Evaluation system and method for effect of demulsifier

Abstract

The invention discloses a demulsifier effect evaluation system and method, and belongs to the technical field of industrial equipment. The demulsifier effect evaluation system comprises a thermostatic bath, an oil-water emulsion bottle, a heater, a viscosity sensor, a data analysis system and a data display system. According to the method, the dehydration condition is judged by measuring the viscosity value of a mixture of crude oil and water after the demulsifier is added, namely, the actual heights of the current water area, the current oil-water emulsion area and the current oil area are determined according to the typical viscosity, Hmax and viscosity data of the water area, the oil-water emulsion area and the oil area; and subsequently, the dehydration height is accurately calculated by transmitting the signal to the module through a signal receiving device, and is displayed on a liquid crystal panel, so that the error of reading observed by naked eyes is avoided. And methyl silicone oil can be adopted as a heating medium, so that the practical application environment can be simulated, and the model selection result of the demulsifier is more accurate.

Description

Technical Field

[0001] This invention belongs to the field of industrial equipment technology, and specifically relates to a demulsifier effect evaluation system and method. Background Technology

[0002] The information disclosed in this background section is intended only to enhance understanding of the overall background of the invention and is not necessarily to be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art.

[0003] Against the backdrop of global oil and gas resource development, imported crude oil supply fluctuates frequently, and the proportion of high-density, high-salinity crude oil continues to rise. This type of crude oil has a complex composition and high stability, significantly increasing the difficulty of demulsification and dehydration during extraction, transportation, and processing, posing a serious challenge to subsequent processing. Efficient demulsification and dehydration are key to crude oil pretreatment, and the precise selection of demulsifiers is crucial for this.

[0004] Currently, the screening process for demulsifiers is cumbersome, relying on bottle testing and on-site pilot-scale testing. Traditional bottle testing methods typically involve manually or mechanically shaking the dehydrated bottle containing the oil sample and demulsifier, then placing it in a constant-temperature water bath to allow it to settle. Researchers must repeatedly remove the bottle from the water bath to manually observe and record the amount of dehydration, the oil-water interface morphology, and the water color. This process is not only time-consuming and labor-intensive, but the frequent removal and placement also causes fluctuations in the temperature field inside the bottle, severely affecting the stability of experimental conditions and the accuracy and reliability of the results. It is particularly noteworthy that current water bath devices are limited by the boiling point of water, with a maximum operating temperature typically around 80℃, far below the 125-140℃ high-temperature conditions commonly encountered in actual production. This results in significant deviations in the performance evaluation of demulsifiers screened at this temperature in practical applications. Existing technology provides a visual demulsifier evaluation device that enables observation in a water bath, avoiding frequent bottle removal and reducing the risk of burns. However, this method still has significant limitations: First, the adhesion (wall-hanging) of crude oil to the bottle wall during dehydration is not effectively overcome, affecting the accurate measurement of dehydration volume (height); second, it still mainly relies on visual observation, and the readings are easily affected by subjective factors, resulting in insufficient accuracy; third, the core problem—that water bath heating cannot simulate the high temperatures of actual working conditions (limited to below 80℃)—remains unresolved, which directly affects the accuracy of demulsifier selection in actual high-temperature environments.

[0005] Therefore, there is an urgent need for a new demulsifier evaluation device and method that can operate at near-real-world high temperatures, overcome the effects of wall adhesion, and achieve automated, precise, and non-invasive measurement of key dehydration parameters (such as dehydration height). Summary of the Invention

[0006] To address the shortcomings of existing technologies, the present invention aims to provide a demulsifier effectiveness evaluation system and method. The system provided by this invention can monitor the dehydration process in real time and accurately, avoiding the errors and inconveniences caused by frequent manual operations in traditional methods. Furthermore, the system can use dimethyl silicone oil or similar materials as a heating medium, with a heating temperature of 150-220℃, fully covering the actual application temperature of the demulsifier and ensuring the accuracy of demulsifier selection.

[0007] To achieve the above objectives, the technical solution of the present invention is as follows: In a first aspect, the present invention provides a demulsifier effect evaluation system, comprising: a constant temperature bath, an oil-water emulsion bottle, a heater, a viscosity sensor, a data analysis system, and a data display system; The oil-water emulsion bottle is placed inside the constant temperature bath, the heater is placed at the bottom of the constant temperature bath, the viscosity sensor is placed inside the oil-water emulsion bottle, the output end of the viscosity sensor is connected to the data analysis system, and the data analysis system is connected to the data display system. The viscosity sensor includes a water region viscosity sensor, an oil-water emulsion region viscosity sensor, and an oil region viscosity sensor, with the distance between the water region viscosity sensor, the oil-water emulsion region viscosity sensor, and the oil region viscosity sensor and the bottom of the oil-water emulsion bottle gradually increasing.

[0008] In some embodiments of the present invention, the demulsifier effect evaluation system further includes a hollowed-out placement rack for fixing the oil-water emulsion bottle, the hollowed-out placement rack being disposed inside the constant temperature bath.

[0009] In some embodiments of the present invention, the demulsifier effect evaluation system further includes a heating medium filled in a constant temperature bath.

[0010] In some embodiments of the present invention, the viscosity sensor is a vibration-type viscosity sensor that measures local viscosity through vibration damping effect.

[0011] In some embodiments of the present invention, the data analysis system includes a signal receiver and a multivariate calculation module. The data output from the output end of the viscosity sensor enters the signal receiver and is then input into the multivariate calculation module. The multivariate calculation module processes the input viscosity data to obtain the height and inputs the height into the data display system.

[0012] In some embodiments of the present invention, the data display system is a display screen used to display the height of the water zone, the oil-water emulsion zone, and the oil zone.

[0013] A second aspect of the present invention provides a method for evaluating the effect of a demulsifier, employing the aforementioned demulsifier effect evaluation system, comprising: Add crude oil emulsion and demulsifier to the oil-water emulsion bottle, shake well, place in a constant temperature bath, and heat to the set temperature for constant temperature sedimentation; The viscosity sensor acquires the actual viscosity of the water zone, the oil-water emulsion zone, and the oil zone; the data analysis system determines the actual height of the water zone, the oil-water emulsion zone, and the oil zone based on the typical viscosity, the theoretical maximum height, and the actual viscosity, and inputs the actual height into the data display system.

[0014] In some embodiments of the present invention, the method for preparing the crude oil emulsion includes: mixing crude oil and water and stirring to obtain a crude oil emulsion.

[0015] Preferably, the crude oil is light crude oil, with a stirring speed of 3000 r / min and a stirring time of 30 min; the crude oil is medium crude oil, with a stirring speed of 2500 r / min and a stirring time of 30 min; and the crude oil is heavy crude oil, with a stirring speed of 2000 r / min and a stirring time of 30 min.

[0016] In some embodiments of the present invention, the heating medium in the constant temperature bath is methyl silicone oil, and the set temperature is 150-220°C.

[0017] In some embodiments of the present invention, the typical viscosities are as follows: 0.8-1.5 mPa·s in the water region, 10-200 mPa·s in the oil-water emulsion region, and 15-35 mPa·s in the oil region.

[0018] Preferably, the oil-water emulsion region is 80 mPa·s.

[0019] In some embodiments of the present invention, determining the actual height of the water zone, oil-water emulsion zone, and oil zone based on the typical viscosity, theoretical maximum height, and actual viscosity of the water zone, oil-water emulsion zone, and oil zone includes: By comparing the actual viscosity with the typical viscosity, the region to which the viscosity sensor's measurement point belongs can be determined, and the boundary height can be identified. Calculate and output the actual height of each area; The water zone height is the height of the upper boundary of the water zone.

[0020] The beneficial effects of this invention are as follows: This invention provides a demulsifier effect evaluation system. It uses a viscosity sensor to detect viscosity values ​​and a data analysis system to analyze and process the viscosity data to obtain the heights of the water zone, oil-water emulsion zone, and oil zone, thereby obtaining the dehydration height and realizing automatic and efficient evaluation of the demulsification effect of the demulsifier.

[0021] The demulsifier effectiveness evaluation system provided by this invention offers advantages such as breakthrough precision, full-process automation, reliable results, and strong industrial scenario compatibility. Specifically, by measuring the dynamic viscosity values ​​of the oil zone, oil-water emulsion zone, and water zone within the oil-water emulsion bottle in real time, and combining the characteristic viscosity thresholds of the three zones to calculate the height of each phase zone, it completely avoids errors from manual visual readings and interference from crude oil adhering to the walls, significantly improving the accuracy of dehydration height detection. Automatic identification of the three zone heights based on viscosity signals eliminates the need for manual observation or operation, greatly improving experimental efficiency and preventing temperature fluctuations caused by operational disturbances. The system integrates a multi-zone viscosity-height coupling algorithm to dynamically correlate the demulsification and dehydration process, overcoming the failure risk of single visual methods in scenarios with blurred interfaces and turbid water. The dual guarantee of high-temperature accurate simulation and quantitative data output allows demulsifier screening results to directly support on-site application decisions, significantly reducing pilot-scale costs and timelines. This invention can more accurately evaluate the performance of demulsifiers, providing an efficient and precise solution for the static evaluation of industrial demulsifiers.

[0022] Furthermore, high-temperature heat-conducting media such as dimethyl silicone oil (operating temperature 50-220℃) are used to fully cover the actual operating temperature of crude oil demulsification (125-140℃), solving the problem of demulsifier selection distortion caused by the traditional water bath temperature limit of 80℃, and ensuring more accurate demulsifier selection. Attached Figure Description

[0023] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0024] Figure 1 This is a structural diagram of the demulsifier effect evaluation system in Embodiment 1 of the present invention.

[0025] Figure 2 This is a structural diagram of the oil-water emulsion bottle in Embodiment 1 of the present invention.

[0026] Figure 3 This is a flowchart of the demulsifier effect evaluation method in Embodiment 2 of the present invention.

[0027] Figure 4 This is a data processing flowchart of the data analysis system in Embodiment 2 of the present invention; Figure 5 This is a flowchart illustrating how the maximum viscosity gradient point was found using the bisection method in Embodiment 2 of the present invention.

[0028] In the diagram: 1. CNC panel display screen; 2. Heating medium; 3. Heater; 4. Oil-water emulsion bottle; 5. Hollowed-out shelf; 6. Signal receiver; 7. Multivariable calculation module; 8. Viscosity sensor; 9. Constant temperature bath. Detailed Implementation

[0029] To enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention will be described in detail below with reference to specific embodiments.

[0030] Example 1 This embodiment provides a demulsifier effectiveness evaluation system, such as... Figure 1 As shown, it includes: a constant temperature bath 9, an oil-water emulsion bottle 4, a heater 3, a viscosity sensor 8, a data analysis system, and a data display system; The oil-water emulsion bottle 4 is located inside the constant temperature bath 9, the heater 3 is located at the bottom of the constant temperature bath 9, the viscosity sensor 8 is located inside the oil-water emulsion bottle 4, the output end of the viscosity sensor 8 is connected to the data analysis system, and the data analysis system is connected to the data display system. The viscosity sensor 8 includes a water region viscosity sensor, an oil-water emulsion region viscosity sensor, and an oil region viscosity sensor. The distance between the water region viscosity sensor, the oil-water emulsion region viscosity sensor, and the oil region viscosity sensor and the bottom of the oil-water emulsion bottle 4 gradually increases.

[0031] This invention determines the dehydration status of a crude oil-water mixture by measuring the viscosity of the mixture after the addition of a demulsifier, specifically based on the typical viscosity values ​​(μ) of the water zone, oil-water emulsion zone, and oil zone. 水区 μ 油水乳化区 μ 油区 Theoretical maximum height (H) max The actual heights of the water zone, oil-water emulsion zone, and oil zone are determined using actual viscosity data, resulting in the dehydration height (i.e., the actual height of the water zone). This method allows for real-time and accurate monitoring of dehydration during the demulsification process, avoiding the errors and inconveniences caused by frequent manual operations in traditional methods.

[0032] Understandably, the heater 3 is used to heat the heating medium in the constant temperature bath 9, and the constant temperature can be controlled and set using a PID feedback system to provide a stable ambient temperature for the dehydration process.

[0033] To improve the heating efficiency of heater 3, heater 3 is plate-shaped, i.e., a heating plate, which increases the contact area with the constant temperature bath 9 and improves the heating effect. The heating plate contains a thermocouple to heat the heating medium.

[0034] The demulsifier effect evaluation system also includes a hollowed-out placement rack 5 for fixing the oil-water emulsion bottle 4, which is located inside the constant temperature bath 9.

[0035] Understandably, the perforated placement rack 5 is made of stainless steel and is installed inside the constant temperature bath 9. Multiple insertion holes for oil-water emulsion bottles 4 are evenly distributed on its upper surface for securing the bottles. The perforated placement rack 5 facilitates observation of the emulsion breaking process, and the oil-water emulsion bottles 4 can be removed at any time. The perforated placement rack 5 does not affect the contact between the heating medium inside the constant temperature bath 9 and the oil-water emulsion bottles 4, and therefore does not affect the heating effect.

[0036] Among them, such as Figure 2 As shown, the oil-water emulsion bottle 4 is a 100 mL colorimetric tube with a sealing plug at the top and graduations on the side wall. Its outer diameter is compatible with the oil-water emulsion bottle insertion hole of the hollowed-out placement rack 5, and it is used to hold oil-water emulsions with added demulsifier.

[0037] The demulsifier effect evaluation system also includes a heating medium 2, which is filled in a constant temperature bath 9.

[0038] It is understood that the heating medium 2 is dimethyl silicone oil. Because dimethyl silicone oil has a high boiling point, it ensures a heating temperature of 150-220℃, which fully covers the actual application temperature of the demulsifier, ensuring the accuracy of demulsifier selection.

[0039] The viscosity sensor 8 is a vibration-type viscosity sensor that measures local viscosity (unit: mPa·s) through vibration damping effect.

[0040] like Figure 2 As shown, the viscosity sensor 8 is a multi-height viscosity sensor array, composed of multiple viscosity sensors at different heights. Specifically, the viscosity sensor corresponding to the water region has a height of 1-3 cm, the viscosity sensor corresponding to the oil-water emulsion region has a height of 1-5 cm, and the viscosity sensor corresponding to the oil region has a height of 1-8 cm. Viscosity sensors of different heights detect adhesion in different regions and transmit the actual viscosity to the data analysis system. Regional detection significantly improves the accuracy of the detection results.

[0041] The data analysis system includes a signal receiver 6 and a multivariate calculation module 7. Data output from the viscosity sensor 8 enters the signal receiver 6 and is then input to the multivariate calculation module 7. The multivariate calculation module 7 processes the input viscosity data to obtain the height, which is then input into the data display system.

[0042] The signal receiver 6 used in this invention is used to receive signals from the viscosity sensor, convert the signals into identifiable, processable, and usable information, and input them into the multivariate calculation module 7.

[0043] like Figure 4As shown, the multivariate calculation module 7 classifies the viscosity data collected in real time by the viscosity sensor 8 at different heights, dividing the collected viscosity data into water region viscosity, oil-water emulsion region viscosity, and oil region viscosity. The viscosity of each region is compared with the typical viscosity of the respective region to determine the area to which the measurement point belongs and to identify the boundary heights of the water region, oil-water emulsion region, and oil region. The actual height of each region is calculated based on the boundary heights. For example, the height H of the water region... water =Height of upper boundary of water zone - Height of bottle bottom, Dehydration height output: H dewater = Hwater Input the elevation of each zone into the data display system to display the elevation of each zone.

[0044] The data display system is a CNC panel display screen used to display the height of the water zone, the oil-water emulsion zone, and the oil zone, and to display the dehydration height in real time.

[0045] Specifically, let the total height of the oil-water emulsion bottle 4 be H. total There are N measurement points. The height of each point is h. i The corresponding viscosity value is μ i The multivariate calculation module 7 determines the region to which each measurement point belongs based on the preset viscosity range (typical viscosity range of 0.8-1.5 mPa.s in the water region at 150-180℃; typical viscosity of 10-200 mPa.s in the oil-water emulsion region, with a typical value of 80 mPa.s; typical viscosity range of 15-35 mPa.s in the oil region). If μ i Within the typical viscosity range of the water region, the measurement point is marked as the water region; If μ i Within the typical viscosity range of the oil-water emulsion region, the measurement point is marked as the oil-water emulsion region; If μ i Within the typical viscosity range of the oil region, the measurement point is marked as the oil region.

[0046] The region boundary is determined by finding the point with the largest viscosity gradient. Then, the height of the water region is the height difference between the lower boundary (bottom of the bottle) and the boundary between the water region and the oil-water emulsion region. The dehydration height is the height H of the water region. water .

[0047] This invention determines the dehydration status of a crude oil-water mixture by measuring the viscosity after adding a demulsifier, specifically by calculating the water zone, oil-water emulsion zone, and oil zone H. maxThe system uses viscosity data to determine the current water zone, oil-water emulsion zone, and oil zone heights. Subsequently, a signal receiver transmits this data to a multivariate calculation module to accurately calculate the dehydration height, which is then displayed on the CNC panel screen, thus avoiding errors from visual observation. Furthermore, methyl silicone oil can be used as the heating medium to simulate real-world application environments, ensuring more accurate demulsifier selection.

[0048] Example 2 This embodiment provides a method for evaluating the effect of demulsifiers, employing the aforementioned demulsifier effect evaluation system, including: Add crude oil emulsion and demulsifier to the oil-water emulsion bottle, shake well, place in a constant temperature bath, and heat to the set temperature for constant temperature sedimentation; The viscosity sensor acquires the actual viscosity of the water zone, the oil-water emulsion zone, and the oil zone; the data analysis system determines the actual height of the water zone, the oil-water emulsion zone, and the oil zone based on the typical viscosity, the theoretical maximum height, and the actual viscosity, and inputs the actual height into the data display system.

[0049] The method for preparing the crude oil emulsion includes: mixing crude oil and water and stirring to obtain a crude oil emulsion.

[0050] Wherein, the crude oil is light crude oil, the stirring speed is 3000 r / min, and the stirring time is 30 min; the crude oil is medium crude oil, the stirring speed is 2500 r / min, and the stirring time is 30 min; the crude oil is heavy crude oil, the stirring speed is 2000 r / min, and the stirring time is 30 min.

[0051] The heating medium in the constant temperature bath is methyl silicone oil, and the set temperature is 150-220℃.

[0052] The typical viscosities are as follows: 0.8-1.5 mPa·s in the water region, 10-200 mPa·s in the oil-water emulsion region, and 15-35 mPa·s in the oil region.

[0053] The oil-water emulsion region has a strength of 80 mPa·s.

[0054] The determination of the actual height of the water zone, oil-water emulsion zone, and oil zone based on their typical viscosity, theoretical maximum height, and actual viscosity includes: By comparing the actual viscosity with the typical viscosity, the region to which the viscosity sensor's measurement point belongs can be determined, and the boundary height can be identified. Calculate and output the actual height of each area; The water zone height is the height of the upper boundary of the water zone.

[0055] like Figure 4As shown, the multivariate calculation module 7 classifies the viscosity data collected in real time by the viscosity sensor 8 at different heights, dividing the collected viscosity data into water region viscosity, oil-water emulsion region viscosity, and oil region viscosity. The viscosity of each region is compared with the typical viscosity of the respective region to determine the area to which the measurement point belongs and to identify the boundary heights of the water region, oil-water emulsion region, and oil region. The actual height of each region is calculated based on the boundary heights. For example, the height H of the water region... water =Height of upper boundary of water zone - Height of bottle bottom, Dehydration height output: H dewater = Hwater Input the elevation of each zone into the data display system to display the elevation of each zone.

[0056] Specifically, let the total height of the oil-water emulsion bottle 4 be H. total There are N measurement points. The height of each point is h. i The corresponding viscosity value is μ i The multivariate calculation module 7 determines the region to which each measurement point belongs based on the preset viscosity range (typical viscosity range of 0.8-1.5 mPa.s in the water region at 150-180℃; typical viscosity of 10-200 mPa.s in the oil-water emulsion region, with a typical value of 80 mPa.s; typical viscosity range of 15-35 mPa.s in the oil region). If μ i If the viscosity is close to that of water, then mark the measurement point as the water region; If μ i Approximately the typical viscosity of the oil-water emulsion region; mark the measurement point as the oil-water emulsion region. If μ i The measurement point is marked as the oil zone, close to the typical viscosity of the oil zone.

[0057] The region boundary is determined by finding the point with the largest viscosity gradient. Then, the height of the water region is the height difference between the lower boundary (bottom of the bottle) and the boundary between the water region and the oil-water emulsion region. The dehydration height is the height H of the water region. water .

[0058] The point of maximum viscosity gradient is found using the bisection method, such as... Figure 5 As shown, the steps are as follows: 1. Initialize height range (1) Let the total height of the oil-water emulsion bottle be H. total .

[0059] (2) The initial interval is the entire height of the bottle: 0, H total .

[0060] (3) Take the height of the midpoint: H mid = Htotal / 2.

[0061] 2. Partition Search Divide the total height into two sub-sections: (1) Interval A: (0-H) mid ) (2) Interval B: (H mid -H total ) 3. Search for the boundary between the water region and the oil-water emulsion region in interval A. (1) Within this interval, the point with the largest viscosity gradient is found by the bisection method.

[0062] Specifically, it includes: Calculate the middle position mid, i.e., H mid / 2; Calculate the height as 0, H mid The viscosity gradient between / 2, i.e., Δ 0-Hmid / 2 =|μ0-μ Hmid / 2 |; The calculated height is H mid / 2、H mid The viscosity gradient between them, i.e., Δ Hmid / 2-Hmid =|μ Hmid / 2 -μ Hmid |; Compare Δ 0-Hmid / 2 With Δ Hmid / 2-Hmid If Δ 0-Hmid / 2 >Δ Hmid / 2-Hmid Then at height 0, H mid Continue searching between / 2. If Δ 0-Hmid / 2 <Δ Hmid / 2-Hmid Then at height H mid / 2、H mid Continue the search between them. If Δ 0-Hmid / 2 =Δ Hmid / 2-Hmid If the value is 0, then the mid position is returned.

[0063] (2) Determine whether the viscosity at this point jumps from the typical viscosity of the water region (0.8-1.5 mPa·s) to the typical viscosity of the oil-water emulsion region (10-200 mPa·s).

[0064] Specifically, if the viscosity at a position above this point is within 10-200 mPa·s, and the viscosity at a position below this point is within 0.8-1.5 mPa·s, then it is determined that the viscosity at this point jumps from the typical viscosity of the water region to the typical viscosity of the oil-water emulsion region.

[0065] (3) If it is true, then the height of the point is the boundary height between the water area and the oil-water emulsion area.

[0066] 4. Search for the boundary between the oil-water emulsion region and the oil region in interval B. (1) Within this interval, the point with the largest viscosity gradient is found by the bisection method.

[0067] Specifically, it includes: Calculate the middle position mid, i.e. (H mid +H total ) / 2; The calculated height is H mid 、(H mid +H total The viscosity gradient between ) / 2, i.e., Δ1=|μ Hmid -μ （Hmid+Htotal） / 2 |; The calculated height is (H) mid +H total ) / 2、H total The viscosity gradient between them, i.e., Δ2=|μ （Hmid+Htotal） / 2 -μ Htotal |; Compare Δ1 and Δ2: If Δ1 > Δ2, then at height H mid 、(H mid +H total Continue the search between Δ1 and Δ2. If Δ1 < Δ2, then continue the search at height (H) / 2. mid +H total ) / 2、H total Continue the search between them. If Δ1 = Δ2, then return the mid position.

[0068] (2) Determine whether the viscosity at this point jumps from the typical viscosity of the oil-water emulsion region (10-200 mPa·s) to the typical viscosity of the oil region (15-35 mPa·s).

[0069] Specifically, if the viscosity at a position above this point is within 15-35 mPa·s, and the viscosity at a position below this point is within 10-200 mPa·s, then the viscosity at this point is determined to be a jump from the typical viscosity of the oil-water emulsion region to the typical viscosity of the oil region.

[0070] (3) If it is true, then the height of the point is the boundary height between the oil-water emulsion area and the oil area.

[0071] 5. Calculate the height of each area. (1) Water zone height = Boundary height between water zone and oil-water emulsion zone (2) Height of oil-water emulsion zone = Boundary height between oil-water emulsion zone and oil zone - Boundary height between water zone and oil-water emulsion zone (3) Oil zone height = total height - boundary height between oil-water emulsion zone and oil zone This embodiment also provides a specific process: Assuming total height H total =20cm, midpoint H mid =10cm: (1) In the interval A (0-10 cm), it is found that the viscosity jumps from 1.2 mPa·s to 80 mPa·s at a height of 5 cm. Therefore, the position at a height of 5 cm is determined to be the boundary between the water region and the oil-water emulsion region.

[0072] (2) In the interval B (10-20 cm), it was found that the viscosity at a height of 15 cm decreased from 80 mPa·s to 20 mPa·s. Therefore, the position at a height of 15 cm is determined to be the boundary between the oil-water emulsion zone and the oil zone.

[0073] Then we can obtain: Water level = 5 cm Height of the oil-water emulsion area = 15 - 5 = 10 cm Oil zone height = 20 - 15 = 5 cm The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A demulsifier efficacy evaluation system, characterized in that, include: Thermostatic bath, oil-water emulsion bottle, heater, viscosity sensor, data analysis system and data display system; The oil-water emulsion bottle is placed inside the constant temperature bath, the heater is placed at the bottom of the constant temperature bath, the viscosity sensor is placed inside the oil-water emulsion bottle, the output end of the viscosity sensor is connected to the data analysis system, and the data analysis system is connected to the data display system. The viscosity sensor includes a water region viscosity sensor, an oil-water emulsion region viscosity sensor, and an oil region viscosity sensor, with the distance between the water region viscosity sensor, the oil-water emulsion region viscosity sensor, and the oil region viscosity sensor and the bottom of the oil-water emulsion bottle gradually increasing.

2. The demulsifier effect evaluation system as described in claim 1, characterized in that, The demulsifier effect evaluation system also includes a hollowed-out placement rack for fixing the oil-water emulsion bottle, the hollowed-out placement rack being disposed inside the constant temperature bath; Preferably, the demulsifier effect evaluation system further includes a heating medium, which is filled in a constant temperature bath.

3. The demulsifier effect evaluation system as described in claim 1, characterized in that, The viscosity sensor is a vibration-type viscosity sensor that measures local viscosity through the vibration damping effect.

4. The demulsifier effect evaluation system as described in claim 1, characterized in that, The data analysis system includes a signal receiver and a multivariate calculation module. The data output from the viscosity sensor enters the signal receiver and is then input into the multivariate calculation module. The multivariate calculation module processes the input viscosity data to obtain the height and inputs the height into the data display system.

5. The demulsifier effect evaluation system as described in claim 4, characterized in that, The data display system is a display screen used to show the height of the water zone, the oil-water emulsion zone, and the oil zone.

6. A method for evaluating the effect of a demulsifier, characterized in that, The demulsifier effect evaluation system according to any one of claims 1-5 includes: Add crude oil emulsion and demulsifier to the oil-water emulsion bottle, shake well, place in a constant temperature bath, and heat to the set temperature for constant temperature sedimentation; The viscosity sensor acquires the actual viscosity of the water zone, the oil-water emulsion zone, and the oil zone; the data analysis system determines the actual height of the water zone, the oil-water emulsion zone, and the oil zone based on the typical viscosity, the theoretical maximum height, and the actual viscosity, and inputs the actual height into the data display system.

7. The method for evaluating the effect of demulsifier as described in claim 6, characterized in that, The method for preparing the crude oil emulsion includes: mixing crude oil and water and stirring to obtain a crude oil emulsion; Preferably, the crude oil is light crude oil, with a stirring speed of 3000 r / min and a stirring time of 30 min; the crude oil is medium crude oil, with a stirring speed of 2500 r / min and a stirring time of 30 min; and the crude oil is heavy crude oil, with a stirring speed of 2000 r / min and a stirring time of 30 min.

8. The method for evaluating the effect of demulsifier as described in claim 6, characterized in that, The heating medium in the constant temperature bath is methyl silicone oil, and the set temperature is 150-220℃.

9. The method for evaluating the effect of demulsifier as described in claim 6, characterized in that, The typical viscosities are as follows: 0.8-1.5 mPa·s in the water region, 10-200 mPa·s in the oil-water emulsion region, and 15-35 mPa·s in the oil region; Preferably, the oil-water emulsion region is 80 mPa·s.

10. The method for evaluating the effect of demulsifier as described in claim 6, characterized in that, The determination of the actual height of the water zone, oil-water emulsion zone, and oil zone based on the typical viscosity, theoretical maximum height, and actual viscosity includes: By comparing the actual viscosity with the typical viscosity, the region to which the viscosity sensor's measurement point belongs can be determined, and the boundary height can be identified. Calculate and output the actual height of each area.

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