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Low-temperature emulsion-breaking method for crude oil emulsion

A technology of emulsion and crude oil, applied in the direction of chemical dehydration/demulsification, etc., can solve the problems of increased thickness of the middle layer of the settling tank, high cost, long cycle, etc., and achieve the effect of simple process and easy operation

Inactive Publication Date: 2012-05-02
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after the heating was stopped, the temperature of the crude oil dropped to 20°C to 23°C, the thickness of the middle layer of the settling tank increased significantly, the operation of the settling tank was unstable, the dehydration effect of the crude oil was poor, and the water content was high, which failed to meet the standard
The reduction of daily crude oil production by dozens of tons has seriously affected the crude oil output of the dehydration station and caused major economic losses. This is the main problem existing in the northern crude oil dehydration station at present.
At present, most crude oil dehydration stations plan to adopt the method of adding heating facilities or replacing demulsifiers, but the cost of adding heating facilities is expensive, which will greatly increase the cost of crude oil dehydration and the complexity of operation, and it is difficult to implement
In addition, there are many disadvantages in changing the demulsifier. The specificity of the demulsifier is strong and the adaptability is poor. It is quite difficult to screen out the demulsifier suitable for the condition of 20 ℃ ~ 23 ℃, the cycle is long, and the uncertainty is large.

Method used

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  • Low-temperature emulsion-breaking method for crude oil emulsion
  • Low-temperature emulsion-breaking method for crude oil emulsion
  • Low-temperature emulsion-breaking method for crude oil emulsion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The applicability research of embodiment 1 different crude oils

[0048] The high temperature in the laboratory (31°C) simulates the temperature of the crude oil emulsion in the settling tank when the oil production plant is heated in winter, and the low temperature (20°C) in the laboratory simulates the temperature of the crude oil emulsion in the settling tank after the oil production plant stops heating.

[0049] Embodiment 1 investigated the adaptability of the present invention to different crude oils. Five different crude oil samples were used in the test. The crude oil samples were collected from six different oil wells in Hualian Station of Changqing Oilfield, with water content ranging from 10% to 40%. The characteristics of the crude oil emulsion and test control conditions are shown in Table 2. The dehydration effects of five crude oil emulsions under different dosages of demulsifiers, different precipitation times and different temperatures were investigated...

Embodiment 2

[0061] Embodiment 2 is studied to the applicability of different demulsifiers

[0062] Embodiment 2 investigates the adaptability of the present invention to different demulsifiers, adopts 5# crude oil emulsion sample (water content 30%~40%) to carry out test, adds 3 kinds of different demulsifiers A, B, C, its characteristic And test control conditions are shown in Table 3. The dehydration effect of three kinds of demulsifiers on crude oil emulsion under the conditions of different dosage of demulsifiers, different settling time and different temperature were investigated.

[0063] experiment method

[0064] Table 3 Demulsifier characteristics and test control conditions

[0065]

[0066] The specific test method is the same as in Example 1, and the difference from Example 1 is that Example 2 has adopted 3 kinds of demulsifiers and 1 crude oil emulsion (the 5# crude oil sample in Example 1) to test. According to the method described in Example 1, the temperature of the ...

Embodiment 3

[0074] The study of the impact of embodiment 3 on the dosage of demulsifier

[0075] Embodiment 3 investigated the influence of the present invention on the dosage of demulsifier. The test uses 3# crude oil emulsion sample (moisture content 10%-15%) and 5# crude oil emulsion sample (water content 30%-40%), adding demulsifier B and C respectively. The test scheme is shown in Table 4 shown. Investigate the dehydration effect of crude oil emulsion under different dosages of demulsifiers, different settling time and different temperature conditions when adding high and low demulsifier doses.

[0076] Table 4 Demulsifier dosage and test control conditions

[0077]

[0078] experiment method

[0079] The specific test method is to take 20 mL of crude oil sample each time and add it to a 25 mL test tube, control the temperature of the crude oil at 20 ° C and 31 ° C according to the method described in Example 1, add 75 mg / L, 150 mg / L demulsifier B, C, and then add A certain am...

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Abstract

The invention discloses a low-temperature emulsion-breaking method for crude oil emulsion. The method comprises: adding a proper amount of emulsion breaker into crude oil emulsion in a setting tank when the temperature of the crude oil emulsion drops to 20 to 30 DEG C, adding emulsion braking aid in an amount which is 5 to 15 percent based on the total weight of the crude oil, and after the crude oil emulsion, the emulsion breaker and the emulsion breaking aid are fully mixed, standing 2 to 5 hours for settling, and separating oil from water in crude oil emulsion, wherein the emulsion breaking aid is C4 to C22 aliphatic hydrocarbon, cyclic hydrocarbon, or mixed hydrocarbon light low-viscosity oil of C4 to C22 aliphatic hydrocarbon and cyclic hydrocarbon. When the method is used, the original emulsion breaker can retain good emulsion breaking effect under a low-temperature condition without heating facilities and replacing emulsion breaker, the thickness of the intermediate layer of the settling tank can be reduced, the low-temperature crude oil is quickly dewatered, the crude oil dewatering quality reaches standard and is simple and easy, and the added amount of the emulsion breaker is reduced.

Description

technical field [0001] The invention belongs to the field of petrochemical industry and relates to a crude oil dehydration method under low temperature conditions, in particular to a low-temperature demulsification method of crude oil emulsion. Background technique [0002] Chemical demulsification is the main method of crude oil dehydration in my country at present. The chemical demulsification method requires the temperature of crude oil to be above 35°C. Adding demulsifier can achieve the purpose of dehydration of crude oil. Therefore, the existing crude oil dehydration stations all need to heat the crude oil, and the heating system is generally used in northern my country to heat it in winter, which is low in cost and easy to implement. However, after the heating was stopped, the temperature of the crude oil dropped to 20°C-23°C, the thickness of the middle layer of the settling tank increased significantly, the operation of the settling tank was unstable, the dehydratio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G33/04
Inventor 徐金兰惠会明周学军畅坤王磊蒋欣南天界杨彦柳
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY