Pigging feasibility evaluation method and device for class I oil pipeline

Abstract

The invention discloses a pigging feasibility evaluation method and device for an I-type oil pipeline. The method comprises the steps that multiple kinds of pipeline attribute information, related to oil transportation, of the oil pipeline are obtained; for each type of obtained pipeline attribute information, judging whether the pipeline attribute information meets a preset corresponding oil pipeline cleaning condition or not; and if all the pipeline attribute information meets the corresponding pipeline cleaning conditions of the oil pipeline, the oil pipeline is cleaned. According to the embodiment of the invention, various pigging conditions required to be met by pigging of the oil pipeline can be considered, and the oil pipeline is taken as a whole to provide the pigging feasibility evaluation method, so that the reliability of the pigging feasibility evaluation of the oil pipeline is improved.

Description

Technical Field

[0001] This document relates to risk assessment technologies, especially a method and device for evaluating the feasibility of pigging for Class I oil pipelines. Background Art

[0002] The scope of Class I oil pipelines includes oil pipelines with a maximum operating pressure ≥ 4 MPa and a nominal outer diameter of the pipeline ≥ 250 mm in the most recent 3 years, or oil pipelines with a maximum operating pressure ≥ 6.3 MPa and 100 mm ≤ nominal outer diameter of the pipeline < 250 mm in the most recent 3 years. For Class I oil pipelines, it is crucial to systematically and comprehensively identify their potential risks, establish an evaluation index and criterion system, and quickly analyze the risks and feasibility of pigging operations to guide pigging operations at the oilfield site and ensure the safety of pigging operations for crude oil transportation pipelines.

[0003] In related technologies, multiple evaluation criteria for pigging operation risks have been formulated.

[0004] However, these evaluation criteria only provide methods for risk evaluation from certain aspects, and do not give an evaluation method for pigging feasibility by taking the oil pipeline as a whole. Therefore, the evaluation reliability is low. Summary of the Invention

[0005] This application provides a method and device for evaluating the feasibility of pigging for Class I oil pipelines, which can give an evaluation method for pigging feasibility by taking the oil pipeline as a whole, thus improving the reliability of pigging feasibility evaluation.

[0006] On the one hand, this application provides a method for evaluating the feasibility of pigging for Class I oil pipelines, including:

[0007] Obtaining various pipeline attribute information related to oil transportation of the oil pipeline;

[0008] For each obtained pipeline attribute information, determining whether the pipeline attribute information meets the corresponding pigging conditions of the oil pipeline set in advance;

[0009] If all pipeline attribute information meets the corresponding pigging conditions of the oil pipeline, performing pigging on the oil pipeline.

[0010] On the other hand, this application provides a host in a surgical navigation system, including: a memory and a processor;

[0011] The memory is used to store an executable program;

[0012] The processor is used to read and execute the executable program to implement the method for evaluating the feasibility of pigging for Class I oil pipelines as described above.

[0013] Compared with the related technologies, the present application includes obtaining various pipeline attribute information related to oil transportation pipelines; for each obtained pipeline attribute information, determining whether the pipeline attribute information meets the corresponding pigging conditions of the oil transportation pipeline set in advance; if all the pipeline attribute information meets the corresponding pigging conditions of the oil transportation pipeline, pigging the oil transportation pipeline. The embodiments of the present application can take into account various pigging conditions that need to be met for pigging of oil transportation pipelines, and give an evaluation method for pigging feasibility with the oil transportation pipeline as a whole, thereby improving the reliability of the evaluation of pigging feasibility of oil transportation pipelines.

[0014] Other features and advantages of the present application will be described in the subsequent specification, and, in part, will become apparent from the specification, or will be understood by implementing the present application. Other advantages of the present application can be realized and obtained through the solutions described in the specification and the drawings.

[0015] Other features and advantages of the present application will be described in the subsequent specification, and, in part, will become apparent from the specification, or will be understood by implementing the present application. Other advantages of the present application can be realized and obtained through the solutions described in the specification and the drawings. Description of the Drawings

[0016] The drawings are used to provide an understanding of the technical solutions of the present application, and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solutions of the present application, and do not constitute a limitation to the technical solutions of the present application.

[0017] Figure 1 It is a schematic flowchart of a method for evaluating the pigging feasibility of a type-I oil transportation pipeline provided by an embodiment of the present application;

[0018] Figure 2a It is a schematic flowchart of another method for evaluating the pigging feasibility of a type-I oil transportation pipeline provided by an embodiment of the present application;

[0019] Figure 2b It is a schematic flowchart of yet another method for evaluating the pigging feasibility of a type-I oil transportation pipeline provided by an embodiment of the present application;

[0020] Figure 2c It is a schematic flowchart of yet another method for evaluating the pigging feasibility of a type-I oil transportation pipeline provided by an embodiment of the present application. Detailed Embodiments

[0021] This application describes multiple embodiments, but the description is exemplary rather than restrictive, and it will be apparent to those of ordinary skill in the art that there can be more embodiments and implementation solutions within the scope encompassed by the embodiments described in this application. Although many possible combinations of features are shown in the drawings and discussed in the detailed description, many other combinations of the disclosed features are also possible. Unless specifically restricted, any feature or element of any embodiment can be used in combination with any other feature or element in any other embodiment, or can replace any other feature or element in any other embodiment.

[0022] This application includes and contemplates combinations with features and elements known to those of ordinary skill in the art. The embodiments, features, and elements disclosed in this application can also be combined with any conventional features or elements to form unique inventive solutions defined by the claims. Any feature or element of any embodiment can also be combined with features or elements from other inventive solutions to form another unique inventive solution defined by the claims. Therefore, it should be understood that any feature shown and / or discussed in this application can be implemented alone or in any suitable combination. Thus, the embodiments are not limited except as defined by the appended claims and their equivalents. Additionally, various modifications and changes can be made within the scope of the appended claims.

[0023] Furthermore, in describing representative embodiments, the specification may have presented the method and / or process as a particular sequence of steps. However, to the extent that the method or process does not depend on the particular sequence of steps described herein, the method or process should not be limited to the particular sequence of steps described. As will be understood by those of ordinary skill in the art, other sequences of steps are possible. Therefore, the particular sequence of steps set forth in the specification should not be construed as a limitation on the claims. Additionally, the claims directed to the method and / or process should not be limited to performing their steps in the order written, as those skilled in the art can readily understand that these orders can vary and still remain within the spirit and scope of the embodiments of this application.

[0024] Pigging is an important task for oil and gas pipelines. Conventional pigging can ensure that oil and gas pipelines maintain their initial designed transportation capacity, while cleaning impurities and removing the internal corrosion environment. Special pigging can also meet the needs of subsequent in-line inspections. Class I pipelines are mainly the gathering and transportation oil and gas main lines under the jurisdiction of oil and gas fields with high pressure, large diameter, and relatively long transportation distances. Intelligent in-line inspection is an important inspection method to reduce the leakage rate and maintenance costs of Class I pipelines and maintain system integrity. The prerequisite for the above work is that the pipeline has the conditions for pigging and can successfully implement the first pigging and then achieve periodic pigging. However, the pigging operation of oil pipelines also faces many risks such as pipeline leakage, wax blockage, pig stuck, stagnation, and tracking failure. Especially for oil pipelines that have not been pigged for a long time, due to the unclear pipeline structure and internal conditions, it increases the uncertainty of pigging operation and the possibility of various accidents. In this regard, conducting a pigging feasibility analysis first, clarifying the pigging feasibility of Class I oil pipelines for the first pigging, and then carrying out targeted rectification or formulating corresponding safety guarantee measures can effectively solve the above problems.

[0025] At present, many standards for risk assessment have been formulated at home and abroad, but most of them are about the service safety and integrity management of gathering and transportation pipelines, such as standards API 1160, ASME B31.8S, GB / T 27512, GB / T 34346, etc. There is no targeted evaluation standard and method guidance for pigging operations, and the existing pigging specifications are relatively simple and cannot guide on-site personnel on how to predict risks and formulate reasonable safety guarantee measures when carrying out pigging operations.

[0026] The embodiment of this application provides a method for evaluating the pigging feasibility of Class I oil pipelines, including:

[0027] Step 101, obtain various pipeline attribute information related to oil transportation of the oil pipeline;

[0028] Step 102, for each obtained pipeline attribute information, determine whether the pipeline attribute information meets the corresponding pigging conditions of the oil pipeline set in advance;

[0029] Step 103, if all pipeline attribute information meets the corresponding pigging conditions of the oil pipeline, conduct pigging on the oil pipeline.

[0030] The method for evaluating the pigging feasibility of Class I oil pipelines provided by the embodiment of this application can take into account various pigging conditions that need to be met for pigging of oil pipelines, and give an evaluation method for pigging feasibility by taking the oil pipeline as a whole, thereby improving the reliability of the evaluation of pigging feasibility of oil pipelines.

[0031] In an exemplary instance, the pipeline attribute information includes: the attribute information of the oil transfer pump at the front end of the pipeline process, the size information of the pipeline, the attribute information of the loading equipment installed on the pipeline, the attribute information of the connection components installed in the pipeline, the repair operation history information of the pipeline, the usage type information of the pipeline, and the characteristic information of the oil products transported by the pipeline.

[0032] In an exemplary instance, the attribute information of the oil transfer pump at the front end of the pipeline process includes: the rated pressure of the oil transfer pump at the front end of the pipeline process;

[0033] The size information of the pipeline includes: the inner diameter of the pipeline;

[0034] The loading equipment installed on the pipeline includes: a non-full-bore valve and an insertion-type monitoring device. When the loading equipment is the insertion-type monitoring device, the attribute information of the insertion-type monitoring device includes: the adjustable insertion depth information and the detachable or not information of the insertion-type monitoring device;

[0035] The connection components installed in the pipeline include: a pig launcher and receiver accessory, a bent pipe fitting, and a tee pipe fitting. When the connection component is the pig launcher and receiver accessory, the attribute information of the pig launcher and receiver accessory includes: the barrel length and barrel wall thickness of the pig launcher and receiver; when the connection component is the bent pipe fitting, the attribute information of the bent pipe fitting includes: the curvature of the elbow part in the bent pipe fitting and the length of the straight pipe part in the bent pipe fitting; when the connection component is the tee pipe fitting, the attribute information of the tee pipe fitting includes: the opening diameter of the tee pipe fitting and the center distance between two adjacent tee pipe fittings;

[0036] The characteristic information of the oil products transported by the pipeline includes: the wax content of the transported oil products, the preset gas content in the transported oil products, and the transportation temperature of the transported oil products.

[0037] In an exemplary instance, when the oil transfer pump at the front end of the pipeline process is a centrifugal pump, the pigging condition of the oil pipeline corresponding to the attribute information of the centrifugal pump includes: the rated pressure of the centrifugal pump is greater than the preset pigging pressure.

[0038] In an exemplary instance, the inner diameter of the pipeline includes: the inner diameters of multiple different pipelines. The pigging condition of the oil pipeline corresponding to the size information of the pipeline includes:

[0039] The inner diameter of each pipeline is less than the preset inner diameter, and there is no diameter change between any two connected pipelines;

[0040] Among them, the determination that there is no diameter change between any two connected pipelines is made in the following way:

[0041] The difference between the inner diameters of the two pipelines is not greater than the preset threshold.

[0042] In an exemplary instance, when the loading device is the non-full-bore valve, the pigging condition of the oil pipeline corresponding to the attribute information of the non-full-bore valve is often not satisfied;

[0043] When the loading device is the plug-in monitoring device, the pigging conditions of the oil pipeline corresponding to the attribute information of the plug-in monitoring device include: determining that the adjustable insertion depth of the plug-in monitoring device is less than a preset depth according to the adjustable insertion depth information of the plug-in monitoring device, or determining that the plug-in monitoring device is detachable according to the detachable or non-detachable information of the plug-in monitoring device.

[0044] In an exemplary instance, when the connecting component arranged in the pipeline is the pig launcher and receiver accessory, the pigging conditions of the oil pipeline corresponding to the attribute information of the pig launcher and receiver accessory include: determining that the barrel length of the pig launcher and receiver is less than a first preset length according to the barrel length of the pig launcher and receiver, and determining that the barrel wall thickness of the pig launcher and receiver meets the preset requirements according to the barrel wall thickness of the pig launcher and receiver.

[0045] In an exemplary instance, when the connecting component arranged in the pipeline is the bent pipe fitting, the pigging conditions of the oil pipeline corresponding to the bent pipe fitting include: determining that the curvature of the elbow part in the bent pipe fitting is less than a preset curvature according to the curvature of the elbow part in the bent pipe fitting, and determining that the length of the straight pipe part in the bent pipe fitting is greater than a second preset length according to the length of the straight pipe part in the bent pipe fitting.

[0046] In an exemplary instance, when the connecting component arranged in the pipeline is the tee fitting, the pigging conditions of the oil pipeline corresponding to the tee fitting include: determining that the opening diameter of the tee fitting is not greater than a preset ratio of the outer diameter of the pipeline according to the opening diameter of the tee fitting, and determining that there is no double tee according to the center distance between two adjacent tee fittings;

[0047] Or,

[0048] Determining that the opening diameter of the tee fitting is not greater than a preset ratio of the outer diameter of the pipeline according to the opening diameter of the tee fitting, and determining that there is a double tee according to the center distance between two adjacent tee fittings, and the sum of the double tee spacing and a preset multiple of the inner diameter of the pipeline is less than the length of the pig;

[0049] Wherein, the double tee is determined by the following method:

[0050] The distance between the centers of two adjacent tees is not greater than 1.5D+(d1 + d2) / 2; where D is the outer diameter of the pipeline, and d1 and d2 are the opening diameters of two adjacent tees respectively.

[0051] In an exemplary instance, the pigging conditions of the oil pipeline corresponding to the repair operation history information of the pipeline include: determining, based on the repair operation history information of the pipeline, that there is no repair operation history that does not conform to the preset repair specification operation information in the oil pipeline.

[0052] In an exemplary instance, the pigging conditions of the oil pipeline corresponding to the usage type information of the pipeline include: determining, based on the usage type information of the pipeline, that the oil pipeline is not a gas-liquid mixed transportation pipeline.

[0053] In an exemplary instance, the pigging conditions of the oil pipeline corresponding to the characteristic information of the oil product transported by the pipeline include: determining, based on the wax content of the transported oil product, that the wax content of the transported oil product is less than the preset wax content threshold, and determining, based on the preset gas content in the transported oil product, that the content of the preset gas in the transported oil product does not reach the preset content threshold, and determining, based on the transportation temperature of the transported oil product, that the temperature of the transported oil product does not exceed the preset temperature.

[0054] The embodiment of the present application also provides a method for evaluating the pigging feasibility of a Class I oil pipeline. The corresponding flowchart can be as Figure 2a and 2b shown. Among them, Figure 2b is Figure 2a the process after determining that it is a gas-liquid mixed transportation pipeline in Figure 2c is Figure 2a the process after determining that it is waxy crude oil in . The method for evaluating the pigging feasibility of a Class I oil pipeline provided by the embodiment of the present application includes: The specific implementation steps are as follows;

[0055] Step 1: Collect the basic data of the Class I oil pipeline to be pigged

[0056] For the Class I oil pipeline to be pigged, collect basic information including pipeline size specifications, pipeline mileage and elevation data, information on pipeline fittings / valves / monitoring equipment / pig launchers and receivers / ball transfer cylinders along the line, pipeline operation parameters, pipeline medium composition, pipeline maintenance records, etc.

[0057] Step 2: Analyze the impact of the pipeline and its ancillary facilities on the pigging operation

[0058] (1) Determine the type of the oil transfer pump at the front end of the pipeline process and whether it can provide sufficient pigging power. If it is a centrifugal pump, it is required that its rated pressure meets the required pigging pressure; if it is a reciprocating pump, the rated pressure of the pump does not need to be considered. If the pressure does not meet the requirements, pigging is not possible.

[0059] (2) Determine whether the inner diameter of the pipeline exceeds the standard. When its wall thickness design meets the requirements for the wall thickness design of oil and gas pipelines and the requirements for selecting the strength coefficient in Table 8.3.5 in Article 8.1.3 of the Design Code for Oil and Gas Gathering and Transportation in Oilfields GB50350-2015, it does not affect pigging; when its design coefficient is greater than the design requirements, it means that the inner diameter exceeds the standard and special demonstration is required. During the demonstration, consider the passability of different types of pigs, calculate the passing capacity, and determine whether pigging can be carried out and the selection of pigs. The jurisdiction should, based on the different passing capacities of different pigs (for example, the passing capacity of polyurethane foam pigs is 50%-60%, and that of cup pigs is about 80%, and the specific passing capacity coefficient is provided by the pig manufacturer), combined with the specific pipe diameter, determine the passability of pigs in special cases through simulation calculation or test methods. Among them, for the structural problem of smooth transition, software such as Ansys can be used for simulation to judge its passing capacity; for the structural problems of sudden changes such as external inserts and steps, it is recommended that pipelines with a diameter of DN200 and above carry out traction tests, and for small-diameter pipelines with a diameter of DN200 and below, it is recommended to directly carry out hydrostatic tests. On this basis, consider whether the pigging risk and emergency measures are in place to determine whether pigging can be carried out.

[0060] (3) Judge whether there is a pipe diameter change. A pipe diameter change refers to a pipe section with a different diameter where the inner diameter deviation is ≥2.5%.

[0061] (4) Judge whether there are non-full-bore valves on the pigging line. If so, pigging cannot be carried out.

[0062] (5) Judge whether there are plug-in monitoring devices (whether there are plug-in devices such as thermometers, corrosion coupons, corrosion probes, and chemical injection points), excluding mechanical pigging indicators. If so, determine whether its depth can be adjusted or it can be removed in advance according to the product introduction. If not, special demonstration is required. During the special demonstration, the jurisdiction should, based on the different passing capacities of different pigs (for example, the passing capacity of polyurethane foam pigs is 50%-60%, and that of cup pigs is about 80%, and the specific passing capacity coefficient is provided by the pig manufacturer), combined with the specific pipe diameter, determine the passability of pigs in special cases through simulation calculation or test methods. Among them, for the structural problem of smooth transition, software such as Ansys can be used for simulation to judge its passing capacity; for the structural problems of sudden changes such as external inserts and steps, it is recommended that pipelines with a diameter of DN200 and above carry out traction tests, and for small-diameter pipelines with a diameter of DN200 and below, it is recommended to directly carry out hydrostatic tests. On this basis, consider whether the pigging risk and emergency measures are in place to determine whether pigging can be carried out.

[0063] (6) Determine whether the dimensions of the sending and receiving tube meet the product design requirements. Focus on whether the structural length of the sending and receiving tube can meet the requirements of the longest pig or detector, and whether the wall thickness of the small tube can meet the design requirements of the sending and receiving tube. For specific dimensional parameter requirements, please refer to the requirements for sending and receiving tubes in 4.1 of the standard GB / T 27699-2011 Technical Specifications for Internal Inspection of Steel Pipelines. If the requirements are not met, pigging is not allowed.

[0064] (7) Determine whether the elbow specifications meet the design requirements, whether there are elbows on the pigging pipeline, and whether the curvature radius of the pipe elbow can meet the requirements for the pig to pass smoothly. In addition, whether the length of the straight pipe section between adjacent elbows is greater than the outer diameter of the pipe. If there is an elbow or the curvature radius of the elbow cannot meet the requirements for the pig to pass smoothly, the pipe cannot be pigged.

[0065] (8) Determine whether the pipe meets the requirements. The tees on the pigging pipeline route should meet the requirements of 4.2 of GB / T27699-2011 Technical Specifications for Internal Inspection of Steel Pipelines, that is, when the diameter of the opening tee is greater than 30% of the outer diameter of the pipeline, a stopper or baffle should be installed. For specific requirements, refer to 4.2.1 and Appendix A. The axial length of the opening area of ​​the casing tee should not be greater than the outer diameter of the pipeline. If the requirements are not met, the pipeline cannot be pigged.

[0066] (9) Determine whether there is a double tee. That is, the distance between the centers of two adjacent tees (tees with opening diameters greater than 30% of the outer diameter of the pipeline) is ≤1.5D+(d1+d2) / 2. D is the outer diameter of the pipeline, and d1 and d2 are the opening diameters of adjacent tees. If it exists, a special demonstration is required. During the special demonstration, the length of the pipe cleaner is required to be ≥ the distance between the double tees + 1.25 times the inner diameter of the pipeline. If it is less than , Ansys software is required to perform modeling and calculation to comprehensively determine whether the pipeline can be cleaned and whether the selection of the pipe cleaner is feasible.

[0067] (10) Determine whether there is improper emergency repair and plugging. Improper emergency repair and plugging methods refer to failure to perform emergency repairs in accordance with the requirements of the standard SY / T7033-2016 Technical Specifications for Emergency Repair of Failed Steel Oil and Gas Pipelines and the standard SY / T 6150 Technical Regulations for Steel Pipeline Plugging, and problems such as foreign objects inserted into the pipeline and improper return of materials during pressure plugging.

[0068] (11) Determine whether it is a gas-liquid mixed transmission pipeline. If it is a gas-liquid mixed transmission pipeline, it is necessary to determine whether slug flow will occur, whether the instantaneous flow during the cleaning process exceeds the processing capacity of the downstream processing equipment, and whether targeted safety measures have been formulated. The detailed determination is as follows:

[0069] (12) First, determine whether slug flow occurs. When making the determination, the flow regime of the medium in the pipeline can be calculated according to semi-empirical multiphase flow prediction models or multiphase flow calculation software such as Pipephase, Pipesys, Pipeflo, Pipesim, Tacite, OLGA, etc., to determine whether slug flow exists.

[0070] a. Judge whether the instantaneous cleaning output exceeds the processing capacity of downstream facilities.

[0071] b. Once it exceeds the processing capacity of downstream equipment, check whether there are conditions for taking countermeasures such as opening a bypass line and arranging temporary treatment facilities. If not, pigging is not allowed.

[0072] (13) Determine whether it is waxy crude oil. Generally speaking, the wax content of waxy crude oil is above 2.5%. If it is waxy crude oil, it is necessary to determine whether there is a risk of wax deposition and whether wax deposition exists. If so, a special demonstration is required. Specifically as follows:

[0073] a. First, it should be determined whether there is a risk of wax deposition. When the minimum inlet temperature of the crude oil pipeline is not higher than 3°C above the pour point of the pipeline-transported crude oil, there is a risk of wax deposition. For modified crude oil, its minimum inlet temperature should not be lower than the safe transportation temperature obtained according to the results of the flow safety evaluation.

[0074] b. Determine whether wax deposition actually exists in the on-site pipeline. Regarding whether wax deposition exists in the pipeline, on the one hand, it can be identified through on-site practice. For example, check the daily maintenance records to determine whether there is wax deposition in the pipeline; check whether there is wax deposition in the pipelines in the standby heating furnace; check whether there is wax deposition in the bypass pipeline; check the pigging process to determine whether there is wax deposition in the pigging barrel. On the other hand, relevant units can be entrusted to carry out experimental demonstrations to determine whether there is wax deposition.

[0075] c. When carrying out a special demonstration, determine whether increasing the operating temperature and throughput of the crude oil pipeline 3 - 5 days before pigging to ensure that the inlet temperature of the crude oil is 3 - 5°C higher than the pour point of the crude oil can reduce the degree of pipeline wax deposition. At the same time, whether corresponding emergency measures have been formulated for potential wax deposition risks.

[0076] (14) Determine whether the pipeline contains CO2 and H2S. If the CO2 content is higher than 3%, it is a CO2-containing pipeline. If it is a CO2 / H2S-containing pipeline, it should be determined whether it will cause serious aging of non-metallic materials. When PCO2≥1.5MPa or PH2S≥1.2MPa, the anti-swelling performance and anti-sulfuration performance of rubber non-metallic materials in the medium should be evaluated.

[0077] (15) Determine whether it is a high-temperature pipeline. A crude oil pipeline with an operating temperature above 60°C is a high-temperature pipeline. If it is a high-temperature pipeline, it should be determined whether it exceeds the recommended operating temperature range of the pig. Specifically, refer to the regulations in Clause 9.1.1 of the standard QS / Y 05262-2019 Technical Conditions for Mechanical Pigs. The operating temperature of a mechanical pig is between -20°C and 75°C, and it is not easy to exceed this temperature range; for a polyurethane foam pig, the temperature is not easy to be higher than 90°C. If it exceeds, a special demonstration needs to be carried out. During the special demonstration, for the situation where it exceeds the conventional operating range of the pig, on the one hand, it is recommended to use heat-resistant cup seals; on the other hand, it is recommended to adopt the method of transporting with reduced temperature to reduce the influence of temperature on the operating stability of the pig during pigging.

[0078] If the determination results of the above steps all meet the requirements, pigging can be carried out. However, corresponding safety guarantee measures need to be formulated for potential risks.

[0079] In the above feasibility evaluation method, the annotation content of some processes involved is shown in Table 1.

[0080] Table 1

[0081]

[0082]

[0083]

[0084]

[0085] The pigging feasibility evaluation method for Class I oil pipelines provided by the embodiments of the present application fills the gap in this field. It can analyze the feasibility of pigging with a pig for the first pigging of Class I oil pipelines, identify and determine potential risks and their influencing factors, determine whether pigging can be carried out and the necessary supporting safety guarantee measures. At the same time, the reasons for special demonstration and non-piggable are also given. This method fully considers the complexity of pigging operations and the convenience of on-site personnel analysis and evaluation, and gives the basis for determination of each step to the greatest extent. When special demonstration is required, the idea of special demonstration is given; when in-depth analysis and determination are required, the ideas of analysis, calculation and test are given. This method objectively and accurately analyzes the feasibility and risk level of pigging with a pig for the first pigging of Class I oil pipelines. This method is simple, convenient, easy to operate on-site, and can quickly give the feasibility analysis result.

[0086] The embodiments of the present application also provide the following implementation cases to illustrate the provided pigging feasibility evaluation method for Class I oil pipelines.

[0087] Implementation Case 1

[0088] (1) Collection and arrangement of basic information of oil pipelines

[0089] According to the pigging feasibility evaluation method, for Class I oil pipelines to be pigged, collect basic information including pipeline size specifications, pipeline mileage and elevation data, information of pipe fittings / valves / monitoring equipment / pig launchers and receivers / ball transfer cylinders along the line, pipeline operation parameters, pipeline medium composition, pipeline maintenance records, etc. Arrange the collected information. The specific information is shown in Table 2.

[0090] Table 2

[0091]

[0092]

[0093]

[0094] (2) Processing of key parameters

[0095] According to the pigging feasibility evaluation method, sort out the specific parameters of the oil pipelines in Table 2 and extract the key influencing parameters, as shown in Table 3.

[0096] Table 3

[0097]

[0098]

[0099] (3) Judgment of evaluation indicators

[0100] According to the pigging feasibility evaluation method and the key parameters of the oil pipelines in Table 3, judge each evaluation indicator according to the notes. The results are shown in Table 4.

[0101] Table 4

[0102]

[0103] (4) Feasibility analysis

[0104] According to Figure 2a 、 2b 、the feasibility analysis process in 2c, combined with the evaluation indicators in Table 4, conduct a pigging feasibility analysis on this pipeline. The results show that this pipeline can be pigged.

[0105] Implementation case 2

[0106] (1) Collection and arrangement of pipeline basic information

[0107] According to the pigging feasibility evaluation method, collect the basic information of Class I oil pipelines to be pigged and arrange it. The specific information is shown in Table 5.

[0108] Table 5

[0109]

[0110]

[0111]

[0112] (2) Processing of key parameters

[0113] According to the pigging feasibility evaluation method, the specific parameters of the oil pipeline in Table 5 are sorted out to extract the key influencing parameters, as shown in Table 6.

[0114] Table 6

[0115]

[0116]

[0117] (3) Judgment of evaluation indicators

[0118] According to the pigging feasibility evaluation method and the key parameters of the oil pipeline in Table 6, and according to the notes, each evaluation indicator is judged, and the results are shown in Table 7.

[0119] Table 7

[0120]

[0121]

[0122] (4) Feasibility analysis

[0123] According to Figure 2a 、 2b 、the feasibility analysis process in 2c, combined with the evaluation indicators in Table 7, it is unknown whether there are improper operations during the double-block and double-seal line modification operation of the pipeline. At the same time, the operating temperature of the pipeline is high, exceeding the temperature resistance of conventional pigs, and special demonstration is required. During the special demonstration, verify the modification procedure and details with the personnel who carried out the parameter modification construction at that time, and conduct excavation for detection if necessary. If there are sudden structural problems such as external inserts and steps, it is recommended to carry out a tension test to determine whether the repair and modification location affects pigging. At the same time, it is necessary to find a pig with stronger temperature resistance.

[0124] Implementation case 3

[0125] (1) Collection and collation of pipeline basic data

[0126] According to the pigging feasibility evaluation method, collect the basic data of the Class I oil pipeline to be pigged and sort it out. The specific information is shown in Table 8.

[0127] Table 8

[0128]

[0129]

[0130]

[0131]

[0132] (2) Key parameters

[0133] According to the pigging feasibility evaluation method, the specific parameters of the oil pipeline in Table 8 are sorted out, and the key influencing parameters are refined, as shown in Table 9.

[0134] Table 9

[0135]

[0136]

[0137]

[0138] (3) Judgment of evaluation indicators

[0139] According to the pigging feasibility evaluation method and the key parameters of the oil pipeline in Table 9, and according to the notes, each evaluation indicator is judged, and the results are shown in Table 10.

[0140] Table 10

[0141]

[0142]

[0143] (4) Feasibility analysis

[0144] According to Figure 2a 、 2b 、the feasibility analysis process in 2c, combined with the evaluation indicators in Table 10, it can be seen that there are improper operations during the multiple maintenance and renovation operations of this pipeline, and there is a drag reducer dosing device on this pipeline, and special demonstration is required. During the special demonstration, verify the renovation procedures and renovation details with the personnel who carried out the parameter renovation construction at that time, and conduct excavation for inspection if necessary. If there are sudden structural problems such as external inserts and steps, it is recommended to carry out a tension test to determine whether the renovation location affects pigging.

[0145] The pigging feasibility assessment method for Class I oil pipelines provided by the embodiments of the present application clarifies the potential risks and their influencing factors in each link of the pigging operation of the oil pipeline on the basis of identifying the risks of the pigging operation of Class I oil pipelines and the corresponding safety guarantee measures, classifies various risks, and gives different analysis results. The influencing factors are connected in series by means of a flowchart, and annotations are made for each influencing factor and its judgment criteria to facilitate users to more clearly and comprehensively understand how to use the feasibility assessment method. This method can be used to analyze the feasibility of using a pigging tool for pigging operation of a Class I oil pipeline during the first pigging, give the reasons for non-piggable conditions, the places that require special demonstration, or the necessary safety guarantee measures to be formulated during pigging, so as to ensure the safe and smooth completion of the pigging operation to the greatest extent.

[0146] The embodiments of the present application further provide a pigging feasibility assessment device for Class I oil pipelines, including a memory and a processor;

[0147] The memory is used to store executable programs;

[0148] The processor is used to read and execute the executable program to implement the pigging feasibility assessment method for Class I oil pipelines described in any of the above embodiments.

[0149] The pigging feasibility assessment device for Class I oil pipelines provided by the embodiments of the present application can take into account various pigging conditions that need to be met for pigging of the oil pipeline, and give an assessment method for pigging feasibility by taking the oil pipeline as a whole, thereby improving the reliability of the pigging feasibility assessment of the oil pipeline.

[0150] Those of ordinary skill in the art will understand that all or some of the steps in the methods disclosed above, and the functional modules / units in the systems and devices, can be implemented as software, firmware, hardware, and appropriate combinations thereof. In the hardware implementation, the division of the functional modules / units mentioned above does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may be executed by several physical components in cooperation. Some or all of the components may be implemented as software executed by a processor, such as a digital signal processor or a microprocessor, or implemented as hardware, or implemented as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on a computer-readable medium, which can include a computer storage medium (or non-transitory medium) and a communication medium (or transitory medium). As is well known to those of ordinary skill in the art, the term computer storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information, such as computer-readable instructions, data structures, program modules, or other data. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disk (DVD) or other optical disk storage, magnetic cassettes, tapes, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store the desired information and can be accessed by a computer. In addition, it is well known to those of ordinary skill in the art that communication media typically includes computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transmission mechanism, and can include any information delivery medium.

Claims

1. A method for evaluating the feasibility of pigging for Class I oil pipelines, characterized in that, it includes: Obtaining various pipeline attribute information related to oil transportation of the oil pipeline; For each obtained pipeline attribute information, judging whether the pipeline attribute information meets the corresponding pigging conditions of the oil pipeline set in advance; If all pipeline attribute information meets the corresponding pigging conditions of the oil pipeline, pigging is carried out on the oil pipeline.

2. The method according to claim 1, characterized in that, the pipeline attribute information includes: attribute information of the oil pump at the front end of the pipeline process, size information of the pipeline, attribute information of the loading equipment set on the pipeline, attribute information of the connecting components set in the pipeline, repair operation history information of the pipeline, use type information of the pipeline, and characteristic information of the oil transported by the pipeline.

3. The method according to claim 2, characterized in that, the attribute information of the oil pump at the front end of the pipeline process includes: the rated pressure of the oil pump at the front end of the pipeline process; the size information of the pipeline includes: the inner diameter of the pipeline; the loading equipment set on the pipeline includes: non-full-bore valves and plug-in monitoring equipment. When the loading equipment is the plug-in monitoring equipment, the attribute information of the plug-in monitoring equipment includes: the insertable adjustable depth information and the detachable or not information of the plug-in monitoring equipment; the connecting components set in the pipeline includes: pig launcher and receiver accessories, bent pipe fittings, tee pipe fittings. When the connecting component is the pig launcher and receiver accessories, the attribute information of the pig launcher and receiver accessories includes: the barrel length and barrel wall thickness of the pig launcher and receiver. When the connecting component is the bent pipe fittings, the attribute information of the bent pipe fittings includes: the curvature of the elbow part in the bent pipe fittings and the length of the straight pipe part in the bent pipe fittings. When the connecting component is the tee pipe fittings, the attribute information of the tee pipe fittings includes: the opening diameter of the tee pipe fittings and the center distance between two adjacent tee pipe fittings; the characteristic information of the oil transported by the pipeline includes: the wax content of the transported oil, the preset gas content in the transported oil, and the transportation temperature of the transported oil.

4. The method according to claim 3, characterized in that, when the oil pump at the front end of the pipeline process is a centrifugal pump, the pigging conditions of the oil pipeline corresponding to the attribute information of the centrifugal pump include: the rated pressure of the centrifugal pump is greater than the preset pigging pressure.

5. The method according to claim 3, characterized in that, the inner diameter of the pipeline includes: the inner diameters of multiple different pipelines, and the pigging conditions of the oil pipeline corresponding to the size information of the pipeline include: the inner diameter of each pipeline is less than the preset inner diameter, and there is no diameter change between every two connected pipelines; wherein, the determination that there is no diameter change between every two connected pipelines is determined by the following method: the difference between the inner diameters of the two pipelines is not greater than the preset threshold.

6. The method according to claim 3, characterized in that, when the loading equipment is the non-full-bore valve, the pigging conditions of the oil pipeline corresponding to the attribute information of the non-full-bore valve are usually not met; When the loading device is the plug-in monitoring device, the pigging conditions of the oil pipeline corresponding to the attribute information of the plug-in monitoring device include: determining that the adjustable insertion depth of the plug-in monitoring device is less than a preset depth according to the adjustable insertion depth information of the plug-in monitoring device, or determining that the plug-in monitoring device is detachable according to the detachable or non-detachable information of the plug-in monitoring device.

7. The method according to claim 3, wherein, when the connecting component arranged in the pipeline is the pig launcher and receiver accessory, the pigging conditions of the oil pipeline corresponding to the attribute information of the pig launcher and receiver accessory include: determining that the barrel length of the pig launcher and receiver is less than a first preset length according to the barrel length of the pig launcher and receiver, and determining that the wall thickness of the barrel of the pig launcher and receiver meets the preset requirements according to the wall thickness of the barrel of the pig launcher and receiver; when the connecting component arranged in the pipeline is the bending pipe fitting, the pigging conditions of the oil pipeline corresponding to the bending pipe fitting include: determining that the curvature of the elbow part in the bending pipe fitting is less than a preset curvature according to the curvature of the elbow part in the bending pipe fitting, and determining that the length of the straight pipe part in the bending pipe fitting is greater than a second preset length according to the length of the straight pipe part in the bending pipe fitting; when the connecting component arranged in the pipeline is the tee pipe fitting, the pigging conditions of the oil pipeline corresponding to the tee pipe fitting include: determining that the opening diameter of the tee pipe fitting is not greater than a preset ratio of the outer diameter of the pipeline according to the opening diameter of the tee pipe fitting, and determining that there is no double tee according to the center distance between two adjacent tee pipe fittings; or, determining that the opening diameter of the tee pipe fitting is not greater than a preset ratio of the outer diameter of the pipeline according to the opening diameter of the tee pipe fitting, and determining that there is a double tee according to the center distance between two adjacent tee pipe fittings, and the sum of the double tee spacing and the preset multiple of the inner diameter of the pipeline is less than the length of the pig; wherein, the double tee is determined by the following method: the distance between the centers of two adjacent tees is not greater than 1.5D+(d1+d2) / 2; where D is the outer diameter of the pipeline, and d1 and d2 are the opening diameters of two adjacent tees respectively.

8. The method according to claim 3, wherein, the pigging conditions of the oil pipeline corresponding to the repair operation history information of the pipeline include: determining that there is no repair operation history that does not conform to the preset repair specification information according to the repair operation history information of the pipeline; the pigging conditions of the oil pipeline corresponding to the use type information of the pipeline include: determining that the oil pipeline is not a gas-liquid mixed transportation pipeline according to the use type information of the pipeline.

9. The method according to claim 3, wherein, the pigging conditions of the oil pipeline corresponding to the characteristic information of the oil transported by the pipeline include: determining that the wax content of the oil transported is less than a preset wax content threshold according to the wax content of the oil transported, and determining that the content of the preset gas in the oil transported does not reach the preset content threshold according to the preset gas content in the oil transported, and determining that the temperature of the oil transported does not exceed the preset temperature according to the transportation temperature of the oil transported.

10. A pigging feasibility evaluation device for Class I oil pipelines, comprising: a memory and a processor, the memory being used to store an executable program; the processor being used to read and execute the executable program to implement the pigging feasibility evaluation method for Class I oil pipelines according to any one of claims 1-9.

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