CN111442188A - Test device and method for stopping and restarting natural gas gathering and transportation pipeline in mountainous region - Google Patents
Test device and method for stopping and restarting natural gas gathering and transportation pipeline in mountainous region Download PDFInfo
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- CN111442188A CN111442188A CN202010413450.9A CN202010413450A CN111442188A CN 111442188 A CN111442188 A CN 111442188A CN 202010413450 A CN202010413450 A CN 202010413450A CN 111442188 A CN111442188 A CN 111442188A
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- 238000012360 testing method Methods 0.000 title claims abstract description 177
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 128
- 238000000034 method Methods 0.000 title claims abstract description 103
- 239000003345 natural gas Substances 0.000 title claims abstract description 64
- 239000003112 inhibitor Substances 0.000 claims abstract description 121
- 239000007789 gas Substances 0.000 claims abstract description 114
- 239000007788 liquid Substances 0.000 claims abstract description 112
- 239000002253 acid Substances 0.000 claims abstract description 42
- 150000004677 hydrates Chemical class 0.000 claims abstract description 6
- 238000005260 corrosion Methods 0.000 claims description 30
- 230000007797 corrosion Effects 0.000 claims description 30
- 238000010998 test method Methods 0.000 claims description 28
- 238000002347 injection Methods 0.000 claims description 27
- 239000007924 injection Substances 0.000 claims description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 19
- 238000004088 simulation Methods 0.000 claims description 18
- 230000005540 biological transmission Effects 0.000 claims description 13
- 239000002912 waste gas Substances 0.000 claims description 10
- 230000015572 biosynthetic process Effects 0.000 claims description 8
- 239000012530 fluid Substances 0.000 claims description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- 238000001802 infusion Methods 0.000 claims description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 238000007664 blowing Methods 0.000 claims description 3
- 230000007613 environmental effect Effects 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 239000010865 sewage Substances 0.000 claims description 3
- 239000005341 toughened glass Substances 0.000 claims description 3
- 241000521257 Hydrops Species 0.000 claims 1
- 206010030113 Oedema Diseases 0.000 claims 1
- 238000002474 experimental method Methods 0.000 claims 1
- 238000013461 design Methods 0.000 abstract description 6
- 238000011160 research Methods 0.000 abstract description 4
- 238000011143 downstream manufacturing Methods 0.000 abstract description 3
- 239000003209 petroleum derivative Substances 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 9
- 238000013480 data collection Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000032258 transport Effects 0.000 description 1
- 230000005514 two-phase flow Effects 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/005—Pipe-line systems for a two-phase gas-liquid flow
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
- F17D5/005—Protection or supervision of installations of gas pipelines, e.g. alarm
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Pipeline Systems (AREA)
Abstract
The invention relates to a test device and a method for stopping and restarting a mountain natural gas gathering and transportation pipeline, which belong to the technical field of petroleum and natural gas engineering, and can be used for experimental research by designing the test device and the method for stopping and restarting the transportation: the method comprises the steps of stopping and restarting the mountain natural gas gathering and transporting pipeline when acid gas is contained or not contained, and the safe stopping and transporting time of the pipeline, the pressure in the pipeline in the restarting process, the liquid discharge amount in the restarting process and the restarting time; stopping and restarting the process of the mountain natural gas gathering and transportation pipeline when the inhibitor is added, and changing the relevant parameters; and (3) stopping and restarting the process of the mountain natural gas gathering and transportation pipeline when the hydrate control module is installed, and changing conditions of relevant parameters. A hydrate control module is designed, and hydrates formed in the process of stopping transportation and restarting are reduced by being installed at a low-lying position of a pipeline. Through the experimental study on the process of stopping and restarting the natural gas gathering and transportation pipeline in the mountainous region, guidance can be provided for the safe operation of the actual pipeline and the design and operation of downstream process facilities.
Description
Technical Field
The invention relates to a test device and a test method for stopping and restarting a mountain natural gas gathering and transportation pipeline, and belongs to the technical field of petroleum and natural gas engineering.
Background
The mountain natural gas gathering and transporting pipeline mainly transports natural gas, usually adopts gas-liquid mixed transportation, presents a relatively obvious gas-liquid two-phase flow state in the transportation process, has a plurality of variable fluid flow patterns and instability, and has large fluctuation and more complicated and variable fluid flow in the pipeline because the mountain natural gas gathering and transporting pipeline is mostly positioned in a mountain area. The stopping and restarting is one of the working conditions which are the key concerns of the process design of the mountain natural gas gathering and transportation pipeline, and when the pipeline is stopped due to an accident, the pressure, temperature change conditions, hydrate formation time, restarting pressure/time and liquid discharge amount in the restarting process in the pipeline after stopping transportation need to be considered.
At present, the published literature does not see the results of research on the process of stopping transportation and restarting the mountain natural gas gathering and transportation pipeline, so that the invention designs a test device and a test method for stopping transportation and restarting the mountain natural gas gathering and transportation pipeline, and comprehensively analyzes the factors influencing the pipe pressure in the process of restarting, the liquid discharge amount in the process of restarting and the restarting time in the process of stopping transportation and restarting the mountain natural gas gathering and transportation pipeline from the perspective of ensuring the safety, so as to improve the applicability and achieve the purpose of ensuring the safety of a gathering and transportation system. Meanwhile, guidance is provided for safe operation of the actual pipeline and design and operation of downstream process facilities.
Disclosure of Invention
The invention aims to provide a test device and a test method for stopping and restarting a mountain natural gas gathering and transportation pipeline, so as to better complete the test research of the process of stopping and restarting the mountain natural gas gathering and transportation pipeline.
The invention mainly solves the following problems: (1) the method comprises the steps of stopping and restarting the mountain natural gas gathering and transporting pipeline when acid gas is contained or not contained, and the safe stopping and transporting time of the pipeline, the pressure in the pipeline in the restarting process, the liquid discharge amount in the restarting process and the restarting time; (2) stopping and restarting the process of the mountain natural gas gathering and transportation pipeline when the inhibitor is added, and changing the relevant parameters; (3) when a hydrate control module is installed, the process of stopping and restarting the mountain natural gas gathering and transportation pipeline and the change condition of related parameters are realized; (4) a hydrate control module is designed, and hydrates formed in the process of stopping transportation and restarting are reduced by being installed at a low-lying position of a pipeline.
In order to achieve the above object, the present invention has the following technical means.
A test device and a method for stopping and restarting a mountain natural gas gathering and transportation pipeline comprise a test loop module 1, a gas-liquid ratio configuration module 2, an environmental temperature simulation module 3, an inhibitor filling module 4, an acid gas filling module 5, a hydrate control module 6, a data acquisition module 7, a loop 8, an exhaust gas treatment module 9, a pressure sensor 10, a temperature sensor 11, a pressurization system 12 and a slug flow catcher 13; the gas-liquid ratio configuration module 2, the inhibitor filling module 4, the acid gas filling module 5 and the pressurization system 12 are connected with the loop 8 and respectively used for controlling the liquid content, the inhibitor content, the acid gas content and the pressure of gas entering the test loop module 1, the environment temperature simulation module 3 is installed outside the test loop module 1 and provides different environment temperatures for fluid in the test loop module 1, the pressure sensor 10 and the temperature sensor 11 are symmetrically installed on the loop 8 and used for measuring the pressure and the temperature of key parts of the loop 8, measurement data are collected and recorded through the data collection module 7, and the waste gas treatment module 9 is installed at the tail of the loop 8 and used for treating tested gas.
Further, the test loop module 1 comprises a test pipe section 101, a downward-bent elbow 102, an upward-bent elbow 103, an observation pipe section 104, a gantry 105, a pulley 106, a fixing ring 107, a rope 108 and a bracket 109, wherein the test pipe section 101, the downward-bent elbow 102 and the upward-bent elbow 103 are wrapped by the environment temperature simulation module 3; the bracket 109 supports the test tube segment 101, the rope 108 passes through the pulley 106 and is fixed on the bracket 109, the pulley 106 is arranged on the fixing ring 107, and the fixing ring 107 is fixed on the gantry 105; the test pipe segment 101 comprises: the pipeline monitoring system comprises a low-lying pipeline section, a sudden shrinkage/sudden expansion pipeline section and different diameter/uphill angle/downhill angle pipeline sections, wherein the observation pipeline section 104 is made of toughened glass, the generation and distribution states of flow patterns and hydrates in the pipeline are observed through a high-speed camera, and the test loop module 1 is used for testing the states of pipeline transportation media at the low-lying pipeline section, the sudden shrinkage/sudden expansion pipeline section and the different diameter/uphill angle/downhill angle pipeline sections of the pipeline in the process of stopping transportation and restarting and determining the safe transportation stopping time by combining the pressure condition in the pipeline.
Further, the gas-liquid ratio configuration module 2 includes a gas source 201, a water source 202, a gas flow meter 203, a liquid flow meter 204, a compressor 205, a pump 206 and a mixer 207, the gas source 201 and the compressor 205 are connected, the water source 202 and the pump 206 are connected, outlets of the compressor 205 and the pump 206 are respectively connected with the mixer 207, and the gas flow meter 203 and the liquid flow meter 204 respectively meter volumes of gas and water entering the mixer 207.
Further, the inhibitor filling module 4 includes: the corrosion inhibitor filling device comprises an inhibitor filling tank 401, an inhibitor filling valve 405, a corrosion inhibitor tank 410, a mixing tank 413 and a mixing filling valve 414, wherein the inhibitor filling tank 401 and the corrosion inhibitor tank 410 are respectively connected with the mixing tank 413, and the working condition that corrosion inhibitors and inhibitors simultaneously exist in gas in a pipe is simulated; 3 inhibitor filling tanks 401 are provided, different types of inhibitors are stored, and safe infusion stopping time is simulated when different types of inhibitors are added; an emptying valve 402, a pressure gauge 403 and a liquid level meter 404 are installed on the inhibitor filling tank 401, the inhibitor is filled into the inhibitor filling tank 401 through the inhibitor tanker 407, dirt in the inhibitor filling tank 401 is discharged through a sewage discharge pipeline 406, the inhibitor in the inhibitor filling tank 401 enters the mixing tank 413 through the filling pump valve 408 and the filling pump 409, the corrosion inhibitor enters the three mixing tanks through the corrosion inhibitor tank 410 and the corrosion inhibitor pump 411, and the tanker adds the corrosion inhibitor into the corrosion inhibitor tank 410 through the corrosion inhibitor adding valve 412.
Further, the hydrate control module 6 is installed on the test loop module 1 to prevent hydrate from forming, and the hydrate control module 6 includes: the system comprises an exhaust valve 601, a liquid level controller 602, an air supply valve 603, an air source pipeline 604, a pump control system 605, a fluid conduit 606, a liquid level control container 607, a submersible pump 608, a baffle 609, a communicating pipe 610 and a conveying device 611, wherein under the normal production working condition, the liquid level control container 607 is filled with gas, part of stagnant liquid enters the liquid level control container 607 after the transportation is stopped, the pressure of the pipeline system is lower than the hydrate forming pressure, when the system is restarted, the liquid in the liquid level control container 607 is discharged through the submersible pump 608, and high-temperature liquid flowing in the pipeline enters the liquid level control container 607 to form a liquid circulation loop, so that the temperature of the pipeline is increased, and the formation of.
Further, the test method for stopping and restarting the mountain natural gas gathering and transportation pipeline comprises the following steps: a test method for stopping and restarting the transmission of the mountain natural gas gathering and transportation pipeline when no acid gas is contained, a test method for stopping and restarting the transmission of the mountain natural gas gathering and transportation pipeline when an inhibitor is added, and a test method for stopping and restarting the transmission of the mountain natural gas gathering and transportation pipeline when a hydrate control module is installed;
the test method for stopping and restarting the mountain natural gas gathering and transportation pipeline without the acid gas comprises the following specific steps:
s1, emptying, zero setting of the instrument: before the test is started, nitrogen is blown into the loop 8 to run for about half an hour, air in the loop is exhausted, a multifunctional detector is used for detecting an air outlet of a wide-range pressure gauge, blowing is stopped when the oxygen content is lower than 2%, and a pressure sensor 10 and a temperature sensor 11 on the loop 8 are zeroed;
s2, temperature regulation: starting the environment temperature simulation module 3 to enable the environment temperature simulation module 3 to reach the temperature required by the test;
s3, introducing test gas: the gas-liquid ratio configuration module 2 adjusts the liquid content of the test gas, the test gas flows out from the gas source 201, is metered by the gas flowmeter 203 and then enters the mixer 207 through the compressor 205; the water flows out from the water source 202, is metered by the liquid flowmeter 204 and then enters the mixer 207 through the pump 206, so that the liquid content of the test gas meets the test requirement;
s4, adjusting pressure: the fully mixed test gas and water are pressurized by the pressurization system 12 and then are pumped into the ring channel 8, so that the pressure of the test gas in the pipe reaches the test requirement;
s5, waste gas treatment: after flowing through the test loop module 1, the test gas in the pipe enters the waste gas treatment module 9;
s6, pipeline stopping: the loop normally runs for a period of time, after the test gas is in a stable state in the tube, the gas-liquid ratio configuration module 2 is closed, and the test gas is stopped from being input into the loop 8;
s7, observing and determining the safe outage time: aligning a high-speed camera to the observation pipe section 104, analyzing the flow pattern change condition of a medium in the pipe along with the increase of the stop time, and taking the time period from the start of stop to the occurrence of the hydrate in the pipe as the safe stop time;
s8, restarting: when the hydrate appears in the tube, the test gas is input into the loop 8 again, the pressure and the temperature at each position of the loop 8 are collected through the data acquisition module 7, and the pressure in the tube in the restarting process is measured; the accumulated liquid in the pipe discharged along with the gas enters the slug flow catcher 13, and the liquid discharge amount in the restarting process is measured; calculating the restart time according to the time when the pressure in the pipe is recovered to the pressure before stopping transportation;
s9, performing a plurality of sets of tests, adjusting the environment temperature simulation module 3, changing the environment temperature, repeating the steps S3-S8, analyzing the test results, and testing the safe stop and delivery time of the pipeline, the pressure in the pipeline during the restarting process, the liquid discharge amount during the restarting process and the restarting time under different environment temperature working conditions;
s10, performing a plurality of sets of tests, adjusting the pressurization system 12, changing the pressure of the test gas in the loop 8, repeating the steps S3-S8, analyzing the test results, and testing the safe pipeline stopping time, the pipeline internal pressure in the restarting process, the liquid discharge amount in the restarting process and the restarting time under different pipeline internal pressure working conditions;
the test method for stopping and restarting the mountain natural gas gathering and transportation pipeline when acid gas is contained comprises the following specific steps:
p1, repeating the steps S1-S4;
p2, introducing acid gas: CO is injected by the acid gas injection module 52Injecting into a pipe;
p3, repeating the steps S5-S8;
p4, performing multiple tests to regulate the acid gasA body filling module 5 for changing CO in the inlet pipe2Partial pressure of (2), analysis of test results, testing of different CO2Under the partial pressure working condition, the safe stopping and conveying time of the pipeline, the pressure in the pipeline in the restarting process, the liquid discharge amount in the restarting process and the restarting time;
p5, repeat step P1, inject H through the acid gas injection module 52S, in the injection pipe, a plurality of groups of tests are carried out, the acid gas injection module 5 is adjusted, and the H entering the pipe is changed2Partial pressure of S, analyzing test result, testing different H2S, under the partial pressure working condition, the safe stopping and conveying time of the pipeline, the pressure in the pipeline in the restarting process, the liquid discharge amount in the restarting process and the restarting time are set;
p6, repeating step P1, CO is injected by the acid gas injection module 52、H2S, in the injection pipe, a plurality of groups of tests are carried out, the acid gas injection module 5 is adjusted, and CO entering the pipe is changed2、H2Partial pressure of S, analyzing test result, testing CO-existence2、H2S and CO2、H2S, under the working conditions of different partial pressures, the safe stopping and conveying time of the pipeline, the pressure in the pipeline in the restarting process, the liquid discharge amount in the restarting process and the restarting time are set;
the test method for stopping and restarting the mountain natural gas gathering and transportation pipeline during inhibitor filling comprises the following specific steps:
m1, repeating the steps S1-S4;
m2, injection inhibitor: adding inhibitor into the pipe through the inhibitor adding module 4;
m3, repeating the steps S5-S8;
m4, performing multiple groups of tests, adjusting the inhibitor filling module 4, changing the amount of the inhibitor entering the pipe, analyzing test results, and testing the safe infusion stop time of the pipeline, the pressure in the pipe in the restarting process, the liquid discharge amount in the restarting process and the restarting time under the working conditions of different inhibitor filling amounts;
m5, repeating the step M1, adding different types of inhibitors into the pipe through the inhibitor adding module 4, analyzing test results, and testing the safe stopping and conveying time of the pipe, the pressure in the pipe in the restarting process, the liquid discharge amount in the restarting process and the restarting time under the working conditions of different types of inhibitors;
the test method for stopping and restarting the mountain natural gas gathering and transportation pipeline during installation of the hydrate control module comprises the following specific steps:
h1, repeating the steps S1-S4;
h2, starting the hydrate control module 6;
h3, repeating the steps S5-S8;
h4, determining the safe stopping and conveying time of the pipeline, the pressure in the pipeline in the restarting process, the liquid discharge amount in the restarting process and the restarting time when the hydrate control module 6 is installed on the test loop module 1.
The invention has the beneficial effects that:
(1) the invention mainly aims at the mountain natural gas gathering and transportation pipeline, and can be used for experimental research by designing a test device and a test method for stopping transportation and restarting the mountain natural gas gathering and transportation pipeline, wherein the test device comprises the following steps: the method comprises the steps of stopping and restarting the mountain natural gas gathering and transporting pipeline when acid gas is contained or not contained, and the safe stopping and transporting time of the pipeline, the pressure in the pipeline in the restarting process, the liquid discharge amount in the restarting process and the restarting time; stopping and restarting the process of the mountain natural gas gathering and transportation pipeline when the inhibitor is added, and changing the relevant parameters; and (3) stopping and restarting the process of the mountain natural gas gathering and transportation pipeline when the hydrate control module is installed, and changing conditions of relevant parameters.
(2) The invention designs a hydrate control module which is arranged at a low-lying position of a pipeline, so that hydrates formed in the processes of stopping transportation and restarting are reduced.
(3) Through the experimental study on the process of stopping and restarting the natural gas gathering and transportation pipeline in the mountainous region, guidance can be provided for the safe operation of the actual pipeline and the design and operation of downstream process facilities.
Drawings
Fig. 1 is a schematic diagram of a test device for stopping and restarting a mountain natural gas gathering pipeline in an embodiment of the invention.
FIG. 2 is a schematic diagram of a gas-liquid ratio configuration module in an embodiment of the invention.
Fig. 3 is a schematic diagram of an inhibitor filling module in an embodiment of the invention.
FIG. 4 is a schematic diagram of a hydrate control module in an embodiment of the invention.
FIG. 5 is a schematic diagram of a test loop module in an embodiment of the present invention.
FIG. 6 is a schematic diagram of a test loop with different uphill angles in an embodiment of the invention.
FIG. 7 is a schematic diagram of different downhill angle test loops in an embodiment of the present invention.
FIG. 8 is a schematic diagram of test loops of different pipe diameters in an embodiment of the present invention.
FIG. 9 is a schematic diagram of a snap/snap test loop in an embodiment of the present invention.
The following description of specific embodiments of the present invention is provided in order to better understand the present invention with reference to the accompanying drawings.
Examples
As shown in fig. 1, a test device for stopping and restarting a mountain natural gas gathering pipeline comprises a test loop module 1, a gas-liquid ratio configuration module 2, an ambient temperature simulation module 3, an inhibitor filling module 4, an acid gas filling module 5, a hydrate control module 6, a data acquisition module 7, a loop 8, an exhaust gas treatment module 9, a pressure sensor 10, a temperature sensor 11, a pressurization system 12 and a slug flow catcher 13; the gas-liquid ratio configuration module 2, the inhibitor filling module 4, the acid gas filling module 5 and the pressurization system 12 are connected with the loop 8 and respectively used for controlling the liquid content, the inhibitor content, the acid gas content and the pressure of gas entering the test loop module 1, the environment temperature simulation module 3 is installed outside the test loop module 1 and provides different environment temperatures for fluid in the test loop module 1, the pressure sensor 10 and the temperature sensor 11 are symmetrically installed on the loop 8 and used for measuring the pressure and the temperature of key parts of the loop 8, measurement data are collected and recorded through the data collection module 7, and the waste gas treatment module 9 is installed at the tail of the loop 8 and used for treating tested gas.
As shown in fig. 2, the gas-liquid ratio configuration module 2 includes a gas source 201, a water source 202, a gas flow meter 203, a liquid flow meter 204, a compressor 205, a pump 206 and a mixer 207, the gas source 201 and the compressor 205 are connected, the water source 202 and the pump 206 are connected, outlets of the compressor 205 and the pump 206 are respectively connected with the mixer 207, and the gas flow meter 203 and the liquid flow meter 204 respectively meter volumes of gas and water entering the mixer 207.
As shown in fig. 3, the inhibitor filling module 4 includes: the corrosion inhibitor filling device comprises an inhibitor filling tank 401, an inhibitor filling valve 405, a corrosion inhibitor tank 410, a mixing tank 413 and a mixing filling valve 414, wherein the inhibitor filling tank 401 and the corrosion inhibitor tank 410 are respectively connected with the mixing tank 413, and the working condition that corrosion inhibitors and inhibitors simultaneously exist in gas in a pipe is simulated; 3 inhibitor filling tanks 401 are provided, different types of inhibitors are stored, and safe infusion stopping time is simulated when different types of inhibitors are added; an emptying valve 402, a pressure gauge 403 and a liquid level meter 404 are installed on the inhibitor filling tank 401, the inhibitor is filled into the inhibitor filling tank 401 through the inhibitor tanker 407, dirt in the inhibitor filling tank 401 is discharged through a sewage discharge pipeline 406, the inhibitor in the inhibitor filling tank 401 enters the mixing tank 413 through the filling pump valve 408 and the filling pump 409, the corrosion inhibitor enters the three mixing tanks through the corrosion inhibitor tank 410 and the corrosion inhibitor pump 411, and the tanker adds the corrosion inhibitor into the corrosion inhibitor tank 410 through the corrosion inhibitor adding valve 412.
As shown in fig. 4, the hydrate control module 6 is mounted on the test loop module 1 to prevent hydrate formation, and the hydrate control module 6 includes: the system comprises an exhaust valve 601, a liquid level controller 602, an air supply valve 603, an air source pipeline 604, a pump control system 605, a fluid conduit 606, a liquid level control container 607, a submersible pump 608, a baffle 609, a communicating pipe 610 and a conveying device 611, wherein under the normal production working condition, the liquid level control container 607 is filled with gas, part of stagnant liquid enters the liquid level control container 607 after the transportation is stopped, the pressure of the pipeline system is lower than the hydrate forming pressure, when the system is restarted, the liquid in the liquid level control container 607 is discharged through the submersible pump 608, and high-temperature liquid flowing in the pipeline enters the liquid level control container 607 to form a liquid circulation loop, so that the temperature of the pipeline is increased, and the formation of.
As shown in fig. 5, the test loop module 1 includes a test pipe segment 101, a downward bend 102, an upward bend 103, an observation pipe segment 104, a gantry 105, a pulley 106, a fixing ring 107, a rope 108, and a bracket 109, wherein the test pipe segment 101, the downward bend 102, and the upward bend 103 are wrapped by the environmental temperature simulation module 3; the bracket 109 supports the test tube segment 101, the rope 108 passes through the pulley 106 and is fixed on the bracket 109, the pulley 106 is arranged on the fixing ring 107, and the fixing ring 107 is fixed on the gantry 105; the test pipe segment 101 comprises: the pipeline monitoring system comprises a low-lying pipeline section, a sudden shrinkage/sudden expansion pipeline section and different diameter/uphill angle/downhill angle pipeline sections, wherein the observation pipeline section 104 is made of toughened glass, the generation and distribution states of flow patterns and hydrates in the pipeline are observed through a high-speed camera, and the test loop module 1 is used for testing the states of pipeline transportation media at the low-lying pipeline section, the sudden shrinkage/sudden expansion pipeline section and the different diameter/uphill angle/downhill angle pipeline sections of the pipeline in the process of stopping transportation and restarting and determining the safe transportation stopping time by combining the pressure condition in the pipeline.
As shown in fig. 6 and 7, by controlling the angle of the test loop, the flow pattern change and hydrate generation conditions at the uphill slope and the downhill slope during the shutdown and restart of the mountain natural gas gathering and transporting pipeline can be studied, and the safe shutdown time of the pipeline, the pressure in the pipeline during the restart, the liquid discharge amount during the restart, and the restart time can be analyzed.
As shown in fig. 8, by controlling the pipe diameter of the test loop, the influence of different pipe diameters on the flow pattern and the hydrate generation condition in the process of stopping transportation and restarting the mountain natural gas gathering and transportation pipeline can be studied, and the safe stopping and transportation time of the pipeline, the pressure in the pipe in the process of restarting, the liquid discharge amount in the process of restarting and the restarting time can be analyzed.
As shown in fig. 9, it can be studied to analyze the flow pattern change and hydrate formation at the sudden contraction/sudden expansion position during the shutdown and restart of the mountain natural gas gathering and transportation pipeline, and to analyze the safe shutdown time of the pipeline, the pressure in the pipeline during the restart, the liquid discharge amount during the restart, and the restart time.
The test method for stopping and restarting the transmission of the mountain natural gas gathering and transmission pipeline comprises the following steps: a test method for stopping and restarting the transmission of the mountain natural gas gathering and transportation pipeline when no acid gas is contained, a test method for stopping and restarting the transmission of the mountain natural gas gathering and transportation pipeline when an inhibitor is added, and a test method for stopping and restarting the transmission of the mountain natural gas gathering and transportation pipeline when a hydrate control module is installed;
the test method for stopping and restarting the mountain natural gas gathering and transportation pipeline without the acid gas comprises the following specific steps:
s1, emptying, zero setting of the instrument: before the test is started, nitrogen is blown into the loop 8 to run for about half an hour, air in the loop is exhausted, a multifunctional detector is used for detecting an air outlet of a wide-range pressure gauge, blowing is stopped when the oxygen content is lower than 2%, and a pressure sensor 10 and a temperature sensor 11 on the loop 8 are zeroed;
s2, temperature regulation: starting the environment temperature simulation module 3 to enable the environment temperature simulation module 3 to reach the temperature required by the test;
s3, introducing test gas: the gas-liquid ratio configuration module 2 adjusts the liquid content of the test gas, the test gas flows out from the gas source 201, is metered by the gas flowmeter 203 and then enters the mixer 207 through the compressor 205; the water flows out from the water source 202, is metered by the liquid flowmeter 204 and then enters the mixer 207 through the pump 206, so that the liquid content of the test gas meets the test requirement;
s4, adjusting pressure: the fully mixed test gas and water are pressurized by the pressurization system 12 and then are pumped into the ring channel 8, so that the pressure of the test gas in the pipe reaches the test requirement;
s5, waste gas treatment: after flowing through the test loop module 1, the test gas in the pipe enters the waste gas treatment module 9;
s6, pipeline stopping: the loop normally runs for a period of time, after the test gas is in a stable state in the tube, the gas-liquid ratio configuration module 2 is closed, and the test gas is stopped from being input into the loop 8;
s7, observing and determining the safe outage time: aligning a high-speed camera to the observation pipe section 104, analyzing the flow pattern change condition of a medium in the pipe along with the increase of the stop time, and taking the time period from the start of stop to the occurrence of the hydrate in the pipe as the safe stop time;
s8, restarting: when the hydrate appears in the tube, the test gas is input into the loop 8 again, the pressure and the temperature at each position of the loop 8 are collected through the data acquisition module 7, and the pressure in the tube in the restarting process is measured; the accumulated liquid in the pipe discharged along with the gas enters the slug flow catcher 13, and the liquid discharge amount in the restarting process is measured; calculating the restart time according to the time when the pressure in the pipe is recovered to the pressure before stopping transportation;
s9, performing a plurality of sets of tests, adjusting the environment temperature simulation module 3, changing the environment temperature, repeating the steps S3-S8, analyzing the test results, and testing the safe stop and delivery time of the pipeline, the pressure in the pipeline during the restarting process, the liquid discharge amount during the restarting process and the restarting time under different environment temperature working conditions;
s10, performing a plurality of sets of tests, adjusting the pressurization system 12, changing the pressure of the test gas in the loop 8, repeating the steps S3-S8, analyzing the test results, and testing the safe pipeline stopping time, the pipeline internal pressure in the restarting process, the liquid discharge amount in the restarting process and the restarting time under different pipeline internal pressure working conditions;
the test method for stopping and restarting the mountain natural gas gathering and transportation pipeline when acid gas is contained comprises the following specific steps:
p1, repeating the steps S1-S4;
p2, introducing acid gas: CO is injected by the acid gas injection module 52Injecting into a pipe;
p3, repeating the steps S5-S8;
p4, performing multiple tests, adjusting the acid gas filling module 5, and changing the CO entering the pipe2Partial pressure of (2), analysis of test results, testing of different CO2Under the partial pressure working condition, the safe stopping and conveying time of the pipeline, the pressure in the pipeline in the restarting process, the liquid discharge amount in the restarting process and the restarting time;
p5, repeat step P1, inject H through the acid gas injection module 52S, in the injection pipe, a plurality of groups of tests are carried out, the acid gas injection module 5 is adjusted, and the H entering the pipe is changed2Partial pressure of S, analyzing test result, testing different H2S, under the partial pressure working condition, the safe stopping and conveying time of the pipeline, the pressure in the pipeline in the restarting process, the liquid discharge amount in the restarting process and the restarting time are set;
P6、repeating step P1, introducing CO through the acid gas injection module 52、H2S, in the injection pipe, a plurality of groups of tests are carried out, the acid gas injection module 5 is adjusted, and CO entering the pipe is changed2、H2Partial pressure of S, analyzing test result, testing CO-existence2、H2S and CO2、H2S, under the working conditions of different partial pressures, the safe stopping and conveying time of the pipeline, the pressure in the pipeline in the restarting process, the liquid discharge amount in the restarting process and the restarting time are set;
the test method for stopping and restarting the mountain natural gas gathering and transportation pipeline during inhibitor filling comprises the following specific steps:
m1, repeating the steps S1-S4;
m2, injection inhibitor: adding inhibitor into the pipe through the inhibitor adding module 4;
m3, repeating the steps S5-S8;
m4, performing multiple groups of tests, adjusting the inhibitor filling module 4, changing the amount of the inhibitor entering the pipe, analyzing test results, and testing the safe infusion stop time of the pipeline, the pressure in the pipe in the restarting process, the liquid discharge amount in the restarting process and the restarting time under the working conditions of different inhibitor filling amounts;
m5, repeating the step M1, adding different types of inhibitors into the pipe through the inhibitor adding module 4, analyzing test results, and testing the safe stopping and conveying time of the pipe, the pressure in the pipe in the restarting process, the liquid discharge amount in the restarting process and the restarting time under the working conditions of different types of inhibitors;
the test method for stopping and restarting the mountain natural gas gathering and transportation pipeline during installation of the hydrate control module comprises the following specific steps:
h1, repeating the steps S1-S4;
h2, starting the hydrate control module 6;
h3, repeating the steps S5-S8;
h4, determining the safe stopping and conveying time of the pipeline, the pressure in the pipeline in the restarting process, the liquid discharge amount in the restarting process and the restarting time when the hydrate control module 6 is installed on the test loop module 1.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (6)
1. A test device and a method for stopping and restarting a mountain natural gas gathering pipeline are characterized in that: the device comprises a test loop module (1), a gas-liquid ratio configuration module (2), an environmental temperature simulation module (3), an inhibitor filling module (4), an acid gas filling module (5), a hydrate control module (6), a data acquisition module (7), a loop (8), a waste gas treatment module (9), a pressure sensor (10), a temperature sensor (11), a pressurization system (12) and a slug flow catcher (13); the gas-liquid ratio configuration module (2), the inhibitor filling module (4), the acid gas filling module (5) and the pressurization system (12) are connected with the loop (8) and are respectively used for controlling the liquid content, the inhibitor content, the acid gas content and the pressure of the gas entering the test loop module (1), the environment temperature simulation module (3) is arranged outside the test loop module (1) and provides different environment temperatures for the fluid in the test loop module (1), the pressure sensor (10) and the temperature sensor (11) are symmetrically arranged on the loop (8) and used for measuring the pressure and the temperature of the key part of the loop (8), through data acquisition module (7) collection record measured data, install at ring way (8) afterbody waste gas treatment module (9), slug flow catcher (13) for collect intraductal hydrops, handle the gas after the experiment.
2. The mountain natural gas gathering and transportation pipeline transportation stop and restart test device and method according to claim 1, wherein: the test loop module (1) comprises a test pipe section (101), a downward-bent elbow (102), an upward-bent elbow (103), an observation pipe section (104), a portal frame (105), a pulley (106), a fixing ring (107), a rope (108) and a bracket (109), wherein the test pipe section (101), the downward-bent elbow (102) and the upward-bent elbow (103) are wrapped by the environment temperature simulation module (3); the bracket (109) supports the test pipe section (101), the rope (108) passes through the pulley (106) and is fixed on the bracket (109), the pulley (106) is arranged on the fixing ring (107), and the fixing ring (107) is fixed on the portal frame (105); the test pipe section (101) comprises: the pipeline testing system comprises a low-lying pipeline section, a sudden shrinkage/sudden expansion pipeline section and different diameter/uphill angle/downhill angle pipeline sections, wherein the observation pipeline section (104) is made of toughened glass, the generation and distribution states of flow patterns and hydrates in the pipeline are observed through a high-speed camera, and a testing loop module (1) is used for testing the states of pipeline conveying media at the low-lying pipeline section, the sudden shrinkage/sudden expansion pipeline section and the different diameter/uphill angle/downhill angle pipeline sections of the pipeline in the processes of stopping conveying and restarting, and determining the safe conveying stopping time, measuring the pressure in the pipeline in the process of restarting and the liquid discharge amount in the process of restarting by combining the pressure condition in the pipeline; and calculating the restarting time according to the time when the pressure in the pipe is recovered to the pressure before stopping delivering.
3. The mountain natural gas gathering and transportation pipeline transportation stop and restart test device and method according to claim 1, wherein: the gas-liquid ratio configuration module (2) comprises a gas source (201), a water source (202), a gas flow meter (203), a liquid flow meter (204), a compressor (205), a pump (206) and a mixer (207), wherein the gas source (201) and the compressor (205) are connected, the water source (202) and the pump (206) are connected, outlets of the compressor (205) and the pump (206) are respectively connected with the mixer (207), the mixer (207) fully mixes gas and water, and the gas flow meter (203) and the liquid flow meter (204) respectively meter the volumes of the gas and the water entering the mixer (207).
4. The mountain natural gas gathering and transportation pipeline transportation stop and restart test device and method according to claim 1, wherein: the inhibitor filling module (4) comprises: the corrosion inhibitor injection device comprises an inhibitor injection tank (401), an inhibitor injection valve (405), a corrosion inhibitor tank (410), a mixing tank (413) and a mixing injection valve (414), wherein the inhibitor injection tank (401) and the corrosion inhibitor tank (410) are respectively connected with the mixing tank (413), and the working condition that the corrosion inhibitor and the inhibitor exist in gas in a pipe transportation at the same time is simulated; 3 inhibitor filling tanks (401) are provided, different types of inhibitors are stored, and safe infusion stopping time is simulated when different types of inhibitors are added; an emptying valve (402), a pressure gauge (403) and a liquid level meter (404) are installed on the inhibitor filling tank (401), an inhibitor is filled into the inhibitor filling tank (401) through an inhibitor tank truck (407), dirt in the inhibitor filling tank (401) is discharged through a sewage discharge pipeline (406), the inhibitor in the inhibitor filling tank (401) enters the mixing tank (413) through the filling pump valve (408) and the filling pump (409), the corrosion inhibitor enters the three mixing tanks through the corrosion inhibitor tank (410) and the corrosion inhibitor pump (411), and the tank truck adds the corrosion inhibitor into the corrosion inhibitor tank (410) through the corrosion inhibitor adding valve (412).
5. The mountain natural gas gathering and transportation pipeline transportation stop and restart test device and method according to claim 1, wherein: the hydrate control module (6) is mounted on the test loop module (1) for preventing hydrate formation, the hydrate control module (6) comprising: discharge valve (601), liquid level controller (602), air feed valve (603), air supply pipeline (604), pump control system (605), fluid pipe (606), liquid level control container (607), immersible pump (608), baffle (609), communicating pipe (610), conveyer (611), under the normal production operating mode, be full of gas in liquid level control container (607), stop defeatedly the back, partly stay liquid gets into in liquid level control container (607), makes pipeline system pressure be less than hydrate formation pressure, during the restart, through immersible pump (608) discharge liquid in liquid level control container (607), the high temperature liquid that flows in the pipeline gets into liquid level control container (607), forms liquid circulation circuit, improves the pipeline temperature, reduces hydrate formation.
6. The mountain natural gas gathering and transportation pipeline transportation stop and restart test device and method according to claim 1, wherein: the test method for stopping and restarting the transmission of the mountain natural gas gathering and transmission pipeline comprises the following steps: a test method for stopping and restarting the transmission of the mountain natural gas gathering and transportation pipeline when no acid gas is contained, a test method for stopping and restarting the transmission of the mountain natural gas gathering and transportation pipeline when an inhibitor is added, and a test method for stopping and restarting the transmission of the mountain natural gas gathering and transportation pipeline when a hydrate control module is installed;
the test method for stopping and restarting the mountain natural gas gathering and transportation pipeline without the acid gas comprises the following specific steps:
s1, emptying, zero setting of the instrument: before the test is started, nitrogen is blown into the loop (8) to run for about half an hour, air in the loop is exhausted, a multifunctional detector is used for detecting at a large-range pressure gauge vent, blowing is stopped when the oxygen content is lower than 2%, and a pressure sensor (10) and a temperature sensor (11) on the loop (8) are zeroed;
s2, temperature regulation: starting the environment temperature simulation module (3) to enable the environment temperature simulation module (3) to reach the temperature required by the test;
s3, introducing test gas: the gas-liquid ratio configuration module (2) adjusts the liquid content of the test gas, the test gas flows out of the gas source (201), is metered by the gas flowmeter (203), and then enters the mixer (207) through the compressor (205); the water flows out from the water source (202), is metered by the liquid flowmeter (204), and then enters the mixer (207) through the pump (206), so that the liquid content of the test gas meets the test requirement;
s4, adjusting pressure: the fully mixed test gas and water are pressurized by the pressurization system (12) and then are pumped into the loop (8), so that the pressure of the test gas in the pipe meets the test requirement;
s5, waste gas treatment: test gas in the pipe flows through the test loop module (1) and then enters the waste gas treatment module (9);
s6, pipeline stopping: the loop normally runs for a period of time, after the test gas is in a stable state in the tube, the gas-liquid ratio configuration module (2) is closed, and the test gas is stopped from being input into the loop (8);
s7, observing and determining the safe outage time: aligning the observation pipe section (104) with a high-speed camera, analyzing the flow pattern change condition of a medium in the pipe along with the increase of the stop delivery time, and taking the time period from the start of stop delivery to the occurrence of the hydrate in the pipe as the safe stop delivery time;
s8, restarting: when the hydrate appears in the tube, the test gas is input into the loop (8) again, the pressure and the temperature at each position of the loop (8) are collected through the data acquisition module (7), and the pressure in the tube in the restarting process is measured; the accumulated liquid in the pipe discharged along with the gas enters the slug flow catcher (13) and the liquid discharge amount in the restarting process is measured; calculating the restart time according to the time when the pressure in the pipe is recovered to the pressure before stopping transportation;
s9, carrying out a plurality of sets of tests, adjusting the environment temperature simulation module (3), changing the environment temperature, repeating the steps S3-S8, analyzing the test results, and testing the safe stop and delivery time of the pipeline, the pressure in the pipeline in the restarting process, the liquid discharge amount in the restarting process and the restarting time under different environment temperature working conditions;
s10, performing a plurality of groups of tests, adjusting the pressurization system (12), changing the pressure of the test gas in the loop (8), repeating the steps S3-S8, analyzing the test results, and testing the safe stop and delivery time of the pipeline, the pressure in the pipeline in the restarting process, the liquid discharge amount in the restarting process and the restarting time under different pressure working conditions in the pipeline;
s11, carrying out a plurality of sets of tests, adjusting the gas-liquid ratio configuration module (2), changing the liquid content of the test gas, repeating the steps S3-S8, analyzing the test result, and testing the safe pipeline stopping time, the pressure in the pipeline in the restarting process, the liquid discharge amount in the restarting process and the restarting time under the working conditions of different liquid contents;
the test method for stopping and restarting the mountain natural gas gathering and transportation pipeline when acid gas is contained comprises the following specific steps:
p1, repeating the steps S1-S4;
p2, introducing acid gas: CO is fed through the acid gas filling module (5)2Injecting into a pipe;
p3, repeating the steps S5-S8;
p4, performing multiple tests, adjusting the acid gas filling module (5) and changing the CO entering the pipe2Partial pressure of (2), analysis of test results, testing of different CO2Under the partial pressure working condition, the safe stopping and conveying time of the pipeline, the pressure in the pipeline in the restarting process, the liquid discharge amount in the restarting process and the restarting time;
p5, repeating the step P1, H is filled by the acid gas filling module (5)2S, in the injection pipe, a plurality of groups of tests are carried out, the acid gas injection module (5) is adjusted, and H entering the pipe is changed2Partial pressure of S, analytical testTest results, test for different H2S, under the partial pressure working condition, the safe stopping and conveying time of the pipeline, the pressure in the pipeline in the restarting process, the liquid discharge amount in the restarting process and the restarting time are set;
p6, repeating the step P1, introducing CO by said acid gas injection module (5)2、H2S, in the injection pipe, a plurality of groups of tests are carried out, the acid gas injection module (5) is adjusted, and CO entering the pipe is changed2、H2Partial pressure of S, analyzing test result, testing CO-existence2、H2S and CO2、H2S, under the working conditions of different partial pressures, the safe stopping and conveying time of the pipeline, the pressure in the pipeline in the restarting process, the liquid discharge amount in the restarting process and the restarting time are set;
the test method for stopping and restarting the mountain natural gas gathering and transportation pipeline during inhibitor filling comprises the following specific steps:
m1, repeating the steps S1-S4;
m2, injection inhibitor: adding inhibitor into the tube by the inhibitor filling module (4);
m3, repeating the steps S5-S8;
m4, performing multiple groups of tests, adjusting the inhibitor filling module (4), changing the amount of the inhibitor entering the pipe, analyzing test results, and testing the safe infusion stop time of the pipeline, the pressure in the pipe in the restarting process, the liquid discharge amount in the restarting process and the restarting time under the working conditions of different inhibitor filling amounts;
m5, repeating the step M1, adding different types of inhibitors into the pipe through the inhibitor filling module (4), analyzing test results, and testing the safe stop and delivery time of the pipeline, the pressure in the pipe in the restarting process, the liquid discharge amount in the restarting process and the restarting time under the working conditions of different types of inhibitors;
the test method for stopping and restarting the mountain natural gas gathering and transportation pipeline during installation of the hydrate control module comprises the following specific steps:
h1, repeating the steps S1-S4;
h2, starting the hydrate control module (6);
h3, repeating the steps S5-S8;
h4, determining the safe stopping and conveying time of the pipeline, the pressure in the pipeline in the restarting process, the liquid discharge amount in the restarting process and the restarting time when the hydrate control module (6) is installed on the test loop module (1).
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