CN109013586B - Segmented pipe cleaning system and method for gathering and conveying pipeline - Google Patents
Segmented pipe cleaning system and method for gathering and conveying pipeline Download PDFInfo
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- CN109013586B CN109013586B CN201810995663.XA CN201810995663A CN109013586B CN 109013586 B CN109013586 B CN 109013586B CN 201810995663 A CN201810995663 A CN 201810995663A CN 109013586 B CN109013586 B CN 109013586B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
- B08B9/027—Cleaning the internal surfaces; Removal of blockages
- B08B9/04—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes
- B08B9/053—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes moved along the pipes by a fluid, e.g. by fluid pressure or by suction
- B08B9/057—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes moved along the pipes by a fluid, e.g. by fluid pressure or by suction the cleaning devices being entrained discrete elements, e.g. balls, grinding elements, brushes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B13/00—Accessories or details of general applicability for machines or apparatus for cleaning
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Abstract
The invention discloses a collection and transportation pipeline sectionalized pipe cleaning system and a method, wherein the system comprises at least one middle pipe cleaning system arranged along a collection and transportation trunk line; the intermediate pig system includes a main pig stay/send system, a large bypass system, a pig indication system, and a logic control system. Compared with the prior art, the invention has the following positive effects: the invention is based on the analysis of the effusion and slug load process, and adopts a sectional pipe cleaning mode to digest the pipeline slug flow; through the reverse-order pipe cleaning, the volume of the pipeline after the downstream pipe cleaning in advance is utilized to the maximum extent to realize upstream liquid receiving, so that the end point slug flow load is reduced, and the large-scale slug flow catcher is prevented from being expanded; the pipe cleaning system has simple structure, compared with the conventional pipe cleaning station, the scheme can save a ball collecting cylinder, a ball sending cylinder and auxiliary facilities of the pipe cleaner, and has advantages in large-caliber and high-pressure pipeline engineering projects.
Description
Technical Field
The invention relates to a segmented pipe cleaning system and method for a gathering and transportation pipeline.
Background
With the improvement of the development requirements of gas fields on landing, the characteristics of long distance, large pipe diameter, high pressure and the like of the gathering and transportation trunk pipeline tend to be more obvious. The gas field gathering and transportation pipeline generally adopts a gas-liquid mixing and transportation mode, and the problem of pipeline hydrops is unavoidable along with relief. The pipeline hydrops are affected by various factors, and mainly comprise pipeline delivery, medium gas-liquid ratio, pipeline topography condition and the like. Particularly, for mixed transportation pipelines at the initial stage and the final stage of production, in low-delivery-capacity production lifting, low-delivery-capacity pipe cleaning or full-line intelligent detection, accumulated liquid in the pipelines can be induced to form slugging flow to a treatment plant or a gas collecting station at the tail point of the pipelines; if the downstream slug capturing device and the liquid phase processing device cannot meet the receiving capability of the instantaneous large-scale slug, a large influence may be caused on the production (for example, the liquid phase enters a gas processing system or the whole plant stops production); and the newly built (expanded) receiving device meeting a large number of slug flow capturing loads generally has huge cost. Therefore, a proper pipeline cleaning or slug flow trapping system and a scheme are provided, and the safety and economical operation of the gathering and conveying system and the treatment system are greatly influenced.
At present, the slug quantity generated in the gathering and transportation pipeline under different working conditions can be intuitively calculated through commercial process analysis software, and the corresponding slug flow processing method mainly comprises the following steps: 1) Regular pipe cleaning is carried out, so that the accumulated liquid in the pipeline does not exceed the downstream slug flow trapping capacity; 2) The downstream slug flow trapping device is expanded, the trapping capacity of the tail end slug flow is improved, and the trapping capacity is ensured to be matched with the slug flow volume caused by the actual working condition; 3) By adopting bypass type pipe cleaning equipment, the pipe cleaning liquid pushing-out amount time is prolonged, and the peak load of downstream slug processing facilities is slowed down; 4) And an intermediate pipe cleaning station is arranged to perform section-by-section pipe cleaning, so that the end point slug flow load is reduced. The above methods have respective usage characteristics and limitations: the accumulated liquid in the pipeline can be controlled theoretically by regular pipe cleaning, but the problems of higher operation and maintenance cost, increased operation risk and the like exist in frequent pipe cleaning, and certain deviation exists in the calculation of the pipe cleaning period; although the expansion downstream slug flow catcher can solve the problem of extreme slug flow load in theory, the engineering investment is extremely high, the equipment use frequency is relatively low, and the cost performance is not high; the bypass type pipe cleaning has the minimum flow rate requirement in the actual operation process, and in low-speed operation, the problems of ball blocking and the like can occur, so that the operation risk is greater than that of a common pipe cleaning mode; the section-by-section pigging needs to be provided with an intermediate pigging station (with a ball receiving and transmitting cylinder), so that the equipment is more, the investment is higher, the management requirement is high, and the problem of relatively low use frequency exists.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a segment pipe cleaning system and a segment pipe cleaning method for a gathering and transportation pipeline, which are based on the distribution of accumulated liquid in the pipeline and the formation rule of segment plug flow, from the angles of reducing the peak value of the segment plug flow, prolonging the time of the segment plug flow entering downstream equipment and segment processing the segment plug flow, the pipe cleaning and segment plug flow control of the gathering and transportation pipeline is implemented by the reverse sequence pipe cleaning principle (by utilizing the volume of a downstream emptying pipe segment and receiving the liquid cleaning liquid of a part of an upstream pipe segment), and meanwhile, the gathering and transportation of the pipe cleaner without a ball receiving and transporting cylinder is realized by means of reducing the inner diameter of the pipeline, buffering the accumulated liquid of the downstream, disassembling the pipe segment and the like, so that the ball receiving cylinder and the ball serving cylinder of the pipe cleaner with higher investment are replaced.
The technical scheme adopted by the invention is as follows: a gathering pipeline subsection pigging system, comprising at least one intermediate pigging system arranged along a gathering trunk; the intermediate pig system includes a main line pig stay/send system, a large bypass system, a pig indication system, and a logic control system, wherein:
the main line pig stay/send system comprises an upstream reducing barrier tee joint, an upstream main line ball valve, an upstream main line pressure transmitter, a first-stage thick-wall pipe joint, a second-stage thick-wall pipe joint, a third-stage ball-sending pipe joint, a downstream main line pressure transmitter, a downstream main line ball valve and a downstream reducing barrier tee joint which are sequentially connected to a gathering and conveying trunk line, an air-entraining/ball-sending control bypass arranged across the upstream main line ball valve and an air-entraining/ball-receiving control bypass arranged across the downstream main line ball valve;
the large bypass system comprises a bypass upstream ball valve connected to the upstream reducing stop strip tee joint, a bypass upstream pressure transmitter, a bypass regulating valve, a bypass downstream pressure transmitter and a bypass downstream ball valve connected to the downstream reducing stop strip tee joint;
the pig indicator system includes pig pass indicators mounted on the upstream trunk, downstream trunk, and trunk pig stop/send systems, respectively;
the logic control system comprises a pressure transmitter, a pipe cleaner through indicator signal collecting and processing system and a ball valve/regulating valve linkage control system.
The invention also provides a sectional pipe cleaning method for the gathering and transportation pipeline, which comprises the following steps:
(1) When the pipeline normally operates, all main pipeline cleaner staying/transmitting systems of the whole pipeline are started, the second-stage thick-wall pipe joint is replaced by a conventional pipe joint, the large bypass system is closed, and a medium is connected into a downstream pipeline from an upstream pipeline through the main pipeline cleaner staying/transmitting system;
(2) When pigging, the last section of pipeline of the trunk line is pigged firstly: introducing a corresponding middle pipe cleaning system flow into a large bypass system, closing a main pipeline valve of a main pipeline cleaner stay/delivery system, diffusing a pipeline between replacement valves, after a conventional pipe joint is disassembled, placing the pipe cleaner into the second half part of a second-stage thick-wall pipe joint, installing the pipe cleaner on a main pipeline, after a tightness test, sequentially opening a main pipeline ball valve bypass and a second-stage thick-wall pipe joint bypass, establishing the upstream and downstream balance pressure of a ball valve, opening a downstream main pipeline ball valve, reducing the opening of a bypass regulating valve, and opening the upstream main pipeline ball valve to realize service; after the downstream pipe cleaning indicator sends out a signal, all valves of the large bypass system are closed, and all bypass valves of the trunk line are closed;
(3) Continuing to perform pipeline cleaning on the last second section of pipeline of the trunk line according to the same installation and sending mode of the pipeline cleaner as the step (2): before the pipe cleaner enters the middle pipe cleaning system, after passing through the first pipe cleaning indicator, the downstream trunk ball valve is closed, the bypass system of the ball valve is opened, the opening degree of the bypass regulating valve of the large bypass system is reduced, the ball valve of the large bypass system is opened, and after sequentially passing through the reducing barrier tee joint, the pressure transmitter, the regulating valve and the second pipe cleaning indicator, the pipe cleaner enters the first half part of the second-stage thick-wall pipe joint; closing an upstream trunk ball valve and a bypass pipeline thereof, closing a downstream ball valve bypass pipeline, diffusing and replacing an isolation section medium by means of a gas diffusing and replacing pipeline, a liquid diffusing pipeline and a second-stage thick-wall pipe joint bypass pipeline, then disassembling the second-stage thick-wall pipe joint, and finishing ball collection.
Compared with the prior art, the invention has the following positive effects:
the invention is based on the analysis of the effusion and slug load process, and adopts a sectional pipe cleaning mode to digest the pipeline slug flow; through the reverse-order pipe cleaning, the volume of the pipeline after the downstream pipe cleaning in advance is utilized to the maximum extent to realize upstream liquid receiving, so that the end point slug flow load is reduced, and the large-scale slug flow catcher is prevented from being expanded; the pipe cleaning system has simple structure, compared with the conventional pipe cleaning station, the scheme can save a ball collecting cylinder, a ball sending cylinder and auxiliary facilities of the pipe cleaner, and has advantages in large-caliber and high-pressure pipeline engineering projects. The concrete steps are as follows:
(1) Setting science
The invention reasonably sets the position and the number of the pipe cleaning system based on the advanced process simulation analysis result, divides the accumulated liquid in the pipeline which finally accumulated into the downstream catcher into a plurality of gas entraining and a small quantity of one-time slugs through the sectional pipe cleaning operation, and the accumulated liquid pushing-out volume generated before the pipe cleaner carries out the final section of pipe cleaning on the pipeline can relatively uniformly enter the catcher in the form of the last section of pipe section through the gas stream entraining, and has longer digestion time; and the liquid accumulation volume of the last section of pipeline is matched with the processing capacity of the catcher, so that the downstream catcher and other devices can be ensured to normally operate in the whole process of cleaning the pipe.
(2) Good economical efficiency
The main pipeline cleaning system provided by the invention has the advantages that the structure is simple, the functions are clear, the speed and the speed of the entering pipeline cleaner are reduced and the entering pipeline cleaner is emitted slowly by utilizing the change of the inner diameter of a special pipeline and the air flow distribution, the ball collecting cylinder and the ball sending cylinder of the pipeline cleaner can be replaced, and meanwhile, the large-scale slug flow catcher is prevented from being built downstream through the liquid accumulation capacity of the pipeline.
(3) The operation is safe: the main pipeline cleaner staying/transmitting system is opened for the operation working condition, and the conventional pipe joint is adopted to replace the second-stage thick-wall pipe joint in normal operation, so that the pressure loss is avoided; the disassembling part is provided with a venting and replacing system, so that the safety of the operation process is ensured.
(4) The switching is flexible: the main pipeline cleaner staying/sending system can be replaced by a main pipeline with equal inner diameter when the pipeline normally operates, so that the spherical pig can directly pass through the main pipeline cleaner, and the operation times are reduced.
Drawings
The invention will now be described by way of example and with reference to the accompanying drawings in which:
FIG. 1 is a schematic distribution diagram of a segmented pig system of the present collection and delivery pipeline;
fig. 2 is a schematic flow diagram of a subsystem (intermediate pig system) of the present collection and delivery pipeline segment pig system.
Detailed Description
A segmented pig system for a collection and delivery pipeline, as shown in figures 1 and 2,
the overall system comprises: a first station A, an intermediate pipe cleaning system 1#, an intermediate pipe cleaning system 2#, … …, an intermediate pipe cleaning system n# and a last station B; the intermediate pipe cleaning system is a line intermediate system which is arranged according to the process and the economic ratio and is used for reducing the load of the disposable long-distance pipe cleaning slug, cleaning the pipe at the downstream and cleaning the pipe at the upstream.
Each intermediate pig system is a separate subsystem comprising: an upstream inbound pipe 1, an upstream reducing barrier tee 2, an upstream trunk ball valve 3, a first stage thick-wall pipe joint 4, a second stage thick-wall pipe joint 5, a third stage service pipe joint 6, a downstream trunk ball valve 7, a downstream reducing barrier tee 8, a downstream outbound pipe 9, a trunk pressure transmitter 10/11, a bypass ball valve 12/14/17/19/22/24, a bypass regulating valve 13/18/23, a gas bleed-off replacement valve 15/20, a liquid bleed-off valve 16/21, a bypass upstream ball valve 31, a bypass regulating valve 32, a bypass downstream ball valve 33, a bleed-off replacement valve 34/37, a pressure transmitter 35/36, a bypass regulating valve 38/40, a bypass regulating valve 39, a pig pass indicator.
The bypass ball valve 12, the bypass regulating valve 13 and the bypass ball valve 14 form an upstream trunk ball valve bypass system; the bypass ball valve 17, the bypass regulating valve 18 and the bypass ball valve 19 form a second-stage thick-wall pipe joint bypass system; the bypass ball valve 22, the bypass regulating valve 23 and the bypass ball valve 24 form a downstream trunk ball valve bypass system; the upstream trunk ball valve bypass system, the second-stage thick-wall pipe joint bypass system, the downstream trunk ball valve bypass system, the upstream reducing baffle three-way 2, the upstream trunk ball valve 3, the first-stage thick-wall pipe joint 4, the second-stage thick-wall pipe joint 5, the third-stage ball-serving pipe joint 6, the downstream trunk ball valve 7, the downstream reducing baffle three-way 8, the downstream outlet pipeline 9, the trunk pressure transmitter 10/11, the gas diffusing displacement valve 15/20 and the liquid diffusing valve 16/21 form a trunk cleaner residence/sending system. The main pipeline pig staying/sending system is a pig receiving and sending system without a pig receiving and sending ball barrel, receives and extracts the pig through the combined action of the regulating valve, the first-stage thick-wall pipe joint and the second-stage thick-wall pipe joint, and installs and sends the pig through the combined action of the regulating valve, the second-stage thick-wall pipe joint and the third-stage ball sending pipe joint. The first-stage thick-wall pipe joint is horizontally installed, two ends of the first-stage thick-wall pipe joint are connected with flanges and are detachable, one end of the first-stage thick-wall pipe joint is connected with an upstream trunk line, one end of the first-stage thick-wall pipe joint is connected with the second-stage thick-wall pipe joint, the outer diameter of the first-stage thick-wall pipe joint is consistent with the upstream trunk line and the downstream trunk line, the inner diameter of the first-stage thick-wall pipe joint is smaller than the trunk line (customized according to the interference of a pipe cleaner), the groove angle of the inner side pipe wall is 15 degrees, the pipe cleaner gradually thickens from upstream to downstream, the impact force of the pipe cleaner is buffered, the length of the pipe joint is not smaller than 10m, and the friction and deceleration of a cleaning ball are performed on the upstream; the second-stage thick-wall pipe joint is horizontally installed, two ends are in flange connection and can be detached, one end of the second-stage thick-wall pipe joint is connected with the first-stage thick-wall pipe joint, one end of the second-stage thick-wall pipe joint is connected with the third-stage ball-serving pipe joint, the outer diameter of the second-stage thick-wall pipe joint is consistent with that of an upstream trunk line and a downstream trunk line, the inner diameter of the second-stage thick-wall pipe joint is in a double-bell mouth type with large ends and small middle, the length of the second-stage thick-wall pipe joint meets the size requirement of the pipe cleaner, the second-stage thick-wall pipe joint is a collecting area of the upstream pipe cleaner and a transmitting area of the downstream pipe cleaner, and when intelligent pipe cleaning is conducted on the whole line, the second-stage thick-wall pipe joint can be detached and replaced by an equal-diameter pipe joint consistent with the trunk line pipeline specification, and the intelligent pipe cleaner can pass through directly conveniently; the third-stage ball-serving pipe joint is characterized in that two ends of the third-stage ball-serving pipe joint are in flange connection and detachable, one end of the third-stage ball-serving pipe joint is connected with the second-stage thick-wall pipe joint, one end of the third-stage ball-serving pipe joint is connected with the downstream trunk line, the outer diameter of the third-stage ball-serving pipe joint is consistent with that of the upstream trunk line and that of the downstream trunk line, and the third-stage ball-serving pipe joint is a passing area of the pipe cleaner during ball-serving operation. The gas replacement diffusing pipeline is a pipeline which is vertically and upwards arranged and a ball valve 15/20, and the ball valve is matched with a single valve or a double valve according to the pressure requirement; the liquid diffusing pipeline is a pipeline which is vertically downwards arranged and a ball valve 16/21, and the ball valve is matched with a single valve or a double valve according to the pressure requirement; the gas replacement diffusing pipeline and the liquid diffusing pipeline are matched with the pressure transmitter value, so that the detachable reducer pipe joint and the pigging ball are safely detached and reinstalled; the upstream trunk ball valve bypass system is an air-entraining/ball-launching control bypass crossing the upstream trunk ball valve 3, is a small-caliber ball valve 12+a regulating valve 13+a ball valve 14 bypass, is electrically controlled by the regulating valve, is horizontally arranged in parallel with the trunk, and plays a role in introducing a fluid purging pipeline and assisting the trunk ball valve to start pushing a pipe cleaner to launch balls when the pipe cleaner receives; the downstream trunk ball valve bypass system is an air-entraining/ball-collecting control bypass crossing the downstream trunk ball valve 7, is a small-caliber ball valve 22+an adjusting valve 23+a ball valve 24 bypass, is electrically controlled by the adjusting valve, is horizontally arranged in parallel with the trunk, and plays roles of opening and adjusting the air-entraining balance pressure when a pipe cleaner receives the air, stopping the fluid discharge of a cut-off section after the pipe cleaner stops and sending the pipe cleaner; the second-stage thick-wall pipe joint bypass system is a balance/purge bypass crossing the second-stage thick-wall pipe joint 5, is a pipeline of a small-caliber ball valve 17+a regulating valve 18+a ball valve 19, is manually controlled, is opened below a main line, crosses at a low point, and plays a role in balancing upstream and downstream pressure before a pipe cleaner stops to be taken out and balancing upstream and downstream pressure before the pipe cleaner is sent out; the trunk pressure transmitter 10/11 is arranged between the trunk ball valve and the second-stage thick-wall pipe joint, and is 2 in number and is responsible for monitoring and uploading the pressure in the isolation pipe section.
The bypass ball valve 38/40 and the bypass regulating valve 39 form a bypass ball valve bypass system, and the bypass ball valve bypass system, the bypass upstream ball valve 31, the bypass regulating valve 32, the bypass downstream ball valve 33, the bleeding replacement valve 34/37 and the pressure transmitter 35/36 form a large bypass system. The large bypass system is a temporary medium channel for receiving and sending balls and overhauling the main line system; the pipeline and the valve are made of the same material as the upstream trunk line and the downstream trunk line, the pipe diameter is formulated according to specific working conditions, and the flow speed is higher than that of the trunk line system; the bypass regulating valve and the ball valve are electrically controlled and are used for regulating bypass gas transmission quantity and controlling ball receiving and sending processes of the spherical pig in the main pipeline pig stay/send system; the bypass ball valve bypass system is a bypass adjusting/balancing pipeline crossing the bypass ball valve 33, is a small-caliber ball valve 38+an adjusting valve 39+a ball valve 40 pipeline, is manually controlled by an adjusting valve, is horizontally arranged in parallel with a trunk line, and plays a role in balancing the upstream pressure and the downstream pressure of the bypass ball valve; the replacement bleeding pipeline is a pipeline which is vertically upwards arranged and a ball valve 34/37, and the ball valve is matched with a single valve or a double valve according to the pressure requirement; the pressure transmitters 35/36 are installed between the bypass ball valves 31/33 and the bypass regulating valve 32, and are 1 in number and are responsible for monitoring and uploading the pressure in the isolation pipe section.
Wherein the pig constitutes a pig indication system by means of an indicator. The number of the tube cleaner indication systems is 3, and the tube cleaner is indicated to reach the second-stage thick-wall system besides the tube cleaner entering and exiting the middle tube cleaning system, and is uploaded to the logic control system through signals.
In the system, an upstream inbound pipeline 1 is horizontally installed in a dew state, is connected with an upstream reducing barrier tee joint 2, and is used for avoiding the blocking and guiding of a pipe cleaner, and the reducing barrier tee joint 2 is used for shunting a medium; an upstream trunk ball valve 3, a first-stage thick-wall pipe joint 4, a second-stage thick-wall pipe joint 5, a third-stage ball serving pipe joint 6, a downstream trunk ball valve 7 and a downstream reducing stop tee 8 are sequentially arranged along one side of a main channel of the reducing stop tee 2; the upstream trunk ball valve 3 is a full-diameter ball valve, is electrically controlled, is opened during normal operation, and is closed during disassembly and installation of the second-stage thick-wall pipe joint 5; the first-stage thick-wall pipe joint 4 is thicker than the wall thickness of the main pipeline and has 15-degree thickening gradient, and is used for friction deceleration after the pipe cleaner enters; the second-stage thick-wall pipe joint 5 is of a special structure, the outer diameter of the second-stage thick-wall pipe joint is consistent with that of an upstream trunk line and a downstream trunk line, the inner diameter of the second-stage thick-wall pipe joint is in a double-bell mouth type with large two ends and small middle, and the second-stage thick-wall pipe joint is a collecting area of an upstream pipe cleaner and a transmitting area of a downstream pipe cleaner, and can be detached and replaced by an equal-diameter pipe joint consistent with the specification of the trunk line pipeline when intelligent pipe cleaning is carried out on the whole line, so that the intelligent pipe cleaner can conveniently and directly pass through the pipe cleaner; the third-stage service pipe section 6 is a passing area of the pipe cleaner during service operation; the downstream main line ball valve 7 is a full-diameter ball valve, is electrically controlled, is opened during normal operation, is closed after the first pipe cleaning indicator 41 detects that the pipe cleaner passes, is closed during disassembly and installation of the second-stage thick-wall pipe joint 5, and is opened again during ball service operation; an upstream trunk ball valve bypass system consisting of a bypass ball valve 12, a bypass regulating valve 13 and a bypass ball valve 14 is arranged on the upstream trunk ball valve 3, the bypass system is horizontally arranged in parallel with the trunk, and plays a role in introducing a fluid purging pipeline and assisting the trunk ball valve to start pushing a pig to launch balls when the pig is received, the bypass regulating valve 12 is electrically controlled, and the bypass ball valve 12/14 is manually controlled; a pressure transmitter 10 is installed immediately downstream of the upstream trunk ball valve 3; the tail end of the first-stage thick-wall pipe joint 4 is opened and is provided with a second pigging indicator 25; the first-stage thick-wall pipe joint 4 and the third-stage ball-serving pipe joint 6 are opened and are provided with a gas replacement diffusing pipeline (ball valve 15/20) and a liquid diffusing pipeline (ball valve 16/21) for diffusing and replacing media of the disassembly section and the assembly section; the downstream main line ball valve bypass system consisting of the bypass ball valve 22, the bypass regulating valve 23 and the bypass ball valve 24 is arranged on the downstream main line ball valve 7, the bypass system is horizontally arranged in parallel with the main line, and is started and regulated to perform the functions of the overair amount when the pipe cleaner is received, the fluid discharge of the cut-off section after the pipe cleaner stops and the air entraining balance pressure in the direction when the pipe cleaner is sent, the bypass regulating valve 23 is electrically controlled, and the bypass ball valve 22/24 is manually controlled; a balance/purge bypass consisting of a bypass ball valve 17, a bypass regulating valve 18 and a bypass ball valve 19 is installed upstream and downstream of the second stage thick-walled pipe joint 5 for balancing the internal pressures of the first stage thick-walled pipe joint 3 and the third stage service pipe joint 5 after the pig is received and before it is sent.
In the system, a large bypass system is laid in the open air, is horizontally arranged in parallel with a trunk line and is connected with a reducing barrier strip tee joint 2/8. The bypass pipeline is sequentially provided with a bypass upstream ball valve 31, a bypass regulating valve 32 and a bypass downstream ball valve 33, which are electrically controlled, and the bypass pipeline is closed in normal operation, and the first pipe cleaning indicator 41 is opened after sending a pipe cleaning ball passing signal; the opening of the bypass regulating valve 32 is controlled by a logic control system and is matched with the bypass regulating valve 23; the bypass downstream ball valve 33 is provided with a bypass ball valve bypass system consisting of bypass ball valves 38/40 and a bypass regulating valve 39, and is used for balancing pipeline and trunk pipeline pressures between the bypass upstream ball valve 31 and the bypass downstream ball valve 33; the piping between the bypass upstream ball valve 31, the bypass regulator valve 32 and the bypass downstream ball valve 33 is open and a pressure transmitter 35/36 and a bleed-off replacement valve 34/37 are installed.
In the system shown, a first pig indicator 41 is mounted to the upstream trunk pipeline 1, which may take the form of a clamp, to detect and indicate the pig entry condition; the downstream pipe cleaning indicator 42 is arranged on the downstream main pipeline 9 and can adopt a clamping type mode to detect and indicate the outlet condition of the pipe cleaner; further comprising said second pig indicator 25; the pig is uploaded to the logic control system by an indicator detection signal.
The logic control system can collect signals of the pipe cleaner passing through the indicator, the pressure transmitter and the valve position, send action signals to execution structures of the regulating valve and the ball valve, and assist in completing the operation of receiving and sending the pipe cleaner.
The working principle and the working process of the invention are as follows:
(1) Under normal transport, the media passes sequentially through the intermediate pig and collector rails from upstream to downstream, into the downstream end station.
(2) In order to improve the cleaning efficiency, the capability of the cleaned pipeline to receive the upstream cleaning liquid amount is utilized, the pipeline is subjected to reverse-order sectional cleaning, namely cleaning of the downstream pipeline is firstly carried out, then cleaning is carried out on the upstream pipeline by utilizing the cleaning condition of the downstream pipeline, part of cleaning liquid slugs stay in the downstream pipeline, and the load of the tail end slug flow catcher is reduced. When the pipe cleaning operation is prepared, the accumulated liquid of the pipeline under the operation working condition is calculated through process analysis, the maximum end slug flow load of the whole system under different middle pipe cleaning system operations is analyzed, and the volume of the end slug flow is reduced by means of the liquid space reserved by the sectional pipe cleaning and downstream preceding pipe cleaning pipeline. By analysis, an operating strategy is determined, and for a pipeline in which there are multiple pig systems, an intermediate pig system that requires pig service, ball collection and an intermediate pig system for direct ball passing are selected.
(3) When the last intermediate pipe cleaning system performs pipe cleaning and ball launching operation, the main pipeline cleaner staying/sending system of each upstream intermediate pipe cleaning system is started, and the large bypass system is closed; the main pig stay/launch system of the intermediate pig system where the service is performed is closed and the large bypass system is opened. The pig is placed in the second stage thick-walled pipe joint 5, the second stage thick-walled pipe joint 5 is installed, and after pressure-approved pressure testing, the pig is sent through the upstream trunk ball valve 3 and the downstream trunk ball valve 7.
(4) The pig pushes the liquid product in the downstream pipeline into the end trapping system and the downstream pipeline is emptied.
(5) And continuing to serve the ball at the penultimate position, and collecting the ball by the pigging system at the penultimate position. The principle of serving is described in (3). When the pipe cleaner enters the first-last pipe cleaning system, the large bypass system is opened, the downstream trunk ball valve of the trunk pipe cleaner staying/transmitting system is closed, the rest valves are kept, the overcurrent of the trunk pipe cleaner staying/transmitting system is reduced, the overcurrent of the large bypass system is increased, the pipe cleaner is decelerated under the influence of the trunk flow, the first-stage thick-wall pipe joint and the upstream effusion of the downstream trunk valve, and finally the pipe cleaner stays in the first half section of the second-stage thick-wall system. And then closing the bypass system of the upstream trunk valve and the downstream trunk valve, isolating the trunk from the first-stage thick-wall pipe joint, the second-stage thick-wall pipe joint and the third-stage ball-serving pipe joint, and diffusing, replacing, disassembling and taking balls. The liquid pushed out of the secondary pig resides partially in the downstream emptied tube segment and partially into the end capture system.
(6) According to the principles (3) - (5), the full-line sectional pipe cleaning is realized.
The method for cleaning the pipe by utilizing the sectional pipe cleaning system of the gathering and conveying pipeline comprises the following steps:
step one: for the established pipeline projects, according to the pipeline accumulated liquid and the pipeline cleaning slug process analysis results, the quantity of the middle pipeline cleaning systems increased by modification is set by combining the end station slug flow capturing capability; in order to improve the cleaning efficiency, the capability of the cleaned pipeline to receive the upstream cleaning liquid amount is utilized, the pipeline is subjected to reverse-order sectional cleaning, namely cleaning of the downstream pipeline is firstly carried out, then cleaning is carried out on the upstream pipeline by utilizing the cleaning condition of the downstream pipeline, part of cleaning liquid slugs stay in the downstream pipeline, and the load of the tail end slug flow catcher is reduced.
Step two: for a newly-built pipeline project, comprehensively considering investment of a newly-built intermediate pipe cleaning system and a final station slug flow capturing system according to pipeline accumulated liquid and a pipe cleaning slug process analysis result, fully considering economy and functionality, and setting the increased number of the intermediate pipe cleaning systems and the capacity of the final station slug flow capturing system; in order to improve the cleaning efficiency, the capability of the cleaned pipeline to receive the upstream cleaning liquid amount is utilized, the pipeline is subjected to reverse-order sectional cleaning, namely cleaning of the downstream pipeline is firstly carried out, then cleaning is carried out on the upstream pipeline by utilizing the cleaning condition of the downstream pipeline, part of cleaning liquid slugs stay in the downstream pipeline, and the load of the tail end slug flow catcher is reduced.
Step three: when the pipeline normally operates, all main pipeline cleaner staying/transmitting systems of the whole pipeline are started, and the second-stage thick-wall pipe joint is replaced by a conventional pipe joint, so that pressure loss is reduced; the large bypass system is closed and the media is accessed from the upstream pipeline to the downstream pipeline via the main pig stop/send system.
Step four: when cleaning the pipe, the last section of pipeline of the main line is cleaned. Specifically, the corresponding middle pipe cleaning system flow is led into a large bypass system, a main pipeline valve of a main pipeline cleaner stay/delivery system is closed, a pipeline between the valves is diffused and replaced, after a conventional pipe joint is disassembled, the pipe cleaner is placed in the second half part of a second-stage thick-wall pipe joint and is installed on a main pipeline, after tightness is tested in an operation permission mode, a main pipeline ball valve bypass and a second-stage thick-wall pipe joint bypass are sequentially opened, the upstream and downstream balance pressure of a ball valve is established, a downstream main pipeline ball valve is opened, the opening of a large bypass regulating valve is reduced, and an upstream main pipeline ball valve is opened, so that ball service is realized; after the downstream pig indicator 42 signals, all valves of the large bypass system are closed, and all bypass valves of the trunk are closed.
Step five: and continuing to clean the pipeline of the last second section of the trunk line. And fourthly, installing and sending the pipe cleaner. Before the pipe cleaner enters the middle pipe cleaning system, after passing through the first pipe cleaning indicator 41, the downstream trunk ball valve is closed, the bypass system of the ball valve is opened, the opening degree of the bypass regulating valve of the large bypass system is reduced, the ball valve of the large bypass system is opened, after the pipe cleaner passes through the reducing barrier tee joint, the pipe cleaner is influenced by the reduction of the gas quantity of the entering trunk, the friction of the first-stage thick-wall pipe joint, the front accumulated liquid of the downstream trunk ball valve and the like, the speed is reduced, the action of the valve is detected and regulated through the pressure transmitter, and the pipe cleaner enters the first half part of the second-stage thick-wall pipe joint after passing through the second pipe cleaning indicator 25; closing an upstream trunk ball valve and a bypass pipeline thereof, closing a downstream ball valve bypass pipeline, diffusing and replacing an isolation section medium by means of a gas diffusing and replacing pipeline, a liquid diffusing pipeline and a second-stage thick-wall pipe joint bypass pipeline, disassembling the second-stage thick-wall pipe joint, and finishing ball collection.
Step six: when all the main line pipe cleaning devices need to be intelligently cleaned at one time, the first-stage thick-wall pipe joints and the second-stage thick-wall pipe joints of all the main line pipe cleaning devices stay/sending systems are replaced by pipe joints with the same specifications as the main line pipe cleaning devices, and a channel for the all the main line pipe cleaning devices to pass through is provided.
Claims (8)
1. The utility model provides a collection and transportation pipeline segmentation pigging system which characterized in that: comprising at least one intermediate pig system arranged along the collection and transportation trunk; the intermediate pig system includes a main line pig stay/send system, a large bypass system, a pig indication system, and a logic control system, wherein:
the main line pipe cleaner staying/transmitting system comprises an upstream reducing barrier tee joint, an upstream main line ball valve, an upstream main line pressure transmitter, a first-stage thick-wall pipe joint, a second-stage thick-wall pipe joint, a third-stage ball-serving pipe joint, a downstream main line pressure transmitter, a downstream main line ball valve and a downstream reducing barrier tee joint which are sequentially connected to a collecting and transmitting main line, an air-entraining/ball-serving control bypass arranged at two ends of the upstream main line ball valve and an air-entraining/ball-collecting control bypass arranged at two ends of the downstream main line ball valve; wherein: the first-stage thick-wall pipe joint is horizontally installed, two ends of the first-stage thick-wall pipe joint are connected with flanges and are detachable, one end of the first-stage thick-wall pipe joint is connected with an upstream trunk line, one end of the first-stage thick-wall pipe joint is connected with the second-stage thick-wall pipe joint, the outer diameter of the second-stage thick-wall pipe joint is consistent with the upstream trunk line and the downstream trunk line, the inner diameter of the second-stage thick-wall pipe joint is smaller than the trunk line, the groove angle of the inner side pipe wall is 15 degrees, the inner side pipe wall is gradually thickened from the upstream to the downstream, the impact force of a buffer pipe cleaner is achieved, and the length of the pipe joint is more than or equal to 10m; the second-stage thick-wall pipe joint is horizontally installed, two ends are in flange connection and detachable, one end of the second-stage thick-wall pipe joint is connected with the first-stage thick-wall pipe joint, one end of the second-stage thick-wall pipe joint is connected with the third-stage ball-serving pipe joint, the outer diameter of the second-stage thick-wall pipe joint is consistent with that of an upstream trunk line and a downstream trunk line, the inner diameter of the second-stage thick-wall pipe joint is in a double-bell mouth type with large ends and small middle parts, and the length of the second-stage thick-wall pipe joint meets 2.5 times of the size requirement of the pipe cleaner;
the large bypass system comprises a bypass upstream ball valve connected to the upstream reducing stop strip tee joint, a bypass upstream pressure transmitter, a bypass regulating valve, a bypass downstream pressure transmitter and a bypass downstream ball valve connected to the downstream reducing stop strip tee joint;
the pig indicator system includes pig pass indicators mounted on the upstream trunk, downstream trunk, and trunk pig stop/send systems, respectively;
the logic control system comprises a pressure transmitter, a pipe cleaner through indicator signal collecting and processing system and a ball valve/regulating valve linkage control system.
2. A gathering and transportation pipeline segment pig system as recited in claim 1, wherein: the main pipeline cleaner staying/sending system comprises a balance/sweeping bypass arranged at two ends of the second-stage thick-wall pipe joint, a gas diffusing displacement pipeline and a liquid diffusing pipeline which are arranged on the pipeline.
3. A gathering and transportation pipeline segment pig system as recited in claim 2, wherein: the bleed air/service control bypass and the bleed air/service control bypass are small-caliber ball valve, regulating valve and ball valve bypass, the regulating valve is electrically controlled, and the bypass is horizontally arranged in parallel with the trunk line; the balance/purge bypass is a small-caliber ball valve, a regulating valve and a ball valve pipeline, the regulating valve is manually controlled, the bypass is opened below the trunk line, and the low point spans.
4. A gathering and transportation pipeline segment pig system as recited in claim 1, wherein: the large bypass system includes a bleed displacement line and a bypass adjustment/balancing line that spans the bypass downstream ball valve.
5. A collection and delivery pipeline segment pig system according to claim 4, wherein: the bypass adjusting/balancing pipeline is a small-caliber ball valve, an adjusting valve and a ball valve pipeline, the adjusting valve is manually controlled, and the bypass is horizontally arranged in parallel with the trunk line.
6. A gathering and transportation pipeline segment pig system as recited in claim 1, wherein: and two ends of the third-stage ball-serving pipe joint are in flange connection and detachable, one end of the third-stage ball-serving pipe joint is connected with the second-stage thick-wall pipe joint, one end of the third-stage ball-serving pipe joint is connected with the downstream trunk line, and the outer diameter of the third-stage ball-serving pipe joint is consistent with the outer diameters of the upstream trunk line and the downstream trunk line.
7. A method of cleaning a pipeline using the gathering and transportation pipeline segment cleaning system of claim 1, wherein: the method comprises the following steps:
(1) When the pipeline normally operates, all main pipeline cleaner staying/transmitting systems of the whole pipeline are started, the second-stage thick-wall pipe joint adopts a conventional pipe joint, the large bypass system is closed, and a medium is accessed into a downstream pipeline from an upstream pipeline through the main pipeline cleaner staying/transmitting system;
(2) When pigging, the last section of pipeline of the trunk line is pigged firstly: introducing the corresponding intermediate pipe cleaning system flow into a large bypass system, closing all trunk ball valves of a trunk pipe cleaner stay/delivery system, diffusing and replacing pipelines among valves, after disassembling a conventional pipe joint, placing the pipe cleaner into the second half part of a second-stage thick-wall pipe joint, installing the pipe cleaner on a trunk, after a tightness test, sequentially opening an upstream trunk ball valve bypass and a second-stage thick-wall pipe joint bypass, establishing upstream and downstream balance pressure of the ball valves, opening a downstream trunk ball valve, reducing the opening of a bypass regulating valve, opening the upstream trunk ball valve, and realizing service; after the downstream pipe cleaning indicator sends out a signal, all valves of the large bypass system are closed, and all bypass valves of the trunk line are closed;
(3) Continuing to perform pipeline cleaning on the last second section of pipeline of the trunk line according to the same installation and sending mode of the pipeline cleaner as the step (2): before the pipe cleaner enters the middle pipe cleaning system, after passing through the first pipe cleaning indicator, the downstream main line ball valve is closed, the bypass of the downstream main line ball valve is opened, the opening degree of the bypass regulating valve of the large bypass system is reduced, all ball valves of the large bypass system are opened, and after passing through the upstream reducing barrier tee joint, the upstream main line ball valve, the main line pressure transmitter and the second pipe cleaning indicator in sequence, the pipe cleaner enters the first half part of the second-stage thick-wall pipe joint; closing an upstream trunk ball valve and an upstream trunk ball valve bypass system, closing a downstream trunk ball valve bypass system, diffusing and replacing a medium of an isolation section by means of a gas diffusing and replacing pipeline, a liquid diffusing pipeline and a second-stage thick-wall pipe joint bypass pipeline, then disassembling the second-stage thick-wall pipe joint, and finishing ball collection.
8. The method of cleaning a pipeline in a collection and delivery pipeline section cleaning system of claim 7, wherein: when the whole line needs to be pigged at one time, the first-stage thick-wall pipe sections and the second-stage thick-wall pipe sections of all the main line pig stay/send systems are replaced by pipe sections equivalent to the main line specification.
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| CN109724834A (en) * | 2019-02-18 | 2019-05-07 | 西安长庆科技工程有限责任公司 | One kind being used for nonmetal pipeline oil transportation test sampling device and method |
| CN109731867A (en) * | 2019-03-16 | 2019-05-10 | 西南石油大学 | A kind of pipe cleaner deceleration receipts ball method of electromagnetic braking |
| CN110196958B (en) * | 2019-04-16 | 2022-11-01 | 中国石油天然气股份有限公司 | Method for judging encrypted pigging of wet gas gathering and transportation pipeline |
| CN112161146B (en) * | 2020-08-27 | 2022-04-12 | 中国石油工程建设有限公司 | Shared pigging connecting device and shared pipeline |
| CN115193829B (en) * | 2022-02-22 | 2023-07-25 | 舜元建设(集团)有限公司 | Air conditioner pipeline circulation flushing system |
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| GB0029285D0 (en) * | 2000-11-30 | 2001-01-17 | Alpha Thames Ltd | Pigging method and apparatus |
| GB2372789B (en) * | 2001-02-28 | 2004-04-21 | Petroleo Brasileiro Sa | Method and device to allow a rigid pig to pass into a flow pipe which requires the use of a hollow flow-constricting device |
| CA2720441C (en) * | 2009-11-04 | 2020-08-04 | Charles M. Devine | Drain system for a pigging device |
| CN103316534A (en) * | 2012-03-22 | 2013-09-25 | 上海金湖挤出设备有限公司 | Online filtering and cleaning system |
| CN203443475U (en) * | 2013-08-02 | 2014-02-19 | 李文友 | Rubber ball cleaning system |
| CN203571435U (en) * | 2013-11-11 | 2014-04-30 | 中国人民解放军总后勤部建筑工程研究所 | Middle relay boost pumping station |
| CN205640239U (en) * | 2016-04-28 | 2016-10-12 | 中国石油天然气股份有限公司 | Oil well single tube through ball oil collecting system |
| CN106523854B (en) * | 2017-01-06 | 2018-08-14 | 中国石油工程建设有限公司 | A kind of pre- membranous system of remote heavy caliber collecting pipe corrosion inhibiter list ball and method |
| CN207112368U (en) * | 2017-04-10 | 2018-03-16 | 中化天津港石化仓储有限公司 | Suitable for the simple pipe cleaning device of oil depot |
| CN208787116U (en) * | 2018-08-29 | 2019-04-26 | 中国石油工程建设有限公司 | A kind of gathering line segmentation pigging system |
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