Method of destruction-resistant oil emulsion

 

(57) Abstract:

The invention relates to the preparation of oil and water emulsions and oil-sludge treatment and trap oils. Method of destruction of persistent oil emulsions is carried out by introducing into the emulsion of demulsifier type block copolymer of ethylene oxides and propylene in mixture with the reagent and water, followed by heating and stirring. The introduction of water in the emulsion is carried out before the introduction of demulsifier. As the nonionic demulsifier use Disolve 4490, and as a reagent -(1-oxo-9-octadecenyl)--hydroxy-poly(oxy-1,2-amandil). Additionally impose trisodium phosphate - Na3RHO4. The ratio of wt. % respectively of 1:1.5:3,0. Preferably use produced water. The heat are up to 60oC. Technical result is an increase penetration resistant oil emulsions, simplification of the method and the possibility of recycling waste oil. 2 C.p. f-crystals, 4 tab., 3 Il.

The invention relates to the preparation of oil and water emulsions and oil-sludge treatment and trap oils, in particular to methods of destruction of highly stable oil emulsions, stabilized by a large number myway emulsion Zhirnovsky oil. In laboratory experiments could be obtained almost complete destruction of stable emulsions containing up to 1.5 wt.% mechanical impurities, adding saline water to the total content of 80 vol.%. Consumption of demulsifier was 100 g/t, the process temperature is 50-60oWith time settling - 1,0-2,0 am Positive results were obtained and without dosage of demulsifier when you add in the salt wash water, acid or alkali in amounts providing pH, respectively, 4 and 10 units (see 1 - Mitrofanov, A. H. , Giniyatullin I. I. Dehydration persistent emulsions method of treatment phases //Oilfield business. - 1981. - 7, - S. 30-32; 2 - development of technology for the dehydration produced emulsion in zhernovskom NGDU: Report /Volgogradnipineft; project Manager A. H. Mitrofanov - order 0136201.703.0147501.82.3861. - Volgograd, 1983, - 96 C.).

There is a method of dehydration and desalting of crude oil, in order to increase the demulsifying activity used songs it contains components in the following ratio, wt. %: non-ionic demulsifier based blockcopolymer oxides of ethylene and propylene 5-7; Las 6-8; sodium tetraborate 2.0 to 2.5; water to 100 (see 3 - patent of the Russian Federation 1416507, IPC With 10 G 33/ fresh water, followed by heating and stirring. As the demulsifier used oil soluble demulsifier type blockcopolymer oxides of ethylene and propylene, based on Ethylenediamine mixed with reagent-based sulfonate, for example, ML-72 and a light gasoline distillate, taken in an amount of 0.15-0.3 kg/t of oil, 1,0-2,0 kg/t of oil and 80-100 kg/t of oil, respectively. Introduction fresh water is carried out after the introduction of demulsifier before reaching the water content of the emulsion 80-90 wt.%. Heating the resulting emulsion is conducted to a temperature of 5-15oWith higher temperature to the beginning of the boil (see 4 - RF Patent 1360185, IPC With 10 G 33/04, BI 18, 1994).

The disadvantage of this method is that when using the compositions of the reagents effective destruction of stable oil emulsion, which represents the oil sludge is a mixture of trap and barn oils with a high content of mechanical impurities, is not achieved.

In the oil fields of significant amounts of these products accumulate in the formation of so-called persistent intermediate emulsion layers formed in settling devices due to their concentration at the interface oil-water. Trap oil are substandard products - emulsions vermieten layers. Barn oil is a waste of storage of intermediate layers and trap oils. Oil sludge is concentrates oil from mechanical impurities after repeated processing of the above types of non-conforming products on the oil treatment plants. Negative role resulting in the preparation of oil such emulsion systems boils down to the fact that the oil industry loses up to 5% of valuable hydrocarbons by losses in non-conforming products. Due to the high stability of these emulsions mechanical impurities from the oil phase separated completely, thereby inhibiting effective system is separated into three phases: oil, water and solids.

The task of the invention is to increase the depth of destruction of persistent oil emulsions, simplification of the method of destruction and disposal of oil waste by involving them in quantities of raw materials to final goods production.

The problem is solved by the method of destruction of persistent oil emulsions by introducing a nonionic demulsifier type blakesophiey oxides of ethylene and propylene in mixture with the reagent and the addition of water for irrigation emulsion, heating and stirring. Pricemoney Disolve 4490, as reagent -(1-oxo-9-octadecenyl)--hydroxy - poly (oxy-1,2-amandil) and impose additional trisodium phosphate - Na3PO4when the ratio of wt.% respectively of 1:1.5:3,0. Way feasible when using produced water for irrigation emulsion heated to 60oC.

The method is as follows. Samples of stable oil emulsion was collected from open containers - layered oil storehouses with a time gap of approximately 1 month. The studied emulsions can be classified not only as a reverse emulsion type, i.e.,/M, but "multiple" (Fig.1). So in the dispersed phase (usually water) dispersed droplets of oil and particles of mechanical impurities, which gives the system an emulsion-suspension in nature. Sample advanced Obvodny up to 80 vol.%, enter nonionic demulsifier Disolve 4490, -(1-oxo-9-octadecenyl)--hydroxy-poly(oxy-1,2-amandil)-Aleex-5 and trisodium phosphate. Then the sample components are thoroughly mixed. Mixed mixture is heated to a temperature of 60oWith traditionally used in the commercial preparation of oil, and defend. Oil and separated water is subjected to physico-chemical analysis.

Characteristics investigated emulsi the torus-type block copolymer of ethylene oxides and propylene (see 5 - Pozdnyshev, N. Stabilization and destruction of oil emulsions), Nedra, 1982, S. 73); Aleax-5- -(1-oxo-9-octadecenyl)--hydroxy-poly (oxy-1,2-amandil), molecular weight of 503, the number of saponification 108-120 mg KOH/g, products HLB=8,6,17H33SOO(C2H4O)5N (see 6 - TU 6-14-314-85); trisodium phosphate - Na3PO4, tPL= 1340oC, a component of detergents, textile auxiliary substance (see 7 - Chemical encyclopedia), Owls. Encyclopedia, 1983, S. 363).

Specific example: test stand oil emulsion were selected from open containers - layered oil storehouses of oil sludge processing unit (NSHU 1) JSC "totalgaz" JSC "Tatneft". Emulsion is a high viscosity (20=1159-6m2/s at 20oC) and a highly concentrated mixture containing 1326 mg/l iron sulfide, 59 wt.% water, 16532 mg/l of salt and a large number of mechanical impurities 2.52 wt. %. Linkage of each sample taken for demulsification, 100 ml samples of the emulsion to impose an additional water - 35,6 ml, up to a total oil water cut 80 vol.%, the oil-soluble demulsifier type Disolve 4490 - 400 g/t, Aleax-5 - 600 g/t and trisodium phosphate - 1200 g/T. Then sampled with the entered components carefully peremeci is UP>oWith and defend within 2 hours. Oil and separated water is subjected to physico-chemical analysis. The viscosity of the processed emulsion after introducing the reagent solution and water, heating and mixing with 115910-6m2/s dropped to 2410-6m2/s On the dynamics of sludge - water separation from oil, residual content in oil, water, salt, iron sulfide and solids - appreciate the depth of destruction of persistent oil emulsions. The failure conditions of the emulsion, the amount of the reagents, and the results are shown in table. 2, 3.

When used in the method of destruction of stable oil emulsion mixtures of Disolved 4490 and Aleax-5, taken from the total specific consumption of 1000 g/t at different ratios, was installed a synergistic effect in their joint action. In Fig. 2 and 3 presents the dependence of the changes of the surface-active properties of the compositions of the reagents on their ratio and the results of the demulsification of oil sludge 1. They show that the composition containing 40% oil-soluble demulsifier, Disolve 4490 and 60% water-soluble Aleax-5, has a complex surface-active properties not inherent to each of the reagents alone. From asenio to disperse particles of natural emulsifiers and mechanical impurities, and the function of the destruction of the structural-mechanical barrier on the book covers of the globules of water in the oil due to displacement of the stabilizers of the phase boundary. By its nature, the particles of iron sulfide, being hydrophobic, are able to bind molecules of the reagents of demulsifiers on its developed surface, while reducing the overall activity of the composition. To reduce aggregate stability of the emulsion and, therefore, move a certain part of the iron sulfide in the water used in the method, the composition comprises trisodium phosphate at a ratio of reagents in the composition of Disolved 4490 : Aleax-5 : alkaline agent, wt.%, respectively of 1:1.5:3. The change in the ratio of reactants is not possible to solve the problem, because the residual water content, salinity, iron sulfide and mechanical impurities after the destruction of the emulsion, the oil does not meet the requirements of GOST 9965-76. In table. 4 shows the results of demulsification of oil sludge 1 using three compositions containing various alkali agents. The results show that the composition on the basis of trisodium phosphate can effectively destroy persistent oil emulsion with the oil return required quality.

the possibilities of heat exchangers and heating furnaces, used in field conditions. At temperatures below 60oWith the proposed method will be less effective due to the high viscosity of the emulsion systems. The destruction of persistent oil emulsions at temperatures above 600With allows to intensify the process of demulsification of oil. However, more stringent temperature is also not desirable due to high energy costs for heating raw materials, as well as large losses of light hydrocarbon components of crude oil in the degassing.

The analysis of the results shows that using the proposed method allows to effectively destroy persistent oil emulsion, and get out of non-conforming products commodity oil with a low content of residual water, salts, solids and iron sulfide.

1. Method of destruction of persistent oil emulsions by introducing a nonionic demulsifier type block copolymer of ethylene oxides and propylene in mixture with the reagent and adding water for irrigation emulsion with heating and stirring, characterized in that the introduction of water produced before the introduction of demulsifier, as nonionic demulsifier use Disolve-4490, ka is ripoff - PA3RHO4when the ratio, by weight.dollars., 1:1,5:3,0 respectively.

2. The method according to p. 1, characterized in that the irrigation of lead produced water.

3. The method according to p. 1, characterized in that the heat are up to 60oC.

 

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