The way to determine the aggregate stability of oil-water emulsions

 

(57) Abstract:

The invention relates to the field treatment of oil, specifically to dehydration and desalting of oil in the oil fields and refineries. The invention consists in that before and after the introduction of demulsifier measure kinematic viscosity at the same temperature with subsequent determination of aggregate stability by the formula AU=C1-2)/1100, where AU-aggregate stability, %;1- kinematic viscosity of the emulsion before adding the demulsifier, 2- kinematic viscosity of the emulsion after the addition of demulsifier, C - constant. table 2., 8 Il.

The invention relates to the preparation of the oil, specifically to dehydration and desalting of oil in the oil fields and refineries, and can be used to assess the efficiency of the dehydration process oil.

The known method of determining water content in petroleum and petroleum products determination of the results of the analysis of aggregate stability of oil-water emulsions [1].

The disadvantage of this method is the complexity and duration of the process of separation.

Known the negative resistance of oil-water emulsions [2].

However, this method of determining time-consuming and determination of aggregate stability associated with large errors and duration.

Spectral method for the determination of water content in crude oil and petroleum products with subsequent determination of aggregate stability of oil-water emulsions [3].

However, this method is time consuming, requires sophisticated equipment, skilled care and is associated with the duration of the assessment of aggregate stability.

There is a method of assessing aggregate stability by changing the conductivity of oil-water emulsions [4].

However, this method is not applicable in an industrial environment, and is suitable only for scientific and laboratory research.

Known method (prototype) developed Vniisptneft, which is to determine the volume of water released from the emulsion after the addition of demulsifier [5].

According to this method aggregate stability is analyzed as follows: after sampling the latest asserted by 30 minutes the Pooled oil in the amount of 10 cm3centrifuged 30 minutes the amount of water Released B1expressed in percent by volume of the sample (10 cmcentrifugeuse within 15 minutes The newly measured amount of water B2in %, and the value of aggregate stability is expressed in the form

< / BR>
where AY - aggregate stability, %;

B1the amount of separated water after the first centrifugation, cm3;

B2the amount of separated water after the second centrifugation, cm3.

The analysis results from the laboratory are transferred to Providence.

The main disadvantage of this method of analysis is its duration and the inability to assess the validity of the emulsifier in emulgirovanija.

The purpose of the invention is the rapid determination of aggregate stability and efficiency of dewatering a water-oil emulsion.

The invention consists in that before and after the chemical injection measure kinematic viscosity at the same temperature with subsequent determination of aggregate stability by the formula

< / BR>
where AY - aggregate stability, %;

1- kinematic viscosity of the emulsion before adding the demulsifier, mm2;

2- kinematic viscosity of the emulsion after the addition of demulsifier, mm2;

C is a constant.

When the dispersion of two immiscible liquids are formed oil-water emulsion. All of the emulsion system is thermodynamically unstable, and they seek to stratification. Stability of oil-water emulsions appreciate the aggregative stability.

Aggregate stability of oil-water emulsions is the ability of the globules of the dispersed phase when they collide with each other or with phase boundary to maintain its original size. The mechanism of formation of aggregately stable oil emulsions, the issues of stabilization and destruction vodone the main stability of the emulsion system, made with two clean, immiscible liquids, it is necessary the presence of a third stabilizing component.

The essence of the process of preparation of an emulsion for stratification is to minimize its resistance to a specified level. For intensification of the process of destruction of oil-water dispersed systems in emulsion injected demulsifier. Adding reagent - demulsifier in oil emulsion gives an opportunity to break a solid gel-like layers of natural stabilizers oil emulsions (asphaltenes, resins, insoluble organic acids, solids and others) included in the protective shells of globules of water, and promotes the transfer of particles of natural stabilizers with the phase boundaries in the volume of the aqueous phase.

Consumption of demolatorul should be sufficient to ensure maximum efficiency of the dehydration process oil. The effectiveness of demulsifiers to reduce aggregate stability of oil-water emulsions is measured in different ways.

For implementing the method of the analysis of the aggregate stability of the emulsion was carried out more than 100 laboratory experiments, the result of which was naide the more the viscosity, the less amount of sludge and, on the contrary, when the quantity of sludge water the viscosity of the emulsion is reduced. An indispensable condition of the experiment is determined at the same temperature. On the basis of experimental calculations on a computer was obtained ratio

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According to the experimental data was performed correlation analysis on the computer. Which was confirmed by a strong correlation between the viscosity and the amount of sludge: the correlation coefficient Kk, , = -0,85 , and the resulting regression equation is the dependence between the two parameters and sludge emulsion.

As the source data for this example was used viscosity and sludge emulsion with fixed values of demulsifier (20 g/m3and sludge (60 min). For a known group of oil time sludge is chosen so as to exclude the influence of dynamics on the amount of sludge.

According to the results of the calculated and experimental data was constructed system of analysis of aggregate stability of the emulsion is shown in the block diagram (Fig. 1).

Structural scheme consists of a tank sedimentation tank (1) with sensor-transmitter (2), two viscosimetrically mechanisms (6) and the device control and information processing (7) piping (8).

Analyzing system aggregate stability in dependence on the viscosity of the emulsion is as follows.

Oil-water emulsion through the actuator (6) is supplied to fill in the settling tank (1), where the fluid level is limited by the sensor-transmitter (2). To achieve the optimal level of filling of the flow of oil-water emulsion is terminated. After that, the liquid flows through the actuator (6) and a viscometer (3) in a mixing tank (5), where both containers microdonation (2) enters the demulsifier. In the mixer there is a mixture of a water-oil emulsion with a demulsifying agent, and then settling over time, allowing to eliminate the influence of dynamics on the amount of sludge (in the example, 60 min). At the same time, through the actuator (6) in the settling tank (1) is a new stream of oil and water emulsion and at the same time after mixing tank (5) via the actuator (6) and a viscometer (3) leaves dehydrated oil pipeline network (8).

Thus, there is an assessment of aggregate stability (AU) oil-water emulsion from a thread on the measurement of the viscosity of the oil before and after adding TE at the table. 1 and 2,

< / BR>
where Bsweatpotential water content after adding 100 g of TE per ton of crude oil, %;

Bi- the amount of water separated after the first centrifugation, or the current selection of water after the appropriate (less than 100 g/t) add TE, %;

< / BR>
where ewithnormalized static efficiency;

< / BR>
where ednormalized differential efficiency;

< / BR>
< / BR>
where is the relative viscosity.

On the basis of the calculation by formulas (4) and (8) the dependences (see Fig. 2-8).

Analysis of the obtained dependences shows that between AU and normalized edand the relative change of kinematic viscosity, there is a close correlation, which suggests an indirect indicator of oil quality and effectiveness of edrecommend to use in the fields of the relative change of kinematic viscosity.

The results of the studies above show that the relative change of viscosity of crude oil by adding TE characterizes the degree of preparedness of oil and effectiveness of TE. The level of viscosity, ease of measurement and high automation..

Thus, the method of determining aggregate stability of oil-water emulsion allows Express to determine aggregate stability and effectively dehydrating water-oil emulsion. This technical solution are not described in literature, which allows to recognize the claimed method meets the criterion of "significant differences".

The feasibility of the method in the preparation of the oil meets the criterion of "significant differences".

Bibliography

1. GOST 2477-65. Method for the determination of water content in oil and oil products.

2. Belyakov C. L. automation field treatment of oil and water. -M.: Nedra, 1988, S. 232.

3. Nelson M. P., Kucherov, Y. M., Janowski C. Y. Spectral analysis methods. - Publishing house VNIIEM, 1977.

4. Pribus A., Determination of aggregate stability of the emulsions according to the rate of coalescence of the droplets of electrolyte in the organic medium //Tiora. fundamentals of chem. engineer., 1990, 24 so.- N 6.-S. 827-832.

5. Verevkin, A. P. and others to evaluate the efficiency and optimize the use of demulsifiers at field treatment of oil. // EI Ser.: Technique and technology of oil and petroleum deposits. -M.: VNIIEM, Vol. 4, ie of demulsifier, sucks emulsion for a certain period of time, characterized in that before and after the introduction of demulsifier measure kinematic viscosity at the same temperature with subsequent determination of aggregate stability by the formula

< / BR>
where AU - aggregate stability, %;

1- kinematic viscosity of the emulsion before adding the demulsifier;

2- kinematic viscosity of the emulsion after the addition of demulsifier,

C - constant.

 

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