeline is long in length, in order to improve detection accuracy, the oil well pipeline is divided into a plurality of pipeline sections according to preset intervals. The outer wall of the starting end of each pipeline section is provided with a test valve, the inner wall of the pipeline corresponding to the position of the test valve is provided with a pressure wave meter, and each pressure wave meter corresponds to each test valve. Pressure can be generated in the moment of closing the test valve and is transmitted to the downstream of the pipeline and finally reflected to the initial end of the pipeline section, pressure wave reflection signals aiming at the pipeline section can be obtained through a pressure wave meter arranged on the inner wall of the pipeline, and whether the corresponding pipeline section is blocked in the current time interval or not can be determined through analyzing the pressure wave reflection signals.
It should be noted that the server is used as an execution subject, and is only exemplary, and is not specifically limited in the embodiments of the present application.
102. And the server calculates the difference between the oil flow and the standard flow at each oil inlet, and determines the running state of each oil inlet according to the difference.
The server determines whether each oil inlet is blocked and the blocking degree by judging the difference value between the oil flow flowing to each oil inlet in the current time interval and the standard flow.
In one embodiment, after the oil well pipe is driven into the oil reservoir, the jet drill head opens a plurality of oil inlets in the pipe wall by means of high pressure jet. The depths of the oil inlets are different, the server determines the cross-sectional area, the depth of the oil inlets and the oil flow rate corresponding to the depths, and therefore the standard oil flow of the oil inlets is calculated according to the oil flow rate and the cross-sectional area.
Further, the server determines the actual oil flow of each oil inlet in the current time interval, compares the actual oil flow with the corresponding standard oil flow and calculates the difference value of the actual oil flow and the standard oil flow. And aiming at each oil inlet, determining the interval to which the flow difference value corresponding to the oil inlet belongs according to the difference value interval defined in advance so as to determine the blockage grade of the oil inlet, namely, unblocked, slightly blocked and seriously blocked.
This application is through setting up fluidflowmeter in each oil inlet department and acquireing into oil volume, and whether the oil flow that can real-time supervision oil inlet reduces to it blocks up the degree to confirm it, in time dredges the oil inlet, ensures the normal use of oil well pipeline.
103. And the server generates a corresponding pressure wave change curve according to the pressure wave reflection signals of the pipeline sections so as to determine the operating state of the pipeline sections according to the pressure wave change curve.
After receiving the pressure wave reflection signals from the pressure wave measuring instruments, the server generates corresponding pressure wave change curves for more intuitively acquiring the current running states of the pipeline sections, and further analyzes wave peak values and wave trough values in the pressure wave change curves to determine the running states of the pipeline sections.
Specifically, by periodically emitting the pressure wave, a corresponding continuous variation curve of the pressure wave can be formed. Each wave band in the pressure wave change curve represents a plurality of corresponding pressure waves, the wave crest and the wave trough represent the pressure magnitude at the beginning end of the pipeline section, and the current pressure wave intensity can be seen from the difference value between the wave crest and the wave trough. When a pipe section is blocked, the internal resistance of the pipe is large, the oil flow rate is small, and therefore the amplitude of the pressure wave at this time is small compared with the amplitude when the pipe section is not blocked.
Further, the server determines the maximum wave peak value and the minimum wave trough value in the current pressure wave change curve, and compares the maximum wave peak value and the minimum wave trough value with the first preset value and the second preset value respectively to determine the operation state of the pipeline section. The first preset value and the second preset value are the minimum amplitude values of the oil well pipeline in a normal operation state.
Further, the server determines that the operation state of the corresponding pipeline segment is a normal operation state under the condition that the maximum wave crest value is greater than or equal to the first preset value and the minimum wave trough value is less than or equal to the second preset value. For example, as shown in fig. 2, in a pressure wave variation graph corresponding to a normal operation state of an oil well pipeline, the abscissa represents reflection time, the ordinate represents corresponding pressure magnitude, and a peak value and a valley value corresponding to each pressure wave are relatively stable, so that the pipeline section is in the normal operation state.
The pressure fluctuation can be visually seen by measuring the pressure inside the pipeline through a pressure wave change curve, and the operation condition of the pipeline section in the current time interval is determined according to the wave peak value and the wave trough value, so that the real-time detection of the oil well pipeline is realized.
In an embodiment of the application, the server determines that the operation state of the corresponding pipeline section is an abnormal operation state when a wave peak value smaller than a first preset value exists in a pressure wave change curve or a wave valley value larger than a second preset value exists in the pressure wave change curve; wherein, the abnormal operation state at least comprises any one of the following items: partial incomplete blockage, partial complete blockage.
Specifically, the server determines pressure waves of each period in the current time interval and peaks and valleys of each pressure wave according to the pressure wave change curve. If the wave crest and the wave trough of the pressure wave do not have the condition of sudden change, namely the amplitude is suddenly increased, the condition that the pressure wave reflection signal is reflected to the position of the pressure wave meter at the moment of contacting the blockage and does not pass through the blockage to cause the sudden pressure change exists, so the pipeline section at the moment is in a local complete blockage state. If there is sudden change in the wave crest and wave trough of the pressure wave, it means that after the valve is closed, the beginning end of the pipe section generates pressure wave flowing to the downstream of the pipe, when the pressure wave meets the edge of the blocking object, one part is reflected to the beginning end of the pipe section, the other part enters the gap in the blocking object, the pressure is increased along with the reduction of the inner diameter of the pipe, and the size of the pressure wave is suddenly increased. When the pressure wave propagates to the other edge of the plug through the gap in the plug, since there is no plug, the inner diameter of the pipe becomes large, and then the pressure wave returns to the beginning of the pipe section in the opposite direction, so that the pipe section is in a partially incompletely plugged state. It should be noted that, for the convenience of calculation, the embodiment of the present application defaults to uniform pipe blockage.
For example, the pressure wave variation graph corresponding to the partially and incompletely blocked state of the oil well pipeline shown in fig. 3 and the pressure wave variation graph corresponding to the partially and completely blocked state of the oil well pipeline shown in fig. 4. Assuming that the first preset value is 250 and the second preset value is 50, comparing the peak value and the valley value of fig. 2 with those of fig. 3 and 4, it can be known that the maximum peak value and the minimum peak value of the pressure wave waveforms in fig. 3 and 4 are both smaller than the first preset value and larger than the second preset value, so that the current pipeline section is in an abnormal operation state. The wave crests and wave troughs in the figure 3 have no abrupt change, so that the pipeline section is in a partially and completely blocked state at the moment; in fig. 4, the wave crest has a suddenly increased part, and the wave trough has a correspondingly suddenly reduced part, and at the moment, the pipeline section is in a partially incomplete blockage state.
Whether this application embodiment has the sudden change through crest and trough in the pressure wave change curve, determines which kind of abnormal operation state is in to present pipeline, has realized the accurate discernment of jam, also provides the reference for adopting what kind of processing method simultaneously, has avoided having used the stifled mode of separating mildly relatively under blockking up comparatively serious circumstances, has avoided the wasting of resources and the mediation that causes unreasonably because of the processing measure not thorough.
In one embodiment, when a pipeline segment is abnormally operated, the server determines whether the pipeline segment is singly blocked or is blocked at a plurality of positions according to the number of pressure waves, so that more reasonable treatment measures can be adopted.
Specifically, the server determines the number of pressure waves in a single period in a pressure wave change curve, and if only one pressure wave exists, the pipeline section is singly blocked; if the pressure wave is followed by other pressure waves within a single period, the pipe section is intermittently plugged at a plurality of locations. For example, assuming that a single cycle is 1s, only one pressure wave in one cycle in fig. 3 and 4 is a single occlusion. As shown in fig. 5, in a pressure wave variation curve corresponding to multiple intermittent blockages of a pipeline section, two pressure waves exist within a period of 0-1 s, which indicates that the pipeline section is intermittently blocked at multiple places.
This application embodiment is independent or a plurality of through further confirming the jam section, has realized the accurate discernment to pipeline jam, simultaneously, is favorable to adopting more reasonable mode to remove pertinence processing jam department, has avoided the condition emergence of lou examining, processing the omission.
It should be noted that step 102 may be executed first and then step 103 is executed, or step 103 may be executed first and then step 102 is executed, or step 102 and step 103 may be executed simultaneously, which is not limited in the embodiment of the present application. In addition, the following examples are all carried out in the case of individual plugging of a line section, and the case of multiple plugging can also be carried out on the basis of the examples shown below.
104. And the server determines whether the oil well pipeline is blocked or not according to the operation state of each oil inlet and the operation state of each pipeline section, and determines the position where each pipeline section is blocked and the corresponding blocking amount according to the reflection time of the pressure wave in the pressure wave change curve.
On one hand, the server measures the oil flow of the current time interval according to the liquid flow meters arranged at the oil inlets, and the current oil inlet blockage degree is determined and the specific oil inlet position is positioned at the same time; on the other hand, the server determines the position of the blockage in the pipeline section and the corresponding blockage amount according to the reflection time of the pressure wave in the pressure wave change curve corresponding to each pipeline section.
In one embodiment, the server determines the location and amount of blockage based on the first received pressure wave reflection signal when the pipe segment is in a partially or partially incomplete blockage state. Because pipeline wear can make pressure wave consume the energy in the propagation process gradually, adopt the pressure wave of first cycle to judge and can improve the accuracy.
Specifically, the server determines a first time difference between a time corresponding to the abrupt change in the peak of the first pressure wave in the pressure wave variation curve and a time corresponding to the rising edge, and a second time difference between times corresponding to the falling edge. Wherein the first time difference represents the time required for the signal to travel from the beginning of the pipe segment to the edge of the jam location, and the second time difference represents the time required for the signal to travel from the edge of the jam location to the other edge. For example, in FIG. 3,
a first time difference is indicated which is,
representing a second time difference.
Further, a propagation velocity of the pressure wave reflection signal in the well pipe is determined. And calculating the product of the first time difference and the propagation speed to obtain a calculation result, namely the distance between the edge of the blocked section and the initial end of the pipeline section, so that the specific blocked position in the pipeline section is determined. And calculating the product of the second time difference and the propagation speed to obtain a calculation result, namely the distance between the other edge of the blockage section and the initial end of the pipeline section. And (4) determining the blockage length by making a difference between the two calculation results.
Further, the amplitude of the pressure wave incident signal and the amplitude of the pressure wave reflected signal and the cross section area of the pipeline section are respectively determined, the inner diameter of the pipeline corresponding to the blocking position is obtained through calculation, and then the difference value between the cross section area of the pipeline section and the inner diameter of the pipeline at the blocking position is calculated, so that the corresponding blocking area is obtained.
Further, according to the plugging area and the plugging length, the plugging amount of the pipeline section is calculated.
According to the oil well pipeline blocking section positioning method and device, the blocking position and the corresponding blocking amount are determined, accurate positioning of the oil well pipeline blocking section is achieved, a suitable control strategy is favorably adopted in the pipeline running process according to the blocking amount, and pipeline damage caused by untimely monitoring is avoided.
In one embodiment, in the event that a pipe segment has not been completely plugged, the server determines how long the well pipe can still flow normally at the current plugging rate.
Specifically, the server calculates the capacity of the pipeline section according to the cross-sectional area and the length of the pipeline section, and then predicts the time required for the pipeline section to reach a full blockage state according to the blockage amount of the pipeline section and the capacity of the pipeline section in the current time interval.
And further, training a neural network model according to the blocking amount of the pipeline section, the pressure wave change curve and the time length of the pipeline section reaching the complete blocking so as to obtain a blocking prediction model for predicting the oil well pipeline blocking time length.
When each pipeline section of the oil well pipeline is slightly blocked, dredging measures cannot be generally taken, only when the blocking amount reaches a preset threshold value, a corresponding blockage removing mode is adopted according to the current blocking position and the blocking degree, so that waste of manpower and material resources is avoided to a certain extent, and meanwhile, blockage removing resources can be utilized to the maximum extent, so that a blockage prediction model is trained to provide reference for when blockage removal is carried out. In addition, the processing pressure can be reduced by setting the time interval to calculate and analyze the acquired real-time operation data of the pipeline, but the abnormal conditions occurring in the non-calculation time period cannot be monitored at the first time, so that the potential safety hazard is easily caused, and the residual time is predicted by the blockage prediction model, so that the serious blockage of the pipeline caused by untimely information acquisition can be avoided, and the potential safety hazard is caused.
In one embodiment, in the case of a partially completely blocked pipe segment, first, the server determines a third time difference corresponding to the peak of the first pressure wave in the pressure wave profile. Secondly, the distance between the blockage position and the beginning of the pipeline section is calculated according to the propagation speed of the pressure wave reflection signal in the pipeline and the third time difference. For example, in FIG. 4,
representing a third time difference.
Further, close the test gate of locating pipeline section end promptly next pipeline section, with the same mode, the server generates corresponding pressure wave change curve to according to the pressure wave change curve to pipeline section end, determine the distance between jam position and the pipeline section end.
Furthermore, the server can calculate the blocking length according to the length of the pipeline section and the distance between the blocking position and the initial end and the tail end of the pipeline section respectively. Then, the amount of blockage of the pipe section is calculated based on the length of the blockage and the cross-sectional area of the pipe section.
According to the method for detecting the blockage of the oil well pipeline, the real-time operation data of the oil well pipeline is acquired and processed according to the preset time interval, so that the normal detection is ensured, and the data processing pressure is reduced; the oil inlet and each pipeline section are detected in real time, and the running state of the oil well pipeline is monitored in real time from multiple angles, so that the running safety of the pipeline is further improved; the running state of the pipeline section is judged according to the pressure wave change curve, the running state can be determined more visually, the blocking position can be positioned more accurately, the corresponding blocking amount is calculated, and the normal running of the oil well pipeline is ensured.
Fig. 6 is a schematic structural diagram of an internal structure of the oil well pipe blockage detection device provided by the embodiment of the application. As shown in fig. 6, the apparatus includes: at least one processor 601; and a memory 602 communicatively coupled to the at least one processor 601; wherein the memory 602 stores instructions executable by the at least one processor 601 to enable the at least one processor 601 to: respectively acquiring the oil flow of each oil inlet corresponding to the current time interval and pressure wave reflection signals of each pipeline section of the oil well pipeline according to a preset time interval; calculating a difference value between the petroleum flow and the standard flow at each oil inlet, and determining the running state of each oil inlet according to the difference value; generating a corresponding pressure wave change curve according to the pressure wave reflection signals of the pipeline sections so as to determine the operating state of the pipeline sections according to the pressure wave change curve; and determining whether the oil well pipeline is blocked or not according to the operation state of each oil inlet and the operation state of each pipeline section, and determining the position where each pipeline section is blocked and the corresponding blocking amount according to the reflection time of the pressure wave in the pressure wave change curve.
The embodiments in the present application are described in a progressive manner, and the same and similar parts among the embodiments can be referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the apparatus embodiment, since it is substantially similar to the method embodiment, the description is relatively simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (10)
1. A method of detecting plugging in an oil well pipe, the oil well pipe comprising a pipe wall, an oil inlet, the method comprising:
respectively acquiring the oil flow of each oil inlet corresponding to the current time interval and pressure wave reflection signals of each pipeline section of the oil well pipeline according to a preset time interval;
calculating a difference value between the oil flow and the standard flow at each oil inlet, and determining the operation state of each oil inlet according to the difference value; and
generating a corresponding pressure wave change curve according to the pressure wave reflection signals of the pipeline sections, and determining the operating state of the pipeline sections according to the pressure wave change curve;
and determining whether the oil well pipeline is blocked or not according to the operation state of each oil inlet and the operation state of each pipeline section, and determining the position where each pipeline section is blocked and the corresponding blocking amount according to the reflection time of the pressure wave in the pressure wave change curve.
2. A method for detecting plugging in an oil well pipe as claimed in claim 1,
the oil flow of each oil inlet is measured by a liquid flow meter, and the liquid flow meter is arranged on the pipe wall facing to the direction of the oil inlet;
the pressure wave reflection signals of all the pipeline sections are obtained by measuring by a pressure wave meter; the pressure wave measuring instruments are arranged on the pipe wall at preset intervals, each pressure wave measuring instrument corresponds to each test valve, and each test valve is located at the initial end of each pipeline section.
3. The method according to claim 2, wherein determining the operating state of each of the pipe sections according to the pressure wave profile comprises:
determining a maximum peak value and a minimum trough value of the pressure wave change curve;
determining the running state of the corresponding pipeline section as a normal running state under the condition that the maximum wave crest value is greater than or equal to a first preset value and the minimum wave trough value is less than or equal to a second preset value;
determining that the operation state of the corresponding pipeline section is an abnormal operation state under the condition that a wave peak value smaller than the first preset value exists in the pressure wave change curve or a wave valley value larger than the second preset value exists; wherein the abnormal operation state at least comprises any one of the following items: partial incomplete blockage, partial complete blockage.
4. The method according to claim 3, wherein determining that the operation state of the corresponding pipe segment is an abnormal operation state when a peak value smaller than the first preset value exists in the pressure wave variation curve or a valley value larger than the second preset value exists in the pressure wave variation curve specifically comprises:
determining each pressure wave in the pressure wave change curve and the corresponding wave crest and wave trough of each pressure wave;
judging whether the wave crests and the wave troughs of the pressure waves have sudden changes or not, and if so, determining that the corresponding pipeline section is in a partial incomplete blockage state; and if the sudden change does not exist, determining that the corresponding pipeline section is in a local complete blockage state.
5. The method according to claim 4, wherein the determining the position of the pipeline segment where the pipeline segment is blocked and the corresponding blocking amount according to the reflection time of the pressure wave in the pressure wave variation curve comprises:
under the condition that the pipeline section is partially not completely blocked, determining a first time difference between the time corresponding to the crest abrupt change position of the first pressure wave in the pressure wave change curve and the time corresponding to the rising edge and a second time difference between the times corresponding to the falling edge;
determining the propagation speed of the pressure wave reflection signal, and calculating the distance between the blockage position and the initial end of the pipeline section and the blockage length according to the propagation speed, the first time difference and the second time difference;
determining the amplitudes of the pressure wave incident signal and the pressure wave reflected signal, respectively, and the cross-sectional area of the pipe section to calculate the corresponding blockage areas;
and calculating the blockage amount of the pipeline section according to the blockage area and the blockage length.
6. The method according to claim 5, wherein the determining the position of the pipeline segment where the pipeline segment is blocked and the corresponding blocking amount according to the reflection time of the pressure wave in the pressure wave variation curve comprises:
determining a third time difference corresponding to a crest of a first pressure wave in the pressure wave change curve under the condition that the pipeline section is partially and completely blocked;
calculating the distance between the blocking position and the initial end of the pipeline section according to the propagation speed and the third time difference;
determining a pressure wave reflection signal corresponding to the tail end of the pipeline section, generating a pressure wave change curve aiming at the tail end of the pipeline section according to the pressure wave reflection signal, and obtaining the distance between a blocking position and the tail end of the pipeline section according to the pressure wave change curve aiming at the tail end of the pipeline section;
and calculating the blockage amount of the pipeline section according to the distance between the blockage position and the initial end and the tail end of the pipeline section, and the length and the cross sectional area of the pipeline section.
7. A method of detecting plugging in an oil well conduit as claimed in claim 4, further comprising:
determining the number of pressure waves in a single period according to the pressure wave change curve under the condition that the operation state of the pipeline section is an abnormal operation state;
if only a single pressure wave exists in the single period, determining that the pipeline section is singly blocked;
and if continuous pressure waves exist in the single period, determining that the pipeline section is discontinuously blocked at a plurality of positions.
8. A method of detecting plugging in an oil well conduit according to claim 5, further comprising:
under the condition that the pipeline section is partially and incompletely blocked, predicting the time length of the pipeline section reaching the complete blockage according to the blockage amount of the pipeline section in the current time interval and the cross sectional area and the length of the pipeline section;
and training a neural network model according to the blocking amount of the pipeline section, the pressure wave change curve and the time length of the pipeline section reaching the complete blocking so as to obtain a blocking prediction model for predicting the oil well pipeline blocking time length.
9. A method of detecting plugging in an oil well pipe as claimed in claim 1, wherein prior to calculating the difference between the oil flow rate at each of said oil inlet ports and a standard flow rate, said method further comprises:
determining the cross-sectional area, the depth of the oil inlet and the oil flow rate corresponding to the depth of the oil inlet;
and determining the standard oil flow of the oil inlets according to the oil flow velocity and the cross sectional area aiming at each oil inlet.
10. An apparatus for detecting plugging in a well pipe, the apparatus comprising:
a processor;
and a memory having executable code stored thereon, which when executed causes the processor to perform the method of detection of a blockage in a well tubing according to any of claims 1-9.
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