Design pressure determination method, apparatus, device and oil pipeline system

Abstract

This disclosure provides a method, apparatus, equipment, and oil pipeline system for determining the design pressure of an oil pipeline, belonging to the field of oil and gas transportation technology. The method includes: acquiring multiple hydraulic gradient lines, which are curves showing the relationship between pressure head and mileage of the oil pipeline under different pipeline flow rates; determining a benchmark pressure head line based on the multiple hydraulic gradient lines, where the benchmark pressure head at any mileage is not less than the pressure head at the corresponding mileage of any of the hydraulic gradient lines; and determining the design pressure of the oil pipeline based on the benchmark pressure head line. This disclosure can determine a reasonable design pressure for an oil pipeline, thereby avoiding the risk of overpressure in the oil pipeline.

Description

Technical Field

[0001] This disclosure relates to the field of oil and gas transportation technology, and in particular to a method, apparatus, equipment and oil pipeline system for determining the design pressure of an oil pipeline. Background Technology

[0002] An oil pipeline system is a pipeline system used to transport petroleum and petroleum products, including oil pipelines, oil depots, and other auxiliary equipment. An oil pipeline is a system composed of oil pipes and their accessories used to complete the unloading and transfer of oil.

[0003] In related technologies, to avoid the risk of overpressure in oil pipelines, it is necessary to first calculate the hydraulic gradient coefficient of the pipeline according to Bernoulli's formula, and then determine a hydraulic gradient line based on the hydraulic gradient coefficient. Next, the maximum working pressure of the oil pipeline is determined based on this hydraulic gradient line, and this maximum working pressure is used as the standard for selecting the oil pipeline, i.e., as the design pressure of the oil pipeline. Simultaneously, pressure relief valves, pressure relief tanks, and other pressure relief equipment are installed at the inlet and outlet stations along the pipeline as overpressure protection measures for the oil pipeline system.

[0004] However, even when the maximum working pressure is determined based on the hydraulic gradient and the selected oil pipeline is chosen accordingly, problems still arise during actual operation due to insufficient pressure-bearing capacity. These problems include pressure relief valve failure, pressure relief tank overflow, pilot valve sealing failure, and inadequate sealing or damage to various components of the pressure relief valve. This places a significant burden on the safe operation of the oil pipeline and causes economic losses. Furthermore, installing pressure relief equipment increases the number of leakage points at oil stations, thereby increasing the leakage risk at the stations. Summary of the Invention

[0005] This disclosure provides a method, apparatus, equipment, and oil pipeline system for determining design pressure, which can determine a reasonable design pressure for oil pipelines to avoid the risk of overpressure. The technical solution is as follows:

[0006] This disclosure provides a method for determining the design pressure of an oil pipeline. The method includes: acquiring multiple hydraulic gradient lines, which are curves showing the relationship between the pressure head and mileage of the oil pipeline under different pipeline flow rates; determining a benchmark pressure head line based on the multiple hydraulic gradient lines, where the benchmark pressure head is a curve showing the relationship between the benchmark pressure head and mileage, and the benchmark pressure head at any mileage is not less than the pressure head at the corresponding mileage of any of the hydraulic gradient lines; and determining the design pressure of the oil pipeline based on the benchmark pressure head line.

[0007] In one implementation of this disclosure, determining the reference head line based on the plurality of hydraulic gradient lines includes: increasing the head at each mileage on the intermediate head line according to the adjustment margin to obtain the reference head line, wherein the intermediate head line is the hydraulic gradient line with the largest head at each station among the plurality of hydraulic gradient lines.

[0008] In another implementation of this disclosure, the step of increasing the pressure head at each mileage on the intermediate pressure head line according to the adjustment margin to obtain the reference pressure head line includes: taking the exit pressure head of each calibration interval in the intermediate pressure head line as the pressure head corresponding to the calibration interval to obtain the intermediate reference pressure head line, wherein the calibration interval is the mileage between two adjacent oil pumping stations; and adding the adjustment margin to the pressure head of each calibration interval on the intermediate reference pressure head line to obtain the reference pressure head line.

[0009] In another implementation of this disclosure, determining the design pressure of the oil pipeline based on the reference head line includes: determining the pipeline head line for oil pipelines with different wall thicknesses according to pipeline parameters, wherein the pipeline head line is a curve relating the pressure head of the oil pipeline to its mileage, and any pipeline head line includes multiple sub-head lines, wherein the multiple sub-head lines are partial curves corresponding to each calibration interval of the pipeline head line, and the calibration interval is the mileage between two adjacent oil stations; comparing the maximum reference head of the reference head line with the pressure head of each sub-head line in each calibration interval, and determining a sub-head line in each calibration interval whose pressure head is greater than the maximum reference head of the reference head line; and determining the design pressure of the oil pipeline based on the pressure head of the sub-head line corresponding to each calibration interval.

[0010] In another implementation of this disclosure, determining the pipeline head line of oil pipelines with different wall thicknesses based on pipeline parameters includes: determining the pressure head of oil pipelines with different wall thicknesses based on pipeline parameters, wherein the pressure head is the sum of the liquid column height and elevation corresponding to the maximum pressure of the oil pipeline; and determining the pipeline head line of oil pipelines with different wall thicknesses based on the pressure head.

[0011] In another implementation of the present disclosure, each of the sub-head lines corresponding to the design pressure of the oil pipeline is a portion of the head line in the same pipeline head line; or, each of the sub-head lines corresponding to the design pressure of the oil pipeline includes a portion of the head line in at least two pipeline head lines.

[0012] In another implementation of this disclosure, obtaining multiple hydraulic gradient lines includes: determining the station head of the oil pipeline at different pipeline flow rates based on the inlet and outlet pressures of the oil pipeline station, wherein the station head includes the sum of the liquid column height and elevation corresponding to the inlet pressure and the sum of the liquid column height and elevation corresponding to the outlet pressure; and determining the hydraulic gradient lines of the oil pipeline at different pipeline flow rates based on the station head.

[0013] This disclosure provides an apparatus for determining the design pressure of an oil pipeline. The apparatus includes: a hydraulic gradient line acquisition module for acquiring multiple hydraulic gradient lines, which are curves showing the relationship between the pressure head and mileage of the oil pipeline under different pipeline flow rates; a reference pressure head line determination module for determining a reference pressure head line based on the multiple hydraulic gradient lines, where the reference pressure head line is a curve showing the relationship between the reference pressure head and mileage, and the reference pressure head at any mileage is not less than the pressure head at the corresponding mileage of any hydraulic gradient line; and a design pressure determination module for determining the design pressure of the oil pipeline based on the reference pressure head line.

[0014] This disclosure provides a computer device, the computer device including: a processor; a memory for storing processor-executable instructions; wherein the processor is configured to execute the method for determining the design pressure of an oil pipeline as described above.

[0015] This disclosure provides an oil pipeline system in which the design pressure of the oil pipeline is determined using the method described above.

[0016] The beneficial effects of the technical solutions provided in this disclosure include at least the following:

[0017] This disclosure provides a method for determining the design pressure of an oil pipeline. First, multiple hydraulic gradient lines are obtained, which represent the relationship between the pipeline head and mileage under different pipeline flow rates. Since the oil pipeline head varies with different flow rates, the corresponding head for each hydraulic gradient line also differs. Among the reference head lines determined by these multiple hydraulic gradient lines, the reference pressure at any mileage is not less than the head at the corresponding mileage for any hydraulic gradient line. That is, the reference head at any mileage is always greater than the head of any hydraulic gradient line, ensuring that the reference head is higher than the pressure the oil pipeline needs to withstand under various flow rates. Therefore, the design pressure of the oil pipeline determined using the reference head lines as a standard can also meet the maximum pressure requirements of the oil pipeline.

[0018] Since the determined design pressure of the oil pipeline can meet the pressure requirements of various oil volumes, there will be no overpressure problem in the oil pipeline. Therefore, there is no need to install pressure relief equipment in the oil pipeline system to avoid economic losses caused by damage to pressure relief equipment. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a flowchart of a method for determining the design pressure of an oil pipeline provided in an embodiment of this disclosure;

[0021] Figure 2 This is a flowchart of another method for determining the design pressure of an oil pipeline provided in this embodiment of the disclosure;

[0022] Figure 3 This is a graph showing the relationship between the mileage and pressure head of an oil pipeline provided in an embodiment of this disclosure;

[0023] Figure 4 This is a structural block diagram of a device for determining the design pressure of an oil pipeline provided in an embodiment of this disclosure;

[0024] Figure 5 This is a structural block diagram of a computer device provided in an embodiment of this disclosure. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this disclosure clearer, the embodiments of this disclosure will be described in further detail below with reference to the accompanying drawings.

[0026] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” “third,” and similar terms used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “an” or “a” and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms “comprising” or “including” and similar terms mean that the elements or objects preceding “comprising” or “including” encompass the elements or objects listed following “comprising” or “including” and their equivalents, and do not exclude other elements or objects. The terms “connected” or “linked” and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms “upper,” “lower,” “left,” “right,” “top,” and “bottom,” etc., are used only to indicate relative positional relationships, and these relative positional relationships may change accordingly when the absolute position of the described objects changes.

[0027] Figure 1 This is a flowchart illustrating a method for determining the design pressure of an oil pipeline according to an embodiment of this disclosure. Figure 1 As shown, the method for determining the design pressure of this oil pipeline is executed by a host computer, including:

[0028] Step 101: Obtain multiple hydraulic gradient lines.

[0029] The hydraulic gradient lines represent the relationship between head and mileage of an oil pipeline under different pipeline throughputs. Head is the height of the liquid column corresponding to pressure. Head and pressure are interchangeable, meaning head can be used to indicate pressure. Pipeline throughput refers to the annual transport capacity of the oil pipeline, calculated by dividing the annual throughput by the annual operating time (years). The annual throughput is the total amount of oil transported. Pipeline throughput can also be expressed as hourly throughput, calculated by dividing the annual throughput by the annual operating time (hours). Therefore, with annual throughput data available, it can be converted to hourly throughput. Furthermore, hourly throughput can be directly calculated from the annual throughput and annual operating time. In short, multiple hydraulic gradient lines represent the relationship between pressure and mileage along the oil pipeline under different annual throughputs.

[0030] Step 102: Determine the baseline pressure head line based on multiple hydraulic gradient lines.

[0031] The reference head curve represents the relationship between reference head and mileage. At any given mileage, the reference head is never less than the head at the corresponding mileage along any hydraulic gradient line. In other words, at any given mileage, the reference head is always greater than the head along any hydraulic gradient line, ensuring that the reference head is higher than the pressure that the pipeline needs to withstand for various oil delivery volumes.

[0032] Step 103: Determine the design pressure of the oil pipeline based on the reference pressure head line.

[0033] Since the pressure corresponding to the reference head of the reference head line can meet the pressure required by the oil pipeline, the design pressure of the oil pipeline determined according to the reference head line can also meet the pressure required by the oil pipeline.

[0034] This disclosure provides a method for determining the design pressure of an oil pipeline. First, multiple hydraulic gradient lines are obtained, which represent the relationship between the pipeline head and mileage under different pipeline flow rates. Since the oil pipeline head varies with different flow rates, the corresponding head for each hydraulic gradient line also differs. Among the reference head lines determined by these multiple hydraulic gradient lines, the reference pressure at any mileage is not less than the head at the corresponding mileage for any hydraulic gradient line. That is, the reference head at any mileage is always greater than the head of any hydraulic gradient line, ensuring that the reference head is higher than the pressure the oil pipeline needs to withstand under various flow rates. Therefore, the design pressure of the oil pipeline determined using the reference head lines as a standard can also meet the maximum pressure requirements of the oil pipeline.

[0035] Since the determined design pressure of the oil pipeline can meet the pressure requirements of various oil volumes, there will be no overpressure problem in the oil pipeline. Therefore, there is no need to install pressure relief equipment in the oil pipeline system to avoid economic losses caused by damage to pressure relief equipment.

[0036] Figure 2 This is a flowchart illustrating another method for determining the design pressure of an oil pipeline provided in this disclosure. Figure 2 As shown, the method for determining the design pressure of this oil pipeline is executed by a host computer, including:

[0037] Step 201: Based on the inlet and outlet pressures of the oil pipeline, determine the station head under different pipeline flow rates.

[0038] Optionally, prior to step 201, the method further includes: determining the inlet pressure and outlet pressure of each oil transportation station based on the pipeline characteristic parameters along the pipeline.

[0039] The characteristic parameters of the pipeline along the route can include the mileage, elevation, diameter, and throughput of the pipeline. When determining the inlet and outlet pressures of each oil transfer station, these parameters can be input into hydraulic system simulation software, such as SPS (Stoner Pipeline Simulator), to calculate and determine the inlet and outlet pressures of each station.

[0040] Among them, the inlet pressure calculated by the hydraulic system simulation analysis software needs to be greater than 0.5MPa. The outlet pressure is used to overcome the friction loss and elevation difference between the current gas transmission station and the next gas transmission station. Therefore, the outlet pressure needs to be greater than the sum of the friction loss and elevation difference. The friction loss can be determined based on the distance between two adjacent gas transmission stations, and the elevation difference can be determined based on the elevation between two adjacent gas transmission stations.

[0041] The mileage along an oil pipeline refers to the horizontal distance of the oil pipeline. It is usually assumed that the starting mileage of the oil pipeline is 0km, that is, the mileage of the starting oil station is 0km, and the mileage of each subsequent oil station is the horizontal distance relative to the starting point.

[0042] The elevation along an oil pipeline refers to the height of the oil pipeline above the horizontal plane, that is, the vertical distance between the oil pipeline and the horizontal plane.

[0043] Table 1 is a data table of mileage and elevation along an oil pipeline provided in an embodiment of this disclosure. As shown in Table 1, there are 5 oil pumping stations and 13 valve chambers along the oil pipeline. The oil pumping stations and valve chambers are distributed at intervals along the mileage, and each oil pumping station and valve chamber has a corresponding elevation.

[0044] Table 1

[0045]

[0046]

[0047] Pipeline capacity refers to the annual transport capacity of an oil pipeline. The annual transport capacity of an oil pipeline can be obtained from the output data of the pipeline in recent years, such as 5 million tons per year, 10 million tons per year, and 20 million tons per year.

[0048] In step 201, when determining the station pressure head based on the inlet and outlet pressures, the following method can be used:

[0049] The station head includes the inlet head and the outlet head. The inlet head is the sum of the liquid column height and elevation corresponding to the inlet pressure, and the outlet head is the sum of the liquid column height and elevation corresponding to the outlet pressure.

[0050] The liquid column height corresponding to the inlet pressure and the liquid column height corresponding to the outlet pressure can both be determined using formula (1):

[0051] H 液柱 =P / ρg (1)

[0052] In formula (1), H 液柱 ρ is the height of the liquid column, in meters (m); P is the inlet or outlet pressure, in Pa; ρ is the density of the liquid in the pipeline, in kg / m³. 3 g is the acceleration due to gravity, in m / s². 2 .

[0053] The pressure head of the station can be determined using formula (2):

[0054] H 压头 =P / ρg+elev (2)

[0055] In formula (2), H 压头 The station head is the pressure head in meters (m); elev is the elevation in meters (m). In other words, the station head is the sum of the liquid column height and the elevation corresponding to the station's location.

[0056] Each pipeline throughput corresponds to a set of station pressures, which include the inlet and outlet pressures of all oil pumping stations along the pipeline. Therefore, by substituting the set of station pressures for different pipeline throughputs into the above formulas (1) and (2), the station head of each oil pumping station under different pipeline throughputs can be determined.

[0057] Step 202: Determine the hydraulic gradient of the oil pipeline under different pipeline flow rates based on the station head.

[0058] The hydraulic gradient line is used to indicate the correspondence between mileage and head along the oil pipeline. The hydraulic gradient line consists of multiple sections, each a sloping line where the head gradually decreases with mileage. Each section represents the area between two adjacent oil pumping stations. Therefore, within each section, the head at the exit of the preceding oil pumping station corresponds to the head at the first mileage in that section, and the head at the entry of the next oil pumping station corresponds to the head at the last mileage in that section. The head corresponding to the mileage in the middle of each section corresponds to the head of the internal pressure of the oil pipeline.

[0059] In step 202, when determining the hydraulic gradient line, the mileage is used as the abscissa and the station head is used as the ordinate. This will result in multiple continuous oblique lines where the head gradually decreases as the mileage increases. These lines are the hydraulic gradient lines.

[0060] Figure 3 This is a graph showing the relationship between the mileage and pressure head of an oil pipeline according to an embodiment of this disclosure. Figure 3As shown, by using the mileage along the oil pipeline as the abscissa and the elevation along the oil pipeline as the ordinate, the longitudinal profile curve A of the oil pipeline can be drawn. The longitudinal profile curve A is used to reflect the changes of the oil pipeline along the terrain undulations.

[0061] like Figure 3 As shown, since the pressure head at the station is the sum of the liquid column height and the elevation, the hydraulic gradient line C is always located above the longitudinal profile curve A of the oil pipeline.

[0062] Since the pressure head of each oil pumping station includes the inlet pressure head and the outlet pressure head, and oil pumps are used to pressurize the oil when transporting oil in the same oil pumping station, so that the oil can be transported to the next oil pumping station with sufficient power, the outlet pressure head of the same oil pumping station is greater than the inlet pressure head.

[0063] like Figure 3 As shown, at each oil pumping station location, the station pressure head increases sharply; and between two adjacent oil pumping stations, the station pressure head with the largest pressure head is the outgoing pressure head of the preceding station, while the station pressure head with the smallest pressure head is the incoming pressure head of the following station. Therefore, a sharp change in station pressure head will occur between two adjacent diagonal lines in the hydraulic gradient (see E in the figure).

[0064] Based on step 201, the station head of each oil pumping station under different pipeline flow rates can be determined, that is, each pipeline flow rate corresponds to a set of station heads. Therefore, hydraulic gradient lines (C1, C2, C3, C4) under different pipeline flow rates can be drawn based on multiple sets of different station heads.

[0065] Step 203: Increase the pressure head at each mileage on the intermediate pressure head line according to the adjustment margin to obtain the reference pressure head line.

[0066] like Figure 3 As shown, the intermediate pressure head line C1 is the hydraulic gradient line C with the largest pressure head at each station among the multiple hydraulic gradient lines C.

[0067] Step 203 may include the following two steps:

[0068] The first step is to take the exit pressure head of each calibration interval F in the intermediate pressure head line C1 as the pressure head of the corresponding calibration interval F to obtain the intermediate reference pressure head line.

[0069] Among them, the calibration interval F is the mileage between two adjacent oil pumping stations.

[0070] In the first step, the mileage between two adjacent oil pumping stations is taken as the calibration interval F, that is, the calibration interval F is taken as the smallest calibration unit. Each calibration interval F is compared with the hydraulic gradient line (C1, C2, C3, C4) in which the outgoing pressure head of each calibration interval F is the largest (C1 in this embodiment). The hydraulic gradient line with the largest outgoing pressure head corresponding to each calibration interval F is determined as the intermediate pressure head line C1.

[0071] After determining the intermediate head line C1, the outbound head of each calibration interval F within the intermediate head line C1 is taken as the head of the corresponding calibration interval F. That is, the head of the entire calibration interval F (the distance between two adjacent oil pumping stations) is determined as the outbound head, thus obtaining the intermediate reference head line. In other words, the intermediate reference head line is a straight line that adjusts the hydraulic gradient line, which gradually increases with mileage, to a line where the head remains constant with mileage.

[0072] The second step is to add adjustment allowance to the pressure head of each calibration interval on the intermediate reference pressure head line to obtain the reference pressure head line.

[0073] As we know from the first step, the pressure head of each calibration interval F on the intermediate reference pressure head line is the outgoing pressure head of the oil pumping station. Therefore, adding an adjustment margin to the pressure head of each calibration interval F on the intermediate reference pressure head line is equivalent to adding an adjustment margin to the outgoing pressure head of the oil pumping station.

[0074] For example, the adjustment margin can be 1 MPa to 1.5 MPa. The adjustment margin is converted into a margin head using the above formulas (1) and (2). Then, the upper limit of the outlet head of the oil pumping station is increased by adding a margin head to the outlet head of the oil pumping station.

[0075] In the second step, the outlet pressure of the oil pumping station in each calibration interval F of the intermediate reference pressure head line, where the margin pressure head has already been added, is taken as the pressure head of each calibration interval F of the intermediate reference pressure head line, thus obtaining the reference pressure head line (see...). Figure 3 (G) That is, based on the intermediate reference pressure head line, the intermediate reference pressure head line is shifted upward by one distance to obtain the reference pressure head line G.

[0076] Step 204: Determine the pipeline head line for oil pipelines with different wall thicknesses based on pipeline parameters.

[0077] like Figure 3 As shown, pipeline head line D is the curve relating the pressure head of an oil pipeline to its mileage. Any pipeline head line D includes multiple sub-head lines (see...). Figure 3 The multiple curves shown in H are sub-curves, which are the partial curves corresponding to each calibration interval F in the pipeline pressure head line D.

[0078] Step 204 may include the following two steps:

[0079] The first step is to determine the pressure head of oil pipelines with different wall thicknesses based on the pipeline parameters.

[0080] Among them, the pressure head is the sum of the liquid column height and elevation corresponding to the maximum pressure of the oil pipeline.

[0081] The pressure head can be determined using formula (3):

[0082] H 承压 =2δ×0.72×σ s / Φ / g / ρ+elev (3)

[0083] In formula (3), H 承压 δ represents the pressure head, in meters (m); δ represents the pipeline wall thickness, in meters (m); σ represents the pressure head. s Φ represents the minimum yield strength of the pipeline material; Φ is the diameter of the pipeline (in meters); g is the acceleration due to gravity (in m / s²). 2 ρ represents the density of the liquid inside the oil pipeline, in kg / m³. 3 Elev is the elevation, in meters (m). The pressure head is the sum of the liquid column height corresponding to the maximum pressure of the oil pipeline and the elevation corresponding to the location of the station.

[0084] The second step is to determine the pipeline head line for oil pipelines with different wall thicknesses based on the pressure head.

[0085] like Figure 3 As shown, the pipeline head line D refers to the conversion of the maximum pressure of oil pipelines with different wall thicknesses into pressure head, and the curves (D1, D2, D3, D4, D5, D6) are plotted with mileage as the abscissa and pressure head as the ordinate.

[0086] Since the pressure head is the sum of the liquid column height and elevation corresponding to the maximum pressure of the oil pipeline, the pipeline pressure head line D is always located above the longitudinal profile curve A of the oil pipeline.

[0087] Step 205: Compare the maximum reference pressure head of the reference pressure head line with the bearing pressure head of each sub-pressure head line in each calibration interval, and determine a sub-pressure head line in each calibration interval whose bearing pressure head is greater than the maximum reference pressure head of the reference pressure head line.

[0088] Among them, the sub-head line H is a portion of the head line corresponding to each calibration interval F in the pipeline head line D. That is, the sub-head line H is the head line on the pipeline head line D corresponding to each calibration interval F.

[0089] In this embodiment of the disclosure, when comparing the pressure head of the oil pipeline in each calibration interval F with the maximum reference pressure head of the reference pressure head line G, such as Figure 3As shown, all the above curves can be plotted on a coordinate system. This allows us to determine the size relationship based on the positional relationship of the curves when comparing their magnitudes. For example, in a calibration interval F, if the sub-pressure head line H is located above the reference pressure head line G, it can be directly determined that the bearing pressure head of the sub-pressure head line H is greater than the reference pressure head of the reference pressure head line G.

[0090] In some implementations, the sub-head lines corresponding to the design pressure of the oil pipeline are the head lines of different parts of the same pipeline head line. That is, each calibration section uses an oil pipeline with the same wall thickness to facilitate the subsequent installation of the oil pipeline.

[0091] In other implementations, such as Figure 3 As shown, each sub-head line H corresponding to the design pressure I of the oil pipeline includes a portion of the head line from at least two pipeline head lines D. That is, the sub-head lines H, compared segment by segment, correspond to different pipeline wall thicknesses. Oil pipelines with different wall thicknesses are used between adjacent oil pumping stations. This method of using pipelines of appropriate thickness in different areas minimizes costs.

[0092] Step 206: Determine the design pressure of the oil pipeline based on the bearing head of the sub-head line corresponding to each calibration interval.

[0093] After determining the sub-pressure head line of each calibration interval, the maximum pressure of the oil pipeline can be calculated by using formula (3) and the pressure head determined by the sub-pressure head line, and the maximum pressure of the oil pipeline can be determined as the design pressure of the oil pipeline.

[0094] In this embodiment of the disclosure, after determining the design pressure of the oil pipeline using the above method, it is also possible to verify whether the design pressure of the oil pipeline meets the usage requirements. The verification process may include the following steps:

[0095] The first step is to simulate abnormal operating conditions at the oil transfer station.

[0096] Abnormal operating conditions may include: malfunctioning shut-off valves at the station entrance and exit, malfunctioning shut-off valves in the line valve chamber, and sudden power outages at the station. These abnormal operating conditions can be simulated using hydraulic calculation software (SPS software).

[0097] Because the pressure at various locations along the oil pipeline can change under abnormal operating conditions at oil pumping stations, various abnormal operating conditions are simulated to detect whether the pressure fluctuations along the oil pipeline exceed the design pressure of the oil pipeline, so as to ensure that the design pressure of the oil pipeline can meet the pressure requirements of various operating conditions.

[0098] The second step is to determine whether the design pressure of the oil pipeline meets the usage requirements based on the simulation results.

[0099] If, during the verification process, the pressure along the oil pipeline does not exceed the design pressure of the oil pipeline, it can be determined that the design pressure of the oil pipeline meets the usage requirements.

[0100] If, during the verification process, the pressure in some oil pipelines exceeds the design pressure, it can be determined that the design pressure of the oil pipelines does not meet the usage requirements. The design pressure of the overpressured sections of the oil pipelines can be increased, and the simulation verification can be performed again until the design pressure of all oil pipelines meets the requirements.

[0101] By verifying whether the design pressure of the oil pipeline meets the usage requirements, it can be ensured that the oil pipeline will not exceed the pipeline's pressure capacity due to abnormal operating conditions, thus ensuring that the design pressure of the oil pipeline meets the usage requirements.

[0102] This disclosure provides an oil pipeline system in which the design pressure of the oil pipeline is determined using the method described above.

[0103] Figure 4 This is a structural block diagram of a device for determining the design pressure of an oil pipeline provided in an embodiment of this disclosure. Figure 4 As shown, the determining device 400 includes: a hydraulic gradient line acquisition module 410, a reference pressure head line determination module 420, and a design pressure determination module 430.

[0104] The hydraulic gradient line acquisition module 410 is used to acquire multiple hydraulic gradient lines, which are curves showing the relationship between the pressure head and mileage of the oil pipeline under different pipeline flow rates. The reference pressure head line determination module 420 is used to determine the reference pressure head line based on the multiple hydraulic gradient lines. The reference pressure head line is a curve showing the relationship between the reference pressure head and mileage. The reference pressure head at any mileage is not less than the pressure head at the corresponding mileage of any hydraulic gradient line. The design pressure determination module 430 is used to determine the design pressure of the oil pipeline based on the reference pressure head line.

[0105] Optionally, the reference head line determination module 420 is also used to increase the head at each mileage on the intermediate head line according to the adjustment margin to obtain the reference head line. The intermediate head line is the hydraulic gradient line with the largest head at each station among the head of multiple hydraulic gradient lines.

[0106] like Figure 4 As shown, the reference head line determination module 420 includes: a first determination submodule 421 and an adjustment submodule 422. The first determination submodule 421 is used to take the exit head of each calibration interval in the intermediate head line as the head of the corresponding calibration interval to obtain the intermediate reference head line. The calibration interval is the mileage between two adjacent oil pumping stations. The adjustment submodule 422 is used to add adjustment margin to the head of each calibration interval on the intermediate reference head line to obtain the reference head line.

[0107] like Figure 4 As shown, the design pressure determination module 430 includes: a second determination submodule 431, a comparison submodule 432, and a third determination submodule 433. The second determination submodule 431 is used to determine the pipeline head line of oil pipelines with different wall thicknesses based on pipeline parameters. The pipeline head line is the relationship curve between the pressure head and mileage of the oil pipeline. Any pipeline head line includes multiple sub-head lines, which are partial curves corresponding to each calibration interval in the pipeline head line. The calibration interval is the mileage between two adjacent oil stations. The comparison submodule 432 is used to compare the maximum reference head of the reference head line and the pressure head of each sub-head line in each calibration interval, and determine a sub-head line whose pressure head is greater than the maximum reference head of the reference head line in each calibration interval. The third determination module 433 is used to determine the design pressure of the oil pipeline based on the pressure head of the sub-head lines corresponding to each calibration interval.

[0108] Optionally, the second determining submodule 431 is also used to determine the pressure head of oil pipelines with different wall thicknesses based on pipeline parameters. The pressure head is the sum of the liquid column height and elevation corresponding to the maximum pressure of the oil pipeline; and to determine the pipeline pressure head line of oil pipelines with different wall thicknesses based on the pressure head.

[0109] Optionally, each sub-head line corresponding to the design pressure of the oil pipeline is a portion of the head line in the same pipeline head line; or, each sub-head line corresponding to the design pressure of the oil pipeline includes a portion of the head line in at least two pipeline head lines.

[0110] like Figure 4 As shown, the hydraulic gradient line acquisition module 410 includes: a head determination submodule 411 and a fourth determination submodule 412. The head determination submodule 411 is used to determine the station head of the oil pipeline under different pipeline flow rates based on the inlet and outlet pressures of the oil pipeline station. The station head includes the sum of the liquid column height and elevation corresponding to the inlet pressure, and the sum of the liquid column height and elevation corresponding to the outlet pressure. The fourth determination submodule 412 is used to determine the hydraulic gradient line of the oil pipeline under different pipeline flow rates based on the station head.

[0111] Figure 5 This is a structural block diagram of a computer device provided in an embodiment of this disclosure, such as... Figure 5 As shown, the computer device includes a processor 501 and a memory 502.

[0112] Processor 501 may include one or more processing cores, such as a quad-core processor, an octa-core processor, etc. Processor 501 may be implemented using at least one hardware form selected from DSP (Digital Signal Processing), FPGA (Field-Programmable Gate Array), and PLA (Programmable Logic Array). Processor 501 may also include a main processor and a coprocessor. The main processor, also known as a CPU (Central Processing Unit), is used to process data in the wake-up state; the coprocessor is a low-power processor used to process data in the standby state. In some embodiments, processor 501 may integrate a GPU (Graphics Processing Unit), which is responsible for rendering and drawing the content to be displayed on the screen. In some embodiments, processor 501 may also include an AI (Artificial Intelligence) processor, which is used to handle computational operations related to machine learning.

[0113] The memory 502 may include one or more computer-readable storage media, which may be non-transitory. The memory 502 may also include high-speed random access memory and non-volatile memory, such as one or more disk storage devices or flash memory devices. In some embodiments, the non-transitory computer-readable storage media in the memory 502 are used to store at least one instruction, which is executed by the processor 501 to implement the method for determining the design pressure of an oil pipeline provided in the method embodiments of this application.

[0114] In some embodiments, the computer device may also optionally include: a peripheral device interface 503 and at least one peripheral device. The processor 501, memory 502, and peripheral device interface 503 can be connected via a bus or signal line. Each peripheral device can be connected to the peripheral device interface 503 via a bus, signal line, or circuit board.

[0115] Those skilled in the art will understand that Figure 5 The structure shown does not constitute a limitation on the computer device and may include more or fewer components than shown, or combine certain components, or use different component arrangements.

[0116] This disclosure also provides a non-transitory computer-readable storage medium storing computer instructions for causing a computer to execute the method for determining the design pressure of an oil pipeline as described in the above embodiments. For example, the computer-readable storage medium may be a ROM, random access memory (RAM), CD-ROM, magnetic tape, floppy disk, or optical data storage device.

[0117] Those skilled in the art will understand that all or part of the steps of the above embodiments can be implemented by hardware or by a program instructing related hardware. The program can be stored in a computer-readable storage medium, such as a read-only memory, a disk, or an optical disk.

[0118] The above is not intended to limit this disclosure in any way. Although this disclosure has been disclosed above through embodiments, it is not intended to limit this disclosure. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the technical solution of this disclosure. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of this disclosure without departing from the content of the technical solution of this disclosure shall still fall within the scope of the technical solution of this disclosure.

Claims

1. A method of determining a design pressure of an oil pipeline, characterized by, The determination method comprises: obtaining a plurality of hydraulic gradient lines, the plurality of hydraulic gradient lines being head-mileage curves of the oil pipeline under different pipeline throughputs; determining a reference head line based on the plurality of hydraulic gradient lines, the reference head line being a head-mileage curve, and the reference head at any mileage being not less than the head of any of the hydraulic gradient lines at the corresponding mileage; the determining of the reference head line based on the plurality of hydraulic gradient lines comprises: increasing the head at each mileage on an intermediate head line according to an adjustment allowance to obtain the reference head line, the intermediate head line being the hydraulic gradient line with the maximum head at each outlet among the plurality of hydraulic gradient lines; the increasing of the head at each mileage on the intermediate head line according to the adjustment allowance to obtain the reference head line comprises: taking the outlet head of each calibration interval in the intermediate head line as the head corresponding to the calibration interval to obtain an intermediate reference head line, the calibration interval being the mileage between two adjacent oil loading stations; and adding the adjustment allowance to the head of each calibration interval on the intermediate reference head line to obtain the reference head line; determining the design pressure of the oil pipeline based on the reference head line, the determining of the design pressure of the oil pipeline based on the reference head line comprising: determining the pipeline head line of the oil pipeline with different wall thicknesses according to pipeline parameters, the pipeline head line being a pressure-bearing head-mileage curve of the oil pipeline, any of the pipeline head lines comprising a plurality of sub-head lines, the plurality of sub-head lines respectively being the partial curve corresponding to each calibration interval in the pipeline head line, the calibration interval being the mileage between two adjacent oil loading stations; comparing the maximum reference head of the reference head line and the pressure-bearing head of each of the sub-head lines in each of the calibration intervals one by one to determine one of the sub-head lines with the pressure-bearing head greater than the maximum reference head of the reference head line in each of the calibration intervals; and determining the design pressure of the oil pipeline based on the pressure-bearing head of each of the sub-head lines corresponding to each of the calibration intervals.

2. The determination method according to claim 1, characterized in that, The determining of the pipeline head line of the oil pipeline with different wall thicknesses according to pipeline parameters comprises: determining the pressure-bearing head of the oil pipeline with different wall thicknesses according to pipeline parameters, the pressure-bearing head being the sum of the liquid column height and the elevation corresponding to the maximum pressure-bearing of the oil pipeline; determining the pipeline head line of the oil pipeline with different wall thicknesses based on the pressure-bearing head.

3. The determination method according to claim 1, characterized in that, Each of the sub-head lines corresponding to the design pressure of the oil pipeline is a partial head line in the same pipeline head line; or Each of the sub-head lines corresponding to the design pressure of the oil pipeline comprises partial head lines in at least two pipeline head lines.

4. The determination method according to claim 1, characterized in that, The obtaining of the plurality of hydraulic gradient lines comprises: determining the station head of the oil pipeline under different pipeline throughputs based on the inlet pressure and the outlet pressure of the oil loading station, the station head comprising the sum of the liquid column height and the elevation corresponding to the inlet pressure, and the sum of the liquid column height and the elevation corresponding to the outlet pressure; determining the hydraulic gradient line of the oil pipeline under different pipeline throughputs based on the station head.

5. An apparatus for determining a design pressure of an oil pipeline, characterized by The determination device comprises: The hydraulic slope line acquisition module is configured to acquire a plurality of hydraulic slope lines, which are head-mileage curves of the oil pipeline under different pipeline throughputs. The reference head line determination module is configured to determine a reference head line based on the plurality of hydraulic slope lines, the reference head line being a head-mileage curve, and the reference head at any mileage being not less than the head of any of the hydraulic slope lines at the corresponding mileage; the determination of the reference head line based on the plurality of hydraulic slope lines comprises: increasing the head at each mileage on an intermediate head line based on an adjustment allowance to obtain the reference head line, the intermediate head line being a hydraulic slope line in which each outbound head is the largest among the heads of the plurality of hydraulic slope lines; the increasing of the head at each mileage on the intermediate head line based on the adjustment allowance to obtain the reference head line comprises: taking the outbound head of each calibration interval in the intermediate head line as the head corresponding to the calibration interval to obtain an intermediate reference head line, the calibration interval being the mileage between two adjacent oil loading stations; and adding the adjustment allowance to the head of each calibration interval on the intermediate reference head line to obtain the reference head line. The design pressure determination module is configured to determine the design pressure of the oil pipeline based on the reference head line, and the determination of the design pressure of the oil pipeline based on the reference head line comprises: determining the pipeline head line of the oil pipeline with different wall thicknesses based on pipeline parameters, the pipeline head line being a pressure-bearing head-mileage curve of the oil pipeline, any of the pipeline head lines comprising a plurality of sub-head lines, the plurality of sub-head lines respectively being partial curves corresponding to each calibration interval in the pipeline head line, the calibration interval being the mileage between two adjacent oil loading stations; comparing the maximum reference head of the reference head line and the pressure-bearing head of each sub-head line in each calibration interval one by one to determine, in each calibration interval, the sub-head line whose pressure-bearing head is greater than the maximum reference head of the reference head line; and determining the design pressure of the oil pipeline based on the pressure-bearing head of the sub-head line corresponding to each calibration interval.

6. A computer device, comprising: The computer device comprises: a processor; a memory for storing processor-executable instructions; wherein the processor is configured to execute the method for determining the design pressure of the oil pipeline according to any one of claims 1 to 4.

7. An oil pipeline system characterized by, The design pressure of the oil pipeline of the oil pipeline system is determined by the method for determining the design pressure of the oil pipeline according to any one of claims 1 to 4.

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