CN113654941A - Multifunctional teaching experiment system and method for measuring pressure in petroleum field - Google Patents
Multifunctional teaching experiment system and method for measuring pressure in petroleum field Download PDFInfo
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- CN113654941A CN113654941A CN202111019582.4A CN202111019582A CN113654941A CN 113654941 A CN113654941 A CN 113654941A CN 202111019582 A CN202111019582 A CN 202111019582A CN 113654941 A CN113654941 A CN 113654941A
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
- G01N5/04—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by removing a component, e.g. by evaporation, and weighing the remainder
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
- G01N11/10—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by moving a body within the material
- G01N11/16—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by moving a body within the material by measuring damping effect upon oscillatory body
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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
- G01N25/04—Investigating or analyzing materials by the use of thermal means by investigating changes of state or changes of phase; by investigating sintering of melting point; of freezing point; of softening point
- G01N25/06—Analysis by measuring change of freezing point
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
- G01N5/02—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by absorbing or adsorbing components of a material and determining change of weight of the adsorbent, e.g. determining moisture content
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B19/00—Teaching not covered by other main groups of this subclass
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Abstract
The invention discloses a multifunctional teaching experiment system and an experiment method for measuring under pressure in the field of petroleum, which comprises a nitrogen cylinder, a medicament tank, a metering tank, a wax-dissolving pour point depressing reaction kettle, a wax-preventing viscosity-reducing reaction kettle and a waste liquid tank, wherein the wax-dissolving pour point depressing reaction kettle and the wax-preventing viscosity-reducing reaction kettle are both positioned in a temperature control test box; the nitrogen cylinder is used for pressurizing the metering tank, the wax-dissolving pour point-reducing reaction kettle and the wax-preventing and viscosity-reducing reaction kettle; the medicament tank is used for providing medicament for the metering tank; the metering tank is used for providing medicaments for the wax-dissolving pour point depressing reaction kettle and the wax-preventing and viscosity-reducing reaction kettle; the waste liquid tank is used for recovering waste liquid of the wax-dissolving pour point-reducing reaction kettle and the wax-preventing and viscosity-reducing reaction kettle; the wax dissolving and pour point depressing reaction kettle is used for measuring the wax dissolving rate and pour point depressing rate of the medicament; the wax-proof viscosity-reducing reaction kettle is used for measuring the wax-proof rate and the viscosity-reducing rate of the medicament. The invention is used for realizing the integrated test of wax dissolution, pour point depression, viscosity reduction and wax prevention of unconventional clear paraffin inhibitor and viscosity reduction pour point depressant, and is beneficial to the efficient development of experimental teaching.
Description
Technical Field
The invention relates to the field of petroleum and natural gas, in particular to a multifunctional teaching experiment system and an experiment method for measuring pressure in the field of petroleum.
Background
The wax deposition of a shaft is a common problem in the production process of an oil well, the wax deposition phenomenon can occur along with the reduction of temperature and pressure in the flowing process of wax-containing crude oil in the shaft, wax deposited on the inner wall of an oil pipe causes the narrowing of a shaft flow passage, the yield of the oil well is reduced, and even the oil pipe is blocked in serious cases, and the oil well stops production. The thickened oil is used as an unconventional oil gas resource, the viscosity is high, the flow resistance in a shaft is large, the lifting difficulty is large, and the viscosity reduction and pour point depression of the thickened oil are the key points for exploiting the thickened oil.
At present, a plurality of processes for removing wax and reducing viscosity and pour point of a shaft are provided, wherein the processes for removing wax and reducing viscosity and pour point of a chemical agent are widely adopted with the characteristics of wide adaptability, high efficiency, simple operation and the like, but the field use effects of the wax removing and preventing agent and the reducing viscosity and pour point of the chemical agent are often greatly different from the indoor experimental evaluation results, one important reason is that the research and development of the wax removing and preventing agent and the reducing viscosity and pour point of the chemical agent and the effect evaluation of the reducing viscosity and pour point of the chemical agent are usually carried out under normal pressure according to related industrial standards or enterprise standards such as 'clear and wax removing agent for oil recovery' SY/T6300-. Moreover, with the development and development of unconventional clear paraffin inhibitors and viscosity-reducing pour point depressants which are gaseous at normal pressure, the experimental devices and test methods in the above standards have not been able to achieve the effect evaluation of such agents. Meanwhile, the oil well wax removal and prevention process technology and the thick oil exploitation process technology are important sections in high school teaching materials such as oil extraction engineering and ocean oil and gas engineering, and are course contents which must be mastered by oil engineering and ocean oil and gas engineering major, however, no multifunctional teaching experiment equipment which can integrate the measurement of the wax dissolution rate, the wax prevention rate, the viscosity reduction rate and the pour point reduction rate into a whole exists in the prior art, and the processes of wax dissolution, wax prevention, viscosity reduction, pour point reduction and the like are difficult to visually and rapidly show for students.
Disclosure of Invention
The invention provides a multifunctional teaching experiment system and an experiment method for under-pressure measurement in the field of petroleum, which are used for solving the problems that in the prior art, an evaluation experiment of an unconventional clear paraffin inhibitor and a viscosity-reducing pour point depressant which are in a gas state under normal pressure cannot be carried out, and the processes of paraffin dissolution, paraffin prevention, viscosity reduction, pour point reduction and the like cannot be intuitively and quickly displayed for students, realizing the integrated test of paraffin dissolution, pour point reduction, viscosity reduction and paraffin prevention of the unconventional clear paraffin inhibitor and the viscosity-reducing pour point depressant and are beneficial to the purpose of high-efficiency development of experiment teaching.
The invention is realized by the following technical scheme:
the multifunctional teaching experiment system for the under-pressure measurement in the petroleum field comprises a nitrogen cylinder, a medicament tank, a metering tank, a wax-dissolving pour point depressing reaction kettle, a wax-preventing viscosity-reducing reaction kettle and a waste liquid tank, wherein the wax-dissolving pour point depressing reaction kettle and the wax-preventing viscosity-reducing reaction kettle are both positioned in a temperature control test box;
the nitrogen cylinder is used for pressurizing the metering tank, the wax-dissolving pour point-reducing reaction kettle and the wax-preventing and viscosity-reducing reaction kettle;
the medicament tank is used for providing medicament for the metering tank;
the metering tank is used for providing medicaments for the wax-dissolving pour point-reducing reaction kettle and the wax-preventing and viscosity-reducing reaction kettle;
the waste liquid tank is used for recovering waste liquid of the wax-dissolving pour point-reducing reaction kettle and the wax-preventing and viscosity-reducing reaction kettle;
the wax dissolving and pour point depressing reaction kettle is used for measuring the wax dissolving rate and pour point depressing rate of the medicament;
the wax-proof viscosity-reducing reaction kettle is used for measuring the wax-proof rate and the viscosity-reducing rate of the medicament.
Aiming at the problems that the evaluation experiment of the unconventional paraffin inhibitor and viscosity-reducing pour-point depressant which are gaseous at normal pressure can not be carried out in the prior art, and the processes of paraffin dissolution, paraffin prevention, viscosity reduction, pour point reduction and the like can not be intuitively and rapidly displayed for students, the invention firstly provides a multifunctional teaching experiment system for the belt pressure measurement in the petroleum field, wherein a nitrogen bottle is used for pressurizing downstream equipment such as a metering tank, a paraffin dissolution and pour point reduction reaction kettle, a paraffin prevention and viscosity reduction reaction kettle and the like in the system so as to meet the stability experiment of the unconventional paraffin inhibitor and viscosity-reducing pour-point depressant which are gaseous at normal pressure; the medicament tank stores gaseous medicaments under pressure, the gaseous medicaments are liquefied under the pressurization of nitrogen after entering the metering tank, and the metering tank is used for metering the liquid volume of the medicaments. In the experimental process, the temperature control test box regulates and controls the environmental temperature of the wax-dissolving and pour-point-reducing reaction kettle, the wax-preventing and viscosity-reducing reaction kettle and the crude oil serving as a sample; the waste liquid after the experiment is discharged to the waste liquid tank and is recycled to avoid leakage of the unconventional paraffin removal and inhibition agent and the viscosity reduction pour point depressant which are in a gas state under normal pressure, and the unconventional medicaments can be recycled while potential safety hazards are avoided. The wax-dissolving pour point depressing reaction kettle is used for wax-dissolving and pour point testing experiments to determine the wax-dissolving rate and pour point depressing rate of the medicament; the paraffin control and viscosity reduction reaction kettle is used for viscosity test and wax precipitation experiments to measure the paraffin control rate and the viscosity reduction rate of the medicament.
Compared with the prior art, the method comprises the following steps: firstly, the two kettles have four purposes, and the wax dissolving experiment, the condensation point test, the viscosity test and the wax precipitation experiment can be completed through one set of complete operation, so that the experiment steps are reduced, the functionality is strong, the experiment time and the experiment space are obviously saved, the experiment efficiency is obviously improved, and the oil product detection can be quickly completed in the engineering field; secondly, the method overcomes the defect that the evaluation experiment of the unconventional clear paraffin inhibitor and viscosity-reducing pour point depressant which are in a gas state at normal pressure can not be carried out in the prior art, can be used for carrying out the measurement of the paraffin dissolving rate, the paraffin prevention rate, the viscosity reduction rate and the pour point reduction rate of a liquid reagent and a low saturated vapor pressure gaseous reagent, and realizes the integrated test of the paraffin dissolving rate, the pour point reduction rate, the viscosity reduction and the paraffin prevention of the unconventional clear paraffin inhibitor and the viscosity-reducing pour point depressant; moreover, the method has extremely high experimental efficiency, so that the defect that the measurement experiment of the wax dissolving rate, the wax prevention rate, the viscosity reduction rate and the pour point depression rate needs to be separately carried out in the teaching process in the prior art is overcome, the processes and effects of the wax dissolving rate, the wax prevention rate, the viscosity reduction rate, the pour point depression rate and the like can be visually and rapidly displayed for students in limited classroom time, more students can manually operate and carry out the experiment in limited classroom time, and therefore the students can more visually and deeply understand the related contents of the chemical agent wax removal and prevention and viscosity reduction pour point depression technology, grasp the evaluation method of the effects of the wax removal and prevention agent and the viscosity reduction pour point depression agent, and improve the experimental operation capacity and the logic capacity of the students.
Further, the output end of the nitrogen cylinder is sequentially provided with a pressure reducing valve and a safety valve;
a metering tank pressurization valve is arranged between the safety valve and the metering tank;
a wax-dissolving pour point depressing reaction kettle pressurizing valve is arranged between the safety valve and the wax-dissolving pour point depressing reaction kettle;
and a wax-proof viscosity-reducing reaction kettle pressure valve is arranged between the safety valve and the wax-proof viscosity-reducing reaction kettle.
According to the scheme, even if the pressure reducing valve and the safety valve are sequentially arranged on the outlet pipeline of the nitrogen cylinder, the outlet pressure of nitrogen is adjusted through the pressure reducing valve, and the safety in use of the nitrogen cylinder is improved through the safety valve; the nitrogen gas flows through the safety valve and then provides nitrogen gas for downstream processes, and specifically, the nitrogen gas is communicated with a metering tank through a metering tank pressure valve, communicated with the interior of a wax-dissolving pour point depressing reaction kettle through a wax-dissolving pour point depressing reaction kettle pressure valve and communicated with a wax-preventing and viscosity-reducing reaction kettle through a wax-preventing and viscosity-reducing reaction kettle pressure valve; wherein, metering tank pressure valve is used for controlling metering tank internal pressure, dissolves wax pour point depression reation kettle pressure valve and is used for controlling and dissolves wax pour point depression reation kettle internal pressure, and wax control viscosity reduction reation kettle pressure valve is used for controlling wax control viscosity reduction reation kettle internal pressure to fully ensure that the unconventional medicament that is gaseous state under the atmospheric pressure remains liquid all the time in order to satisfy the experiment demand in this system experimentation.
Further, a medicament valve is arranged between the medicament tank and the metering tank;
an additive valve of the wax-dissolving pour point depressing reaction kettle is arranged between the metering tank and the wax-dissolving pour point depressing reaction kettle, and an additive valve of the wax-preventing and viscosity-reducing reaction kettle is arranged between the metering tank and the wax-preventing and viscosity-reducing reaction kettle;
a wax-dissolving pour point depressing reaction kettle blow-down valve is arranged between the wax-dissolving pour point depressing reaction kettle and the waste liquid tank, and a wax-preventing viscosity-reducing reaction kettle blow-down valve is arranged between the wax-preventing viscosity-reducing reaction kettle and the waste liquid tank;
the device also comprises a wax-dissolving pour point depressing reaction kettle pressure release valve, a wax-preventing viscosity-reducing reaction kettle pressure release valve and a waste liquid tank pressure release valve which are respectively used for releasing the pressure of the wax-dissolving pour point depressing reaction kettle, the wax-preventing viscosity-reducing reaction kettle and the waste liquid tank.
In the scheme, the additive valve of the wax-dissolving pour point depressing reaction kettle and the additive valve of the wax-preventing and viscosity-reducing reaction kettle are respectively used for adding medicaments into the wax-dissolving pour point depressing reaction kettle and the wax-preventing and viscosity-reducing reaction kettle from a metering tank; and the wax-dissolving pour point depressing reaction kettle blow-down valve and the wax-preventing and viscosity-reducing reaction kettle blow-down valve are respectively used for discharging the medicament from the corresponding reaction kettle to a waste liquid tank for recycling. Because the experimental reagent of this application need face unconventional medicament, consequently the waste liquid jar is the closed vessel equally, is difficult to accomplish the pressure release among the blowdown process, consequently this application still need for the wax dissolving pour point depressing reation kettle, wax control viscosity reduction reation kettle, waste liquid jar dispose corresponding relief valve alone in order to realize respective pressure release.
Further, transparent parts for observation are arranged on the surfaces of the metering tank, the wax-dissolving pour point-reducing reaction kettle and the wax-preventing and viscosity-reducing reaction kettle; the wax-dissolving pour point-reducing reaction kettle and the wax-preventing and viscosity-reducing reaction kettle are both provided with stirring devices;
the downstream end of the metering tank pressurization valve is provided with a metering tank pressure gauge for monitoring the pressure in the metering tank;
the downstream end of the pressure valve of the wax-dissolving pour point depressing reaction kettle is provided with a wax-dissolving pour point depressing reaction kettle pressure gauge for monitoring the pressure in the wax-dissolving pour point depressing reaction kettle;
the downstream end of the pressure valve of the paraffin control viscosity reduction reaction kettle is provided with a paraffin control viscosity reduction reaction kettle pressure gauge for monitoring the pressure in the paraffin control viscosity reduction reaction kettle;
the device also comprises a waste liquid tank pressure gauge for monitoring the pressure in the waste liquid tank.
The transparent part can be a local area or a whole area corresponding to the surface of the tank body or the kettle body, so that the internal condition of the container can be directly observed, the liquid volume in each container and/or the experimental phenomenon in the kettle can be observed under pressure, and the teaching experiment and the process of melting wax, waxing and the like can be more visually and vividly displayed for students; the material of this application to transparent portion does not do the restriction, nevertheless needs to satisfy and can not pollute experiment medicament and crude oil, and the pressure-bearing capacity satisfies the required pressure of experiment.
The wax-dissolving pour point depressing reaction kettle and the wax-preventing and viscosity-reducing reaction kettle are respectively provided with an independent stirring device and used for quickly and uniformly mixing the experimental medicament with crude oil and the like.
Each manometer is used for the pressure in the monitoring corresponding container to accurate control and adjustment to experimental pressure in the experimentation ensures the accurate survey of this application to unconventional medicament more.
Further, the wax dissolving and pour point depressing reaction kettle comprises a first cylinder wall, a first upper end cover and a first lower end cover which are respectively connected with two ends of the first cylinder wall in a sealing mode, and a first top cover which is matched with the first upper end cover in a sealing mode, wherein the first top cover is detachably connected with the first upper end cover through a first buckle;
the first upper end cover is provided with a first channel for adding agent, pressurizing and decompressing, and the first lower end cover is provided with a first liquid discharge port for discharging liquid;
the inner wall of the first upper end cover is also fixedly connected with a ball track for placing wax balls, and the ball track gradually inclines upwards from one end close to the inner wall of the first upper end cover to one end far away from the inner wall of the first upper end cover;
the filter baffle plate is fixed at the top of the first lower end cover and divides the interior of the first cylinder wall into two parts, and the first liquid discharge port and the ball track are respectively positioned at two sides of the filter baffle plate;
the wax melting and pour point depressing device also comprises an angle adjusting mechanism for inclining the wax melting and pour point depressing reaction kettle.
The first cylinder wall of the wax-dissolving pour point depressing reaction kettle is fixed and sealed through the upper end cover and the lower end cover, the first upper end cover is sealed through the first top cover, and the existing sealing mode can be applied. One side of the first upper end cover is provided with a channel for adding, pressurizing and emptying the wax-dissolving pour point depressing reaction kettle, which is called as a first channel, and the first channel can be correspondingly communicated with a metering tank, a nitrogen bottle, an emptying pipe valve and the like as required; the first lower end cover is provided with a first liquid discharge port for discharging liquid, and the first liquid discharge port is communicated with a waste liquid tank.
Still set up the ball rail on the first upper end cover, when dissolving the wax pour point depression reation kettle cauldron body and be vertical state, the ball rail from the one end that is close to first upper end cover inner wall to the one end of keeping away from first upper end cover inner wall tilt up gradually to ensure that the wax ball of placing on the ball rail can not drop automatically.
Filter baffle and be used for dissolving wax experiment and end back separation liquid medicament and remaining wax ball, need to guarantee that first drainage mouth, ball track are located filter baffle's both sides respectively, and the wax ball gets into one side of filter baffle and dissolves the experiment, and the experiment is accomplished back liquid and is drained away from the first drainage mouth of filter baffle opposite side, ensures to weigh the recovery of remaining wax ball, avoids remaining wax ball to be drained away and leads to the experiment unable completion. Of course, the mesh number of the filtering baffle plate is adaptively selected according to actual conditions, so that the liquid medicament can freely pass through and the residual wax balls after the experiment is completed can not pass through.
Angle adjustment mechanism is used for whole slope to dissolve wax pour point depression reation kettle, and its function mainly includes: the wax ball placed on the ball track falls downwards to the space on the same side of the filtering baffle plate to carry out a wax dissolving experiment, inclines by a specified angle to determine the condensation point of crude oil, and completes the determination of the pour point depression rate of a medicament on the crude oil.
Further, the first upper end cover and the first lower end cover are fixedly connected through a first bolt;
a first thermometer inserting tube inserted into the first cylinder wall is arranged on the first top cover;
the top of filtering baffle highly be higher than the height of ball rail, and the top of filtering baffle has the stop gear that prevents the wax ball residue after the dissolution from removing to filtering baffle opposite side.
The thermometer inserting tube on the first top cover is used for inserting a thermometer to monitor the temperature in the wax-dissolving pour point depressing reaction kettle, the size of the thermometer inserting tube and the size of the thermometer to be inserted are matched as much as possible, and the gap is small enough to improve the measurement precision; the stable work of unconventional medicament under the pressure condition is fully guaranteed through the arrangement of the thermometer inserting tube.
The top height of filtering baffle is higher than the height of ball rail to when avoiding dissolving wax pour point depression reation kettle whole slope, the wax ball of placing on the ball rail drops to filtering baffle opposite side (the one side at first drain hole place promptly). The limiting mechanism can thoroughly avoid the problem that the residual wax balls flow along with the fluid in the liquid discharging process or move to the other side of the filtering baffle plate under the action of gravity due to the fact that the reaction kettle is inclined; the specific structure of the limiting mechanism is not limited, and only effective blocking of residual wax balls is required.
Furthermore, the angle adjusting mechanism comprises a dial and a rotating rod, the lower end of the rotating rod is hinged with the dial, and the upper end of the rotating rod is connected with a handle; the rotating rod is fixedly connected with the wax-dissolving pour point depressing reaction kettle, and the axis of the rotating rod is parallel to and coplanar with the axis of the wax-dissolving pour point depressing reaction kettle; the dial is provided with angle scales, a plurality of first pin holes are uniformly distributed on the dial along the circumferential direction, and the rotating rod is provided with second pin holes matched with the first pin holes.
The calibrated scale is fixed at any position in the laboratory as a relatively static object, the rotary rod is fixed with the wax dissolving and pour point depressing reaction kettle, and the lower end of the rotary rod is hinged on the calibrated scale, so that the wax dissolving and pour point depressing reaction kettle is driven to synchronously rotate in the rotating process, and the wax dissolving and pour point depressing reaction kettle is inclined to a specified angle. Because the axis of the rotating rod is parallel to and coplanar with the axis of the wax-dissolving pour point depressing reaction kettle, the inclination angle of the wax-dissolving pour point depressing reaction kettle can be accurately controlled by the corresponding pointing angle of the rotating rod on the dial. When specifically using, dissolve wax through the handle drive and fall and congeal reation kettle and rotate to appointed inclination, then pass the pin second pinhole and first pinhole and realize temporarily fixed can.
Further, the wax-proof viscosity-reducing reaction kettle comprises a second cylinder wall, a second upper end cover and a second lower end cover which are respectively connected with two ends of the second cylinder wall in a sealing manner, and a second top cover which is matched with the second upper end cover in a sealing manner, wherein the second top cover is detachably connected with the second upper end cover through a second buckle;
a second channel for adding agent, pressurizing and decompressing is formed in the second upper end cover, and a second liquid discharging port for discharging liquid is formed in the second lower end cover;
connect vibration viscometer, second thermometer insert tube, wax deposition pipe on the second top cap, wax deposition pipe and circulating water bath intercommunication.
Wherein the vibration viscometer is used for viscosity measurement to realize the calculation of viscosity reduction rate. The circulating water bath is used for providing a temperature difference environment to realize rapid wax precipitation.
The bottom of the second top cover is provided with a mounting head which extends out along the axial direction, and the sealing cover is in threaded connection with the mounting head; the bottom of the sealing cover is provided with a through hole for the wax deposition pipe to pass through, a step surface is formed between the outer wall of the through hole and the inner wall of the sealing cover, the top of the wax deposition pipe is provided with a seat hanging part which extends out along the radial direction, and the wax deposition pipe is hung on the step surface through the seat hanging part; sealing gaskets are arranged between the seat hanging part and the step surface and between the seat hanging part and the mounting head; the wax deposition device is characterized by further comprising a cold water injection pipe and a cold water outlet pipe, the cold water injection pipe penetrates through the second top cover, the cold water injection pipe extends into the bottom end of the wax deposition pipe, the cold water outlet pipe extends into the mounting head, and cold water enters the cold water injection pipe from the circulating water bath kettle and flows back to the circulating water bath kettle from the cold water outlet pipe.
In the scheme, the connection with the sealing cover is realized through the mounting head, and the mounting and positioning of the paraffin tube are realized through the step surface at the bottom of the sealing cover; during specific installation, the second top cover is screwed, the second top cover is communicated with the installation head to continuously move downwards under the action of the threads, the sealing gaskets between the seat hanging part and the step surface and between the seat hanging part and the installation head are extruded to ensure a stable sealing effect, and meanwhile, the wax deposition pipe is firmly abutted against the step surface to keep stable.
Different from the internal wax precipitation of a conventional wax precipitation experiment, the wax precipitation is carried out on the outer wall of the wax precipitation pipe; and, wax pipe adopts the extrusion sealing mode in this application, compares with directly using thread sealing, wearing and tearing when having reduced the dismouting of wax pipe, and then has reduced the measuring error of wax volume. This application is when carrying out the wax precipitation experiment, can accomplish the viscosity test by the way, and then can survey the viscosity reduction rate when survey wax control rate.
Based on the experimental method of the multifunctional teaching experimental system for measuring pressure in the petroleum field, the experimental method comprises the following steps:
s1, releasing pressure of the metering tank, the wax-dissolving and pour-point-reducing reaction kettle, the wax-preventing and viscosity-reducing reaction kettle and the waste liquid tank, and stopping all valves in the teaching experiment system after pressure release is finished;
s2, enabling a sufficient amount of medicament to enter the metering tank from the medicament tank;
s3, carrying out a wax dissolving experiment through a wax dissolving and pour point depressing reaction kettle, in the experiment process, providing a medicament through a metering tank, pressurizing through a nitrogen bottle, adjusting the temperature through a temperature control test box, and recycling waste liquid through a waste liquid tank;
s4, carrying out a condensation point test experiment through a wax-dissolving and pour point-reducing reaction kettle, in the experiment process, providing a medicament through a metering tank, pressurizing through a nitrogen bottle, adjusting the temperature through a temperature control test box, and recycling waste liquid through a waste liquid tank;
s5, viscosity test experiment and wax precipitation experiment are carried out through the wax-proof viscosity reduction reaction kettle, in the experiment process, a reagent is provided through a metering tank, pressurization is carried out through a nitrogen bottle, the oil temperature is adjusted through a temperature control test box, and waste liquid is recovered through a waste liquid tank.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the invention relates to a multifunctional teaching experiment system and an experiment method for measuring under pressure in the field of petroleum, wherein two kettles are used for four purposes, and the wax dissolution measurement, the condensation point measurement, the viscosity measurement and the wax precipitation measurement can be completed through one set of complete operation, so that the experiment steps are reduced, the functionality is strong, the experiment time and space are obviously saved, the experiment efficiency is obviously improved, and the oil product detection and the medicament test can be rapidly completed on the engineering site.
2. The invention relates to a multifunctional teaching experiment system and an experiment method for belt pressure measurement in the field of petroleum, which overcome the defect that the prior art can not carry out the evaluation experiment of unconventional clear paraffin inhibitor and viscosity-reducing pour point depressant which are in a gas state under normal pressure, can be used for carrying out the measurement of the paraffin dissolving rate, paraffin preventing rate, viscosity-reducing rate and pour point reducing rate of liquid reagents and low saturated vapor pressure gaseous reagents, and realizes the integrated test of paraffin dissolving, pour point reducing, viscosity reducing and paraffin preventing of the unconventional clear paraffin inhibitor and the viscosity-reducing pour point depressant.
3. The invention relates to a multifunctional teaching experiment system and an experiment method for under-pressure measurement in the field of petroleum, which solve the defect that the measurement experiments of the wax dissolving rate, the wax prevention rate, the viscosity reduction rate and the pour point depression rate need to be separately carried out in the teaching process in the prior art, can fully utilize the processes and effects of the wax dissolving rate, the wax prevention rate, the viscosity reduction rate, the pour point depression rate and the like for students to visually and rapidly display in a limited classroom time, and can also enable more students to manually operate and carry out the experiments in the limited classroom time, so that the students can more visually and deeply comprehend the related contents of the chemical agent wax removal and viscosity reduction pour point depression technology, master the evaluation methods of the wax removal and viscosity reduction pour point depression effects, and improve the experimental operation capacity and the logic capacity of the students.
4. The invention relates to a multifunctional teaching experiment system and an experiment method for under-pressure measurement in the field of petroleum.
5. The multifunctional teaching experiment system and the experiment method for measuring under pressure in the petroleum field can accurately control the inclination angle of the wax dissolving and pour point depressing reaction kettle through the corresponding pointing angle of the rotating rod on the dial, and compared with the manual inclination mode in the prior art, the experiment precision is obviously improved; besides, the mechanism is used for measuring the condensation point and the pour point depression rate, and can also play a role in driving the wax ball to fall in the wax dissolving experiment process.
6. The invention relates to a multifunctional teaching experiment system and an experiment method for belt pressure measurement in the field of petroleum.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a schematic diagram of a system in accordance with an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a wax-dissolving pour point depressing reaction kettle according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a wax-dissolving pour point depressing reactor according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a wax-control viscosity-reducing reaction kettle according to an embodiment of the present invention;
FIG. 5 is a schematic view of the connection of a wax deposition pipe according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a metering tank in an embodiment of the present invention.
Reference numbers and corresponding part names in the drawings:
1-nitrogen bottle, 2-medicament tank, 3-metering tank, 301-third cylinder wall, 302-third upper end cover, 303-third lower end cover, 304-third bolt, 305-pressurization vent, 306-additive agent-adding agent-discharging port, 4-wax-dissolving pour-point depressing reaction kettle, 401-first cylinder wall, 402-first upper end cover, 403-first lower end cover, 404-first buckle, 405-first top cover, 406-first channel, 407-first liquid-discharging port, 408-ball rail, 409-filtering baffle, 410-first bolt, 411-first thermometer insertion tube, 412-dial scale, 413-rotating rod, 414-handle, 415-first pin hole, 416-second pin hole, 417-wax ball, 5-polytetrafluoroethylene sealing ring, 6-wax-proof viscosity-reducing reaction kettle, 601-second cylinder wall, 602-second upper end cover, 603-second lower end cover, 604-second top cover, 605-second buckle, 606-second channel, 607-second liquid outlet, 608-vibration viscometer, 609-second thermometer insert tube, 610-wax-forming tube, 611-sealing cover, 612-through hole, 613-hanging part, 614-sealing gasket, 615-cold water injection tube, 616-cold water outlet tube, 617-mounting head, 618-second bolt, 7-magnetic stirrer, 8-data acquisition computer, 9-temperature control box, 10-circulating water bath, 11-waste liquid tank, 12-pressure reducing valve, 13-safety valve, 14-medicament valve, 15-metering tank pressure valve, 16-wax-dissolving pour point depressing reaction kettle pressure valve, 17-wax-dissolving pour point depressing reaction kettle additive valve, 18-drainage valve, 19-wax-dissolving pour point depressing reaction kettle pressure relief valve, 20-wax-dissolving pour point depressing reaction kettle blow-down valve, 21-wax-preventing and viscosity-reducing reaction kettle pressure valve, 22-wax-preventing and viscosity-reducing reaction kettle pressure relief valve, 23-wax-preventing and viscosity-reducing reaction kettle additive valve, 24-wax-preventing and viscosity-reducing reaction kettle blow-down valve, 25-waste liquid tank pressure relief valve, 26-waste liquid tank inlet valve, 27-measuring tank pressure gauge, 28-wax-dissolving pour point depressing reaction kettle pressure gauge, 29-wax-preventing and viscosity-reducing reaction kettle pressure gauge, 30-waste liquid tank pressure gauge and 31-stirrer.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention. In the description of the present application, it is to be understood that the terms "front", "back", "left", "right", "upper", "lower", "vertical", "horizontal", "high", "low", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the scope of the present application.
Example 1:
the multifunctional teaching experiment system for the belt pressure measurement in the petroleum field as shown in fig. 1 comprises a nitrogen cylinder 1, a medicament tank 2, a metering tank 3, a wax-dissolving pour point depressing reaction kettle 4, a wax-preventing viscosity-reducing reaction kettle 6 and a waste liquid tank 11, wherein the wax-dissolving pour point depressing reaction kettle 4 and the wax-preventing viscosity-reducing reaction kettle 6 are both positioned in a temperature control test box 9;
the nitrogen cylinder 1 is used for pressurizing the metering tank 3, the wax-dissolving pour point-reducing reaction kettle 4 and the wax-preventing and viscosity-reducing reaction kettle 6; the medicament tank 2 is used for providing medicament for the metering tank 3; the metering tank 3 is used for providing medicaments for the wax-dissolving and pour-point-reducing reaction kettle 4 and the wax-preventing and viscosity-reducing reaction kettle 6; the waste liquid tank 11 is used for recovering waste liquid of the wax-dissolving pour point-reducing reaction kettle 4 and the wax-preventing and viscosity-reducing reaction kettle 6; the wax dissolving and pour point depressing reaction kettle 4 is used for measuring the wax dissolving rate and pour point depressing rate of the medicament; the wax-proof viscosity-reducing reaction kettle 6 is used for measuring the wax-proof rate and the viscosity-reducing rate of the medicament.
The output end of the nitrogen cylinder 1 is sequentially provided with a pressure reducing valve 12 and a safety valve 13; a metering tank pressurization valve 15 is arranged between the safety valve 13 and the metering tank 3; a wax-dissolving pour point depressing reaction kettle pressure valve 16 is arranged between the safety valve 13 and the wax-dissolving pour point depressing reaction kettle 4; a wax-proof viscosity-reducing reaction kettle pressurizing valve 21 is arranged between the safety valve 13 and the wax-proof viscosity-reducing reaction kettle 6.
A chemical valve 14 is arranged between the metering tank 3 and the liquid container; a wax-dissolving pour point depressing reaction kettle additive valve 17 is arranged between the metering tank 3 and the wax-dissolving pour point depressing reaction kettle 4, and a wax-preventing viscosity-reducing reaction kettle additive valve 23 is arranged between the metering tank 3 and the wax-preventing viscosity-reducing reaction kettle 6; a wax-dissolving pour point depressing reaction kettle blow-down valve 20 is arranged between the wax-dissolving pour point depressing reaction kettle 4 and the waste liquid tank 11, and a wax-preventing viscosity-reducing reaction kettle blow-down valve 24 is arranged between the wax-preventing viscosity-reducing reaction kettle 6 and the waste liquid tank 11;
the device also comprises a wax-dissolving pour point depressing reaction kettle pressure release valve 19, a wax-preventing viscosity-reducing reaction kettle pressure release valve 22 and a waste liquid tank pressure release valve 25 which are respectively used for releasing pressure for the wax-dissolving pour point depressing reaction kettle 4, the wax-preventing viscosity-reducing reaction kettle 6 and the waste liquid tank 11.
Transparent parts for observation are arranged on the surfaces of the metering tank 3, the wax-dissolving pour point-reducing reaction kettle 4 and the wax-preventing and viscosity-reducing reaction kettle 6; the wax-dissolving pour point-reducing reaction kettle 4 and the wax-preventing and viscosity-reducing reaction kettle 6 are both provided with stirring devices; a metering tank pressure gauge 27 for monitoring the pressure in the metering tank 3 is arranged at the downstream end of the metering tank pressurization valve 15; a wax-dissolving pour point depressing reaction kettle pressure gauge 28 for monitoring the pressure in the wax-dissolving pour point depressing reaction kettle 4 is arranged at the downstream end of the wax-dissolving pour point depressing reaction kettle pressurizing valve 16; a wax-proof viscosity-reducing reaction kettle pressure gauge 29 for monitoring the pressure in the wax-proof viscosity-reducing reaction kettle 6 is arranged at the downstream end of the wax-proof viscosity-reducing reaction kettle pressurizing valve 21; and a waste liquid tank pressure gauge 30 for monitoring the pressure in the waste liquid tank 11.
The stirring device in this embodiment is a magnetic stirrer 7, the wax-dissolving pour-point-reducing reaction kettle 4 and the wax-preventing viscosity-reducing reaction kettle 6 are respectively equipped with a group of magnetic stirrers 7, and those skilled in the art should know that the corresponding kettle body is inevitably provided with a matched stirrer 31.
As shown in fig. 1, the present embodiment further includes a waste agent discharge valve 18 and a waste liquid tank inlet valve 26, and may be opened when waste liquid is recovered.
In one or more preferred embodiments, the metering tank 3 shown in fig. 6 includes a third cylinder wall 301, a third upper end cover 302, and a third lower end cover 303, and the third upper end cover 302 and the third lower end cover 303 are fixedly connected by a third bolt 304; the third upper end cover 302 is provided with a pressurization vent 305, and the third lower end cover 303 is provided with an agent adding and discharging port 306.
Preferably, the third cylinder wall 301 is made of quartz glass and has scales, and the third upper and lower end caps are made of stainless steel.
The function of the embodiment is diversified, the integrated test of wax dissolution, pour point depression, viscosity reduction and wax prevention under the condition of pressure is realized, and the effect evaluation of the unconventional clear wax inhibitor and the viscosity reduction pour point depressant which are gaseous under normal pressure can be developed; the reaction kettle has four purposes of two kettles, the wax-proof viscosity-reducing reaction kettle can simultaneously carry out viscosity test and wax precipitation experiment under pressure, the experiment steps are reduced, the experiment time and space are saved, and the experiment efficiency is improved; the structure and the sealing mode of the paraffin control viscosity reduction reaction kettle and the paraffin tube reduce the measurement error of the paraffin amount and improve the precision of experimental data; the wax dissolving and pour point depressing reaction kettle can realize the quick separation of the wax ball and the medicament after the wax dissolving experiment is finished, and meanwhile, the operation is convenient, the inclination angle is accurate, and the operation error is effectively reduced; moreover, the observation of the process and the phenomenon is convenient to realize, and the experimental teaching is facilitated.
Example 2:
a multi-functional teaching experiment system of area pressure survey for oil field, on embodiment 1's basis, the structure of the wax-dissolving pour point depressing reation kettle 4 in this embodiment is as shown in fig. 2 and fig. 3: the device comprises a first cylinder wall 401, a first upper end cover 402 and a first lower end cover 403 which are respectively connected with two ends of the first cylinder wall 401 in a sealing mode, and a first top cover 405 which is matched on the first upper end cover 402 in a sealing mode, wherein the first top cover 405 and the first upper end cover 402 are detachably connected through a first buckle 404; a first channel 406 for adding agent, pressurizing and decompressing is arranged on the first upper end cover 402, and a first liquid discharge port 407 for discharging liquid is arranged on the first lower end cover 403;
the inner wall of the first upper end cover 402 is also fixedly connected with a ball rail 408 for placing wax balls, and the ball rail 408 gradually inclines upwards from one end close to the inner wall of the first upper end cover 402 to one end far away from the inner wall of the first upper end cover 402;
the filter device further comprises a filter baffle 409 fixed at the top of the first lower end cover 403, the filter baffle 409 divides the interior of the first cylinder wall 401 into two parts, and the first liquid discharge port 407 and the ball rail 408 are respectively located on two sides of the filter baffle 409; and the device also comprises an angle adjusting mechanism for inclining the wax-dissolving pour point depressing reaction kettle 4.
The first upper end cover 402 and the first lower end cover 403 are fixedly connected through a first bolt 410;
a first thermometer insertion tube 411 inserted into the first cylinder wall 401 is provided on the first top cover 405;
the top end of the filtering baffle 409 is higher than the ball rail 408, and the top end of the filtering baffle 409 is provided with a limiting mechanism for preventing the dissolved wax ball residue from moving to the other side of the filtering baffle 409.
The angle adjusting mechanism in the embodiment comprises a dial 412 and a rotating rod 413, wherein the lower end of the rotating rod 413 is hinged with the dial 412, and the upper end of the rotating rod 413 is connected with a handle 414; the rotating rod 413 is fixedly connected with the wax dissolving and pour point depressing reaction kettle 4, and the axis of the rotating rod 413 is parallel to and coplanar with the axis of the wax dissolving and pour point depressing reaction kettle 4; the dial 412 is provided with angle scales, a plurality of first pin holes 415 are uniformly distributed on the dial 412 along the circumferential direction, and a second pin hole 416 matched with the first pin holes 415 is arranged on the rotating rod 413.
Fig. 2 and 3 respectively show two different forms of limiting mechanisms, wherein the limiting mechanism shown in fig. 2 is used for blocking wax balls by arranging a protrusion at the top end of the filtering baffle 409, and the limiting mechanism shown in fig. 3 is used for preventing the wax balls from moving to the other side of the filtering baffle by extending the height of the filtering baffle 409 and controlling the gap between the filtering baffle 409 and the first top cover 405 to be small enough.
In this embodiment, the section of thick bamboo wall of dissolving wax pour point depression reation kettle is through last, the spacing groove cooperation polytetrafluoroethylene sealing washer and the bolt of lower extreme cover realize fixedly and sealed, one side of upper end cover is equipped with first passageway 406, a dosing for dissolving wax pour point depression reation kettle, pressurization and unloading, the opposite side has welded the half section pipe that the end was slightly perk, as the wax ball track, under the vertical state of dissolving wax pour point depression reation kettle cauldron body, the wax ball can not drop, one side of lower extreme cover is equipped with first drain outlet 407, be used for dissolving wax pour point depression reation kettle flowing back, lower extreme cover intermediate position has welded filtering baffle, be used for dissolving wax experiment back separation medicament and wax ball, filtering baffle both sides have all placed magnetic stirrers, be used for stirring mixed medicament and fluid with the cooperation of outside magnetic stirrers. A thermometer inserting tube is welded on the top cover of the wax-dissolving pour point depressing reaction kettle, and the top cover of the wax-dissolving pour point depressing reaction kettle is fixed and sealed with the kettle body of the wax-dissolving pour point depressing reaction kettle through a buckle. The whole cauldron body of dissolving wax pour point depression reation kettle passes through the clamp to be fixed on the rotary rod, the rotary rod just in time is on the axis of the cauldron body, rotary rod bottom and calibrated scale are rotatory hinge, the rotary rod can drive the cauldron body along left and right direction rotatory, the rotary rod upper end is equipped with handle and bolt hole, anticlockwise calibrated scale is equipped with the bolt hole respectively in 0 °, 45 °, 90 degrees positions department, insert the pin in the accurate back of bolt hole on rotary rod and the calibrated scale, can fix the tilt state of the cauldron body, the cauldron body has enough distance with the base to guarantee that the cauldron body can the level is placed.
Preferably, the first cylinder wall 401 is made of quartz glass.
Example 3:
a take multi-functional teaching experiment system of area pressure survey for oil field, on embodiment 1 or 2 basis, the structure of wax control viscosity reduction reation kettle 6 is shown in fig. 4 in this embodiment:
the device comprises a second cylinder wall 601, a second upper end cover 602 and a second lower end cover 603 which are respectively connected with two ends of the second cylinder wall 601 in a sealing way, and a second top cover 604 which is matched on the second upper end cover 602 in a sealing way, wherein the second top cover 604 is detachably connected with the second upper end cover 602 through a second buckle 605;
a second channel 606 for adding agent, pressurizing and decompressing is formed in the second upper end cover 602, and a second liquid discharge port 607 for discharging liquid is formed in the second lower end cover 603;
the second top cover 604 is connected with a vibration viscometer 608, a second thermometer inserting pipe 609 and a wax precipitation pipe 610, and the wax precipitation pipe 610 is communicated with the circulating water bath 10.
The connecting structure of the wax tube 610 in this embodiment is shown in fig. 5: the bottom of the second top cover 604 is provided with a mounting head 617 which extends along the axial direction, and the sealing cover 611 is in threaded connection with the mounting head 617; a through hole 612 for the wax deposition pipe 610 to pass through is formed at the bottom of the sealing cover 611, a step surface is formed between the outer wall of the through hole 612 and the inner wall of the sealing cover 611, a seat hanging part 613 extending in the radial direction is arranged at the top of the wax deposition pipe 610, and the wax deposition pipe 610 is hung on the step surface through the seat hanging part 613; gaskets 614 are arranged between the hanging part 613 and the step surface and between the hanging part 613 and the mounting head 617; the wax deposition device also comprises a cold water injection pipe 615 and a cold water outlet pipe 616 which penetrate through the second top cover 604, wherein the cold water injection pipe 615 extends into the bottom end of the wax deposition pipe 610, the cold water outlet pipe 616 extends into the mounting head 617, and cold water enters the cold water injection pipe 615 from the circulating water bath kettle 10 and flows back to the circulating water bath kettle 10 from the cold water outlet pipe 616.
In this embodiment, the wall of the paraffin control viscosity reduction reation kettle realizes fixing and sealing through the spacing groove cooperation polytetrafluoroethylene sealing washer and the bolt of upper and lower end cover, and its upper end cover is equipped with second passageway 606 for paraffin control viscosity reduction reation kettle add the agent, pressurize and release air, and the lower end cover is equipped with second leakage fluid dram 607 for paraffin control viscosity reduction reation kettle flowing back, has placed magnetic stirrers in the paraffin control viscosity reduction reation kettle for cooperate the stirring mixed medicament and fluid with outside magnetic stirrers. The vibration viscometer and the wax deposition pipe which are respectively used for viscosity testing and wax deposition experiments in the wax-proof viscosity reduction reaction kettle are both arranged on the second top cover 604, and are fixed and sealed with the top cover by screwing in and extruding the polytetrafluoroethylene sealing ring through threads, and the top cover of the wax-proof viscosity reduction reaction kettle is fixed and sealed with the kettle body of the wax-proof viscosity reduction reaction kettle through a buckle. The top cover of the paraffin control viscosity reduction reaction kettle is also welded with a thermometer insert pipe for placing a thermometer for measuring the temperature of experimental liquid, and simultaneously welded with a cold water injection pipe and a cold water outlet pipe, wherein the cold water injection pipe extends into the bottom end of the paraffin tube, and the circulating water bath kettle pumps water with a certain temperature into the paraffin deposition pipe from the cold water injection pipe and pumps the water out from the cold water outlet pipe, so that the paraffin deposition pipe reaches a set temperature.
Preferably, the second cylinder 601 is made of quartz glass.
Example 4:
on the basis of any one of the above embodiments, the embodiment takes an unconventional wax inhibitor and viscosity reduction pour point depressant cleaning experiment in a gaseous state at normal pressure as an example for explanation, a valve between a medicament tank and a metering tank is opened, a medicament enters the metering tank from the medicament tank under the action of pressure difference, a nitrogen bottle is utilized to pressurize the metering tank, and the medicament is controlled to enter a wax dissolving and pour point reducing reaction kettle and a wax prevention and viscosity reduction reaction kettle from the metering tank in a liquid state according to a designed additive amount to participate in the experiment. In the experiment, certain pressure conditions in the corresponding reaction kettle are maintained, so that the medicament in the reaction kettle is always in a liquid state, and meanwhile, the medicament is fully contacted and fused with the oil liquid by using the corresponding magnetic stirrer.
Of course, if the experiment is carried out on the conventional liquid medicament, the liquid medicament which is metered by a beaker according to the designed dosage is directly added into the corresponding reaction kettle to participate in the experiment.
On the basis of the preparation, the embodiment can be used for separately carrying out a wax melting experiment, a condensation point test experiment, a viscosity test experiment and a wax precipitation experiment, and the specific method is as follows:
wax dissolution experiment: firstly, placing weighed wax balls on ball tracks in a wax dissolving and pour point depressing reaction kettle, adding a medicament dosage enough to submerge the wax balls into the wax dissolving and pour point depressing reaction kettle, the pressure of the wax-dissolving pour point depressing reaction kettle is higher than the saturated vapor pressure of the medicament under the experimental temperature condition by nitrogen pressurization, the medicament in the kettle is heated by a temperature control test box to reach the temperature condition required by the experiment, then the kettle body of the wax-dissolving and pour-point-reducing reaction kettle is rotated leftwards, the wax ball slides down to the kettle bottom along the ball track to participate in the experiment, rotating the rotary rod to a 90-degree position leftwards, horizontally fixing the kettle body of the wax dissolving and pour point depressing reaction kettle by using the pin, separating the wax ball and the medicament by using the filtering baffle, driving the waste liquid in the reaction kettle to a waste liquid tank by using nitrogen pressurization, taking out the wax ball after the pressure of the wax dissolving and pour point depressing reaction kettle is released, naturally drying the wax ball, weighing, and calculating the wax dissolving speed of the medicament through the mass loss of the wax ball before and after the experiment.
Condensation point test experiment: adding oil and a medicament into a wax-dissolving and pour point-reducing reaction kettle in proportion, pressurizing by nitrogen to enable the pressure of the wax-dissolving and pour point-reducing reaction kettle to be higher than the saturated vapor pressure of the medicament under the experimental temperature condition, controlling the temperature of liquid in the kettle to be reduced by a temperature control test box, driving a kettle body to rotate left by a rotary rod for 45 degrees or 90 degrees and keeping for a certain time when the temperature is reduced to one temperature measuring point, observing the flowing condition of a liquid surface, wherein the temperature when the liquid surface does not flow any more is the condensation point of a sample (the required inclination angle and the time for keeping the inclination are different in different condensation point test standards), and after the experiment is finished, pressurizing by nitrogen to drive the waste liquid in the reaction kettle to a waste liquid tank.
Viscosity test experiment: oil and medicament are added into the wax-proof viscosity reduction reaction kettle according to the proportion, the pressure of the wax-proof viscosity reduction reaction kettle is higher than the saturated vapor pressure of the medicament under the experimental temperature condition through nitrogen pressurization, liquid in the kettle is heated through the temperature control test box to reach the temperature condition required by the experiment, the viscosity data measured by the vibration viscometer 608 is collected and recorded by the data collection computer 8, and after the experiment is finished, the waste liquid in the reaction kettle is driven to the waste liquid tank through nitrogen pressurization.
Wax precipitation experiment: adding oil and a medicament into a wax-proof viscosity-reducing reaction kettle according to a proportion, pressurizing the pressure of the wax-proof viscosity-reducing reaction kettle to be higher than the saturated vapor pressure of the medicament under an experimental temperature condition through nitrogen, heating liquid in the kettle to reach the temperature condition required by the experiment through a temperature control test box, controlling the temperature of a wax deposition pipe in the reaction kettle by a circulating water bath kettle, condensing wax in crude oil on the surface of the wax deposition pipe under the action of temperature difference, pressurizing waste liquid in the reaction kettle to a waste liquid tank by using a nitrogen bottle after the experiment is finished, detaching the wax deposition pipe after the pressure of the wax-proof viscosity-reducing reaction kettle is relieved, weighing the wax deposition pipe after being naturally dried, and obtaining the wax deposition amount by the mass difference of the wax deposition pipe and the wax deposition pipe.
Example 5:
a multifunctional teaching experiment method is based on the multifunctional teaching experiment system in the application, takes unconventional clear paraffin inhibitor and viscosity-reducing pour point depressant dimethyl ether which are gaseous at normal pressure as medicaments, carries out the experiments of wax dissolution, pour point reduction, viscosity reduction and paraffin prevention of the dimethyl ether, and comprises the following detailed steps:
the method comprises the following steps: after the readings of a metering tank pressure gauge 27, a wax-dissolving pour point reducing reaction kettle pressure gauge 28, a wax-preventing and viscosity-reducing reaction kettle pressure gauge 29 and a waste liquid tank pressure gauge 30 are all zero after the pressure is released, all valves in the system are closed.
Step two: the medicine valve 14 is opened, the medicine enters the metering tank 3 under the pressure of the medicine tank, and the medicine valve 14 is closed after the medicine amount required by the experiment is added.
Step three: the pin is inserted into a corresponding pin hole at the position of 0 degree on the dial plate, so that the kettle body of the wax-dissolving pour point depressing reaction kettle 4 is vertically fixed.
Step four: weigh the wax ball by an initial weight, denoted as w0And wax balls are placed on ball tracks in the wax-dissolving pour point depressing reaction kettle 4, the top cover of the wax-dissolving pour point depressing reaction kettle 4 is covered and is fixedly sealed by a buckle, and a thermometer is placed in a thermometer inserting hole.
Step five: slowly opening an additive valve 17 of the wax-dissolving pour point depressing reaction kettle, slowly feeding the medicament into the wax-dissolving pour point depressing reaction kettle 4 under the pressure of the metering tank 3, and closing the additive valve 17 of the wax-dissolving pour point depressing reaction kettle after the dosage is enough to submerge the wax ball; adjusting a pressure reducing valve 12 and a pressure valve 16 of the wax-dissolving pour point depressing reaction kettle, observing the reading of a pressure gauge 28 of the wax-dissolving pour point depressing reaction kettle, pressurizing the wax-dissolving pour point depressing reaction kettle 4 to 1MPa (the saturated vapor pressure of dimethyl ether at 40 ℃ is 0.9MPa), and then closing the pressure valve 16 of the wax-dissolving pour point depressing reaction kettle.
Step six: setting the temperature of a temperature control test box 9 to be 40 ℃ for heating, checking a thermometer in a wax-dissolving and pour-point-reducing reaction kettle 4, pulling out a pin when the temperature of the medicine in the kettle reaches 40 ℃, rotating a rod leftwards, enabling a wax ball to slide into the medicine along a ball rail, recovering the vertical state of the kettle body and starting timing;
step seven: and stopping timing after the reaction time t, rotating a rotary rod leftwards, fixing the kettle body of the wax-dissolving and pour point depressing reaction kettle 4 in a horizontal state by using a pin, separating a wax ball from a medicament through a filtering baffle plate, stopping heating the temperature control test box 9, adjusting the pressure reducing valve 12 to enable the outlet pressure of nitrogen to be slightly greater than 1MPa, opening an inlet valve 26 of a waste liquid tank and a blow-off valve 20 of the wax-dissolving and pour point depressing reaction kettle, opening a pressurizing valve 16 of the wax-dissolving and pour point depressing reaction kettle, driving all waste liquid in the wax-dissolving and pour point depressing reaction kettle 4 into a waste liquid tank 11 through nitrogen, then closing the inlet valve 26 of the waste liquid tank, the blow-off valve 20 of the wax-dissolving and pour point depressing reaction kettle and the pressurizing valve 16 of the wax-dissolving and pour depressing reaction kettle 4, and recovering the vertical state of the kettle body of the wax-dissolving and pour point depressing reaction kettle 4.
Step eight: opening the pressure relief valve 19 of the wax-dissolving pour point depressing reaction kettle to relieve the pressure of the wax-dissolving pour point depressing reaction kettle 4, and closing the pressure relief valve 19 of the wax-dissolving pour point depressing reaction kettle until the number indicated by the pressure gauge 28 of the wax-dissolving pour point depressing reaction kettle is zero; opening the top cover of the wax dissolving and pour point depressing reaction kettle 4 and taking out wax balls, wherein the weight of the naturally aired wax balls is recorded as w, and then w0W is the dissolving amount of the medicament to the wax ball in t time at 40 ℃.
Step nine: a sufficient amount of X oil field high wax content thick oil which is solid at normal temperature is taken by a beaker and heated in a circulating water bath 10 to be liquid for standby.
Step ten: cleaning the wax-dissolving pour point depressing reaction kettle 4, adding a certain amount of crude oil obtained in the ninth step into the kettle, keeping the kettle body in a vertical state, covering a top cover of the wax-dissolving pour point depressing reaction kettle 4, fixedly sealing the top cover by using a buckle, and placing a thermometer into a corresponding thermometer insertion hole.
Step eleven: adjusting a pressure reducing valve 12 and a pressure valve 16 of the wax-dissolving pour point depressing reaction kettle, observing the reading of a pressure gauge 28 of the wax-dissolving pour point depressing reaction kettle, pressurizing the wax-dissolving pour point depressing reaction kettle 4 to 1MPa (the saturated vapor pressure of dimethyl ether at 40 ℃ is 0.9MPa), and then closing the pressure valve 16 of the wax-dissolving pour point depressing reaction kettle.
Step twelve: set up accuse temperature test box (9) temperature and heat for 40 ℃, guarantee that crude oil under the T temperature condition can flow, then, set up accuse temperature test box 9 cooling 1 ℃, look over and dissolve wax pour point depression reation kettle 4 mesometer, after the crude oil temperature reaches the set temperature in the cauldron, pull out the pin, slowly levogyration rotary rod, observe and dissolve the crude oil mobility in the wax pour point depression reation kettle, if the crude oil liquid level takes place to remove, then resume the vertical state of reation kettle cauldron body and continue cooling 1 ℃, until levogyration rotary rodRotating the rod to a horizontal state and keeping the rotating rod for 5s (refer to the inclined angle and the keeping time in the crude oil condensation point measuring method SY/T0541-2009 standard), and when the crude oil surface is not moved all the time, the temperature at the moment is recorded as the initial condensation point T of the crude oil1And simultaneously, the vertical state of the kettle body of the wax-dissolving pour point-reducing reaction kettle 4 is recovered.
Step thirteen: opening a pressure relief valve 19 of the wax-dissolving pour point depressing reaction kettle, observing a pressure gauge 28 of the wax-dissolving pour point depressing reaction kettle, and closing the pressure relief valve 19 of the wax-dissolving pour point depressing reaction kettle after the pressure of the wax-dissolving pour point depressing reaction kettle 4 is relieved to zero; and slowly opening the solvent adding valve 17 of the wax-dissolving pour point depressing reaction kettle, slowly allowing the solvent to enter the wax-dissolving pour point depressing reaction kettle 4 under the pressure of the metering tank 3, closing the solvent adding valve 17 of the wax-dissolving pour point depressing reaction kettle when the solvent amount reaches 1% of the volume ratio, and repeating the eleventh step.
Fourteen steps: stirring with magnetic stirrer for 5min to mix the medicinal preparation with oil, and repeating the step twelve to obtain crude oil with solidifying point T when the volume of the medicinal preparation is 1%2。
Step fifteen: adjusting the pressure reducing valve 12 to enable the pressure of the nitrogen outlet to be slightly larger than the value of a waste liquid tank pressure gauge 30 at the moment, opening the inlet valve 26 of the waste liquid tank, the blow-down valve 20 of the wax-dissolving pour point depressing reaction kettle, opening the pressurizing valve 16 of the wax-dissolving pour point depressing reaction kettle, driving all waste liquid in the wax-dissolving pour point depressing reaction kettle 4 into the waste liquid tank 11 through nitrogen, and then closing the inlet valve 26 of the waste liquid tank, the blow-down valve 20 of the wax-dissolving pour point depressing reaction kettle and the pressurizing valve 16 of the wax-dissolving pour point depressing reaction kettle.
Sixthly, the steps are as follows: weigh the initial weight of the wax tubing, denoted m0。
Seventeen steps: adding a certain amount of crude oil obtained in the ninth step into the paraffin control and viscosity reduction reaction kettle 6; a vibration viscometer and a wax deposition pipe are arranged on the top cover of the wax-proof viscosity-reducing reaction kettle 6, a thermometer is placed in a thermometer insertion pipe, and the top cover and the circulating water bath kettle 10 are connected; and starting the data acquisition computer 4 and the viscosity data acquisition software.
Eighteen steps: the temperature of the temperature control test chamber 9 is set to 40 ℃.
Nineteen steps: checking a thermometer in the paraffin control and viscosity reduction reaction kettle 6, covering a top cover of the paraffin control and viscosity reduction reaction kettle 6 after the temperature of oil liquid reaches 40 ℃, and fixing and sealing by using a buckle; adjusting a pressure reducing valve 12 and a pressure valve 21 of the wax-proof viscosity-reducing reaction kettle, observing the reading of a pressure meter 29 of the wax-proof viscosity-reducing reaction kettle, pressurizing the wax-proof viscosity-reducing reaction kettle 6 to 1MPa (the saturated vapor pressure of dimethyl ether at 40 ℃ is 0.9MPa), and then closing the pressure valve 21 of the wax-proof viscosity-reducing reaction kettle.
Twenty steps: starting experiment timing, simultaneously starting viscosity data acquisition by the vibration viscometer, stopping data acquisition after the viscosity data is stable, ending viscosity test, and obtaining stable viscosity data mu0The viscosity of the blank oil at 40 ℃ is recorded.
Twenty one: after the experiment timing is 30min, adjusting the pressure reducing valve 12 to enable the pressure of a nitrogen outlet to be slightly greater than 1MPa, opening an inlet valve 26 of the waste liquid tank and a blowdown valve 24 of the wax-proof viscosity reduction reaction kettle, opening a pressurization valve 21 of the wax-proof viscosity reduction reaction kettle, driving all waste liquid in the wax-proof viscosity reduction reaction kettle 6 into the waste liquid tank 11 through nitrogen, and then closing the inlet valve 26 of the waste liquid tank, the blowdown valve 24 of the wax-proof viscosity reduction reaction kettle and the pressurization valve 21 of the wax-proof viscosity reduction reaction kettle.
Step twenty-two: opening the pressure relief valve 22 of the paraffin control and viscosity reduction reaction kettle to relieve the pressure of the paraffin control and viscosity reduction reaction kettle 6, and closing the pressure relief valve 22 of the paraffin control and viscosity reduction reaction kettle until the number indicated by the pressure gauge 29 of the paraffin control and viscosity reduction reaction kettle is zero; closing the circulating water bath kettle 10, opening the top cover of the paraffin control viscosity reduction reaction kettle 6, inversely detaching the paraffin precipitation pipe, and recording the weight of the naturally dried paraffin precipitation pipe as m, wherein m is the number m-m0Namely the wax precipitation amount of the blank oil liquid at 40 ℃.
Twenty-three steps: cleaning and airing the wax precipitation pipe, the vibration viscometer and the thermometer insertion pipe, installing the vibration viscometer and the wax precipitation pipe on the top cover of the reaction kettle, and inserting the thermometer; adding crude oil which is the same as the crude oil in the seventeen steps into the wax-proof viscosity-reducing reaction kettle 6; setting the temperature of a temperature control test box 9 to be 40 ℃ to heat oil in the paraffin control and viscosity reduction reaction kettle 6; the circulating water bath 10 is started, and the wax deposition pipe is heated at the set temperature of 30 ℃.
Twenty-four steps: checking a thermometer in the paraffin control and viscosity reduction reaction kettle 6, covering a top cover of the paraffin control and viscosity reduction reaction kettle 6 after the temperature of oil liquid reaches 40 ℃, and fixing and sealing by using a buckle; slowly opening the agent adding valve 23 of the paraffin-control viscosity-reducing reaction kettle, slowly allowing the agent to enter the paraffin-control viscosity-reducing reaction kettle 6 under the pressure of the metering tank 3, and closing the agent adding valve 23 of the paraffin-control viscosity-reducing reaction kettle when the adding amount of the agent reaches 1% of the volume ratio; adjusting a pressure reducing valve 12 and a pressure valve 21 of the wax-proof viscosity-reducing reaction kettle, observing the reading of a pressure meter 29 of the wax-proof viscosity-reducing reaction kettle, pressurizing the wax-proof viscosity-reducing reaction kettle 6 to 1MPa (the saturated vapor pressure of dimethyl ether at 40 ℃ is 0.9MPa), and then closing the pressure valve 21 of the wax-proof viscosity-reducing reaction kettle.
Twenty-five steps: starting a magnetic stirrer to stir for 5min, and starting experiment timing after the medicine and the oil liquid are fully mixed; and operating the software to start viscosity data acquisition, stopping the data acquisition after the viscosity data is stable, ending the viscosity test, and recording the obtained stable viscosity data mu as the viscosity of the additive oil liquid at 40 ℃.
Twenty-six steps: repeating the twenty-one step and the twenty-two step to obtain the paraffin tube with the weight of m 'after the paraffin tube is naturally aired, wherein m' -m0Namely the wax precipitation amount of the additive oil liquid at 40 ℃.
Twenty-seven steps: and (5) after the experiment is finished, cleaning instrument equipment.
In the above experimental steps, the third to eighth steps are wax dissolution experiments, the ninth to fifteenth steps are pour point depression experiments, and the sixteenth to twenty-sixth steps are viscosity depression experiments and wax prevention experiments.
The obtained experimental data are utilized to calculate the wax dissolving rate of the dimethyl ether which is in a gas state under normal pressure at the temperature of 40 ℃, and the pour point depressing rate, the viscosity reducing rate and the wax prevention rate of the dimethyl ether at the volume additive amount of 1 percent and the oil temperature of 40 ℃ to the high wax-containing heavy oil in the X oil field are respectively as follows:
wax dissolution rate (g/min):
pour point depression (%):
viscosity reduction rate (%):
wax control ratio (%):
the above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Further, the term "connected" used herein may be directly connected or indirectly connected via other components without being particularly described.
Claims (10)
1. The multifunctional teaching experiment system for the under-pressure measurement in the petroleum field is characterized by comprising a nitrogen cylinder (1), a medicament tank (2), a metering tank (3), a wax-dissolving pour point depressing reaction kettle (4), a wax-preventing viscosity-reducing reaction kettle (6) and a waste liquid tank (11), wherein the wax-dissolving pour point depressing reaction kettle (4) and the wax-preventing viscosity-reducing reaction kettle (6) are both positioned in a temperature control test box (9);
the nitrogen cylinder (1) is used for pressurizing the metering tank (3), the wax-dissolving and pour-point-reducing reaction kettle (4) and the wax-preventing and viscosity-reducing reaction kettle (6);
the medicament tank (2) is used for providing medicament for the metering tank (3);
the metering tank (3) is used for providing medicaments for the wax-dissolving pour point-reducing reaction kettle (4) and the wax-preventing and viscosity-reducing reaction kettle (6);
the waste liquid tank (11) is used for recovering waste liquid of the wax-dissolving pour point-reducing reaction kettle (4) and the wax-preventing and viscosity-reducing reaction kettle (6);
the wax dissolving and pour point depressing reaction kettle (4) is used for measuring the wax dissolving rate and pour point depressing rate of the medicament;
the wax-proof viscosity-reducing reaction kettle (6) is used for measuring the wax-proof rate and the viscosity-reducing rate of the medicament.
2. The multifunctional teaching experiment system for measuring pressure in petroleum field according to claim 1,
the output end of the nitrogen cylinder (1) is sequentially provided with a pressure reducing valve (12) and a safety valve (13);
a metering tank pressurization valve (15) is arranged between the safety valve (13) and the metering tank (3);
a wax-dissolving pour point depressing reaction kettle pressurizing valve (16) is arranged between the safety valve (13) and the wax-dissolving pour point depressing reaction kettle (4);
and a wax-proof viscosity-reducing reaction kettle pressurizing valve (21) is arranged between the safety valve (13) and the wax-proof viscosity-reducing reaction kettle (6).
3. The multifunctional teaching experiment system for measuring pressure in petroleum field according to claim 1,
a medicament valve (14) is arranged between the medicament tank (2) and the metering tank (3);
an additive valve (17) of the wax-dissolving pour point depressing reaction kettle is arranged between the metering tank (3) and the wax-dissolving pour point depressing reaction kettle (4), and an additive valve (23) of the wax-preventing viscosity-reducing reaction kettle is arranged between the metering tank (3) and the wax-preventing viscosity-reducing reaction kettle (6);
a wax-dissolving pour point depressing reaction kettle blow-down valve (20) is arranged between the wax-dissolving pour point depressing reaction kettle (4) and the waste liquid tank (11), and a wax-preventing viscosity-reducing reaction kettle blow-down valve (24) is arranged between the wax-preventing viscosity-reducing reaction kettle (6) and the waste liquid tank (11);
the device also comprises a wax-dissolving and pour-point-reducing reaction kettle pressure release valve (19), a wax-preventing and viscosity-reducing reaction kettle pressure release valve (22) and a waste liquid tank pressure release valve (25) which are respectively used for releasing pressure for the wax-dissolving and pour-point-reducing reaction kettle (4), the wax-preventing and viscosity-reducing reaction kettle (6) and the waste liquid tank (11).
4. The multifunctional teaching experiment system for measuring pressure in petroleum field according to claim 2,
transparent parts for observation are arranged on the surfaces of the metering tank (3), the wax-dissolving pour point-reducing reaction kettle (4) and the wax-preventing and viscosity-reducing reaction kettle (6); the wax-dissolving pour point-reducing reaction kettle (4) and the wax-preventing and viscosity-reducing reaction kettle (6) are both provided with stirring devices;
a metering tank pressure gauge (27) for monitoring the pressure in the metering tank (3) is arranged at the downstream end of the metering tank pressurization valve (15);
the downstream end of the pressure valve (16) of the wax-dissolving pour point depressing reaction kettle is provided with a wax-dissolving pour point depressing reaction kettle pressure gauge (28) for monitoring the pressure in the wax-dissolving pour point depressing reaction kettle (4);
the downstream end of the wax-proof viscosity-reducing reaction kettle pressurizing valve (21) is provided with a wax-proof viscosity-reducing reaction kettle pressure gauge (29) for monitoring the pressure in the wax-proof viscosity-reducing reaction kettle (6);
and a waste liquid tank pressure gauge (30) for monitoring the pressure in the waste liquid tank (11).
5. The multifunctional teaching experiment system for measuring pressure in the petroleum field according to any one of claims 1 to 4, wherein the wax-dissolving pour-point depressing reaction kettle (4) comprises a first cylinder wall (401), a first upper end cover (402) and a first lower end cover (403) which are respectively connected with two ends of the first cylinder wall (401) in a sealing manner, and a first top cover (405) which is matched with the first upper end cover (402) in a sealing manner, wherein the first top cover (405) is detachably connected with the first upper end cover (402) through a first buckle (404);
a first channel (406) for adding agent, pressurizing and decompressing is formed in the first upper end cover (402), and a first liquid discharge port (407) for discharging liquid is formed in the first lower end cover (403);
the inner wall of the first upper end cover (402) is also fixedly connected with a ball track (408) for placing wax balls, and the ball track (408) gradually inclines upwards from one end close to the inner wall of the first upper end cover (402) to one end far away from the inner wall of the first upper end cover (402);
the filter device further comprises a filter baffle (409) fixed at the top of the first lower end cover (403), the interior of the first cylinder wall (401) is divided into two parts by the filter baffle (409), and the first liquid discharge port (407) and the ball track (408) are respectively positioned at two sides of the filter baffle (409);
the wax melting and pour point depressing reaction kettle also comprises an angle adjusting mechanism for inclining the wax melting and pour point depressing reaction kettle (4).
6. The multifunctional teaching experiment system for measuring pressure in petroleum field according to claim 5,
the first upper end cover (402) and the first lower end cover (403) are fixedly connected through a first bolt (410);
a first thermometer insertion tube (411) inserted into the first cylinder wall (401) is arranged on the first top cover (405);
the top end of the filtering baffle (409) is higher than the ball rail (408), and the top end of the filtering baffle (409) is provided with a limiting mechanism for preventing the dissolved wax ball residues from moving to the other side of the filtering baffle (409).
7. The multifunctional teaching experiment system for measuring pressure in petroleum field according to claim 5, wherein the angle adjusting mechanism comprises a dial (412) and a rotating rod (413), the lower end of the rotating rod (413) is hinged with the dial (412), and the upper end of the rotating rod (413) is connected with a handle (414); the rotating rod (413) is fixedly connected with the wax dissolving and pour point depressing reaction kettle (4), and the axis of the rotating rod (413) is parallel to and coplanar with the axis of the wax dissolving and pour point depressing reaction kettle (4); have the angle scale on the calibrated scale (412), and on calibrated scale (412) along a plurality of first pinhole (415) of circumference equipartition, set up on rotary rod (413) with first pinhole (415) assorted second pinhole (416).
8. The multifunctional teaching experiment system for measuring pressure in the petroleum field according to any one of claims 1 to 4, wherein the paraffin control and viscosity reduction reaction kettle (6) comprises a second cylinder wall (601), a second upper end cover (602) and a second lower end cover (603) which are respectively connected to two ends of the second cylinder wall (601) in a sealing manner, and a second top cover (604) which is matched with the second upper end cover (602) in a sealing manner, wherein the second top cover (604) is detachably connected with the second upper end cover (602) through a second buckle (605);
a second channel (606) for adding agent, pressurizing and decompressing is formed in the second upper end cover (602), and a second liquid discharge port (607) for discharging liquid is formed in the second lower end cover (603);
connect vibration viscometer (608), second thermometer insert tube (609), wax deposition pipe (610) on second top cap (604), wax deposition pipe (610) and circulating water bath (10) intercommunication.
9. The multifunctional teaching experiment system for measuring pressure in petroleum field according to claim 8, further comprising a sealing cover (611), wherein the bottom of the second top cover (604) is provided with a mounting head (617) extending along the axial direction, and the sealing cover (611) is in threaded connection with the mounting head (617); a through hole (612) for a wax deposition pipe (610) to pass through is formed in the bottom of the sealing cover (611), a step surface is formed between the outer wall of the through hole (612) and the inner wall of the sealing cover (611), a seat hanging part (613) extending out in the radial direction is arranged at the top of the wax deposition pipe (610), and the wax deposition pipe (610) is hung on the step surface through the seat hanging part (613); gaskets (614) are arranged between the seat hanging part (613) and the step surface and between the seat hanging part (613) and the mounting head (617); the wax-removing device is characterized by further comprising a cold water injection pipe (615) and a cold water outlet pipe (616) which penetrate through the second top cover (604), wherein the cold water injection pipe (615) extends into the bottom end of the wax-forming pipe (610), the cold water outlet pipe (616) extends into the mounting head (617), and cold water enters the cold water injection pipe (615) from the circulating water bath kettle (10) and flows back to the circulating water bath kettle (10) from the cold water outlet pipe (616).
10. An experimental method of the multifunctional teaching experimental system for measuring pressure in the petroleum field based on any one of claims 1 to 9 is characterized by comprising the following steps:
s1, releasing pressure of the metering tank (3), the wax-dissolving and pour-point-reducing reaction kettle (4), the wax-preventing and viscosity-reducing reaction kettle (6) and the waste liquid tank (11), and stopping all valves in the teaching experiment system after pressure release is finished;
s2, enabling a sufficient amount of medicine to enter the metering tank (3) from the medicine tank (2);
s3, carrying out a wax dissolving experiment through a wax dissolving and pour point depressing reaction kettle (4), in the experiment process, providing a medicament through a metering tank (3), pressurizing through a nitrogen bottle (1), adjusting the temperature through a temperature control test box (9), and recycling waste liquid through a waste liquid tank (11);
s4, carrying out a condensation point test experiment through a wax-dissolving and pour point-reducing reaction kettle (4), in the experiment process, providing a medicament through a metering tank (3), pressurizing through a nitrogen bottle (1), adjusting the temperature through a temperature control test box (9), and recycling waste liquid through a waste liquid tank (11);
s5, performing a viscosity test experiment and a wax precipitation experiment through the wax-proof viscosity reduction reaction kettle (6), providing a medicament through the metering tank (3), pressurizing through the nitrogen cylinder (1), adjusting the oil temperature through the temperature control test box (9), and recovering waste liquid through the waste liquid tank (11) in the experiment process.
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