Crude oil mixing unit testing system

Abstract

The invention provides a crude oil mixing unit test system which comprises a crude oil conveying unit, a tested unit and a detection unit, and the tested unit comprises a plurality of test lines. The plurality of test lines comprise a single static mixer test line, a static mixer and mixing valve combined test line and a single mixing valve test line, and the parallel test pipelines are arranged in the mixing test system, so that the particle size distribution of crude oil before and after mixing can be conveniently, directly and efficiently detected, the mixer does not need to be replaced, and the cost is reduced. Experiments can be conveniently carried out only by adjusting pipelines of different flow channels, the particle size effect of mixing can be monitored in real time, the best working pressure threshold value can be obtained through experiments according to the differential pressure gauge, and a subsequent mixing unit can be well applied in the industry conveniently.

Description

Technical Field

[0001] The present invention belongs to the technical field of crude oil mixing tests, and particularly relates to a crude oil mixing unit test system. Background Art

[0002] In the process of crude oil extraction and processing, laboratory-scale crude oil mixing test equipment is often used to study the effect of demulsifiers, mixing uniformity, and optimization of subsequent processing technologies. Traditional crude oil mixing test devices usually adopt static mixers or mechanical stirring mixers, and rely on external valves and flow control devices to adjust the feeding ratio of crude oil and demulsifiers.

[0003] Existing laboratory crude oil mixing test equipment usually adopts a mixing cavity with a fixed structure, and the size of its feeding port cannot be adjusted, resulting in difficulty in achieving rapid and accurate flow matching when crude oil with different viscosities or flow rates enters the mixer; especially during the experiment, if it is necessary to adjust the mixing ratio of crude oil and demulsifier, it is usually necessary to frequently adjust external valves or replace feeding pipelines, which is not only cumbersome to operate, but also affects the mixing efficiency due to the lag of valve response, resulting in deviation of experimental data; in addition, due to the lack of a dynamic adjustment mechanism inside the mixing cavity, the mixing is insufficient at low flow rates, and turbulence or local pressure fluctuations may occur at high flow rates, further reducing the mixing uniformity and affecting the reliability of experimental results.

[0004] Moreover, most of the existing detection systems can only detect one type of mixing equipment. Most of them collect crude oil at the rear liquid outlet and then put it into a special instrument for detection. Such a form not only takes a very long time for experimental detection, but also requires installing various comparison mixing devices to improve the experimental variables in order to enhance the comparison effect, thus increasing the experimental cost and the time spent on the experiment.

[0005] Therefore, there is a need for a crude oil mixing test equipment that can dynamically adjust the size of the feeding port to solve the problems of inflexible adjustment of mixing ratio, slow response speed, and unstable mixing effect in the prior art. Summary of the Invention

[0006] The object of the present invention is to solve the deficiencies of the above prior art and provide a crude oil mixing unit test system. The mixing unit test system includes a crude oil transportation unit, a unit to be tested, and a detection unit. The crude oil transportation unit includes a crude oil storage tank, a crude oil metering pump, a safety valve, a regulating valve, and an on-line flowmeter. The unit to be tested includes several test lines. The several test lines include a single static mixer test line, a static mixer and mixing valve combination test line, and a single mixing valve test line. The several test lines are in a parallel mode. Differential pressure gauges are provided at both ends of the unit to be tested. The detection unit includes an on-line particle size analyzer and a probe. The probe includes a front-end probe and a rear-end probe. The front-end probe and the rear-end probe are respectively arranged outside the front and rear ends of the unit to be tested. The front-end probe and the rear-end probe are connected to the on-line particle size analyzer through a line. The crude oil transportation unit controls the flow rate through the crude oil metering pump and the regulating valve. The flow rate in the pipeline of the crude oil transportation unit is 1.5 - 2.5 m / s. The pressure difference of the single static mixer test line is 30 - 50 kPa. The pressure difference of the static mixer and mixing valve combination test line is 30 - 150 kPa. The pressure difference of the single mixing valve test line is 30 - 120 kPa. The inner diameter size range of the static mixer of the single static mixer test line is 100 mm - 300 mm. The particle size analyzer has two probes, which are respectively arranged outside the front and rear ends of the unit to be tested. By setting parallel test pipelines in the mixing test system, the setting of three different mixers can be realized, which can facilitate the direct and efficient detection of the particle size distribution of crude oil before and after mixing, so as to detect the different mixing effects that can be actually achieved by different mixers. Moreover, there is no need to replace the mixer, and the experiment can be conveniently carried out only by adjusting the pipelines of different flow channels. The on-line particle size analyzer and differential pressure gauge arranged outside the parallel test pipelines can not only monitor the particle size effect of mixing in real time, but also experiment the best working pressure threshold according to the differential pressure gauge, which is convenient for having an efficient production parameter during subsequent mass production.

[0007] The static mixing port includes a mixer and a drainage cover. The mixer is cylindrical, and a mixing chamber is formed inside the mixer. A telescopic part penetrating through to the mixing chamber is installed on the outer peripheral surface of the mixer. There are 4 telescopic parts. A shutter is movably installed inside the telescopic part. A transmission device is also installed inside the telescopic part. The shutter moves up and down inside the telescopic part driven by the transmission device. One end of the drainage cover is fitted and installed with the inner wall of the mixer, and the other end of the drainage cover is fitted and installed with the shutter. The material of the drainage cover is a flexible material. A control device is installed on the upper part of the mixer. The transmission devices are all electrically connected to the control device. The material of the drainage cover is rubber. The transmission device includes a friction rod and a motor. The motor drives the friction rod to move up and down. Through the coordinated operation of the adjustable telescopic part and the shutter, it can respond to the changes in crude oil flow rate and pressure in real time and quickly. The structure is simpler and the adjustment speed is faster. Through the setting of the drainage cover, the mixer can not only adjust the flow rate inside, but also adjust the pressure, with a faster response and better effect.

[0008] Compared with the prior art, the beneficial effects of the present invention are:

[0009] By setting parallel test pipelines in the mixing test system, three different mixers can be set up, which is convenient for directly and efficiently detecting the particle size distribution of crude oil before and after mixing, so as to detect the different mixing effects that different mixers can actually achieve. And it is not necessary to replace the mixer. Just adjusting the pipelines of different flow channels can conveniently conduct experiments. The online particle size analyzer and differential pressure gauge set outside the parallel test pipelines can not only monitor the particle size effect of mixing in real time, but also experiment with the best working pressure threshold according to the differential pressure gauge, which is convenient for having an efficient production parameter during subsequent mass production.

[0010] Through the coordinated operation of the adjustable telescopic part and the shutter, it can respond to the changes in crude oil flow rate and pressure in real time and quickly. The structure is simpler and the adjustment speed is faster. Through the setting of the drainage cover, the mixer can not only adjust the flow rate inside, but also adjust the pressure, with a faster response and better effect. Description of the Drawings

[0011] Figure 1 is a pipeline schematic diagram of a crude oil mixing unit test system;

[0012] Figure 2 is a cross-sectional schematic diagram of the static mixing port of a crude oil mixing unit test system;

[0013] In the figure: 1. Crude oil storage tank; 2. Liquid injection port; 3. Crude oil metering pump; 4. Front-end probe; 5. Rear-end probe; 6. Online flowmeter; 7. Single static mixer test line; 8. Static mixer and mixing valve combination test line; 9. Single mixing valve test line; 10. Static mixing port; 11. Mixing valve; 12. Online particle size analyzer; 13. Differential pressure gauge; 14. Mixing chamber; 15. Mixer; 16. Control device; 17. Drainage hood; 18. Baffle; 19. Telescopic part. Specific implementation mode

[0014] To deepen the understanding of the present invention, the present invention will be further described in detail below in combination with embodiments and drawings. The embodiments are only used to explain the present invention and do not limit the protection scope of the present invention.

[0015] Crude oil storage tank 1, liquid injection port 2, crude oil metering pump 3, front-end probe 4, rear-end probe 5, online flowmeter 6, single static mixer test line 7, static mixer and mixing valve combination test line 8, single mixing valve test line 9, static mixing port 10, mixing valve 11, online particle size analyzer 12, differential pressure gauge 13, mixing chamber 14, mixer 15, control device 16, drainage hood 17, baffle 18, telescopic part 19.

[0016] An oil mixing unit test system, the mixing unit test system includes a crude oil delivery unit, a unit under test, and a detection unit. The crude oil delivery unit includes a crude oil storage tank 1, a crude oil metering pump 3, a safety valve, a regulating valve, and an on-line flowmeter 6. The unit under test includes several test lines. The several test lines include a single static mixer test line 7, a static mixer and mixing valve combination test line 8, and a single mixing valve 11 test line 9. The several test lines are in a parallel mode. Differential pressure gauges 13 are provided at both ends of the unit under test. The detection unit includes an on-line particle size analyzer 12 and a probe. The probe includes a front-end probe 4 and a rear-end probe 5. The front-end probe 4 and the rear-end probe 5 are respectively arranged outside the front and rear ends of the unit under test. The front-end probe 4 and the rear-end probe 5 are connected to the on-line particle size analyzer 12 through a line. The crude oil delivery unit controls the flow rate through the crude oil metering pump 3 and the regulating valve. The flow rate in the pipeline of the crude oil delivery unit is 1.5 - 2.5 m / s. The pressure difference of the single static mixer test line 7 is 30 - 50 kPa. The pressure difference of the static mixer and mixing valve combination test line 8 is 30 - 150 kPa. The pressure difference of the single mixing valve 11 test line 9 is 30 - 120 kPa. The inner diameter size range of the static mixer of the single static mixer test line 7 is 100 mm - 300 mm. The particle size analyzer has two probes, which are respectively arranged outside the front and rear ends of the unit under test. By setting parallel test pipelines in the mixing test system, the setting of three different mixers is realized. The static mixing port 10 includes a mixer and a drainage cover. The mixer is cylindrical. A mixing chamber is formed inside the mixer. A telescopic part penetrating through to the mixing chamber is installed on the outer peripheral surface of the mixer. There are 4 telescopic parts. A baffle is movably installed inside the telescopic part. A transmission device is also installed inside the telescopic part. The baffle moves up and down inside the telescopic part driven by the transmission device. One end of the drainage cover is fitted and installed with the inner wall of the mixer. The other end of the drainage cover is fitted and installed with the baffle. The material of the drainage cover is a flexible material. A control device is installed on the upper part of the mixer. The transmission devices are all electrically connected to the control device. The material of the drainage cover is rubber. The transmission device includes a friction rod and a motor. The motor drives the friction rod to move up and down

[0017] Implementation example

[0018] During use, crude oil and demulsifier are input into the interior of the test unit through the crude oil storage tank 1 and the liquid injection port 2 by means of the crude oil metering pump 3. Before entering the test unit, the particle size analysis inside the crude oil and the incoming flow rate are detected through the front-end probe 4 and the online flowmeter 6. Then, according to different requirements, it enters different single static mixer test lines 7, static mixer and mixing valve combination test lines 8, and single mixing valve test lines 9, and mixes the crude oil in three different forms: a single static mixing port 10, a combination of the static mixing port 10 and the mixing valve 11, and a single mixing valve 11. After mixing, it is exported from the rear-end probe 5. The front-end probe 4 and the rear-end probe 5 are used to compare and analyze the particle size distribution inside the crude oil before and after. In addition, the differential pressure gauge 13 is used to measure the pressure difference at the inlet and outlet of both ends of the overall parallel test pipeline during mixing, so as to calculate which one can obtain the best mixed particle size effect among different demulsifier contents, flow rates, pressures, and different mixing devices of the crude oil.

[0019] Inside the static mixing port, the crude oil and the mixture enter from the left side of the mixing chamber, pass through the drainage cover and enter the mixing chamber, and flow out from the left side of the mixing chamber after reaction. As shown in the figure, this state is when the drainage cover and the baffle are fully closed, and at this time, the crude oil and the mixture do not enter the mixing chamber 5. This state is when the drainage cover and the baffle are semi-closed, and at this time, the crude oil and the mixture enter the mixing chamber, and the incoming flow rate and pressure are half of those when fully open. Compared with directly setting a valve in front of the mixer in the prior art, this integrated structure allows the pressure and flow rate inside the container to be adjusted more quickly, and at the same time, a better mixing effect is achieved through this structure.

[0020] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the purpose and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A crude oil mixing unit test system, characterized in that the mixing unit test system includes a crude oil transportation unit, a unit to be tested, and a detection unit. The crude oil transportation unit includes a crude oil storage tank, a crude oil metering pump, a safety valve, a regulating valve, and an on-line flowmeter. The unit to be tested includes several test lines, and the several test lines include a single static mixer test line, a static mixer and mixing valve combination test line, and a single mixing valve test line. The several test lines are in a parallel mode. Differential pressure gauges are provided at both ends of the unit to be tested. The detection unit includes an on-line particle size analyzer and a probe. The probe includes a front-end probe and a rear-end probe. The front-end probe and the rear-end probe are respectively arranged on the outer sides of the front and rear ends of the unit to be tested. The front-end probe and the rear-end probe are connected to the on-line particle size analyzer through a line.

2. The crude oil mixing unit test system according to claim 1, wherein, The crude oil transportation unit controls the flow rate through the crude oil metering pump and the regulating valve, and the flow rate in the pipeline of the crude oil transportation unit is 1.5 - 2.5 m / s.

3. The crude oil mixing unit test system according to claim 1, wherein The pressure difference of the single static mixer test line is 30 - 50 kPa, the pressure difference of the static mixer and mixing valve combination test line is 30 - 150 kPa, and the pressure difference of the single mixing valve test line is 30 - 120 kPa.

4. The crude oil mixing unit test system according to claim 1, wherein, The inner diameter size range of the static mixer of the single static mixer test line is 100 mm - 300 mm.

5. A crude oil mixing unit test system according to claim 1, characterized in that The on-line particle size analyzer is provided with two probes, which are respectively arranged on the outer sides of the front and rear ends of the unit to be tested.

6. The crude oil mixing unit test system according to claim 1, wherein The static mixing port includes a mixer and a drainage cover. The mixer is cylindrical, and a mixing chamber is formed inside the mixer. The outer peripheral surface of the mixer is provided with 4 telescopic parts that penetrate through to the mixing chamber. A baffle is movably installed inside the telescopic parts, and a transmission device is also installed inside the telescopic parts. The baffle moves up and down inside the telescopic parts driven by the transmission device. One end of the drainage cover is fitted and installed with the inner wall of the mixer, and the other end of the drainage cover is fitted and installed with the baffle. The material of the drainage cover is a flexible material.

7. A crude oil mixing unit test system according to claim 6, characterized in that, A control device is installed on the upper part of the mixer, and the transmission devices are all electrically connected to the control device.

8. A crude oil mixing unit test system according to claim 6, characterized in that, The material of the drainage cover is rubber.

9. The crude oil mixing unit test system according to claim 6, characterized in that, The transmission device includes a friction rod and a motor, and the motor drives the friction rod to move up and down.

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