SU910736A1 - Composition for dehydrating and desalting petroleum - Google Patents

Description

(5) COMPOSITION FOR WASHING AND OIL WASHING

The invention relates to oil preparation and can be used both in field oil treatment plants and in oil refineries in the process of deep dewatering and desalting of oil. Formulations for the dehydration and desalting of petroleum are known, including an aqueous solution of partially hydrolyzed polyacrylamide (PAA) or a mixture containing surfactant (surfactant), sodium silicate, partially hydrolyzed polyacrylamide, and water 1.

However, this composition does not have a sufficiently high efficiency, and the step of preparing an aqueous solution of polyacrylamide with the necessary concentration is a low-tech operation under field conditions, especially in winter, since for the preparation of an aqueous solution

where n 5-12,

and water in the following ratio

components, weight:

Non-ionic demulsifier based on ethylene oxide block copolymer. flax and propylene oxide O, .07 PAA requires a high-speed mixer with cutting knives. The closest to the proposed is a composition for dehydration and desalting of oil | 2j, including a non-ionic demulsifier based on a block copolymer of ethylene oxide and propylene oxide, polyethylene polyamine amine of the general formula g11-C.C Hg-C Hg: - C} H2-Cn-Lig T ccgs-Ng-Kng Polyethylenepolyamine 0.0i | 0, of the general formula I Up to 100 However, this composition does not provide a sufficient depth of dehydration and desalting of oil, since a significant amount of chloride salts remains in the oil. The aim of the invention is to increase the effectiveness of the composition used for deep dewatering and desalting of oil. The goal is achieved by the fact that the composition for the dehydration and desalting of oil, including a non-ionic demulsifier based on a block copolymer of ethylene oxide and propylene oxide, a water-soluble nitrogen-containing polymer and water, as a water-soluble nitrogen-containing polymer, it contains a heart rate profile, a heart rate profile, a flame heart rate modifier, a flame heart rate modifier, a flame heart rate modifier, a flame heart rate modifier, and a heart rate profile. СНг-н1- L {- 1- IJ „with mol. weight. 25000-85000 in the following ratio of components, weight. Non-ionic demulsifier based on block copolymer of ethylene oxide and propylene oxide 0.03-0.07 on the product of modification of polyethylenimine with the specified 0,, 10 formula Up to 100 This composition is expedient to use in the deep desulfurization of oils that have already undergone treatment for the purpose of dehydration. Example 1 Desalting of the oil is carried out into a viscous, highly paraffinic oil of the Sultangulovo-Zagladinsky deposit, which has been dehydrated at an oil preparation unit and contains 5120 mg / l of chloride salts and water of 0.75. An aqueous solution of the following composition is prepared, weight: Dissolvan k 0.05 Polyethylenimine urea modification product0, 06 Water Up to 100 V, heated to the composition, oil is introduced with the same temperature and the mixture is stirred. At a stirrer at 600 rpm for 5 min (volume ratio 90; 10). After settling under isothermal conditions, an average sample is taken and the analysis for the content of chloride salts is performed using a salimeter (LAS-1). For comparison, under the same conditions and on the same oil, the effectiveness of a known composition with the following ratios of ingredients, wt.%: Dissolvan kk 0.05 Polyethylene polyamine Formula IO, VodoDo 100 The data obtained are given in Table. 1. The content of chloride salts in petroleum in comparison with the initial sample during the treatment with the present composition decreases by more than 80 times. Example 2 Desalting is subjected to viscous, highly paraffinic oil, which has undergone dehydration at the oil treatment station and contains 5120 mg / l of chloride salts and 0.75 of water. An aqueous solution of the following composition is prepared: wt. Separol-250.05 Product of polyethyleneimine urea modification 0.06 Water. Up to 100 For comparison, the effectiveness of a known composition is tested under the same conditions and on the same oil with the following ratios of ingredients, weight. Separol-250,05 Polyethylenepolyamine of formula I0.06 Water up to 100 Oil treatment is carried out as in example 1.

The results are shown in Table. 2

From the data given in table. 2 that the oil obtained after treatment with this composition according to example 2 contains 73 times less chloride salts than the original sample.

In tab. 3 shows the results of the processing of oil with the proposed composition with different sowing components. J

Example 3 The dehydrating properties of the proposed composition are studied by the following method

The research is carried out in laboratory conditions on an artificial emulsion, which is prepared on anhydrous and formation water of one field. For the preparation of emulsions, a mixture of anhydrous oil and produced water is taken (a 20% emulsion is prepared as the most resistant). The mixture is washed down in a glass mixer with a capacity of 800 ml. The dispersion is carried out at a constant rotational speed with a mixer of the type tissue grinder lOOO rpm for 3 minutes. All samples are dispersed in the same

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conditions so that the resulting emulsion has the same degree of dispersion. After that, rvagents - demulsifiers in the form of a TZ-th aqueous solution in an amount of 0.02-0.10 weight are added to the emulsion, poured into Lysenko’s septic tanks. from recovered oil. The samples are thoroughly mixed on an automatic LE-203 mixer for a minute. Next, the samples are placed in a sludge in a water bath for 2 hours. Every 15, 30, 60, 120 minutes, the amount of separated water is measured in sumps. The data obtained as a result of the study are given in table. - 7, where the relative effectiveness of the compositions when processing the water-oil emulsion of the Sultangulovo-Zaglinskoe field is indicated. Table 8 shows the data on the desalting of oil according to the method of Example 1 using the product of modification of polyethylenimine urea with

various molecular weights.

one

In tab. 9 shows data on the dehydration of oil when using the product of polyethyleneimine urea modification with different molecular weights mixed with a non-ionic demulsifier of Example 3.

Table 1

Dissolvan TS 1

79 Polyethylenepolyamine formula 1

63

Dissolvan 411 Product modification polyethyleneimine urea Neiono Separ

0.03 0.07

0.03 0.07

Up to 100

119 51 126 Up to 100 Up to 100 62 Up to 100 Composition when Residual speroptal Compounds Chlorine concentrations xBlue, mg / l Known Separol-2598 Polyethylenepolyamine of formula 1; Proposed Separol-2570 Polyethylenimine urea modification product Water gene demulsifier, Product my-Residual weight Determination content of ol-25Dissolvan-min urea-Bett% salts, 1%, wt.% Mg / l Table 2

Table

eleven

910736

12

Table 5 Note.

Table 7

Table 8 Mol. weight. product modification polyethylenimine / yucheviny, srvc. units : A - 25000, B - ZOOO, C - 65000, D - 85000.

Table 9

Claims (1)

Claim Composition for dehydration and desalting of oil ³⁵ , including a nonionic demulsifier based on a block of copolymers of ethylene oxide and propylene oxide, a water-soluble nitrogen-containing polymer and water, characterized in that, in order to increase the efficiency of the composition, as a water-soluble nitrogen-containing block copolymer of ethylene oxide th propylene oxide 0.03-0.07 GT product modification of polyethyleneimine urea of the specified formula Water 0.04-0.10 Up to 100 polymer, it contains the product of a modification of polyethylenimine with a urine-guilty formula