RU2626636C2 - Method for cleaning tubing and device for its implementation - Google Patents

Abstract

FIELD: machine engineering.

SUBSTANCE: cleaning method includes the action of a jet of low-temperature plasmatron plasma on the surface to be cleaned, gasification and thermal dissociation of the purification products and their subsequent recombination into the simplest molecules of water and carbon dioxide, relative movement of pipes and plasmatrons. The outer surface of the pipe is cleaned with jets of low-temperature plasmatron plasma until melting of the boundary layer between asphaltene deposit inside the pipe and the inner wall of the pipe. The deposits are then removed from the interior of the pipe. After this, a jet plasmatron is injected into the tubing or a pipe is rolled over the jet plasmatron with the possibility of thermodynamic action of the plasma jet on the inner surface of the tubing. The cleaning products of the inner surface of the pipe are extracted through the free end of the pipe to which the gas conduit is connected with the possibility of pumping liquid and gaseous cleaning products of the tubing interior into it.

EFFECT: cleaning of the inner and outer surfaces of tubing with a minimum of waste and environmentally friendly.

27 cl, 6 dwg

Description

Technical field

The invention relates to the field of surface treatment and cleaning of oil equipment, for example, sucker rods and tubing (tubing) after their use before defectoscopy and repair.

The method can be widely used in the repair of sucker rods and tubing in the oil and gas industry.

State of the art

Of the currently used methods for cleaning the surface of oil equipment products, the most common are mechanical, chemical, electrochemical and thermal methods.

Among the mechanical ones, the following can be noted.

1. Methods based on the use of water and steam under pressure at a temperature of 900-1000 ° C (ed. Certificate. No. 141843; 208651; B21B 45/08, 1962; RF patent No. 1674689, B21B 45/02, 1988; US patent No. 2442485, B21B 45/02, 1948, etc.).

2. Methods based on the use of compressed air (ed. Certificate. No. 105495, B24C 3/16, 1956; No. 1609627, B24C 3/16, 1989, etc.).

3. Methods based on cooling products to the embrittlement temperature of oil coatings and their further mechanical removal (ed. Certificate No. 648293, B08B 3/10, 1975; No. 1712006, B08B 9/02, 1992; RF patent No. 2060063, B08B 9/02, 1992, etc.).

The disadvantages of these methods, and all other methods based on the use of needle cutters, brushes, cutters, etc. are low quality and cleaning efficiency at high cost.

Among the chemical and electrochemical methods, the following should be noted.

1. A method comprising treating the surface of products with an organic solvent, for example gasoline, followed by wiping the treated surface with a soft rag (ed. Certificate No. 870505, C23G 5/02, 1981; EPO patent No. 294245, C23F 3/00, 1988 ) The disadvantages of the method include the toxicity of gasoline, its explosion and fire hazard, which exclude widespread use in technological processes.

2. A method based on the use of hydrochloride (ed. Certificate. No. 790629, C23G 5/00, 1991; Bartle D., Mudrokh X. Technology of chemical and electrochemical surface treatment of metals. M., 1961). The process is conducted in a sealed chamber, and after its completion, the product is dried at a temperature of 100-120 ° C until the chloral hydrate is completely evaporated. The disadvantages of the method are its complexity and the need for special equipment, as well as low availability and high price of the reagent used.

3. A method comprising sequential treatment in an organochlorine solvent and an aqueous solution (ed. Certificate. No. 440450, 1518412.1792454, etc.).

4. Methods involving solutions of acids, alkalis or salts (ed. Certificate No. 1388461, C23G 3/00, 1986; No. 17691819, C23G 3/00, 1990; Fireproof technical detergents. M., 1983, etc.) .

5. A method comprising treating the surface of products in an environment of vapors containing hydrogen chloride obtained from the reaction mixture (ed. Certificate No. 1781323, C23G 5/00, 1989; 461167, C23G 5/02, 1972; No. 382776, C23G 5 / 00, 1970).

Units and equipment that implement these methods require significant production space. Evaporated during etching, vapors are not only harmful to service personnel, but also have a destructive effect on production equipment and workshop structures. In addition, the need to dispose of waste acid and alkali requires additional costly measures to prevent environmental pollution. Other methods and devices for treating and cleaning the surface of metal products are known (ed. Certificate of the USSR No. 171056, V23K 9/00, 1963; 476041, V08V 1/00, 1973; 719710, V08V 3/10, 1977; 935141, V08V 3/10, 1980; No. 1272725, C22B 9/10, 1985; 1695704, C23C 14/02, 1987; 1770420, C23B 9/20, 1990; 1812239, C23C 14/02, 1990; RF patents No. 2030232, B21B 45/04, 1990; 2034094, C23C 8/36, 1993; US patents No. 5143561, B21B 45/06, 1992, French patent No. 2664510, B21B 37/08, 1992, Stiblenko V.P., Sitnikov I.V. The use of high-frequency arc discharge of atmospheric pressure for cleaning and activation of metal surfaces. Plasma technology. Collection of scientific papers. Kiev , 1990, etc.).

The analogue closest to the invention in terms of essential features is the method and device described in RF patent No. 2171721 "Method for surface treatment of products and a device for its implementation", priority of 02.23.1999, sponsored by E.S. Senokosov, A.E. Senokosov, V.I. Dikarev and E.E. Nikitina.

According to the analogue, the cleaning of oil equipment (sucker rods, tubing, etc.) from hydrocarbons (oil, paraffins, asphaltenes), sand, mineral deposits, oxides and other contaminants is carried out by rough mechanical cleaning, followed by heating them in vacuum chambers, applying vibration to them for shaking off contaminants, cleaning the surface with arc discharges, when the items to be cleaned are cathodes, with the collection of contaminants in an inclined bottom.

Described in the prototype method and device have several significant disadvantages:

- the use of vacuum for cleaning oil equipment is expensive, requires highly qualified staff and is dangerous if the vacuum cavities are filled with hydrocarbon vapors;

- they do not provide high performance due to the cyclical nature of the process (loading, evacuation, cleaning, air inlet and reloading);

- the use of rods and tubing as cathodes during their cathode-arc cleaning is fraught with the danger of uncontrolled and undesirable surface hardening by cathode spots with the formation of martensitic structures.

Of all the analogues, the closest to the invention in terms of essential features is the RF patent for utility model “Machine for cleaning the outer surface of pipelines” No. 143764, priority date 08/09/2013, authors: Fokin G.A., Sivokon V.N. , Ilyin N.E. and others. According to this patent, pipe surface cleaning is carried out by high-speed plasma flows from flare or jet plasmatrons. In this case, any contaminants located on the surface of the pipes, under the influence of high-temperature plasma jets, melt, gasify and are removed from the surface by the stream of the jet. For cleaning, one or more plasmatrons can be used that move above the surface being cleaned.

The disadvantages of the prototype is:

- in the process of cleaning the surface there is a lot of waste in the form of fragments of the old coating, which must be disposed of separately;

- using a prototype it is impossible to clean the internal cavity of pipes of small diameter, for example tubing;

- in the prototype it is not possible to clean the pipes environmentally friendly, it is difficult to catch the volatile and gaseous waste of treatment;

- low productivity;

- high cost of cleaning.

All these disadvantages are eliminated in the present invention.

SUMMARY OF THE INVENTION

The proposed cleaning method and a device based on it allow the cleaning of tubing inside and out with a minimum of waste, environmentally friendly.

Pump rods and tubing are very important elements in the extraction of oil and gas from the deep layers of the Earth. Their strength and reliability ensures the rhythm of oil and gas production. Their repeated reuse after repair determines the cost of oil and gas, since they are included in their cost. Therefore, the aim of the invention is to increase the cleaning performance of sucker rods and NTK during repair, to ensure high strength and reliability of these products and to reduce the cost of repair of tubing and sucker rods, to eliminate contamination of the plant and workshop with cleaning waste, to exclude the use of water for cleaning tubing, to eliminate the possibility of an explosion and fire from light fractions of paraffin, highly efficiently clean tubing of any diameter and length. The proposed method and device can significantly increase the degree of automation of the installation for cleaning tubing and reduce the number of staff.

According to the proposed method and device for cleaning the surface of tubing and sucker rods from pollution (oil, paraffins, asphaltenes, mineral deposits, oxides, etc.) is produced by short-term exposure to low-temperature plasma 6000-20000 ° C and an energy density of 10 ¹¹ W / m ² on the surface to be cleaned. The most effective heating method is convective heating of the product in a stream of hot gas (GB Sinyarev, MV Dobrovolsky. "Liquid rocket engines" published by the Defense Industry, Moscow, p. 233, 1955).

The higher the temperature of this gas and its speed, the more heat and with greater speed it is transferred to the heated body, the shorter the time it will be heated to the required temperature. The heating time is determined empirically due to the selection and correlation of the number of plasmatrons, their power and the speed of pulling the tubing.

At this temperature and thermal energy density, all known chemical elements and their compounds instantly evaporate or sublimate from the surface being cleaned, leaving the surface clean.

The cleaning process is carried out with high productivity, does not depend on weather conditions (heat, frost) and is environmentally friendly, since all organic molecules dissociate under the influence of high temperature (6000-20000 ° C), i.e. decompose into their constituent atoms C, O ₂ , H ₂ , which as a result of recombination (subsequent combustion) of complex carcinogenic molecules form the simplest safe products of combustion such as CO ₂ and H ₂ O.

The use of hydrocarbons, air, oxygen, alcohol, acetone, and mixtures thereof as plasma-forming working fluids (PRT) facilitates this transformation of carcinogenic molecules into the simplest safe compounds.

Thermal plants for the utilization of chemical weapons and toxic chemical compounds are currently operating on this principle (MN Bernadiner. A.11. Shurygin, “Fire Processing and Disposal of Industrial Waste.” M .: Chemistry, 1990).

The use of propane or acetylene burners when cleaning tubing does not lead to such an effect due to the low temperature and energy density in the stream of combustion products of these burners. On the contrary, this leads to the gasification of complex organic molecules, which are harmful, for example, at low-temperature (ordinary) burning of garbage, which leads only to pollution of the surrounding space.

Thus, the essence of the proposed cleaning method is that the surface cleaning of metal pipes is not mechanical removal due to the collision of solid particles in a stream of compressed air (sand and shot blasting) on the surface, but in the high-temperature effect of the plasma flow on the dirt particles on the surface with their subsequent blowing off (evaporation or sublimation) from the surface by a plasma jet. The most effective such cleaning is realized if the plasma jet acts on the surface of the tubing at an oblique angle. All dirt on the surface of the tubing is gasified and leaves the surface. Moreover, surface cleaning is carried out almost at the molecular or atomic level. The process proceeds quickly, so the pipe material does not have time to heat up to high temperatures.

Thus, with a short-term exposure of the plasma to the surface being cleaned, hydrocarbons (oil, paraffin, asphaltenes, etc.) melt and gasify instantly. Due to heat stroke, mineral deposits and crusts of oxides crack on the surface, and their adhesive bond with the metal surface of the products is lost. Under the influence of a high-speed plasma stream washing the surface being cleaned, gaseous products, particles of mineral deposits and oxides are removed from the surface being cleaned.

Then, through the gas ducts of the ventilation system, they enter the filters, where the cleaning products are captured and then disposed of together with the filters or separately.

According to the proposed method for cleaning tubing contaminated with asphalt-resin-paraffin deposits (AFS), rust (oxides), mineral deposits and oil tubing enter the through passage box for external pipe cleaning. The passage box has an input and output, the mechanism for moving the tubing through the box is translational, translational-rotational and reverse. The internal cavity of the box is connected to a ventilation system for the removal of gaseous cleaning products and a system for collecting liquid and solid waste. The walls of the box have channels for cooling its body, if it heats up during operation, or for heating the body in order to facilitate the collection of paraffin deposits in a pallet and further into the discharge neck into a container.

In the walls of the through passage box for external cleaning, tubing is placed from one or more jet or flare plasmatrons (RF Patent No. 143764 from 09.082013, Fokin G.A., Sivokon V.N., Ilyin N.E. et al.), Thus that when dirty tubing or sucker rods pass through the box, their surface is cleaned with high-speed plasma plasmatrons. In this case, the tubing itself or the sucker rods are heated. The cleaning of the outer surface is organized so that by its completion the inner wall of the tubing warmed up to the melting point of the paraffin paraffin, after which the paraffin paraffin along the permeated paraffin paraffin paraffin, the liquid boundary layer is easily ejected from the tubing. In experiments, this takes less than a minute, and in some cases, a pillar (core) of paraffin deposits fell out of the tubing under its own weight. This method is especially effective in the winter, when at negative temperatures the ARPD inside the tubing becomes very hard and firmly connected with the inner wall of the tubing, it is even impossible to drill it due to the presence of sand in it.

In practice, tubing is not always contaminated with paraffin deposits inside; often other contaminants accumulate in them (mineral deposits, rust crusts, etc.). To clean the tubing from these contaminants, it is enough to heat the pipe to a high temperature, but not more than 650 ° C, to prevent arbitrary heat treatment, for example, quenching, which becomes possible when heated to a temperature above the temperature of phase and structural changes. Such changes are possible when steel is heated above 700 ° C (Yu.P. Solntsev, E.I. Pryakhin, F. Voitkun. Materials Science, M. MISIS, 1999, p. 217). When the tubing is heated to 650 ° C, all crystalline mineral deposits and rust crusts lose contact with the pipe metal and are easily crushed, so it is not difficult to remove them from the pipe, which is provided for by the method and device of the invention.

After external cleaning of the tubing in the passage box, the tubing is moved to the internal cleaning section, where the paraffin is pushed out of the inner tubing cavity. They are pushed out mechanically with a piston, steam pressure, compressed gas, liquid, or due to the inclination of the tubing under its own weight. The paraffin is pushed into a container for disposal.

Since traces of paraffin deposits, mineral deposits and other contaminants may remain on the inner wall of the tubing, the tubing is moved to the final cleaning site.

The meaning of the final cleaning of the internal cavity of the tubing consists in gasification, thermal dissociation of the ARPD and further high-temperature combustion with the subsequent extraction of gaseous, aerosol and dust-like products of internal cleaning from the tubing cavity into the smoke exhaust system through filters and further into the atmosphere.

To do this, at the site of final cleaning of the internal cavity of the tubing, a jet plasmatron is introduced into the pipe or a tubing is rolled onto a plasmatron mounted on a rod. As the plasmatron moves inside the tubing due to the interaction of the plasma jet with the inner walls, the deposits of paraffin deposits evaporate from them, dissociate and burn in the tubing cavity. For the complete combustion of hydrocarbons, in addition to the plasmatron (parallel to the plasma jet or concentric to it), air, oxygen or other gases enter the pipe, ensuring high-temperature complete combustion of the residues of ARPD. This resembles the process in the combustion chamber of a hybrid rocket engine (Big Soviet Encyclopedia, 3rd ed., M. Soviet Encyclopedia, 1971, p. 1357).

Due to the high-temperature interaction of the plasma jet and combustion products of ARPD with the inner wall of the tubing, as a result of heat stroke, mineral deposits, oxide crusts crack and lag behind the walls. The flow of combustion products they are carried into the gas duct, which is connected to the free end of the tubing in the ventilation system and the collection of treatment waste. To do this, before finishing cleaning, the free end of the tubing is hermetically articulated with a gas outlet unit or this assembly is rolled and articulated with a tubing. Considering that gaseous cleaning products have a high temperature, the gas outlet unit and the gas duct have forced cooling of the walls and the casing or liquid, steam or gases, for example water, water vapor or air, are sprayed into the high-temperature stream to cool it.

If the tubing was stained during transportation between the internal cleaning sections, then at the outlet of the final internal cleaning section of the tubing, a passage box for external cleaning of the tubing is installed, which is a copy of the input box for cleaning the outer surface of the tubing, only of lower power.

The method of cleaning tubing (tubing) includes the action of a jet of low-temperature plasma plasmatrons on the surface to be cleaned, gasification and thermal dissociation of the cleaning products and their subsequent recombination into the simplest molecules of water and carbon dioxide, the relative movement of the pipes and plasmatrons, The outer surface of the pipe is cleaned by jets of low-temperature plasma plasmatrons before the boundary layer is melted between the asphalt-resin-paraffin deposit inside the pipe and the inner wall of the pipe, then deposits they are removed from the inner cavity of the pipe, after which a jet plasmatron is introduced into the tubing, or a tube is rolled onto the jet plasmatron with the possibility of thermodynamic action of the plasma jet on the inner surface of the tubing, and the products of cleaning the inner surface of the pipe are extracted through the free end of the pipe to which the gas duct is connected with the possibility of pumping into liquid and gaseous products of cleaning the internal cavity of the tubing.

As a plasma forming working fluid for a jet plasmatron, hydrocarbons, air, oxygen, alcohol, acetone and mixtures thereof are used.

Gas, water or water vapor is sprayed into the gas duct cavity.

In parallel and / or concentric with the plasma torch stream, air, oxygen, inert gases, nitrogen, hydrocarbon gases, carbon dioxide, hydrogen and mixtures thereof are blown.

In parallel and / or concentrically, a stream of plasmatron is injected with water, alcohol, acetone, hydrocarbon liquids and mixtures thereof.

The tubing is additionally cleaned from the outside at the end of the entire technological process of cleaning in a passage box in jets of plasmatrons.

A device for cleaning tubing (tubing) contains plasmatrons, systems to ensure their operation, mechanisms for moving tubing. At the input, it is equipped with a passage box for external cleaning, in the walls of which there are plasma torches with the possibility of heating the tubing with plasma jets while passing the tubing, and also contains an internal cleaning section containing a device for expelling internal contamination from the tubing, a final cleaning section of the internal tubing cavity containing jet a plasmatron, its associated mechanism with the possibility of reverse movement of the plasmatron in the inner cavity of the tubing along the entire length from the free end of the pipe and a movable gas outlet assembly into exhaust ventilation with the possibility of articulating tubing with it.

The walls of the through passage box for external cleaning have channels with the ability to cool or heat the box.

The device further comprises a collection unit for cleaning waste from the inner cavity of the pipe with the possibility of hermetically articulating the free end of the tubing with it and / or the possibility of rolling this unit and articulating it with the free end of the tubing and the possibility of further moving it along with the tubing.

A device for enabling internal pollution from the tubing to be expelled includes a piston with the possibility of mechanical extrusion of internal pollution from the tubing to the solid and liquid waste collection unit or has a tubing movement mechanism with the possibility of rolling it onto the piston along the entire length and the possibility of pushing the cleaning waste into the waste collection unit.

A device for allowing internal pollution from the tubing to be expelled includes a device with the ability to push internal pollution from the tubing to the waste collector using steam, compressed gases or liquid pressure.

A movable gas outlet assembly in exhaust ventilation is connected to the tubing at one end or with the possibility of rolling and jointing this assembly with the tubing.

The jet plasmatron is placed on a rod fixed along the tubing axis and has a mechanism for rolling the tubing onto the jet plasmatron along the entire length or part of the pipe, while the gas outlet assembly can move together with the tubing without breaking the joint.

The device has a node sealing rod of the jet plasmatron and the input part of the tubing.

The gas and liquid supply lines are connected to the jet plasmatron with the possibility of supplying them in addition to the plasmatron concentrically and / or parallel to the plasma jet.

The device has an output box for external cleaning through passage with plasmatrons with the possibility of external tubing cleaning, coupled with a ventilation system.

Brief Description of the Drawings

On the diagram of a method for cleaning tubing and device for its implementation are presented:

1. Source contaminated tubing.

2. The mechanism for moving tubing through an external cleaning box.

3. Exhaust ventilation system with filters.

4. The system for introducing gas, steam and / or liquid into the internal cavity of the passage of the cleaning box.

5. The cooling system of the passage through the cleaning box.

6. Inkjet plasmatrons for external tubing cleaning.

7. Housing through passage cleaning.

8. Tubing during external cleaning.

9. The mechanism for moving tubing from the external cleaning box to the internal cleaning section.

10. The tubing is cleaned outside.

11. The device for supplying gas, steam or liquid to eject the paraffin from the tubing.

12. A device for moving the piston of the internal tubing cleaning from ASPO.

13. The piston rod.

14. Piston (brush).

15. Tubing in the area of internal cleaning.

16. A mobile unit for collecting solid and liquid wastes from the internal tubing.

17. The mechanism for moving tubing.

18. The mechanism of reverse movement of the plasmatron of the internal final cleaning of the tubing.

19. The gas and liquid supply system concentrically or parallel to the plasma jet.

20. Plasmatron for internal tubing cleaning.

21. The sealing unit at the entry of the plasmatron into the tubing.

22. The mechanism of articulation and movement (rolling) of the collection unit for cleaning waste.

23. Filters for aerosol and gaseous cleaning products in a system for extracting cleaning products from tubing.

24. Gas outlet unit of liquid and gaseous tubing internal cleaning products.

25. The system of input and atomization of gas, water and water vapor in the gas duct.

26. The cooling system of the walls of the gas duct.

27. The mechanism for moving (rolling) the tubing to the plasmatron during the final cleaning of the tubing inside.

28. tubing at the finishing site.

29. Gas and liquid supply lines concentrically or parallel to the plasma jet.

30. Filters.

31. Housing of a through passage external cleaning tubing.

32. The ventilation system.

33. The cooling system through passage box external cleaning.

34. Purified tubing.

35. Inkjet plasmatrons of external final cleaning. A. Plasma jets from plasmatrons.

Photo 1-5 shows examples of tubing cleaning using the proposed method and device.

The implementation of the invention

According to the present invention, dirty outside and inside the tubing 1 using the movement mechanism 2 is fed into the body of the passage of the cleaning box 7, where, using the jets A of the plasmatrons 6, the outer surface of the tubing is cleaned and heated. In the process of external cleaning of tubing in jets A of plasmatrons 6 inside the box, the cleaning products have a high temperature. To reduce the temperature of the cleaning products and to prevent their burning out, an exhaust ventilation system with filters 3 and inside the box 7 is provided with a system 4 for introducing gas, steam and / or liquids (water, steam, CO ₂ , N ₂ , etc.) into the stream of cleaning products. ) The body of the passage through the cleaning box 7 has cooling 5. Next, the heated tubing 10 enters the internal cleaning section, where the ARPD is pushed out of the internal cavity of the tubing 15 using the moving device 12 of the rod 13 and the piston 14 or using the device 11 with compressed gas, steam or liquid. In addition, paraffin is removed even under its own weight due to the inclination of the tubing (the inclination mechanism in the diagram is not shown). When cleaning with a piston 14, it is introduced into the tubing using a device 12 or the tubing 15 is rolled by a mechanism 17 onto the piston 14, and contaminants in solid or liquid form are collected in a liquid and solid waste collection unit 16, which can be moved from the tubing 15 using a mechanism 22 without breaking the joint.

Next, the tubing 10 is moved to the final tubing cleaning section, where the jet plasmatron 20 is introduced into the tubing using the reverse movement mechanism 18 or the tubing 28 is rolled onto the jet plasmatron 20 by the transfer mechanism 27. Under the influence of the plasma jet, the deposits of ARPD with the inner walls of the tubing evaporate and in a gaseous state enter the exhaust ventilation through the gas outlet unit 24 and the filter system 23. The gas outlet unit 24 is hermetically connected to the tubing being cleaned and has the ability, without breaking the airtight coupling, move with it with the moving mechanism 22 when rolling on the jet plasmatron 20. As shown by the experiments of the authors, the supply of air and combustible gases to the plasma jet region of the plasmatron 20 or parallel to it into the tubing cavity excites an intense high-temperature ARPD combustion reaction inside the tube in the same way as in combustion chamber of a hybrid rocket engine. Combustible gases, liquids, and air are supplied from the system 19 via different lines 29 to the region of the plasma jet of the plasmatron 20 or concentrically to the internal cavity of the tubing. This leads to a sharp increase in the intensity and productivity of tubing cleaning inside from paraffin, because Inside the tubing, a high-speed flow of combustion products is realized, which strips any mineral deposits, sand and oxides from the inner walls of the tubing. By analogy with a hybrid rocket engine, the speed of this high-temperature flow can reach hundreds of meters per second. All this flow enters the gas outlet unit 24, which is hermetically connected to the tubing 28. At the entry point of the plasmatron 20 into the tubing, the input rod is sealed by the node 21, which makes the cleaning process environmentally friendly in an enclosed space. The body of the exhaust gas unit 24 has forced cooling 26. In order to reduce the temperature of the combustion products at the outlet, the exhaust system 24 is provided with a system 25 for introducing and spraying liquids, steam and gases (H ₂ O, CO ₂ , N ₂ , etc.) in the products of combustion. )

After cleaning the inner cavity of the tubing with a jet plasmatron 20, it may turn out that the tubing, when moving between the cleaning sites from the outside, is slightly contaminated with waste cleanings. In this case, the tubing is additionally passed through an external cleaning passageway 31, which has the exhaust of the cleaning products into the ventilation system 32 through filters 30, jet plasmatrons 35 and the cooling system of the housing 33. At the outlet, the clean tubing 34 is transported for further repair.

ZAO Petroplazma, the owners and employees of which are the authors, has been conducting research and development work for over ten years in the development of plasma machines for cleaning metal products from scale, rust and any other contaminants (Plasma electric arc cleaning of metal products, E.S. Senokosov, A .E. Senokosov, Metallurgist No. 4, 2005 - p. 44; RF Patent No. 143764 of 08/09/2013, etc.).

Experiments using jet plasmatrons according to the invention have shown that tubing cleaning from paraffin and any other contaminants is 3-5 times more productive, environmentally friendly, the amount of waste has sharply decreased, and the cost of cleaning has decreased by 2-3 times. The proposed method and device has proven its viability and usefulness.

Claims (27)

1. The method of cleaning tubing (tubing), including the action of a jet of low-temperature plasma plasmatrons on the surface to be cleaned, gasification and thermal dissociation of the cleaning products and their subsequent recombination into the simplest molecules of water and carbon dioxide, the relative movement of pipes and plasmatrons, characterized in that the outer surface of the pipe is cleaned with jets of low-temperature plasma plasmatrons until the boundary layer is melted between the asphalt-resin-paraffin deposit inside the pipe and the inner wall of the pipe, then deposits are removed from the internal cavity of the pipe, after which a jet plasmatron is introduced into the tubing or the pipe is rolled onto the jet plasmatron with the possibility of thermodynamic action of the plasma jet on the inner surface of the tubing, and the cleaning products of the inner surface of the pipe are removed through the free end of the pipe to which gas duct with the possibility of pumping into it liquid and gaseous products of cleaning the inner cavity of the tubing. 2. The method according to p. 1, characterized in that the tubing during the cleaning process is heated no higher than 650 ° C. 3. The method according to p. 1, characterized in that the tubing is tipped at one end into a waste collection container and asphalt-resin-paraffin deposits are removed under their own weight. 4. The method according to p. 1, characterized in that the deposits from the inner cavity of the pipe are removed with compressed gas, steam or liquid. 5. The method according to p. 1, characterized in that the deposits from the inner cavity of the pipe are removed by a piston. 6. The method according to p. 1, characterized in that the plasmatron jets are directed at an oblique angle to the cleaned outer surface of the tubing. 7. The method according to p. 1, characterized in that the cavity of the tubing is sealed along the rod at the entry of the plasmatron into the pipe. 8. The method according to p. 3, characterized in that as the plasma forming working fluid for the jet plasmatron, hydrocarbons, air, oxygen, alcohol, acetone and mixtures thereof are used. 9. The method according to p. 3, characterized in that the walls of the gas duct are cooled by force. 10. The method according to p. 3, characterized in that gas, water or water vapor is sprayed into the gas duct cavity. 11. The method according to p. 10, characterized in that in parallel and / or concentric stream of the plasmatron blow air, oxygen, inert gases, nitrogen, hydrocarbon gases, carbon dioxide, hydrogen and mixtures thereof. 12. The method according to claim 10, characterized in that water, alcohol, acetone, hydrocarbon liquids and mixtures thereof are introduced in parallel and / or concentrically to the plasmatron stream. 13. The method according to p. 1, characterized in that the tubing is additionally cleaned externally at the end of the entire technological process of cleaning in a passage box in jets of plasmatrons. 14. A device for cleaning tubing (tubing), containing plasmatrons, systems that ensure their operation, mechanisms for moving tubing, characterized in that at the entrance it is equipped with a passage box for external cleaning, in the walls of which are located around the perimeter plasmatrons with the possibility of heating tubing plasma jets during the passage of the tubing, and also contains an internal cleaning section containing a device for ejecting internal contamination from the tubing, a final cleaning section of the internal cavity of the tubing containing a jet plasmatron enny him mechanism reversibly moving the plasmatron in the internal cavity along the entire length of tubing with the free end of the movable gas exhaust pipe and exhaust ventilation node with the possibility of articulation with them tubing. 15. The device according to p. 14, characterized in that the walls of the passage box of the external cleaning have channels with the ability to cool or heat the box. 16. The device according to p. 14, characterized in that the passage box of the external cleaning has gas or liquid inlets in the gap between the tubing and the inner wall of the box. 17. The device according to p. 14, characterized in that it further comprises a collection unit for cleaning waste from the inner cavity of the pipe with the possibility of hermetically articulating the free end of the tubing with it and / or the possibility of rolling this assembly and articulating it with the free end of the tubing and the possibility of its further movement along with tubing. 18. The device according to p. 14, characterized in that the device for ejecting internal contamination from the tubing contains a piston with the ability to mechanically push internal contamination from the tubing to a solid and liquid waste collection unit or has a mechanism for moving the tubing with the possibility of rolling it over the piston along the entire length and the ability to push cleaning waste into a waste collection unit. 19. The device according to p. 14, characterized in that it contains a device for ejecting internal contamination from the tubing into the waste collector using steam, compressed gases or liquid pressure. 20. The device according to p. 14, characterized in that the device for ejecting internal contamination from the tubing contains a mechanism for tilting the tubing at one end into a waste collection container. 21. The device according to p. 14, characterized in that the movable gas outlet unit in the exhaust ventilation is connected to the tubing at one end or with the possibility of rolling and jointing this node with the tubing. 22. The device according to p. 14, characterized in that the jet plasmatron is placed on a rod fixed along the tubing axis, and has a mechanism for rolling the tubing to the jet plasmatron along the entire length or part of the pipe, while the gas outlet assembly can move together with the tubing pipe without breaking the joint. 23. The device according to p. 14, characterized in that the gas outlet device from the inner cavity of the pipe and the gas duct have forced cooling and / or a system for injecting liquid, steam or gas into the stream of aerosol and gaseous cleaning products. 24. The device according to p. 22, characterized in that it has a node for sealing the rod of the jet plasmatron and the input part of the tubing. 25. The device according to p. 14, characterized in that the gas and liquid supply lines are connected to the jet plasmatron with the possibility of supplying them in addition to the plasmatron concentrically and / or parallel to the plasma jet. 26. The device according to p. 14, characterized in that it has an output box for external cleaning with plasmatrons with the possibility of external cleaning of the tubing, coupled with a ventilation system. 27. The device according to p. 14, characterized in that as the plasma-forming working fluid use hydrocarbons, air, oxygen, alcohol, acetone and mixtures thereof.

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