Oil desalination method

FIELD: oil industry.

SUBSTANCE: method includes mixing water-oil emulsion with drain water in line of inlet of first electric hydrator by dispersing drain water in volume 8-15% from volume of prepared oil at temperature 40-50°C. As washing water drain water is used from same oil deposit with mineralization less than saturation limit.

EFFECT: higher efficiency.

1 ex

 

The invention relates to the oil industry and can be used in the desalting of crude oil.

A known method of removing chlorine-containing impurities by elektroobessolivaniya (Dneven, Nverge, Nmichael. "The technology of desalting of crude oil in refineries", s-96. M.: Chemistry, 1985). Crude oil was put into her demulsifier is heated in the heat exchanger 60-140°and together with the wash water served in the dehydrators. Distilled water with dissolved salts, drain, and oil at the outlet of the desalter mix with fresh wash water, served in the dehydrators second stage, where we conduct the same operations as in the dehydrators of the first stage. Of dehydrators second stage the water drain and the oil guide or in refineries part of the installation or transported to consumers.

Depending on the initial salt content in oil, its viscosity and other factors, as well as the type of equipment used, the process temperature ranges from 60-80 to 100-140°C. In this case the residual salt content in oil also varies from 5 to 25 mg/L.

The known method comprehensive removal of chlorine-containing compounds from petroleum (Vdeerev, Tea and other "automation System for removal of chlorine-containing compounds from oil e is the OS", in Proc. of the altered labor market demands Refining and petrochemicals", 1984, No.1, p.44-45). Desalting according to this method is carried out in three stages at a temperature of 90-100°With each. The peculiarity of this method is that at the second stage, the oil is mixed with the emulsion of the recirculated flow of oil and aqueous solutions of alkali 20%-year and 2%concentration and sludge is subjected to separation of the aqueous phase.

This method allows to reduce the content of mineral and organic chlorine compounds in the oil, however, the process conditions do not allow for such cleaning with sufficient depth. When further refining this leads to the decomposition of the impurities with the release of hydrogen chloride and thus to accelerate corrosion of process equipment.

The closest to the proposed invention the technical essence is a method of desalting of crude oil, according to which the oil is subjected to desalting by multistage elektroobessolivaniya installation. On the first stage of oil, heated to 95°C, mixed with demulsifier and wash water, and then separating the water-salt layer, then the oil is mixed with 1%aqueous alkali, heat up to 30-80°higher than the first stage, and directed to electrodesiccation second stage, where the separated aqueous phase (RF patent No. 2065477, publ 1996.08.20 - p is totip).

The known method does not allow to achieve a high degree of desalting of crude oil.

The invention solves the problem of increasing the degree of desalting of crude oil.

The task is solved in that in the method of desalting of crude oil, comprising a mixture of a water-oil emulsion wash with water and desalting in dehydrators, according to the invention as wash water use waste water from the same oil reservoir with a salinity of less than the saturation limit, the mixing is carried out in the inlet line in the first electrodesiccation the dispersion of effluent volume 8-15% of the volume of produced oil at a temperature of 40-50°C. features of the invention are:

1. The mixture of water-oil emulsion wash water.

2. Desalination in dehydrators.

3. Use as wash water waste water from the same crude oil.

4. Same with a salinity of less than the limit of saturation.

5. The mixture in the inlet line in the first electrodesiccation.

6. The same dispersion of waste water.

7. The same in the amount of 8-15% of the volume of produced oil.

8. The same at a temperature of 40-50°C.

Signs 1 and 2 are shared with the prototype, signs 3-8 are the salient features of the invention.

The invention

When desalting strive to achieve the greatest is to remove salts. Existing methods of desalting not allow to achieve a high degree of demineralization. In the proposed method solves the problem of increasing the degree of desalting of crude oil. The problem is solved as follows.

When desalting mix oil emulsion wash with water and carry out desalting in dehydrators. It is considered that for desalting may be better suited for fresh water. Studies have shown that the degree of demineralization increases, if the wash water use waste water from the same oil field, which has an affinity to oil, good compatibility and high density. When this prerequisite is the salinity of the wastewater is less than the limit of saturation. In this case, the waste water is able to absorb the salt produced from oil.

For the best combination of waste water and oil mixing is carried out in the inlet line in the first electrodesiccation the dispersion of waste water. The amount of sewage selected optimal 8-15% of the volume of produced oil. The process temperature is 40-50°C.

In the result it is possible to increase the salt content in the oil to the desired rate at the outlet of the intermediate desalter. Achieved degree of demineralization allows you to disable and bring in the reserve NESCO what are the dehydrators, that gives substantial savings in energy, maintenance (repair, cleaning etc) and increase the service life of these devices. Application of sewage water prevents the installation of free oxygen, thereby significantly slowing the rate of corrosion of equipment and valves. The process of separating water from oil when washing waste water goes faster than the supply of fresh water. The process of dissolution of salts from the oil in the native formation water is harder.

Specific example

Pilot tests of the method were carried out in NGDU “djalilneft” Dusanovsky training setup sour Romashkinskoye oil field. The unit has four desalter volume of 200 m3each connected in series. Install allows you to desalting 3000 tons of oil-water emulsion in the day. Produce supply wastewater Romashkinskoye field density of 1012 kg/m3through disperser into the line input of oil-water emulsion in the first electrodesiccation. The content of chloride salts in the waste water is 120 000 mg/l In the chemical analytical laboratory NGDU “djalilneft were conducted laboratory studies to determine the degree of saturation of salts from the waste water. To 100 ml of wastewater was added 30 g of the crystal is about sodium chloride, which under stirring for 15 min completely dissolved. Thus, waste water used in the technology for desalination of oil is not saturated solution.

The water content of oil-water emulsion is up to 1.5%, temperature -50°C. the Flow rate of waste water is from 5 to 15 m3/h, which is equivalent to 8-15% of the volume of produced oil. As a result of washing the oil analyzed by the method of desalting was achieved to the desired residual chloride salts of 300 mg/l after the second desalter.

When using fresh water instead of the waste to the desired residual chloride salts of 300 mg/l reached on the fourth of desalter.

The application of the proposed method will allow for a greater degree of desalting of crude oil.

Method of desalting of crude oil, comprising a mixture of a water-oil emulsion wash with water and desalting in dehydrators, characterized in that the flushing water use waste water from the same oil reservoir with a salinity of less than the saturation limit, the mixing is carried out in the inlet line in the first electrodesiccation the dispersion of effluent volume 8 - 15 % of the volume of produced oil at a temperature of 40 - 50°C.



 

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SUBSTANCE: method includes mixing water-oil emulsion with drain water in line of inlet of first electric hydrator by dispersing drain water in volume 8-15% from volume of prepared oil at temperature 40-50°C. As washing water drain water is used from same oil deposit with mineralization less than saturation limit.

EFFECT: higher efficiency.

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