Method and apparatus for determining elbow passage count for drag-type internal detector

Abstract

The present application provides a method and apparatus for determining an elbow passage count for a drag-type internal detector. The method comprises the following steps: acquiring a starting force of an internal detector; acquiring a maximum bearable tension of a traction rope; and, on the basis of the starting force of the internal detector and the maximum bearable tension of the traction rope, acquiring an elbow passage count for the internal detector. Thus, the number of pipe elbows which the drag-type internal detector can pass through is accurately evaluated, helping to prevent the internal detector from experiencing blockage, and improving the safety of internal pipeline detection.

Description

Method and device for determining the number of bends through which a towed internal detector passes

[0001] The present application claims priority to the Chinese patent application No. 202410465674.2, filed on April 17, 2024, and entitled "Method and device for determining the number of bends through which a towed internal detector passes", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application belongs to the technical field of pipeline detection, and particularly relates to a method and device for determining the number of bends through which a towed internal detector passes. BACKGROUND

[0003] With the continuous increase of oil and gas exploration and development efforts, a huge oil and gas gathering and transportation pipeline network has been built. Unlike long-distance pipelines, the oil and gas gathering and transportation pipeline network transports complex media, including H2S, CO2, O2, and other corrosive gases, SRB bacteria, Cl - and other strong corrosive liquids, making the internal corrosion of the oil and gas gathering and transportation pipeline network particularly serious. Scientifically, efficiently, and economically assessing the internal corrosion state of the oil and gas gathering and transportation pipeline and timely taking internal corrosion prevention and control measures are important means to improve the intrinsic safety of the oil and gas gathering and transportation pipeline.

[0004] Currently, the most effective means for evaluating the state of the oil and gas gathering and transportation pipeline body is internal detection, especially the magnetic flux leakage internal detection technology, which has been widely used in the field of oil and gas pipeline detection and evaluation due to its high detection accuracy. Conventional magnetic flux leakage internal detectors are mainly driven by differential pressure with a skin bowl. Under the action of the electromagnetic field and the pipe internal friction, the driving differential pressure is generally high, especially for small diameter pipelines below DN150. For oil and gas field gathering and transportation pipelines, more than 70% of the pipelines are small diameter pipelines below DN150, and the operating pressure is low (generally lower than 0.5Mpa), and the flow rate is low, which is difficult to meet the requirements of conventional internal detector differential pressure driving. To support internal detection operations for low-pressure low-flow small-diameter pipelines, the industry has gradually developed towed magnetic flux leakage internal detectors, which use rope tow driving instead of skin bowl differential pressure driving.

[0005] During the rope tow operation, the rope is subjected to the friction between the internal detector and the pipe wall and the friction between the rope and the pipe bend. As the number of pipe bends increases, the tow force borne by the rope increases. Once the tow force exceeds the allowable tension of the rope, the rope will break, causing the internal detector to be blocked, and thus the internal detection operation cannot be carried out. Therefore, accurately assessing the number of pipe bends through which a towed internal detector can pass is crucial for guiding internal detection.

[0006] Currently, there is no safe and reliable method for determining the number of bends through which a towed internal detector passes, which poses a serious safety hazard to on-site internal detection operations. SUMMARY

[0007] The application discloses a method and device for determining the number of bends through which a towed internal detector can pass, and aims to solve the problem that the number of bends through which a towed internal detector can pass cannot be accurately evaluated in the prior art, so as to prevent the towed internal detector from being stuck.

[0008] In a first aspect, the application provides a method for determining the number of bends through which a towed internal detector can pass, comprising the following steps:

[0009] obtaining the starting force of the internal detector;

[0010] obtaining the maximum bearable tension of the pull rope;

[0011] obtaining the number of bends through which the internal detector can pass according to the starting force of the internal detector and the maximum bearable tension of the pull rope.

[0012] Further, before obtaining the number of bends through which the internal detector can pass, the method further comprises: obtaining the driving coefficient of the internal detector;

[0013] obtaining the number of bends through which the internal detector can pass according to the starting force of the internal detector, the maximum bearable tension of the pull rope and the driving coefficient of the internal detector.

[0014] Further, when the friction coefficient between the pull rope and the pipeline to be detected is not greater than 0.1, the number of bends through which the internal detector can pass is calculated by formula (1):

[0015] In the formula, N r is the number of bends through which the internal detector can pass, the unit is piece; F is the maximum bearable tension of the pull rope, the unit is kg; F0 is the starting force of the internal detector, the unit is kg; k1 is the first driving coefficient of the internal detector, k1 is 1-2; k2 is the second driving coefficient of the internal detector, k2 is 0.1-0.3.

[0016] Further, when the friction coefficient between the pull rope and the pipeline to be detected is greater than 0.1, the number of bends through which the internal detector can pass is calculated by formula (2):

[0017] In the formula, N ris the number of the inner detector elbow passes through, unit: pieces; F is the maximum bearable tension of the pulling rope, unit: kg; F0 is the starting force of the inner detector, unit: kg; k3 is the third driving coefficient of the inner detector, k3 is 0.1-3; k4 is the fourth driving coefficient of the inner detector, k3 is 6-8; k5 is the fifth driving coefficient of the inner detector, k5 is 16-17.

[0018] Further, the driving coefficient of the inner detector is obtained by the following steps:

[0019] The inner detector is dragged through N groups of experimental pipelines by the pulling rope respectively, and N groups of pulling forces F of the pulling rope are recorded i ; wherein, N is greater than or equal to 2; the experimental pipeline includes a plurality of experimental straight pipes and experimental elbows which are alternately connected, the size of the experimental straight pipe is the same as that of the straight pipe in the pipeline to be measured, and the size of the experimental elbow is the same as that of the elbow in the pipeline to be measured; and the number of the experimental straight pipe and the experimental elbow of each group of the experimental pipeline is one more than that of the previous group of the experimental pipeline;

[0020] According to N groups of N i -F i Data, based on Kriging model, the driving coefficient of the inner detector is fitted.

[0021] Further, when the friction coefficient of the pulling rope and the experimental pipeline is not greater than 0.1, the fitted driving coefficient of the inner detector includes the first driving coefficient of the inner detector and the second driving coefficient of the inner detector.

[0022] Further, when the friction coefficient of the pulling rope and the experimental pipeline is greater than 0.1, the fitted driving coefficient of the inner detector includes the third driving coefficient of the inner detector, the fourth driving coefficient of the inner detector and the fifth driving coefficient of the inner detector.

[0023] Further, when the number of the inner detector elbow passes is not less than the actual number of elbows of the pipeline to be measured, the pulling rope is used to drag the inner detector, and the inner detector passes through the pipeline to be measured.

[0024] In the second aspect, the application provides a detection device for the number of inner detector elbow passes, which is used for the determination method in the first aspect, and includes:

[0025] The first acquisition module is used to acquire the starting force of the inner detector;

[0026] The second acquisition module is used to acquire the maximum bearable tension of the pulling rope;

[0027] a third obtaining module, configured to obtain the number of bends through which the inner detector can pass according to the starting force of the inner detector and the maximum bearable tension of the pulling rope.

[0028] In a third aspect, the present application provides an electronic device, comprising a memory and a processor.

[0029] The memory stores computer-executed instructions.

[0030] The processor executes the computer-executed instructions stored in the memory, so that the processor executes the determination method according to the first aspect.

[0031] In a fourth aspect, the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer-executed instructions, and the computer-executed instructions are executed by a processor to implement the determination method according to the first aspect.

[0032] In a fifth aspect, the present application provides a computer program product, comprising a computer program, wherein the computer program is executed by a processor to implement the determination method according to the first aspect.

[0033] The present application provides a determination method for the number of bends through which a dragging type inner detector can pass, the starting force of the inner detector is obtained, the maximum bearable tension of the pulling rope is obtained, and the number of bends through which the inner detector can pass is obtained according to the starting force of the inner detector and the maximum bearable tension of the pulling rope, so that the number of bends through which the dragging type inner detector can pass is accurately evaluated, the phenomenon of the inner detector being blocked is prevented, and the safety of pipeline detection is improved. BRIEF DESCRIPTION OF DRAWINGS

[0034] FIG. 1 is a flowchart of a determination method for the number of bends through which a dragging type inner detector can pass according to the present application;

[0035] FIG. 2 is a structural schematic diagram of a determination device for the number of bends through which a dragging type inner detector can pass according to the present application;

[0036] FIG. 3 is a structural schematic diagram of an electronic device according to the present application. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely in combination with the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0038] In a first aspect, the present application provides a method for determining the number of bends through which a towed internal detector can pass, as shown in FIG. 1, the method comprises the following steps:

[0039] S01: obtaining the starting force of the internal detector;

[0040] S02: obtaining the maximum bearable tension of the pull rope;

[0041] S03: obtaining the number of bends through which the internal detector can pass according to the starting force of the internal detector and the maximum bearable tension of the pull rope.

[0042] The starting force of the internal detector can be obtained according to the design data of the internal detector, and the maximum bearable tension of the pull rope can be obtained according to the design parameters of the pull rope. It can be understood that the pull rope should be made of materials with small density, small hardness, large strength and good wear resistance, which is beneficial to the complete and smooth completion of the internal detection of the pipeline by the towed internal detector. The present application does not limit the type of internal detector, which can be a magnetic flux leakage internal detector and an eddy current internal detector, etc. Any internal detector that can detect the pipeline to obtain information such as the state of the pipeline to be detected, including damage type, damage location, and damage size, etc. can be used.

[0043] Specifically, the starting force of the internal detector is obtained, the maximum bearable tension of the pull rope is obtained, and the number of bends through which the internal detector can pass is obtained according to the starting force of the internal detector and the maximum bearable tension of the pull rope.

[0044] The present application provides a method for determining the number of bends through which a towed internal detector can pass, which can obtain the number of bends through which the internal detector can pass according to the starting force of the internal detector and the maximum bearable tension of the pull rope, thereby accurately evaluating the number of bends through which the towed internal detector can pass, which is beneficial to preventing the internal detector from being blocked and improving the safety of pipeline internal detection.

[0045] Further, before obtaining the number of bends through which the internal detector can pass, the method further comprises: obtaining the driving coefficient of the internal detector.

[0046] The number of bends through which the internal detector can pass is obtained according to the starting force of the internal detector, the maximum bearable tension of the pull rope, and the driving coefficient of the internal detector.

[0047] It can be understood that the driving coefficient of the internal detector is related to factors such as the friction between the pull rope and the pipeline to be detected and the number of bends of the pipeline to be detected. The number of bends through which the internal detector can pass is obtained according to the starting force of the internal detector, the maximum bearable tension of the pull rope, and the driving coefficient of the internal detector, which can further improve the accuracy and safety of the determination method.

[0048] In a specific embodiment, when the friction coefficient between the pulling rope and the pipeline to be tested is not greater than 0.1, the number of elbow passes of the inner detector is calculated by formula (1):

[0049] Where N r is the number of elbows passed by the internal detector, in pieces; F is the maximum tolerable tension of the pulling rope, in kg; F0 is the starting force of the internal detector, in kg; k1 is the first driving coefficient of the internal detector, k1 is 1-2; k2 is the second driving coefficient of the internal detector, k2 is 0.1-0.3;

[0050] In another specific embodiment, when the friction coefficient between the pulling rope and the pipeline to be tested is greater than 0.1, the number of elbow passes of the inner detector is calculated by formula (2):

[0051] Where N r is the number of elbows passing through the internal detector, in pieces; F is the maximum tensile force that the pulling rope can withstand, in kg; F0 is the starting force of the internal detector, in kg; k3 is the third driving coefficient of the internal detector, k3 is 0.1-3; k4 is the fourth driving coefficient of the internal detector, k4 is 6-8; k5 is the fifth driving coefficient of the internal detector, k5 is 16-17.

[0052] The friction coefficient between the pulling rope and the pipe to be tested can be obtained by data query or instrument measurement, and the friction coefficient between the pulling rope and the pipe to be tested can be reduced by applying butter to the pulling rope.

[0053] When the friction coefficient between the pulling rope and the pipeline to be tested is not greater than 0.1, the number of passes through the inner detector elbow is calculated by formula (1). At this time, the driving coefficient of the inner detector includes a first driving coefficient and a second driving coefficient. The first driving coefficient k1 of the inner detector is 1-2, and the second driving coefficient k2 of the inner detector is 0.1-0.3. The driving coefficient of the inner detector can take any value within a given range. In the above range, it can better match the maximum tolerable tension of the pulling rope. The number of passes through the inner detector elbow can be further accurately calculated by formula (1);

[0054] When the friction coefficient between the pulling rope and the pipeline to be detected is greater than 0.1, the number of the inner detector elbow passes is calculated by formula (2), at this time, the driving coefficient of the inner detector includes the third driving coefficient, the fourth driving coefficient and the fifth driving coefficient, the third driving coefficient k3 of the inner detector is 1-3, the fourth driving coefficient k4 of the inner detector is 6-8, and the fifth driving coefficient k5 of the inner detector is 16-17, the driving coefficient of the above-mentioned inner detector can be arbitrarily taken within a given range, and in the above-mentioned range, the maximum bearing tension of the pulling rope can be better matched, and the number of the inner detector elbow passes can be more accurately calculated by formula (2); the method for determining the number of the inner detector elbow passes provided by the application can further improve the accuracy and safety of the determination method by considering the actual situation among the inner detector, the pulling rope and the pipeline to be detected.

[0055] In order to further accurately determine the driving coefficient of the inner detector and make the determination method provided by the application more objective and accurate, the driving coefficient of the inner detector is obtained by the following steps:

[0056] The inner detector is pulled by the pulling rope to pass through N groups of experimental pipelines respectively, and N groups of pulling forces F i of the pulling rope are recorded, wherein N is greater than or equal to 2; the experimental pipeline includes a plurality of experimental straight pipes and experimental elbows which are alternately connected, the size of the experimental straight pipe is the same as that of the straight pipe in the pipeline to be detected, and the size of the experimental elbow is the same as that of the elbow in the pipeline to be detected; and the number of the experimental straight pipe and the experimental elbow of each group of experimental pipelines is one more than that of the experimental straight pipe and the experimental elbow of the previous group of experimental pipelines.

[0057] According to the N groups of N i -F i data, the driving coefficient of the inner detector is fitted based on the Kriging model.

[0058] The application does not limit the source of the experimental pipeline, and any experimental pipeline including a plurality of experimental straight pipes and experimental elbows which are alternately connected, and the size of the experimental straight pipe being the same as that of the straight pipe in the pipeline to be detected and the size of the experimental elbow being the same as that of the elbow in the pipeline to be detected can be used; specifically, the experimental pipeline can be commercially available, or N straight pipes and elbows with the same size as the pipeline to be detected can be purchased, and a straight pipe and an elbow are sequentially and alternately welded to form an experimental pipeline; alternatively, a load with the same starting force as the inner detector can be used to replace the inner detector to obtain the driving coefficient of the inner detector; the pulling force can be obtained by connecting a spring scale for measuring the pulling force with the pulling rope.

[0059] In a specific embodiment, one end of the pulling rope is connected with the inner detector, and the other end is connected with the spring scale; the inner detector is pulled by the pulling rope to pass through N groups of experimental pipelines respectively, and N groups of pulling forces F i; wherein N is greater than or equal to 2; the experimental pipeline includes a plurality of experimental straight pipes and experimental bends which are alternately connected to each other, the experimental straight pipe has the same size as the straight pipe in the pipeline to be detected, and the experimental bend has the same size as the bend in the pipeline to be detected; and the number of experimental straight pipes and experimental bends of each group of experimental pipelines is one more than that of the previous group of experimental pipelines.

[0060] It can be understood that the N groups of experimental pipelines include N bends, and N groups of N i -F i data; based on the N groups of N i -F i data, a more accurate unique driving coefficient of the internal detector is fitted based on the Kriging model; through the above steps, the driving coefficient of the internal detector is further refined, and the accuracy of the pipeline determination method is further improved.

[0061] When the friction coefficient between the pulling rope and the experimental pipeline is not greater than 0.1, the fitted driving coefficient of the internal detector includes the first driving coefficient of the internal detector and the second driving coefficient of the internal detector;

[0062] When the friction coefficient between the pulling rope and the experimental pipeline is greater than 0.1, the fitted driving coefficient of the internal detector includes the third driving coefficient of the internal detector, the fourth driving coefficient of the internal detector, and the fifth driving coefficient of the internal detector.

[0063] By further considering the influence of the friction coefficient between the pulling rope and the experimental pipeline, the driving coefficient of the internal detector under the corresponding condition is calculated, which can further refine the driving coefficient of the internal detector and make the determination method more accurate.

[0064] Further, when the number of internal detector bend passes is not less than the actual number of bends of the pipeline to be detected, the pulling rope drags the internal detector, and the internal detector passes through the pipeline to be detected.

[0065] It can be understood that when the number of internal detector bend passes is not less than the actual number of bends of the pipeline to be detected, the internal detector can smoothly pass through the entire pipeline to be detected, the pulling rope will not be broken, and the phenomenon of being blocked is avoided. At this time, the pulling rope drags the internal detector, and the internal detector passes through the pipeline to be detected, completes the internal detection of the pipeline to be detected, and obtains the body state of the pipeline to be detected, including the damage type, the damage position, the broken size, and the like. It is beneficial to take preventive and repair measures for the pipeline to be detected in time, and to improve the essential safety of the oil and gas gathering pipeline.

[0066] In a second aspect, the application provides a detection device for the number of internal detector bend passes, which is used to execute the determination method of the first aspect, as shown in FIG. 2, which comprises:

[0067] The first obtaining module 21 is configured to obtain the starting force of the inner detector.

[0068] The second obtaining module 22 is configured to obtain the maximum bearable tension of the pull rope.

[0069] The third obtaining module 23 is configured to obtain the number of the inner detector elbow passes according to the starting force of the inner detector and the maximum bearable tension of the pull rope.

[0070] The detection device for the number of the inner detector elbow passes provided in the present application can execute the determination method of the first aspect, and has similar implementation principles and technical effects, which will not be described here.

[0071] Optionally, the detection device for the number of the inner detector elbow passes further comprises a fourth obtaining module configured to obtain the driving coefficient of the inner detector.

[0072] The third obtaining module is configured to obtain the number of the inner detector elbow passes according to the starting force of the inner detector, the maximum bearable tension of the pull rope and the driving coefficient of the inner detector.

[0073] In the third aspect, as shown in FIG. 3, the present application further provides an electronic device 30, which comprises a memory 302 and a processor 301.

[0074] The memory 302 stores computer execution instructions.

[0075] The processor 301 executes the computer execution instructions stored in the memory, so that the processor executes the determination method of the first aspect.

[0076] The electronic device provided in the present application comprises at least one processor 301 and a memory 302.

[0077] Optionally, the electronic device further comprises a communication component 303. The processor 301, the memory 302 and the communication component 303 are connected through a bus.

[0078] In the specific implementation process, the at least one processor executes the computer execution instructions stored in the memory, so that the at least one processor executes the above-mentioned method.

[0079] The specific implementation process of the processor 301 can refer to the above-mentioned method embodiments, which have similar implementation principles and technical effects, and will not be described here.

[0080] In the above embodiments, it should be understood that the processor can be a central processing unit (CPU), and can also be other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), etc. The general-purpose processor can be a microprocessor or any conventional processor, etc. The steps of the method disclosed in the present application can be directly embodied as hardware processor execution, or executed by a combination of hardware and software modules in the processor.

[0081] The memory can include a random access memory (RAM), and can also include a non-volatile memory (NVM), such as at least one disk memory.

[0082] The bus can be an industry standard architecture (ISA) bus, a peripheral component (PCI) bus, an extended industry standard architecture (EISA) bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For the convenience of representation, the bus in the drawings of the present application does not limit to only one bus or one type of bus.

[0083] In a fourth aspect, the present application provides a computer readable storage medium, and the computer readable storage medium stores computer execution instructions. When the processor executes the computer execution instructions, the computer execution instructions are used to implement the determination method of the first aspect.

[0084] The above readable storage medium can be realized by any type of volatile or non-volatile storage device or their combination, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disk or optical disk. The readable storage medium can be any available medium that can be accessed by a general or special purpose computer.

[0085] An example readable storage medium is coupled to the processor such that the processor can read information from the readable storage medium and can write information to the readable storage medium. Of course, the readable storage medium can also be a part of the processor. The processor and the readable storage medium can be located in an application specific integrated circuit (ASIC). Of course, the processor and the readable storage medium can also exist as discrete components in the device.

[0086] The division of units is only a logical functional division, and in actual implementation, there can be another division manner, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some interfaces, devices or units, and can be electrical, mechanical or other forms.

[0087] The units described as separate components can or can not be physically separated, and the components shown as units can or can not be physical units, that is, can be located in one place, or can be distributed on a plurality of network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the embodiment scheme.

[0088] In addition, the functional units in each embodiment of the present application can be integrated in one processing unit, or each unit can be physically present separately, or two or more units can be integrated in one unit.

[0089] If the functions are realized in the form of software function units and sold or used as independent products, they can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the present application or the essential part or part of the technical solutions that make contributions to the prior art can be embodied in the form of a software product. The computer software product is stored in a storage medium, and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the embodiments of the method of the present application. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk or an optical disk, and various program code storage media.

[0090] Those skilled in the art can understand that all or part of the steps of the above-mentioned method embodiments can be completed by program instruction related hardware. The foregoing program can be stored in a computer readable storage medium. The program executes to perform the steps of the above-mentioned method embodiments; and the foregoing storage medium includes ROM, RAM, magnetic disc or optical disc and various storage medium that can store program codes.

[0091] In a fifth aspect, the present application provides a computer program product comprising a computer program which, when executed by a processor, implements the determination method of the first aspect.

[0092] It should finally be noted that other embodiments of the present application will readily occur to those skilled in the art upon consideration of the specification and practice of the application disclosed herein. The present application is intended to include all such variations, uses or adaptations of the application in which the general principles of the application are used to good effect, and includes embodiments that are fully equivalent to the application described and shown herein, and which are within the true spirit and scope of the application. The present application is to be limited only by the claims hereinafter appended.

[0093] Hereinafter, a determination method of a pipeline provided by the present application is described in detail through specific embodiments.

[0094] Embodiment 1

[0095] The pipeline to be tested is a water mixed pipeline with an outer diameter of 114 mm, a wall thickness of 8 mm, and 1.5D elbow along the line, the number of elbows is 12, the pipeline operating pressure is low, only 0.1 MPa, and the magnetic flux leakage internal detection needs to be carried out to evaluate the pipeline body state. The conventional skin bowl differential pressure driven magnetic flux leakage internal detector cannot be used because the required driving pressure difference is high and the pipeline to be tested cannot bear it. Therefore, the determination method provided by the present application is used, which includes the following steps:

[0096] The starting force F0 of the internal detector is obtained as 600 kg;

[0097] The maximum bearing tension F of the pull rope is obtained as 147 kN ≈ 14700 kg;

[0098] The pull rope is smeared with butter, and the friction coefficient of the pull rope and the experimental pipeline is measured as 0.06;

[0099] One end of the pull rope is connected with the internal detector, and the other end is connected with the spring scale; 1 kg of load is dragged through 5 groups of experimental pipelines by the pull rope, and the 5 groups of pull forces F of the pull rope are recorded by the spring scale through measuring the pull force. i ​; wherein the first set of experimental pipelines comprises four experimental straight pipes and experimental bends which are alternately connected with each other, and the number of the experimental straight pipes and experimental bends of each set of experimental pipelines is one more than that of the previous set of experimental pipelines; the outer diameter of the experimental straight pipe is 114 mm, and the wall thickness is 8 mm, and the size of the experimental bend is 1.5D; five sets of N i -F i Data, as shown in Table 1.

[0100] Table 1: Number of bends N i -Pulling force F i Control table

[0101] According to the data in Table 1, five sets of N i -F i Based on the Kriging model, the first driving coefficient k1 of the internal detector is fitted to be 1.1398, and the second driving coefficient k2 is fitted to be 0.1031.

[0102] The above data is brought into formula (1) to calculate the number of bend passes of the internal detector:

[0103] In the formula, N r is the number of bend passes of the internal detector, the unit is piece; F is the maximum allowable tension of the pulling rope, the unit is kg; F0 is the starting force of the internal detector, the unit is kg; k1 is the first driving coefficient of the internal detector, k1 is 1.1398; k2 is the second driving coefficient of the internal detector, k2 is 0.1031.

[0104] That is, under the condition that the internal detector and the experimental pipeline have a friction coefficient of 0.06 and the pulling rope is lubricated with butter, the internal detector can pass through 15 bends.

[0105] Since the number of bend passes of the internal detector is not less than the actual number of bends of the pipeline to be tested, the pulling rope drags the internal detector to pass through the pipeline to be tested; and the internal detection of the pipeline is completed.

[0106] Example 2

[0107] The pipeline to be tested is a water mixed pipeline with an outer diameter of 114 mm and a wall thickness of 8 mm, and the bends along the line are all 1.5D, the number of bends is 12, the pipeline operating pressure is low, only 0.1 MPa, and the pipeline body state needs to be evaluated by developing magnetic flux leakage internal detection. The magnetic flux leakage internal detector driven by the conventional leather cup differential pressure cannot be used because the required driving differential pressure is high and the pipeline to be tested cannot withstand it, so the determination method provided by the application is used, which comprises the following steps:

[0108] The starting force F0 of the internal detector is obtained as 600 kg;

[0109] The maximum bearable tension of the pulling rope F = 147 kN ≈ 14700 kg is obtained;

[0110] The friction coefficient of the pulling rope and the experimental pipeline is 0.32;

[0111] One end of the pulling rope is connected with the inner detector, and the other end is connected with the spring scale; the pulling rope is used to pull a 1 kg load through 5 groups of experimental pipelines respectively, and the 5 groups of pulling forces F of the pulling rope are recorded by the spring scale measuring the pulling force i ; wherein the first group of experimental pipelines includes 4 experimental straight pipes and experimental elbows that are alternately connected with each other, and the number of the experimental straight pipes and the experimental elbows of each group of experimental pipelines is one more than that of the previous group of experimental pipelines; the outer diameter of the experimental straight pipe is 114 mm, and the wall thickness is 8 mm, and the size of the experimental elbow is 1.5D; 5 groups of N i -F i data are obtained as shown in Table 2.

[0112] Table 2 Elbow number N i -pulling force F i control table

[0113] According to the 5 groups of N i -F i data in Table 2, based on the Kriging model, the third driving coefficient k3 of the inner detector is fitted to be 0.907, the fourth driving coefficient k4 is fitted to be 6.7557, and the fifth driving coefficient k5 is fitted to be 16.0628.

[0114] The above data is brought into formula (2) to calculate the number of elbow passes of the inner detector:

[0115] In the formula, N r is the number of elbow passes of the inner detector, the unit is piece; F is the maximum bearable tension of the pulling rope, the unit is kg; F0 is the starting force of the inner detector, the unit is kg; k3 is the third driving coefficient of the inner detector, k3 is 0.907; k4 is the fourth driving coefficient of the inner detector, k4 is 6.7557; k5 is the fifth driving coefficient of the inner detector, k5 is 16.0628.

[0116] That is, under the condition that the friction coefficient of the pulling rope and the experimental pipeline is 0.32, the inner detector can only pass through 8 elbows.

[0117] Since the number of elbow passes of the inner detector is lower than the actual number of elbows of the pipeline to be tested, the pulling rope is abandoned to drag the inner detector through the pipeline to be tested.

[0118] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for determining the number of bends through which a drag-type inner detector passes, comprising the steps of: obtaining a starting force of the inner detector; obtaining a maximum bearable tension of a pulling rope; and obtaining the number of bends through which the inner detector passes according to the starting force of the inner detector and the maximum bearable tension of the pulling rope. obtaining a driving coefficient of the inner detector; and obtaining the number of bends through which the inner detector passes according to the starting force of the inner detector, the maximum bearable tension of the pulling rope and the driving coefficient of the inner detector. 5.The method of any one of claims 2-4, wherein the driving coefficient of the inner detector is obtained by the following steps: N is greater than or equal to 2; the experimental pipeline comprises a plurality of experimental straight pipes and experimental bends that are alternately connected to each other, the experimental straight pipes have the same size as the straight pipes in the pipeline to be detected, the experimental bends have the same size as the bends in the pipeline to be detected, and the number of experimental straight pipes and experimental bends in each group of experimental pipeline is one more than that in the previous group of experimental pipeline. 6.The method of claim 5, wherein when the friction coefficient between the pulling rope and the experimental pipeline is not greater than 0.1, the driving coefficient of the inner detector obtained by fitting comprises a first driving coefficient of the inner detector and a second driving coefficient of the inner detector.

2. The determination method of claim 1, wherein before obtaining the number of passes through the inner detector elbow, further comprising: 7.The method of claim 5, wherein when the friction coefficient between the pulling rope and the experimental pipeline is greater than 0.1, the driving coefficient of the inner detector obtained by fitting comprises a third driving coefficient of the inner detector, a fourth driving coefficient of the inner detector and a fifth driving coefficient of the inner detector. 8.The method of any one of claims 1-7, wherein when the number of bends through which the inner detector passes is not less than the actual number of bends in the pipeline to be detected, the pulling rope is used to drag the inner detector to pass through the pipeline to be detected.

3. The determination method according to claim 1 or 2, wherein the number of passes of the inner detector elbow is calculated by formula (1) when the coefficient of friction of the pulling rope and the pipe to be measured is not more than 0.

1. In the formula, N r is the number of the inner detector bends, units are pieces; F is the maximum bearable tension of the pulling rope, units are kg; F0 is the starting force of the inner detector, units are kg; k1 is the first driving coefficient of the inner detector, k1 is 1-2; k2 is the second driving coefficient of the inner detector, k2 is 0.1-0.

3.

4. The determination method according to claim 1 or 2, wherein when the friction coefficient of the pulling rope and the pipe to be measured is greater than 0.1, the number of throughs of the inner detector elbow is calculated by formula (2): In the formula, N r is the number of throughs of the inner detector elbow, units are pieces; F is the maximum bearable tension of the pulling rope, units are kg; F0 is the starting force of the inner detector, units are kg; k3 is the third driving coefficient of the inner detector, k3 is 0.1-3; k4 is the fourth driving coefficient of the inner detector, k4 is 6-8; k5 is the fifth driving coefficient of the inner detector, k5 is 16-17. 9.An apparatus for determining the number of bends through which a drag-type inner detector passes, configured to perform the method of any one of claims 1-8, comprising: a first obtaining module configured to obtain a starting force of the inner detector; a second obtaining module configured to obtain a maximum bearable tension of a pulling rope; and a third obtaining module configured to obtain the number of bends through which the inner detector passes according to the starting force of the inner detector and the maximum bearable tension of the pulling rope. The inner detector is dragged through N groups of experimental pipelines respectively by the pulling ropes, and N groups of pulling forces F of the pulling ropes are recorded i ; wherein, a memory and a processor; According to N sets of N i -F i Data, based on Kriging model, fitting the drive coefficient of the inner detector. the memory stores computer-executable instructions; the processor executes the computer-executable instructions stored in the memory, so that the processor performs the method of any one of claims 1-8. 11.A computer-readable storage medium, wherein the computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are executed by a processor to implement the method of any one of claims 1-8. 12.A computer program product, comprising a computer program, and the computer program is executed by a processor to implement the method of any one of claims 1-8. ​ ​ ​ 10. An electronic device comprising: ​ ​ ​ ​ ​

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