SY/T 0521-1993 Microscopic observation method for determination of wax precipitation point of crude oilSY/T0521-1993 Standard download decompression password: www.bzxz.net

Petroleum and Natural Gas Industry Standard of the People's Republic of China SY/T0521-93
Determination of Wax Precipitation Point of Crude Oil
Microscopic Observation Method
Published on March 27, 1993
Ministry of Energy of the People's Republic of China
Implementation on September 1, 1993
1 Subject Content and Scope of Application
Petroleum and Natural Gas Industry Standard of the People's Republic of China Determination of Wax Precipitation Point of Crude Oil
Microscopic Observation Method
This standard specifies the method for observing the wax precipitation point of waxy crude oil using a television microscope or a microscope. This standard is applicable to the determination of the wax precipitation point of crude oil with a water content of no more than 0.5%. 2 Method Overview
$Y/T 0521---93
After heating the sample to melt all the wax in the crude oil, cool it under specified conditions and observe it on the television microscope monitor screen or under a microscope. The temperature at which wax crystallization first appears is identified as the wax precipitation point. 3 Equipment and Materials
3.1 Microscope
The magnification is not less than 150 times. A TV microscopic observation system consisting of a camera and a monitoring device can also be added. 3.2 Microscopic observation hot stage
The hot stage adopts a semi-enclosed type to ensure the stability of the observed temperature field and is equipped with a digital display surface temperature. For examples, see Appendix A (reference).
3.3 Digital display surface thermometer.
The graduation value is 0.1℃.
3.4 ​​Constant temperature circulator
At a given temperature, the temperature fluctuation does not exceed ±0.1℃3.5 Sample bottle
501n1 ground mouth bottle
3.6 Slides, cover glass
Special slides and cover glass for laboratory microscopic observation. 4 Test steps
4.1 Preparation of test pieces
4.1.1 Clean the glass slide and cover slip with gasoline, and then wipe them clean with a cotton-free, white silk cloth. 4.1.2 Preheat and dry the clean glass slide and cover slip. 4.1.3 Use an old glass rod to stir the sample evenly, take out a drop of the sample and drop it on the glass slide, press the cover slip on it to form a uniform film. Prepare 3 test pieces in this way, and the prepared test pieces should be used within 24 hours. 4.2 Adjust the focuswwW.bzxz.Net
Put the prepared test piece on the hot stage and place it under the microscope, adjust the lens focus, and after observing the wax crystals of the sample towel on the blue viewer screen or in the microscope, fine-tune the lens focus to the clearest state. 4.3 Heating
Approved by the Ministry of Energy of the People's Republic of China on March 27, 1993 and implemented on September 1, 1993
SY/T0521-93
Start the water pump of the thermostatic circulator, heat the hot plate until no wax crystals are observed in the sample, and keep the temperature constant for 10 minutes. (Generally heated to 70℃)a
4.4 Cooling observation
Control the thermostatic circulator to cool down at a rate of (0.5~1.0℃)/min. When the temperature of the hot plate drops to a temperature close to the wax precipitation point, move the hot plate slightly in the horizontal direction, and pay attention to the edge and middle of the test piece until wax products are observed on the monitor screen or in the microscope. Note the temperature displayed on the thermometer at this time, which is the wax precipitation point observed for the test piece. 4.5 Selection of measured values
4.5.1 Observe 3 test pieces in sequence according to methods 4.2 to 4.4. 4.5.2 Take the highest value among the three wax precipitation points of the test piece as the wax precipitation point of this determination. 5 Precision
Judge the reliability of the determination result according to the following provisions (95% and Xin Yongping): 5. 1 Repeatability
The difference between the results of two repeated determinations of the same sample by the same operator, using the same instrument in the same laboratory, and following the steps specified in the method at consecutive times shall not exceed 3°C. 6 Report
Take the arithmetic mean of the two repeated determination results as the wax precipitation point of the sample. 2
SY/T 0521--93
Agglomeration A
Microscopic observation hot plate structure diagram
(reference)
1—Anti-corrosion 2—Assembly, 3—Sealing gasket (1), 4—Upper cover (stainless steel): 5—Test piece: 6—Glass cover plate (1),—Seal gasket (2)—Glass cover (2): E—Seat: 1C—Jade ring (stainless steel) 111—Sealing gasket (3) Additional remarks:
This standard was proposed by China National Petroleum Corporation. This standard is under the jurisdiction of the Planning and Design Institute of China National Petroleum Corporation. This standard was drafted by Daqing Oilfield Construction Design Institute. The drafter of this standard is Zhao Guozhong.
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