Nuclear inspection method and system for multi-oil crude oil transiting through long-distance pipelines

Abstract

The present invention relates to a method and system for checking the transit of multiple types of crude oil through a long-distance pipeline, especially the customs transit. The method is particularly suitable for checking the transit of single-type oil from a single oil tanker, multiple types of oil from a single oil tanker, and multiple types of oil from multiple oil tankers. Its operating system detects the crude oil entering the tank at the unloading port, the crude oil data in the crude oil tank, and the pipeline transmission data, and transmits them to the destination. After loading the original data of the crude oil, the corresponding data is weighted averaged, and can be compared with the destination detection node data by itself, so that the customs can complete the inspection of multiple types of crude oil passing through the long-distance pipeline and trace the oil types and sources.

Description

Technical Field

[0001] The invention relates to a nuclear inspection method for crude oil of multiple oil types when it passes through a long-distance pipeline, especially when it passes through a customs. Background Art

[0002] Crude oil is a complex mixture of multiple components. It is unprocessed petroleum. The quality of crude oil varies from country to country, region to region, and even from oil-producing layer to oil-producing layer. Li Xiulin et al. wrote "Research on the Quality Analysis of China-Myanmar Pipeline Crude Oil" (Yunnan Chemical Industry, Vol. 50, No. 5, 2023) to analyze and study the quality indicators of crude oil from different countries. When the crude oil pipeline only transports one type of crude oil into the country, it is easy for the customs to determine and detect the type of crude oil and the amount of crude oil entering the country. However, when different types of oil are continuously transported in a pipeline in different batches and uncertain orders, the tankers used for crude oil of different types of oil must be stored in tanks after docking, and then enter the country through long-distance pipelines. When passing through the customs inspection node, the characteristic parameters of the oil in the long-distance pipeline have already been different from the characteristic parameters provided by the crude oil provider, because a small amount of mixed oil process is generated during the above storage and transportation process and cannot be compared. In this way, it is difficult for the customs to correspond to and trace the type of oil and source when taking oil for inspection at a certain node, which brings troubles to the crude oil inspection work. CN113655019A provides a method for detecting the mixed oil interface of pipeline crude oil. It is used for detecting the situation where different types of crude oil are transported multiple times in the pipeline and there are multiple mixed oil interfaces. It can accurately determine the beginning, middle and end stages of the crude oil mixed oil interface so as to guide the oil receiving station to cut and collect the crude oil in time. It is not suitable for customs to detect and trace the crude oil. Summary of the invention

[0003] The difference between a crude oil pipeline that continuously transports different types of oil into the country and only transports one type of crude oil into the country is that there is not only a lag between the time when the crude oil arrives at the port and the time when the crude oil passes the customs inspection node, but also that an oil tanker may carry a variety of oil types from different sources or different oil types from the same country, and the same type of crude oil may be transported to different crude oil storage tanks, so that the same type of crude oil is transported separately at different time periods. In addition, when the crude oil is transported, it will be mixed with different oil products due to the bottom oil in the tank when it arrives at the port, and the residual oil left by the oil transfer arm will also be brought into different storage tanks to form mixed oil during the next oil transfer. Crude oil contains a certain amount of salt and water when it is mined, and water exists in three forms: emulsion, free state and dissolved state. The amount of water in the form of emulsion and dissolved state is low, which is reflected in the density of the oil product. When water exists in a free state, it is usually placed at the bottom of the container due to the sedimentation during the movement of crude oil. In order to avoid data interference, clean oil needs to be used for measurement.

[0004] According to the above characteristics, the nuclear inspection method of multi-oil crude oil transiting through a long-distance pipeline of the present invention at least comprises the following steps:

[0005] 1) After the crude oil arrives at the port, the volume under standard working conditions is measured on the tanker, and the oil product analysis is performed to obtain the crude oil characteristic parameters including the density and water content of the crude oil. Usually, the commodity inspection report issued by a third-party qualified commodity inspection agency is adopted.

[0006] 2) After the crude oil is unloaded at the port, the corresponding tank number, the amount of oil at the bottom of the tank, and the amount and properties of residual oil remaining in the unloading arm and the tank area pipeline before the crude oil unloading port are recorded, the amount of crude oil unloaded into the crude oil tank is measured, and the amount and related properties of the newly unloaded crude oil are weighted averaged with the amount and properties of the previous tank bottom oil, and the amount and properties of residual oil remaining in the unloading arm and pipeline to obtain the amount of mixed crude oil formed in the crude oil tank and related oil product characteristic parameters.

[0007] 3) When crude oil is transported from the crude oil tank to the long-distance pipeline, batches are formed and numbered. The numbers are unique, the amount of crude oil transported is recorded, and the location of the oil section is tracked; when the oil section arrives at the detection node, the crude oil volume is measured, and the characteristic parameters of the oil sampled at the node are analyzed.

[0008] 4) Compare the crude oil quantity and oil product characteristic parameters calculated when the crude oil is delivered from the crude oil tank with the crude oil quantity and oil product characteristic parameters detected during the same period.

[0009] The transit inspection described in the present invention not only includes customs inspection, but also can complete the inspection process of multiple oil types of crude oil pipelines when the detection node is set as the destination inspection, all of which fall within the protection scope of the present invention.

[0010] When applying the present invention, one situation is when crude oil testing involves crude oil from different crude oil tanks and sampling at multiple time points, each set of data must be weighted averaged to obtain the final crude oil quantity and oil product characteristic parameters.

[0011] When applying the present invention, one scenario is that when measuring the crude oil passing through the detection node in a certain time period to verify its source, the oil characteristic parameters and crude oil quantity sampled by all analysis nodes measured in the time period are weighted averaged, and the crude oil quantity output by all specific crude oil tanks recorded in the time period and the oil characteristic parameters formed by step (2) need to be weighted averaged, including multiple different crude oil tanks, and compared separately to obtain the difference.

[0012] The same method can also be used to verify the single-variety oil in a single tanker, multiple varieties of oil in a single tanker, and multiple varieties of oil in transit through pipelines from multiple tankers.

[0013] When the present invention is applied, usually when the data after comparison in step (4), that is, the difference in the oil product characteristic parameters obtained is within the measurement analysis accuracy or error range and the difference in the crude oil quantity is within the pipeline loss, it is considered to be consistent with the recorded crude oil tank output facts.

[0014] That is, if the difference between the oil characteristic parameters sampled at the detection node, the amount of crude oil passing through, the calculated oil characteristic parameters and the statistical amount of crude oil is within the range of pipeline loss and metering accuracy or error, and the comparison results are basically consistent, that is, within the range of analysis reproducibility, it can be determined that the crude oil at the unloading port has reached the destination or has completed pipeline transportation at a certain detection node.

[0015] The oil product characteristic parameter described in the present invention may be density, and the present invention does not exclude the use of other oil product characteristic parameters besides density. Since density is the most basic indicator in the detection data, it needs to be used for calculating the weight of crude oil.

[0016] When making weighted average of data, the crude oil volume is the net oil volume (i.e. crude oil volume minus water content). For oils with similar density, sulfur content is added for weighted average and then compared. Other characteristic parameters that can be used include parameters with good reproducibility such as the content of heavy metals such as nickel and vanadium.

[0017] The present invention also provides an operating system that can execute the present invention, which includes data detection, data collection, computer data processing operation, and data result output. By sharing data with the crude oil tank area, the customs can complete the nuclear inspection of multiple types of crude oil passing through the long-distance pipeline.

[0018] The system detects the crude oil data at the crude oil unloading port, the crude oil data in the crude oil tank and the pipeline transmission data, and transmits them to the destination. After loading the original crude oil data, the corresponding data is weighted averaged, and it can be compared with the destination detection node data to obtain the data analysis results and download the results. The destination can be a customs detection node.

[0019] Through the technology of the present invention, the crude oil transported through pipelines after unloading into tanks at the port can be matched with the crude oil at the destination or a certain node in terms of properties and data, and the quantity accuracy can be controlled within the range of pipeline loss, measurement error and analysis repeatability. It can effectively trace the source of any crude oil transported in the pipeline system and achieve measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The figure shows the process of the inspection of multiple types of crude oil passing through a long-distance pipeline involved in the present invention.

[0021] Before shipping crude oil enters the system, the single batch quantity is large. After entering the system, it is decomposed into multiple batches through oil tanks. The quantity of each batch becomes smaller, but the total amount remains unchanged according to the law of conservation of matter. There is a process for crude oil to move to a certain node. This movement process is a physical process and does not change its properties. It takes time and the batches are fragmented and moved. The size of the batch is quantified with a smaller measurement unit of mass. The automation of the test instrument and the powerful statistical calculation function of the computer, as well as the transmission and sharing of data, make the present invention more convenient and accurate. DETAILED DESCRIPTION

[0022] Take the crude oil arrival and pipeline transportation situation at a certain port in the first quarter from the end of 2023 to the first quarter of 2024 as an example.

[0023] Example 1: The movement and density change of crude oil after unloading, i.e. the traceability of the quantity and properties of crude oil

[0024] The crude oil arriving at the port from December 2023 to March 2024 is stored in the crude oil tank after being tested and measured on board. Since most of them are frequently purchased oil types, numbers are used after the oil types to represent the number of times the oil type has been purchased for the convenience of calculation. The oil types arriving at the port, the tankers used, the arrival time, and the ship inspection data are shown in Table 1.

[0025] Table 1

[0026]

[0027]

[0028] After the 15 ships of crude oil enter the tank, they are mixed with the tank bottom oil formed after the crude oil in the previous tank is delivered. Due to the large size of the unloading arm and the connected tank area pipeline, the impact of the crude oil retention during the transfer process on the properties and quantity of the crude oil is also considered. The number and density of each ship of crude oil and the new oil section formed during the transfer process are recorded, and each oil section entering the long-distance pipeline for transportation is batched for easy tracking.

[0029] For example, the crude oil delivery situation arriving at the port in January is shown in Table 2.

[0030] Table 2:

[0031]

[0032]

[0033] The crude oil delivered to the port in January forms a new batch. The mixing of crude oil is shown in Table 3. BH01 oil is delivered to the port in November, with a density of 907.2 kg / m 3 Part of the crude oil is unloaded into tank T0202. After the crude oil is output from the tank to the long-distance pipeline, the tank then unloads the crude oil from AM122.

[0034] Table 3:

[0035] Oil Type Oil name Oil product proportion Main oil products at the bottom of the tank Tank bottom ratio Oil unloading arm Oil unloading arm ratio AM122 AM 86.62％ A07 11.96％ K54 1.42％ AM122 AM 85.58％ K54 12.89％ K54 1.53％ AM122 AM 86.32％ BH01 12.25％ K54 1.43％ A09 A 85.47％ K54 12.37％ AM122 2.16％ A09 A 84.23％ AS29 13.68％ AM122 2.09％ W10 W 84.47％ K54 13.24％ A09 2.29％ W10 W 85.54％ AM122 12.35％ A09 2.11％ K55 K 86.51％ K54 12.41％ AM123 1.08％ K55 K 86.59％ A08 12.32％ AM123 1.09％ AM123 AM 85.63％ K54 13.26％ W10 1.11％ AM123 AM 85.88％ W10 13.03％ W10 1.09％ AM124 AM 85.60％ AM122 13.25％ AM123 1.15％ AM124 AM 85.78％ AM123 13.12％ AM123 1.10％ AM124 AM 86.17％ AM123 12.73％ AM123 1.10％ R1 R 85.61％ A09 13.32％ AM124 1.07％

[0036] The length of the oil section is calculated based on the mixing conditions of the crude oil and the density is corrected, see Table 4.

[0037] Table 4:

[0038]

[0039]

[0040] Similarly, the crude oil arriving at the port in February and March is also recorded and calculated in the same way, and the transfer process of the crude oil arriving at the port is recorded. It is sorted according to the time of delivery, and then the time to a certain node is tracked according to the speed of delivery, and detailed records are made, and the density and quantity measured to the node are analyzed, which can be counted by day or hour; in addition, when a certain node is used as a detection point, reverse tracking can be performed for data comparison.

[0041] Example 2:

[0042] Record the quantity and density of crude oil that arrives at the customs inspection node within a period of time. For example, record the oil segments passing through the node and the corresponding quantity and density from January 10 to April 2, 2024, as shown in Table 5, where the net oil quantity values ​​passing through the node each day may come from different adjacent batches.

[0043] Table 5:

[0044]

[0045] The batch number corresponds to the quantity and properties of the crude oil at the time of transportation. The corresponding results are shown in Table 6.

[0046] Table 6:

[0047]

[0048] When this part of crude oil is matched to the tanker at the unloading port, one tank of A07 is in the previous statistical interval, and part of A10 crude oil stays in the pipeline from the crude oil tank area to the customs inspection node and the part in the tank that has not been exported needs to be reduced. The oil volume of the tanker that can be matched is 2611748.937 tons, and the weighted average density is 879.4kg / m 3The measurement error is calculated according to the national standard of 0.02%, and the pipeline loss is calculated according to the limit of 0.06%. From January 10 to April 2, 2024, the difference in the amount of crude oil transported from the oil tank to the detection node shall not be less than 0.08% of the starting amount or within 0.08% of the amount passing through the node, and the difference in weighted average density according to the density reproducibility requirement shall not be less than 1.5kg / m 3 It is considered reasonable. Calculated based on the starting volume, 0.08% is 2089.399 tons, while the difference between the starting volume and the node throughput is 132.678 tons, which is within the required range; the density difference is only 0.1kg / m 3 , which is lower than the reproducibility value, that is, this method has higher reliability.

[0049] The longer the comparison period is, the closer the weighted average density of the initial input and the throughput to the node will be.

[0050] Example 3: Traceability of crude oil quantities

[0051] The total amount of crude oil unloaded from the ship can also be regressed based on the mixing of the amount of crude oil passing through the customs inspection node and the movement processes such as unloading and storage. For example, the AS30 crude oil transported to the port by tanker N on February 13, 2024, with a net oil volume of 139433.798 tons, was unloaded in crude oil tanks T0201 and T0202 respectively. AS30 crude oil and K56 crude oil arrived at the port at the same time. AS30 crude oil was unloaded first and then K56 crude oil. The AS30 crude oil remaining in the unloading arm and the tank area pipeline entered the T0205 and T0209 tanks along with the K56 crude oil. As the two batches 202407-2024020 and 202407-202423 were exported to the long-distance pipeline on February 20 and March 1, 2024, AS30 crude oil was transported to the long-distance pipeline through 202407-2024021 and 202407-2023 on February 15 and February 23, 2024 respectively. 419 entered the long-distance pipeline in two batches. After deducting other types of crude oil mixed in the unloading arms, tank area pipelines and tank bottom oil, the amount of AS30 crude oil transported through these four batches was 121,082.288 tons. After adding AM125 and W11 crude oil in the form of bottom oil of crude oil tank T0201 and crude oil tank T0202 respectively, a total of 17,693.892 tons of AS30 crude oil were transported through batches 202408-2024022 and 202407-202423 on February 25 and February 27, 2024. The remaining 657.618 tons of AS30 crude oil remained in the bottom oil of tanks T0201 and T0202 to form secondary dilution, and was transported to the customs inspection node after mixing with the crude oil subsequently unloaded into the tank.

[0052] Example 4: Accuracy of system inventory

[0053] The data from 8:00 a.m. on December 31, 2023 to 8:00 a.m. on March 31, 2024 are accumulated and the results are shown in Table 7. From the data in Table 7, it can be seen that the loss rate is 0.029% of the oil, and the accuracy reaches the measurement level.

[0054] Table 7:

[0055]

Claims

1. The nuclear inspection method for the transit of multiple types of crude oil through long-distance pipelines is characterized by The method comprises at least the following steps: 1) measuring the volume of crude oil under standard working conditions on the tanker after the crude oil arrives at the port, and performing oil product analysis to obtain crude oil characteristic parameters including density and water content of the crude oil; 2) After the crude oil is unloaded at the port, the corresponding tank number, the amount of oil at the bottom of the tank, and the amount and properties of residual oil in the oil transfer arm and pipeline before the crude oil is unloaded are recorded, the amount of crude oil unloaded into the crude oil tank is measured, and the amount of newly unloaded crude oil and its related properties are weighted averaged with the amount and properties of the previous tank bottom oil, the amount and properties of residual oil in the oil transfer arm and pipeline to obtain the amount of mixed crude oil formed in the crude oil tank and related oil product characteristic parameters; 3) When crude oil is transported from the crude oil tank, batches are formed and numbered. The numbers are unique, and the amount of crude oil transported is recorded and the location of the oil section is tracked. When the oil section arrives at the detection node, the amount of crude oil is measured, and the characteristic parameters of the oil sampled at the node are analyzed; 4) Compare the crude oil quantity and oil product characteristic parameters calculated when the crude oil is delivered from the crude oil tank with the crude oil quantity and oil product characteristic parameters detected during the same period; The data after comparison in step (4) are considered to be consistent with the recorded crude oil tank output facts when the difference in oil product characteristic parameters is within the measurement analysis accuracy or error range and the difference in crude oil quantity is within the pipeline transmission loss amount; The method is used to verify the transit of single-variety oil from a single oil tanker, multiple-variety oil from a single oil tanker, and multiple-variety oil from multiple oil tankers.

2. The nuclear inspection method for multi-species crude oil transiting through a long-distance pipeline according to claim 1 is characterized in that When crude oil testing involves crude oil from different crude oil tanks and sampling at multiple time points, each set of data must be weighted averaged to obtain the final crude oil quantity and oil characteristic parameters.

3. The nuclear inspection method for multi-species crude oil transiting through a long-distance pipeline according to claim 1 is characterized in that When measuring the crude oil passing through the detection node in a certain time period to verify its source, the oil characteristic parameters and crude oil quantity sampled by all analysis nodes measured in the time period are weighted averaged and compared with the crude oil quantity output by all specific crude oil tanks recorded in the time period and the oil characteristic parameters formed by step (2) to obtain the difference.

4. The nuclear inspection method for multi-species crude oil transiting through a long-distance pipeline according to claim 1 is characterized in that Crude oil volume is net oil volume.

5. The method for nuclear inspection of multiple types of crude oil passing through a long-distance pipeline according to any one of claims 1 to 4, characterized in that The characteristic parameter of oil is density.

6. An operating system for executing the method for nuclear inspection of multiple types of crude oil passing through a long-distance pipeline as described in claim 1, characterized in that The system includes data detection, data collection, computer data operation and data result output.

7. The operating system according to claim 6, characterized in that The system detects crude oil data at the crude oil unloading port, crude oil data in the crude oil tank, and pipeline transmission data, and transmits them to the destination. After loading the original crude oil data, the system performs weighted average on the corresponding data, compares it with the destination detection node data, obtains data analysis results, and downloads the results.

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