CN113653949B - Parameter identification method for preventing valve chamber from being mistakenly shut off when oil pipeline stops delivering oil - Google Patents
Parameter identification method for preventing valve chamber from being mistakenly shut off when oil pipeline stops delivering oil Download PDFInfo
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- CN113653949B CN113653949B CN202111111572.3A CN202111111572A CN113653949B CN 113653949 B CN113653949 B CN 113653949B CN 202111111572 A CN202111111572 A CN 202111111572A CN 113653949 B CN113653949 B CN 113653949B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
- G06F17/10—Complex mathematical operations
Abstract
The invention discloses a parameter identification method for preventing valve chamber from being mistakenly shut off when an oil pipeline stops conveying, and belongs to the technical field of oil and gas pipelines. Which comprises the following steps: collecting real-time pressure data of all valve chambers of an oil pipeline; calculating the pressure drop rate of all valve chambers through pressure data acquired in real time to obtain a relation graph of the pressure drop rate and time; and analyzing the relation graph of the pressure drop rate of all the valve chambers and the time, and if the obtained pressure drop rate change accords with the pressure drop rate change in the pipeline stopping process, the stop valve is not closed. The parameter identification method for preventing the valve chamber from being mistakenly shut off when the oil pipeline stops delivering has the characteristics of simple operation and accurate result, and the shut-off operation of the shut-off valve is organically combined with a data system, so that the mistaken shut-off of the shut-off valve under the condition of stopping delivering is prevented.
Description
Technical Field
The invention belongs to the technical field of oil and gas pipelines, and relates to a parameter identification method for preventing valve chamber from being mistakenly shut off when an oil pipeline stops delivering.
Background
Once the oil pipeline leaks, the pipeline conveying efficiency is reduced, great economic loss and environmental pollution are caused, accidents such as fire and explosion can be caused, therefore, the oil pipeline can be provided with a plurality of valve chambers along the pipeline, and once the pipeline leaks, the block valve in the valve chamber is immediately closed to prevent oil leakage. At present, a valve chamber judges whether leakage occurs in a pipeline or not by monitoring whether the pressure drop rate at the valve chamber reaches a threshold value or not, and then whether valve closing is adopted or not is determined.
When the oil pipeline stops conveying, pressure reduction waves are generated in the pipeline, the valve chamber can also monitor pressure reduction, and if the generated pressure reduction rate reaches a threshold value, the cut-off valve is also closed. The oil pipeline valve chamber can only monitor the pressure change of the front and rear pipe sections of the valve chamber, and the pressure change condition of the whole pipeline can not be obtained, so that the error shutoff of the shutoff valve is easily caused. When the block valve is switched off by mistake, serious water hammer can be caused, overpressure in the pipe is caused, and the safe operation of the pipe is threatened.
According to literature investigation, in the existing patent, an oil pipeline leakage monitoring system provided by patent CN107524926A, namely an oil pipeline leakage monitoring system, can carry out oil theft or leakage monitoring in the pipeline transportation and transportation stop states, evaluate the pipeline aging problem and early warn, but does not mention a valve false turn-off identification method in the pipeline transportation stop state; the patent CN108763809a "a method for stopping transportation of a complex oil transportation pipeline system during a leakage accident" determines a method for stopping transportation of a pipeline system by establishing a hydraulic transient mathematical model during the process of stopping transportation of the pipeline system, and gives an action scheme of a valve during the process of stopping transportation, so that the operation of stopping transportation of the pipeline is safely and effectively performed under specified constraint conditions, but a method for identifying the mistaken shutoff of the valve during the process of stopping transportation of the pipeline is not mentioned. Therefore, no identification method aiming at the mistaken shutoff of the oil pipeline valve chamber under the condition of stopping the oil pipeline exists at present, and the patent is very necessary for ensuring the safe operation of the oil pipeline.
Disclosure of Invention
The invention provides a method for preventing a shut-off valve from being turned off by mistake by acquiring real-time pressure data of a pipeline through an oil pipeline data acquisition system and performing parameter identification so as to solve the problem of the false shut-off of a valve chamber during the process of stopping the oil pipeline.
The invention is realized by the following technical scheme:
the parameter identification method for preventing the valve chamber from being mistakenly shut off when the oil pipeline stops the oil transportation comprises the following steps of:
step 1, collecting real-time data of all valve chambers of an oil pipeline;
step 2, calculating the pressure drop rate of all valve chambers through pressure data acquired in real time to obtain a relation graph of the pressure drop rate and time;
and 3, analyzing the relation graph of the pressure drop rate of all the valve chambers and the time, and if the obtained pressure drop rate change accords with the pressure drop rate change in the pipeline stopping process, not shutting off the shut-off valve.
In step 1, collecting real-time data of all valve chambers of the oil pipeline, including real-time pressure of the valve chambers.
In step 2, calculating the pressure drop rate of all valve chambers through the pressure data acquired in real time, and obtaining a pressure drop rate and time relation graph which comprises the following contents:
s21, calculating the pressure drop rate h at each moment in the valve chamber according to the acquired real-time pressure P of each valve chamber and the time T corresponding to the pressure, wherein the calculation formula is shown as formula (1):
in the formula, T i For the ith moment of data acquisition, P i At a time T i Valve chamber pressure collected;
s22, at a time T i As abscissa, pressure drop rate h i Drawing a graph of the pressure drop rate of all valve chambers and time as an ordinate;
in step 3, analyzing the relation graph of the pressure drop rate of all valve chambers and time, and if the obtained pressure drop rate change accords with the pipeline stop pressure drop rate change, the stop valve is not closed, and the judging method comprises the following steps:
s31, if the pressure drop rate changes of all valve chambers are the trend that the pressure drop rate is increased firstly and then reduced to a stable value, the pipeline leakage can be identified;
s32, if the pressure drop rate changes of all valve chambers are the trends of increasing, then decreasing and finally increasing, the pipeline can be identified as being in the process of stopping conveying;
and S33, if the pipeline stopping process is identified, the valve chamber block valve does not perform the closing operation.
By adopting the technical scheme, the invention can achieve the following beneficial effects:
(1) The parameter identification method for preventing the valve chamber from being turned off by mistake during the stop of the oil pipeline provided by the invention identifies the pipeline stop process by monitoring the real-time pressure of all valve chambers of the oil pipeline, so as to prevent the cut-off valve from being turned off by mistake.
(2) The method for preventing the mistaken shutoff parameter of the shut-off valve under the condition of stopping the transportation has the characteristics of simple operation and accurate result, and organically combines the shutoff operation of the shut-off valve with a data acquisition system to prevent the mistaken shutoff of the shut-off valve under the condition of stopping the transportation.
Drawings
FIG. 1 is a step diagram of a parameter identification method for preventing the valve chamber from being erroneously shut off when the oil pipeline is stopped.
FIG. 2 is a schematic diagram of a monitoring relationship of oil pipeline parameters in an embodiment of the present invention.
FIG. 3 is a graph showing the change in the pressure drop rate of all valve compartments after a leak in an oil delivery line in an embodiment of the present invention.
Fig. 4 is a graph of the rate of change of pressure drop in all valve chambers during shut-down of an oil pipeline in an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described below with reference to the accompanying drawings in the embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, a parameter identification method for preventing valve chamber from being erroneously shut off when an oil pipeline is stopped, comprises the following steps:
step 1, collecting real-time pressure of all valve chambers of an oil pipeline;
step 2, calculating the pressure drop rate of all valve chambers through pressure data acquired in real time to obtain a relation graph of the pressure drop rate and time;
and 3, analyzing a relation graph of the pressure drop rate of all valve chambers and time, and if the obtained pressure drop rate change accords with the pipeline transportation stop pressure drop rate change, not shutting off the block valve.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
A certain oil pipeline is provided with 4 block valve chambers along the line, and the schematic diagram of the pipeline structure is shown in figure 2. The pipe diameter specification is 508mm, and the pipeline whole line transport medium is crude oil. Now, according to the method of the present invention, whether each block valve of the pipeline needs to be closed is judged, and the implementation steps are as follows:
step 1, collecting real-time pressure and flow of each valve chamber along an oil pipeline, wherein the results are shown in table 1:
TABLE 1 result of collecting operation parameters of each valve chamber of a certain oil pipeline
And 2, drawing a pressure drop rate trend graph through continuously acquired data, wherein tables 2 and 3 respectively calculate the pressure drop rates of the valve chambers at different moments under different working conditions according to the acquired pressures at the valve chambers and the formula (1).
TABLE 2 working conditions 1 pipeline valve chamber pressure drop rate
TABLE 3 working conditions 2 pressure drop rate in the pipe valve chamber
The data in tables 2 to 3 are plotted with the pressure drop rate as ordinate and the time as abscissa, respectively, fig. 3 is a plot result for the operating condition 1, and fig. 4 is a plot result for the operating condition 2.
Step 3, analyzing the relation graph of the pressure drop rate of all valve chambers and the time, and if the obtained pressure drop rate change accords with the pipeline stop pressure drop rate change, the stop valve is not closed, and the judging steps and results are as follows:
s31, if the pressure drop rate changes as shown in the graph 3, and the pressure drop rate changes of all valve chambers are the trend that the pressure drop rate is increased firstly and then reduced to a steady value, the pipeline leakage can be identified;
s32, if the pressure drop rate changes are as shown in FIG. 4, the pressure drop rate changes of all valve chambers are the trends of increasing, then decreasing and finally increasing, and the pipeline can be identified as being in the process of stopping conveying;
and S33, if the identification result is the transmission stopping process, the stop valve is not closed. In the present embodiment, the shut-off valve is not closed for condition 2.
The invention provides a parameter identification method for preventing valve chamber false shutoff in the pipeline stopping process by combining pressure data of all valve chambers of an oil pipeline. The method utilizes the monitoring data of the whole-line valve chamber to identify whether the pipeline is in the process of stopping transmission, reduces the probability of mistaken shutoff of the valve chamber during the transmission stopping process, and ensures the safe operation of the oil pipeline.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (1)
1. A parameter identification method for preventing valve chamber from being mistakenly shut off when an oil pipeline stops delivering is characterized by comprising the following steps:
step 1, collecting real-time pressure data of all valve chambers of an oil pipeline;
step 2, calculating the pressure drop rate of all valve chambers through the pressure data acquired in real time to obtain a pressure drop rate and time relation diagram, which comprises the following contents:
s21, calculating the pressure drop rate h at each moment in the valve chamber according to the acquired real-time pressure P of each valve chamber and the time T corresponding to the pressure, wherein the calculation formula is shown as formula (1):
in the formula, T i For the ith moment of data acquisition, P i At a time T i The valve chamber pressure collected at the time;
s22, at time T i As abscissa, the rate of pressure drop h i Drawing a graph of the pressure drop rate of all valve chambers versus time as an ordinate;
step 3, analyzing the relation graph of the pressure drop rate of all valve chambers and time, and if the obtained pressure drop rate change accords with the pipeline stop pressure drop rate change, the stop valve is not closed, and the judging method comprises the following steps:
s31, if the pressure drop rate changes of all valve chambers are the trend that the pressure drop rate is increased firstly and then reduced to a stable value, the pipeline leakage can be identified;
s32, if the pressure drop rate changes of all valve chambers are the trends of increasing, then decreasing and finally increasing, the pipeline can be identified as being in the process of stopping conveying;
and S33, if the pipeline stopping process is identified, the valve chamber block valve does not perform the closing operation.
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| CN114234053A (en) * | 2021-12-20 | 2022-03-25 | 中国石油天然气股份有限公司 | Method for identifying automatic cut-off condition of valve chamber of gas transmission trunk line containing compressor |
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