RU71112U1 - INSTALLATION FOR PREPARATION OF DRINKING QUALITY WATER FROM WELL PRODUCED FROM PLASTIC WATER WELLS - Google Patents

Abstract

The utility model relates to the field of water treatment and can be used to prepare drinking water from produced formation water from wells using membrane technologies in order to improve the state and preserve human health and protect the environment, which classifies it as a priority strategic development area in Russian "Health of the nation." The technical result achieved by the claimed utility model consists in increasing the efficiency of treatment to drinking quality, as well as in reducing the cost of the entire technological cycle and reducing the complexity in the treatment of formation water. The claimed installation for the preparation of drinking-quality water from produced formation water from wells allows us to consider them no longer as undesirable sewage polluting the environment, but, on the contrary, to consider produced production water from wells, as an essential reserve of drinking-quality water, which is not only treatable , but also at the exit they fully comply with environmental standards, without requiring unnecessary capital costs and uneconomic operating costs. It can be assumed that the application of the claimed utility model will make it possible in the near future to approach the goal set by international organizations to achieve zero hazardous discharge and, at the same time, to solve the problems of preparing drinking-quality water from produced formation water from wells.

1 n.p. f-ly; 4 tab., 2 ill.

Description

The utility model relates to the field of water treatment and can be used to prepare drinking water from produced formation water from wells using membrane technologies in order to improve the state and preserve human health and protect the environment, which classifies it as a priority strategic development area in Russian "Health of the nation."

A known installation and method for the purification of liquid effluents containing, in particular, in suspension suspended pollutants (1), comprising means for separating the gravitational action and means for membrane separation used at the stage of final cleaning. However, the known installation has a limited scope and provides a low quality of treatment - for liquid effluents with suspended contaminants.

Known automatic complex for the purification of oily wastewater type (2), which is intended for physico-chemical purification of oily wastewater. The automatic complex contains a means for supplying source water, pre-treatment units, collectors and pipelines for returning pre-treated source water, an automatic control unit for the cleaning process. However, the well-known automatic complex is designed according to its technology for wastewater treatment and, at the outlet, the purified water does not achieve drinking quality.

Known thin-walled sump (3), intended for the treatment of produced water, however, with this device, the original produced water is purified only from suspended particles, and therefore the degree of purification to the drinking quality is not achieved.

A known flotator (4), intended for the treatment of industrial and domestic wastewater, however, the degree and quality of the source water treatment is low, since only proteins, fats, oil products are removed from the source water,

surfactants and other impurities, which does not provide a sufficient quality of water treatment before drinking.

A known installation for the treatment of produced water (5), the closest in solving the technical problem to the claimed utility model and selected as a prototype. The known installation, which is based on the sequential clarification of the source water, allows the purification of oil-containing formation water to drinking quality, however, the degree of purification of formation water in a known installation allows the removal of oil-containing products in it to a content of not more than 15 mg / l, which is insufficient for receiving at the exit of water of high potable quality.

The technical result achieved by the claimed utility model consists in increasing the efficiency of treatment to drinking quality, as well as in reducing the cost of the entire technological cycle and reducing the complexity in the treatment of formation water.

The specified technical result is achieved using a new original technical solution in the form of an installation for the preparation of potable water from produced produced water from wells containing a contact clarifier, in which, in accordance with the claimed utility model, the contact clarifier is connected, on the one hand, through a pipeline having fittings for supplying flocculent chemicals, with a sump with a blank vertical partition, the height of which is below the level of the upper edge of the sump tank, on the other hand, a contact clarifier is connected through a high pressure pump to reverse osmosis membrane units, and a sump is connected to an inclined flotator, in the upper part of the initial chamber of which oil-containing formation salt water enters.

In addition, the specified technical result is achieved by the fact that the contact clarifier has a gravel load.

In addition, this technical result is achieved in that the flotator has at least 10 flotation chambers.

At the same time, this technical result is achieved in that the pipeline connecting the contact clarifier and the settler has at least 1 meter from the entrance to the contact clarifier, fittings for supplying flocculating chemicals in an amount of at least 4 before leaving the settler.

The proposed utility model is illustrated in FIG. 1 and FIG. 2, in which, in the form of a diagram, an installation is presented for preparing potable water from produced formation water from wells.

The claimed utility model for water treatment and water purification is carried out in two stages.

The first stage for the preparation of drinking-water quality, presented in the form of a diagram in FIG. 1, is based on two-stage flotation and includes the following installation elements: pipeline 1 with a fitting for supplying formation (mine) water for treatment with a counter 2 recording the volume of water supplied to the treatment , a mixer 3 with a tank 4 for soda solution and a pump 5 for pumping it out, a flotation machine 6, in which the first 5 chambers purify water from oil products, and on the next second 5 chambers soften and alkalize water; a lime mortar mixer 7 and a metering pump 8 for supplying it, a pump sump system 9, 10 for pumping contaminants, 11 for pumping purified water by flotation, 12 for pumping insufficiently purified water, pump system 13 for pumping clean water at the “storage”, 14 - for pumping contaminated water to the sump tank and oil trap, 15 - for pumping insufficiently purified water sump pump 9, 16 - for pumping purified water by flotation to the boiler room, sump tank 17 connected to the tank for collecting oil 1 8, to which the pump 19 delivers flotated water, a sump 20 of the pump pumping water to the “storage”, an oil trap 21 located between the sump and the tank for collecting oil, a set of pumps: 22 for pumping oil for transportation, 23 for sludge, 24 for pumping clean water, 25 for pumping sludge, 26 for pumping water for re-treatment, a car with a tank 27 for oil removal, sump 28 of the pump pumping water for re-treatment.

The second stage for the preparation of drinking water quality, presented in the form of a diagram in Figure 2, is based on the subsequent upholding of the purified source water, coagulation and final treatment of produced water from wells using membrane technology - the reverse osmosis method, and includes the following elements: first section 29 of the sump tank 17, pipe 30, through which water purified from flotation is supplied to the tank of sump 17, the second section of the tank of sump 17, pipe 31 with sludge supply fittings, contact clarifier 33, a water collecting tank 34, a compressed air supply system 35, a pump 36 for pumping water to a contact clarifier to flush it, a water flow meter 37, a stirrer 38 for preparing a coagulant solution, a high pressure pump 39 for supplying water after cleaning on a contact clarifier , metering pump 40 for supplying a coagulant solution, reverse osmosis membrane blocks 41, pipe 42 for purified water (for

consumers), pipeline 43 with a fitting for draining into the sewer, to the contact clarifier, a pump 44 for pumping purified water to the contact clarifier.

The operation of the installation for the preparation of potable water from the produced produced water from wells is as follows.

In the first stage (Figure 1).

The source of produced formation water from the wells along the pipeline 1 is supplied through the meter 2, which records the volume of the source water, to the flotation machine, sequentially first to the first five chambers of the flotation machine 6, then to the second five chambers of the flotation machine 6; From the soda solution tank 4, a soda solution is supplied by a pump 5 through a soda solution mixer 3 and a lime solution is supplied through a lime mixer 7 using a metering pump 8. Contaminants through sump No. 1 of pump 9 and sump No. 2 of pump 10 are directed to the sump tank 17 or to the oil trap 21. Using pump 13, clean water is pumped to the “storage” through the sump of pump 20 and pump 24. The contaminated water is pumped through pump 14 sump 17 to the tank and then to the oil trap 21. The insufficiently purified water from the flotation machine 6 is pumped to pump 24 by the pump 24. Oil products recovered at the flotation stage are sent to the oil collection tank 18 and pump 22 is pumped to the car tank for oil transportation 2 7. The water 21 purified in the oil trap is sent to the sump of the pump pumping water to the flotation machine 6 and re-cleaning 28 and is pumped out by the pump 26 for re-cleaning. The sludge formed in the tank of the sedimentation tank 17 is sent to the “storage" 23 by the pump 25.

The oil-containing formation salt water 30 purified at the flotation stage through the sump of the pump 16 is fed to the first section of the settling tank 29, after which it is sent to the second section of the settling tank 31. The sludge formed in the settling tank 17 is sent to the “storage” 32. After the settling stage, the saline reservoir water pump 44 through the flow meter 37 are supplied to the contact clarifier 33. When flushing the contact clarifier 33 is supplied through the compressed air system 35 to the pipeline connecting the contact clarifier 33 and the second section of the sump tank 31, having at least 1 meter from the entrance to the contact clarifier 33 fittings; from the mixer 38 for the preparation of a coagulant solution, the pump 40 feeds flocculating chemicals. The water purified on the contact clarifier 33 is supplied to the tank of purified water 34. The water supplied by the pump 36 to the contact clarifier 33 for washing it is sent to the sewer 43. From the tank of the water collector 34, water is supplied through a high pump

pressure 39 is supplied to the reverse osmosis membrane unit 41, after which the purified boiler and potable water is pumped to consumers 42.

The treatment of produced water is currently one of the pressing global problems in the oil industry. At the same time, the trend in the world is such that environmental requirements for emissions are being tightened. Therefore, a search is needed for more and more new technologies that could efficiently clean produced water produced from wells to the level of drinking quality. As you know, more stringent environmental requirements for the quality of drinking water are increasing: for example, new initiatives - the Convention for the Protection of the Marine Environment in the North-East Atlantic, the Kyoto Agreement and others have led to a review of environmental requirements already within the industry as applied to oil emissions. The main goal pursued by all new technologies and devices aimed at water purification is to achieve a zero approximation in the content of oil in the initial purified water and the minimum presence of solid particles, hardness salts and other pollutants.

The inventive utility model is aimed at achieving such a result.

The following are examples of specific implementations of the proposed installation.

Production tests were carried out at the enrichment plant of the Production Maintenance Department of LUKOIL-Komi LLC, located on the industrial areas of the oil mine No. 3 of the LUKOIL-Ukhtaneftegaz TPP LUKOIL-Komi LLC in 2007, with the aim of developing the most optimal and low-cost constructive technical solutions of the main units of the installation and the connections between them to ensure optimal operating conditions and a high degree of purification of the source produced formation water from wells.

Examples of testing the claimed installation for the preparation of drinking-quality water from produced formation water from wells.

Example 1

Multiple tests of a plant for the preparation of potable water from produced formation water from wells showed the need for a two-stage operation of a standard flotator, since the results of testing showed that the presence of a flotator with less than 10 flotation chambers in the installation at the initial stage does not provide a sufficient degree of reduction in the reservoir water of oil products and hardness salts, therefore, through its numerous experimental tests with different quantities of the fleet ion chambers best option was selected skimmer comprising at least 10 flotation cells,

which are conditionally divided into two stages, each of which contains the optimal number of flotation chambers (at least five).

Table 1 shows the results of repeated tests, as a result of which the optimal number of flotation chambers, conditionally divided into two stages, was found. As can be seen from table 1, an insufficient number of flotation chambers leads to a slight decrease in the content of oil products from produced formation water from wells.

Table 1 No. p / p The oil content, mg / DM ³ Source formation water Water after treatment on a flotator with less than 10 flotation chambers Water after treatment on a flotator having 10 flotation chambers one 107.36 48.45 4.8 2 53.67 48.65 3.74 3 102.84 47.35 3,55 four 20.61 13.14 3.63 5 149.64 77.35 2.08

Example 2

Subsequent experimental studies and tests of produced formation water cleaned after flotation chambers simultaneously produced from wells were carried out in a sump in which for at least 60 minutes. clarification of the test water was observed, constantly during the tests flowing through the upper part of the blind partition installed below the upper level of the sump, which facilitated the effective deposition of mechanical impurities and suspensions visually well observed at the bottom of the sump.

Table 2 shows the results of testing, which clearly demonstrate the need for a blank partition in the sump, which allows, after 60 minutes, to visually observe the clarification of formation water.

table 2 Min time Brightening Area (visual) 10 not observed twenty not observed thirty not observed

40 slight lightening fifty lightening at the top 60 full volume clarification

Example 3

Further tests of pre-cleaned formation water after the flotator and sedimentation tank were carried out in a contact clarifier, where it was supplied under pressure through a pipeline connecting the settler to a contact clarifier. The presence of at least 4 fittings in the pipeline made it possible to introduce periodic dosing of flocculating chemicals into the inlet piping, which contributed to an overall increase in the efficiency of further purification due to intensive flocculation. Through repeated experiments, it was possible to find the optimal location of the fittings at a distance of not less than 1 meter from the entrance to the contact clarifier and their location at approximately equal distance from each other on the remaining length of the pipeline to exit the sump. This design allowed us to achieve high quality water treatment for purification of oil from the source formation water to a level of less than 0.05 g / m ³ (in comparison, for example, with the prototype, which this indicator is much lower - not more than 15 g / m ³ ).

Example 4

The produced water obtained after the contact clarifier had, according to the test results, a high purification quality, however, to bring it to the drinking level, a further testing was carried out at the next stage of the claimed installation for the preparation of potable water from produced produced water from the wells by directing the treated water through pipeline to high-tech membrane systems in which it was brought to final purification (drinking quality) by reverse osmosis.

Tables 3 and 4 show the results of studies, from which it follows that the initial formation water after two stages and final treatment by reverse osmosis corresponds to the required high quality indicators of drinking water.

Table 3 Source formation water Titanium Coagulant Water Water after final cleaning

07/07/2007 reverse osmosis Total stiffness, mg * equiv / dm ³ 56.0 24 0.11 The residual iron content, mg / DM ³ 4.17 0.29 0.15 Permanganate oxidation, MgO ₂ / dm ³ 10.08 4.32 4.0 Color, hail. - 5.54 0.92 Turbidity, EMF - 1,54 0.52 Petroleum products, mg / DM ³ 107.36 <0.05 <0.05 Table 4 Source formation water Water treated with a titanium coagulant 07/27/2007 Water after final treatment by reverse osmosis Total stiffness, mg * equiv / dm ³ 56.0 twenty 0.08 The residual iron content, mg / DM ³ 4.17 0.13 0.02 Permanganate oxidation, mgO ₂ / dm ³ 10.08 4.0 4.0 Color, hail. - 1,69 0.92 Turbidity, EMF - 0.83 0.52 Petroleum products, mg / DM ³ 107.36 <0.05 <0.05

In accordance with the results obtained, it can be concluded that there is a real possibility of preparing drinking-quality water from produced formation water from wells, in particular, using the tested waters of the Yarega field as an example to drinking-water.

As can be seen from the research results, at the flotation stage, there is a stable decrease in the content of petroleum products on average from 29-105 mg / l to 3.55-4.00 mg / l (the efficiency of reducing the content of petroleum products to 96.2%) and a decrease in overall hardness water on average from 56 mg equiv / l to 24 mg equiv / l (the efficiency of reducing stiffness is 57.2%). The water prepared at the flotation stage is suitable for further processing on a contact clarifier.

From the results of the tests it is seen that during the preparation of water on the contact clarifier there is a stable decrease in the content of suspended solids, color and turbidity of the tested water. The main positive result is a decrease in the content of petroleum products to less than 0.05 mg / l (the efficiency of reducing the content of petroleum products is 99%), which allows for the supply of treated formation water to a reverse osmosis unit (where the main requirement for water quality is the minimum content of petroleum products). In addition, during the preparation of water at the reverse osmosis unit, a steady decrease in all the main indicators below the regulated norms is observed.

The claimed installation for the preparation of drinking water of produced quality from produced formation water from wells allows us to consider them not as undesirable sewage polluting the environment, but, on the contrary, to consider produced produced water from wells of wells as an essential reserve of drinking quality water, which is not only treatable , but also at the exit they fully comply with environmental standards, without requiring, what is very important, excessive capital costs and uneconomical operating costs. It can be assumed that the application of the claimed utility model will make it possible in the near future to approach the goal set by international organizations to achieve zero hazardous discharge and, at the same time, to solve the problems of preparing drinking-quality water from produced formation water from wells.

Used Books:

1. PCT Application: FR 03/00627 (02/26/2003); WO 2004/083132 (09/30/2004)

2. RF patent No. 22235069

3. RF patent No. 2230595

4. RF patent No. 2301775

5. The journal "Oil of Russia", No. 6, 2007 (prototype)

Claims (4)

1. Installation for the preparation of drinking-quality water from produced produced water from wells, comprising a contact clarifier, characterized in that the contact clarifier is connected on one side through a pipeline having fittings for supplying flocculent chemicals, with a sump with a blank vertical partition, the height of which below the upper edge of the sump housing, on the other hand, the contact clarifier is connected via a high pressure pump to reverse osmosis membrane units, and the sump is connected water with an obliquely located flotator, in the upper part of the initial chamber of which oil-containing formation salt water enters. 2. Installation according to claim 1, characterized in that the contact clarifier has a gravel load. 3. Installation according to claim 1, characterized in that the flotator has at least 10 flotation chambers. 4. Installation according to claim 1, characterized in that the pipeline connecting the contact clarifier and the settler has at least 1 m from the entrance to the contact clarifier fittings for supplying flocculating chemicals in an amount of at least 4 nozzles before exiting the settler .