RU1824418C - Method of extracting bitumen from bitumen-containing rock - Google Patents

Abstract

SUBSTANCE: bitumen-containing rocks are mixed with water containing sodium silicate at a mass ratio of rock and water equal to 1: 4.00-2.33, subjected to cavitation treatment in recirculation mode with a multiplicity of 3-5 in a private range of 10-60 Hz, 1 silt. , 1 tab.

Description

The invention relates to methods for recovering bitumen from bitumen-containing rocks (BSP) and can be used in the oil and refining industries.

The purpose of the invention is to reduce the density of recoverable bitumen and reduce energy costs.

The method is carried out as follows.

From a bitumen-containing rock and water containing an addition of sodium silicate, a suspension is prepared in a ratio of 1 -. (4.00-2.33), respectively. The resulting suspension is additionally subjected to cavitation treatment with a multiplicity of 3 to 5 at a temperature of 5-65 ° C. in this case, the suspension flow recirculates in the mode of cavitation self-oscillations in the frequency range of 10-60 Hz.

To implement the proposed method, the technological scheme shown in the drawing is used.

Technological scheme for the extraction of bitumen and: bt includes storage

hopper 1, device for pumping slurry 2, cavitation-cumulative treatment chamber 3, shut-off and control device 4.7. sump 5. recirculation loop 6.

An aqueous suspension of BSP is fed into the storage hopper 1, from where, using the device 2, the suspension is pumped into the chamber 3 for cavitation-cumulative treatment in the mode of cavitation self-oscillations. During cavitation treatment behind pulsating supercavities, which are formed in the device 2 and closed in the chamber 3. a floor of cavitation microbubbles arises, upon collapse of which super-high-speed cumulative microjets are formed. Microblows, colliding with BSP particles, separate bitumen adsorbed on the particle surface. Sodium silicate processing aid reduces the surface tension at the water-bitumen interface, which prevents back adsorption of extracted bitumen. At the same time, cumulative jets influence

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act on extracted bitumen, destroying supramolecular formations, which is accompanied by a decrease in the density of the extracted bitumen. The suspension processed in the cavitation mode is fed through the shut-off control device 4 to the sump 5. The recirculation ratio is controlled by a recirculation loop 6 equipped with a shut-off control device 7. The extracted bitumen floats to the surface. It is collected and analyzed.

PRI me R 1, for the implementation of the method using:

Bitumen-containing rock of the Mortuk deposit with a bitumen content of 14.2 wt.%, Water - 0.7 wt.%, The rest is the mineral part, represented by fine-grained sand with a particle size modulus of 0.29.

Water that meets the requirements of GOST 23732-79.

Liquid glass (sodium silicate) with a silicate module 1.6-1.8 according to GOST 13078-81.

The technological additive liquid glass in an amount of 80 g in terms of dry sodium silicate is mixed with 1520 g of water. 1600 g of sodium silicate solution was mixed with 400 g of BSP until a slurry formed. The resulting slurry at a temperature of -65 ° C is subjected to cavitation treatment at a cavitation frequency of 10 Hz. The cavitation treatment recycle rate is 5. The treated slurry is sedimented. The bitumen that has surfaced is removed, adjusted to constant weight in a vacuum oven and its density determined.

Example 2. For the extraction of bitumen from BSP, the materials and raw materials described in Example i were used.

Liquid glass in an amount of 140 g in terms of dry sodium silicate is mixed with 1260 g of water. BSP in an amount of 660 g is mixed with 1400 g of sodium silicate solution until a slurry forms. The resulting slurry at a temperature of + 40 ° C is subjected

cavitation treatment at a frequency of cavitation oscillations of 40 Hz. The cavitation treatment recirculation ratio is 4. The spent sludge is settled. The bitumen that has surfaced to the surface is removed, brought to a constant weight in a vacuum oven and its density is determined.

Example 3. To extract bitumen from BSP, the materials and raw materials described in Example 1 were used.

Liquid glass in an amount of 200 g in terms of dry sodium silicate is mixed with 800 g of water, BSP in an amount of 1000 g 5 is mixed with 1000 g of a solution of sodium silicate. The prepared sludge at a temperature of +5 C is subjected to cavitation treatment at a frequency of cavitation oscillations of 60 Hz. The cavitation treatment recirculation ratio is 3. The sludge after treatment is sedimented. The bitumen which has surfaced to the surface is removed, adjusted to constant weight in a vacuum oven and its density determined.

The table shows the effect of the cavitation treatment regimes of BLB on the density of extracted bitumen.

From the obtained data it follows that the use of the proposed method makes it possible to reduce the density of extracted bitumen from BSP.

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Claims (1)

SUMMARY OF THE INVENTION A method for recovering bitumen from bitumen-containing rocks by preparing a suspension of the source rock with water containing a sodium silicate additive in a mass ratio of rock: water of 1: 4.00-2.33, characterized in that, in order to reduce the density extracted bitumen and reduce energy consumption, the suspension is additionally subjected to cavitation treatment in the recirculation mode with a multiplicity of 3-5, in the frequency range of 10-60 Hz. Comparative values of the density of bitumen, selected by the proposed and known methods 7 r 1 /