CN102169112B - Device and method for research of low-dosage inhibitor of natural gas hydrate - Google Patents
Device and method for research of low-dosage inhibitor of natural gas hydrate Download PDFInfo
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Abstract
The invention discloses a device for the research of a low-dosage inhibitor of a natural gas hydrate. The device comprises a gas supply system, a circulating loop system, an inhibitor adding system, a measuring and data acquiring system and a cooling system, wherein the gas supply system is used for introducing natural gas which reaches a certain pressure and humidity into the circulating loop system; the circulating loop system is used for circulating natural gas in a pipeline and simulating the generation of the natural gas hydrate in the pipeline; the inhibitor adding system is used for injecting the low-dosage inhibitor into the circulating loop system; the measuring and data acquiring system is used for measuring and acquiring data in an experiment process; and the cooling system is used for lowering the temperature of the circulating loop system. Due to the adoption of the device and a method in the scheme, the flowing situations of the hydrate under different working conditions such as horizontal pipelines, depressed pipe sections, delivery stop, restart after delivery stop and the like can be simulated, the low-dosage inhibitor of the natural hydrate is researched, accurate evaluation can be provided, and the acting effect of an experiment is approximately accordant with the using effect.
Description
Technical field
The present invention relates to a kind of apparatus and method for low-dosage inhibitor of natural gas hydrate research.
Background technology
Various lower boiling hydrocarbons such as methane, ethane, propane and carbon dioxide, sulfuretted hydrogen etc. are present in rock gas and other petroleum fluids, and water also mixes with these petroleum fluids components with different amounts simultaneously.Under cryogenic high pressure, when such petroleum fluids composition or other hydrate formations are mixed with water, can form gas hydrate, this gas hydrate is the cage type crystal that the micro-molecular gas such as water and lighter hydrocarbons form.These clathrate hydrates possibility blocking pipelines bring difficulty for exploitation or the conveying of oil and natural gas in exploitation and transport gas and other petroleum fluids processes.For example under the pressure of about 1MPa, ethane can form hydrate being lower than under 4 ℃ the temperature, is being lower than under 14 ℃ the temperature at ethane under the pressure of 3MPa to form hydrate.And these temperature and pressures are not to be of little use for many operating environments of production and transport gas and other petroleum fluids.
Tradition is to avoid and prevent the hydrate generation by the thermodynamic condition that changes the hydrate generation with thermodynamics inhibitor such as methyl alcohol, ethylene glycol.But, this type of inhibitor have the concentration height (10～60wt%), consumption is large, cost is high and the shortcoming such as strong toxicity contaminated environment, can not satisfy such as requirements such as offshore oil and gas mining operations.The at present main use of adopting low-dosage inhibitor to substitute traditional inhibitor.
About the low-dosage inhibitor performance study, mainly adopt at present autoclave both at home and abroad.High pressure reaction assembly generally is the temperature and pressure of simulation actual gas field operation, to form identical or close gas carries out hydrate in a small-sized reactor generation experiment with actual gas field, to stir the flow state that replaces real fluid, by the formation of the phenomenons such as hydrate reaction heat release, step-down indication hydrate.But existing analogue means is difficult to simulate the complex conditions of practical operation, causes the evaluation of low-dosage inhibitor not accurate enough.
Therefore, prior art awaits improving and development.
Summary of the invention
Problem to be solved by this invention is to provide a kind of apparatus and method for low-dosage inhibitor of natural gas hydrate research, to estimate accurately low-dosage inhibitor, its laboratory action effect and actual oil field result of use is roughly met.
In order to solve the problems of the technologies described above, technical scheme of the present invention is as follows:
A kind of device for low-dosage inhibitor of natural gas hydrate research comprises:
Air supply system passes into the closed circuit system after the control rock gas reaches certain pressure and humidity;
The closed circuit system circulates rock gas in pipeline, the simulation gas hydrate are in ducted generation;
The inhibitor add-on system is used for injecting low-dosage inhibitor to the closed circuit system;
Measure and data acquisition system (DAS), measure and gather the data in the experimentation;
Cooling system is for reducing the temperature of closed circuit system.
Described device for low-dosage inhibitor of natural gas hydrate research, described air supply system comprises source of the gas, damping device and supercharging device.
Described device for low-dosage inhibitor of natural gas hydrate research, described closed circuit system comprises magnetic force ebullator and circulating line and gas-liquid separation device.
Described device for low-dosage inhibitor of natural gas hydrate research, described closed circuit system further comprises be used to the gas-liquid separation device of getting rid of unnecessary liquid.
Described device for low-dosage inhibitor of natural gas hydrate research, low-lying place and the level place of described circulating line are provided with respectively transparent window.
Described device for low-dosage inhibitor of natural gas hydrate research, temperature, pressure, flow velocity and humidity data in described measurement and data acquisition system (DAS) measurement and the acquisition system.
Described device for low-dosage inhibitor of natural gas hydrate research, it is 15MPa that whole device maximum is born pressure.
Described device for low-dosage inhibitor of natural gas hydrate research, described circulating line length is 20 meters.
A kind of method for low-dosage inhibitor of natural gas hydrate research, adopt described device for low-dosage inhibitor of natural gas hydrate research, and comprise following steps:
A, low-dosage inhibitor is placed the inhibitor add-on system;
B, purge whole process pipeline and device with rock gas;
C, by air supply system with rock gas carry out humidification, the pressurization after pass in the closed circuit system;
D, unlatching cooling system, slow cooling;
E, the humidity by rock gas and content of water in system are calculated the rate of injection of low-dosage inhibitor, and the rock gas that flows in the closed circuit system injects low-dosage inhibitor;
F, by measuring and data acquisition system (DAS) judges that the system hydrate generates situation and generates induction period, thereby determine the effect of low-dosage inhibitor.
Described method for low-dosage inhibitor of natural gas hydrate research among the described step a, is configured to the concentration of concentration range between 0.01%-5% with low-dosage inhibitor.
Adopt such scheme, apparatus and method of the present invention can dummy level pipeline, landform indentation pipeline section, stopping transportation and the different operating modes such as restart after shutdown under the hydrate mobility status, be similar to as far as possible high pressure, low temperature complex situations in the actual oil field, be used for the research of the low-dosage inhibitor of natural gas hydrate, can provide accurately and estimate, its laboratory action effect and result of use are roughly met.By in the circulating line of closed circuit, transparent window being set, can directly observe the forming process of hydrate, more intuitive research effect is provided.
Description of drawings
Fig. 1 is the synoptic diagram of a kind of embodiment of apparatus of the present invention.
Embodiment
Below in conjunction with accompanying drawing, preferred embodiment of the present invention is described in further detail.
Each mark is expressed as follows in the accompanying drawing 1:
The RTD temperature sensor; The P pressure transducer; The DP differential pressure gauge;
1 source of the gas; 2 damping devices; 3 supercharge pumps; 4 dew point hygrometers; 5 flowmeters; 6 gas storage fluid reservoirs; 7 magnetic force ebullators; 8 transparent sight holes; 9 gas-liquid separation devices; 10 inhibitor storage tanks; 11 syringe pumps; 12 low temperature chambers;
The V1 reduction valve; V2-V21 is common valve.
As shown in Figure 1, low-dosage inhibitor of natural gas hydrate research device of the present invention in the present embodiment, designs its maximum and bears pressure 15MPa.
Air supply system mainly is comprised of source of the gas 1, damping device 2 and supercharge pump 3.Source of the gas 1 uses gas cylinder, and gas out enters damping device 2 afterwards from gas cylinder, enters supercharge pump 3 by regulating after temperature makes gas meet the requirements of humidity, and supercharge pump 3 guarantees that gas reached required pressure before entering the closed circuit system.
The closed circuit system is the core of whole device, includes magnetic force ebullator 7,20 mitron roads, gas-liquid separator and some measuring sensors, main mobile research as simulation pipeline inner fluid.
The inhibitor adding set mainly comprises inhibitor storage tank 10 and syringe pump 11, and low-dosage inhibitor speed as required is injected in the pipeline.
Measurement and data acquisition system (DAS) mainly are used as measurement and the collection of temperature, pressure, flow velocity and the humidity etc. of whole system.
Cooling device refers to low temperature chamber 12 in the present embodiment, and whole closed circuit partly is placed in one.
Source of the gas 1 links to each other with humidifying container 2 by reduction valve V1, and humidifying container 2 can be regulated temperature; Humidifying container 2 is connected connections by valve V3 with supercharge pump, gas can be gathered from the exit of supercharge pump 3, with dew point hygrometer 4 measurement humidity; Directly enter closed circuit through the gas behind the supercharge pump 3 after by flowmeter 5; Enter gas behind the closed circuit at first by ebullator 7, enter circulating line through behind the flowmeter subsequently, pass through successively the horizontal see-through section with transparent sight hole 8, low-lying transparent pipeline, the loop fluid is through gas-liquid separator 9, gas is got back to magnetic force ebullator 7, liquid adds the loop through the V21 entry inhibitor, thereby unnecessary liquid is got rid of from closed circuit; Low-dosage inhibitor in the inhibitor storage tank 10 is injected into the exit of magnetic force ebullator 7 by flowmeter and syringe pump 11; Liquid storage gas-holder 6 is the gas in the removing system and liquid and storage after reaction finishes.Low temperature chamber 12 provides low temperature environment for whole annular closed circuit.
Between humidifying container 2/ supercharge pump 3 and the closed circuit, all be provided with temperature sensor and pressure transducer between each pipeline of closed circuit; Gas all is furnished with gas meter before entering closed circuit and in the cyclic process; Inhibitor is provided with liquid flowmeter before injecting closed circuit; Be provided with differential pressure gauge between circulating-pump outlet and the entrance and between the outlet 10m-15m; These surveying instruments have consisted of measurement and the data acquisition system (DAS) in the present embodiment.
In device of the present invention, can dummy level pipeline, landform indentation pipeline section, stopping transportation and the different operating modes such as restart after shutdown under the hydrate mobility status.
Gas out enters damping device 2 from source of the gas 1 in the experimentation, come the humidity of adjustments of gas by the control temperature, after reaching requirement humidity, pass through supercharge pump 3 superchargings, gas after the supercharging enters the loop checking installation that is arranged in low temperature chamber 12, through in 20 meters pipeline, flowing behind the magnetic force ebullator 7, by gas-liquid separation device, gas is got back to magnetic force ebullator 7 entrances, enters next time circulation.In magnetic force ebullator 7 exits, be added with the low-dosage inhibitor injection device, the injection flow is by syringe pump 11 controls.
More specifically, the method for the invention comprises the steps:
A, in damping device, add an amount of water; Low-dosage inhibitor is configured to the concentration of concentration range between 0.01%-5%, places inhibitor storage tank 10;
B, purge whole process pipeline and device with rock gas;
C, open source of the gas 1 and V1, in damping device 2, pass into gas, open V3 after 10 minutes, to the closed circuit air feed, start simultaneously magnetic force ebullator 7 by supercharge pump 3.
D, unlatching low temperature chamber 12, slow cooling.
E, calculate the rate of injection of syringe pump 11 by gas humidity and content of water in system, start syringe pump 11, injecting inhibitor in the gas that flows.
Gas flow situation and hydrate in f, the 8 observation pipelines of the transparent sight hole by low-lying place and level place generate situation, judge that in conjunction with the instant parameter that differential pressure gauge and flowmeter and temperature, pressure measurement mechanism gather the system hydrate generates situation and generates induction period.
Consistent for hydrate production in maximum possible and the actual Oilfield gas course of conveying, the water source that generates hydrate in the whole reaction system is used for the aqueous water of dissolution inhibitor when mainly being gas is carried secretly in low temperature chamber 12 outer humidification devices 2 water vapor and injecting inhibitor.
Should be understood that, for those of ordinary skills, can be improved according to the above description or conversion, and all these improvement and conversion all should belong to the protection domain of claims of the present invention.
Claims (9)
1. a device that is used for low-dosage inhibitor of natural gas hydrate research is characterized in that, comprising:
Air supply system passes into the closed circuit system after the control rock gas reaches certain pressure and humidity;
The closed circuit system circulates rock gas in pipeline, the simulation gas hydrate are in ducted generation;
The inhibitor add-on system is used for injecting low-dosage inhibitor to the closed circuit system;
Measure and data acquisition system (DAS), measure and gather the data in the experimentation;
Cooling system is for reducing the temperature of closed circuit system;
Described air supply system comprises source of the gas, damping device and supercharging device.
2. the device for low-dosage inhibitor of natural gas hydrate research according to claim 1 is characterized in that, described closed circuit system comprises ebullator and circulating line.
3. the device for low-dosage inhibitor of natural gas hydrate research according to claim 2 is characterized in that, described closed circuit system further comprises be used to the gas-liquid separation device of getting rid of unnecessary liquid.
4. the device for low-dosage inhibitor of natural gas hydrate research according to claim 3 is characterized in that low-lying place and the level place of described circulating line are provided with respectively transparent window.
5. the device for low-dosage inhibitor of natural gas hydrate research according to claim 4 is characterized in that, temperature, pressure, flow velocity and humidity data in described measurement and data acquisition system (DAS) measurement and the acquisition system.
6. the device for low-dosage inhibitor of natural gas hydrate research according to claim 5 is characterized in that it is 15MPa that whole device maximum is born pressure.
7. the device for low-dosage inhibitor of natural gas hydrate research according to claim 6 is characterized in that described circulating line length is 20 meters.
8. a method that is used for low-dosage inhibitor of natural gas hydrate research is characterized in that, adopts device according to claim 1, and comprises following steps:
A, low-dosage inhibitor is placed the inhibitor add-on system;
B, purge whole process pipeline and device with rock gas;
C, by air supply system with rock gas carry out humidification, the pressurization after pass in the closed circuit system;
D, unlatching cooling system, slow cooling;
E, the humidity by rock gas and content of water in system are calculated the rate of injection of low-dosage inhibitor, and the rock gas that flows in the closed circuit system injects low-dosage inhibitor;
F, by measuring and data acquisition system (DAS) judges that the system hydrate generates situation and generates induction period, thereby determine the effect of low-dosage inhibitor.
9. the method for low-dosage inhibitor of natural gas hydrate research according to claim 8 is characterized in that, among the described step a, low-dosage inhibitor is configured to the concentration of concentration range between 0.01%-5%.
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| CA2891850C (en) * | 2012-11-26 | 2021-03-30 | Statoil Petroleum As | Combined dehydration of gas and inhibition of liquid from a well stream |
| CN103571557B (en) * | 2013-11-12 | 2014-12-24 | 北京化工大学 | Method for preparing natural gas hydrate |
| CN104088623B (en) * | 2014-06-19 | 2015-05-27 | 中国石油大学(华东) | Automatic hydrate preventing device for deep water gas well test and preventing method |
| CN105445142B (en) * | 2014-09-02 | 2019-03-26 | 中国海洋石油集团有限公司 | Mobile natural gas hydrate evaluating apparatus |
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| CN109238640A (en) * | 2018-09-21 | 2019-01-18 | 大连理工大学 | A kind of hydrate observation device applied to the flowing safety experiment circulatory system |
| CN109341760B (en) * | 2018-09-21 | 2020-08-07 | 大连理工大学 | Full-visual circulating pipeline system applied to research on hydrate blockage |
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| CN111189957A (en) * | 2018-11-14 | 2020-05-22 | 中国石油化工股份有限公司 | Gas hydrate inhibitor performance evaluation system |
| CN111189746A (en) * | 2018-11-14 | 2020-05-22 | 中国石油化工股份有限公司 | Performance evaluation method and application of gas hydrate inhibitor |
| CN110865153B (en) * | 2019-12-02 | 2022-04-29 | 东北石油大学 | Hydrate multiphase flow loop experiment device and experiment method |
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