WO2008069702A2

WO2008069702A2 - Working member of a bore hole multistage pump (variants)

Info

Publication number: WO2008069702A2
Application number: PCT/RU2007/000686
Authority: WO
Inventors: Alexandr Georgievich Chuyko; Kirill Alexandrovich Chuyko; Anastasia Aleksandrovna Chuyko; Fyarit Fatikhovich Kuzyaev; Andrey Yuryevich Shvetsov
Original assignee: Alexandr Georgievich Chuyko; Kirill Alexandrovich Chuyko; Anastasia Aleksandrovna Chuyko; Fyarit Fatikhovich Kuzyaev; Andrey Yuryevich Shvetsov
Priority date: 2006-12-08
Filing date: 2007-12-07
Publication date: 2008-06-12
Also published as: RU2006143553A; WO2008069702A3

Abstract

The invention relates to multistage pumps for extracting oil from wells. The inventive working member of a downhole multistage pump comprises a working wheel (4) and a guiding unit (5). Said working wheel (4) and a guiding unit (5), each or both, are made either of an aluminium alloy, or steel or iron and are provided with a ceramic Al2O3 coating which is applied to the steel or iron surface and consists of at least two layers. A highly adhesive polymer coating is applied to the ceramic coating. Said invention makes it possible to increase the corrosion stability of the working members, the wearability thereof, to reduce salting deposits, asphaltene-paraffine precipitations, the weight and vibrations.

Description

Working body of a submersible multistage pump

(options)

FIELD OF TECHNOLOGY

The invention relates to devices for the extraction of oil and oil fluids from wells, mainly to multistage centrifugal and centrifugal-vortex pumps for producing reservoir fluid and working in the reservoir pressure maintenance system. The working body of a submersible multistage pump includes an impeller containing a driving and driven disks with blades placed between them, and a guiding apparatus with shaped blades.

BACKGROUND

The current state of the oil industry is characterized by a significant deterioration in the operating conditions of downhole equipment.

There are a lot of factors influencing the operation of electric centrifugal pumping units (ESPs): from the well and pump structures to the processes that take place in the formation itself. The combination of all complications leads to a sharp decrease in the efficiency of the ESP. In this regard, developments aimed at improving pump performance indicators are becoming relevant. The main complicating factors leading to a decrease in the efficiency of the ESP are: gas, water, deposition of salts and asphalt-resin-paraffin deposits (AFS), the presence of mechanical impurities in the fluid extracted from the reservoir, etc.

Due to the fact that the anhydrous period of operation of the wells takes up a small part of the total period, the effect of water on the operation of the ESP starts almost from the moment the well starts. The appearance of formation water in oil leads to a number of complications during the operation of ESP.

In its chemical composition, oil is prone to the formation of emulsions, since it contains active asphaltene emulsifiers and resins. The formation of emulsions is facilitated by clay and sand brought from the surface or from the formation. Since the viscosity and stability of the emulsion depend on the dispersion of water-oil mixtures, and the ESP is one of the best dispersants, an emulsion is formed during the passage of the liquid through the impellers, the viscosity of which can increase by a factor of ten compared to pure oil. The increase in viscosity negatively affects the performance of the ESP.

Another form of complication is the appearance of highly mineralized formation water, which leads to severe corrosion and active scaling in the pump organs. This is due to the high corrosivity of formation water. The combination of high mineralized water and electric current leads to the occurrence of electrochemical corrosion of the metal. If to low bottomhole pressure is added to these factors, then active scaling occurs in the working bodies of the pump.

Another constant companion of oil during its production is gas. When gas enters the pump’s working bodies, gas caverns are formed, the size of which is comparable to the size of the stage channel. In this case, the energy exchange between the impeller and the liquid deteriorates. The fluid particles surrounding the bubble are affected by the ever-increasing difference in fluid pressure and the pressure inside the bubble and move toward its center rapidly. With complete condensation of the bubble, collisions of fluid particles occur, accompanied by an instantaneous local increase in pressure, reaching hundreds of megapascals. This leads to destruction of the surface of the working bodies of the pump. In the produced fluid are various mechanical impurities. These may be salts, fracture products and mechanical impurities brought from the surface during well repairs. The creation of a differential pressure at the bottom of the well leads to a partial destruction of the rock skeleton. Small particles of rock together with the liquid enter the pump and abrasively wear the surfaces of the working bodies.

Due to changes in the geometric parameters of the impellers, due to wear of the surface of the working bodies, and their considerable mass, an imbalance arises and, as a result, this leads to a significant vibration of the ESP. In this case, the pump's own vibration is transmitted almost over the entire length of the production string. Elevated vibration displacements cause alternating stresses in the area of connection of the ESP units with each other, stimulating their destruction at the connection point. As a result, under the influence of vibration, the tightness of the column is violated, and therefore intercolumn flows appear.

Thus, the working bodies of submersible pumps for oil production during their operation are subjected to intensive hydroabrasive wear. This leads, firstly, to a decrease in the pressure in the pump installation, and secondly, to the appearance of increased vibrations, which subsequently lead to a violation of the tightness of the column.

The presence of associated gases in the formation fluid leads to erosion of the surface of the flowing part of the working bodies and, as a result, to an increase in hydrodynamic resistance and a decrease in the pump efficiency.

The presence in the formation fluid of aggressive gases and fluids causes intense corrosion of the working bodies.

The presence of the electrochemical potential, combined with the high aggressiveness of the reservoir fluid and the conductivity of the working bodies, causes intense electrochemical corrosion of the latter.

Due to the electrical conductivity of the material from which the working bodies are made, in the presence of salts in the reservoir fluid, intense salt deposition occurs on the surface of the flowing part of the working bodies. As a result, the cross section of the flow part is clogged and the pressure in the pump is significantly reduced. The surfaces of the working bodies made of metal have a sufficiently high adhesive ability. In the presence of paraffins in the formation fluid in the flowing part of the working bodies, they are intensively deposited. As a result, the channels quickly become clogged and the pressure drops accordingly. The situation is aggravated by the fact that complications do not occur separately. Most often, exploited wells have a whole range of complications that reduce the efficiency of the ESP. One type of complication can lead to new operational problems.

Known technical solutions that are aimed at improving the corrosion resistance, wear resistance, and, as a result, improving the reliability of submersible multi-stage pumps (see, for example, RU 2274769, 04.20.2006; RU 55901, 08.28.2006; RU 54630, 10.07.2006; RU 24517, 08/10/2002).

In known technical solutions, in particular, it is proposed to manufacture the pump impeller from plastic or with a plastic coating or from hardened porous powder material, or from cast iron with a saturated diffusing substance, which provides an increase in corrosion resistance, with a surface layer. However, all these technical solutions do not provide a sufficient increase in corrosion resistance, wear resistance, reliability of a submersible multistage pump. SUMMARY OF THE INVENTION

The technical problem, the solution of which the claimed invention is directed, is:

1. Improving the corrosion resistance of the working bodies of submersible pumps for oil production;

2. 3 protection against electrochemical corrosion of the working bodies of submersible pumps for oil production; 3. Improving the wear resistance of the working bodies of submersible pumps for oil production; 4. Improving the resistance to erosive wear of the working bodies of submersible pumps for oil production;

5. Reduction of scaling in the flowing part of the working bodies of submersible pumps for oil production;

6. Reduction of asphalt-resin-paraffin deposits in the flowing part of the working bodies of submersible pumps for oil production;

7. Weight reduction of submersible equipment;

8. Decrease in vibration of the pump equipment;

9. Increasing the efficiency of pumping equipment. The problem is solved as follows.

In the first embodiment of the invention: The working body (stage) of a submersible multi-stage pump comprises an impeller with a driving and driven disks between which the blades are located, and a guide apparatus, which includes a glass with upper and lower disks, between which the shaped blades are placed. Moreover, all the elements of the working body are made of aluminum alloy or of steel or cast iron coated on a steel or cast-iron surface, an aluminum-based coating, with an Al ₂ O ₃ ceramic coating of at least two layers formed on all the elements.

In addition: - first - the lower barrier layer of the ceramic coating Al ₂ O ₃ has a thickness of from 0.001 μm to 2 μm and a high density of about 100%;

- the total thickness of the ceramic coating Al ₂ O ₃ is in the range from 2 to 1000 microns; - porosity of the upper layers of the ceramic coating Al ₂ O ₃ is in the range from 2 to 50%;

- the pore size is in the range of 0.1 μm to 15 μm.

- the thickness of the coating based on aluminum is from 2 microns to 1000 microns or more. In the second embodiment:

The working body (stage) of a submersible multistage pump contains a driving wheel with a driving and driven disks between which the blades are located, and a guide apparatus, which includes a glass with upper and lower disks, between which the shaped blades are placed. In this case, the impeller is made of aluminum alloy or of steel or cast iron with an aluminum-based coating deposited on a steel or cast-iron surface, and a ceramic coating Al _{2 is} formed on the flowing part of the impeller, which is formed by the inner surfaces of its disks, as well as its blades. O ₃ of at least two layers. Besides:

- first - lower barrier layer of ceramic Al ₂ O ₃ coatings have a thickness of 0.001 μm to 2 μm and a high density of about 100%;

- the pore size is in the range of 0.1 μm to 15 μm.

- the thickness of the coating based on aluminum is from 2 microns to 1000 microns or more. In a third embodiment:

The working body of a submersible multistage pump contains an impeller with a driving and driven disks between which the blades are located, and a guide apparatus, which includes a glass with upper and lower disks, between which the shaped blades are placed. In this case, the guiding apparatus is made of aluminum alloy or of steel or cast iron with an aluminum-based coating deposited on a steel or cast-iron surface, and a ceramic coating is formed on the flowing part of the guiding apparatus, which is formed by the inner surfaces of its glass with disks, as well as its blades. Al ₂ O ₃ from at least two layers. Besides:

- the first is the lower barrier layer of the ceramic coating Al ₂ O ₃ has a thickness of from 0.001 μm to 2 μm and a high density of about 100%;

- the total thickness of the ceramic coating Al ₂ O ₃ is in the range from 2 to 1000 microns; - the porosity of the upper layers of the ceramic coating Al ₂ Oz is in the range from 2 to 50%;

- the pore size is in the range of 0.1 μm to 15 μm.

- the thickness of the coating based on aluminum is from 2 microns to 1000 microns or more.

In the fourth embodiment:

The working body (stage) of a submersible multistage pump contains a driving wheel with a driving and driven disks between which the blades are located, and a guide apparatus, which includes a glass with upper and lower disks, between which the shaped blades are placed. Moreover, all the elements of the working body are made of aluminum alloy or steel or cast iron with an aluminum-based coating deposited on a steel or cast-iron surface, while at the steps a ceramic coating Al ₂ O ₃ of at least two layers is formed, and a ceramic coating is applied polymer coating with high release ability. In addition: - first - the lower barrier layer of the ceramic coating Al ₂ O ₃ has a thickness of from 0.001 μm to 2 μm and a high density of about 100%;

- pore size is in the range of 0.1 μm to 15 μm; - the thickness of the coating based on aluminum is from 2 microns to 1000 MKM or more;

- the polymer coating is a teflon coating. In the fifth embodiment:

The working body (stage) of a submersible multistage pump contains a driving wheel with a driving and driven disks between which the blades are located, and a guide apparatus, which includes a glass with upper and lower disks, between which the shaped blades are placed. In this case, the impeller is made of aluminum alloy or of steel or cast iron with an aluminum-based coating deposited on a steel or cast-iron surface, and a ceramic coating Al _{2 is} formed on the flowing part of the impeller, which is formed by the inner surfaces of its disks, as well as its blades. Oz of at least two layers, and a polymer coating with high release ability is applied to the ceramic coating. Besides:

- the first is the lower barrier layer of the ceramic coating Al ₂ Oz has a thickness of from 0.001 μm to 2 μm and a high density of about 100%;

- the total thickness of the ceramic coating Al ₂ Cb is in the range from 2 to 1000 microns;

- the porosity of the upper layers of the ceramic coating Al ₂ Oz is in the range from 2 to 50%;

- the polymer coating is a teflon coating. In the sixth embodiment:

The step (working body) of a multi-stage submersible pump contains an impeller with a driving and driven disks between which the blades are located, and a guide apparatus, which includes a glass with upper and lower disks, between which the shaped blades are placed. In this case, the guiding apparatus is made of aluminum alloy or of steel or cast iron with an aluminum-based coating deposited on a steel or cast-iron surface, and a ceramic coating is formed on the flowing part of the guiding apparatus, which is formed by the inner surfaces of its glass with disks, as well as its blades. Al ₂ Oz from at least two layers, and a polymer coating with high release ability is applied to the ceramic coating. Besides:

- the total thickness of the ceramic coating Al ₂ O ₃ is in the range from 2 to 1000 microns;

- porosity of the upper layers of the ceramic coating Al ₂ O ₃ is in the range from 2 to 50%;

- pore size is in the range of 0.1 μm to 15 μm; - the thickness of the coating based on aluminum is from 2 microns to 1000 microns or more; Teflon coating is used as a polymer coating. LIST OF DRAWINGS

The invention is illustrated by graphic materials, where in FIG. l shows the working body of a submersible multistage pump, in Fig.2 - the impeller of a submersible multistage pump, in Fig.Z - the guide apparatus of a submersible multistage pump.

The following positions are indicated on these figures:

1. Val

2. 3 protective sleeve

3. Textolite ring 4. P

5. Guiding apparatus

6. Flowing part

7. The flow of formation fluid

8. The driving wheel of the impeller 9. The protective coating of the flowing part of the impeller

10. Impeller blade

11. Impeller driven disk

12. Glass with the upper disk of the guide vane 13. Protective coating of the flowing part of the guide vane

14. The blade of the guide apparatus

15. The lower disk guide device The working bodies can be made of aluminum alloy (the best option), steel or cast iron. In the case of working bodies made of steel or cast iron, their surface is pre-coated with an aluminum alloy (or pure aluminum) due to poor adhesion of the ceramic coating to steel and cast iron.

The bottom layer of the protective ceramic coating Al ₂ O ₃ (the protective coating is indicated by pos. 9, 13 in FIGS. 2 and 3) due to its ultra-high density and exceptional corrosion resistance reliably protects the flow part of the working body from corrosion, in particular from exposure to hydrogen sulfide. The second main working coating layer with a thickness of 2 to 1000 microns has a very high hardness and strength. Moreover, as it deepens into the working layer of the coating, its hardness increases. Its hardness reaches up to 2500 Vickers units. This hardness coating is second only to diamond.

Ceramic coating Al ₂ O ₃ has a very high hydroabrasive wear resistance. It is a dielectric and breakdown voltage is directly proportional to the thickness of the coating. Al ₂ O ₃ coating has a very high corrosion resistance. After grinding the coating, its surface has a very low adhesive ability and a low coefficient of friction. This coating has a very high erosion resistance. The coating has high heat resistance (about 1000 ⁰ C). The thickness of the working layer of the ceramic coating is dictated on the one hand by the required resource for wear resistance, and on the other hand, by economic feasibility. The greater the wear resistance of the coating is required, the larger the coating thickness is selected. For a purely corrosion-resistant design, the minimum coating thickness is selected. If it becomes necessary to apply a coating polymer coating, the thickness of the working layer of the ceramic coating is selected in order to ensure high adhesion of the polymer coating.

To ensure increased resistance to electrochemical corrosion, an increased coating thickness is selected (dielectric properties increase). The smallest porosity of the working layer of the coating and the smallest pore size are selected during the formation of coatings that are corrosion-resistant and wear-resistant, as well as for coatings resistant to scaling.

The increased porosity of the working layer of the coating is selected for working bodies resistant to asphalt-resin-paraffin deposits. In the latter case, a polymer coating having a very high release ability (for example, Teflon) is applied on top of the working coating layer. The increased porosity of the coating, as well as the increased pore size, provides high adhesion of the polymer coating to the main working layer of Al ₂ O ₃ . In this case, the wear resistance of the ceramic coating with increased porosity is reduced. The working parts of the pumps made of ceramic-coated aluminum alloy have a weight of almost three times less than steel or cast-iron. They are not subject to corrosion, wear, deposition of mudflows, paraffins. Due to this, the vibration of pumps with similar working bodies is minimized or eliminated altogether.

The above factors, due to the decrease in hydrodynamic resistance, provide an increase in the efficiency of pumping equipment, and also significantly increases the mean time between failures of the pumps and, therefore, reduces the number of ongoing well repairs.

EXAMPLES OF IMPLEMENTATION OF THE INVENTION Work was carried out on the formation of a ceramic coating of aluminum oxide on the parts of the working bodies of a submersible multi-stage pump according to the method of microarc oxidation. In the electrolytic bath with a slightly alkaline electrolyte, the workpieces were placed and a witness specimen from the aluminum alloy AlMg5Si2Mn was placed. Products and an electrolytic bath were supplied with power from a special current source. As a power source, a specialized inverter source with microprocessor control was used, which provides an accurate setting of the current in the range 0 ... 205 A and its stabilization during the process. In addition, the power supply provided stabilization of the voltage set in the range 300 ... 750 V. Processing was carried out in the anode-cathode mode. The electrolyte was cooled by intensive pumping through a plate heat exchanger. Mixing of the electrolyte was carried out by a special pump with the direction of the jet directly on the workpiece and the witness specimen. The current density was 20 a / dm ² . The processing time was 90 minutes. The electrolyte temperature was maintained in the range 19 ... 21 ⁰ C. After reaching the anode voltage at a load of 620 volts, current stabilization was turned off and voltage stabilization of 620 volts was turned on. When voltage stabilized, the current gradually decreased to almost zero. After that, the power was turned off. Parts were washed and dried. The coating properties were evaluated on a witness sample. According to the described method, the coating was applied to the details of the working parts of submersible multistage pumps in six versions: The first option. A three-layer ceramic coating of aluminum oxide was formed on the impeller and guide apparatus of the working body of a submersible multistage pump made of aluminum alloy. The coating was applied in a continuous layer to the entire surface of the parts except for the current supply points. After the ceramic coating was formed, a polymer coating based on silicone was applied to the current supply points. The first is the lower barrier layer of the Al ₂ Cb ceramic coating, having a thickness of 0.2 ... 0.5 μm and a density close to 100%. The second - the working layer of the coating of aluminum oxide with a thickness of 90-100 microns had a microhardness of 1800 HV and a porosity of 4 ... 5%. The pore size in the working layer of the coating ranged from 0.5 to 12.0 μm. Third, the technological coating layer had a thickness of 40 ... 45 μm, porosity of 20 ... 30%, and surface microhardness of about 600 HV. After washing and drying the coating, the technological layer was removed from the surface of the working body parts. As a result, the details of the working bodies of submersible multistage pumps had a two-layer ceramic coating.

The second option. On the flowing part of the impeller of the working body of a submersible multistage pump made of cast iron with a coating of aluminum alloy with a thickness of 160 μm, a three-layer ceramic coating of aluminum oxide was formed. The first is the lower barrier layer of the ceramic coating Al ₂ O ₃ had a thickness of 0.2 ... 0.5 μm and a density close to 100%. The second - the working layer of the coating of aluminum oxide with a thickness of 90-100 microns had a microhardness of 1800 HV and a porosity of 4 ... 5%. The pore size in the working layer of the coating ranged from 0.5 to 12.0 μm. Third, the technological coating layer had a thickness of 40 ... 45 μm, porosity of 20 ... 30% and a surface microhardness of about 600 HV. After washing and drying the coating, the technological layer was removed from the surface of the working body parts. As a result, the details of the working bodies of submersible multistage pumps had a two-layer ceramic coating.

The third option. On the flowing part of the guiding apparatus of the working body of a submersible multistage pump made of steel with a coating of aluminum alloy with a thickness of 150 μm, a three-layer ceramic coating of aluminum oxide was formed. The first is the lower barrier layer of the ceramic coating Al ₂ O ₃ had a thickness of 0.2 ... 0.5 μm and a density close to 100%. The second is the working coating layer alumina with a thickness of 90-100 microns had a microhardness of 1800 HV and a porosity of 4 ... 5%. The pore size in the working layer of the coating ranged from 0.5 to 12.0 μm. Third, the technological coating layer had a thickness of 40 ... 45 μm, porosity of 20 ... 30% and a surface microhardness of about 600 HV. After washing and drying the coating, the technological layer was removed from the surface of the working body parts. As a result, the details of the working bodies of submersible multistage pumps had a two-layer ceramic coating. The fourth option. A three-layer ceramic coating of aluminum oxide was formed on the impeller and the guide apparatus of the working body of a submersible multistage pump made of steel coated with aluminum with a thickness of 180 μm. The coating was applied in a continuous layer to the entire surface of the parts except for the current supply points. The first is the lower barrier layer of the ceramic coating Al ₂ O ₃ had a thickness of 0.2 ... 0.5 μm and a density close to 100%. The second - the working layer of the coating of aluminum oxide with a thickness of 90-100 microns had a microhardness of 1800 HV and a porosity of 4 ... 5%. The pore size in the working layer of the coating ranged from 0.5 to 12.0 μm. Third, the technological coating layer had a thickness of 40 ... 45 μm, porosity of 20 ... 30% and a surface microhardness of about 600 HV. Then, a fluoroplastic coating was applied over the ceramic coating. The fifth option. On the flowing part of the impeller of the working body of a submersible multistage pump made of cast iron with a coating of aluminum with a thickness of 220 μm, a three-layer ceramic coating of aluminum oxide. The first is the lower barrier layer of the ceramic coating Al ₂ O ₃ had a thickness of 0.2 ... 0.5 μm and a density close to 100%. The second - the working layer of the coating of aluminum oxide with a thickness of 90-100 microns had a microhardness of 1800 HV and a porosity of 4 ... 5%. The pore size in the working layer of the coating ranged from 0.5 to 12.0 μm. Third, the technological coating layer had a thickness of 40 ... 45 μm, porosity of 20 ... 30% and a surface microhardness of about 600 HV. Then, a fluoroplastic coating was applied over the ceramic coating. The sixth option. On the flowing part of the guide apparatus of the working body of a submersible multistage pump made of aluminum alloy, a three-layer ceramic coating of aluminum oxide was formed. The first is the lower barrier layer of the ceramic coating Al ₂ O ₃ had a thickness of 0.2 ... 0.5 μm and a density close to 100%. The second - the working layer of the coating of aluminum oxide with a thickness of 90-100 microns had a microhardness of 1800 HV and a porosity of 4 ... 5%. The pore size in the working layer of the coating ranged from 0.5 to 12.0 μm. Third, the technological coating layer had a thickness of 40 ... 45 μm, porosity of 20 ... 30% and a surface microhardness of about 600 HV. Then, a fluoroplastic coating was applied over the ceramic coating.

Claims

CLAIM

1. The working body of a submersible multistage pump, comprising an impeller with a driving and driven disks between which the blades are located, and a guiding apparatus that includes a glass with upper and lower disks, between which profiled blades are placed, characterized in that all elements of the working body made of aluminum alloy or steel or cast iron with a ceramic coating of Al ₂ O ₃ from at least two layers applied to the steel or cast iron surface of all elements.

2. The working body under item l, characterized in that the first is the lower barrier layer of the ceramic coating Al ₂ O ₃ has a thickness of from 0.001 μm to 2 μm and a high density of about 100%.

3. The working body under item l, characterized in that the total thickness of the ceramic coating Al ₂ O ₃ is in the range from 2 to 1000 microns.

4. The working body under item l, characterized in that the porosity of the upper layers of the ceramic coating Al ₂ O ₃ is in the range from 2 to 50%.

5. The working body under item l, characterized in that the pore size is in the range of 0.1 μm to 15 μm.

6. The working body according to claim 1, characterized in that the thickness of the coating based on aluminum is from 2 μm to 1000 μm or more.

7. The working body of a submersible multistage pump, comprising an impeller with a drive and a driven disc, between which the blades are located, and a guide apparatus, including a glass with upper and lower disks, between which profiled blades are placed, characterized in that the impeller is made of aluminum alloy or steel or cast iron coated with an aluminum-based coating on a steel or cast iron surface, while on the flowing part of the impeller , which is formed by the inner surfaces of its disks, as well as its blades, a ceramic Al ₂ O ₃ coating of at least two layers is formed.

8. The working body according to claim 7, characterized in that the first is the lower barrier layer of the ceramic coating Al ₂ O ₃ has a thickness of from 0.001 μm to 2 μm and a high density of about 100%.

9. The working body according to claim 7, characterized in that the total thickness of the ceramic coating Al ₂ O ₃ is in the range from 2 to 1000 microns.

10. The working body according to claim 7, characterized in that the porosity of the upper layers of the ceramic coating Al ₂ O ₃ is in the range from 2 to 50%.

11. The working body according to claim 7, characterized in that the pore size is in the range of 0.1 μm to 15 μm.

12. The working body according to claim 7, characterized in that the thickness of the coating based on aluminum is from 2 microns to 1000 microns or more.

13. The working body of a submersible multistage pump, comprising an impeller with a drive and a driven disc, between which the blades are located, and a guiding apparatus, which includes a glass with upper and lower discs, between which the shaped blades are placed, characterized in that the guiding apparatus is made of aluminum alloy or of steel or cast iron with an aluminum-based coating deposited on a steel or cast iron surface, while on the flowing part of the guiding apparatus, which is formed by the inner surfaces of its glass with disks, as well as its blades, is formed Ceramic coating Al ₂ Oz of at least two layers.

14. The working body according to p. 13, characterized in that the first is the lower barrier layer of the ceramic coating Al ₂ O ₃ has a thickness of from 0.001 μm to 2 μm and a high density of about 100%.

15. The working body according to p. 13, characterized in that the total thickness of the ceramic coating Al ₂ O ₃ is in the range from 2 to 1000 microns.

16. The working body according to p. 13, characterized in that the porosity of the upper layers of the ceramic coating Al ₂ O ₃ is in the range from 2 to 50%.

17. The working body according to p. 13, characterized in that the pore size is in the range of 0.1 μm to 15 μm.

18. The working body according to item 13, wherein the thickness of the coating based on aluminum is from 2 microns to 1000 microns or more.

19. The working body of a submersible multistage pump, comprising an impeller with a driving and driven disks between which the blades are located, and a guiding apparatus that includes a glass with upper and lower disks, between which profiled blades are placed, characterized in that all elements of the working body made of aluminum alloy or steel or cast iron with an aluminum-based coating deposited on a steel or cast-iron surface; moreover, an Al ₂ O ₃ ceramic coating of at least two layers is formed on the step, and a polymer coating with a high release ability is applied to the ceramic coating.

20. The working body according to claim 19, characterized in that the first is the lower barrier layer of the ceramic coating Al ₂ O ₃ has a thickness of from 0.001 μm to 2 μm and a high density of about 100%.

21. The working body according to claim 19, characterized in that the total thickness of the ceramic coating Al ₂ O ₃ is in the range from 5 to 1000 microns.

22. The working body according to claim 19, characterized in that the porosity of the upper layers of the ceramic coating Al ₂ O ₃ is in the range from 2 to 50%.

23. The working body according to claim 19, characterized in that the pore size is in the range of 0.1 μm to 15 μm.

24. The working body according to claim 19, characterized in that the thickness of the coating based on aluminum is from 2 microns to 1000 microns or more.

25. The working body according to claim 19, characterized in that the polymer coating is a Teflon coating.

26. The working body of a submersible multistage pump, comprising an impeller with a drive and a driven disc, between which the blades are located, and a guiding apparatus that includes a glass with upper and lower discs, between which profiled blades are placed, characterized in that the impeller is made of an aluminum alloy of either steel or cast iron with an aluminum-based coating deposited on a steel or cast-iron surface, while on the flowing part of the impeller, which is formed by the inner surfaces of its disks, as well as its blades, a ceramic Al ₂ O ₃ coating of not less than two layers, and the ceramic coating is coated with a polymer coating with high release ability.

27. The working body according to p. 26, characterized in that the first is the lower barrier layer of the ceramic coating Al ₂ O ₃ has a thickness of from 0.001 μm to 2 μm and a high density of about 100%.

28. The working body according to p, characterized in that the total thickness of the ceramic coating Al ₂ O ₃ is in the range from 5 to 1000 microns.

29. The working body according to p, characterized in that the porosity of the upper layers of the ceramic coating Al ₂ O ₃ is in the range from 2 to 50%.

30. The working body according to p, characterized in that the pore size is in the range of 0.1 μm to 15 μm.

31. The working body according to p, characterized in that the thickness of the coating based on aluminum is from 2 microns to 1000 microns or more.

32. The working body according to p, characterized in that the polymer coating is a Teflon coating.

33. The working body of a submersible multistage pump, comprising an impeller with a drive and a driven disc, between which the blades are located, and a guide apparatus, including a glass with upper and lower disks, between which profiled blades are placed, characterized in that the guiding apparatus is made of aluminum alloy or steel or cast iron with an aluminum-based coating deposited on a steel or cast iron surface, while on the flowing part of the guiding apparatus which is formed by the inner surfaces of its glass discs, as well as its blade is formed a ceramic coating of Al ₂ Oz at least two layers, and the ceramic coating is polymeric e coating with high anti-adhesion power.

34. The working body according to p. 33, characterized in that the first is the lower barrier layer of the ceramic coating Al ₂ O ₃ has a thickness of from 0.001 μm to 2 μm and a high density of about 100%.

35. The working body according to p. ZZ, characterized in that the total thickness of the ceramic coating Al ₂ O ₃ is in the range from 5 to 1000 microns.

36. The working body according to p. ZZ, characterized in that the porosity of the upper layers of the ceramic coating Al ₂ O ₃ is in the range from 2 to 50%.

37. The working body according to p. ZZ, characterized in that the pore size is in the range of 0.1 μm to 15 μm.

38. The working body according to p. ZZ, characterized in that the thickness of the coating based on aluminum is from 2 microns to 1000 microns or more.

39. The working body according to p. ZZ, characterized in that the polymer coating is a Teflon coating.