CN115541458A - High-pressure oil-gas-water mixture wax deposition simulation experiment device - Google Patents

Abstract

The invention discloses a high-pressure oil-gas-water mixture wax deposition simulation experiment device, which simulates the flow in an actual pipeline through the circulation of fluid in a high-pressure reaction kettle and a fluid loop system outside the kettle, wherein two relatively independent blocks are separated from the kettle body by a stainless steel plate, a cold finger is respectively arranged at each block, the temperature of the cold finger is controlled by a connected refrigeration thermostatic bath, the deposition occurs in a specific area without the coverage of an insulating layer, the temperature in the kettle is controlled by a thermostatic bath, on-line additive in the experiment can be realized by an additive tube, a high-pressure additive device and the like, on-line sampling and microscopic observation under high pressure are completed through a sampling tube, a sampling device, a high-pressure microscopic holder and the like, and the device also comprises auxiliary equipment for realizing gas-liquid injection and vacuum generation. The experimental device provided by the invention can realize the visualization of wax deposition simulation experiments and the process thereof under the mixed transportation of high-pressure oil, gas and water, and the experiment device can be used for simultaneously carrying out two groups of parallel experiments or experiments which are mutually contrasted, so that the experiment times and the gas and liquid consumption are reduced, and the experiment efficiency is improved.

Description

High-pressure oil-gas-water mixture wax deposition simulation experiment device

Technical Field

The embodiment of the invention relates to a wax deposition indoor simulation experiment in an oil gas storage and transportation flow guarantee link, in particular to an oil gas water mixture wax solid phase deposition simulation experiment device under high pressure.

Background

Currently, global demand for crude oil is still steadily increasing, and the International Energy Agency (IEA) reports in 2021 that: the long-term growth driver will continue to push the demand for oil high. By 2026, global oil demand is expected to reach 104.1 million barrels per day, and the center of gravity of product trade will shift to asia, resulting in an increase in oil import dependence to 82% in the local region of the year. The high-efficiency transportation of oil products is very important for the energy safety of China. Among other things, the challenges of production optimization and cost reduction drive up innovation of processing strategies. Wax deposition is an important flow guarantee problem in the petroleum industry, and the wax deposition problem in the pipeline transportation process of the wax-containing crude oil reduces the effective flow area in the pipeline, causes unnecessary energy loss, and affects different links from an oil storage layer to blockage of the pipeline and process equipment. With the development of a large number of marginal oil and gas fields and unconventional oil and gas reservoirs, an oil-gas-water high-pressure mixed transportation process is widely adopted, most domestic crude oil belongs to high-wax crude oil, and the risk of depositing a wax layer on the pipe wall under the influence of transportation conditions in the pipe transportation process is high. The traditional wax deposition simulation experiment is usually carried out under normal pressure, and the site condition of coexistence of oil, gas and water under high pressure cannot obtain better simulation effect. The cold finger experiment is widely used for wax deposition simulation due to simple operation, small occupied area and convenience, most of the existing devices are limited by experiment operation conditions, the flowing of an actual pipeline cannot be well simulated, and usually a group of experiments need to be repeated for several times to take an average value so as to eliminate accidental errors, so that the characteristics of inaccurate experiment data, large experiment amount and long experiment period are caused. From this, need design a high-pressure oil gas water mixture wax deposit simulation experiment device based on cold finger principle, can reach simultaneously and reduce the experiment number of times, promote the purpose of experimental efficiency.

Disclosure of Invention

Aiming at the technical problems, the invention provides a high-pressure oil-gas-water mixture wax deposition simulation experiment device, which is used for realizing a wax deposition simulation experiment and a visualization process under the oil-gas-water mixed transportation condition in a high-pressure environment. The device is easy to operate, convenient and visual, has various functions, can simultaneously carry out two groups of relatively independent cold finger experiments, and can also observe the improvement condition of the additive on the gelled microstructure of the wax oil and the generation condition of wax deposited crystals and hydrates under high pressure and low temperature on line.

The technical scheme adopted by the invention is as follows:

the utility model provides a high-pressure oil gas water mixture wax deposit simulation experiment device, is including the high-pressure batch autoclave that is equipped with the visual window, there is a withstand voltage corrosion resistant plate at the middle part in the high-pressure batch autoclave, steel sheet axial cross section and the internal diameter coincidence of cauldron, divide into two relatively independent regions with the cauldron internal, the cauldron body respectively has a section distance not separated by the steel sheet topmost and bottommost, respectively have a stirring rake and cold finger in two regions, two axle centers and two semicircle cross-section shape heart coincidences of cavity, two pair cold fingers link to each other with a refrigeration constant temperature tank respectively, refrigeration constant temperature tank for control cold finger temperature, two pairs of stirring rakes link to each other with agitator motor separately, high-pressure oil gas water mixture wax deposit simulation experiment device still includes high-pressure batch autoclave external fluid loop system, and this system mainly comprises high-pressure heterogeneous transport circulating pump and heterogeneous flowmeter for realize the extrinsic cycle of oil mixture in the reation kettle, high-pressure oil gas water mixture wax deposit simulation experiment device still includes injection system and vacuum generation system, high-pressure oil gas water mixture wax deposit simulation experiment device still includes the online additive and the visual gas water mixture system of online sample under the high-pressure environment and sample.

The invention provides a method for simulating wax deposition of an oil-gas-water mixture in a high-pressure pipeline by using the device, which comprises the following steps:

1) Opening a vacuum generating system, exhausting gas in the high-pressure reaction kettle and residual gas in the loop system to ensure that the high-pressure reaction kettle and the loop system have certain vacuum degree, and when the negative pressure can be stably maintained for a certain time, considering that the device has good air tightness, and carrying out the next experiment;

2) The device and all valves are checked, a constant temperature bath is opened, the temperature of a temperature control system is set to be 50 ℃, and experimental fluid is heated to eliminate heat influence;

3) Injecting an oil-water mixture into the high-pressure reaction kettle and the loop system through a liquid injection system;

4) Injecting high-pressure gas into the high-pressure reaction kettle and the loop system through a high-pressure gas injection system;

5) Opening the two stirring motors, and driving the stirring paddles to fully mix oil, gas and water in the reaction kettle;

6) According to the experimental scheme, the temperature of a constant temperature bath for controlling a circulating water jacket of a reaction kettle and the rotating speed of a high-pressure multiphase mixed transportation circulating pump are set, after the temperature in the reaction kettle is stable, an oil-gas-water mixture wax deposition cold finger experiment under dynamic high pressure is carried out, the rotating speed of a stirrer and the temperature of a refrigeration constant temperature tank connected with a cold finger are set according to different requirements, two groups of parallel experiments or comparison experiments under different temperature or shearing conditions can be simultaneously carried out, the macroscopic level of cold finger wax deposition and hydrate generation is monitored through a high-pressure visual window in the experiment process, fluid samples are continuously sampled in the experiment process, the wax crystal state and the hydrate generation condition are microscopically observed under a microscope, and meanwhile, medicines can be filled through a high-pressure online additive system in the experiment link so as to observe the influence on the wax deposition before and after the addition on the macroscopic and microscopic levels;

7) After the high-pressure oil-gas-water mixture wax deposition simulation experiment is finished, closing the high-pressure multiphase mixed transportation circulating pump; after the fluid is stable, opening an emptying valve to discharge the residual experimental gas, opening the reaction kettle, taking out the cold finger, and researching the properties of the sediment deposited on the surface of the cold finger, such as mass, thickness, wax content, carbon number distribution and the like;

8) And discharging liquid in the experiment system to protect the experiment device.

Compared with the prior art, the invention has the beneficial effects that:

1) The device has the advantages of small floor area, less gas-liquid consumption, capability of realizing various simulation functions, relatively simple operation procedure and capability of coping with various complex field working environments.

2) The invention can carry out two groups of cold finger experiments under high pressure, the two groups of experiments can be parallel experiments and can also be contrast experiments, the experiment times and the consumption of experiment oil gas are reduced, and the experiment efficiency is improved.

Drawings

Fig. 1 is a schematic structural diagram of a high-pressure oil-gas-water mixture wax deposition simulation experiment device.

Fig. 2 is a schematic view of two cold finger axes and the position of a high pressure visible window.

In the figure, the position of the first and second end faces, 1-high pressure reactor, 2-high pressure gas cylinder, 3-gas source valve, 4-pressure gauge, 5-pressure reducing valve, 6-pressure gauge, 7-first gas inlet valve, 8-gas flowmeter, 9-second gas inlet valve, 10-vacuum valve, 11-vacuum pump emptying valve, 12-vacuum pump, 13-emergency relief valve, 14-first injection/drainage pipe, 15-second injection/drainage pipe, 16-first injection/drainage valve, 17-second injection/drainage valve, 18-liquid tank, 19-third injection/drainage valve, 20-fourth injection/drainage valve, 21-high pressure oil-water injection pump, 22-fifth injection/drainage valve, 23-fluid loop valve, 24-high pressure multiphase mixed infusion circulating pump, 25-multiphase flowmeter 26-a first liquid inlet valve, 27-a second liquid inlet valve, 28-a first liquid inlet pipe, 29-a second liquid inlet pipe, 30-a first high-pressure visual window, 31-a second high-pressure visual window, 32-a first refrigeration thermostatic bath, 33-a second refrigeration thermostatic bath, 34-a first temperature sensor, 35-a second temperature sensor, 36-a pressure-resistant stainless steel clapboard, 37-a first additive valve, 38-a high-pressure additive device, 39-a second additive valve, 40-a third additive valve, 41-a first additive pipe, 42-a second additive pipe, 43-an emptying valve, 44-a first stirring motor, 45-a second stirring motor, 46= a first stirring rod, 47-a second stirring rod, 48-a first stirring paddle, 49-a second stirring paddle, 50-a polytetrafluoroethylene insulator, 51-a polytetrafluoroethylene insulator, 52-a polytetrafluoroethylene insulator, 53-a polytetrafluoroethylene insulator, 54-a first cold finger, 55-a second cold finger, 56-a cooling liquid circulation cavity, 57-a cooling liquid circulation cavity, 58-a first pressure sensor, 59-a second pressure sensor, 60-a third temperature sensor, 61-a fourth temperature sensor, 62-a circulation water jacket, 63-a heat preservation layer, 64-a high-pressure kettle cover, 65-a constant temperature bath, 66-a fifth temperature sensor, 67-a first sampling pipe, 68-a second sampling pipe, 69-a first sampling valve, 70-a second sampling valve, 71-a sampling device, 72-a third sampling valve, 73-a high-pressure microscopic clamp, 74-a cooling liquid circulation water channel, 75-a fourth sampling valve, 76-a third refrigeration constant temperature bath, 77-a sixth temperature sensor and 78-a gas pipeline valve.

Detailed Description

The invention is further described below with reference to the figures and examples.

A high-pressure oil-gas-water mixture wax deposition simulation experiment device comprises a high-pressure reaction kettle 1, wherein a high-pressure resistant stainless steel plate 36 is arranged in the middle of the high-pressure reaction kettle 1 to divide the interior of the reaction kettle into two fast relatively independent areas, the cross section of the high-pressure resistant stainless steel plate is overlapped with the inner diameter of the reaction kettle, the uppermost end and the lowermost end in the reaction kettle are respectively provided with an area with the height of 2cm and are not separated by a steel plate, fluid can freely circulate, the high-pressure reaction kettle 1 is further provided with a first high-pressure visual window 30 and a second high-pressure visual window 31, the two relatively independent areas separated by the high-pressure stainless steel plate 36 are respectively provided with a cold finger 52 and a cold finger 53 which are respectively connected with a first refrigeration thermostatic bath 32 and a second refrigeration thermostatic bath 33, the first refrigeration thermostatic bath 32 is used for controlling the temperature of the first cold finger 52, the second refrigeration thermostatic bath 33 is used for controlling the temperature of the second cold finger 53, first stirring rake 48 links to each other with first agitator motor 44 through first puddler 46, and second stirring rake 49 links to each other with second agitator motor 45 through second puddler 47, and agitator motor drive stirring rake rotates the cold finger and provides certain shear rate around the fluid, high-pressure oil gas water mixture wax deposit simulation experiment device still includes the outer fluid loop system of high-pressure reation kettle, and this system mainly comprises high-pressure heterogeneous defeated circulating pump 24 and heterogeneous flowmeter 25 of mixing for realize the extrinsic cycle of reation kettle inner oil gas water mixture, high-pressure oil gas water mixture wax deposit simulation experiment device still includes the online additive system and the sample and visual system of realization online additive and sample under high-pressure environment, high-pressure oil gas water mixture wax deposit simulation experiment device still includes gas-liquid injection system and vacuum generation system, as shown in fig. 1.

The invention mainly explores the wax deposition condition of oil-gas-water mixture in high pressure environment, wherein the range of high pressure is 0.1 MPa-16 MPa.

In this embodiment, the first cold finger 54 and the second cold finger 55 are both pressure-resistant double-layer cylinders with two closed ends, the cooling liquid circulation cavities 56 and 57 are arranged between the two cylinders, the cooling liquid circulation cavity 56 is connected with the first refrigeration constant temperature bath 32, the cooling liquid circulation cavity 57 is connected with the second refrigeration constant temperature bath 33, the first refrigeration constant temperature bath 32 and the second refrigeration constant temperature bath 33 achieve the purpose of controlling the wall temperature of the first cold finger 54 and the second cold finger 55 by controlling the temperature of the cooling liquid in the circulation cavities 56 and 57, the fluids in the first refrigeration constant temperature bath 32, the second refrigeration constant temperature bath 33 and the cooling liquid circulation cavities 56 and 57 are ethylene glycol aqueous solution with a certain proportion, the temperature control range is-10 ℃ to 100 ℃, the first cold finger 54 and the second cold finger 55 are both fixed at the upper end of the high-pressure reaction kettle 1, the axis thereof passes through the kettle body of the high-pressure reaction kettle 1 and is divided by the high-pressure resistant stainless steel plate 36 to form a two semicircular section core, the two axes are symmetrical about the cross section of the high-pressure stainless steel plate 36, as shown in fig. 2, the first cold finger 54 is overlapped with the axes of the first stirring rod 46 and the first stirring paddle 48, the second cold finger 55 is overlapped with the axes of the second stirring rod 47 and the second stirring paddle 49, the first stirring rod 46 is sleeved in the inner cylinder of the first cold finger 54, the second stirring rod 47 is sleeved in the inner cylinder of the second cold finger 55, the first stirring paddle 48 and the second stirring paddle 49 are both anchor type impellers, the horizontal section of the impeller is positioned under the cold finger, the vertical section is positioned outside the cold finger, and the lowest position of the impeller is higher than the lowest position of the high-pressure resistant stainless steel plate 36, so that the first stirring paddle 48 and the second stirring paddle 49 can relatively and independently provide uniform shearing disturbance for the first cold finger 54 and the second cold finger 55, the upper half part and the bottom part of the first cold finger 54 and the second cold finger 55 are respectively coated with a polytetrafluoroethylene insulator 50 and a polytetrafluoroethylene insulator 50, 51. 52 and 53, the heat transfer between the wall surface of the covered cold finger and the fluid in the kettle enables the solid-phase wax deposition to occur in a certain area of the lower half side wall surface of the appointed cold finger, avoids the influence on wax precipitation caused by the mutual communication of two relatively independent experiment areas on the upper part of the kettle body of the high-pressure reaction kettle 1, avoids the error caused by the difference of upper liquid level waves and the like, and is convenient for calculating the wax deposition rate of unit area after the experiment is finished.

In the embodiment, the side wall of the high-pressure reaction kettle contains a circulating water jacket 62, the circulating water jacket is connected with a constant temperature bath 65, the temperature in the circulating water jacket 62 can be controlled through the constant temperature bath 65, the temperature control range is normal temperature to 90 ℃, and the circulating water jacket can realize accurate control of the temperature in the kettle body of the high-pressure reaction kettle 1.

In this embodiment, the external fluid loop system of the high-pressure reactor is used for realizing external circulation of an oil-gas-water mixture in the reactor, the addition of the fluid loop system enables the fluid in the reactor body of the high-pressure reactor 1 to be closer to the flow in an actual pipeline, and the wax concentration reduction problem of the system caused by wax crystal deposition on the cold finger wall surface in the experimental process is offset by increasing the amount of wax-containing oil participating in the experiment. In the experimental process, fluid enters the high-pressure multiphase mixed transportation circulating pump 24 through the first liquid injection/discharge pipe 14 and the second liquid injection/discharge pipe 15, and is metered by the multiphase flowmeter 25 and then is injected into the two areas in the kettle body of the high-pressure reaction kettle 1 again through the first liquid inlet pipe 28 and the second liquid inlet pipe 29. In this embodiment, an online sampling and visualization system is used to acquire the experimental fluid and explore the solid phase deposition microtopography in a high pressure environment without terminating the experiment. The first sampling pipe 67 and the second sampling pipe 68 are connected in parallel, fluid near the first cold finger 54 and the second cold finger 55 can be respectively introduced into the sampling device 71 by controlling the opening and closing of the first sampling valve 69 and the second sampling valve 70, one end of the first sampling pipe 67 and one end of the second sampling pipe 68 are positioned in the high-pressure reaction kettle, the other end of the first sampling pipe 67 and the other end of the second sampling pipe 68 are connected with the first sampling valve 69 and the second sampling valve 70, and the sampling device 71 has a certain volume and can bear the pressure in the reaction kettle. The online sampling and visualization system also comprises a high-pressure microscopic clamp holder 73, the high-pressure microscopic clamp holder 73 is provided with three transparent visual glass window bodies, three windows are distributed in the clamp holder in an upper layer, a middle layer and a lower layer, the upper layer window and the lower layer window are fixed on a clamp holder cover plate and a bottom plate and are used for observing and transmitting light, the middle layer is a seam adjusting piston capable of moving up and down, the seam width of the seam adjusting piston is mainly used for adjusting an observation gap between the seam adjusting piston and the upper layer window, the minimum seam width can reach micron level, and the maximum width is 0.5mm; the high-pressure microscope holder 73 is placed under a polarizing microscope to observe the microscopic morphology of the sampled fluid; the high-pressure microscope holder 73 is also provided with a cooling liquid circulating water channel 74, the cooling liquid circulating water channel 74 is connected with a third refrigeration thermostatic bath 76, and the third refrigeration thermostatic bath 76 realizes the temperature control of the high-pressure microscope holder 73 by changing the temperature of the cooling liquid in the cooling liquid circulating water channel 74, so that the dynamic observation of the generated wax crystal structure can be realized under different temperature conditions.

In this embodiment, the online reagent adding system is used for online adding of the chemicals to the oil-gas-water mixture in the autoclave during the experiment, and the influence of the reagent on the deposits on the first cold finger 54 and the second cold finger 55 is macroscopically observed by means of the first high-pressure visible window 30 and the second high-pressure visible window 31 on the autoclave body of the autoclave 1, and the microscopic properties of the fluids before and after reagent adding are observed by means of the online sampling and visualization system. The medicine reaches the set pressure through the high-pressure dosing device 38 with the built-in micro-injection pump and is added into the fluid near the first cold finger 54 or the second cold finger 55 through the second dosing valve 39, the first dosing pipe 41 or the third dosing valve 40 and the second dosing pipe 42.

In this embodiment, the vacuum generation system is used for exhausting the gas in the high-pressure reaction kettle and the residual gas in the loop system before the experiment is carried out, and the gas tightness of the device is inspected to ensure the safety of the experiment. The vacuum generating system comprises a vacuum pump 12, a vacuum valve 10, a vacuum pump vent valve 11 and corresponding connecting lines.

In this embodiment, the gas-liquid injection system can be further subdivided into a gas injection system and a liquid injection system, and is used for providing the experimental fluid medium and the required high-pressure environment for the high-pressure reaction kettle 1 and the fluid loop system outside the kettle before the experiment. The wax-containing oil with certain water content is placed in the liquid tank 18, the third liquid injection/drainage valve 19 is positioned in a bypass pipeline of the high-pressure oil-water injection pump 21, whether the liquid in the liquid tank 18 passes through the high-pressure oil-water injection pump 21 or not can be selected by controlling the opening and closing of the third liquid injection/drainage valve 19 and the fourth liquid injection/drainage valve 20, the liquid flows to the kettle body of the high-pressure reaction kettle 1 and the fluid loop system outside the kettle after passing through the fifth liquid injection/drainage valve 22, the liquid is injected into the kettle body of the high-pressure reaction kettle 1 through the first liquid injection/drainage pipe 14 and the second liquid injection/drainage pipe 15, the first liquid injection/drainage pipe 14 is connected with the kettle body below the first cold finger 54, and the second liquid injection/drainage pipe 15 is connected with the kettle body below the second cold finger 55. High-pressure gas is provided by a high-pressure gas bottle 2, enters a high-pressure gas inlet pipeline connected with the kettle body of the high-pressure reaction kettle 1 through a gas source valve 3, a pressure reducing valve 5, a first gas inlet valve 7, a gas flowmeter 8 and a second gas inlet valve 9, and is positioned under the kettle body of the high-pressure reaction kettle 1 and coincided with the central axis of the high-pressure reaction kettle 1.

In the present embodiment, the first liquid injection/discharge pipe 14, the second liquid injection/discharge pipe 15, the first liquid injection/discharge valve 16, the second liquid injection/discharge valve 17, and the connection line are configured to be common to the liquid injection system and the off-tank fluid circuit system.

In this embodiment, the high-pressure air inlet pipeline is provided with an emergency relief valve 13, and an emptying valve 43 is arranged above the kettle body of the high-pressure reaction kettle 1 for releasing the system pressure and ensuring the safety of the experiment. After the experiment is completed, high pressure gas is released through the vent valve 43 and the liquid is discharged through the liquid injection system.

The following introduces a high-pressure oil-gas-water mixture wax deposition simulation method, which relies on the high-pressure oil-gas-water mixture wax deposition simulation experimental device described in this embodiment, and includes the following steps:

1) Starting a vacuum pump 12, vacuumizing the interior of the high-pressure reaction kettle 1 to-0.1MPa, keeping the pressure unchanged after 1h, indicating that the high-pressure reaction kettle 1 and a fluid loop system outside the kettle have no leakage, and then carrying out the next experiment;

2) The inspection device and all valves are opened, the constant temperature bath 65 is opened, and the temperature is set to 50 ℃;

3) Opening a fifth liquid injection/discharge valve 22 and a fourth liquid injection/discharge valve 20, closing a third liquid injection valve 19, enabling the negative pressure caused by vacuumizing the water-containing wax oil in the liquid tank 18 to be sucked into the high-pressure reaction kettle 1 and the fluid loop system outside the kettle, and opening a high-pressure oil-water injection pump 21 to pump the residual liquid when the liquid level in the liquid tank 18 is not changed any more;

4) After the liquid is injected, opening the high-pressure gas cylinder 2, opening the gas source valve 3, adjusting the pressure reducing valve 5 to a set pressure, injecting gas into the high-pressure reaction kettle 1, collecting the gas flow in real time by the gas flowmeter 8, closing the gas source valve 3 when the set pressure is reached, and stopping gas injection;

5) Simultaneously, the first stirring motor 44 and the second stirring motor 45 are started, and the stirring paddle is driven to fully mix oil, gas and water in the reaction kettle for 1 hour at the temperature of the circulating water jacket 62 being 50 ℃;

6) According to the experimental scheme, the temperature of a constant temperature bath 65 for controlling a circulating water jacket 62 of the reaction kettle is set, a high-pressure multiphase mixed transportation circulating pump 24 is opened, the rotating speed is adjusted, after the temperature in the reaction kettle is stable, a dynamic oil-gas-water mixture wax deposition cold finger experiment under high pressure is carried out, the rotating speeds of a first stirring motor 44 and a second stirring motor 45 and the temperatures of a first refrigeration constant temperature bath 32 and a second refrigeration constant temperature bath 33 are set according to different requirements, two groups of parallel experiments or comparison experiments under different temperatures or shearing conditions are simultaneously carried out, in the experiment process, the macro layer of cold finger wax deposition and hydrate generation conditions are monitored through a first high-pressure visual window 30 and a second high-pressure visual window 31, in the experiment process, a first sampling valve 69, a second sampling valve 70, a third sampling valve 72 and a fourth sampling valve 75 are controlled, two fluid samples are continuously sampled, the temperature of the third refrigeration constant temperature bath 76 is set, the wax crystal state is observed under a polarizing microscope through a high-pressure microscope through a high-microscopic clamping device 73, and simultaneously, in a microscopic wax adding device 38 is used for observing the micro wax deposition and micro wax addition in the high-pressure reaction kettle and the micro wax addition layer of the high-pressure reaction kettle;

7) After the high-pressure oil-gas-water mixture wax deposition simulation experiment is completed, the high-pressure multiphase mixed transportation circulating pump 24 is closed; after the fluid is stable, the emptying valve 43 is opened to discharge the residual experimental gas, the autoclave cover 64 is opened, the first cold finger 54 and the second cold finger 55 are taken out, and the properties of the deposit deposited on the surface of the cold finger, such as the mass, the thickness, the wax content, the carbon number distribution, and the like, are researched.

8) And opening a first liquid injection/drainage valve 16 and a second liquid injection/drainage valve 17 at the bottom of the kettle, opening a fifth liquid injection/drainage valve 22 and a third liquid injection valve 19, and closing a fourth liquid injection/drainage valve 20 to ensure that all the residual liquid flows back to a liquid tank 18 for subsequent treatment.

It should be understood that the above description is only exemplary of the invention, and is not intended to limit the scope of the invention, so that the replacement of equivalent elements or equivalent changes and modifications made in the present invention should be included within the scope of the present invention. In addition, the technical features, the technical schemes and the technical schemes can be freely combined and used.

Claims (10)

1. The utility model provides a high pressure oil gas water mixture wax deposit simulation experiment device which characterized in that: the utility model provides a high-pressure oil gas water mixture wax deposition simulation experimental apparatus, includes high-pressure batch autoclave (1), high-pressure batch autoclave (1) middle part has one to bear or endure high-pressure stainless steel board (36), first cold finger (52) and second cold finger (53) link to each other with first refrigeration constant temperature bath (32) and second refrigeration constant temperature bath (33) respectively, first refrigeration constant temperature bath (32) are used for controlling first cold finger (52) temperature, second refrigeration constant temperature bath (33) are used for controlling second cold finger (53) temperature, first stirring rake (48) link to each other with first agitator motor (44) through first puddler (46), second stirring rake (49) link to each other with second agitator motor (45) through second puddler (47), high-pressure oil gas water mixture wax deposition simulation experimental apparatus still includes high-pressure batch autoclave external fluid loop system, and this system mainly is defeated circulating pump (24) and heterogeneous circulation pump (25) constitute by high-pressure oil gas water mixture wax deposition simulation online simulation experiment apparatus and high-pressure oil gas water mixture wax deposition simulation system still include that the on-line sample system and the visual system of high-pressure oil gas water mixture wax deposition and high-water mixture still take place under the sample system, the high-pressure reaction batch autoclave system.

2. The high-pressure oil-gas-water mixture wax deposition simulation experiment device of claim 1, which is characterized in that: a high-pressure stainless steel plate (36) is arranged in the high-pressure reaction kettle (1), the high-pressure stainless steel plate (36) divides the interior of the high-pressure reaction kettle (1) into two relatively independent areas, the cross section of the area is superposed with the inner diameter of the reaction kettle, the areas with the height of 2cm are respectively arranged at the uppermost end and the lowermost end in the kettle and are not separated by the steel plate, and fluid can freely flow; the high-pressure reaction kettle (1) is provided with a first high-pressure visible window (30), a second high-pressure visible window (31), a first pressure sensor (58), a second pressure sensor (59), a third temperature sensor (60) and a fourth temperature sensor (61).

3. The high-pressure oil-gas-water mixture wax deposition simulation experiment device according to claim 1, characterized in that: the first cold finger (54) and the second cold finger (55) are completely the same and are of pressure-resistant double-layer cylinder structures with two closed ends, cooling liquid circulation cavities (56) and (57) are arranged between the two layers of cylinders, the first refrigeration thermostatic bath (32) is connected with the cooling liquid circulation cavity (56) and controls the temperature of cooling liquid, and the second refrigeration thermostatic bath (33) is connected with the cooling liquid circulation cavity (57) and controls the temperature of the cooling liquid, so that the aim of controlling the wall surface temperature of the first cold finger (54) and the second cold finger (55) is fulfilled; the first cold finger (54) and the second cold finger (55) are fixed at the upper end of the high-pressure reaction kettle (1), the axes of the first cold finger and the second cold finger pass through the centroids of two semicircular sections separated by the high-pressure resistant stainless steel plate (36) of the high-pressure reaction kettle (1), the two axes are symmetrical about the section of the high-pressure resistant stainless steel plate (36), the first stirring rod (46) is sleeved in the inner cylinder of the first cold finger (54), and the second stirring rod (47) is sleeved in the inner cylinder of the second cold finger (55); the first stirring paddle (48) and the second stirring paddle (49) adopt anchor type impellers, the horizontal sections of the anchor type impellers are positioned right below the cold finger, the vertical sections of the anchor type impellers are positioned outside the cold finger, and the lowest position of each impeller is higher than the lowest position of the high-pressure resistant stainless steel plate (36); the upper half part and the bottom part of the first cold finger (54) and the second cold finger (55) are respectively coated with polytetrafluoroethylene insulators (50), (51), (52) and (53).

4. The high-pressure oil-gas-water mixture wax deposition simulation experiment device of claim 1, which is characterized in that: the high-pressure reaction kettle external fluid loop system comprises a first liquid injection/discharge pipe (14) and a second liquid injection/discharge pipe (15) which are positioned at the bottom of a kettle and enable fluid to flow out, a multiphase mixed transportation circulating pump (24) for providing circulating power, a multiphase flowmeter (25) for metering, a first liquid inlet pipe (28) and a second liquid inlet pipe (29) which enable the fluid to return to the high-pressure reaction kettle (1) again, a first liquid injection/discharge valve (16), a second liquid injection/discharge valve (17), a fluid loop valve (23), a first liquid inlet valve (26) and a second liquid inlet valve (27) which are controlled in an auxiliary mode, and high-pressure pipelines for connecting all components.

5. The high-pressure oil-gas-water mixture wax deposition simulation experiment device of claim 1, which is characterized in that: the online sampling and visualization system comprises a first sampling pipe (67) and a second sampling pipe (68) which are connected in parallel, a first sampling valve (69) and a second sampling valve (70) which are used for discharging fluid out of the high-pressure reaction kettle (1) through controlling opening and closing, a sampling device (71) which has a certain volume and can bear the pressure inside the reaction kettle, a high-pressure microscopic holder (73) which is arranged under a polarizing microscope, a third refrigeration thermostatic bath (76) which is connected with a cooling fluid circulating water channel (74) in the high-pressure microscopic holder (73) to control the temperature of the high-pressure microscopic holder (73), a third sampling valve (72) and a fourth sampling valve (75) which are controlled in an auxiliary manner, a sixth temperature sensor (77) for realizing temperature monitoring, and pipelines for connecting all components; one end of a first sampling pipe (67) is positioned near a first cold finger (54) in the high-pressure reaction kettle (1), the other end of the first sampling pipe is connected with a first sampling valve (69), one end of a second sampling pipe (68) is positioned near a second cold finger (55) in the high-pressure reaction kettle (1), and the other end of the second sampling pipe is connected with a first sampling valve (70).

6. The high-pressure oil-gas-water mixture wax deposition simulation experiment device according to claim 1, characterized in that: the online dosing system comprises a high-pressure dosing device (38) for boosting the pressure of the medicine to a specified pressure, a first dosing pipe (41), a second dosing pipe (42), a first dosing valve (41), a second dosing valve (39) and a third dosing valve (40) which are in auxiliary control, and high-pressure pipelines for connecting all components; one end of a first additive pipe (41) extends into the high-pressure reaction kettle (1) to be close to a first cold finger (54), the other end of the first additive pipe is connected with a second additive valve (39), one end of a second additive pipe (42) extends into the high-pressure reaction kettle (1) to be close to a second cold finger (55), the other end of the second additive pipe is connected with a third additive valve (40), and medicines boosted by a high-pressure additive device (38) with a built-in micro-injection pump can be added into fluid at a corresponding position in the high-pressure reaction kettle (1) by controlling the opening and closing of the second additive valve (39) and the third additive valve (40).

7. The high-pressure oil-gas-water mixture wax deposition simulation experiment device of claim 1, which is characterized in that: the vacuum generating system is connected in parallel with the air inlet pipeline and comprises a vacuum pump (12), a vacuum valve (10), a vacuum pump emptying valve (11) and a corresponding connecting high-pressure pipeline.

8. The high-pressure oil-gas-water mixture wax deposition simulation experiment device of claim 1, which is characterized in that: the liquid injection system comprises a liquid tank (18) for providing liquid, a high-pressure oil-water injection pump (21) for pumping the liquid into the high-pressure reaction kettle (1) and a loop, a first liquid injection/drainage pipe (14) and a second liquid injection/drainage pipe (15) for injecting the liquid into the high-pressure reaction kettle (1), a first liquid injection/drainage valve (16), a second liquid injection/drainage valve (17), a third liquid injection/drainage valve (19), a fourth liquid injection/drainage valve (20) and a fifth liquid injection/drainage valve (22) for assisting control, and a corresponding connecting high-pressure pipeline; the third injection/drainage valve (19) is positioned on a bypass line of the high-pressure oil-water injection pump (21), and whether the liquid passes through the high-pressure oil-water injection pump (21) or not can be selected by controlling the opening and closing of the third injection/drainage valve (19) and the fourth injection/drainage valve (20).

9. The high-pressure oil-gas-water mixture wax deposition simulation experiment device according to claim 1, characterized in that: the gas injection system comprises a high-pressure gas cylinder (2) for providing high-pressure gas, a gas source valve (3), a pressure reducing valve (5), a first gas inlet valve (7), a gas flow meter (8), a second gas inlet valve (9), a gas pipeline valve (10) and a corresponding connecting high-pressure pipeline.

10. The high-pressure oil-gas-water mixture wax deposition simulation experiment device according to claim 1, characterized in that: a first liquid injection/discharge pipe (14), a second liquid injection/discharge pipe (15), a first liquid injection/discharge valve (16), a second liquid injection/discharge valve (17) and a structure which is connected with a high-pressure pipeline and is shared by the liquid injection system and the fluid loop system outside the kettle.

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