A method and system for determining the interference of a soluble pig ball

Abstract

The present invention discloses a method and system for determining the interference fit of a soluble pig. The method comprises obtaining the diameter wear per kilometer of the pig's contact surface, the surface area of ​​the pig, the area of ​​the contact surface between the pig and the wear test equipment before the wear test, and the length and inner diameter of the natural gas gathering and transmission pipeline to be cleaned; obtaining the diameter wear per kilometer of the pig; further obtaining the theoretical diameter wear of the pig after the pipeline is cleaned; and finally determining the interference fit of the soluble pig based on the theoretical diameter wear of the pig, the inner diameter of the natural gas gathering and transmission pipeline to be cleaned, and the interference fit margin. The method is simple, convenient, highly operable, reliable, and practical, and effectively determines the interference fit of the pig.

Description

Technical Field

[0001] The invention belongs to the technical field of pipeline cleaning, and relates to a method and system for determining the interference amount of a soluble pig ball. Background Art

[0002] During gas field production, underground natural gas must be transported through pipelines. Since raw natural gas is often accompanied by produced water, foaming agents, and mechanical impurities, these impurities can affect pipeline transmission capacity, efficiency, metering accuracy, clog instruments, and exacerbate pipeline corrosion. Conventional pigging techniques are prone to blockage, ball loss, and difficulty locating smaller gathering and transmission pipelines within gas fields, and mature pigging techniques are currently unavailable. Consequently, small-diameter gathering and transmission pipelines are rarely pigged. During winter operation, accumulated liquid within the pipelines can easily form hydrates, freeze, and cause transmission interruptions, impacting peak winter gas supply and, in severe cases, leading to safety incidents.

[0003] To address this issue, a soluble pigging technology was developed, and field trials were conducted on multiple main pipelines. Given the solubility of the pigs and the influence of the temperature of the pipeline medium on solubility, the uncertainty of the interference fit of the pigs results in inconsistent cleaning effectiveness. Excessive interference creates high pressure when pushing the pigs, causing the pigs to become stuck; while insufficient interference creates insufficient cleaning force and poor cleaning efficiency. Currently, there is no effective method to scientifically determine the interference fit of the pigs, ensuring they adhere tightly to the pipe wall to prevent air and liquid leaks while also ensuring smooth pushing and preventing jams, guaranteeing optimal removal of accumulated liquid or impurities. Summary of the Invention

[0004] In view of the problems existing in the prior art, the present invention provides a method and system for determining the interference fit of a soluble pig, thereby solving the technical problem in the prior art that the interference fit of a soluble pig cannot be determined.

[0005] The present invention is achieved through the following technical solutions:

[0006] A method for determining the interference fit of a soluble pig ball comprises the following steps:

[0007] Obtain the wear loss per kilometer of contact surface diameter of the pig during the abrasion test, the contact surface area between the pig and the abrasion test equipment before the abrasion test, the surface area of ​​the pig, and the length and inner diameter of the natural gas gathering pipeline to be cleaned;

[0008] Obtaining the diameter wear of the pig per kilometer according to the contact surface diameter wear per kilometer of the pig, the area of ​​the contact surface, and the surface area of ​​the pig;

[0009] Obtaining theoretical diameter wear of the pig after the pipeline is cleaned based on the diameter wear of the pig per kilometer and the length of the natural gas gathering and transportation pipeline to be cleaned;

[0010] The interference fit of the soluble pig is determined according to the theoretical diameter wear of the pig, the inner diameter of the natural gas gathering and transportation pipeline to be cleaned, and the interference fit margin.

[0011] Preferably, the wear of the pig per kilometer of contact surface diameter is specifically:

[0012]

[0013] Where,

[0014] DW 1km接触面 For the wear test, the pig wears per kilometer of contact surface diameter;

[0015] D 磨耗前 The diameter of the contact surface between the pig and the wear test equipment before the wear test;

[0016] D 磨耗后 The diameter of the contact surface between the pig and the wear test equipment after the wear test;

[0017] n1 is the number of equipment running circles corresponding to 1 km of wear on the wear test equipment;

[0018] n2 is the number of revolutions the equipment runs during the wear test.

[0019] Preferably, the wear of the ball diameter per kilometer of the pipe cleaning ball is specifically:

[0020]

[0021] Where DW 1km球体 is the wear of the pig per kilometer of ball diameter;

[0022] S 接触面 is the contact area between the pig and the abrasion test equipment before the abrasion test;

[0023] S 球表面积 is the surface area of ​​the pig.

[0024] Preferably, the process of determining the contact area between the pig and the abrasion test equipment before the abrasion test is as follows:

[0025] S 接触面 = 接触面 (π* 磨耗前 )

[0026] Where W 接触面 It is the contact surface width between the pig and the abrasion test equipment before the abrasion test.

[0027] Preferably, the theoretical diameter wear of the pig is specifically:

[0028] DW 磨耗 =*DW 1km球体

[0029] Where,

[0030] DW 磨耗 is the theoretical ball diameter wear of the pig;

[0031] L is the length of the natural gas gathering and transmission pipeline to be cleaned.

[0032] Preferably, the interference fit of the soluble pig ball is:

[0033]

[0034] Where y is the interference of the soluble pig ball;

[0035] d is the inner diameter of the natural gas gathering and transmission pipeline to be cleaned;

[0036] y′ is the interference allowance.

[0037] Preferably, the interference margin is 0.5% to 1.2%.

[0038] A system for determining the interference amount of a soluble pig ball, comprising:

[0039] Data acquisition module: The data acquisition module is used to obtain the wear loss per kilometer of the contact surface diameter of the pig during the abrasion test, the area of ​​the contact surface between the pig and the abrasion test equipment before the abrasion test, the surface area of ​​the pig, and the length and inner diameter of the natural gas gathering and transmission pipeline to be cleaned;

[0040] The first data processing module is used to obtain the diameter wear of the pig per kilometer according to the contact surface diameter wear per kilometer of the pig, the area of ​​the contact surface, and the surface area of ​​the pig;

[0041] Second data processing module: The second data processing module is used to obtain the theoretical diameter wear of the pig after the pipeline is cleaned according to the ball diameter wear per kilometer of the pig and the length of the natural gas gathering and transportation pipeline to be cleaned;

[0042] The third data processing module is used to determine the interference of the soluble pig according to the theoretical diameter wear of the pig, the inner diameter of the natural gas gathering pipeline to be cleaned, and the interference margin.

[0043] A terminal device comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the above method when executing the computer program.

[0044] A computer-readable storage medium stores a computer program, which implements the steps of the above method when executed by a processor.

[0045] Compared with the prior art, the present invention has the following beneficial technical effects:

[0046] Based on the above technical solution, the present invention discloses a method for determining the interference fit of a soluble pipe cleaning ball. By fitting and calculating the relevant data obtained from the wear test, the interference fit of the soluble pipe cleaning ball is obtained. This method is simple and convenient, with strong operability. The process effectively simulates the movement process of the soluble pipe cleaning ball during the pipe cleaning operation, has high reliability and practicality, and effectively obtains the interference fit of the pipe cleaning ball. Setting the interference fit margin can not only make the soluble pipe cleaning ball stick to the pipe wall without air or liquid leakage, but also ensure that the soluble pipe cleaning ball pushes smoothly without getting stuck, thereby ensuring the best efficiency in clearing accumulated liquid or impurities. This method has the characteristics of scientificity, practicality, and ease of operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0048] Figure 1 Schematic diagram of a flow chart of a method for determining the interference fit of a soluble pig ball in Example 1 of the present invention;

[0049] Figure 2 This is a schematic structural diagram of a system for determining the interference amount of a soluble pig ball in Example 2 of the present invention;

[0050] Figure 3 Schematic diagram of the structure of the Akron abrasion machine used in the abrasion test in Example 3 of the present invention;

[0051] Figure 4 This is a schematic diagram of the structure of the experimental sample after the pipe cleaning ball is cut in Example 3 of the present invention;

[0052] Figure 5 This is a flow chart for determining the interference amount of the soluble ball in Example 3 of the present invention;

[0053] Figure 6This is the method for determining the interference amount of the soluble ball in Example 4 of the present invention.

[0054] Among them, 1. rubber wheel shaft, 2. motor, 3. reducer, 4. grinding wheel, 5. electronic counter, 6. center hole, 7. first side of the specimen, 8. second side of the specimen. DETAILED DESCRIPTION

[0055] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0056] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0057] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0058] In the description of the embodiments of the present invention, it should be noted that if the terms "upper," "lower," "horizontal," "inner," etc. appear, the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the inventive product is typically placed when in use. These terms are merely for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first," "second," etc. are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0059] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0060] In the description of the embodiments of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0061] The present invention is described in further detail below with reference to the accompanying drawings:

[0062] Example 1

[0063] like Figure 1 As shown, the present invention discloses a method for determining the interference of a soluble pig ball, comprising the following steps:

[0064] S1: Obtain the wear loss per kilometer of contact surface diameter of the pig during the abrasion test, the contact surface area between the pig and the abrasion test equipment before the abrasion test, the surface area of ​​the pig, and the length and inner diameter of the natural gas gathering and transmission pipeline to be cleaned;

[0065] The specific wear of the pig ball per kilometer of contact surface diameter is:

[0066]

[0067] Where,

[0068] DW 1km接触面 For the wear test, the pig wears per kilometer of contact surface diameter;

[0069] D 磨耗前 The diameter of the contact surface between the pig and the wear test equipment before the wear test;

[0070] D 磨耗后 The diameter of the contact surface between the pig and the wear test equipment after the wear test;

[0071] n1 is the number of equipment running circles corresponding to 1 km of wear on the wear test equipment;

[0072] n2 is the number of revolutions the equipment runs during the wear test.

[0073] S2: Obtaining the diameter wear of the pig per kilometer according to the diameter wear of the contact surface per kilometer of the pig, the area of ​​the contact surface between the pig and the wear test equipment before the wear test, and the surface area of ​​the pig;

[0074] The specific wear of the pig ball diameter per kilometer is:

[0075]

[0076] Where DW 1km球体 is the wear of the pig per kilometer of ball diameter;

[0077] S 接触面 is the contact area between the pig and the abrasion test equipment before the abrasion test;

[0078] S 球表面积 is the surface area of ​​the pig.

[0079] The contact area between the pig and the abrasion test equipment is determined as follows:

[0080] S 接触面 =W 接触面 (π*D 磨耗前 )

[0081] Where W 接触面 It is the contact surface width between the pig and the abrasion test equipment before the abrasion test.

[0082] S3: Obtaining theoretical diameter wear of the pig after the pipeline is cleaned based on the diameter wear of the pig per kilometer and the length of the natural gas gathering and transportation pipeline to be cleaned;

[0083] The theoretical diameter wear of the pig is as follows:

[0084] DW 磨耗 =L*DW 1km球体

[0085] Where,

[0086] DW 磨耗 is the theoretical ball diameter wear of the pig;

[0087] L is the length of the natural gas gathering and transmission pipeline to be cleaned.

[0088] S4: determining the interference of the soluble pig according to the theoretical diameter wear of the pig, the inner diameter of the natural gas gathering pipeline to be cleaned, and the interference margin;

[0089] The interference fit of the soluble pig ball is as follows:

[0090]

[0091] Where y is the interference of the soluble pig ball;

[0092] d is the inner diameter of the natural gas gathering and transmission pipeline to be cleaned.

[0093] y′ is the interference margin, which can be 0.5% to 1.2%.

[0094] More preferably, the abrasion test in the present invention can be carried out at 10-50°C. By spraying water of corresponding temperature on the abrasion test equipment to simulate the actual temperature of the corresponding pipe cleaning, the simulation of the pipe cleaning ball operating environment under different ambient temperatures is achieved.

[0095] Example 2

[0096] In addition, if Figure 2 As shown, the present invention also discloses a system for determining the interference amount of a soluble pig ball, comprising:

[0097] Data acquisition module: The data acquisition module is used to obtain the wear loss per kilometer of the contact surface diameter of the pig during the abrasion test, the area of ​​the contact surface between the pig and the abrasion test equipment before the abrasion test, the surface area of ​​the pig, and the length and inner diameter of the natural gas gathering and transmission pipeline to be cleaned;

[0098] The first data processing module is used to obtain the diameter wear of the pig per kilometer according to the contact surface diameter wear per kilometer of the pig, the area of ​​the contact surface, and the surface area of ​​the pig;

[0099] Second data processing module: The second data processing module is used to obtain the theoretical diameter wear of the pig after the pipeline is cleaned according to the ball diameter wear per kilometer of the pig and the length of the natural gas gathering and transportation pipeline to be cleaned;

[0100] The third data processing module is used to determine the interference of the soluble pig according to the theoretical diameter wear of the pig, the inner diameter of the natural gas gathering pipeline to be cleaned, and the interference margin.

[0101] Example 3

[0102] In order to further explain the technical solution of the present invention, this embodiment is used for illustration:

[0103] (1) Akron abrasion machine (see Figure 3 ), including the rubber wheel shaft 1, motor 2, reducer 3, grinding wheel 4 and electronic counter 5, to make the pig wear test sample (see Figure 4 ) to measure the maximum outer diameter of the pig before and after abrasion, as well as the width of the contact surface between the specimen and the abrasion machine's grinding wheel. During abrasion, the specimen was sprayed with clean water at different temperatures (10°C to 50°C) to simulate the accumulation of liquid in the pipeline at different temperatures (10°C to 50°C). The abrasion mileage was calculated based on the diameter loss of the pig, combined with the abrasion machine's grinding wheel speed and diameter. The wear thickness per kilometer was calculated based on the reduction in the diameter of the pig during abrasion.

[0104] (2) Interference calculation. Calculate the contact area between the sample and the grinding wheel of the abrasive machine. Divide the surface area of ​​the soluble pig by the contact area between the sample and the grinding wheel of the abrasive machine to obtain the multiple of the surface area of ​​the soluble pig and the contact area of ​​the sample grinding wheel. This is used to calculate the pig wear per kilometer.

[0105] To ensure the cleaning efficiency of soluble pigs, the optimal interference fit for soluble pigs is calculated based on the length and inner diameter of natural gas gathering and transmission pipelines, assuming the pigs have an interference margin of 0.5% to 1.2% when they reach their destination. The interference margin is a reserve allowance for the pigs' solubility, ensuring they adhere closely to the pipe wall, preventing gas and liquid leakage and ensuring efficient cleaning.

[0106] A method for determining the interference fit of soluble pigs in natural gas gathering and transportation pipelines:

[0107] like Figure 5 As shown, step 1: data preparation before the experiment

[0108] (1) Length of natural gas gathering and transmission pipeline, L (km)

[0109] (2) Inner diameter of natural gas gathering and transmission pipeline, d (mm)

[0110] Step 2: Wear test

[0111] (1) Make the pipe cleaning ball test sample (see Figure 4 ), the sample thickness is 5 to 50 mm, including a center hole 6, a first side surface 7 of the sample, and a second side surface 8 of the sample. The center hole is punched, and the hole diameter is consistent with the diameter of the rubber wheel shaft.

[0112] (2) Measure the maximum outer diameter of the sample, that is, the outer diameter of the pipe cleaning ball before wear, recorded as D 磨耗前 , (mm, millimeters).

[0113] (3) After grinding both sides of the specimen, glue it to the rubber wheel. Fix the rubber wheel with the specimen glued to it on the rubber wheel shaft. Adjust the grinding wheel of the Akron abrader so that it is in full contact with the specimen.

[0114] Measure the contact width between the sample and the grinding wheel, recorded as W 接触面 , (mm, millimeters).

[0115] (4) Spray the sample with clean water of different temperatures (10℃~50℃), turn on the electronic counter switch, adjust the preset number button n=2123~3416, press the "Start" button to start the experiment, when the count reaches the preset value, press the "Stop" and "Reset" buttons, remove the sample, brush off the wear debris, measure the maximum outer diameter of the sample, that is, the outer diameter of the pig after wear, and record it as D 磨耗后 , (mm, millimeters).

[0116] Step 3: Calculate the interference

[0117] Abrasion loss of soluble pig sample with 1 km contact surface diameter:

[0118]

[0119] Where,

[0120] DW 1km接触面，T is the wear loss per kilometer of contact surface diameter of the pig when the wear test is carried out at temperature T;

[0121] D 磨耗前 The diameter of the contact surface between the pig and the wear test equipment before the wear test;

[0122] D 磨耗后 The diameter of the contact surface between the pig and the wear test equipment after the wear test;

[0123] n1 is the number of equipment running circles corresponding to 1 km of wear on the wear test equipment. In this embodiment, n1 is 2123;

[0124] n2 is the number of revolutions the equipment runs during the wear test.

[0125] Contact area between the soluble pig sample and the Akron abrader grinding wheel:

[0126] S 接触面 =W 接触面 (π*D 磨耗前 )(mm 2 , square millimeters)

[0127] Surface area of ​​soluble pig:

[0128]

[0129] Wear loss of pig ball diameter per 1km:

[0130]

[0131] Calculate the wear of the soluble pig ball diameter after pigging is completed:

[0132] DW 磨耗，T =L*DW 1km球体，T (mm, millimeters)

[0133] Optimal interference:

[0134]

[0135] Where y T is the interference of the soluble pig ball when pigging at temperature T;

[0136] d is the inner diameter of the natural gas gathering and transmission pipeline to be cleaned.

[0137] y′ is the interference allowance.

[0138] In this embodiment, the interference margin is 0.5% to 1.2%. When pigging at temperature T, the interference margin of the soluble pig is

[0139] This method uses an Akron abrasion machine to obtain wear test data and simulate different pigging temperatures to determine the interference fit of a soluble pig at a specific pigging temperature. The data is obtained through experimentation, measurement, and calculation. The experimental process simulates the movement of a soluble pig during a pigging operation, demonstrating scientific validity, reliability, and practicality.

[0140] Field tests on 10 gas production pipelines and 4 gas production mains showed that the interference fit of soluble pigging balls at different temperatures is targeted, reliable, and applicable, and plays a significant role in guiding the pigging of on-site gathering and transportation pipelines.

[0141] The working principle and use process of the present invention:

[0142] Working principle of Akron abrasion machine:

[0143] (1) Transmission: The motor is connected to the reducer through a coupling, which makes the rubber wheel shaft rotate clockwise, and the sample is clamped on the rubber shaft.

[0144] (2) Electronic counter: After "starting", the execution relay inside the machine is immediately energized, and its contacts are directly connected to the power supply to output outside the machine, making the motor run. The end of the grinding wheel shaft is equipped with a photoelectric conversion switch connected to the counter for counting. When the count reaches the preset value, the relay automatically disengages.

[0145] Example 4

[0146] In order to better understand the technical solution of the present invention, it is described through the following examples:

[0147] like Figure 6 As shown in the figure, the optimal interference fit of the soluble pig is calculated for a natural gas gathering and transportation pipeline of φ219×7×11 (outer diameter (mm)×wall thickness (mm)×length (km)) at a natural gas temperature of 40°C.

[0148] Step 1: Data preparation before the experiment

[0149] (1) Length of natural gas gathering and transmission pipeline, L = 11 km,

[0150] (2) Inner diameter of natural gas gathering and transmission pipeline, d = 219-2 × 7 = 205 mm;

[0151] Step 2: Wear test

[0152] (1) Prepare the pipe cleaning ball test sample and measure the maximum outer diameter of the sample, that is, the outer diameter of the pipe cleaning ball before wear, which is recorded as D 磨耗前 =217mm.

[0153] (2) After grinding both sides of the specimen, glue it to the rubber wheel. Fix the rubber wheel with the specimen glued to it on the rubber wheel shaft. Adjust the grinding wheel of the Akron abrader so that it is in full contact with the specimen.

[0154] Measure the contact width between the sample and the grinding wheel, recorded as W 接触面 =44mm.

[0155] (3) Spray the sample with 40℃ clean water, adjust the preset number button to 2123, start the experiment, remove the sample after the end, brush off the wear debris, and measure the maximum outer diameter of the sample, that is, the outer diameter of the pig after wear, and record it as D 磨耗后 =212.5mm.

[0156] Step 3: Calculate the interference

[0157] Abrasion loss of soluble pig sample with 1 km contact surface diameter:

[0158]

[0159]

[0160] DW 1km接触面，40℃ =217-212.5=4.5mm

[0161] Contact area between the soluble pig sample and the Akron abrader grinding wheel:

[0162] S 接触面 =W 接触面 (π*D 磨耗前 )

[0163] S 接触面 =44(π*217)=29980.72mm 2

[0164] Surface area of ​​soluble pig:

[0165]

[0166]

[0167] Wear loss of pig ball diameter per 1km:

[0168]

[0169]

[0170] Calculate the wear of the soluble pig ball diameter after pigging is completed:

[0171] DW 磨耗，40℃ =L*DW 1km球体，40℃

[0172] DW 磨耗，40℃ =11*0.91=10.04mm

[0173] Optimal interference:

[0174]

[0175]

[0176] y 40℃ =5.4%~6.1%

[0177] Example 5

[0178] Further, in order to effectively explain the present invention, the following examples are provided for illustration:

[0179] Calculate the optimal interference fit of a soluble pig for a natural gas gathering and transportation pipeline of φ219×7×11 (outer diameter mm×wall thickness mm×length km) at a natural gas temperature of 25°C.

[0180] Step 1: Data preparation before the experiment

[0181] (1) Length of natural gas gathering and transmission pipeline, L = 11 km,

[0182] (2) Inner diameter of natural gas gathering and transmission pipeline, d = 219-2 × 7 = 205 mm;

[0183] Step 2: Wear test

[0184] (1) Prepare the pipe cleaning ball test sample and measure the maximum outer diameter of the sample, that is, the outer diameter of the pipe cleaning ball before wear, which is recorded as D 磨耗前 =217mm.

[0185] (2) After grinding both sides of the specimen, glue it to the rubber wheel. Fix the rubber wheel with the specimen glued to it on the rubber wheel shaft. Adjust the grinding wheel of the Akron abrader so that it is in full contact with the specimen.

[0186] Measure the contact width between the sample and the grinding wheel, recorded as W 接触面 =44mm.

[0187] (3) Spray the sample with 25℃ clean water, adjust the preset number button to 2123, start the experiment, remove the sample after the end, brush off the wear debris, and measure the maximum outer diameter of the sample, that is, the outer diameter of the pig after wear, and record it as D 磨耗后 =212.5mm.

[0188] Step 3: Calculate the interference

[0189] Abrasion loss of soluble pig sample with 1 km contact surface diameter:

[0190]

[0191]

[0192] DW 1km接触面，25℃ =217-213.8=3.2mm

[0193] Contact area between the soluble pig sample and the Akron abrader grinding wheel:

[0194] S 接触面 =W 接触面 (π*D 磨耗前 )

[0195] S 接触面 =44(π*217)=29980.72mm 2

[0196] Soluble pig surface area:

[0197]

[0198]

[0199] Wear loss of pig ball diameter per 1km:

[0200]

[0201]

[0202] Calculate the wear of the soluble pig ball diameter after pigging is completed:

[0203] DW 磨耗，25℃ =L*DW 1km球体，25℃

[0204] DW 磨耗，25℃ =11*0.65=7.15mm

[0205] Optimal interference:

[0206]

[0207]

[0208] y 40℃ =3.99%~4.69%

[0209] In addition, a schematic diagram of a terminal device is provided in one embodiment of the present invention. The terminal device in this embodiment includes: a processor, a memory, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of each of the aforementioned method embodiments are implemented. Alternatively, when the processor executes the computer program, the functions of each module / unit in each of the aforementioned device embodiments are implemented.

[0210] The computer program may be divided into one or more modules / units, which are stored in the memory and executed by the processor to accomplish the present invention.

[0211] The terminal device may be a computing device such as a desktop computer, a notebook computer, a PDA, a cloud server, etc. The terminal device may include, but is not limited to, a processor and a memory.

[0212] The processor can be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.

[0213] The memory may be used to store the computer programs and / or modules, and the processor implements various functions of the terminal device by running or executing the computer programs and / or modules stored in the memory and calling the data stored in the memory.

[0214] If the module / unit integrated in the terminal device is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present invention implements all or part of the process in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by a processor, it can implement the steps of each of the above-mentioned method embodiments. The computer program includes computer program code, which can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electric carrier signal, telecommunication signal and software distribution medium. It should be noted that the content contained in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable media do not include electric carrier signals and telecommunication signals.

[0215] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A method for determining the interference fit of a soluble pig ball, characterized in that: The following steps are involved: Obtain the wear loss per kilometer of contact surface diameter of the pig during the abrasion test, the contact surface area between the pig and the abrasion test equipment before the abrasion test, the surface area of ​​the pig, and the length and inner diameter of the natural gas gathering pipeline to be cleaned; Obtaining the diameter wear of the pig per kilometer according to the contact surface diameter wear per kilometer of the pig, the area of ​​the contact surface, and the surface area of ​​the pig; Obtaining theoretical diameter wear of the pig after the pipeline is cleaned based on the diameter wear of the pig per kilometer and the length of the natural gas gathering and transportation pipeline to be cleaned; The interference fit of the soluble pig is determined according to the theoretical diameter wear of the pig, the inner diameter of the natural gas gathering and transportation pipeline to be cleaned, and the interference fit margin.

2. The method for determining the interference fit of a soluble pig according to claim 1, wherein: The wear of the pig ball per kilometer of contact surface diameter is specifically: Where, DW 1km接触面 For the wear test, the pig wears per kilometer of contact surface diameter; D 磨耗前 The diameter of the contact surface between the pig and the wear test equipment before the wear test; D 磨耗后 The diameter of the contact surface between the pig and the wear test equipment after the wear test; n1 is the number of equipment running circles corresponding to 1 km of wear on the wear test equipment; n2 is the number of revolutions the equipment runs during the wear test.

3. The method for determining the interference fit of a soluble pig according to claim 1, wherein: The wear of the pig ball per kilometer of sphere diameter is specifically: Where DW 1km球体 is the wear of the pig per kilometer of ball diameter; S 接触面 is the contact area between the pig and the abrasion test equipment before the abrasion test; S 球表面积 is the surface area of ​​the pig.

4. The method for determining the interference fit of a soluble pig according to claim 3, wherein: The process of determining the contact area between the pig and the abrasion test equipment before the abrasion test is as follows: S 接触面 =W 接触面 (π*D 磨耗前 ) Where W 接触面 It is the contact surface width between the pig and the abrasion test equipment before the abrasion test.

5. The method for determining the interference fit of a soluble pig according to claim 1, wherein: The theoretical diameter wear of the pig is specifically: DW 磨耗 =L*DW 1km球体 Where, DW 磨耗 is the theoretical ball diameter wear of the pig; L is the length of the natural gas gathering and transmission pipeline to be cleaned.

6. The method for determining the interference of a soluble pig according to claim 1, characterized in that: The interference fit of the soluble pig ball is specifically as follows: Where y is the interference of the soluble pig ball; d is the inner diameter of the natural gas gathering and transmission pipeline to be cleaned; y′ is the interference allowance.

7. The method for determining the interference fit of a soluble pig according to claim 6, wherein: The interference margin is 0.5% to 1.2%.

8. A system for determining the interference of a soluble pig ball, characterized in that: include: Data acquisition module: The data acquisition module is used to obtain the wear loss per kilometer of the contact surface diameter of the pig during the abrasion test, the area of ​​the contact surface between the pig and the abrasion test equipment before the abrasion test, the surface area of ​​the pig, and the length and inner diameter of the natural gas gathering and transmission pipeline to be cleaned; The first data processing module is used to obtain the diameter wear of the pig per kilometer according to the contact surface diameter wear per kilometer of the pig, the area of ​​the contact surface, and the surface area of ​​the pig; Second data processing module: The second data processing module is used to obtain the theoretical diameter wear of the pig after the pipeline is cleaned according to the ball diameter wear per kilometer of the pig and the length of the natural gas gathering and transportation pipeline to be cleaned; The third data processing module is used to determine the interference of the soluble pig according to the theoretical diameter wear of the pig, the inner diameter of the natural gas gathering pipeline to be cleaned, and the interference margin.

9. A terminal device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

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