CN113847553B - Underground oil pipeline leakage monitoring system and method - Google Patents
Underground oil pipeline leakage monitoring system and method Download PDFInfo
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- CN113847553B CN113847553B CN202111024286.3A CN202111024286A CN113847553B CN 113847553 B CN113847553 B CN 113847553B CN 202111024286 A CN202111024286 A CN 202111024286A CN 113847553 B CN113847553 B CN 113847553B
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- 238000007689 inspection Methods 0.000 claims abstract description 94
- 238000004868 gas analysis Methods 0.000 claims abstract description 35
- 239000007789 gas Substances 0.000 claims abstract description 26
- 239000002689 soil Substances 0.000 claims abstract description 10
- 238000001514 detection method Methods 0.000 claims description 15
- 230000008859 change Effects 0.000 claims description 11
- 238000005086 pumping Methods 0.000 claims description 5
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- 230000000149 penetrating effect Effects 0.000 claims description 3
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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
- F17D5/02—Preventing, monitoring, or locating loss
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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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Abstract
The invention provides a buried oil pipeline leakage monitoring system, which comprises a soil gas collecting pipeline laid along an oil pipeline, a soil gas inspection well communicated with the soil gas collecting pipeline and soil gas analysis equipment, wherein the soil gas collecting pipeline is pre-embedded in soil and is positioned around the outside of the oil pipeline; the soil gas analysis equipment is connected with the gas outlet pipe corresponding to the soil gas inspection well according to the working condition requirement. A monitoring method using the system is also disclosed. The soil gas collecting pipeline has simple structure and low cost; the disturbance to the underground oil pipeline is small during installation; the leakage of a section of pipeline can be checked by one-time monitoring; the size and the position of the leakage of the oil pipeline can be analyzed.
Description
Technical Field
The invention discloses a system and a method for monitoring leakage of an underground oil pipeline, belongs to the field of leakage monitoring of oil pipelines, and is particularly suitable for monitoring leakage of a long-distance underground oil pipeline.
Background
Most of long-distance oil pipelines belong to buried facilities and are arranged in a next-wall desert far away from human society, and due to concealment, leakage caused by corrosion and cracking in the early stage of pipeline accidents is not easy to find. Once oil leakage occurs, huge economic loss and environmental pollution can be caused, and if the leakage condition of the pipeline is intensified, great safety risk can be further caused.
At present, a leakage monitoring method for a long-distance underground oil pipeline, particularly a pipeline with a long service life, is a mode of combining an inspection well with manual inspection, namely, the inspection well is arranged at two ends of each pipeline section, and special equipment is arranged in the inspection well to monitor parameters such as flow, flow speed, pressure, temperature and the like of oil products in the pipeline in real time. When a pipe segment is found to be likely to leak, workers are dispatched to perform manual patrols along the pipeline. The leakage monitoring method has the major defects that firstly, the division length of the pipe section of the long-distance oil pipeline is very long, usually tens to hundreds of kilometers, and the distance to be checked after the leakage of the pipe section is found is very long; secondly, when the oil leakage at the leakage point is less, the leakage condition can not be effectively reflected in the monitoring data of the inspection well; thirdly, the manual inspection has high working strength, low inspection efficiency and easy omission inspection. The optical fiber method with high detection rate and high monitoring precision has high equipment and construction cost and is not suitable for leakage monitoring of the built underground oil pipeline.
At present, for oil pipeline leakage, the change characteristics of mechanical waves in a pipe are generally measured, for example, in Chinese patent CN201611161812.X, db 4-10 series wavelet functions are selected as wavelet bases of wavelet transformation, and the number of layers of wavelet decomposition is determined to be 4; performing 4-layer discrete wavelet decomposition on the original sound signal by adopting a MALLAT tower algorithm, and selecting detail signals of a third scale and a fourth scale to perform wavelet reconstruction to obtain a de-noised signal; uniformly dividing the denoising signal according to time to obtain a divided sound signal segment; performing short-time Fourier transform on each segmented sound segment to obtain a transform matrix; making a normalized energy graph of the sound signal by using the transformation matrix; and judging whether the oil pipeline has micro leakage or not according to the normalized energy diagram. However, due to pressure fluctuation in the operation process of the pipeline, a large error exists in analyzing the pipeline leakage by detecting the change of the mechanical wave in the pipeline, and particularly for small-flow leakage or micro leakage, the detection by the change of the mechanical wave in the pipeline is more difficult.
There are also technical schemes for detecting the temperature of soil outside the pipeline and analyzing the pipeline leakage information, for example, majen reports that a mathematical model of Fluid-solid coupling in soil porous media is established by means of cfd (computational Fluid dynamics) software, and simulation analysis is performed on the change of a ground temperature field when hot oil leaked from the upper part of a buried pipeline permeates and diffuses in different soils in winter and summer (majen, wangye, smith, etc.. simulation analysis on the influence of the hot oil leakage on the soil temperature field [ J ] energy saving technology, 2012,30(5):439 (442)). However, for many normal temperature oil pipelines (such as product oil pipelines, light crude oil pipelines, etc.), the oil temperature is substantially consistent with the ambient temperature, and oil leakage is difficult to detect through temperature changes.
Therefore, a new method for monitoring leakage of a long-distance underground oil pipeline is urgently needed, and the technical problems of narrow application range, large error, labor consumption and the like in the prior art are solved.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a system and a method for monitoring leakage of an underground oil pipeline, which can effectively shorten the leakage inspection distance, greatly reduce the manual workload and the working strength and improve the leakage inspection efficiency.
In order to achieve the purpose, the invention is realized by the following technical scheme: a buried oil pipeline leakage monitoring system comprises a soil gas collecting pipeline laid along an oil pipeline, a soil gas inspection well communicated with the soil gas collecting pipeline and soil gas analysis equipment communicated with the soil gas inspection well, wherein the soil gas collecting pipeline is pre-embedded in soil and is positioned around the outside of the oil pipeline, the soil gas collecting pipeline comprises a plurality of pipeline units which are sequentially arranged, part of or each pipeline unit is provided with at least one sieve tube part, and a plurality of vent holes penetrating through the side wall of the sieve tube part are distributed on the side wall of the sieve tube part;
through soil gas inspection shaft intercommunication between adjacent pipeline unit, the bottom of soil gas inspection shaft the breather pipe that has two intercommunication soil gas inspection shaft inner chambers, two breather pipes are connected with the pipeline unit of soil gas inspection shaft both sides respectively, and all are provided with a control valve on every breather pipe. Specifically, one of the two breather pipes is connected with a pipeline unit at one side of the soil gas inspection well, and the other breather pipe is connected with a pipeline unit at the other side of the soil gas inspection well.
The control valve on the vent pipe of the soil gas inspection well can be opened and closed to control whether the gas in the soil gas collecting pipeline enters the soil gas inspection well or not and to control which pipeline unit the gas in can enter the soil inspection well.
And the top of each soil gas inspection well is provided with an air outlet pipe communicated with the inner cavity of the inspection well, and the soil gas analysis equipment is connected with the corresponding air outlet pipe according to the requirement of monitoring working conditions. The soil gas analysis equipment has the function of air exhaust and can detect and analyze volatile components in oil products. And when the normally closed valve is opened, the soil gas analysis equipment pumps out soil gas near the oil pipeline through the soil gas inspection well and the soil gas collection pipeline in sequence and analyzes the soil gas. Preferably, the soil gas analysis equipment can be matched with an air exhaust hose, the air exhaust hose has good sealing performance and does not generate chemical reaction or physical adsorption with oil products, and an air exhaust pipe of the soil gas analysis equipment is connected with an air outlet pipe through the air exhaust hose.
And further, the leakage amount and the leakage position of the underground oil pipeline are judged by monitoring the components of soil gas around the oil pipeline.
Optionally, the soil gas collecting pipeline may be made of UPVC, carbon steel, stainless steel or other materials.
Preferably, the soil gas collecting pipeline is arranged in parallel with the oil pipeline, and the buried depth of the soil gas collecting pipeline is slightly lower than or equal to that of the oil pipeline.
Preferably, the sieve tube portion is arranged at a position where oil pipelines are easy to leak, namely, a connecting line of the sieve tube portion and the position where the oil pipelines are easy to leak is perpendicular to the soil gas collecting pipeline. The screen pipe part is used for the entering of soil gas, and then preferably, the setting position and the quantity of the screen pipe part should correspond to the position and the quantity of the easy-to-leak position one by one.
Preferably, the soil gas analysis equipment is portable soil gas analysis equipment.
The length of the pipeline unit can be selected according to the working condition, and is not limited, for example, the design is carried out according to the number and the positions of leakage monitoring points of the oil pipeline, and the balance is obtained between the detectable rate and the monitoring accuracy; the distance between the soil gas collecting pipeline and the oil pipeline can also be selected according to the working condition and the detection effect, and the method is not limited.
Preferably, the outer ends of the pipeline units positioned at the outermost ends of the two ends of the soil gas collecting pipeline are sealed structures.
The monitoring method of the system for monitoring the leakage of the underground oil pipeline comprises the following steps:
the method comprises the steps of selecting a pipeline unit corresponding to an oil pipeline to be tested as a pipeline unit to be tested, switching on and off a control valve on a vent pipe of a soil gas inspection well connected with the pipeline unit to be tested to enable the pipeline unit to be tested to be communicated with only one soil gas inspection well, connecting soil gas analysis equipment with a vent pipe of the soil gas inspection well communicated with the pipeline unit to be tested, exhausting air by the soil gas analysis equipment and analyzing gas components, and analyzing and determining the leakage position and the leakage condition of the oil pipeline according to the change condition of the components of the exhausted air.
Further, according to the change situation of the gas composition of the bleed air, the leakage position and the leakage situation of the oil pipeline are analyzed and determined, including:
analyzing and determining the leakage condition of the oil pipeline: the leakage degree is in positive correlation with the concentration of oil gas components, and the more serious the pipeline leakage is, the higher the concentration of the oil gas components in the extracted gas is;
analyzing and determining the leakage position of the oil pipeline: the method is obtained by analyzing the relation between the soil gas detection signal and the detection signal time, and the calculation formula of the leakage position of the oil pipeline is as follows:
wherein,
s is the distance from the soil gas inspection well to the leakage point, and the unit is m;
q, the pumping speed of the portable soil gas analysis equipment, and the unit is m 3 /s；
d, the inner diameter of the soil gas collecting pipeline is m;
t is the time for detecting the oil gas component and has the unit of s;
h is the distance from the soil gas inspection well mouth to the soil gas collection pipeline, and the unit is m;
s 0 the length of the hose from the soil gas inspection well mouth to the portable soil gas analysis equipment is m.
The following illustrates how to open and close the control valve on the air pipe of the soil gas inspection well connected with the pipeline unit to be tested, so that the pipeline unit to be tested is only communicated with one soil gas inspection well. The left end and the right end of the pipeline unit to be detected are connected with the soil gas inspection wells, and the soil gas inspection wells are the left soil gas inspection well and the right soil gas inspection well respectively, at the moment, the control valve on the vent pipe of the pipeline unit to be detected is connected with the left soil gas inspection well, the control valve on the vent pipe of the pipeline unit to be detected is connected with the right soil gas inspection well, the control valve on the other vent pipe of the right soil gas inspection well is closed, namely the control valve on the vent pipe of the pipeline unit to be detected is not connected with the left soil gas inspection well, and therefore the operation that the pipeline unit to be detected is only communicated with the right soil gas inspection well is achieved. When the pipeline unit to be detected is the pipeline unit which is positioned at the outermost end of the left end of the soil gas collecting pipeline, the outer end (namely the left end) of the pipeline unit to be detected is of a sealing structure, so that the control valve on the vent pipe of the pipeline unit to be detected connected with the right side soil gas inspection well is only required to be opened, and the control valve on the other vent pipe of the right side soil gas inspection well is closed, so that the operation that the pipeline unit to be detected is only communicated with the right side soil gas inspection well is realized. The left and right in the above examples are for illustration only and may be reversed.
The invention has the beneficial effects that:
the soil gas collecting pipeline has simple structure and low cost; the soil gas collecting pipeline is arranged at a certain distance beside the underground oil pipeline, and the disturbance to the underground oil pipeline is small during installation; the soil gas one-time detection result is an integral result of leakage monitoring of an oil pipeline with a certain length, and can comprise a plurality of leakage monitoring points, leakage of one section of pipeline can be checked through one-time monitoring, and the working strength of workers is reduced. The soil gas detection result can be used for analyzing the scale and the position of the leakage of the oil pipeline.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a schematic diagram of an underground oil pipeline leakage monitoring system according to the present invention;
FIG. 2 is a schematic view of the connection structure of the soil gas collecting pipeline, the soil gas inspection well and the soil gas analyzing equipment of the present invention.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, which are set forth for a purpose of providing a thorough understanding of the present disclosure.
It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. As used herein, the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for the purpose of convenience and simplicity of description, and are not intended to indicate or imply that the referenced devices or components must be in a particular orientation, constructed and operated in a particular orientation, and are not to be construed as limiting the present invention, which is for purposes of illustration only and is not intended to be in the sole embodiment.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Referring to fig. 1-2, the present invention provides a technical solution: a buried oil pipeline leakage monitoring system comprises a soil gas collecting pipeline 2 laid along an oil pipeline 1, a soil gas inspection well 3 communicated with the soil gas collecting pipeline 2 and soil gas analysis equipment 4 communicated with the soil gas inspection well 3, wherein the soil gas collecting pipeline 2 is pre-embedded in soil and is positioned around the outside of the oil pipeline 1, the soil gas collecting pipeline 2 comprises a plurality of pipeline units 5 which are sequentially arranged, part of the pipeline units 5 or each pipeline unit 5 is provided with at least one sieve pipe part 6, the side wall of the sieve pipe part 6 is provided with a plurality of vent holes penetrating through the side wall of the sieve pipe part 6, and in the specific implementation process, the shapes and the sizes of the vent holes can be executed according to the relevant national standards and regulations;
through the 3 intercommunications of soil gas inspection shaft between adjacent pipe unit 5, the bottom of soil gas inspection shaft 3 the breather pipe of 3 inner chambers of two intercommunication soil gas inspection shafts has, two breather pipes are connected with the pipe unit 5 of 3 both sides of soil gas inspection shaft respectively, and all are provided with a control valve 7 on every breather pipe. Specifically, one of the two air pipes is connected with the pipeline unit 5 on one side of the soil gas inspection well 3, and the other air pipe is connected with the pipeline unit 5 on the other side of the soil gas inspection well 3.
Whether the gas in the soil gas collecting pipeline 2 enters the soil gas inspection well 3 or not can be controlled by opening and closing the control valve 7 on the vent pipe of the soil gas inspection well 3, and which pipeline unit 5 can enter the soil inspection well can be controlled.
The top of each soil gas inspection well 3 is provided with an air outlet pipe communicated with the inner cavity of the inspection well, and the soil gas analysis equipment 4 is connected with the corresponding air outlet pipe according to the working condition requirement. The soil gas analysis equipment 4 has an air pumping function and can detect and analyze volatile components in oil products. And when the normally closed valve is opened, the soil gas analysis equipment 4 pumps out soil gas near the oil pipeline 1 through the soil gas inspection well 3 and the soil gas collection pipeline 2 in sequence and analyzes the soil gas. Preferably, the soil gas analysis equipment 4 can be matched with an air exhaust hose, the air exhaust hose has good sealing performance and does not generate chemical reaction or physical adsorption with oil products, and an air exhaust pipe of the soil gas analysis equipment 4 is connected with an air outlet pipe through the air exhaust hose
Optionally, the soil gas collecting pipe 2 may be made of UPVC, carbon steel, stainless steel or other materials.
Preferably, the soil gas collecting pipeline 2 is arranged in parallel with the oil pipeline 1, and the buried depth of the soil gas collecting pipeline 2 is slightly lower than or equal to that of the oil pipeline 1.
Preferably, the screen pipe part 6 is arranged at the easy leakage position of the oil pipeline 1, namely, the connecting line of the screen pipe part 6 and the easy leakage position is vertical to the soil gas collecting pipeline 2. The screen pipe part 6 is used for the entering of soil gas, and further preferably, the setting position and the number of the screen pipe part 6 correspond to the position and the number of the easy-leakage position one by one.
Preferably, the soil gas analysis device 4 is a portable soil gas analysis device 4.
The length of the pipeline unit 5 can be selected according to the working condition, and is not limited to the working condition, for example, the design is carried out according to the number and the positions of leakage monitoring points of the oil pipeline 1, and the balance is obtained between the detection rate and the monitoring accuracy; the distance between the soil gas collecting pipeline 2 and the oil pipeline 1 can also be selected according to the working condition and the detection effect, and the method is not limited to the above.
Preferably, the outer ends of the pipeline units 5 positioned at the outermost ends of the two ends of the soil gas collecting pipeline 2 are sealed structures.
The monitoring method adopting the underground oil pipeline leakage monitoring system comprises the following steps:
the method comprises the steps of selecting a pipeline unit 5 corresponding to an oil pipeline 1 to be detected as the pipeline unit 5 to be detected, switching on and off a control valve 7 on a vent pipe of a soil gas inspection well 3 connected with the pipeline unit 5 to be detected, enabling the pipeline unit 5 to be detected to be communicated with only one soil gas inspection well 3, connecting a soil gas analysis device 4 with a vent pipe of the soil gas inspection well 3 communicated with the pipeline unit 5 to be detected, exhausting air by the soil gas analysis device 4, analyzing gas components, and analyzing and determining the leakage position and the leakage condition of the oil pipeline 1 according to the change condition of the exhausted gas components.
Further, according to the change situation of the gas composition of the extracted gas, the leakage position and the leakage situation of the oil pipeline 1 are analyzed and determined, and the method comprises the following steps:
analysis to determine the leakage of the oil pipeline 1: the leakage degree is in positive correlation with the concentration of oil gas components, and the more serious the pipeline leakage is, the higher the concentration of the oil gas components in the extracted gas is;
the analysis determines the leakage position of the oil pipeline 1: the method is obtained by analyzing the relation between the soil gas detection signal and the detection signal time, and the calculation formula of the leakage position of the oil pipeline 1 is as follows:
wherein,
s is the distance from the soil gas inspection well to the leakage point, and the unit is m;
q, is the pumping rate of the soil gas analysis equipment 4 in m 3 /s；
d is the inner diameter of the soil gas collecting pipeline 2, and the unit is m;
t is the time for detecting the oil gas component and has the unit of s;
h is the distance from the soil gas inspection wellhead to the soil gas collecting pipeline 2, and the unit is m;
s 0 the length of the hose from the soil gas inspection well head to the soil gas analysis equipment 4 is in m.
The following illustrates how to open and close the control valve 7 on the air pipe of the soil gas inspection well 3 connected to the pipe unit 5 to be tested, so that the pipe unit 5 to be tested is communicated with only one soil gas inspection well 3. Connect soil gas inspection shaft 3 with the left and right both ends of the pipeline unit 5 that awaits measuring and be left side soil gas inspection shaft and right side soil gas inspection shaft respectively, at this moment, close control valve 7 on the breather pipe of left side soil gas inspection shaft connection pipeline unit 5 that awaits measuring, open control valve 7 on the breather pipe of right side soil gas inspection shaft connection pipeline unit 5 that awaits measuring simultaneously, and close control valve 7 on another breather pipe of right side soil gas inspection shaft, control valve 7 on the breather pipe of pipeline unit 5 that awaits measuring is not connected to right side soil gas inspection shaft promptly, just so realized the operation that pipeline unit 5 that awaits measuring only communicates with right side soil gas inspection shaft. When the pipeline unit 5 to be tested is the pipeline unit 5 which is positioned at the outermost end of the left end of the soil gas collecting pipeline 2, the outer end (namely the left end) of the pipeline unit 5 to be tested is of a sealing structure, so that the control valve 7 on the vent pipe of the pipeline unit 5 to be tested which is connected with the right soil gas inspection well is only required to be opened, and the control valve 7 on the other vent pipe of the right soil gas inspection well is closed, so that the operation that the pipeline unit 5 to be tested is only communicated with the right soil gas inspection well is realized. The left and right in the above examples are for example only and are interchangeable.
The soil gas collecting pipeline has simple structure and low cost; the soil gas collecting pipeline is arranged at a certain distance beside the underground oil pipeline, and the disturbance to the underground oil pipeline is small during installation; the soil gas one-time detection result is an integral result of leakage monitoring of an oil pipeline with a certain length, and can comprise a plurality of leakage monitoring points, leakage of one section of pipeline can be checked through one-time monitoring, and the working strength of workers is reduced. The detection result of the soil gas can analyze the scale and the position of the leakage of the oil pipeline 1.
While there have been shown and described what are at present considered the fundamental principles and essential features of the invention and its advantages, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may include only a single embodiment, and such description is for clarity only, and those skilled in the art will be able to make the description as a whole, and the embodiments may be appropriately combined to form other embodiments as will be apparent to those skilled in the art.
Claims (7)
1. A monitoring method of a buried oil pipeline leakage monitoring system is characterized in that: the soil gas analysis device comprises a soil gas collecting pipeline paved along an oil pipeline, a soil gas inspection well communicated with the soil gas collecting pipeline and soil gas analysis equipment communicated with the soil gas inspection well, wherein the soil gas analysis equipment is portable soil gas analysis equipment and has an air pumping function;
the soil gas collecting pipeline is embedded in soil and positioned around the outside of the oil pipeline, the soil gas collecting pipeline comprises a plurality of pipeline units which are arranged in sequence, each pipeline unit is provided with at least one sieve pipe part, and a plurality of vent holes penetrating through the side wall of the sieve pipe part are distributed on the side wall of the sieve pipe part;
the adjacent pipeline units are communicated through a soil gas inspection well, two breather pipes communicated with the inner cavity of the soil gas inspection well are arranged at the bottom of the soil gas inspection well, the two breather pipes are respectively connected with the pipeline units at the two sides of the soil gas inspection well, and each breather pipe is provided with a control valve;
the top of each soil gas inspection well is provided with an air outlet pipe communicated with the inner cavity of the inspection well, and the soil gas analysis equipment is connected with the corresponding air outlet pipe according to monitoring requirements;
selecting a pipeline unit corresponding to an oil pipeline to be tested as a pipeline unit to be tested, switching on and off a control valve on a vent pipe of a soil gas inspection well connected with the pipeline unit to be tested to enable the pipeline unit to be tested to be communicated with only one soil gas inspection well, connecting soil gas analysis equipment with a vent pipe of the soil gas inspection well communicated with the pipeline unit to be tested, exhausting air and analyzing gas components by the soil gas analysis equipment, and analyzing and determining the leakage position and the leakage condition of the oil pipeline according to the change condition of the components of the exhausted air;
according to the change situation of the gas composition of the extracted gas, analyzing and determining the leakage position of the oil pipeline, comprising the following steps:
the method is obtained by analyzing the relation between the soil gas detection signal and the detection signal time, and the calculation formula of the leakage position of the oil pipeline is as follows:
wherein,
s is the distance from the soil gas inspection well to the leakage point, and the unit is m;
q, the pumping speed of the portable soil gas analysis equipment, and the unit is m 3 /s；
d, the inner diameter of the soil gas collecting pipeline is m;
t is the time for detecting the oil gas component and has the unit of s;
h is the distance from the soil gas inspection well mouth to the soil gas collecting pipeline, and the unit is m;
s 0 the length of the hose from the soil gas inspection well mouth to the portable soil gas analysis equipment is m.
2. The monitoring method of the underground oil pipeline leakage monitoring system according to claim 1, characterized in that: the soil gas collecting pipeline is arranged in parallel with the oil pipeline.
3. The monitoring method of the underground oil pipeline leakage monitoring system according to claim 2, characterized in that: the buried depth of the soil gas collecting pipeline is slightly lower than or equal to that of the oil pipeline.
4. The monitoring method of the underground oil pipeline leakage monitoring system according to claim 1, characterized in that: the screen pipe part is arranged at the position where the oil pipeline is easy to leak.
5. The monitoring method of the underground oil pipeline leakage monitoring system according to claim 4, characterized in that: the arrangement positions and the number of the sieve pipe parts correspond to the positions and the number of the easy-leakage positions of the oil pipeline one by one.
6. The monitoring method of the underground oil pipeline leakage monitoring system according to claim 1, characterized in that: the outer ends of the pipeline units positioned at the outermost ends of the two ends of the soil gas collecting pipeline are all sealing structures.
7. The monitoring method of the underground oil pipeline leakage monitoring system according to claim 1, characterized in that: according to the change situation of the components of the extracted gas, analyzing and determining the leakage situation of the oil conveying pipeline, comprising the following steps:
the degree of leakage is in positive correlation with the concentration of oil and gas components, and the more severe the pipeline leakage, the higher the concentration of oil and gas components in the extracted gas.
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