High-consequence area identification method applied to gas field gas production pipeline series connection pipe network

Abstract

The invention belongs to the technical field of pipeline integrity management high-consequence area identification, and particularly provides a high-consequence area identification method applied to a gas field gas production pipeline series connection pipe network, and the method comprises the steps: dividing a gas production pipeline network into a plurality of identification units according to the concentration ratio of pipelines, and dividing each identification unit into a plurality of to-be-identified areas; identifying a high-consequence area pipe section in each to-be-identified area; and high-consequence area identification of the gas production pipe network is completed. The problems that high-consequence area recognition and report making are carried out on dense and large-number gas production pipelines one by one by adopting an existing standard process, and an existing recognition unit division method is large in workload and extremely low in efficiency are solved. Attribute data of the pipelines do not need to be considered, the relatively concentrated pipelines can be divided into one recognition unit only according to the concentration degree of the pipelines, the workload is small, and the efficiency is high.

Description

Technical Field

[0001] This invention belongs to the technical field of high-consequence zone identification in pipeline integrity management, specifically relating to a method for identifying high-consequence zones in gas field gas production pipeline interconnection networks. Background Technology

[0002] With the ever-expanding scale of domestic oil and gas pipelines, serious accidents such as leaks and explosions occur frequently, leading to severe consequences. To ensure pipeline safety management, the national standard GB32167-2015, "Specification for Integrity Management of Oil and Gas Pipelines," has been formulated and issued. This standard specifies the content, methods, and requirements for the integrity management of oil and gas pipelines, including data collection and integration, high-consequence zone identification, risk assessment, integrity assessment, risk mitigation and maintenance, and performance evaluation. Section 6.1.2, "Identification of High-Consequence Zones in Gas Pipelines," specifies the methods for identifying high-consequence zones in gas pipelines. Figure 5 Table 1 shows the criteria for identifying high-consequence areas in gas pipelines.

[0003] Table 1. Criteria for Identifying High-Consequence Zones in Gas Pipelines

[0004]

[0005]

[0006] 1. Regional Classification Standards

[0007] Based on the number of households and / or the density of buildings along the pipeline route, the areas are classified into four levels, as detailed in the relevant regulations:

[0008] 1) Within a 200m radius on either side of the pipeline centerline, arbitrarily divide the area into several sections, each 2km long and encompassing the maximum number of households. These sections are then classified into four levels based on the number of households within each section. In villages, courtyards, and residential buildings with concentrated rural populations, each independent household should be counted as a single building for habitation.

[0009] a. Level 1 areas: Sections with 15 or fewer households;

[0010] b. Secondary areas: Sections with 15 to 100 households;

[0011] c. Level 3 areas: Areas with 100 or more households, including suburban residential areas, commercial areas, industrial areas, development areas, and densely populated areas that do not meet the criteria for Level 4 areas;

[0012] d. Level 4 area: refers to a section where buildings of four or more stories (excluding basement levels) are generally concentrated, traffic is frequent, and underground facilities are abundant.

[0013] 2) When delineating the boundary lines of a region, the boundary line should be at least 200m away from the outer edge of the nearest building.

[0014] 3) Schools, hospitals, and other public places where people gather in Level I and Level II areas should be selected according to Level III areas.

[0015] 4) When a region’s development plan is sufficient to change the region’s existing level, the region level should be classified according to the development plan.

[0016] 2. Determination of potential influence radius

[0017] The potential impact area of ​​a gas gathering and transmission pipeline is the possible impact area calculated based on its potential impact radius. The potential impact radius of a gas gathering and transmission pipeline can be calculated using the following formula:

[0018]

[0019] In the formula:

[0020] d — outer diameter of the pipe, in millimeters (mm);

[0021] p—Maximum permissible operating pressure of the pipe section (MAOP), in megapascals (MPa);

[0022] r — the radius of the affected area, in meters (m).

[0023] 3. Standards for classifying specific locations

[0024] Specific locations refer to areas, excluding Level 3 and Level 4 areas, where pipeline leaks could potentially cause serious casualties. These include the following areas:

[0025] Specific Location I: Buildings where it is difficult to evacuate people, such as hospitals, schools, nurseries, nursing homes, prisons, and clinics;

[0026] Specific Location II: Areas where 30 or more people gather for at least 50 days a year (the time period does not need to be consecutive). Examples include farmers' markets, temples, sports fields, squares, recreational areas, theaters, campsites, village committees, quarries, brick factories, teahouses, etc.

[0027] According to the above standards, high-consequence zones need to be identified for each gas pipeline using the above identification methods, and a high-consequence zone identification report needs to be prepared. This method is commonly used for identifying high-consequence zones for each domestic long-distance pipeline, gas field gathering branch line, gathering trunk line, and independent gas production pipeline.

[0028] In tight gas fields like Sulige in China, single-well production is low, and the number of gas wells and production pipelines is enormous. To reduce development costs, the production pipelines adopt a low-pressure gas gathering mode with inter-well connection. Gas wells are connected to the main production pipeline via nearby production branch pipes, and the gas is uniformly transported to the gas gathering station. Furthermore, the production branch pipes are interconnected in close proximity, resulting in a dense pipeline network. If the standard procedure described above were used to identify high-consequence areas for each pipeline and compile reports, the workload would be too great, and the efficiency extremely low.

[0029] Chinese patent document CN114626650A discloses a method and apparatus for identifying high-consequence zones in oil and gas field gathering and transportation pipelines, belonging to the field of oil and gas field gathering and transportation pipeline integrity management. This scheme takes into account the dense, complex, and regionalized characteristics of oil and gas field gathering and transportation pipelines. It divides pipelines with similar characteristics into the same network unit, and further determines identification units based on these network units. Then, within the identification unit, it prioritizes searching for specific locations, flammable and explosive locations, and densely populated areas. Using these locations as a benchmark, it statistically analyzes the pipelines within their impact range to identify high-consequence zones. This scheme can accurately and efficiently identify high-consequence zones in oil and gas field gathering and transportation pipelines, providing an important foundation for pipeline risk control. Furthermore, this scheme is convenient and quick, greatly improving work efficiency. Subsequent focused monitoring of high-consequence zones can identify potential risk factors and effectively reduce the failure rate of gathering and transportation pipelines. This document requires the division and identification of units based on pipeline attribute data, which includes one or more of the following: construction year data, medium type data, pipe diameter data, pressure rating data, and pipe material data of the gathering and transportation pipeline; it is not easy to divide and the workload during division is large; the division area is scattered and large, which is not easy to operate and has low work efficiency. Summary of the Invention

[0030] The present invention provides a method for identifying high-consequence zones in gas field gas production pipeline interconnection networks. The purpose is to overcome the problems of existing technologies, such as the large workload and low efficiency of identifying high-consequence zones of dense and numerous gas production pipelines one by one using existing standard procedures and compiling reports, as well as existing methods for dividing identification units.

[0031] Therefore, the present invention provides a method for identifying high-consequence zones in gas field gas production pipeline interconnection networks, comprising the following steps:

[0032] S1. Divide the gas production pipeline network into multiple identification units according to the concentration of the pipelines, and divide each identification unit into multiple areas to be identified.

[0033] S2. Identify specific locations, flammable and explosive locations, and densely populated areas within each area to be identified;

[0034] S3. Extend the outer boundary line of the marked specific location, flammable and explosive location, and densely populated area outward parallel to the target distance by one. The pipe section included within the outer boundary line after the target distance is extended by one is the high-consequence zone pipe section.

[0035] S4. Statistically identify all high-consequence pipe sections in each identification unit to complete the identification of high-consequence areas in the gas production pipeline network.

[0036] Preferably, in step S1, the outer boundary of each identification unit is connected circumferentially by a straight line.

[0037] Preferably, in step S1, after the outer boundaries of each identification unit are connected circumferentially by straight lines, the boundary lines are extended outward by a target distance two in a parallel trend, and the area enclosed by the extended boundary lines is taken as an identification unit.

[0038] Preferably, in step S1, the identification unit is defined as a gas gathering station or a gas production operation area that manages a gas production pipeline network.

[0039] Preferably, in step S1, each identification unit is divided into multiple areas to be identified. Specifically, each identification unit takes the center of the gas gathering station or the gas production pipeline network under the jurisdiction of the gas production operation area as the starting point and radiates outward in a straight line. The area between two adjacent straight lines is the area to be identified.

[0040] Preferably, in each identification unit, the number of radiating straight lines is less than the number of straight lines in the outer boundary of the identification unit.

[0041] Preferably, the outer boundary is the outermost gas well in the identification unit.

[0042] Preferably, the target distance is 180-220m.

[0043] Preferably, the target distance is 180-220m.

[0044] Preferably, the densely populated area includes first-level areas, second-level areas, third-level areas and fourth-level areas. When the densely populated area is a first-level area or a second-level area, the pipe segments included within the outer boundary line after extending the target distance by one do not belong to the high-consequence area pipe segments.

[0045] The beneficial effects of this invention are:

[0046] 1. The high-consequence zone identification method for gas field gas production pipeline network provided by this invention divides the gas production pipeline network into multiple identification units according to the concentration of pipelines. Relatively concentrated series-connected gas production pipelines are treated as a single unit for high-consequence zone identification. Compared to the traditional method of identifying each pipeline individually, this significantly improves the efficiency of high-consequence zone identification. This invention does not require consideration of pipeline attribute data; it only needs to divide relatively concentrated pipelines into identification units based on their concentration, resulting in less workload and higher efficiency. Furthermore, each identification unit is further divided into multiple areas to be identified, and high-consequence zone identification is performed within each designated area, narrowing the identification range and facilitating simultaneous operation, thereby significantly reducing workload and improving efficiency.

[0047] 2. The high-consequence zone identification method for gas field gas production pipeline interconnection network provided by this invention connects the outer boundaries of each identification unit with straight lines in the circumferential direction. Two points can determine a boundary line. Compared with other lines such as arcs, this invention is easier to operate, and the divided boundaries are more intuitive and clear.

[0048] 3. The high-consequence zone identification method for gas field gas production pipeline network provided by this invention takes the center of the gas production pipeline network under the jurisdiction of the gas gathering station or gas production operation area as the starting point and radiates outward in a straight line. The area between two adjacent straight lines is the area to be identified. It is only necessary to start from the starting point to clearly identify the area to be identified and perform intuitive identification. The boundaries are clear, intuitive and easy to operate. Attached Figure Description

[0049] The present invention will now be described in further detail with reference to the accompanying drawings.

[0050] Figure 1 This is a schematic diagram of the gas production pipeline interconnection network of the Sulige Gas Field;

[0051] Figure 2 This is a schematic diagram showing the delineation of the gas production pipeline interconnection network identification unit;

[0052] Figure 3 This is a schematic diagram for identifying specific locations, flammable and explosive locations, and densely populated areas within the gas extraction pipeline unit;

[0053] Figure 4 This is a schematic diagram for identifying high-consequence zones within a gas production pipeline unit;

[0054] Figure 5 This is a flowchart of the existing method for identifying high-consequence zones in gas pipelines. Detailed Implementation

[0055] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0056] Example 1:

[0057] like Figures 1-4 As shown, a method for identifying high-consequence zones in gas field gas production pipeline interconnection networks includes the following steps:

[0058] S1. Divide the gas production pipeline network into multiple identification units according to the concentration of the pipelines, and divide each identification unit into multiple areas to be identified.

[0059] Preferably, in step S1, the outer boundary of each identification unit is connected circumferentially by a straight line.

[0060] Specifically, the outer boundary of each recognition unit is connected circumferentially by a straight line, and a boundary line can be determined by two points. Compared with other lines such as arcs, this invention is easier to operate, and the boundary area divided by circumferential connection is more intuitive and clear.

[0061] Preferably, in step S1, after the outer boundaries of each identification unit are connected circumferentially by straight lines, the boundary lines are extended outward by a target distance two in a parallel trend, and the area enclosed by the extended boundary lines is taken as an identification unit.

[0062] Specifically, the area determined by extending the boundary line parallel to the outside better meets the criteria for identifying high-consequence areas of gas pipelines.

[0063] Preferably, the target distance is 180-220m.

[0064] Specifically, a distance of 180-220m better meets the requirements of the high-consequence zone identification criteria for gas pipelines.

[0065] Preferably, in step S1, the identification unit is defined as a gas gathering station or a gas production operation area that manages a gas production pipeline network.

[0066] Specifically, since the pipelines within the gas gathering station or gas production area are relatively concentrated, using them as an identification unit makes them easier to divide and operate.

[0067] Preferably, in step S1, each identification unit is divided into multiple areas to be identified. Specifically, each identification unit takes the center of the gas gathering station or the gas production pipeline network under the jurisdiction of the gas production operation area as the starting point and radiates outward in a straight line. The area between two adjacent straight lines is the area to be identified.

[0068] Specifically, during operation, simply start from the starting point and radiate outwards in a straight line to clearly define the area to be identified, allowing for intuitive identification. The boundaries are clear, intuitive, and easy to operate.

[0069] Preferably, in each identification unit, the number of radiating straight lines is less than the number of straight lines in the outer boundary of the identification unit.

[0070] Specifically, this setting can reduce workload and improve work efficiency. In actual operation, select an appropriate number of radiation lines to efficiently complete the identification.

[0071] Preferably, the outer boundary is the outermost gas well in the identification unit.

[0072] Specifically, the outermost gas well is used as the fixed point of the boundary line, which is easy to locate and connect, and allows for reasonable division of identification units.

[0073] S2. Identify specific locations, flammable and explosive locations, and densely populated areas within each area to be identified;

[0074] Specifically, "specific locations" refers to areas outside of Level 3 and Level 4 areas where pipeline leaks could potentially cause serious casualties. These include the following areas:

[0075] Specific Location I: Buildings where it is difficult to evacuate people, such as hospitals, schools, nurseries, nursing homes, prisons, and clinics;

[0076] Specific Location II: Areas where 30 or more people gather for at least 50 days a year (the time period does not need to be consecutive). Examples include farmers' markets, temples, sports fields, squares, recreational areas, theaters, campsites, village committees, quarries, brick factories, teahouses, etc.

[0077] Preferably, the densely populated area includes first-level areas, second-level areas, third-level areas and fourth-level areas. When the densely populated area is a first-level area or a second-level area, the pipe segments included within the outer boundary line after extending the target distance by one do not belong to the high-consequence area pipe segments.

[0078] Specifically, densely populated areas include:

[0079] a. Level 1 areas: Sections with 15 or fewer households;

[0080] b. Secondary areas: Sections with 15 to 100 households;

[0081] c. Level 3 areas: Areas with 100 or more households, including suburban residential areas, commercial areas, industrial areas, development areas, and densely populated areas that do not meet the criteria for Level 4 areas;

[0082] d. Level 4 area: refers to a section where buildings of four or more stories (excluding basement levels) are generally concentrated, traffic is frequent, and underground facilities are abundant.

[0083] S3. Extend the outer boundary line of the marked specific location, flammable and explosive location, and densely populated area outward parallel to the target distance by one. The pipe section included within the outer boundary line after the target distance is extended by one is the high-consequence zone pipe section.

[0084] Specifically, when the densely populated area is a Level 1 or Level 2 area, the pipe segments included within the outer boundary line after extending the target distance by one are not considered high-consequence pipe segments.

[0085] Preferably, the target distance is 180-220m.

[0086] Specifically, a distance of 180-220m better meets the requirements of the high-consequence zone identification criteria for gas pipelines.

[0087] S4. Statistically identify all high-consequence pipe sections in each identification unit to complete the identification of high-consequence areas in the gas production pipeline network.

[0088] Specifically, by statistically analyzing all high-consequence zone pipe sections in each identification unit, a statistical table of high-consequence zone identification results for the gas production pipeline network can be used, such as Table 2. Other statistical methods can also be used to clearly and efficiently complete the identification of high-consequence zones in the gas production pipeline network.

[0089] Table 2. Statistical Table of High Consequence Zone Identification Results for Gas Production Pipeline Network

[0090]

[0091] This invention divides the gas production pipeline network into multiple identification units based on the concentration of the pipelines. Relatively concentrated series-connected gas production pipelines (the concentration level is determined according to actual requirements, as long as the needs are met) are treated as a single identification unit (overall unit) for high-consequence area identification. Compared to the traditional method of identifying each pipeline individually, this significantly improves the efficiency of high-consequence area identification. This invention does not require consideration of pipeline attribute data; it only needs to divide relatively concentrated pipelines into identification units based on their concentration level, resulting in less workload and higher efficiency. Furthermore, each identification unit is further divided into multiple areas to be identified. High-consequence area identification is performed within each designated area, narrowing the identification scope and facilitating simultaneous operation, thus greatly reducing workload and improving efficiency.

[0092] Example 2:

[0093] Based on Example 1, a method for identifying high-consequence zones in gas field gas production pipeline interconnection networks includes the following steps:

[0094] S1. Divide the gas production pipeline network into multiple identification units according to the concentration of the pipelines, and divide each identification unit into multiple areas to be identified.

[0095] Specifically, such as Figure 2 As shown, a gas gathering station is considered as an identification unit; specifically, the outermost gas wells of the gas gathering station are connected circumferentially by a straight line to determine the outer boundary of the identification unit; the outer boundary line is extended outward by 200 meters in a parallel trend (see...). Figure 3One identification unit is formed; the identification unit is radiated outward in a straight line from the center of the gas gathering station, and the number of straight lines is 5. The area between two adjacent straight lines is the area to be identified, forming 5 areas to be identified.

[0096] S2. Identify specific locations, flammable and explosive locations, and densely populated areas within each area to be identified;

[0097] For details, see Figure 3 Five areas to be identified were: a school in a specific location; a hospital in a specific location; a gas station in a flammable and explosive location; a village committee in a specific location; and a densely populated area.

[0098] S3. Extend the outer boundary line of the marked specific location, flammable and explosive location, and densely populated area outward parallel to the target distance by one. The pipe section included within the outer boundary line after the target distance is extended by one is the high-consequence zone pipe section.

[0099] For details, see Figure 4 Extend the outer boundary of a specific school location 200 meters outward in parallel. The rectangular dashed frame contains a pipe segment, which is the high-consequence zone.

[0100] The outer boundary of a hospital in a specific location extends outward parallel to the outside for 200 meters. The diamond-shaped dashed frame contains a pipe segment, which is the high-consequence zone.

[0101] The outer boundary of a gas station in a flammable and explosive location extends outward parallel to the outside for 200 meters. The triangular dashed frame contains a pipe section, which is the high-consequence zone.

[0102] The outer boundary of a village committee in a specific location extends outward parallel for 200 meters. The circular dashed frame contains a pipe section, which is the high-consequence zone.

[0103] The densely populated area has 6 households and is classified as a Level 1 area according to the regional classification standards. According to the high-consequence area identification criteria for gas pipelines in Table 1, the nearby pipelines are not considered high-consequence pipelines.

[0104] S4. Complete the identification of high-consequence areas in the gas production pipeline network.

[0105] In the description of this invention, it should be understood that any orientation or positional relationship indicated by terms such as "external" is based on the orientation or positional relationship shown in the drawings, and does not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are for illustrative purposes only and should not be construed as limiting the invention.

[0106] The above examples are merely illustrative of the present invention and do not constitute a limitation on the scope of protection of the present invention. All designs that are the same as or similar to the present invention are within the scope of protection of the present invention.

Claims

1. A method for identifying high-consequence zones in gas field gas production pipeline interconnection networks, characterized in that: Includes the following steps: S1. Divide the gas production pipeline network into multiple identification units according to the concentration of the pipelines, and divide each identification unit into multiple areas to be identified. S2. Identify specific locations, flammable and explosive locations, and densely populated areas within each area to be identified; S3. Extend the outer boundary line of the marked specific location, flammable and explosive location, and densely populated area outward parallel to the target distance by one. The pipe section included within the outer boundary line after the target distance is extended by one is the high-consequence zone pipe section. S4. Statistically identify all high-consequence pipe sections in each identification unit to complete the identification of high-consequence areas in the gas production pipeline network.

2. The method for identifying high-consequence zones applied to gas field gas production pipeline interconnection networks as described in claim 1, characterized in that: In step S1, the outer boundary of each identification unit is connected circumferentially by a straight line.

3. The method for identifying high-consequence zones applied to gas field gas production pipeline interconnection networks as described in claim 1, characterized in that: In step S1, after the outer boundary of each identification unit is connected circumferentially by a straight line, the boundary line is extended outward by a target distance of two in a parallel trend, and the area enclosed by the extended boundary line is taken as an identification unit.

4. The method for identifying high-consequence zones in gas field gas production pipeline interconnection networks as described in claim 3, characterized in that: In step S1, the identification unit is defined as a gas gathering station or gas production operation area that manages a gas production pipeline network.

5. The method for identifying high-consequence zones applied to gas field gas production pipeline interconnection networks as described in claim 4, characterized in that: In step S1, each identification unit is divided into multiple areas to be identified. Specifically, each identification unit takes the center of the gas gathering station or the gas production pipeline network under the jurisdiction of the gas production operation area as the starting point and radiates outward in a straight line. The area between two adjacent straight lines is the area to be identified.

6. The method for identifying high-consequence zones applied to gas field gas production pipeline interconnection networks as described in claim 5, characterized in that: In each identification unit, the number of radiating straight lines is less than the number of straight lines in the outer boundary of the identification unit.

7. The method for identifying high-consequence zones applied to gas field gas production pipeline interconnection networks as described in any one of claims 2 and 3, characterized in that: The outer boundary is the outermost gas well in the identification unit.

8. The method for identifying high-consequence zones applied to gas field gas production pipeline interconnection networks as described in claim 1, characterized in that: The target distance is 180-220m.

9. The method for identifying high-consequence zones applied to gas field gas production pipeline interconnection networks as described in claim 3, characterized in that: The target distance is 180-220m.

10. The method for identifying high-consequence zones applied to gas field gas production pipeline interconnection networks as described in claim 1, characterized in that: The densely populated areas include Level 1, Level 2, Level 3 and Level 4 areas. When the densely populated area is a Level 1 or Level 2 area, the pipe segments included within the outer boundary line after extending the target distance by one are not high-consequence pipe segments.

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