KR100906937B1 - A leak location measuring method and system for a fluid material pipeline, using an intersection of pressure lines - Google Patents

Abstract

A leak location measuring method and system are provided to estimate a leak location of a fluid pipe from pressure values easily by obtaining straight lines that the pressures measured at two sides of the leak position are extended and determining the intersection point of the straight lines as leak location. A leak location measuring method comprises a step of obtaining pressure correction values at A spot and B spot within a fluid pipe, a step in which pressure values are input from manometers installed at four spots when a leakage occurs between the A and B spots(S11), a step of searching for the location in which a straight line connecting the pressure of S spot and the pressure of A spot and a straight line connecting the pressure of D spot and the pressure of B spot meet(S12), and a step of determining the location as a leakage location(S13).

Description

A leak location measuring method and system for a fluid material pipeline, using an intersection of pressure lines}

According to the present invention, when leakage is generated by installing pressure gauges at four points in an oil pipe, the straight lines extending the pressure measured at two points on each side are obtained by reducing the pressure delivered to both sides at the leakage point. The present invention relates to a method and apparatus for estimating an intersection point as an oil leakage point.

In general, an oil pipeline is a pipe that transports oil or oil in a very long section of several tens or hundreds of kilometers. Oil pipelines for the transport of oil, etc., require oil storage and pressurization facilities in addition to oil pipelines. A reservoir is a place to store or ship petroleum, etc. transported to a pipeline, and a pressurized facility is a facility that maintains an appropriate pressure in the pipeline to transport oil. Pressurized facilities should be installed at oil refineries, which are the starting point of oil pipelines, and major intermediate points to maintain the proper pressure. On the other hand, the oil pipeline may not transport a single item like a gas pipeline or a crude oil pipeline, but may carry various oils such as gasoline, kerosene, diesel, and aviation through a single tube. At this time, the pressure should be maintained so that different oil types do not mix with each other.

The most important thing in managing these pipelines is to prevent leakage. Oil leakage in pipelines can be caused by a number of causes. For example, when an oil pipe pipe leaks due to aging, such as corrosion, leaks due to damage to the pipe due to a change in the ground, such as an earthquake, the pipe may be damaged by vibration in a nearby construction site. Oil spills are economically detrimental due to oil leakage, but spills into areas where oil pipelines are buried, which also has a significant negative impact on environmental issues. In particular, the cost is considerable because the damage due to leakage occurring in the adjacent area where the pipe is buried must be compensated. In addition, there are many cases where oil is drilled through the oil pipe to drain the oil itself. In particular, it is very difficult to establish a surveillance system at every point of a pipeline because pipelines are long, typically tens to hundreds of kilometers in length.

Therefore, it is one of the most desirable preventive measures to detect leakage of oil pipes and their position accurately and quickly and to take countermeasures immediately. That is, a technique for accurately and quickly detecting oil leakage and an oil leak position of an oil pipe is needed.

In addition to oil pipelines, various methods of detecting or locating leaks or leaks occurring in piping are introduced. For example, by installing a water detection sensor on the outside of the pipe to detect water leaking out when leaks occur, or by installing a pressure sensor on the pipe to detect water leaks by using a lower pressure. Is used. Such detection schemes may determine that the leak or leakage location is located where the detection sensor is located as soon as the detection sensor detects a leak or leakage. However, the sensing methods have a disadvantage in that the cost is too high to be installed and used in a tube having a very long length such as an oil pipeline.

A technique for automatically detecting a leak by detecting a drop in pressure is disclosed in [Korean Patent Registration No. 10-0496125 (published on May 16, 2013), "Leak Monitoring System"] (hereinafter, referred to as Prior Art 1). The prior art includes a plurality of control valves for regulating the supply of water supplied through each supply pipe; A plurality of pressure sensors installed in a supply pipe near each control valve to measure water pressure therein; The reference pressure value for comparing the measured pressure value received from the pressure sensor is set, and the control panel judging as a leak when the measured pressure is lower than the reference pressure or gradually lower than the set range; .

In addition, the technique of measuring the flow rate of each section of the fluid flow pipe to compare the amount to detect the leak [Korean Patent No. 10-0527011 (released November 9, 2005), "Water leak in the water pipe and automatic leak section Measurement method "] (hereinafter, referred to as Prior Art 2). The prior art relates to a method for automatically measuring the amount of leakage and leakage section of the water pipe line, it is blocked by the unit from the drainage water or water purification plant of the water supply to each customer, and the precision electronic flow meter and A device for transmitting the flow rate information is provided, and a method for measuring the amount of leakage compared to the flow rate of the inflow line and the summed flow rate of the discharge line by constantly monitoring the flow rate information transmitted from each installed flow meter is provided.

Prior art 1, as described above, in order to determine the location of the leak in the oil pipe by the pressure sensor method, it is necessary to install a pressure sensor at a constant narrow interval in the oil pipe. However, oil pipelines are quite long, ranging in length from tens to hundreds of kilometers, which requires a great deal of pressure sensors and their cost. In addition, in order to determine the location of leaks or leaks in each of the prior art 2 degrees section, it is necessary to install a flow meter for each section. Due to the length problem of the pipeline, which is the same reason as before, the prior art 2 is also expensive.

Therefore, in monitoring and countermeasures due to leakage of oil pipes, there is an urgent need for a technique capable of accurately identifying the location of oil leakage while using less flow or pressure sensors.

An object of the present invention is to solve the problems as described above, if the leak is generated by installing a pressure gauge at four points of the oil pipe, by the pressure reduction transmitted to both sides from the oil leakage point, two points on each side It is to provide a method and apparatus for obtaining straight lines extending the pressure measured at and estimating the point where these straight lines intersect as an oil leakage point.

In order to achieve the above object, the present invention receives oil pressure information from a pressure gauge installed at an oil supply point S, a delivery point D, an A point close to the oil supply point, and a B point close to the arrival point to find an oil leakage position. A method of estimating a leak location through measurement pressures of four points, the method comprising: (a) receiving a pressure measurement from a pressure gauge installed at the four points when leakage occurs between points A and B in the oil pipe; (b) finding a position where a straight line connecting the pressure at the point S and a pressure at the point A and a straight line connecting the pressure at the point D and the pressure at the point B meet with the position and the pressure as coordinates; (c) estimating the meeting position as the leakage position.

In addition, the present invention is a method for estimating the leakage position through the measured pressure of four points, characterized in that the position X _C where the straight line meets in the step (b) is calculated by [Equation 1].

[Equation 1]

P _S , P _D , P _A and P _B are the pressures at points S, D, A and B, respectively

X _S , X _D , X _A and X _B are positions at points S, D, A and B, respectively

In addition, the present invention is the oil supply point S, arrival point D of the oil pipe, the A point close to the oil supply point, the input of pressure information from the pressure gauge installed at the B point close to the arrival point of the four points to find the oil leakage position when the oil leakage A method for estimating a leak location through a measured pressure, the method comprising: (a) obtaining pressure correction values for points A and B in an oil pipe; (b) receiving leakage pressure measurement values from pressure gauges installed at the four points when leakage occurs between the A and B points in the oil pipe; (c) for each of the four points, correcting the leak pressure using the pressure correction value from the leak pressure measurement value, and calculating the leak head from the corrected leak pressure; (d) finding a position where a straight line connecting the leakage head of the S point and the leakage head of the A point and a straight line connecting the leakage head of the D point and the leakage head of the B point meet with the position and the head as coordinates; (e) estimating the meeting position as an oil leakage position.

In addition, the present invention is a method for estimating a leak location through the measured pressure of the four points, the step (a), (a1) receiving the normal pressure measurement from the pressure gauge installed at the four points in the normal state; (a2) for each of the four points, calculating the normal head from the normal pressure measurement; (a3) calculating a straight line of the head connecting the normal head of the S point and the D point using the position and the head as coordinates; (a4) for each point A and B, calculating the pressure of the corresponding point by the head on the straight line, and calculating a pressure correction value obtained by dividing the difference between the obtained pressure and the normal pressure measurement by the normal pressure measurement; Characterized in that it comprises a.

In addition, the present invention is a method for estimating the leakage position through the measured pressure of four points, the relationship between the pressure and the head is characterized by using [Equation 2].

[Formula 2]

Where H _k , P _k , and E _k are the head, pressure, and inherent position at point _k , respectively,

a is a constant, ρ is the fluid density.

k is S, D, A, B point.

In addition, the present invention is a method for estimating the leakage position through the measured pressure of the four points, the step (a3) is to obtain a straight line of the head of the head by [Equation 3],

[Equation 3]

Where H _S ⁰ , H _D ⁰ is the head at steady state at points S and D,

X _S , X _D , and X _k are the positions at points S, D, and k, respectively

k is A or B point,

Step (a4) is characterized in that to obtain the pressure correction value ΔP _k by Equation 4.

[Equation 4]

Where P _k ⁰ is the pressure at point k at steady state. a is a constant, ρ is the fluid density.

In addition, the present invention is a method for estimating a leak location through the measurement pressure of four points, step (d), the corrected leak pressure for the S point and D point, the corrected leak pressure is equal to the leak pressure measurement value, and For the point B, the corrected leakage pressure is obtained by [Equation 5].

[Equation 5]

Where P _k , P _k 'and ΔP _k are the pressure measurement at point k, the corrected pressure and the pressure correction value.

k is A or B point.

In addition, the present invention is a method of estimating the leakage position through the measured pressure of the four points, characterized in that the position where the straight line meets in the step (d) is calculated by [Equation 6].

[Equation 6]

H _S , H _D , H _A , H _B are the leakage heads at points S, D, A, and B, respectively,

X _S , X _D , X _A and X _B are positions at points S, D, A and B, respectively.

In addition, the present invention is the oil supply point S, arrival point D of the oil pipe, the A point close to the oil supply point, the input of pressure information from the pressure gauge installed at the B point close to the arrival point of the four points to find the oil leakage position when the oil leakage An apparatus for estimating an oil leakage position using a measurement pressure, comprising: a pressure information input unit for receiving pressure measurement values from a pressure gauge installed at four points when an oil leak occurs between points A and B in an oil pipe; An oil leak position calculation unit for finding a position where a straight line connecting the pressure at the point S and a pressure at the point A and a straight line connecting the pressure at the point D and the pressure at the point B meets the position and the pressure as coordinates; When leakage occurs between the points A and B in the oil pipe, the oil leakage position estimating unit receives the oil leakage pressure measurement values of the four points through the pressure information input unit, and estimates the meeting position calculated by the oil leakage position calculation unit as the oil leakage position. It characterized by including.

In addition, the present invention is characterized in the oil leakage position estimating apparatus through the measured pressure of the four points, characterized in that the oil leakage position estimating unit calculates the position where the straight line meets by [Equation 7].

[Formula 7]

P _S , P _D , P _A and P _B are the pressures at points S, D, A and B, respectively

X _S , X _D , X _A and X _B are positions at points S, D, A and B, respectively

In addition, the present invention is the oil supply point S, arrival point D of the oil pipe, the A point close to the oil supply point, the input of pressure information from the pressure gauge installed at the B point close to the arrival point of the four points to find the oil leakage position when the oil leakage An apparatus for estimating a leak position through a measured pressure, the apparatus comprising: a correction value calculator for calculating pressure correction values for points A and B in an oil pipe; A pressure information input unit for receiving a pressure measurement from the pressure gauge installed at the four points; A pressure head calculator for calculating head from pressure or calculating pressure from head; A leakage oil pressure correcting unit for finding points A and B in the oil pipe, the leakage oil pressure corrected using the pressure correction value from the leakage oil pressure measurement value; An oil leak position calculation unit for finding a position where a straight line connecting the leaky head of S point and the leaky head of A point and a straight line connecting the leaky head of D point and the leaky head of B point meet; When leakage occurs between the points A and B in the oil pipe, the leakage pressure measurement values of the four points are input through the pressure information input unit, and the head is obtained by correcting the leakage pressure through the leakage pressure correction unit. And a leakage location estimating unit for estimating the calculated meeting location as the leakage location.

In addition, the present invention is an oil leakage position estimation apparatus using the four points of the measurement pressure, the correction value calculation unit receives the normal pressure measurement value from the pressure gauge installed at the four points in the normal state to calculate the normal head, Using the head as a coordinate, the difference between the straight line connecting the normal head of the S point and the D point and the normal head of the A point and the B point is calculated as the head correction value, and the head correction value is applied to each of the A and B points. The pressure difference is calculated by dividing the difference between the corresponding pressure and the normal pressure measurement by the normal pressure measurement.

In addition, the present invention is characterized in that the oil leakage position estimation device through the measured pressure of the four points, by the equation (8), the head is calculated from the given pressure, or the pressure is calculated from the given head.

Equation 8

Where H _k , P _k , and E _k are the head, pressure, and inherent position at point _k , respectively,

a is a constant, ρ is the fluid density.

k is S, D, A, B point.

In addition, in the present invention, the leakage position estimation device through the measurement pressure of the four points, the correction value calculation unit calculates the straight line of the head by the equation (9),

[Equation 9]

Where H _S ⁰ , H _D ⁰ is the head at steady state at points S and D,

X _S , X _D , and X _k are the positions at points S, D, and k, respectively

k is A or B point,

It is characterized by calculating pressure correction value (DELTA) P _k by Formula (10).

Equation 10

Where P _k ⁰ is the pressure at point k at steady state. a is a constant, ρ is the fluid density.

In the present invention, the oil leakage position estimating apparatus using the measurement pressure of the four points, the leak pressure correcting unit, for the S point and the D point, the corrected leak pressure is equal to the leak pressure measurement value, and the point A For point B, the corrected leakage pressure is obtained by [Equation 11].

[Equation 11]

Where P _k , P _k 'and ΔP _k are the pressure measurement at point k, the corrected pressure and the pressure correction value.

k is A or B point.

In addition, the present invention is characterized in the oil leakage position estimation device through the measured pressure of the four points, characterized in that the oil leakage position calculation unit calculates the position where the straight line meets by [Equation 12].

Equation 12

H _S , H _D , H _A , H _B are the leakage heads at points S, D, A, and B, respectively,

X _S , X _D , X _A and X _B are positions at points S, D, A and B, respectively.

The present invention also relates to a computer-readable recording medium recording a method of estimating a leak location through the measurement pressures of the four points.

As described above, according to the method and apparatus for estimating a leak location through the measurement pressure of four points according to the present invention, when the leak occurs, the leak location is determined by the pressure measurement value of the pressure gauge installed in the oil pipe, so that only the pressure information is used. Simple and more accurate effects of estimating the leak location are obtained.

DETAILED DESCRIPTION Hereinafter, specific contents for carrying out the present invention will be described with reference to the drawings.

In addition, in describing this invention, the same code | symbol is attached | subjected and the repeated description is abbreviate | omitted.

First, the overall leak detection and leak location estimation system for the implementation of the present invention will be described with reference to FIG. 1 is a diagram illustrating an overall leak detection and leak location estimation system for implementing the present invention.

As shown in FIG. 1, as an example for implementing the present invention, the oil leakage position estimating apparatus 30 includes a pressure in an oil supply pipe 10 through which a fluid 12 such as oil flows from a pressure gauge 20 installed in an oil supply pipe 10. Receive measurements

The oil pipeline 10 connects between the reservoirs 13 capable of storing the fluid 12 such as oil over a long section of several tens or hundreds of kilometers, and a pressurized station 14 at an intermediate point of the connected pipeline 10. ) To maintain the pressure falling over the long section at the correct pressure. Here, the fluid such as oil 12 is any fluid that can flow like water other than oil. In addition, when the fluid is a fluid other than oil, terms related to oil such as an oil pipe, a low oil, and the like, which are described below, may be referred to by changing the term corresponding to the fluid. For example, when the fluid is water, the reservoir may be referred to as a reservoir and the oil pipe may be changed into a water pipe.

The pressure gauge 20 is installed at the oil feed point S or the storage point D of the oil storage 13 or the pressurization 14, and is also installed in the A point close to the said oil supply point, and the B point close to the said storage point. That is, at least four must be installed. The pressure gauges 21, 22, 23, and 24 of the four points measure the pressures P _S , P _D , P _A , P _B , and transmit them to the leak location estimating apparatus 30.

The leak location estimating apparatus 30 stores the pressure measurement value transmitted in real time in the database 40. On the other hand, when the monitoring time interval for the pressure (P) is greater than 1 second, that is, in the case of 1 minute, 10 minutes, 1 hour, etc., the average value of all the pressures (P) measured during that time is used. However, in order to reduce the measurement error, the average value may be excluded by excluding the maximum value, the minimum value, or the measurement value having a larger deviation than the other measurement values during the time. The oil leakage position estimating apparatus 30 estimates the oil leakage position using the pressure P information obtained as described above. However, since the estimation of the oil leakage position uses information on the pressure, it is possible to estimate both when the fluid 12 flows in the oil supply pipe 10 or when it does not flow. Since the estimation of the leakage position by the above method uses the characteristic of the pressure change in the oil pipeline, it is possible to estimate only when the fluid 12 flows in the oil pipeline 10.

Next, a basic principle of estimating a leak location through pressures measured at four points in the leak location estimator 30 will be described with reference to FIG. 2. 2 is a view for explaining the principle of the leak location estimation method according to an embodiment of the present invention.

As shown in Figure 2, the pressure in the oil pipe 10 can be displayed in coordinates according to the position. In other words, the position of the oil pipe is indicated on the x-axis, and the coordinates indicating the pressure are made on the y-axis. The position of the x-axis is represented by the length from the oil feed point S to the arrival point D, and the pressure is represented by the pressure P in the oil feed pipe 10 at the corresponding position. In this position-pressure coordinate, in a steady state in which leakage does not occur, the pressure is drawn in a straight line shape such that the pressure is lowered by a constant slope as the position is farther from the oil feed point S, as in L ₀ . In order to oil the fluid 12 such as oil through the oil pipe 10, it is pressurized at the oil feed point S. This is because the fluid flows to the point of entry (D) only when pressurized. The pressurized fluid 12 flows through the oil supply pipe 10 and the pressure P decreases at a constant rate. Therefore, the steady state becomes a straight line like L ₀ .

If leakage occurs at point C, a portion of the fluid 12 sent from the oil delivery point S to the arrival point D flows to C. Therefore, the pressure at position C drops more rapidly to P _C than at steady state. The oil spill point S also drops from P _S ⁰ to P _{S due} to the leakage, but the oil leak point C falls even further. On the other hand, arrival point D also drops from ⁰ to P _D P _D. By the way, in the oil pipe 10, since a pressure falls uniformly according to a position, a pressure falls uniformly between oil feed point S and the oil leak point C. Therefore, a straight line such as L _S of FIG. 2 is drawn. Similarly, since the pressure drops uniformly between the leakage point C and the arrival point D, a straight line such as L _D of FIG. 2 is drawn.

At this point, it can be expected that the pressure at any one point A between the oil feed point S and the oil leak point C will be on a straight line L _S. Likewise, it can be expected that the pressure at any one point B between the leak point C and the arrival point D will be on a straight line L _D. Conversely, if the pressures P _A and P _B at points _A and _B are known, the straight lines L _S and L _D can be plotted on the coordinates. The intersection of these two straight lines must coincide with the leak point C. Therefore, if the pressure P _A and P _B of the _A and B points can be measured without knowing the leak location, the leak location C can be found by finding the two straight lines L _S and L _D and finding the intersection point. On the other hand, as shown in Figure 2, the oil leakage position C can be estimated only if it is between the A and B points.

Next, a process of deriving a formula for obtaining an oil leakage position C using the position-pressure coordinates of FIG. 2 will be described. First, the calculation formula of the straight line L _S is as follows.

However, P _S , P _A and P _C are the pressures at S, A and C points, and X _S , X _A and X _C are the positions at the S, A and C points, respectively.

In addition, when the formula shown in the straight line L _D as follows.

However, P _D , P _B and P _C are the pressures at the points D, B and C, respectively, and X _D , X _B and X _C are the positions of the D, B and C points, respectively.

When the above two equations are combined, the equation for X _C is solved as follows.

This may be expressed as shown in [Equation 1].

Next, a method of estimating an oil leakage position through four pressure points according to an embodiment of the present invention will be described with reference to FIG. 3. 3 is a flowchart illustrating a method of estimating a leak location through the measurement pressures of the four points. As described above, the method of estimating a leak location using the measured pressures at four points includes the pressure information from a pressure gauge installed at an oil supply point S, an arrival point D, an A point close to the oil supply point, and a B point close to the arrival point. It is a way to find the location of leakage when input is leaked. The principles and specific methods were discussed in detail above, so let's take a quick look at the procedure.

As shown in Figure 3, according to an embodiment of the present invention the method of estimating the leakage position through the measured pressure of the four points (a) when the leakage between the point A and B in the oil pipe, installed at the four points Receiving a pressure measurement from a pressure gauge (S11); (b) finding a position where a straight line connecting the pressure at the point S and a pressure at the point A and a straight line connecting the pressure at the point D and the pressure at the point B meet with the position and the pressure as coordinates (S12); (c) estimating the meeting position as a leakage position (S13). In particular, the position X _C where the straight line meets in step (b) is calculated by Equation 1 above.

Next, the principle of the leak location estimation method according to another embodiment of the present invention will be described with reference to FIG. Figure 4a is a diagram illustrating the actual head value and the head transition line for the oil pipe position, Figure 4b is a view illustrating the principle of the leak position estimation method using the position and the head head coordinates of the oil pipe.

The pressure of the oil supply pipe 10 through which fluid such as oil flows may have a different value even if the fluid 12 has the same mass according to an environment such as temperature. Therefore, it is more accurate and useful to express it as a head representing the energy of the fluid than the pressure P of the fluid 12. In particular, the pressure also changes according to environmental characteristics, such as the characteristics of the piping of the oil pipe 10, or the installation position and operating environment of the pressure sensor. Therefore, in order to calculate the head of the fluid 12 more accurately from the measured pressure, the intrinsic elevation value for each position is obtained in advance and used. The unique position is obtained in advance, stored in the database 40, used for reference.

In consideration of the inherent position, the equation for obtaining the head from the pressure or the pressure using the head is shown in [Equation 2].

Where H _k , P _k , and E _k are the head, pressure, and inherent position at _k , respectively, a is a constant, and ρ is the fluid density.

In other words, the first equation in [Equation 2] is to calculate the head from the pressure, and the second equation is rearranged using the pressure as the dependent variable in the first equation. On the other hand, k refers to a point in the oil pipe, so that the four points S, D, A, B point according to the present invention is a point that can be k value soon. a is a constant value for fitting units such as density and pressure. If the unit of position is km, the unit of pressure P is kg / m ² , the unit of head H is m, and ρ kg / m ³ , a has a value of 10.

The head H obtained by Equation 2 from the pressure P measured in a steady state where no leakage occurs is the curve H ⁰ shown in FIG. 4A. (Hereinafter, the pressure measured at the steady state is simply called the normal pressure and the head calculated at the steady state as the normal head.) Meanwhile, the head at S point (H _S ⁰ ) and the head at D point (H _D The trend line of the head which connected ⁰ ) with a straight line is the straight line L _H ^{0 in} FIG. 4A. When the straight line L _H ⁰ is expressed by an equation, Equation 3 is obtained.

However, H _S ⁰ and H _D ⁰ are the heads (or normal heads) at steady state of points S and D, and X _S and X _D are positions at points S and D, respectively.

In the first embodiment, as in the case where the leakage position is determined by the position and the pressure coordinates, the straight line of the pressure drop is used, and in the future, when the leakage position is determined by the position and the head coordinates, the straight line of the head decrease will be used. However, the head H obtained by the actual pressure is not a straight line as shown by the curve H ⁰ of FIG. 4A. Therefore, it should be corrected to meet the straight line. To do this, the pressure correction ΔP _k (k is A and B) for the measured values should be obtained. The pressure correction value ΔP _k is calculated as shown in Equation 4 below.

Where P _k ⁰ is the pressure at point k in the steady state.

a and ρ are the constants and fluid densities described above.

Next, a method of estimating the leakage location in the case where leakage occurs between the A point and the B point will be described in detail. As shown in [Equation 2], the head (H) is proportional to the pressure (P). Therefore, as shown in FIG. 4B, when leakage occurs, the graph by the position (X) -head (H) coordinate is almost the same as the graph of the position (X) -pressure (H) coordinate of FIG. 2. And the method of finding the leak location (X _C ) is the same. However, head (H) should be corrected when calculating head (H) from the measured pressure (P). That is, the pressure must be corrected by applying the pressure correction value? P _k obtained above. The head H is calculated using the corrected pressure, and the leak location is found in the same form as the leak location by the pressure using the head H of four points.

The pressure P _k measured by the leakage is corrected by Equation 5.

Where P _k , P _k 'and ΔP _k are the pressure measurement at point k, the corrected pressure and the pressure correction value.

k is A or B point.

At this time, the correction is performed only for the pressures at the A and B points, and the pressure at the oil feed point S and the arrival point D is not corrected, and the measured value is used as it is. The reason for this is that the straight line of the head has been obtained from the pressure at the oil feed point S and the arrival point D, and thus it is not necessary to correct it.

The calculated by the corrected pressure obtained by Equation 4] P _k 'the water head (H _k) [Equation 2]. That is, in the above process, the head at each point S, D, A, B in the case of leakage can be obtained as H _S , H _D , H _A , H _B.

Using the heads of the four points, the oil leakage position (X _C ) is obtained in the same manner as the method using the pressure. That is, the equation to find is shown in Equation 6 below.

H _S , H _D , H _A , H _B are the leakage heads at points S, D, A, and B, respectively,

X _S , X _D , X _A and X _B are positions at points S, D, A and B, respectively.

Next, a method of estimating a leak location through measuring pressures of four points according to another embodiment of the present invention will be described with reference to FIGS. 5 and 6. FIG. 5 is a flowchart illustrating a method of estimating a leak location through measurement pressures of four points according to another embodiment, and FIG. 6 is a flowchart illustrating a method of obtaining a pressure correction value according to the estimation method. As described above, another embodiment also receives a pressure information from the pressure gauge installed at the oil supply point S, the arrival point D, the A point close to the oil supply point, the B point close to the arrival point of the oil pipe and find the location of the oil leakage when leaking to be. The principles and specific methods were discussed in detail above, so let's take a quick look at the procedure.

As shown in FIG. 5, the method of estimating a leak location of an oil pipe includes: (a) obtaining pressure correction values for points A and B in the oil pipe (S21); (b) receiving leakage oil pressure measurement values from pressure gauges installed at the four points when leakage occurs between points A and B in the oil pipe (S22); (c) for each of the four points, correcting the leak pressure using the pressure correction value from the leak pressure measurement, and calculating the leak head from the corrected leak pressure (S23); (d) finding a position where a straight line connecting the leaky head of the S point and the leaky head of the A point and a straight line connecting the leaky head of the D point and the leaked head of the B point, using the position and the head as coordinates (S24) ; (e) estimating the meeting position as an oil leakage position (S25).

In particular, the step (a) of obtaining the pressure correction value, as shown in Figure 6, (a1) receiving a normal pressure measurement value from the pressure gauge installed at the four points in the normal state (S31); (a2) for each of the four points, calculating a normal head from the normal pressure measurement (S32); (a3) calculating a straight line of the head connecting the normal head of the S point and the D point using the position and the head as coordinates (S33); (a4) for each point A and B, calculating the pressure of the corresponding point by the head on the straight line and calculating the pressure correction value by dividing the difference between the obtained pressure and the normal pressure measurement by the normal pressure measurement ( S34);

On the other hand, the relationship between pressure and head is used in the above formula (2).

In the step (a3), the straight line of the head is obtained by Equation 3, and in the step (a4), the pressure correction value ΔP _k is obtained by the Equation 4.

In the step (d), the corrected leak pressure is the same as the leak pressure measurement value for the point S and the point D, and the corrected leak pressure for the points A and B is expressed by Equation 5 below. Obtain

The position where the straight line meets in step (d) is calculated by Equation 6.

Next, a specific example of a method of estimating a leak location through measuring pressures of four points according to another embodiment of the present invention will be described with reference to FIG. 7. Figure 7a is a view showing the position of the pressure gauge installed in the oil pipe in a specific example, Figure 7b is a diagram illustrating a result table obtained step by step by the method of estimating the leakage position through the measured pressure of four points.

As shown in FIG. 7A, a specific example of a method for estimating a leak location of an oil pipeline according to another embodiment of the present invention is when leakage occurs at a point C between a point A and a point B in a pipe having a total length of 226.1 km. Assume In addition, it is assumed that the fluid density p in the pipe is 0.7914 as an average value. In addition, the oil supply point (S), the arrival point (D), the position (X) for the intermediate point A and B, the unique position (E), the pressure (P ⁰ ) at the normal oil supply, the pressure (P) at the oil leakage Assume that is as shown in Figure 7b. The unit of position is m and the unit of pressure is kg / cm ² . For reference, it should be noted that the area unit of the pressure unit of FIG. 7A is cm ² .

First, the pressure (P ⁰⁾ in the normal oil feed, taking into account the specific position (E) and the fluid density is calculated for the top head (H ^0). At this time, the equation used is [Equation 2].

Next, using the normal head (H ⁰ ) of the oil feed point (S) and the arrival point (D) to obtain a straight line through [Equation 3]. the results are as follow.

H ⁰ fix =-0.0023 X _k + 691.61

The trend head H 'is obtained using the straight line trend line.

Substituting [Equation 4] using the transition head H ', the pressure correction values ΔP of points A and B are obtained. The results are -4.806 kg / cm ² and 0.781 kg / cm ^2, respectively.

The pressure correction value ΔP is substituted into Equation 5 to correct the pressure at the time of leakage. In other words, the pressure at the leakage for points A and B is converted into a corrected pressure. Calculate the leakage head (H) using the corrected pressure [Equation 2]. The result is as shown in Figure 7b.

Substituting the leakage head H in [Equation 6], the leakage position X _C can be finally obtained. The estimated oil leakage position is 87,652m from the oil feed point S.

The above example is an example of an actual situation. That is, the oil feeding point S and the arrival point D are sections between Jeonju and Pangyo, respectively, and the middle points A and B are Gongju and Cheonan. The estimated leak location was 87,652m, while the actual leak location was 86,800m. Therefore, the deviation between the calculated leak position and the actual leak position is 852m. In other words, the calculation error is 0.98%. Since the error range is very small, it can be seen that the leak location estimation method according to the present invention is very accurate.

Next, an apparatus for estimating a leak position through measurement pressures at four points according to an embodiment of the present invention will be described with reference to FIG. 8. 8 is a block diagram of the configuration of the oil leak position estimating apparatus of the oil pipe.

The oil leakage position estimating apparatus 30 of an oil pipeline according to an embodiment of the present invention receives pressure information from a pressure gauge installed at an oil delivery point S, an arrival point D, an A point close to the oil delivery point, and a B point close to the arrival point. It is a device that finds the location of leakage when input is leaked. As described above, the oil leakage position estimating apparatus 30 of the oil pipeline may also be divided into a method of finding an oil leakage position through a position-pressure coordinate and a method of finding an oil leakage position by using a position-head coordinate.

First, for the former method through the position-pressure coordinates, as shown in FIG. 8, the oil leakage position estimating apparatus 30 of the oil pipe includes a pressure information input unit 31, an oil leakage position calculation unit 35, an oil leakage position estimation unit. It consists of 36.

The pressure information input unit 31 receives a pressure measurement from a pressure gauge installed at the four points when leakage occurs between the A and B points in the oil pipe.

The oil leakage position calculation unit 35 finds a position where a straight line connecting the pressure at the S point and a pressure at the A point and a straight line connecting the pressure at the D point and the pressure at the B point meet with the position and the pressure as coordinates.

The oil leakage position estimator 36 receives leakage oil pressure measurement values of the four points through the pressure information input unit when the oil leakage occurs between the A and B points in the oil pipe, and leaks the meeting position calculated through the oil leakage position calculation unit. Estimate by location.

In particular, the leak location estimating unit 36 calculates the position where the straight line meets by the equation (7).

Next, for the former method through the position-head coordinates, as shown in FIG. 8, the leak position estimating apparatus 30 of the oil pipeline includes a pressure information input unit 31, a correction value calculation unit 32, and a pressure head calculation unit. (33), the oil leakage pressure correcting portion 34, the oil leakage position calculating portion 35, and the oil leakage position estimating portion 36.

The correction value calculator 32 calculates pressure correction values for the A and B points in the oil pipe. In particular, the correction value calculation unit 32 receives the normal pressure measurement values from the pressure gauges installed at the four points in the normal state, calculates the normal head, and connects the normal head of the S point and the D point using the position and the head as coordinates. The difference between the normal head of one straight line and the point A and the point B is calculated as the head correction value, and for each point A and the point B, the difference between the pressure corresponding to the head correction value and the normal pressure measurement value is divided by the normal pressure measurement value. Calculate the pressure correction value. In other words, the correction value calculation unit 32 obtains the straight line transition line of the head by the equation (3), and obtains the pressure correction value ΔP _k by the equation (4).

The pressure information input unit 31 receives pressure measurement values from the pressure gauges installed at the four points.

The pressure head calculator 33 calculates the head from the pressure or calculates the pressure from the head. In particular, the pressure head calculation unit 33 calculates the head from the given pressure or the pressure from the given head by Equation (2).

The oil leakage pressure correction unit 34 calculates the oil leakage pressure corrected using the pressure correction value from the oil leakage pressure measurement values at the points A and B in the oil pipe. In particular, the leak pressure correcting unit 34 has the corrected leak pressure for the points S and D, and the corrected leak pressure is the same as the measured leak pressure, and the corrected leak pressure for the points A and B is expressed by Equation 5 below. Obtain

The oil leakage position calculation unit 35 uses the position and the head as coordinates to determine a position where a straight line connecting the oil leakage head of the S point and the oil leakage head of the A point and a line connecting the oil leakage head of the D point and the oil leakage head of the B point meet. Find. In particular, the oil leakage position calculation unit 35 calculates the position where the straight line meets by the equation (6).

The leakage position estimating unit 36 receives leakage pressure measurement values of the four points through the pressure information input unit when leakage occurs between the A and B points in the oil pipe, and corrects the leakage pressure through the leakage pressure correcting unit. Calculate and estimate the encounter location calculated by the leak location calculation unit as the leak location.

Since the leak location estimation apparatus 30 through four measurement pressures is performed similarly to the leak location estimation method through the four pressure points described above, the above-mentioned shortfalls in the above-described description of the present invention Reference is made to the method for estimating the leakage location of an oil pipeline according to the present invention.

As mentioned above, although the invention made by this inventor was demonstrated concretely according to the said Example, this invention is not limited to the said Example and can be variously changed in the range which does not deviate from the summary.

The present invention can be applied to the field of leak detection system (LDS) that can detect leakage or oiling of oil pipe in real time and determine its location to take immediate action when leakage or oiling occurs. . In particular, the present invention is applicable to an apparatus and a method for detecting a location by detecting leaked oil or oil generated while a fluid such as petroleum or oil flows in an oil pipe.

1 is a diagram illustrating an overall leak detection and leak location estimation system for implementing the present invention.

2 is a view for explaining the principle of the leak location estimation method according to an embodiment of the present invention.

3 is a flowchart illustrating a method of estimating a leak location through measurement pressures at four points according to an embodiment of the present invention.

4 is a view for explaining the principle of the leak location estimation method according to another embodiment of the present invention.

5 is a flowchart illustrating a method of estimating an oil leakage position using measured pressures at four points according to another exemplary embodiment of the present invention.

6 is a flowchart illustrating a method of obtaining a pressure correction value according to another embodiment of the present invention.

FIG. 7 is a diagram illustrating a specific example of a method for estimating an oil leakage position using measured pressures at four points according to another exemplary embodiment of the present invention.

8 is a block diagram of a configuration of an apparatus for estimating an oil leakage position using measured pressures at four points according to an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

10: Oil Pipeline 11: Oiled Out Branch

12 fluid 13, 14 reservoir or pressurized station

20, 21, 22, 23, 24: pressure gauge 30: oil leakage position estimation device

31: pressure information input unit 32: correction value calculation unit

33: pressure head calculation unit 34: leakage oil pressure correction unit

35: leak location calculation unit 36: leak location estimation unit

40: database

Claims (17)

delete Oil leakage through the measured pressure of 4 points to find the oil leakage position by receiving pressure information from the pressure gauge installed at oil supply point S, arrival point D, oil point A, and point B close to the oil point. In the position estimation method, (a) receiving a pressure measurement from a pressure gauge installed at the four points when leakage occurs between points A and B in the oil pipe; (b) finding a position where a straight line connecting the pressure at the point S and a pressure at the point A and a straight line connecting the pressure at the point D and the pressure at the point B meet with the position and the pressure as coordinates; (c) estimating the meeting position as a leak location; Including; The position X _C where the straight line meets in step (b) is calculated by Equation 1; [Equation 1]

P _S , P _D , P _A and P _B are the pressures at points S, D, A and B, respectively X _S , X _D , X _A and X _B are positions at points S, D, A and B, respectively Oil leakage through the measured pressure of 4 points to find the oil leakage position by receiving pressure information from the pressure gauge installed at oil supply point S, arrival point D, oil point A, and point B close to the oil point. In the position estimation method, (a) obtaining pressure correction values for points A and B in the pipeline; (b) receiving leakage pressure measurement values from pressure gauges installed at the four points when leakage occurs between the A and B points in the oil pipe; (c) for each of the four points, correcting the leak pressure using the pressure correction value from the leak pressure measurement value, and calculating the leak head from the corrected leak pressure; (d) finding a position where a straight line connecting the leakage head of the S point and the leakage head of the A point and a straight line connecting the leakage head of the D point and the leakage head of the B point meet with the position and the head as coordinates; (e) estimating the meeting position as a leak location; Leakage position estimation method through the measured pressure of the four points comprising a. The method of claim 3, wherein step (a) comprises: (a1) receiving a steady pressure measurement from a pressure gauge installed at the four points in a steady state; (a2) for each of the four points, calculating the normal head from the normal pressure measurement; (a3) calculating a straight line of the head connecting the normal head of the S point and the D point using the position and the head as coordinates; (a4) for each point A and B, calculating the pressure of the corresponding point by the head on the straight line, and calculating a pressure correction value by dividing the difference between the obtained pressure and the normal pressure measurement by the normal pressure measurement; Leakage position estimation method through the measured pressure of the four points comprising a. The method according to claim 3 or 4, The relationship between the pressure and the head is the method of estimating the leakage position through the measured pressure of four points, characterized by using the equation (2). [Formula 2]

Where H _k , P _k , and E _k are the head, pressure, and inherent position at point _k , respectively, a is a constant, ρ is the fluid density. k is S, D, A, B point. The method of claim 5, wherein In the step (a3), a straight line transition line of the head is obtained by Equation 3, [Equation 3]

Where H _S ⁰ , H _D ⁰ is the head at steady state at points S and D, X _S , X _D , and X _k are the positions at points S, D, and k, respectively k is A or B point, Step (a4) is a method for estimating the leakage position through the measured pressure of the four points, characterized in that to obtain the pressure correction value ΔP _k by [Equation 4]. [Equation 4]

Where P _k ⁰ is the pressure at point k at steady state. a is a constant, ρ is the fluid density. The method of claim 6, wherein step (d) For points S and D, the corrected leak pressure is equal to the leak pressure measurement, A method for estimating a leak location through the measured pressures of four points, wherein the corrected leak pressure is calculated with respect to the points A and B using Equation 5. [Equation 5]

Where P _k , P _k 'and ΔP _k are the pressure measurement at point k, the corrected pressure and the pressure correction value. k is A or B point. The method of claim 7, wherein The location where the straight line meets in step (d) is calculated by [Equation 6] characterized in that the leakage position estimation method through the measured pressure of the four points. [Equation 6]

H _S , H _D , H _A , H _B are the leakage heads at points S, D, A, and B, respectively, X _S , X _D , X _A and X _B are positions at points S, D, A and B, respectively. delete Oil leakage through the measured pressure of 4 points to find the oil leakage position by receiving pressure information from the pressure gauge installed at oil supply point S, arrival point D, oil point A, and point B close to the oil point. In the position estimation device, A pressure information input unit for receiving pressure measurement values from pressure gauges installed at the four points when leakage occurs between the A and B points in the oil pipe; An oil leak position calculation unit for finding a position where a straight line connecting the pressure at the point S and a pressure at the point A and a straight line connecting the pressure at the point D and the pressure at the point B meets the position and the pressure as coordinates; When leakage occurs between the A and B points in the oil pipe, the oil leakage position estimating unit receives the oil leakage pressure measurement values of the four points through the pressure information input unit, and estimates the meeting position calculated by the oil leakage position calculation unit as the oil leakage position. ; Including; The oil leakage position estimating unit calculates a position where a straight line meets according to [Equation 7]. [Formula 7]

P _S , P _D , P _A and P _B are the pressures at points S, D, A and B, respectively X _S , X _D , X _A and X _B are positions at points S, D, A and B, respectively Oil leakage through the measured pressure of 4 points to find the oil leakage position by receiving pressure information from the pressure gauge installed at oil supply point S, arrival point D, oil point A, and point B close to the oil point. In the position estimation device, A correction value calculating unit for calculating pressure correction values for points A and B in the oil pipe; A pressure information input unit for receiving a pressure measurement from the pressure gauge installed at the four points; A pressure head calculator for calculating head from pressure or calculating pressure from head; A leakage oil pressure correcting unit for finding points A and B in the oil pipe, the leakage oil pressure corrected using the pressure correction value from the leakage oil pressure measurement value; An oil leak position calculation unit for finding a position where a straight line connecting the leaky head of S point and the leaky head of A point and a straight line connecting the leaky head of D point and the leaky head of B point meet; When leakage occurs between the points A and B in the oil pipe, the leakage pressure measurement values of the four points are input through the pressure information input unit, and the head is obtained by correcting the leakage pressure through the leakage pressure correction unit. An oil leakage position estimating unit for estimating the calculated meeting position as an oil leakage position; Leakage detection device through the flowmeter error correction, characterized in that it comprises a. The method of claim 11, wherein the correction value calculation unit, In the steady state, the normal head is calculated from the pressure gauge installed at the four points, and the normal head is calculated. Calculate the difference between the straight line connecting the normal head of the S point and the D point and the normal head of the A point and the B point as the head correction value using the position and the head as the coordinates, For each of points A and B, the oil leakage position estimation using the measured pressure at four points is calculated by dividing the difference between the pressure corresponding to the head correction value and the normal pressure measurement value by the normal pressure measurement value as the pressure correction value. Device. The pressure head calculation unit according to claim 11 or 12, wherein An apparatus for estimating a leak location through four pressure points, wherein the head is calculated from a given pressure, or the pressure is calculated from a given head by Equation 8. Equation 8

Where H _k , P _k , and E _k are the head, pressure, and inherent position at point _k , respectively, a is a constant, ρ is the fluid density. k is S, D, A, B point. The method of claim 13, The correction value calculating section calculates the linear trend line of the head by using Equation 9, [Equation 9]

Where H _S ⁰ , H _D ⁰ is the head at steady state at points S and D, X _S , X _D , and X _k are the positions at points S, D, and k, respectively k is A or B point, An oil leakage position estimating apparatus using four pressure points, wherein the pressure correction value? P _k is obtained by Equation (10). Equation 10

Where P _k ⁰ is the pressure at point k at steady state. a is a constant, ρ is the fluid density. 15. The method of claim 14, wherein the oil leakage pressure correction unit, For points S and D, the corrected leak pressure is equal to the leak pressure measurement, An apparatus for estimating a leak location through the measured pressures of four points, wherein the corrected leak pressure is obtained by using Equation 11 for the points A and B. [Equation 11]

Where P _k , P _k 'and ΔP _k are the pressure measurement at point k, the corrected pressure and the pressure correction value. k is A or B point. The method of claim 15, wherein the leak location calculation unit, An oil leakage position estimating device using four pressure points, characterized in that the position where a straight line meets is calculated by [Equation 12]. Equation 12

H _S , H _D , H _A , H _B are the leakage heads at points S, D, A, and B, respectively, X _S , X _D , X _A and X _B are positions at points S, D, A and B, respectively. A computer-readable recording medium recording a method of estimating a leak location using the measured pressures of four points of claim 2.

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