Multi-manifold natural gas gathering and transportation pipeline timing speed control pipe cleaner and method

Abstract

The invention belongs to the technical field of pipeline cleaning, and particularly relates to a multi-manifold natural gas gathering and transportation pipeline timing speed control pipe cleaner and method. The pipe cleaner comprises a pipe cleaner body, a valve seat, a bypass valve, a supporting piece and a time controller. The supporting piece is connected to the inner side wall of the pipe cleaner body. One end of the supporting piece is connected with the valve seat, the valve seat is arranged on the end face of one end of the pipe cleaner body, bypass valves are connected to the valve seat, and the number of the bypass valves is the same as that of air inlet points of a to-be-cleaned pipeline; the supporting piece is connected with a time controller used for sequentially controlling the bypass valves to be opened according to set time. The pipe cleaner is simple in structure, the number of the bypass valves is determined by the number of the air inlet points, the bypass quantity and the opening time are calculated through multiphase flow simulation software OLGA, gathering and transportation pipelines of the multiple air inlet points are cleaned, control over the speed of the pipe cleaner at different pipe sections is achieved, slug hydrops in front of the pipe cleaner are relieved, and the pipe cleaner can be used for cleaning the gathering and transportation pipelines of the multiple air inlet points. And the safety of downstream equipment is ensured.

Description

Technical Field

[0001] This invention belongs to the field of pipeline cleaning technology, specifically relating to a timed speed-controlled pipeline cleaning device and method for multi-manufacturer natural gas gathering and transmission pipelines. Background Technology

[0002] During gas field development, underground natural gas needs to be transported through pipelines. Since raw natural gas often contains produced water, foaming agents, and mechanical impurities, these can affect pipeline capacity, efficiency, metering accuracy, clog instruments, and exacerbate pipeline corrosion during gathering and transportation. For gas field gathering and transmission trunk lines, conventional pipeline cleaning techniques generally require well shutdown and production adjustment for cleaning operations. Therefore, cleaning operations affect gas production, thus impacting single-well productivity. During winter operations, this can even affect peak gas supply.

[0003] As gas fields are developed on a large scale, more and more natural gas wells are entering the middle and late stages of their life cycle. As a result, the amount of produced water will gradually increase, and the problem of liquid accumulation in the gathering and transmission trunk lines will become more and more prominent. Frequent pipeline cleaning is an inevitable trend, and it is urgent to solve the problem of shutting down wells and adjusting production during pipeline cleaning operations.

[0004] Currently, various gas fields and research institutes in China have developed a variety of jet pigs to address this problem. Patent applications and academic papers can be found on related jet pig technologies, including introductions to principles and field tests. While these technologies do solve the speed control issue, the pig's speed remains constant throughout the entire process, from signal transmission to reception. In other words, the jet orifice diameter remains fixed, which is clearly unsuitable for pipelines with inlets along the pipeline. When gas enters at the inlet, the pig's speed increases, leading to liquid accumulation and slugging. This liquid can then enter the downstream separator, potentially flooding the compressor and impacting production.

[0005] For the issue of well shut-in and production adjustment during pipeline cleaning operations on gathering and transmission branch lines with gas inlets along the pipeline, there is an urgent need to combine theory with practice to explore a relatively simple and practical speed control method, so as to solve the problems of speed control at multiple gas inlets along the pipeline, alleviate slug accumulation, and reduce the impact of well shut-in on production. Summary of the Invention

[0006] To address the aforementioned technical problems, this invention provides a timed speed-controlled pipeline cleaning device and method for multi-manufacturer natural gas gathering and transmission pipelines.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A timed and speed-controlled pipeline cleaning device for multi-manufacturer natural gas gathering and transmission pipelines includes a cleaning device body, a valve seat, a bypass valve, a support component, and a timer. The support component is connected to the inner wall of the cleaning device body. One end of the support component is connected to the valve seat, and the valve seat is placed on one end face of the cleaning device body. A bypass valve is connected to the valve seat, and the number of bypass valves is the same as the number of gas inlet points of the pipeline to be cleaned. A timer is connected to the support component for sequentially controlling the opening of the bypass valves according to a set time.

[0008] It also includes a signal transmitter and a signal receiver; the signal transmitter is connected to the support; the signal receiver is placed outside the pipe to be cleaned; the signal receiver is electrically connected to the signal transmitter.

[0009] The signal transmitter is coaxially mounted with the pig body. The pigging device body includes a pressure plate, a rubber cup, and a steel frame; two sets of rubber cups are provided; the two sets of rubber cups are respectively connected to the outer periphery of both ends of the steel frame; the pressure plate is connected to the rubber cups and is used to press the rubber cups; the steel frame is a hollow columnar structure; the support is connected to the inner wall of the steel frame.

[0010] The support includes a clamping plate and a support plate; the clamping plate is connected to the inner wall of the pig body through the support plate; the clamping plate is used to clamp and install the signal transmitter and is fixedly connected to the valve seat.

[0011] It also includes a signal transmitter and a signal receiver; the signal transmitter is connected to the support; the signal receiver is placed outside the pipeline to be cleaned; the signal receiver is electrically connected to the signal transmitter; the pig body includes a pressure plate, a piston cup, and a steel frame; two sets of piston cups are provided; the two sets of piston cups are respectively connected to the outer periphery of both ends of the steel frame; the pressure plate is connected to the piston cup and is used to press the piston cup; the steel frame is a hollow columnar structure; the support is connected to the inner wall of the steel frame; the support includes a clamping plate and a support plate; the clamping plate is connected to the inner wall of the pig body through the support plate; the clamping plate is used to clamp and install the signal transmitter and is fixedly connected to the valve seat.

[0012] A method for cleaning a multi-manufacturer natural gas gathering and transmission pipeline using a timed, speed-controlled pig includes the following steps: Step 1: Preparation for cleaning; There are n air inlets on the pipeline. The starting point is designated as the first air inlet, the next air inlet as the second air inlet, and so on. The pipe section between the first and second air inlets is designated as the first pipe section, the pipe section between the second and third air inlets is designated as the second pipe section, and so on. The bypass valve to be opened in the first pipe section is designated as bypass valve one, the bypass valve to be opened in the second pipe section is designated as bypass valve two, and so on. Then, the bypass valve opening time and the pig operation time are numbered. Step 2: Design the bypass flow rate of the bypass valve; Step 3: Calculate the operating time of the pig in each pipe section; Step 4: Timer settings; The running time of the pig in each pipe section, calculated in step three, is set on the timer. Step 5: Pig Operation After the pipeline pig is sent into the pipeline to be cleaned within the preset time, the pig is launched and the timer starts timing. According to the time set by the timer in step four, the corresponding bypass valve is opened, and the pig runs in the corresponding pipeline section at a predetermined speed until it completes running at a predetermined speed in the (n-1)th pipeline section.

[0013] The method for numbering the bypass valve opening time in step one is to start from time 2, i.e., the opening time of bypass valve two, denoted as T2; the opening time of bypass valve three is time 3, denoted as T3; ..., the opening time of bypass valve n is time n, denoted as Tn, and so on. Bypass valve one is always in a fully open state and does not need to be opened at a time. The method for numbering the pig operation time is to denot the operation time of the first pipe section as t1, the operation time of the second pipe section as t2, ..., the operation time of the (n-1)th pipe section as tn-1. The method for setting the timer in step four is to start from time 2, T2=t0+t1, T3=t0+t1+t2, ..., Tn=t0+t1+t2+...+tn-1, where t0 is the time when the pig is placed in the pipeline and launched, that is, after time t0, the pig is launched.

[0014] In step five, the specific process of the pig operation is as follows: at a preset time t0, the pig is sent into the pipeline to be cleaned. After t0, the pig is launched, and the timer starts timing. When the timer reaches the set time T2, which is the opening time of bypass valve two, gas flow into the second air inlet, and bypass valve two automatically opens fully. The pig runs at a predetermined speed in the second pipeline section, i.e., the section between the second and third air inlets. When the timer reaches the set time T3, which is the opening time of bypass valve three, gas flow into the third air inlet, and bypass valve three automatically opens fully. The pig runs at a predetermined speed in the third pipeline section. This process continues until the (n-1)th pipeline section has been completed at a predetermined speed. Accordingly, the opening degree of the bypass valve in the first pipe section is the opening degree φ1 of bypass valve one; the opening degree of the bypass valve in the second pipe section is the sum of the opening degrees of bypass valve one and bypass valve two, i.e., φ1+φ2; the opening degree of the bypass valve in the third pipe section is the sum of the opening degrees of bypass valve one, bypass valve two and bypass valve three, i.e., φ1+φ2+φ3; ...; the opening degree of the bypass valve in the (n-1)th pipe section is the sum of the opening degrees of bypass valve one, bypass valve two, ..., bypass valve n-1 and bypass valve n, i.e., φ1+φ2+φ3+...+φn-1+φn, thereby satisfying the control of the pig speed in different pipe sections under multiple air inlet points.

[0015] The specific method for designing the bypass valve's bypass capacity in step two is to use multiphase flow OLGA software to simulate the bypass capacity of each pipe segment under the conditions of air intake and maximum pig speed. This bypass capacity is represented by φ. The method for calculating the pig's running time in each pipe segment in step three is to input the basic parameters of the pipe segment, namely air intake, pipe segment specifications, inlet and outlet pressures, and bypass valve opening φ, into the multiphase flow OLGA software. The running time of the pig in each pipe segment is simulated and calculated, denoted as t1, t2, ... Here, the pig's insertion and launch time in the pipeline is denoted as t0, which is the time after the pig is inserted into the pipeline and launched. The beneficial effects of this invention are: (1) The pig of the present invention includes a pig body, a valve seat, a bypass valve, a support and a timer, which has a simple structure and is easy to operate.

[0016] (2) In this invention, the number of bypass valves is determined by the number of air inlets. The bypass volume and the opening time of the bypass valves are calculated by the multiphase flow simulation software OLGA. The timer controls the opening time of the bypass valves. The simulation calculation is highly accurate and scientific. For the cleaning of pipelines with multiple air inlets, the speed of the cleaning machine in different pipe sections is controlled, which alleviates the slug accumulation before the cleaning machine, ensures the safety of downstream equipment, and provides time for downstream liquid treatment. It is highly practical for guiding on-site cleaning operations.

[0017] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a cross-sectional view of the present invention.

[0020] Figure 2 This is a schematic diagram of the overall invention.

[0021] Figure 3 for Figure 1 and Figure 2 Sectional views of BB and AA in the diagram.

[0022] Figure 4 This is a front view of the time controller of the present invention.

[0023] In the diagram: 1. Valve seat; 2. Bolt; 3. Pressure plate; 4. Leather cup; 5. Nut; 6. Steel frame; 7. Signal transmitter; 8. Bypass valve; 9. Support component; 10. Time controller; 11. Select valve opening button; 12. Time setting button; 13. Time display screen. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0025] Example 1: according to Figures 1-4 The illustrated multi-manifold natural gas gathering and transmission pipeline timed speed-controlled pig includes a pig body, a valve seat 1, a bypass valve 8, a support member 9, and a timer 10. The support member 9 is connected to the inner wall of the pig body. One end of the support member 9 is connected to the valve seat 1, and the valve seat 1 is placed on one end face of the pig body. A bypass valve 8 is connected to the valve seat 1, and the number of bypass valves 8 is the same as the number of gas inlet points of the pipeline to be cleaned. A timer 10 is connected to the support member 9 for sequentially controlling the opening of the bypass valves 8 according to a set time.

[0026] In this embodiment, the number of bypass valves 8 is the same as the number of air inlets in the pipeline to be cleaned, which ensures that the speed of the pig can be controlled for different pipeline sections when cleaning the gathering and transmission pipeline with multiple air inlets. This alleviates the blockage and liquid accumulation in front of the pig, ensures the safety of downstream equipment, and buys time for downstream liquid treatment. It is highly practical for guiding on-site cleaning operations.

[0027] The timer 10 in this embodiment uses existing technology. Its housing includes at least a valve opening selection 11, a time setting button 12, and a time display screen 13 to facilitate the setting and display of time, and to facilitate the understanding and control of the cleaning time.

[0028] In some embodiments, a signal transmitter 7 and a signal receiver are also included; the signal transmitter 7 is connected to the support 9; the signal receiver is placed outside the pipe to be cleaned; the signal receiver is electrically connected to the signal transmitter 7.

[0029] In actual use, the signal transmitter 7 continuously sends out signals, and the signal receiver placed outside the pipeline to be cleaned receives the signals to determine the location of the timed speed control pig in the multi-manufacturer natural gas gathering and transmission pipeline, so as to avoid the timed speed control pig in the multi-manufacturer natural gas gathering and transmission pipeline being blocked in the pipeline to be cleaned and affecting production.

[0030] In some embodiments, the signal transmitter 7 is coaxially arranged with the steel frame 6. This arrangement improves the balance of the pig and ensures better signal transmission from the signal transmitter 7. In some embodiments, the pig body includes a pressure plate 3, a cup 4, and a steel frame 6; two sets of cups 4 are provided; the two sets of cups 4 are respectively connected to the outer periphery of both ends of the steel frame 6; the pressure plate 3 is connected to the cups 4 and is used to press the cups 4; the steel frame 6 is a hollow columnar structure; the support member 9 is connected to the inner wall of the steel frame 6.

[0031] Two sets of rubber cups 4 are provided; the two sets of rubber cups 4 are connected and fixed to the outer periphery of both ends of the steel frame 6 by bolts 2 and nuts 5 respectively. The function of the rubber cups 4 is to clean up accumulated liquid and dirt. The use of this technical solution for the rubber cups 4 makes the cleaning effect of the pig better.

[0032] In some embodiments, the support member 9 includes a clamping plate and a support plate; the clamping plate is connected to the inner wall of the steel frame 6 via the support plate; the clamping plate is used to clamp and fix the signal transmitter 7 and is fixedly connected to the valve seat 1. The support member 9 provides a stable connection and fixation between the signal transmitter 7 and the valve seat 1.

[0033] Example 2: according to Figures 1-4 The multi-manifold natural gas gathering and transmission pipeline timed speed control pig shown differs from Embodiment 1 in that it further includes a signal transmitter 7 and a signal receiver; the signal transmitter 7 is connected to the support member 9; the signal receiver is placed outside the pipeline to be cleaned; the signal receiver is electrically connected to the signal transmitter 7; the pig body includes a pressure plate 3, a cup 4, and a steel frame 6; two sets of cups 4 are provided; the two sets of cups 4 are respectively connected to the outer periphery of both ends of the steel frame 6; the pressure plate 3 is connected to the cups 4 and is used to press the cups 4; the steel frame 6 is a hollow columnar structure; the support member 9 is connected to the inner wall of the steel frame 6; the support member 9 includes a clamping plate and a support plate; the clamping plate is connected to the inner wall of the pig body through the support plate; the clamping plate is used to clamp and install the signal transmitter 7 and is fixedly connected to the valve seat 1.

[0034] In actual use, the signal transmitter 7 can also obtain its location information through human hearing, thereby determining the location of the timed speed control pig in the natural gas gathering and transmission pipeline, ensuring no blockage, and thus ensuring smooth production.

[0035] This invention features a simple structure and convenient operation. The number of bypass valves is determined by the number of air inlets. The bypass flow rate and valve opening time are calculated using the multiphase flow simulation software OLGA. A timer controls the valve opening time, resulting in high simulation accuracy and strong scientific validity. For pipeline cleaning with multiple air inlets, this invention enables control of the pig speed in different pipe sections, alleviating slug buildup before the pig, ensuring downstream equipment safety, and providing more time for downstream liquid treatment. It is highly practical for guiding on-site cleaning operations.

[0036] Example 3: A method for cleaning a multi-manufacturer natural gas gathering and transmission pipeline using a timed, speed-controlled pig includes the following steps: Step 1: Preparation for cleaning; The pipeline has n air inlets. The starting point is designated as the first air inlet, the next air inlet as the second air inlet, and so on. The pipe section between air inlet one and air inlet two is designated as the first pipe section, the pipe section between the second and third air inlets as the second pipe section, and so on. The bypass valve to be opened in pipe section one is designated as bypass valve one, the bypass valve to be opened in pipe section two is designated as bypass valve two, and so on. Then, the bypass valve opening times and the pig operation times are numbered. The opening time numbering method starts from time 2, which is the opening time of bypass valve 2, denoted as T2; the opening time of bypass valve 3 is time 3, denoted as T3; ..., the opening time of bypass valve n is time n, denoted as Tn, and so on. Bypass valve 1 is always in a fully open state and does not need to be opened at regular intervals. The pig operation time numbering method is to denot the operation time of pig in pipe segment 1 as t1, the operation time of pig in pipe segment 2 as t2, ..., the operation time of pig in pipe segment n-1 as tn-1; Step 2: Design the bypass flow rate of the bypass valve; The bypass capacity of the bypass valve is designed by using the multiphase flow OLGA software to simulate the bypass capacity of each pipe section under the conditions of satisfying the air intake volume and the maximum pigging speed. The bypass capacity is represented by φ. Step 3: Calculate the operating time of the pig in each pipe section; The method for calculating the operating time of the pig in each pipe segment is to input the basic parameters of the pipe segment, namely the air intake, pipe segment specifications, inlet and outlet pressures of the pipe segment, and bypass valve opening φ, into the multiphase flow OLGA software, and simulate the operating time of the pig in each pipe segment, which are denoted as t1, t2, ...; here, the time when the pig is placed in the pipeline and launched is denoted as t0, that is, after the pig is placed in the pipeline, it takes time t0 for it to be launched.

[0037] Step 4: Timer settings; The controller is set up starting from time 2, T2=t0+t1, T3=t0+t1+t2, ..., Tn=t0+t1+t2+...+tn-1, where t0 is the time when the pig is placed in the pipeline and launched, that is, after the pig is placed in the pipeline, it is launched after time t0.

[0038] Step 5: Pig Operation The specific operation process is as follows: at a preset time t0, the pig is sent into the pipeline to be cleaned. After t0, the pig is launched, and the timer starts timing. When the timer reaches the set time T2, which is the opening time of bypass valve two, gas flow is received at the second air inlet, and bypass valve two automatically opens fully. The pig runs at a predetermined speed in the second pipeline section, i.e., the section between the second and third air inlets. When the timer reaches the set time T3, which is the opening time of bypass valve three, gas flow is received at the third air inlet, and bypass valve three automatically opens fully. The pig runs at a predetermined speed in the third pipeline section. This process continues until the (n-1)th pipeline section has been completed at the predetermined speed. The opening degree of the bypass valve in the first pipe section is the opening degree φ1 of bypass valve one; the opening degree of the bypass valve in the second pipe section is the sum of the opening degrees of bypass valve one and bypass valve two, i.e., φ1+φ2; the opening degree of the bypass valve in the third pipe section is the sum of the opening degrees of bypass valve one, bypass valve two, and bypass valve three, i.e., φ1+φ2+φ3; ...; the opening degree of the bypass valve in the (n-1)th pipe section is the sum of the opening degrees of bypass valve one, bypass valve two, ..., bypass valve n-1 and bypass valve n, i.e., φ1+φ2+φ3+...+φn-1+φn, thus satisfying the control of the pig speed in different pipe sections under multiple air inlet points.

[0039] Example 4: There is a natural gas gathering and transmission pipeline with two intake points, φ508×8×18 (outer diameter mm×wall thickness mm×length km). Besides the first intake point, the second intake point is located 8 km into the pipeline. The gas volume at the first intake point is Q1 = 112 × 10⁴ cubic meters / day, and the gas volume at the second intake point is Q2 = 30 × 10⁴ cubic meters / day. 4 Units per day. Inlet pressure 2.4 MPa, outlet pressure 2.1 MPa. The pigging speed for the first section should not exceed 3 m / s, and the pigging speed for the second section should not exceed 4 m / s. When using pigging equipment, design the bypass valve opening degree and opening time for each section.

[0040] Step 1: Preparation The entire pipeline has two air inlets and two pipe sections.

[0041] Numbering: Intake point numbering: The starting point is designated as the first intake point, and the intake point 8km away is designated as the second intake point. Pipeline segment numbering: The pipeline segment between the first and second intake points is designated as the first pipeline segment, and the pipeline segment between the second intake point and the end point is designated as the second pipeline segment. Bypass valve numbering: The bypass valve to be opened in the first pipeline segment is called bypass valve one, and the bypass valve to be opened in the second pipeline segment is called bypass valve two. Since bypass valve one is always fully open, it does not need to be opened at a set time, but the bypass flow rate needs to be determined. Bypass valve opening time numbering starts from time 2; the opening time of bypass valve two is called time 2, denoted as T2. Pig operation time numbering: The pig operation time for the first pipeline segment is denoted as t1, the pig operation time for the second pipeline segment is denoted as t2, and the pig launch time is denoted as t0.

[0042] Step 2: Bypass Valve Bypass Capacity Design (1) Number of bypass valves: equal to 2 times the number of air inlet points; (2) Magnitude of bypass: The bypass of bypass valve one is denoted as φ1, and the bypass of bypass valve two is denoted as φ2.

[0043] Step 3: Calculate the operating time of the pig in each pipe section; A multiphase flow OLGA model of the pipeline is established based on known conditions. A pig is added, and basic parameters are input, assuming the pig's launch time is 30 minutes. The simulation calculates the pig speed for the first pipeline segment to be 3.2 m / s. A bypass valve is added to the pig; when the bypass flow is 1%, the pig speed is 3 m / s, satisfying the requirement that the pig speed for the first pipeline segment does not exceed 3 m / s, hence φ1 = 1%. At this point, the pig's running time for the first pipeline segment is t1 = 48 minutes, and t0 = 30 minutes.

[0044] The intake volume of the second pipe section is Q1 + Q2 = 142 × 10 4 With a daily bypass rate of 1% and a pig speed of 4.3 m / s, increasing the bypass rate to 5% results in a pig speed of 4 m / s. This satisfies the requirement that the pig speed for the second pipe section should not exceed 4 m / s, therefore φ2 = 5% - 1% = 4%. At this point, the pig's operating time for the second pipe section is t2 = 40 minutes.

[0045] In summary, φ1 = 1%, φ2 = 4%. Step 4: Timer Design From step two, we can get T2 = t0 + t1 = 30 + 48 = 78 minutes = 1 hour and 18 minutes. Adjust the time button to make T2 01:18.

[0046] Step 5: Pig Operation The pig is inserted into the pipeline to be cleaned, and at this time, the bypass valve of the pig is fully opened with a bypass flow rate of 1%. After 30 minutes, the pig is launched, and the timer starts timing. When the timer reaches the set time T2, which is 1 hour and 18 minutes, air flow begins to enter from the second air inlet, and the bypass valve automatically opens fully with a bypass flow rate of 4%. The pig then runs in the second pipeline section at a predetermined speed not exceeding 4 meters per second until the cleaning is completed.

[0047] During the pigging process, the opening degree of the bypass valve in the first pipeline section is the opening degree of bypass valve one, φ1=1%; the opening degree of the bypass valve in the second pipeline section is the sum of the opening degrees of bypass valve one and bypass valve two, i.e., φ1+φ2=1%+4%=5%. This satisfies the control of the pigging speed in different pipeline sections at two air inlet points.

[0048] Example 5: There are three gas intake points on the natural gas gathering and transmission pipeline, with dimensions φ610×7.5×54.5 (outer diameter mm×wall thickness mm×length km). Besides the first intake point, the second intake point is located at kilometer 20, and the third intake point is located at kilometer 38.5. The gas volume at the first intake point is Q1 = 100 × 10⁻⁶. 4 The volume of air at the second air intake point is Q2 = 60 × 10³ cubic meters per day. 4 The volume of air at the third air intake point is Q3 = 10 × 10³ / day. 4 Units per day. Inlet pressure 2.5 MPa, outlet pressure 2.2 MPa. The pigging speed for the first section should not exceed 1.5 m / s, and the pigging speed for the second and third sections should not exceed 2.5 m / s. When using pigging equipment, design the bypass valve opening degree and opening time for each section.

[0049] Step 1: Preparation The entire pipeline has 3 air inlets and 3 pipe sections.

[0050] Numbering: Intake point numbering: the starting point is designated as the first intake point, the intake point at 20km is designated as the second intake point, and the intake point at 38.5km is designated as the third intake point. Pipeline segment numbering: the pipeline segment between the first and second intake points is designated as the first pipeline segment, and the pipeline segment between the second and third intake points is designated as the second pipeline segment. Bypass valve numbering: the bypass valve to be opened in the first pipeline segment is called bypass valve one, the bypass valve to be opened in the second pipeline segment is called bypass valve two, and the bypass valve to be opened in the third pipeline segment is called bypass valve three. Since bypass valve one is always fully open, it does not need to be opened at a specific time, but the bypass flow rate needs to be determined. Bypass valve opening time numbering starts from time 2; the opening time of bypass valve two is called time 2, denoted as T2, and the opening time of bypass valve three is called time 3, denoted as T3. Pig operation time numbering: the pig operation time in the first pipeline segment is denoted as t1, the pig operation time in the second pipeline segment is denoted as t2, and the pig launch time is denoted as t0.

[0051] Step 2: Bypass Valve Bypass Capacity Design (1) Number of bypass valves: equal to the number of air inlet points, 3; (2) Magnitude of bypass: The bypass of bypass valve one is denoted as φ1, the bypass of bypass valve two is denoted as φ2, and the bypass of bypass valve three is denoted as φ3.

[0052] Step 3: Calculate the operating time of the pig in each pipe section. A multiphase flow OLGA model of the pipeline was established based on the known conditions. A pig was added, and the basic parameters were input, assuming the pig's launch time was 30 minutes. The simulation calculation showed that the maximum pig speed for the first pipeline segment was 1.66 m / s. A bypass valve was added to the pig. When the bypass volume was 3%, the maximum pig speed was 1.5 m / s, satisfying the requirement that the pig speed for the first pipeline segment not exceed 1.5 m / s. Therefore, φ1 = 3%. At this time, the pig's running time for the first pipeline segment was t1 = 208 minutes = 3 hours and 28 minutes, and t0 = 30 minutes.

[0053] The intake volume of the second pipe section is Q1 + Q2 = 160 × 10 4 With a daily bypass rate of 3%, the maximum pig speed is 2.54 m / s. When the bypass rate is increased to 4%, the maximum pig speed is 2.5 m / s. This satisfies the requirement that the pig speed for the second pipe section should not exceed 2.5 m / s, therefore φ2 = 4% - 3% = 1%. At this point, the pig's operating time for the second pipe section is t2 = 125 minutes = 2 hours and 5 minutes.

[0054] The intake volume of the third pipe section is Q1 + Q2 + Q3 = 170 × 10 4 With a daily bypass rate of 4%, the maximum pig speed is 2.69 m / s. When the bypass rate is increased to 8%, the maximum pig speed is 2.5 m / s. This satisfies the requirement that the pig speed for the third pipe section should not exceed 2.5 m / s. Therefore, φ3 = 8% - 4% = 4%. At this point, the pig's operating time for the third pipe section is t3 = 104 minutes = 1 hour and 44 minutes.

[0055] In summary, φ1=3%, φ2=1%, φ3=4%. Step 4: Timer Design From step two, we can obtain: T2 = t0 + t1 = 30 + 208 = 238 minutes = 3 hours 58 minutes; T3 = t0 + t1 + t2 = 30 + 208 + 125 = 363 minutes = 6 hours 3 minutes. Adjust the time button so that T2 is 03:58 and T3 is 06:03.

[0056] Step 5: Pig Operation The pig is inserted into the pipeline to be cleaned. At this time, the bypass valve one of the pig is fully open with a bypass flow rate of 3%. After 30 minutes, the pig is launched, and the timer starts timing. When the timer reaches the set time T2 (3 hours and 58 minutes), gas flows into the second air inlet, and the bypass valve two automatically opens fully with a bypass flow rate of 1%. The pig runs in the second pipeline section at a predetermined speed not exceeding 2.5 m / s. When the timer reaches the set time T3 (6 hours and 3 minutes), gas flows into the third air inlet, and the bypass valve three automatically opens fully with a bypass flow rate of 4%. The pig runs in the third pipeline section at a predetermined speed not exceeding 2.5 m / s until the cleaning is completed.

[0057] During the pigging process, the opening degree of the bypass valve in the first section is φ1=3% of the opening degree of bypass valve one; the opening degree of the bypass valve in the second section is the sum of the opening degrees of bypass valve one and bypass valve two, i.e., φ1+φ2=3%+1%=4%; the opening degree of the bypass valve in the third section is the sum of the opening degrees of bypass valve one, bypass valve two and bypass valve three, i.e., φ1+φ2+φ3=3%+1%+4%=8%. This satisfies the control of the pigging speed for different sections at three air inlet points.

[0058] Where there is no conflict, those skilled in the art can combine the relevant technical features in the above examples according to the actual situation to achieve the corresponding technical effects. Specific details of the various combinations will not be elaborated here.

[0059] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0060] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.

[0061] The above description is merely a preferred embodiment of the present invention. The present invention is not limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein. Any simple modifications, equivalent variations, and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the present invention.

Claims

1. A timed speed-controlled pipeline cleaning device for multi-manufacturer natural gas gathering and transmission pipelines, characterized in that: The system includes a pig body, a valve seat (1), a bypass valve (8), a support (9), and a timer (10). The support (9) is connected to the inner wall of the pig body. One end of the support (9) is connected to the valve seat (1), and the valve seat (1) is placed on one end face of the pig body. A bypass valve (8) is connected to the valve seat (1), and the number of bypass valves (8) is the same as the number of air inlets of the pipeline to be cleaned. A timer (10) is connected to the support (9) for sequentially controlling the opening of the bypass valves (8) according to a set time.

2. The timed speed-controlled pipeline cleaning device for multi-manufacturer natural gas gathering and transmission pipelines as described in claim 1, characterized in that: It also includes a signal transmitter (7) and a signal receiver; the signal transmitter (7) is connected to the support (9); the signal receiver is placed outside the pipe to be cleaned; the signal receiver is electrically connected to the signal transmitter (7).

3. The timed speed-controlled pipeline cleaning device for multi-manufacturer natural gas gathering and transmission pipelines as described in claim 2, characterized in that: The signal transmitter (7) is coaxially arranged with the pig body.

4. The timed speed-controlled pipeline cleaning device for multi-manufacturer natural gas gathering and transmission pipelines as described in claim 1, characterized in that: The pigging device body includes a pressure plate (3), a cup (4), and a steel frame (6); two sets of cups (4) are provided; the two sets of cups (4) are respectively connected to the outer periphery of both ends of the steel frame (6); the pressure plate (3) is connected to the cups (4) and is used to press the cups (4); the steel frame (6) is a hollow columnar structure; the support (9) is connected to the inner wall of the steel frame (6).

5. A timed speed-controlled pipeline cleaning device for multi-manufacturer natural gas gathering and transmission pipelines as described in claim 1, characterized in that: The support member (9) includes a clamping plate and a support plate; the clamping plate is connected to the inner wall of the pig body through the support plate; the clamping plate is used to clamp and install the signal transmitter (7) and is fixedly connected to the valve seat (1).

6. The timed speed-controlled pipeline cleaning device for multi-manufacturer natural gas gathering and transmission pipelines as described in claim 1, characterized in that: It also includes a signal transmitter (7) and a signal receiver; the signal transmitter (7) is connected to the support (9); the signal receiver is placed outside the pipeline to be cleaned; the signal receiver is electrically connected to the signal transmitter (7); the pig body includes a pressure plate (3), a cup (4) and a steel frame (6); two sets of cups (4) are provided; the two sets of cups (4) are respectively connected to the outer periphery of both ends of the steel frame (6); the pressure plate (3) is connected to the cup (4) and is used to press the cup (4); the steel frame (6) is a hollow columnar structure; the support (9) is connected to the inner wall of the steel frame (6); the support (9) includes a clamping plate and a support plate; the clamping plate is connected to the inner wall of the pig body through the support plate; the clamping plate is used to clamp and install the signal transmitter (7) and is fixedly connected to the valve seat (1).

7. The cleaning method for a timed speed-controlled pipe cleaning device for a multi-manufacturer natural gas gathering and transmission pipeline as described in claim 6, characterized in that: Includes the following steps, Step 1: Preparation for cleaning; There are n air inlets on the pipeline. The starting point is designated as the first air inlet, the next air inlet as the second air inlet, and so on. The pipe section between the first and second air inlets is designated as the first pipe section, the pipe section between the second and third air inlets is designated as the second pipe section, and so on. The bypass valve to be opened in the first pipe section is designated as bypass valve one, the bypass valve to be opened in the second pipe section is designated as bypass valve two, and so on. Then, the bypass valve opening time and the pig operation time are numbered. Step 2: Design the bypass flow rate of the bypass valve; Step 3: Calculate the operating time of the pig in each pipe section; Step 4: Timer settings; The running time of the pig in each pipe section, calculated in step three, is set on the timer. Step 5: Pig Operation After the pipeline pig is delivered to the pipe opening to be cleaned within the preset time, the pipeline pig is launched and the timer starts timing. According to the time set by the timer in step four, the corresponding bypass valve is opened, and the pipeline pig runs in the corresponding pipe section at a predetermined speed until it completes running at a predetermined speed in the (n-1)th pipe section.

8. The cleaning method for a timed speed-controlled pipe cleaning device for a multi-manufacturer natural gas gathering and transmission pipeline as described in claim 7, characterized in that: The method for numbering the bypass valve opening time in step one is to start from time 2, i.e., the opening time of bypass valve two, denoted as T2; the opening time of bypass valve three is time 3, denoted as T3; ..., the opening time of bypass valve n is time n, denoted as Tn, and so on. Bypass valve one is always in a fully open state and does not need to be opened at a time. The method for numbering the pig operation time is to denot the operation time of the first pipe section as t1, the operation time of the second pipe section as t2, ..., the operation time of the (n-1)th pipe section as tn-1. The method for setting the timer in step four is to start from time 2, T2=t0+t1, T3=t0+t1+t2, ..., Tn=t0+t1+t2+...+tn-1, where t0 is the time when the pig is placed in the pipeline and launched, that is, after time t0, the pig is launched.

9. The cleaning method for a timed speed-controlled pipe cleaning device for a multi-manufacturer natural gas gathering and transmission pipeline as described in claim 8, characterized in that: In step five, the specific process of the pig operation is as follows: at a preset time t0, the pig is sent to the inlet of the pipeline to be cleaned. After t0, the pig is launched, and the timer starts timing. When the timer reaches the set time T2, which is the opening time of bypass valve two, gas flows into the second air inlet, and bypass valve two automatically opens fully. The pig runs at a predetermined speed in the second pipeline segment, i.e., the section between the second and third air inlets. When the timer reaches the set time T3, which is the opening time of bypass valve three, gas flows into the third air inlet, and bypass valve three automatically opens fully. The pig runs at a predetermined speed in the third pipeline segment. This process continues until the pig has completed its operation at a predetermined speed in the (n-1)th pipeline segment. Accordingly, the opening degree of the bypass valve in the first pipe section is the opening degree φ1 of bypass valve one; the opening degree of the bypass valve in the second pipe section is the sum of the opening degrees of bypass valve one and bypass valve two, i.e., φ1+φ2; the opening degree of the bypass valve in the third pipe section is the sum of the opening degrees of bypass valve one, bypass valve two and bypass valve three, i.e., φ1+φ2+φ3; ...; the opening degree of the bypass valve in the (n-1)th pipe section is the sum of the opening degrees of bypass valve one, bypass valve two, ..., bypass valve n-1 and bypass valve n, i.e., φ1+φ2+φ3+...+φn-1+φn, thereby satisfying the control of the pig speed in different pipe sections under multiple air inlet points.

10. The cleaning method of a timed speed-controlled pig for a multi-manufacturer natural gas gathering and transmission pipeline as described in claim 7, characterized in that: The specific method for designing the bypass valve's bypass capacity in step two is to use multiphase flow OLGA software to simulate the bypass capacity of each pipe segment under the conditions of air intake and maximum pig speed. This bypass capacity is represented by φ. The method for calculating the pig's running time in each pipe segment in step three is to input the basic parameters of the pipe segment, namely air intake, pipe segment specifications, inlet and outlet pressures, and bypass valve opening φ, into the multiphase flow OLGA software. The running time of the pig in each pipe segment is simulated and calculated, denoted as t1, t2, ... Here, the pig's insertion and launch time in the pipeline is denoted as t0, which is the time after the pig is inserted into the pipeline and launched.

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