RU145055U1 - PRESSURE FLOTATOR-DEGASATOR (OPTIONS) - Google Patents

Abstract

1. A pressure flotator-degasser comprising a housing sequentially divided by baffles into interconnected chambers, phase state destabilizers, a multiphase mixture inlet pipe and separated phases output pipe, characterized in that it is provided with a feed pipe installed with the possibility of horizontal input of the multiphase mixture to normally ascending the flow of the part of the latter supplied through the inlet pipe, and made in the form of paired inlet pipes of another part of the supplied flow of the multiphase mixture, each minutes of which is provided with a destabilizer phase state, configured to control the multiphase flow smesi.2. A flotator-degasser according to claim 1, characterized in that the housing is configured to form a flotation chamber, settling, buffer and gas zones. A flotator-degasser according to claim 1, characterized in that it is provided with a pipeline for supplying the separated gas from the gas zone of the housing to each phase state destabilizer. The flotator-degasser according to claim 1, characterized in that it is equipped with a tray for collecting the flotation product and a receiving chamber for collecting and outputting the captured oil. The flotator-degasser according to claim 1, characterized in that the gas outlet pipe is equipped with a dropping liquid trap made in the form of a coalescing block.

Description

This utility model relates to the oil industry and is intended for use at oil treatment facilities to perform the process of purifying incidentally produced formation water from oil products and mechanical impurities before pumping purified formation water into injection wells of the reservoir pressure maintenance system.

A flotator is known from the prior art (Patent RU No. 2301775, IPC C02F 1/24, published June 27, 2007) comprising a rectangular housing with paired parallel plates, between which perforated pipelines for supplying the air-water mixture are placed, the initial sections of which are in communication with the formation of air-water mixtures, a mechanism for removing foam with a foam collector and a node for the output of treated water with a receiving pocket.

The disadvantages of this flotator include low productivity and the impossibility of its use in a pressure water treatment system within the oil field for the treatment of produced water.

A pressure flotator is also known (Patent for invention No. 2049732, IPC C02F 1/24, publ. 10.12.1996) containing a container with an internal cylindrical partition, flotation, settling and filtering chambers, a device for supplying a water-air mixture equipped with an ejector, a supply pipe and outlet pipe for purified liquid.

The design of the known pressure flotator is cluttered with complex design elements, which reduces the working volume, and, accordingly, the performance of the apparatus as a whole is reduced. There is also the need to use additional equipment in the form of a pump and a pressure tank with compressed air, which leads to the complexity of operation and control of the separated phases.

Closest to the claimed utility model is a flotator containing a housing sequentially divided by partitions into interconnected chambers, phase state destabilizers (hereinafter referred to as DFS), sewage water inlet and purified water outlet pipes (RF patent No. 2349553, IPC C02F 1/40, published on March 20, 2009). The body of the known flotator includes a receiving chamber, several successively arranged impeller flotation chambers, two successively arranged water settling chambers, mixing chambers of air-water mixture supplied from a special saturator, purified water collection chambers, foam product removal units from the water surface from impeller flotation chambers and from settling chambers located on the outside of one of the sides of the case, which consist of pivoting trays, scrapers and side pockets.

The disadvantages of the known flotator, taken as a prototype, are the complexity and clutter of the metal structures of the flotator, which includes several flotation chambers with DFS (impeller air dispersers), two water settling chambers with nozzle blocks placed in them, foam product removal units of complex design and many partitions of various types, which generally complicates preventive maintenance, increases the intensity and cost of the device.

Also, the disadvantages of the known flotator include:

- the complexity of the selection and adjustment of the process, since to determine the flotation parameters, it is necessary to determine the number of impellers, speed and diameter of the impellers;

- the use of impeller air dispersants requires the use of electricity, as well as their periodic maintenance, which increases operating costs.

The technical task of the proposed utility model is to create an apparatus capable of increasing the efficiency of water purification and the quality indicators of its purification from oil products and mechanical impurities and meeting the set requirements for the quality of water treatment before injection into injection wells.

The technical result from the use of the proposed utility model consists in increasing the efficiency of formation water purification by providing the ability to control the flow rate of a portion of the water flow supplied to the pressure flotator-degasser body through a DOS by ejecting (supplying) the separated gas from the gas zone of the housing to the DFS, and also through the use of an effective system for collecting and removing from the hull fleet sludge and trapped oil.

The task underlying the present utility model, with the achievement of the claimed technical result, is solved by the fact that the pressure flotator-degasser containing the housing, successively divided by partitions into interconnected chambers, phase condition destabilizers, a multiphase mixture inlet pipe and separated phase output pipes, is equipped with a feed pipe installed with the possibility of horizontal input multiphase mixture normally upward flow of the last part supplied through the input pipe, and in complements a paired branch pipes enter another portion of the feed stream of multiphase mixtures, each of which is provided with a destabilizer phase state, adapted to regulate the flow of a multiphase mixture.

In addition, the housing is configured to form a flotation chamber, settling zone, buffer and gas zones.

In addition, the pressure flotator-degasser is equipped with a pipeline for supplying the separated gas from the gas zone of the housing to each phase state destabilizer.

In addition, the pressure flotator-degasser is equipped with a collection tray for collecting the flotation product and a receiving chamber for collecting and outputting the captured oil;

In addition, the gas outlet pipe is equipped with a dropping liquid capture device made in the form of a coalescing block.

The installation in the flotator-degasser of the pressure feed port with the possibility of horizontal injection of the multiphase mixture to the normally upstream part of the latter fed through the input nozzle, and its execution according to the first embodiment in the form of paired input nozzles of the other part of the feed stream of the multiphase mixture, each of which is equipped with DFS, made with the ability to control the flow rate of a multiphase mixture, it provides an optimal pressure drop between the pressure of the incoming mixture stream and the working pressure in the apparatus, Qdim for effective flotation process.

The supply of the flotator-degasser with a pressure pipe for ejecting (supplying) the separated gas from the gas zone of the body to the DFS with a low gas content in the input stream of the multiphase mixture ensures its optimal gas content for an efficient flotation process (when the gas content is low, the efficiency of the flotation process decreases sharply).

The supply of the flotator-degasser of the pressure head with the collection tray for collecting the flotation product (foam product) and the receiving chamber for collecting and removing the trapped oil provide for efficient collection of the flotation product and the subsequent removal of the separated trapped oil.

The listed features are significant and interconnected with the formation of a stable set of essential features sufficient to obtain the specified technical result.

A comparative analysis of the proposed technical solution with identified analogues of the prior art, from which the utility model does not explicitly follow for a specialist in the field of oil preparation for the process of purification of produced produced water from oil products and mechanical impurities, showed that it is not known, but taking into account the possibilities of industrial serial production of a pressure flotator-degasser, we can conclude that it meets the criteria of patentability.

The present utility model is illustrated by a specific example of the implementation of a pressure flotator-degasser, which clearly demonstrates the possibility of obtaining the specified technical result. Various modifications and improvements are allowed that do not go beyond the scope of the utility model defined by the attached formula.

A pressure flotator-degasser is described below on the basis of the drawings, where:

- figure 1 shows a General view of a flotator-degasser pressure;

- figure 2 shows a view along arrow A in figure 1;

- figure 3 shows a section bB in figure 1.

In graphic materials, the corresponding structural elements of a pressure flotator-degasser are indicated by the following positions:

1 - housing;

2 - phase state destabilizer (DFS);

3 - flow control device multiphase mixture;

4 - feeding pipe to enter part of the multiphase mixture to DFS;

5 - pipe input part of the multiphase mixture in the flotator;

6 - pipe outlet purified water;

7 - gas outlet pipe;

8 - device for capturing droplet liquid;

9 - pipe outlet for catching oil;

10 - pipe output heavy phase from the receiving chamber of the captured oil;

11 - pipeline for supplying gas to the DFS;

12 - valve;

13 - primary overflow partition;

14 - tray for collecting flotation product (flotation sludge);

15 - overflow comb of the collecting tray 14;

16 - a receiving chamber for collecting and outputting trapped oil;

17 - a partition of the settling zone;

18 - a device for collecting and removing captured oil;

19 - a device for collecting and removing purified water;

20 - secondary overflow partition;

21 - pipe output heavy phase;

22 - input device multiphase mixture.

The pressure flotator-degasser contains a horizontal cylindrical body 1 with elliptical bottoms, separated by primary 13 and secondary 20 overflow baffles with the formation of a flotation chamber (I), settling zone (II), buffer (III) and gas (IV) zones, multiphase input pipe 5 mixture, feed pipe 4 for introducing part of the multiphase mixture to DFS 2, pipes 6, 7, 9, 10 and 21 of the output of the separated phases, pipe 11 for supplying the separated gas from the gas zone of the housing to each DFS 2, tray 14 for collecting the flotation product and receiving chamber 16 for boron and outputting the collected oil.

The pipe 7 of the gas outlet is equipped with a device 8 for capturing the droplet liquid, made in the form of a coalescing block.

The feed pipe 4 for introducing a part of the multiphase mixture is installed with the possibility of its horizontal input to the normally upward flow of the other part of the multiphase mixture fed through the nozzle 5 of the input to the flotator, equipped with DFS 2, configured to control the flow of the multiphase mixture, before the input of which the output of a special pipeline 11 is connected for supplying gas to the DFS 2. In this case, the feeding pipe 4 is made in the form of paired pipes for introducing part of the supplied flow of the multiphase mixture, each of which is equipped with DFS, Making a adjustably multiphase mixture flow

Flotation degasser pressure head works as follows.

The total flow of the multiphase mixture (water, oil, solids) supplied to the housing 1 for cleaning is divided into several streams. Part of the flow enters the housing through the inlet pipe 5 for supplying a part of the multiphase mixture (produced water) equipped with the device for inputting the latter 22, part of the flow enters the phase state destabilizer (DFS) 2 through the inlet pipe 4 for supplying the part of the mixture. Through DFS 2, the water mixture with gas, which is the working agent, enters the lower part of the flotation chamber (I). By reducing the working pressure in the apparatus, the dissolved gas is separated by the jet of the incoming stream entering through the nozzle of the DFS 2, and the cavitation is simultaneously applied by the incoming stream to the volume of formation water contained in the flotation chamber. Depending on the initial operating conditions (inlet pressure, flow rate), one or more DFS is used with the corresponding arrangement of the DFS working unit with supply pipes. The difference in pressure between the inlet flow pressure and the operating pressure in the apparatus is maintained in the range of 2-5 kg / cm ^{2 by} adjusting the flow area of the nozzle of the DFS device 3 mixture flow control. Due to the influence of these factors, an efficient removal of contaminants (oil and mechanical impurities) to the gas bubbles forms on the water surface with the formation of a flotation product on the water surface - a foam containing impurities (hereinafter referred to as slime). The necessary initial gas content in the processed mixture to perform an effective flotation process should be in the range of 100-500 l / m ³ . Depending on the parameters of the flotation process, the size of the gas bubbles can be in the range from 0.5-3 mm. With a low initial gas content in the mixture, the valve 12 is opened on the pipe 11 connecting the gas zone of the apparatus and one or more DFS. In this case, ejection dispersion occurs, based on crushing of the gas phase coming from the gas zone of the apparatus. The dispersion process occurs when interacting with a turbulized jet, carried out in vivo on the DFS included in the work. From the flotation chamber, water and flotation sludge through the upper part of the primary overflow partition 13, without mixing, enters the settling zone (II). Sludge from the surface of the water through the overflow comb of the collecting tray 15 enters the tray 14 to collect the sludge and with the simultaneous separation of oil from it enters the receiving chamber 16 of the caught oil. As the product accumulates in the oil collection chamber, the trapped oil is discharged from the housing through the device 18 for collecting and discharging the trapped oil and the outlet pipe 9 of the trapped oil. The water stream after separation of the sludge enters under the lower part of the oil collection chamber and the partition 17 of the settling zone and, overflowing through the secondary overflow partition 20, which maintains a constant water level in the settling zone, enters the buffer zone (III) for degassing. The purified water from the buffer zone of the casing is discharged through a pipe 6 equipped with a purified water output device 19 located in the lower part of the buffer zone. The separated gas during the flotation process and the separated gas in the buffer zone enter the gas zone (IV) and are discharged through a pipe 7 equipped with a dropping liquid capture device 8, which is a coalescing block consisting of perforated grids installed in series in an inclined tray. Condensate generated during the passage of gas through the drip trap device drains along the inclined plane of the tray and flows by gravity into the buffer zone of the apparatus through the outlet pipe.

The manufacture of the proposed pressure flotator-degasser does not require the development of new equipment and the re-equipment of existing facilities, and the tools used are widely used in petroleum engineering, which confirms the possibility of practical implementation and achievement of the technical result.

Claims (5)

1. A pressure flotator-degasser comprising a housing sequentially divided by baffles into interconnected chambers, phase state destabilizers, a multiphase mixture inlet pipe and separated phases output pipe, characterized in that it is provided with a feed pipe installed with the possibility of horizontal input of the multiphase mixture to normally ascending the flow of the part of the latter supplied through the inlet pipe, and made in the form of paired inlet pipes of another part of the supplied flow of the multiphase mixture, each minutes of which is provided with a destabilizer phase state, adapted to regulate the flow of a multiphase mixture. 2. Flotator-degasser according to claim 1, characterized in that the housing is configured to form a flotation chamber, settling, buffer and gas zones. 3. The flotator-degasser according to claim 1, characterized in that it is equipped with a pipeline for supplying the separated gas from the gas zone of the housing to each phase state destabilizer. 4. Flotator-degasser according to claim 1, characterized in that it is equipped with a tray for collecting the flotation product and a receiving chamber for collecting and outputting the captured oil. 5. The flotator-degasser according to claim 1, characterized in that the gas outlet pipe is equipped with a dropping liquid trap made in the form of a coalescing block.