CN105510529B - Multiphase transportation pipeline device and hydrate generation, the analogy method for blocking and melting - Google Patents
Multiphase transportation pipeline device and hydrate generation, the analogy method for blocking and melting Download PDFInfo
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Abstract
The invention discloses a kind of multiphase transportation pipeline device and hydrate generation, the analogy method for blocking and melting, including a reactor I and reactor II, reactor I and reactor II are connected with same air supply system, reactor I is provided with grouting port, reactor II top and bottom are connected by circulation line, and liquid injection port is provided with circulation line；The temperature control equipment that its temperature is adjusted is equipped with reactor I and reactor II, and the detection means of gas hydrates reactiveness in signal piping is also equipped with circulation line, detection means is connected with data handling system, and described detection means is connected with data handling system.The loss that measure of the present invention for high-risk blocked state stops production for a long time for control piper by blocking has extraordinary effect.
Description
Technical field
The invention belongs to pipeline safety control technology field, more particularly to a kind of multiphase transportation pipeline device and hydrate life
Into, block and ablation analogy method.
Background technology
Gas hydrates be water with methane, ethane, carbon dioxide and hydrogen sulfide etc. non-ization that is formed of micro-molecular gas
Learn Targets caged crystalline solid.In oil-gas mining and transportation, due to high pressure and cryogenic conditions, it is easy to formed natural
Gas hydrate blocking pipeline, hinder normal production.Hydrate was found first in natural gas transportation pipeline from the former Soviet Union in 1934
Since ice is stifled, as petrol resources exploitation constantly develops to deep water field, all kinds of problems triggered by hydrate are increasingly becoming stone
The study hotspot of oily industrial circle flowing safety guarantee.Wherein, ground to forming hydrate Prevention Technique in transportation pipeline
Study carefully particularly important and prominent.
Found according to the investigation of preventing and controlling natural gas hydrate technical research in the transportation pipeline to domestic and foreign current, state
Inside and outside research is also far from enough in terms of hydrate the Control Technology especially research of transfer pipeline hydrate Control Technology.It is involved
Domestic and international main patent have following items.
Chinese patent CN201310712299 discloses a kind of simulation oil air pipe flow of fluid safety evaluation device, including
Multiphase flow circulating system, piece-rate system, infusion fluid systems and gas recovery system.Cryogenic high pressure environment can be simulated, be used for into
Row oil gas pipeline flow of fluid safety evaluatio, including the problems such as hydrate, wax deposit caused oil gas pipeline blockage and because
Oil-gas transportation safety problem caused by corrosion of piping.
Chinese patent CN201310561102 is related to a kind of pipeline type gas hydrate generation experimental provision, and it includes gas-liquid
Induction system, cooling system and hydrate pipeline generation system, wherein, gas-liquid induction system includes gas cylinder, air accumulator, discharge port
First, centrifugal pump, fluid flowmeter, compressor, gas flowmeter, separator and surge tank；Cooling system includes cooler bin, excretion
Mouth two, cold bath one and cold bath two；Hydrate pipeline generation system includes dosing mouth, microbubble generator, adpting flange, torsion
Belt type spiral flow-generator, temperature sensor, pressure sensor, differential manometer, observation window and experiment pipeline section.A whole set of experimental provision
Easy to operate, operating cost is relatively low, meets the requirement of the generation of hydrate slurry and flowing law experiment.
Chinese patent CN104818962A discloses a kind of release method of gas production well shaft Hydrate Plugging, is to generation
After acid working solution is pumped into the pit shaft of Hydrate Plugging, then put into by that can be material bag that the acid working solution disappears molten
The heating unit of the calcium oxide covered.Described acid working solution is at least to suppress containing hydrochloric acid, metal inhibitor and hydrate
The aqueous solution of agent.This method by calcium oxide in working solution generation calcium hydroxide and further with the play during acid reaction
Strong heat release, the part of pit shaft Hydrate Plugging is heated, blocked up so as to solve deicing.The method without needing heavy duty work equipment,
Heat caused by enabling effectively concentrates on the stifled part of ice, the thermal efficiency is substantially increased, so as to significantly shorten hydrate de-plugging
Time, institute's dosage is small, and the activity duration is short, and cost is low, easy to operate, and precipitates and produce without new solid in processing procedure,
New pit shaft stopping state will not be caused.
Chinese patent CN104848034A discloses a kind of spontaneous pyrolysis hydrate frozen block device of gas well pipeline, by spontaneous
Compound is pyrolyzed, there is the advantages of technique is simple, and energy-conserving and environment-protective are easy to loading and unloading, and labor intensity is small.
Chinese patent CN104399716A discloses a kind of method for releasing Hydrate Plugging in transportation pipeline.The party
Method comprises the following steps：By Hydrate Plugging section both ends in transportation pipeline by snap joint respectively with gas-liquid recycling can phase
Connection is depressured, and keeps the pressure balance at Hydrate Plugging section both ends；Cut off the connection between snap joint and gas-liquid
Connection between recycling can and snap joint, Hydrate Plugging section injection hydrate inhibitor and/or high temperature logistics, then oil gas is defeated
The hydrate in pipeline is sent to be decomposed.
Above patented technology, the Conduce Disciplinarian and flowing law to hydrate, the release method of hydrate is carried out
Research and design.Each patent above, exists in preventing and controlling natural gas hydrate technical research in applied to transportation pipeline
Problems with：
(1) each patent more than can be carried out to the flow behavior after the forming process and gas hydrate synthesis of hydrate in pipeline
Research, but effectively the blocking process and blocking mechanism of hydrate in pipeline can not be analyzed and researched.
(2) above patent is mainly used in studying the prevention of hydrate and generation technique in pipeline, to hydrate shape in pipeline
The decomposition technique such as the heating of hydrate, decompression, injecting then can not be studied effectively after being blocked into rear or pipeline.
(3) each patent more than can be studied the blocking block releasing technique of hydrate in pipeline, but used method
The generating process of hydrate can not be considered, the de-plugging to hydrate is carried out using single method.
(4) above patent is mainly used in studying the de-plugging process of hydrate in pipeline, does not consider hydrate tool in detail
The difference of state after body generation, used method is also unified method so that method for removing blockage effect is unsatisfactory.
In a word, above patent is not comprehensive to hydrate generation, the whole flow process research flowed, block, decomposed in pipeline,
Therefore the present invention devises a kind of experimental provision for being used to study preventing and controlling natural gas hydrate technology in transportation pipeline comprehensively
A kind of and integrated approach that can block progress de-plugging to it according to hydrate generation phase.
The content of the invention：
It is an object of the present invention to provide a kind of multiphase transportation pipeline device and hydrate generation, the simulation side for blocking and melting
Method.Oil, gas and water three are added to reaction kettle body system or circuit system, by stirring, circulating, refrigerant circulation temperature control, exhaust
The effect of decompression, note chemical reagent etc., study the actual Prevention Technique managed defeated condition and manage gas hydrates in defeated technique.
The concrete technical scheme that the present invention realizes is as follows：
A kind of multiphase transportation pipeline device and hydrate generation, the analogy method for blocking and melting, including oil and gas multiphase flow pipe
Duct device and hydrate generation, blocking and the analogy method melted based on the device.
A kind of multiphase transportation pipeline device, including a reactor I and reactor II, described reactor I and reactor
II is connected with same air supply system, and described reactor I is provided with grouting port, and reactor II top and bottom are by following
Ring pipeline connection, liquid injection port is provided with described circulation line；It is equipped with described reactor I and reactor II to its temperature
The temperature control equipment being adjusted is spent, and gas hydrates reactiveness in signal piping is also equipped with circulation line
Detection means, described detection means is connected with data handling system.
Described detection means include being arranged on temperature sensor on circulation line, pressure sensor, laser particle analyzer,
Differential pressure pick-up and flowmeter；Pressure gauge and row pressure mouth are provided with reactor II.
Described circulation line is additionally provided with detachable section, and the outer ring of described detachable section is provided with circulation jacket pipe, described
Circulation jacket pipe with to circulation line carry out temperature adjustment cooling water circulation machine be connected.
Described liquid injection system includes the liquid injection port being arranged on reactor I and the constant flow pump being connected with reactor I.
Described air supply system includes air accumulator, and described air accumulator is connected with reactor I, reactor II respectively by pipeline
It is logical, and it is equipped with the control valve for controlling it to cut-off, gas volume flow on the pipeline that is connected with reactor I, reactor II of air accumulator
Gauge and vavuum pump, gas pressure reducer is connected with the outlet of air accumulator, reactor I, reaction can be adjusted by air supply system
Kettle II pressure size.
The agitating device being stirred to its inside is additionally provided with described reactor II and reactor I.
Described temperature control equipment includes cooling water circulation machine, is enclosed with reactor II and reactor I outer surface
Chuck is circulated, the inside of the circulation chuck is connected with cooling water circulation machine.
The outer ring of the detachable section of described circulation line also is provided with circulating jacket pipe, and described circulation jacket pipe is provided with
Refrigerant circulation interface, described refrigerant circulation interface are connected with cooling water circulation machine.
Hydrate generation based on multiphase transportation pipeline device, the analogy method for blocking and melting, comprise the following steps：
Step 1, the formation to hydrate in circulation line is monitored, establish hydrate generation Posterior circle loine pressure with
The relational model of flow；
Step 2, pressure and discharge relation model after being generated according to hydrate, actual flow is calculated with being flowed before hydrate generation
The ratio of amount, thereby establishes criterion, and the generation blocking stage of hydrate is divided；
Step 3, according to the flow of actual cycle pipeline and pressure drop parameter, the stage of its Hydrate Plugging is judged；
Step 4, the stage according to residing for hydrate proposes corresponding method for removing blockage；
Step 5, complete de-plugging system is established.
Further, the method for establishing hydrate generation model described in step 1 is：By monitoring pressure and stream in pipeline
Amount judges the generation situation of hydrate, establishes after hydrate generates flow and the relation of pressure drop in pipeline, that is, establishes hydrate
The relational model of loine pressure and flow after generation.
Further, in step 2, using the ratio of flow before actual flow and hydrate generation as main basis for estimation, profit
Auxiliary judgment foundation is turned to the pressure drop that hydrate in pipeline flows and the change of discharge relation and pipeline inner pressure.
Further, in the pressure drop and discharge relation and pipeline that hydrate flows in the pipeline based on actual oil and gas multiphase flow pipeline
The change of pressure determines that hydrate generates in pipeline, and critical reality is determined with plugging removal effect experiment using thermodynamic inhibitor is noted
The ratio of flow is as judgment threshold before flow generates with hydrate.
Further, in step 3, if the ratio of actual actual flow and flow before hydrate generation is less than threshold value, and manage
The pressure drop that hydrate flows in road is defined as hydrate generation with discharge relation and pipeline inner pressure, then it is high-risk to judge that pipeline enters
Blocked state, be otherwise determined as low blocked state, if while the ratio of flow is 0 before the generation of actual flow and hydrate, sentence
Break as completely plugged state, Hydrate Plugging in pipeline is thereby divided into low blocked state, high-risk blocked state and completely stifled
Plug-like state.
Further, the method for removing blockage in step 4 is：Low blocked state uses injecting de-plugging, high-risk blocked state and completely
Blocked state is using decompression de-plugging.
Further, low blocked state uses injecting de-plugging, its solvent injected for hydrate thermodynamic inhibitor methanol or
Person's ethylene glycol, injecting concentration and flow are based on water content, flow, gas component in pipeline and calculated.
Further, high-risk blocked state is unidirectionally depressured, pressure decay rate passes through air bleeding valve control using decompression de-plugging using downstream
System, while gas-liquid flow velocity in monitored pipeline, control pressure decay rate ensures that gas-liquid flow velocity is consistent with before decompression in pipeline, until pipeline
Interior pressure drops to below hydrate generation pressure.
Further, completely plugged state is using decompression de-plugging, and using upstream and downstream two-way step down, pressure decay rate passes through air bleeding valve
Control, while temperature in monitored pipeline, temperature is not less than 0 degree Celsius in control piper.Until pipeline inner pressure drops to hydration
Below thing generation pressure.
Beneficial effects of the present invention are as follows：
1. apparatus of the present invention can be used for studying：
(1) formation of gas hydrates in-line and distribution character
Generating rate of the hydrate in pipeline, life under the conditions of different temperatures, pressure, flow velocity, moisture content, chemical addition agent
Position, growing amount are different, and present apparatus temperature, pressure, flow velocity are controllable, when moisture content is with chemical reagent difference, are by measuring
System and data acquisition and processing system experimental data is analyzed, you can under the defeated technique of different pipes gas hydrates it is pre-
Anti- technology is studied.
(2) flow behavior of gas hydrates in-line
After gas hydrates in-line is formed, when flow velocity, moisture content, chemical reagent condition difference, hydrate exists
Aggregation, deposition, stopping state in flow process is different, changes reactor I stir speed (S.S.) speed and circuit system recycle stream
Speed can researching natural gas hydrate in-line flow behavior.
(3) resolution characteristic of gas hydrates in-line
When system temperature, pressure condition change or inject chemical reagent, the hydrate in pipeline will decompose, profit
Change system temperature, pressure or addition chemical reagent with the temperature of the present apparatus, control pressurer system and liquid injection system, you can research
The resolution characteristic of gas hydrates under different pipeline de-plugging process.
(4) hydrate generates situation in the defeated operating mode underground pipelines of start and stop
By opening, closing reactor stirring or open, the stopping actual defeated operating mode of pipeline start and stop of circuit circulating analog, research
The Prevention Technique of gas hydrates in-line under the defeated technique of start and stop.
2. a kind of multiphase transportation pipeline device provided by the invention and hydrate generation, the analogy method of blocking and ablation are
It is a kind of to block the integrated approach for carrying out de-plugging to it according to Hydrate Plugging state phase, i.e., given birth to based on hydrate in pipeline
Change into the relation and pressure of the change of rear flow, pressure drop and flow establishes the criterion of Hydrate Plugging condition discrimination, by
The different conditions of Hydrate Plugging in this determination pipeline, gas hydrates blocked state is divided into low dangerous blocked state, height
Danger blocked state and completely plugged state, different method for removing blockage, i.e., low danger blocked state are used according to different blocked states
Using note thermodynamic inhibitor method de-plugging, decompression de-plugging, and two kinds are used to high-risk blocked state and completely plugged state
The method and control speed of state decompression de-plugging are different.Using based on the combination method for removing blockage of pipeline blockage state relative to list
One method for removing blockage is more comprehensive, and more safety economy.Low danger blocked state uses injecting de-plugging in time, and production will not be caused
Big influence；In high-risk blocked state in time using the decompression de-plugging of control speed, pipeline will not be caused further completely plugged,
And it is not in local completely plugged accident that can control during de-plugging；Two-way step down is used after generation is completely plugged
De-plugging, and control speed, it is ensured that secondary blocking will not be occurred because of the formation of ice by blocking in process pipeline.The present invention is for height
The loss that the measure of danger blocked state stops production for a long time for control piper by blocking has extraordinary effect.
Brief description of the drawings
Fig. 1 is a kind of multiphase transportation pipeline device of the present invention.
The step of Fig. 2 is the implementation of the present invention is schemed；
In Fig. 1：1- gas cylinders, 2- gas pressure reducers, 3- gas volume flow gauge, 4- vavuum pumps, 5- reactors II, 6-
Reactor I, 7- circulation chuck, 8- circular non-opaque visual windows, 9- cooling water circulation machines, 10- constant flow pumps, 11- magnetic centrifugal pumps,
12- magnetic stirring apparatus, 13- mechanical agitators, 14- high-pressure hoses, 15- ball valves, the band that 16- is connected by flange bypass pipeline section,
17- circuit visible segments, the detachable pipeline section that 18- is connected by flange, 19- circulation jacket pipes, 20- refrigerant circulation interfaces, 21- are anti-
Answer kettle liquid injection port, 22- circuits feed liquor/exhaust outlet, 23- reactor exhaust outlets, 24- temperature sensors, 25- pressure sensors, 26-
Differential pressure pick-up, 27- pressure gauges, 28- mass flowmenters, 29- torque sensors, 30- laser particle analyzers, 31- gas chromatographs.
Embodiment
To make the purpose of the present invention, technical scheme become apparent from understanding, the present invention is made with reference to the accompanying drawings further detailed
Describe in detail bright.
As shown in Figure 1, a kind of multiphase transportation pipeline device, including reactor system and circuit system, mainly by supplying
System, liquid injection system, the reaction system/circulatory system, temperature, control pressurer system, measuring system, data acquisition and processing system
Six parts.
Temperature, control pressurer system include cooling water circulation machine 9, circuit feed liquor/exhaust outlet 22 and reactor exhaust outlet 23.
Measuring system includes temperature sensor 24, pressure sensor 25, differential pressure pick-up 26, pressure gauge 27, gas volume
Flowmeter 3, mass flowmenter 28, torque sensor 29, laser particle analyzer 30 and gas chromatograph 31.
Data acquisition and processing system is computer system.
The specific connected mode of said apparatus is as follows：
Reactor I6 and reactor II5 are connected with same air supply system, and air supply system is distinguished by a three-way pipe
It is connected with reactor I6 and reactor II5；And reactor I6 is also connected with liquid injection system, reactor II5 top and bottom lead to
Circulation line connection is crossed, liquid injection port is provided with described circulation line；It is equipped with described reactor I6 and reactor II5
The control device that its temperature and pressure is adjusted.
The circulatory system by the reactor II 5 with mechanical agitator 13, it is some by flange connect high-pressure hose 14,
Magnetic centrifugal pump 11, some ball valves 15, some bands connected by flange bypass pipeline section 16, circuit visible segments 17, some passed through
The detachable pipeline section 18 of flange connection, which is sequentially connected in series, to be formed, and is additionally provided with temperature sensor 24, pressure sensor 25, laser grain thereon
Degree instrument 30 and differential pressure pick-up 26, described reactor II5 are provided with pressure gauge 27 and row pressure mouth.
Described liquid injection system includes the reactor liquid injection port 21 being arranged on reactor I6 and is connected with reactor I6
Constant flow pump 10.
Air supply system includes gas cylinder 1, the gas decompression that closed system is in turn connected into by stainless steel gas transmission line
Valve 2, gas volume flow gauge 3, vavuum pump 4.The gas cylinder 1 of air supply system by pipeline respectively with reactor I6, reactor
II5 is connected, and be equipped with the pipeline that is connected with reactor I6, reactor II5 of gas cylinder 1 control it to cut-off control valve,
Gas volume flow gauge 3 and vavuum pump 4, gas pressure reducer 2 is connected with the outlet of gas cylinder 1.
The agitating device being stirred to its inside is additionally provided with reactor II5 and reactor I6.Reactor I6's stirs
It is magnetic stirring apparatus 12 to mix device；Reactor II5 agitating device is mechanical agitator 13, and it arranges at three and stirred from top to bottom
Blade.
Temperature control equipment includes cooling water circulation machine 9, and circulation is enclosed with reactor II5 and reactor I6 outer surface
Chuck 7, circulate chuck 7 on be provided with connection refrigerant refrigerant circulation interface be connected with cooling water circulation machine 9.
Reactor I6 front and rear two sides is provided with the circular non-opaque visual window made of high pressure resistant quartz glass is material.
The visible segments of circulation line are provided with rectangle visual window and each one section of circular visual window.
Two sides has the circular non-opaque made of high pressure resistant quartz glass is material visual before and after reactor system reactor I6
Window 8.
The visual pipeline section 17 of circuit is provided with rectangle visual window and each one section of circular visual window.
The outer surface of detachable pipeline section 18 connected by flange is enclosed with circulation jacket pipe 19, described to circulate outside jacket pipe 19
There is refrigerant circulation interface 20 on surface, and described refrigerant circulation interface is connected with cooling water circulation machine.
As shown in Fig. 2 gas hydrates block method for removing blockage bag in a kind of oil and gas multiphase flow pipeline of the embodiment of the present invention
Include following steps：
S101, the formation to hydrate in oil and gas multiphase flow pipeline are monitored, establish hydrate generation after loine pressure with
The relational model of flow；
S102, pressure and discharge relation model after being generated according to hydrate, actual flow is calculated with being flowed before hydrate generation
The ratio of amount, thereby establishes criterion, and the generation blocking stage of hydrate is divided；
S103, according to the flow of actual pipeline and pressure drop parameter, judge the stage of its Hydrate Plugging；
S104, the stage according to residing for hydrate propose corresponding method for removing blockage；
S105, establish complete de-plugging system.
The present invention specific implementation flow be：
The method for establishing hydrate generation model described in step 1 is：By monitoring pressure and flow judgement in pipeline
The generation situation of hydrate, flow and the relation of pressure drop in pipeline are established after hydrate generation, that is, after establishing hydrate generation
The relational model of loine pressure and flow.
In step 2, using the ratio of flow before actual flow and hydrate generation as main basis for estimation, using in pipeline
The pressure drop and the change of discharge relation and pipeline inner pressure of hydrate flowing are turned to auxiliary judgment foundation.
In step 2, pressure drop and discharge relation that hydrate in the pipeline of actual oil and gas multiphase flow pipeline flows are tested, is made pair
Relation curve is answered, has unexpected reduction in hydrate formation by pressure in signal piping, determines flow in pipeline
Decline is due to that hydrate generation causes, using note the experiment of thermodynamic inhibitor and plugging removal effect determine critical actual flow with
For the ratio of flow as judgment threshold, its value is 0.1 before hydrate generation.
In step 3, if the ratio of actual actual flow and flow before hydrate generation is less than threshold value 0.1, and in pipeline
The pressure drop of hydrate flowing is defined as hydrate generation with discharge relation and pipeline inner pressure, then judges that pipeline enters high-risk blocking
State, be otherwise determined as low blocked state, if while the ratio of flow is 0 before the generation of actual flow and hydrate, be judged as
Completely plugged state, Hydrate Plugging in pipeline is thereby divided into low blocked state, high-risk blocked state and completely plugged shape
State.
Method for removing blockage in step 4 is：Low blocked state uses injecting de-plugging, high-risk blocked state and completely plugged state
Using decompression de-plugging.
In step 4, low blocked state uses injecting de-plugging, and its solvent injected is hydrate thermodynamic inhibitor (second two
Alcohol), injecting concentration and flow are based on water content, flow, gas component in pipeline and calculated, according to add the temperature after agent and
Actual motion temperature judges determination, and actual injecting concentration is mass concentration 50-70%.
In step 4, high-risk blocked state is unidirectionally depressured, pressure decay rate passes through air bleeding valve using decompression de-plugging using downstream
Control, pressure decay rate 0.01-0.05MPa/s, while gas-liquid flow velocity in monitored pipeline, control pressure decay rate ensure gas in pipeline
Flow velocity is consistent with before decompression, until pipeline inner pressure drops to below hydrate generation pressure.
In step 5, completely plugged state is using decompression de-plugging, and using upstream and downstream two-way step down, pressure decay rate passes through exhaust
Valve controls, pressure decay rate 0.03-0.1MPa/s, while temperature in monitored pipeline, maintains 1-3 degrees Celsius, temperature is not less than 0
Degree Celsius.Until pipeline inner pressure drops to below hydrate generation pressure.
Although above-mentioned the embodiment of the present invention is described with reference to accompanying drawing, model not is protected to the present invention
The limitation enclosed, one of ordinary skill in the art should be understood that on the basis of technical scheme those skilled in the art are not
Need to pay various modifications or deformation that creative work can make still within protection scope of the present invention.
Although above-mentioned the embodiment of the present invention is described with reference to accompanying drawing, model not is protected to the present invention
The limitation enclosed, one of ordinary skill in the art should be understood that on the basis of technical scheme those skilled in the art are not
Need to pay various modifications or deformation that creative work can make still within protection scope of the present invention.
Claims (4)
1. a kind of multiphase transportation pipeline device, it is characterised in that including a reactor I and reactor II, described reactor I
It is connected with reactor II with same air supply system, described reactor I is provided with grouting port, reactor II top and bottom
Portion is connected by circulation line, and liquid injection port is provided with described circulation line；It is all provided with described reactor I and reactor II
There is the temperature control equipment that its temperature is adjusted, and gas hydrates in signal piping are also equipped with circulation line
The detection means of reactiveness, described detection means are connected with data handling system；
The agitating device being stirred to its inside is additionally provided with described reactor II and reactor I；In reactor II and
Reactor I outer surface is enclosed with circulation chuck, the inside of the circulation chuck with to reactor II and reactor I internal temperatures
The cooling water circulation machine being adjusted is connected；
Described circulation line is provided with detachable section；The outer ring of described detachable section is provided with circulation jacket pipe, described circulation
Jacket pipe is connected with carrying out the cooling water circulation machine of temperature adjustment to circulation line；
Described air supply system includes air accumulator, and described air accumulator is connected with reactor I, reactor II respectively by pipeline,
And be equipped with the pipeline that is connected with reactor I, reactor II of air accumulator control its cut-off control valve, gas volume flow gauge
And vavuum pump, while it is connected with gas pressure reducer in the outlet of air accumulator.
2. multiphase transportation pipeline device as claimed in claim 1, it is characterised in that described detection means includes being arranged on following
Temperature sensor, pressure sensor, laser particle analyzer, differential pressure pick-up, flowmeter on endless tube road and it is arranged on reactor
II is provided with pressure gauge and row pressure mouth.
3. a kind of hydrate generation of multiphase transportation pipeline device based on described in claim 1, the simulation side for blocking and melting
Method, it is characterised in that comprise the following steps：
Step 1, the formation to hydrate in circulation line is monitored, and establishes hydrate generation Posterior circle loine pressure and flow
Relational model；
Step 2, pressure and discharge relation model after being generated according to hydrate, actual flow and flow before hydrate generation are calculated
Ratio, criterion is thereby established, the generation blocking stage of hydrate is divided；Generated using actual flow and hydrate
The ratio of preceding flow utilizes the pressure drop that hydrate in pipeline flows and discharge relation and pipeline inner pressure as main basis for estimation
Change is turned to auxiliary judgment foundation；Hydrate Plugging in pipeline is divided into low blocked state, high-risk blocked state and completely stifled
Plug-like state；
Step 3, according to the flow of actual cycle pipeline and pressure drop parameter, the stage of its Hydrate Plugging is judged；
Step 4, the stage according to residing for hydrate proposes corresponding method for removing blockage；Low blocked state uses injecting de-plugging, high-risk
Blocked state and completely plugged state are using decompression de-plugging；
Step 5, complete de-plugging system is established.
4. the hydrate generation of multiphase transportation pipeline device as claimed in claim 3, the analogy method for blocking and melting, it is special
Sign is,
Described low blocked state uses injecting de-plugging, and its solvent injected is hydrate thermodynamic inhibitor methanol or second two
Alcohol, injecting concentration and flow are based on water content, flow, gas component in pipeline and calculated；
Described high-risk blocked state is unidirectionally depressured, pressure decay rate is controlled by air bleeding valve, together using decompression de-plugging using downstream
When monitored pipeline in gas-liquid flow velocity, control pressure decay rate ensures in pipeline that gas-liquid flow velocity is consistent with before decompression, until pipeline internal pressure
Power drops to below hydrate generation pressure；
Described completely plugged state is using de-plugging is depressured, and using upstream and downstream two-way step down, pressure decay rate is controlled by air bleeding valve,
Temperature in monitored pipeline simultaneously, temperature is not less than 0 degree Celsius in control piper；Until pipeline inner pressure drops to hydrate generation
Below pressure.
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| CN201510890234.2A CN105510529B (en) | 2015-12-04 | 2015-12-04 | Multiphase transportation pipeline device and hydrate generation, the analogy method for blocking and melting |
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|---|---|---|---|
| CN201510890234.2A CN105510529B (en) | 2015-12-04 | 2015-12-04 | Multiphase transportation pipeline device and hydrate generation, the analogy method for blocking and melting |
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| CN105510529B true CN105510529B (en) | 2018-03-09 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111707801A (en) * | 2020-06-30 | 2020-09-25 | 中国海洋石油集团有限公司 | Device and method for testing generation of natural gas hydrate under simulated flow state |
Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106322121B (en) * | 2016-08-26 | 2018-04-06 | 中国石油大学(华东) | Deep water gas well liquid loading pipeline Hydrate Plugging early monitoring device and method |
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