CN112816517B - Wax precipitation experiment system and wax precipitation cylinder - Google Patents
Wax precipitation experiment system and wax precipitation cylinder Download PDFInfo
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- CN112816517B CN112816517B CN201911126546.0A CN201911126546A CN112816517B CN 112816517 B CN112816517 B CN 112816517B CN 201911126546 A CN201911126546 A CN 201911126546A CN 112816517 B CN112816517 B CN 112816517B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/02—Investigating or analyzing materials by the use of thermal means by investigating changes of state or changes of phase; by investigating sintering
- G01N25/12—Investigating or analyzing materials by the use of thermal means by investigating changes of state or changes of phase; by investigating sintering of critical point; of other phase change
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/04—Investigating sedimentation of particle suspensions
Abstract
The utility model discloses a wax precipitation experimental system and wax precipitation section of thick bamboo belongs to the oil transportation field. The wax deposition barrel comprises a barrel body with at least one closed end and a coiled pipe used for exchanging heat with the barrel body, wherein the coiled pipe is positioned in the barrel body and extends spirally along the axial direction of the barrel body. Through setting up a barrel, set up in the barrel and be used for carrying out the coiled pipe of heat exchange with the barrel, the axial spiral of coiled pipe edge barrel extends to can let in the lower coolant liquid of temperature to the coiled pipe, the coolant liquid carries out the heat exchange at the in-process that the coiled pipe flows and barrel, can take away the heat, makes the temperature reduction of barrel. When carrying out the wax deposition experiment like this, can arrange the crude oil in with barrel confined one end in, avoid crude oil to get into inside the barrel, let in the coolant liquid in the coiled pipe, make the barrel keep lower temperature, impel the wax deposit in crude oil on the outer wall of a wax deposition section of thick bamboo, the wax deposit process of simulation crude oil in oil pipeline is convenient for study the wax deposit law of crude oil.
Description
Technical Field
The disclosure relates to the field of petroleum transportation, in particular to a paraffin precipitation experiment system and a paraffin precipitation cylinder.
Background
The pipeline transportation is a crude oil transportation mode which is generally adopted at present, and has the advantages of small occupied area, large transportation capacity, convenience for centralized management and control and the like.
During the process of crude oil transportation, the phenomenon of wax deposition of pipelines often occurs, and when the temperature of the pipe wall is lower than the wax precipitation point of the crude oil, the paraffin in the crude oil is crystallized and separated out and deposited on the pipe wall. The effective flow area of the pipeline is reduced due to wax deposition of the pipeline, the conveying pressure is increased, the conveying capacity is reduced, and the pipeline can be blocked in serious cases. Therefore, it is particularly important to study and analyze the wax deposition law of crude oil for pipeline transportation.
Disclosure of Invention
The embodiment of the disclosure provides a wax deposition experiment system and a wax deposition cylinder, which can simulate the wax deposition process of crude oil and facilitate the research of the wax deposition rule of the crude oil. The technical scheme is as follows:
in a first aspect, an embodiment of the present disclosure provides a paraffin precipitation experiment system, which includes a support, a sample cylinder, a torque sensor, a driving device, and a paraffin precipitation cylinder, where the sample cylinder and the driving device are both installed on the support, the driving device is configured to drive the sample cylinder to rotate, one end of the paraffin precipitation cylinder is connected to the support through the torque sensor, the other end of the paraffin precipitation cylinder is located in the sample cylinder, the other end of the paraffin precipitation cylinder is closed, the paraffin precipitation cylinder includes a cylinder body with at least one closed end, and a coiled pipe for exchanging heat with the cylinder body, and the coiled pipe is located in the cylinder body and extends spirally along an axial direction of the cylinder body.
Optionally, the serpentine has a liquid inlet end and a liquid outlet end, the pitch of the serpentine decreases from the liquid inlet end to the liquid outlet end; or
The wax deposition barrel comprises two coiled pipes, wherein the two coiled pipes are interwoven into a double-spiral shape, each coiled pipe is provided with a liquid inlet end and a liquid outlet end, the liquid inlet end of one of the coiled pipes is positioned at the liquid outlet end of the other one of the coiled pipes, and the liquid outlet end of the one coiled pipe is positioned at the liquid inlet end of the other one of the coiled pipes.
Optionally, the wax deposition cylinder further comprises a liquid inlet pipe extending from the inside of the cylinder to the outside and a liquid outlet pipe extending from the inside of the cylinder to the outside, the liquid inlet end of the coiled pipe is communicated with the part of the liquid inlet pipe located in the cylinder, and the liquid outlet end of the coiled pipe is communicated with the part of the liquid outlet pipe located in the cylinder.
Optionally, a heat-insulating sleeve is sleeved on the part, located outside the cylinder, of the liquid inlet pipe.
Optionally, the cross-sectional shape of the serpentine pipe in the axial direction of the cylinder has at least one straight edge, and the outer surface corresponding to the straight edge is attached to the inner wall of the cylinder.
Optionally, the coiled pipe is bonded to the inner wall of the cylinder through a heat-conducting glue.
Optionally, the wax precipitation experiment system further comprises a thermostatic device, and the sample cylinder is located in the thermostatic device.
In a second aspect, an embodiment of the present disclosure further provides a waxing drum, which includes a drum body with at least one closed end, and a serpentine tube for exchanging heat with the drum body, where the serpentine tube is located in the drum body and extends spirally along an axial direction of the drum body.
Optionally, the serpentine tube has a liquid inlet end and a liquid outlet end, the pitch of the serpentine tube gradually decreases from the liquid inlet end to the liquid outlet end; or
The wax deposition barrel comprises two coiled pipes, wherein the two coiled pipes are interwoven into a double-spiral shape, each coiled pipe is provided with a liquid inlet end and a liquid outlet end, the liquid inlet end of one of the coiled pipes is positioned at the liquid outlet end of the other one of the coiled pipes, and the liquid outlet end of the one coiled pipe is positioned at the liquid inlet end of the other one of the coiled pipes.
Optionally, the wax deposition cylinder further comprises a liquid inlet pipe extending from the inside of the cylinder to the outside and a liquid outlet pipe extending from the inside of the cylinder to the outside, the liquid inlet end of the coiled pipe is communicated with the part of the liquid inlet pipe located in the cylinder, and the liquid outlet end of the coiled pipe is communicated with the part of the liquid outlet pipe located in the cylinder.
Optionally, a heat-insulating sleeve is sleeved on the part, located outside the cylinder, of the liquid inlet pipe.
Optionally, the cross-sectional shape of the serpentine pipe in the axial direction of the cylinder has at least one straight edge, and the outer surface corresponding to the straight edge is attached to the inner wall of the cylinder.
Optionally, the coiled pipe is bonded to the inner wall of the cylinder through a heat-conducting glue.
The beneficial effects brought by the technical scheme provided by the embodiment of the disclosure at least comprise:
through setting up a barrel, set up in the barrel and be used for carrying out the coiled pipe of heat exchange with the barrel, the axial spiral of coiled pipe edge barrel extends to can let in the lower coolant liquid of temperature to the coiled pipe, the coolant liquid carries out the heat exchange at the in-process that the coiled pipe flows and barrel, can take away the heat, makes the temperature reduction of barrel. When carrying out the wax deposition experiment like this, can arrange the crude oil in with barrel confined one end in, avoid crude oil to get into inside the barrel, let in the coolant liquid in the coiled pipe, make the barrel keep lower temperature, impel the wax deposit in crude oil on the outer wall of a wax deposition section of thick bamboo, the wax deposit process of simulation crude oil in oil pipeline is convenient for study the wax deposit law of crude oil.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a wax deposition cartridge provided in an embodiment of the present disclosure;
FIG. 2 is a schematic cross-sectional view of a serpentine tube provided by embodiments of the present disclosure;
FIG. 3 is a schematic partial structure diagram of another wax deposition cartridge provided in the embodiments of the present disclosure;
FIG. 4 is a schematic structural diagram of another wax precipitation cartridge provided by the embodiment of the disclosure;
FIG. 5 is a schematic structural diagram of another wax deposition cartridge provided by the embodiments of the present disclosure;
fig. 6 is a schematic structural diagram of a wax precipitation experiment system provided in an embodiment of the present disclosure.
Detailed Description
To make the objects, technical solutions and advantages of the present disclosure more apparent, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a wax precipitation barrel provided in an embodiment of the disclosure. As shown in fig. 1, the waxing tube includes a barrel 10 having at least one end closed and a serpentine tube 20 for heat exchange with the barrel 10. The serpentine tube 20 is located inside the cylinder 10 and spirally extends in the axial direction of the cylinder 10.
Through setting up a barrel, set up in the barrel and be used for carrying out the coiled pipe of heat exchange with the barrel, the axial spiral of coiled pipe edge barrel extends to can let in the lower coolant liquid of temperature to the coiled pipe, the coolant liquid carries out the heat exchange at the in-process that the coiled pipe flows and barrel, can take away the heat, makes the temperature reduction of barrel. When wax deposition experiments are carried out, one end of the cylinder body, which is sealed, can be placed in crude oil, the crude oil is prevented from entering the cylinder body, cooling liquid is introduced into the serpentine pipe, the temperature of the cylinder body is kept low, wax in the crude oil is promoted to be deposited on the outer wall of the wax deposition cylinder, the wax deposition process of the crude oil in an oil pipeline is simulated, and the wax deposition rule of the crude oil is convenient to research.
As shown in FIG. 1, the waxing drum may further include an inlet pipe 30 extending from the inside to the outside of the drum body 10 and an outlet pipe 40 extending from the inside to the outside of the drum body 10. The inlet end 20a of the coiled pipe 20 is communicated with the part of the inlet pipe 30 positioned in the cylinder 10, and the outlet end 20b of the coiled pipe 20 is communicated with the part of the outlet pipe 40 positioned in the cylinder 10. Illustratively, one end of the liquid inlet pipe 30 and one end of the liquid outlet pipe 40 are both located outside the cylinder 10, the other end of the liquid inlet pipe 30 is communicated with the liquid inlet end 20a of the serpentine pipe 20, and the other end of the liquid outlet pipe 40 is communicated with the liquid outlet end 20b of the serpentine pipe 20. By providing the liquid inlet pipe 30 and the liquid outlet pipe 40, the coolant can be circulated in the serpentine pipe 20 conveniently.
The end of the liquid inlet pipe 30 located outside the cylinder 10 and the end of the liquid outlet pipe 40 located outside the cylinder 10 may be located at the same end of the cylinder 10. For example, as shown in FIG. 1, both the inlet and outlet tubes 30, 40 extend from the upper end of the cartridge 10 to the exterior of the cartridge 10. During the experiment, the barrel 10 needs to be immersed in crude oil, so that wax is deposited on the outer wall of the barrel 10, and the liquid inlet pipe 30 and the liquid outlet pipe 40 both extend to the outside of the barrel 10 from the same end of the barrel 10, so that the other end of the barrel 10 can be immersed in the crude oil, the contact between the liquid inlet pipe 30 and the liquid outlet pipe 40 and the crude oil is avoided, and the wax in the crude oil is prevented from being deposited on the liquid inlet pipe 30 and the liquid outlet pipe 40.
At least the lower end of the cylinder 10 is closed, the lower end is opposite to the upper end of the cylinder 10, and one end of the liquid inlet pipe 30 outside the cylinder 10 and one end of the liquid outlet pipe 40 outside the cylinder 10 are both positioned at the upper end of the cylinder 10. This is to prevent the crude oil from entering the inside of the cylinder 10 when the cylinder 10 is immersed in the crude oil. The upper end of the cylinder 10 is open in fig. 1, and in other possible implementations, the upper end of the cylinder 10 may be closed.
As shown in fig. 1, the liquid inlet pipe 30 includes a first straight pipe 31 perpendicular to the axis of the cylinder 10, and the first straight pipe 31 penetrates the wall of the cylinder 10. The outlet pipe 40 comprises a first vertical pipe 41 parallel to the axis of the cylinder 10 and a second straight pipe 42 perpendicular to the axis of the cylinder 10, wherein one end of the first vertical pipe 41 is connected with the outlet end 20b of the coiled pipe 20, and the other end of the first vertical pipe 41 is connected with the second straight pipe 42.
Optionally, the portion of the liquid inlet pipe 30 outside the cylinder 10 may be further sleeved with a heat insulation sleeve 50. The temperature of the cooling liquid introduced into the liquid inlet pipe 30 is usually lower than the room temperature, and the heat exchange speed between the liquid inlet pipe 30 and the environment can be reduced through the heat-insulating sleeve 50, so that the phenomenon that the cooling liquid has large temperature rise before entering the coiled pipe 20 and the cooling effect on the cylinder 10 is influenced is avoided.
The heat-insulating sleeve 50 may be made of a material having a good heat-insulating effect. Such as cotton, foam, aerogel blanket, glass wool, and the like.
Fig. 2 is a schematic cross-sectional view of a serpentine tube provided by an embodiment of the present disclosure. As shown in fig. 2, the cross-sectional shape of the serpentine tube 20 in the axial direction of the cylinder 10 has at least one straight edge 201, and the outer surface corresponding to the straight edge 201 is attached to the inner wall of the cylinder 10. The cross-sectional figure here refers to the two-dimensional figure presented by the cross-section. For example, the serpentine tube 20 shown in FIG. 2 has a semi-circular cross-sectional configuration. The semicircular section is provided with a straight edge and an arc edge, the outer surface corresponding to the straight edge 201 is attached to the inner wall of the cylinder body 10, the contact area between the coiled pipe 20 and the inner wall of the cylinder body 10 can be increased, the temperature of different areas on the surface of the cylinder body 10 is more uniform, and wax can be deposited on the outer wall of the cylinder body 10 more uniformly.
In other possible implementations of the present disclosure, the cross-sectional profile of the serpentine tube 20 may also be other shapes, such as rectangular, triangular, semi-elliptical, etc.
Alternatively, the serpentine tube 20 and the inner wall of the cylinder 10 may be bonded by a thermally conductive adhesive. The heat-conducting glue can improve the heat exchange efficiency between the coiled pipe 20 and the cylinder 10, so that heat can be more quickly taken away by the cooling liquid in the coiled pipe 20.
Fig. 3 is a partial structural schematic view of another wax precipitation barrel provided by the embodiment of the disclosure. As shown in fig. 3, the serpentine tube 20 of the waxing drum has a liquid inlet end 20a and a liquid outlet end 20b, and the pitch of the serpentine tube 20 is gradually reduced from the liquid inlet end 20a to the liquid outlet end 20 b. In the experimental process, the temperature of the cooling liquid injected into the serpentine tube 20 is lower than the wax precipitation point of the crude oil, the temperature difference between the cooling liquid and the cylinder 10 is the largest when the cooling liquid just enters the serpentine tube 20, so the heat exchange speed is the fastest, the cooling effect on the cylinder 10 is better, the temperature of the cooling liquid is gradually increased along with the increase of the flowing distance of the cooling liquid, the temperature difference between the cooling liquid and the cylinder 10 is gradually reduced, the heat exchange speed is gradually reduced, and the cooling effect on the cylinder 10 is poor. The pitch of the serpentine tube 20 is set to be gradually reduced from the liquid inlet end 20a to the liquid outlet end 20b, so that the moving speed of the cooling liquid along the axial direction of the cylinder 10 is gradually reduced, and the contact area between the cylinder 10 and the serpentine tube 20 per unit length is gradually reduced in the axial direction of the cylinder 10, so that the area of the cylinder 10 far away from the liquid inlet end 20a of the serpentine tube 20 can have larger area and time to exchange heat with the serpentine tube 20, the temperature of different areas on the surface of the cylinder 10 is more uniform, and the uniform deposition of wax on all parts of the surface of the cylinder 10 is facilitated.
The pitch variation of the serpentine tubes 20 per unit length in the axial direction of the cylinder 10 can be determined through experiments so that different regions on the cylinder 10 can be maintained at the same temperature under certain experimental conditions. The experimental conditions may include at least an initial temperature of the cooling water, a temperature of the crude oil, and a flow rate of the cooling water.
Alternatively, the ratio of the pitch t of the serpentine tubes 20 to the tube diameter of the serpentine tubes 20 may be 2 to 10. The pipe diameter here refers to the inner diameter. The ratio is set to be 2-10, so that the process difficulty and the cooling effect can be considered. If the ratio of the pitch t of the serpentine tube 20 to the diameter of the serpentine tube 20 is less than 2, the difficulty in processing the serpentine tube 20 may be significantly increased, and if the ratio of the pitch t of the serpentine tube 20 to the diameter of the serpentine tube 20 is greater than 10, the contact area between the serpentine tube 20 and the inner wall of the cylinder 10 is small, and the serpentine tube 20 may not provide a good cooling effect for the cylinder 10.
Fig. 4 is a schematic structural diagram of another wax precipitation cartridge provided in the embodiment of the present disclosure. As shown in fig. 4, the waxing drum may comprise two serpentine tubes 20. The two serpentine tubes 20 are interwoven into a double helix, the serpentine tubes 20 have a liquid inlet end 20a and a liquid outlet end 20b, the liquid inlet end 20a of one of the two serpentine tubes 20 is located at the liquid outlet end 20b of the other of the two serpentine tubes 20, and the liquid outlet end 20b of one of the serpentine tubes 20 is located at the liquid inlet end 20a of the other serpentine tube 20. In the experiment, since the inlet end 20a and the outlet end 20b of the two serpentine tubes 20 are opposite, the flow directions of the cooling liquid in the two serpentine tubes 20 are also opposite. For example, a coil 20 having a liquid inlet end 20a at the upper end of the cylinder 10 and a liquid outlet end 20b at the lower end of the cylinder 10, the upper end of the coil 20 is at a lower temperature and the lower end is at a higher temperature when the cooling liquid flows in the coil 20. The inlet end 20a of the other coil pipe 20 is positioned at the lower end of the cylinder 10, and the outlet end 20b is positioned at the upper end of the cylinder 10. When the cooling liquid flows in the serpentine tube 20, the temperature of the lower end of the serpentine tube 20 is low and the temperature of the upper end is high. By arranging the two serpentine tubes 20 and interweaving the two serpentine tubes into a double helix, the temperature distribution on the surface of the cylinder 10 can be more uniform under the superposition effect of the two serpentine tubes 20, which is beneficial to the uniform deposition of wax on the surface of the cylinder 10.
For the wax-forming cylinder shown in fig. 4, the pitch of the two coils 20 may be fixed or gradually decreased from the inlet end 20a to the outlet end 20b as shown in fig. 3, so as to keep the temperature of each region of the surface of the cylinder 10 equal as much as possible.
The pitch of the two serpentine tubes 20 may be the same. For example, the pitch of the two serpentine tubes 20 shown in fig. 4 is the same. In other possible implementations, the pitch of the two serpentine tubes 20 may also be different. The pitch of the two serpentine tubes 20 can be in a multiple relationship, for example, one serpentine tube 20 of the two serpentine tubes 20 can have twice the pitch of the other serpentine tube 20.
Fig. 5 is a schematic structural diagram of another wax precipitation cartridge provided in the embodiment of the present disclosure. The waxing drum may also include an inlet pipe 30 extending from the inside to the outside of the drum 10 and an outlet pipe 40 extending from the inside to the outside of the drum 10. As shown in fig. 5, the liquid inlet pipe 30 of the wax deposition pipe comprises a first third fork 32 and a second vertical pipe 33 parallel to the axis of the barrel 10, wherein a first end of the first third fork 32 is located outside the barrel 10, a second end of the first third fork 32 is communicated with the liquid inlet end 20a of one serpentine pipe 20, a third end of the first third fork 32 is communicated with one end of the second vertical pipe 33, and the other end of the second vertical pipe 33 is communicated with the liquid inlet end 20a of the other serpentine pipe 20. The liquid outlet pipe 40 of the waxing pipe comprises a second Y-shaped pipe 43 and a third vertical pipe 44 parallel to the axis of the barrel 10, wherein the first end of the second Y-shaped pipe 43 is positioned outside the barrel 10, the second end of the second Y-shaped pipe 43 is communicated with one end of the third vertical pipe 44, the other end of the third vertical pipe 44 is communicated with the liquid outlet end 20b of one coiled pipe 20, and the third end of the second Y-shaped pipe 43 is communicated with the liquid outlet end 20b of the other coiled pipe 20.
Illustratively, the cylinder 10 may be made of glass, stainless steel, or the like. The glass and the stainless steel both have good corrosion resistance, can avoid the corrosion of crude oil, the glass also has the characteristic of easy molding, the manufacture is convenient, and the stainless steel has better heat conductivity, and is beneficial to the heat exchange between the cylinder 10 and the coiled pipe 20 as well as between the cylinder and the crude oil.
The serpentine tube 20 may be made of glass, stainless steel, or the like. The serpentine tube 20 has a complicated shape, and glass is easy to mold and easy to manufacture, while stainless steel has good thermal conductivity, which is advantageous for heat exchange between the serpentine tube 20 and the cylinder 10.
Fig. 6 is a schematic structural diagram of a wax precipitation experiment system provided in an embodiment of the present disclosure. As shown in fig. 6, the waxing experiment system includes any one of the waxing cylinders 160 shown in fig. 1 to 5.
Through setting up a barrel, set up in the barrel and be used for carrying out the coiled pipe of heat exchange with the barrel, the axial spiral of coiled pipe edge barrel extends to can let in the lower coolant liquid of temperature to the coiled pipe, the coolant liquid carries out the heat exchange at the in-process that the coiled pipe flows and barrel, can take away the heat, makes the temperature reduction of barrel. When carrying out the wax deposition experiment like this, can arrange the crude oil in with barrel confined one end in, avoid crude oil to get into inside the barrel, let in the coolant liquid in the coiled pipe, make the barrel keep lower temperature, impel the wax deposit in crude oil on the outer wall of a wax deposition section of thick bamboo, the wax deposit process of simulation crude oil in oil pipeline is convenient for study the wax deposit law of crude oil.
The wax forming cylinder 160 is detachably connected to the holder 110 so that the wax forming cylinder 160 can be removed during an experiment to determine the amount of wax deposited on the wax forming cylinder 160.
As shown in fig. 6, the waxing experiment system may further include a bracket 110, a sample barrel 120, a torque sensor 130, and a driving device 140. The sample cylinder 120 and the driving device 140 are both mounted on the bracket 110, the driving device 140 is used for driving the sample cylinder 120 to rotate, one end of the wax deposition cylinder 160 is connected to the bracket 110 through the torque sensor 130, the other end of the wax deposition cylinder 160 is located in the sample cylinder 120, and the other end of the wax deposition cylinder 160 is closed. The driving device 140 drives the sample cylinder 120 to rotate, so that the crude oil can also rotate at a certain speed, the crude oil contacting with the wax deposition cylinder 160 is kept under a certain shearing strength, the shearing strength can be detected by the torque sensor 130, and the rotation speed of the sample cylinder 120 is adjusted based on the torque detected by the torque sensor 130, so that the shearing strength is kept in a required range. The wax can be more uniformly deposited on the surface of the wax deposition cylinder 160 during the rotation of the sample cylinder 120 driven by the driving device 140.
Alternatively, the driving device 140 may include a motor 141 and a belt 142, and the motor 141 is drivingly connected to the sample tube 120 through the belt 142, so as to rotate the sample tube 120.
In other possible implementations, the driving device 140 may also include a motor 141 and a gear, and the motor is in transmission connection with the sample cylinder 120 through the gear.
As shown in fig. 6, the waxing experiment system may further include a thermostat 150, and the sample cartridge 120 is located in the thermostat 150. The temperature of the crude oil in the sample cylinder 120 can be adjusted by the thermostat 150 to keep the crude oil at the temperature required by the experiment.
Illustratively, the thermostatic device 150 may include a thermostatic water bath 151, and the sample cartridge 120 is immersed in the thermostatic water bath 151. The sample cylinder 120 is subjected to a constant temperature water bath in a constant temperature water bath 151, so that the temperature of the crude oil in the sample cylinder 120 is kept constant.
As shown in fig. 6, the bottom of the thermostatic water tank 151 may have a through hole 151a, the bottom of the sample cylinder 120 may be coaxially connected to the transmission shaft 121, the transmission shaft 121 is located in the through hole 151a, and the transmission shaft 121 is in transmission connection with the driving device 140, so that the sample cylinder 120 may be driven to rotate by the transmission shaft 121, and the sample cylinder 120 may be supported by the transmission shaft 121. A dynamic seal may be provided in the through-hole 151a to avoid leakage at the through-hole 151 a.
The housing 170 may be further disposed on the frame 110, the driving device 140 and the thermostat device 150 may be disposed in the housing 170, and the housing 170 forms a box structure to protect the driving device 140 and the thermostat device 150.
The wax precipitation experiment system can further comprise a cooling device, wherein the cooling device is communicated with the liquid inlet end 20a and the liquid outlet end 20b of the coiled pipe 20, so that the cooling liquid flowing out of the coiled pipe 20 is cooled by the cooling device, and the cooled cooling liquid is fed back to the coiled pipe 20.
The experimental procedure of the wax precipitation experimental system shown in fig. 6 is briefly described as follows:
the crude oil is injected into the sample cylinder 120, and the crude oil in the sample cylinder 120 is maintained at a constant temperature by the thermostat 150. The cooling liquid is injected into the coil 20 and circulated through the coil 20 so that the outer wall of the wax deposition cylinder 160 has a temperature lower than the wax precipitation point of the crude oil in the sample cylinder 120. And the sample barrel 120 is driven to rotate by the driving means 140. After a period of time, the wax forming cylinder 160 is removed and weighed to determine the amount of wax on the wax forming cylinder 160.
The above description is only exemplary of the present disclosure and is not intended to limit the present disclosure, so that any modification, equivalent replacement, or improvement made within the spirit and principle of the present disclosure should be included in the scope of the present disclosure.
Claims (9)
1. The paraffin precipitation experiment system is characterized by comprising a bracket (110), a sample cylinder (120), a torque sensor (130), a driving device (140) and a paraffin precipitation cylinder (160), wherein the sample cylinder (120) and the driving device (140) are both installed on the bracket (110), the driving device (140) is used for driving the sample cylinder (120) to rotate, one end of the paraffin precipitation cylinder (160) is connected to the bracket (110) through the torque sensor (130), the other end of the paraffin precipitation cylinder (160) is located in the sample cylinder (120), and the other end of the paraffin precipitation cylinder (160) is closed, the wax deposition cylinder (160) comprises a cylinder body (10) with at least one closed end, two coiled pipes (20) used for heat exchange with the cylinder body (10), a liquid inlet pipe (30) extending to the outside from the inside of the cylinder body (10) and a liquid outlet pipe (40) extending to the outside from the inside of the cylinder body (10), wherein the coiled pipes (20) are positioned in the cylinder body (10) and extend along the axial spiral of the cylinder body (10), the two coiled pipes (20) are mutually interwoven into a double spiral shape, the two coiled pipes (20) are respectively provided with a liquid inlet end (20 a) and a liquid outlet end (20 b), and the liquid inlet end (20 a) of one coiled pipe (20) in the two coiled pipes (20) is positioned in the two other coiled pipes (20) The liquid outlet end (20 b) of the coiled pipe (20), and the liquid outlet end (20 b) of one coiled pipe (20) is positioned at the liquid inlet end (20 a) of the other coiled pipe (20);
the liquid inlet pipe (30) comprises a first Y-shaped pipe (32) and a second vertical pipe (33) parallel to the axis of the barrel body (10), the first end of the first Y-shaped pipe (32) is positioned outside the barrel body (10), the second end of the first Y-shaped pipe (32) is communicated with the liquid inlet end (20 a) of the coiled pipe (20), the third end of the first Y-shaped pipe (32) is communicated with one end of the second vertical pipe (33), the other end of the second vertical pipe (33) is communicated with the liquid inlet end (20 a) of the coiled pipe (20),
the liquid outlet pipe (40) comprises a second Y-shaped pipe (43) and a third vertical pipe (44) parallel to the axis of the barrel body (10), the first end of the second Y-shaped pipe (43) is positioned outside the barrel body (10), the second end of the second Y-shaped pipe (43) is communicated with one end of the third vertical pipe (44), the other end of the third vertical pipe (44) is communicated with the liquid outlet end (20 b) of one of the coiled pipes (20), and the third end of the second Y-shaped pipe (43) is communicated with the liquid outlet end (20 b) of the other coiled pipe (20).
2. The wax precipitation experiment system according to claim 1, wherein the part of the liquid inlet pipe (30) located outside the cylinder (10) is sleeved with a heat insulation sleeve (50).
3. The wax precipitation experiment system according to claim 1 or 2, wherein the cross-sectional pattern of the serpentine pipe (20) in the axial direction of the cylinder (10) has at least one straight edge (201), and the outer surface corresponding to the straight edge (201) is attached to the inner wall of the cylinder (10).
4. The waxing experiment system according to claim 1 or 2, wherein the serpentine tube (20) is bonded to the inner wall of the barrel (10) by a thermally conductive adhesive.
5. The waxing assay system according to claim 1 or 2, further comprising a thermostatic device (150), the sample cartridge (120) being located within the thermostatic device (150).
6. A waxing tube, characterized in that, it comprises a barrel (10) with one end closed, two serpentines (20) for heat exchange with the barrel (10), a liquid inlet pipe (30) extending from the inside to the outside of the barrel (10) and a liquid outlet pipe (40) extending from the inside to the outside of the barrel (10), the serpentines (20) are positioned in the barrel (10) and extend along the axial spiral of the barrel (10), the two serpentines (20) are interlaced into a double spiral, the two serpentines (20) are provided with a liquid inlet end (20 a) and a liquid outlet end (20 b), the liquid inlet end (20 a) of one serpentine (20) of the two serpentines (20) is positioned at the liquid outlet end (20 b) of the other serpentine (20) of the two serpentines (20), the liquid outlet end (20 b) of the one serpentine (20) is positioned at the liquid inlet end (20 a) of the other serpentine (20);
the liquid inlet pipe (30) comprises a first Y-shaped pipe (32) and a second vertical pipe (33) parallel to the axis of the barrel body (10), the first end of the first Y-shaped pipe (32) is positioned outside the barrel body (10), the second end of the first Y-shaped pipe (32) is communicated with the liquid inlet end (20 a) of the coiled pipe (20), the third end of the first Y-shaped pipe (32) is communicated with one end of the second vertical pipe (33), the other end of the second vertical pipe (33) is communicated with the liquid inlet end (20 a) of the coiled pipe (20),
the liquid outlet pipe (40) comprises a second Y-shaped pipe (43) and a third vertical pipe (44) parallel to the axis of the barrel body (10), the first end of the second Y-shaped pipe (43) is positioned outside the barrel body (10), the second end of the second Y-shaped pipe (43) is communicated with one end of the third vertical pipe (44), the other end of the third vertical pipe (44) is communicated with the liquid outlet end (20 b) of one of the coiled pipes (20), and the third end of the second Y-shaped pipe (43) is communicated with the liquid outlet end (20 b) of the other coiled pipe (20).
7. The waxing drum according to claim 6, characterized in that the part of the liquid inlet pipe (30) outside the drum body (10) is sleeved with a heat insulation sleeve (50).
8. The waxing drum according to claim 6 or 7, wherein the cross-sectional pattern of the coiled pipe (20) in the axial direction of the drum body (10) has at least one straight edge (201), and the corresponding outer surface of the straight edge (201) is attached to the inner wall of the drum body (10).
9. The waxing drum according to claim 6 or 7, wherein the coiled pipe (20) is bonded with the inner wall of the drum body (10) by heat-conducting glue.
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