CN111189746A - Performance evaluation method and application of gas hydrate inhibitor - Google Patents
Performance evaluation method and application of gas hydrate inhibitor Download PDFInfo
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Abstract
The invention discloses a performance evaluation method and application of a gas hydrate inhibitor, wherein the evaluation system comprises a constant temperature experiment box, a reaction kettle and a data control/acquisition system, the reaction kettle is fixed on a stabilizing support, a stirring motor is fixedly arranged below the stabilizing support, a visible window is also arranged on the reaction kettle, a temperature sensor and a high-pressure online viscosity tester are arranged at the bottom of the reaction kettle, the bottom of the reaction kettle is connected with a medicament filling pump, a pressure sensor is arranged at the top of the reaction kettle, the top of the reaction kettle is respectively connected with a high-pressure natural gas steel cylinder and a vacuum pump, a stirring rod is arranged in the reaction kettle, and at least two stirring paddles are fixed on the stirring rod. The invention has the functions of visual observation, on-line medicament filling and on-line viscosity measurement, can quickly and effectively evaluate the performance of different gas hydrate inhibitors of the type, and has the characteristics of short test time, simple operation, complete functions, high precision, good experimental repeatability and the like.
Description
Technical Field
The invention relates to the technical field of inhibitor performance evaluation, in particular to a method for evaluating the performance of a gas hydrate inhibitor and application thereof.
Background
The gas hydrate is formed by gas molecules (CH)4、C2H6And CO2Etc.) form non-stoichiometric crystalline cages with water molecules under low temperature and high pressure conditions, often referred to as combustible ice. The flow safety problem caused by hydrate blockage has long plagued the oil and gas production and gathering sector. After the hydrate is formed in some pipe sections (elbow valves, throttling devices, etc.) of a gas transmission main line or a gas transmission station, the flow area of natural gas is reduced, so that local blockage is formed, the upstream pressure is increased, the flow is reduced, the downstream pressure is reduced, and the normal operation of gas transmission and distribution of a pipeline is influenced. Meanwhile, if the hydrate is formed at the throttling orifice, the accuracy of the natural gas flow metering is also influenced. If not in timeThe hydrate is removed, and the pipeline can be seriously jammed, so that the pressure of the upstream natural gas is sharply increased, and equipment damage and personnel injury accidents are caused.
The hydrate risk prevention and control technology mainly comprises a traditional thermodynamic inhibition method and a method for adding a low-dose hydrate inhibitor. The traditional thermodynamic inhibition method changes the thermodynamic formation conditions of system hydrates by mainly removing a water phase, heating a pipeline, reducing pressure, adding hydrate thermodynamic inhibitors (methanol, ethylene glycol and the like) and the like, so that no hydrate is formed in the pipeline transportation process. However, the method has great application limitation, for example, when a hydrate thermodynamic inhibitor is added, the dosage is large, which is usually 30-50% of the water content of the system, the cost is high, the toxicity is high, the environmental pollution is easy to cause, and the like. The low-dose inhibitor comprises two types of hydrate inhibitor and kinetic inhibitor. Hydrate inhibitors are generally polymers and surfactants that can only be used when both oil and water phases are present. The hydrate inhibitor does not change the generation condition of the hydrate, allows the formation of the hydrate in the system, but can control the size of hydrate particles, prevent the accumulation of the hydrate particles and finally enable the hydrate particles to be transported in stable slurry. However, this type of polymerization inhibitor can generally be used only in the presence of an oil phase, and is limited in application to high-pressure natural gas gathering and transportation systems. The hydrate kinetic inhibitor is generally some water-soluble high molecular polymers, does not change the thermodynamic equilibrium condition of the system hydrate, but is adsorbed on the surface of hydrate particles in the initial nucleation and growth stage of the hydrate, and the annular structure of the kinetic inhibitor is combined with hydrate crystals through hydrogen bonds, so that the further growth of hydrate crystal grains is prevented or delayed, and the condition that no blockage occurs in the conveying process is ensured.
Currently, the devices used to screen and evaluate inhibitor performance are typically autoclaves and simulated flow lines. Most of the traditional high-pressure reaction kettle devices are blind kettles without visual windows, the performance of the hydrate inhibitor is qualitatively judged through the temperature and pressure changes in the hydrate forming process, and the defects of poor evaluation effect, low precision, poor repeatability and the like exist; the device for simulating the flowing pipeline is complex, occupies a large space, has high cost and long period in a single experiment, and is not convenient for the performance evaluation of the inhibitor in the early stage. In addition, a differential scanning calorimeter can be used to study the inhibition performance, but the equipment is expensive, and the maintenance and experimental costs thereof are high.
Chinese patent CN101692077B discloses a hydrate inhibitor performance evaluation device, which is characterized in that high-pressure stainless steel reaction kettles are subjected to simultaneous reaction at the same pressure and temperature, and pressure and temperature changes in the reaction process are recorded by a data acquisition instrument to judge the generation time of hydrates.
Chinese patent CN104807821B discloses a swing reaction device for evaluating hydrate inhibitor performance, which comprises a thermostat, an air intake system, a liquid inlet system, a high pressure reactor arranged in the thermostat, a swing system, and a data acquisition system, but the device cannot effectively measure the viscosity change of hydrate formation process of a hydrate inhibitor-containing system, and cannot complete the filling of a medicament in the experimental process.
Disclosure of Invention
In order to solve the technical problems, the invention discloses a method for evaluating the performance of a gas hydrate inhibitor and application thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for evaluating the performance of a gas hydrate inhibitor comprises a constant temperature experiment box, a reaction kettle and a data control/acquisition system, wherein the reaction kettle is arranged in the constant temperature experiment box, the reaction kettle provided with a top cover is fixed on a stabilizing support, a stirring motor is fixedly arranged below the stabilizing support, a visible window is also arranged on the reaction kettle, a temperature sensor and a high-pressure online viscosity tester are arranged at the bottom of the reaction kettle, the bottom of the reaction kettle is also connected with a medicament filling pump through a pipeline, a pressure sensor is also arranged at the top of the reaction kettle, the top of the reaction kettle is also respectively connected with a high-pressure natural gas steel cylinder and a vacuum pump through pipelines, and a three-way valve and a third stop valve are arranged on the pipeline connecting the reaction kettle and the high-pressure natural gas steel;
the method sequentially comprises the following steps:
(1) closing the three-way valve, opening the second stop valve, opening the vacuum pump and the fourth stop valve, opening the first stop valve, and slowly pumping the test liquid into the reaction kettle by using vacuum;
(2) closing the second stop valve, continuously vacuumizing for more than 30min, and simultaneously adjusting the temperature of the constant-temperature experiment box to reach the temperature required by the experiment;
(3) monitoring the temperature change in the reaction kettle on line through a temperature sensor, starting a stirring motor after the temperature in the reaction kettle reaches the experiment temperature, and adjusting the stirring speed required by the experiment; opening a three-way valve at the top of the reaction kettle, introducing high-pressure natural gas into the reaction kettle, and closing the three-way valve to start an experiment after the pressure required by the experiment is reached;
(4) macroscopic morphological change in the reaction kettle and the change conditions of temperature, pressure and system viscosity in the experimental process are monitored on line through a visible window, a temperature sensor, a pressure sensor and a high-pressure online viscosity tester which are arranged on the reaction kettle;
(5) after the experiment is finished, the temperature of the constant temperature experiment box is adjusted to 35 ℃, the three-way valve is opened, the gas in the reaction kettle is slowly discharged, then the second stop valve at the bottom of the reaction kettle is opened, and the test solution is discharged out of the reaction kettle.
The performance evaluation method of the gas hydrate inhibitor is applied to the performance evaluation of a thermodynamic inhibitor and a kinetic inhibitor, and mainly comprises the steps of comparing the length of the induction time (the time from the beginning of an experiment to the time when hydrate particles are found in a system) for the formation of the hydrate, combining a visual window, a temperature sensor and a pressure sensor in the experiment process, and comparing the length of the time from the beginning of the experiment to the time when the hydrate particles appear in the system (penetrate through the visual window) or the time when the pressure suddenly decreases or the temperature suddenly increases to an inflection point, wherein if the required time is longer, the performance of the inhibitor is better.
The performance of the hydrate polymerization inhibitor is quantitatively evaluated by comparing the viscosity of a system after the hydrate is formed and combining a high-pressure online viscosity tester in the experimental process, and the smaller the viscosity is, the better the performance of the hydrate polymerization inhibitor is.
Further, the visible window is connected with the kettle body of the reaction kettle through a plurality of fixing nuts, a stirring rod connected with a stirring motor is arranged inside the reaction kettle, and at least two stirring paddles are fixed on the stirring rod.
Furthermore, a first stop valve is further arranged on a pipeline connecting the reaction kettle and the medicament filling pump.
Further, the medication filling pump is also connected to the data control/acquisition system.
Further, the bottom of reation kettle still sets up the leakage fluid dram, sets up the second stop valve on the leakage fluid dram.
Further, the temperature sensor, the pressure sensor and the high-pressure on-line viscosity measuring instrument are respectively connected to the data control/acquisition system.
Further, a fourth stop valve is further arranged on a pipeline connecting the reaction kettle and the vacuum pump.
Compared with the prior art, the invention has the advantages that the visual window is arranged, the visual observation effect is realized, the functions of online medicament filling and online viscosity measurement are realized, the performances of different gas hydrate inhibitors of the type can be quickly and effectively evaluated, the characteristics of short test time, simple operation, complete functions, high precision, good experimental repeatability and the like are realized, and the defects of single function, long test period and the like of the conventional evaluation device at present are overcome.
Drawings
FIG. 1 is a schematic view of the structure of the present invention.
Wherein, 1-a reaction kettle; 2-a visible window; 3-fixing the gasket; 4-fixing the nut; 5-a stirring rod; 6-stirring paddle; 7-a first stop valve; 8-a second stop valve; 9-medicament filling pump; 10-a stabilizing scaffold; 11-a stirring motor; 12-high pressure on-line viscometers; 13-a temperature sensor; 14-a pressure sensor; 15-three-way valve; 16-a screw; 17-a third stop valve; 18-high pressure natural gas cylinders; 19-a fourth stop valve; 20-a vacuum pump; 21-constant temperature experiment box; 22-data control/acquisition system.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in the figure, the evaluation system comprises a constant temperature experiment box 21, a reaction kettle 1 arranged in the constant temperature experiment box 21 and a data control/acquisition system 22, wherein the constant temperature experiment box 21 is used for controlling the temperature of the reaction kettle 1; the reaction kettle 1 provided with the top cover is fixed on a stabilizing support 10, the top cover is connected with the upper part of a kettle body of the reaction kettle 1 through a screw 16, a stirring motor 11 is fixedly arranged below the stabilizing support 10, a visible window 2 is also arranged on the reaction kettle 1, the visible window 2 is connected with the kettle body of the reaction kettle 1 through a plurality of fixing nuts 4, the visible window 2 is used for observing the macroscopic morphological change of the hydrate formation process in the reaction kettle 1 in the experimental process, and each fixing nut 4 is provided with a fixing gasket 3; the bottom of the reaction kettle 1 is provided with a temperature sensor 13 and a high-pressure online viscosity tester 12, the temperature sensor 13 is used for monitoring the temperature change condition in the reaction kettle 1 in the experimental process on line, and the high-pressure online viscosity tester 12 is used for measuring the system viscosity change condition in the reaction kettle 1 in the experimental process on line; the bottom of the reaction kettle 1 is also connected with a medicament filling pump 9 through a pipeline, the top of the reaction kettle 1 is also provided with a pressure sensor 14, the pressure sensor 14 is used for monitoring the pressure change condition in the reaction kettle 1 in the experimental process on line, the top of the reaction kettle 1 is also respectively connected with a high-pressure natural gas steel cylinder 18 and a vacuum pump 20 through pipelines, and the vacuum pump 20 is mainly used for vacuumizing the reaction kettle 1 before the experiment to remove the influence of impurity gas; a three-way valve 15 and a third stop valve 17 are arranged on a pipeline connecting the reaction kettle 1 and the high-pressure natural gas steel cylinder 18, and the three-way valve 15 is used for introducing high-pressure gas before an experiment and discharging gas after the experiment; the reaction kettle 1 is internally provided with a stirring rod 5 connected with a stirring motor 11, at least two stirring paddles 6 are fixed on the stirring rod 5, and the system in the reaction kettle 1 is stirred by the stirring paddles 6.
In particular, a first stop valve 7 is arranged on a pipeline connecting the reaction kettle 1 and the medicament filling pump 9.
In particular, a chemical filling pump 9 is also connected to the data control/acquisition system 22, and the chemical filling pump 9 can be used for filling different types of hydrate inhibitors into the reaction kettle 1 during the experiment.
Particularly, the bottom of reaction kettle 1 still sets up the leakage fluid dram, sets up second stop valve 8 on the leakage fluid dram for test solution's suction before the experiment and test solution's discharge after the experiment.
Specifically, the temperature sensor 13, the pressure sensor 14 and the high-pressure on-line viscometer 12 are respectively connected to a data control/acquisition system 22, and the data control/acquisition system 22 performs data control and on-line acquisition on the high-pressure on-line viscometer 12, the temperature sensor 13 and the pressure sensor 14.
In particular, a fourth stop valve 19 is further disposed on a pipeline connecting the reaction kettle 1 and the vacuum pump 20.
The performance evaluation method of the gas hydrate inhibitor is applied to the performance evaluation of a thermodynamic inhibitor and a kinetic inhibitor, and mainly comprises the steps of comparing the induction time (the time from the beginning of an experiment to the time when hydrate particles are found in a system) of the formation of a hydrate, combining a visual window 2, a temperature sensor 13 and a pressure sensor 14 in the experimental process, and comparing the time from the beginning of the experiment to the time when the hydrate particles appear in the system (penetrate through the visual window 2) or the time when the pressure of the system suddenly decreases or the temperature suddenly increases to an inflection point, wherein if the required time is longer, the performance of the inhibitor is better.
The performance of the hydrate polymerization inhibitor is quantitatively evaluated by comparing the viscosity of a system after the hydrate is formed and combining a high-pressure online viscosity tester 12 in the experimental process, and the performance of the hydrate polymerization inhibitor is evaluated by comparing the viscosity of the system after the hydrate is formed in a reaction kettle 1, wherein the lower the viscosity is, the better the performance of the hydrate polymerization inhibitor is.
A method for evaluating the performance of a gas hydrate inhibitor sequentially comprises the following steps:
(1) closing the three-way valve 15, opening the second stop valve 8, opening the vacuum pump 20 and the fourth stop valve 19, opening the first stop valve 7, and slowly pumping the test liquid into the reaction kettle 1 by using vacuum;
(2) closing the second stop valve 8, continuously vacuumizing for more than 30min to remove impurity gases in the reaction kettle 1, and simultaneously adjusting the temperature of the constant temperature experiment box 21 to reach the temperature required by the experiment;
(3) monitoring the temperature change in the reaction kettle 1 on line through a temperature sensor 13, starting a stirring motor 11 after the temperature in the reaction kettle 1 reaches the experiment temperature, and adjusting the stirring speed required by the experiment; opening a three-way valve 15 at the top of the reaction kettle 1, introducing high-pressure natural gas into the reaction kettle 1, and closing the three-way valve 15 to start an experiment after the pressure required by the experiment is reached;
(4) through a visible window 2, a temperature sensor 13, a pressure sensor 14 and a high-pressure online viscosity tester 12 which are arranged on the reaction kettle 1, the macroscopic form change and the temperature, pressure and system viscosity change conditions in the reaction kettle 1 in the experimental process are monitored online, so that the method can be used for evaluating the performance of a hydrate inhibitor test solution prepared in advance at a certain concentration and also can be used for evaluating the performance of a hydrate inhibitor adding condition in the experimental process;
(5) after the experiment, the temperature of the constant temperature experiment box 21 is adjusted to 35 ℃, the three-way valve 15 is opened, the gas in the reaction kettle 1 is slowly discharged, then the second stop valve 8 at the bottom of the reaction kettle 1 is opened, and the test solution is discharged out of the reaction kettle 1.
It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art may make modifications, alterations, additions or substitutions within the spirit and scope of the present invention.
Claims (9)
1. A method for evaluating the performance of a gas hydrate inhibitor is characterized in that an evaluation system comprises a constant temperature experiment box, a reaction kettle and a data control/acquisition system, wherein the reaction kettle and the data control/acquisition system are arranged in the constant temperature experiment box;
the method sequentially comprises the following steps:
(1) closing the three-way valve, opening the second stop valve, opening the vacuum pump and the fourth stop valve, opening the first stop valve, and slowly pumping the test liquid into the reaction kettle by using vacuum;
(2) closing the second stop valve, continuously vacuumizing for more than 30min, and simultaneously adjusting the temperature of the constant-temperature experiment box to reach the temperature required by the experiment;
(3) monitoring the temperature change in the reaction kettle on line through a temperature sensor, starting a stirring motor after the temperature in the reaction kettle reaches the experiment temperature, and adjusting the stirring speed required by the experiment; opening a three-way valve at the top of the reaction kettle, introducing high-pressure natural gas into the reaction kettle, and closing the three-way valve to start an experiment after the pressure required by the experiment is reached;
(4) macroscopic morphological change in the reaction kettle and the change conditions of temperature, pressure and system viscosity in the experimental process are monitored on line through a visible window, a temperature sensor, a pressure sensor and a high-pressure online viscosity tester which are arranged on the reaction kettle;
(5) after the experiment is finished, the temperature of the constant temperature experiment box is adjusted to 35 ℃, the three-way valve is opened, the gas in the reaction kettle is slowly discharged, then the second stop valve at the bottom of the reaction kettle is opened, and the test solution is discharged out of the reaction kettle.
2. Use of the method of evaluating the performance of a gas hydrate inhibitor according to claim 1 for the evaluation of the performance of thermodynamic and kinetic inhibitors.
3. Use of the method for evaluating the performance of a gas hydrate inhibitor according to claim 1 for evaluating the performance of a hydrate inhibitor.
4. The method for evaluating the performance of the gas hydrate inhibitor according to claim 1, wherein the visible window is connected with the kettle body of the reaction kettle through a plurality of fixing nuts, a stirring rod connected with a stirring motor is installed inside the reaction kettle, and at least two stirring paddles are fixed on the stirring rod.
5. The method for evaluating the performance of a gas hydrate inhibitor according to claim 4, wherein a first stop valve is further arranged on a pipeline connecting the reaction kettle and the chemical filling pump.
6. A method as claimed in claim 4, wherein the filling pump is also connected to the data control/acquisition system.
7. The method for evaluating the performance of the gas hydrate inhibitor according to claim 4, wherein a liquid outlet is further arranged at the bottom of the reaction kettle, and a second stop valve is arranged on the liquid outlet.
8. The method for evaluating the performance of a gas hydrate inhibitor according to claim 4, wherein the temperature sensor, the pressure sensor and the high-pressure on-line viscometer are respectively connected to the data control/acquisition system.
9. The method for evaluating the performance of a gas hydrate inhibitor according to claim 4, wherein a fourth stop valve is further arranged on a pipeline connecting the reaction kettle and the vacuum pump.
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Cited By (4)
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| CN112362690A (en) * | 2020-11-06 | 2021-02-12 | 西南石油大学 | Hydrate generation induction time measuring device |
| CN112619559A (en) * | 2020-12-10 | 2021-04-09 | 中国海洋石油集团有限公司 | Device and method for preparing oil main phase hydrate suspension |
| CN113607883A (en) * | 2021-07-12 | 2021-11-05 | 长江大学 | Comprehensive evaluation method of natural gas hydrate inhibitor |
| CN114019115A (en) * | 2022-01-06 | 2022-02-08 | 清华大学深圳国际研究生院 | Reaction system and method for rapidly screening hydrate inhibitor |
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| CN112362690A (en) * | 2020-11-06 | 2021-02-12 | 西南石油大学 | Hydrate generation induction time measuring device |
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| CN113607883A (en) * | 2021-07-12 | 2021-11-05 | 长江大学 | Comprehensive evaluation method of natural gas hydrate inhibitor |
| CN114019115A (en) * | 2022-01-06 | 2022-02-08 | 清华大学深圳国际研究生院 | Reaction system and method for rapidly screening hydrate inhibitor |
| CN114019115B (en) * | 2022-01-06 | 2022-03-18 | 清华大学深圳国际研究生院 | Reaction system and method for rapidly screening hydrate inhibitor |
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Application publication date: 20200522 |
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