Device for cleaning oil-bearing waters and effluents. RU patent 2506230.

IPC classes for russian patent Device for cleaning oil-bearing waters and effluents. RU patent 2506230. (RU 2506230):

C02F1/40 - TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE (processes for making harmful chemical substances harmless, or less harmful, by effecting a chemical change in the substances A62D0003000000; separation, settling tanks or filter devices B01D; special arrangements on waterborne vessels of installations for treating water, waste water or sewage, e.g. for producing fresh water, B63J; adding materials to water to prevent corrosion C23F; treating radioactively-contaminated liquids G21F0009040000)

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FIELD: process engineering.

SUBSTANCE: invention relates to oil-bearing effluents treatment and can be used for treatment of oil field effluents used in system for maintaining seam pressure at oil field flooding. This device comprises main tank, perforated pipelines, one to feed oil contact mass in water supply layer and another one intended for discharge, arranged at the tank top and bottom parts, respectively. Besides, said device incorporates extra tank composed of two parts. First part is equipped with hydrophobic filter arranged horizontally, sealed and locked along the perimetre, and feed perforated pipe arranged downstream of the filter. Second part is equipped with water discharge pipe at bottom section. Note here that said first and second parts are communicated above extra tank while main tank water discharge pipe communicates with extra tank feed pipe. Main tank and extra tank feed pipe are communicated under contact mass layer via appropriate valves and accessories with hydrocarbon solvent feed pipe.

EFFECT: higher quality of water and oil yield.

1 dwg

The invention relates to the field of preparation of oil field waste water used in the system for maintaining reservoir pressure at waterflooding of oil deposits, including the productive reservoirs with low permeability, and is used for treatment of oily wastewater from oil and mechanical impurities.

A device for oily water treatment (RF patent 2104736, IPC B01D 17/02, C02F 1/40, publ. 20.02.1998, bul. №5), including the cylindrical body, divided by partitions into three chambers: the upper layer of oil products, the middle and bottom, pipes supplying water to the clearance, discharge of treated water and removal of oil products and coalescing element.

The disadvantage of this device is a short lifespan used fibrous materials (in secondary camera and element of the system of pipelines - , in the lower chamber - ). Production practice of application of these materials has shown that their use is appropriate in the processes of allocation of water low viscosity of oil products with a minimum content of mechanical impurities. However, the wastewater of the oil processing industry, as a rule, contain a significant amount of mechanical impurities, and when coalescence, there is partial stratification of oil products viscosity, rapid pollution load and dramatically increases the resistance through the download. Regeneration fibrous download is very difficult, and in some cases without extraction from its installation is practically impossible, therefore, for cleaning oily waste such materials are not widely spread. Because the claimed invention is not worked out the issues associated with regeneration of used fibrous materials, the life of the device will be short-lived.

Closest to the claimed a device for cleaning oily waste water (utility model Russian Federation of 38 633, IPC B01D 17/022, publ. 10.07.2004, bul. №8), including capacity with a layer of contact mass of oil, horizontal perforated and ventilated drainage piping installed in the upper and lower parts of the vessel respectively.

The drawbacks of such a device are the low degree of purification from oil products and low operational reliability, as in purified water remain fine drops of oil. Field experience shows that while filtering wastewater through a layer of oil effectively trapped particles of contamination measuring only more than 20 microns, and the concentration of residual oil is reduced only to the interval 40-60 mg/DM 3 , solids - 30-50 mg/dm3 . The quality of treated water is not enough for efficient use, for example, when injected in poorly permeable productive horizons, which has considerable residual recoverable oil reserves.

Technical tasks of the proposed devices are increasing and stabilizing the water quality during long-term operation and eventually reducing the loss pickup reservoirs and increase of oil recovery.

Technical problems are solved proposed device for cleaning oily waste water, including primary receptacle horizontal perforated layer in the contact mass of oil and ventilated drainage piping installed in the upper and lower parts of the vessel respectively.

What is new is that the device has extra capacity, consisting of two parts, the first equipped with hydrophobic filter set with sealing and fixing around the perimeter, and supplying a perforated pipe, installed below the filter, and the second - the drainage pipe at the bottom, and the first and second parts communicated on top of additional capacity and ventilated drainage main pipeline capacity communicated with the intake pipe of additional capacity, the primary receptacle below the layer of the liaison mass of oil and the inlet branch of additional capacity through appropriate valves communicated with the pipeline for the supply of hydrocarbon the solvent.

The drawing shows a diagram of the device for treatment of oily waters in the axial section.

Device for treatment of oily waters includes basic capacity of 1, perforated in the horizontal plane layer in the contact mass of oil 2 line 3, located in the upper part of the vessel 1, perforated in the horizontal plane ventilated drainage pipeline 4, located in the lower part of the vessel 1, an additional capacity of 5, consisting of two parts, the first of which is hydrophobic filter 6 (for example, porous-foamed polymeric material)equipped with sealing and fixing around the perimeter, and supplying perforated pipe 7 is installed below the filter 6 and the second - the drainage pipe 8 in the lower parts; the first and second parts are connected via the message 9 top additional capacity 5. Ventilated drainage pipeline 4 main tank 1 communicated with the intake pipe 7 additional capacity 5. In addition, the device consists of a socket (10) allotment of collected oil from the top of the additional capacity 5, nipple 11 diversion of oil from the bottom of the main container 1, controlling socket 12, pipeline 13 (shown conditionally) for filing a hydrocarbon solvent through valves 14 regeneration hydrophobic filter 6, through a shut-off valve 15 - regeneration layer 2 filtering oil mass, drainage socket with 16 - to remove sediment.

The design can be executed as a single unit, and as a primary and secondary capacity stand-alone versions (not shown).

The device works as follows.

Treated water goes to the basic capacitance of the 1, layer filtering oil mass 2 line 3. In the layer 2 oil is separated oil particles and mechanical impurities. Further pre-treated water from the bottom of the reservoir 1 through the pipeline 4 and outlet 7 enters the first part of the additional capacity 5 and sent to the hydrophobic filter 6. When the water passes through the filter 6 residual drops of oil escalated, forming a film petroleum, which is reaching critical thickness, comes off the filter material 6 under the flow of water, POPs up in the upper part of the additional capacity 5 and periodically displays from the device via the pipe 10 allotment of trapped oil. Purified water through the message 9 flows into the second part of the extra capacity 5 and is drawn through the pipe 8 discharge of treated water.

Oil is periodically removed from the main tank 1 through pipe 11 before the appearance of the water. The accumulation layer 2 control via socket 12 and, if necessary, through him, the same removed to exclude increase its thickness. The sediments are removed through the tube 16.

Design features of the proposed devices allow periodically regeneration material hydrophobic filter 6 by removing suspended solids and viscous components of the oil from the surface of the material hydrocarbon solvent (for example, gasoline fraction allocated by distillation or separation of oil, which is used as a solvent paraffins when flushing oil wells). Regeneration is carried out without stopping the device periodic dosing of 13 through the pipeline valves 14 hydrocarbon solvent in the flow of water supply for cleaning. The frequency of regeneration depends on the quality of treated waste water, supplied to the input device, and refined in the process of exploitation.

Field tests have shown that washing hydrophobic filter 6 hydrocarbon solvent is the most effective, technologically acceptable and inexpensive way of regeneration. It is established that the optimum mode of regeneration is achieved when the ratio of the volumes of submission of solvent and water 1:20 for 30 min, that at least 2 times less time cleaning the closest analogue.

To improve work effectiveness layer filtering oil mass 2 periodically is recommended to be served from 13 through the pipeline valves 15 hydrocarbon solvent, which is an additional material and, getting in the oil layer, improves its activity.

This solution allows to provide a high degree of clearing oily waste. Oil concentration in purified water is less than 20 mg/DM 3 , solids - less than 10 mg/DM 3 , which satisfy the requirements for injection into reservoirs even with low permeability. The use of the proposed device allows to exclude the instantaneous discharge pollutants in the reservoir pressure maintenance system and eventually reduce the loss of injection wells and increase oil recovery and regeneration of material hydrophobic filter dosing hydrocarbon solvent directly in the stream without interrupting the operation of the device allows to achieve stable quality of the purified water for a long period.