CN216131507U - Seabed anticorrosion wear-resisting resistance-reducing pipeline - Google Patents

Abstract

The utility model discloses a submarine anticorrosion wear-resistant resistance-reducing pipeline, which is used for meeting the requirements of anticorrosion wear-resistant resistance reduction of an inner hole of a submarine oil and gas transmission pipeline. The technical scheme is as follows: firstly, expanding a pipe orifice by adopting a cold expansion pipe technology, then processing a groove, and overlaying an anti-corrosion wear-resistant alloy on the bottom surface of the groove and the inner hole surface of a pipe expansion part; grinding and polishing the inner hole surface of the sea pipe, selectively co-infiltrating deposited ions on the inner hole surface to form an anticorrosion wear-resistant antifriction alloy deposition layer, polishing, sealing and passivating the alloy deposition layer, and then adopting the existing sea pipe external anticorrosion protection technology. Although the alloy deposition layer is very thin, the flow resistance of oil gas can be reduced, the transportation capacity of the marine pipe is improved, the corrosion resistance and the wear resistance of the inner hole of the marine pipe are enhanced, and the service life of the marine pipe is prolonged. The corrosion-resistant wear-resistant drag reduction sea pipe has low processing difficulty and wide application range, and fills the blank that the inner diameter of the existing sea pipe is not consistent and the corrosion-resistant wear-resistant drag reduction technology in the sea pipe does not exist.

Description

Seabed anticorrosion wear-resisting resistance-reducing pipeline

Technical Field

The utility model relates to a submarine petroleum and natural gas conveying pipeline, which increases the corrosion resistance, wear resistance and drag reduction performance of the inner surface of a pipeline on the basis of the existing external corrosion protection technology and belongs to the field of machining.

Background

The ocean occupies about 71 percent of the earth area, and the ocean contains and enriches seabed resources, including various mineral substances such as petroleum, natural gas and the like, and along with the rapid development of the offshore oil and gas field, the importance liquid of the seabed oil and gas transmission pipeline is remarkable day by day. Just with the submarine pipelines, the whole oil and gas gathering, transporting, storing and transporting system of the ocean oil and gas field is organically connected. However, the marine environment is an extremely harsh corrosive environment, and the submarine pipeline is exposed to corrosion and abrasion at any time, which directly affects the service life and safety of the submarine pipeline. The failure types of the submarine pipelines are more, and the failure proportion caused by different reasons is as follows: 35% of corrosion, 30% of external force damage, 15% of pipeline design, 12% of operation errors and 8% of others. Therefore, the method is particularly important for the corrosion prevention and wear resistance protection of the submarine pipeline. The medium transported by the submarine pipeline mainly comprises natural gas, crude oil, formation water, a mixture of the natural gas and the crude oil, and the like. The corrosion in the submarine pipeline mainly comprises carbon dioxide, hydrogen sulfide and other acidic corrosion; the main wear in the submarine pipeline is erosion of flowing oil, gas, water and formation sand. At present, the corrosion prevention of submarine pipelines in ocean engineering mainly refers to internal corrosion prevention and external corrosion prevention. The corrosion prevention in the sea pipe is mainly realized by adding a corrosion inhibitor into a conveying medium and increasing the corrosion allowance of the pipeline, and no effective corrosion prevention, wear resistance and resistance reduction technical measures in the sea pipe exist, mainly because the pipe diameter of the sea pipe applied to the marine engineering in China at the present stage is usually small, and the corrosion prevention, wear resistance and resistance reduction treatment are difficult to be carried out on the inner wall of the sea pipe by other methods; the external corrosion prevention of the submarine pipeline is mainly realized by a method of combining sacrificial anode cathodic protection and external coating protection. Although the existing lining stainless steel tube technology, non-metal inner coating technology and inner surfacing stainless steel technology can improve the corrosion resistance and wear resistance of the inner hole of the sea pipe in a period of time, the existing lining stainless steel tube technology, non-metal inner coating technology and inner surfacing stainless steel technology cannot provide the resistance reduction performance, and simultaneously face the following problems: 1. the inner diameter of the sea pipe is reduced, and the conveying capacity of the sea pipe is reduced; 2. the pipe orifice welding part has a thin neck, or galvanic corrosion among different metals, or welding strength is reduced, and the failure risk of the pipe orifice connecting part is increased; 3. the corrosion and wear resistance of the nonmetal inner coating is short in service life, and the requirement of long-term service of the marine pipe cannot be met; 4. The lining pipe technology and the inner surfacing technology have high cost and poor economic benefit; 5. the laying time and the operation cost of the sea pipe site construction are increased; 6. the phenomena of 'thin neck' and 'neck clamping' appear in pipe orifice welding, which not only hinders the desilting and blockage removing operation of the oil and gas transmission pipeline, but also is the most serious place of flowing corrosion and the frequent place of corrosion resistance failure. Along with the exploration and development of domestic seabed high-sulfur-content oil and gas reservoirs and other oil and gas reservoirs containing acidic corrosive media, corrosion and abrasion bring increasingly prominent adverse effects to the safe and stable operation of seabed oil and gas transmission pipelines, and the seabed oil and gas transmission pipelines which are long-term corrosion-resistant, wear-resistant and drag-reducing are indispensable strategic assets. The utility model provides an in-pipe corrosion-resistant wear-resistant drag-reduction sea pipe on the basis of an out-sea-pipe corrosion-resistant technology.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the lining stainless steel pipe technology, the non-metal inner coating technology and the inner build-up welding stainless steel technology, the utility model provides an inner-pipe corrosion-resistant wear-resistant drag-reduction submarine pipe, namely a submarine corrosion-resistant wear-resistant drag-reduction pipeline, on the basis of the existing outer-pipe corrosion-resistant technology.

The specific technical scheme is as follows:

according to the submarine environment and the properties of oil-gas fluid delivery of the service of the marine pipe, referring to the mechanism, position, law and characteristics of failure of the marine pipe, particularly the diameter, wall thickness, finish degree of an inner hole surface, material and other data of the marine pipe, in order to enhance the corrosion-resistant, wear-resistant and resistance-reducing performance of the inner hole of the marine pipe and the welding strength of a pipe orifice, the cold expansion of the marine pipe 20-5000mm away from the pipe orifice is expanded by 2-8mm by adopting a pipe expansion technology (comprising a cold expansion pipe technology and a hot expansion pipe technology), a chamfer angle of 30-60 degrees is processed on the pipe orifice, and corrosion-resistant and wear-resistant alloy is surfacing-welded on the inner hole surface of the expansion pipe and one tenth of the groove bottom surface of the pipe orifice, so that the wall thickness and the strength of the pipe orifice are increased; the method is characterized in that a slope surface of a pipe opening is not welded, and a carbon steel substrate surface of the marine pipe is still reserved (the method has the advantages that in the subsequent marine pipe welding construction, when the marine pipe groove is in butt joint welding, the same type of anti-corrosion wear-resistant welding wire is used for welding a welded alloy layer, and a carbon steel welding rod is used for welding the carbon steel substrate surface of the marine pipe, so that the marine pipe substrate can be protected from corrosion and abrasion, the welding strength of the marine pipe can be improved, particularly the integral connection strength of the marine pipe is improved, and the method is the original point of the utility model). Then, sand blasting is carried out to polish the inner hole surface of the sea pipe, different deposition equipment and different composite ion deposition modes and process parameters are selected aiming at different requirements of corrosion prevention, wear resistance and drag reduction of the inner hole of the sea pipe, and different corrosion prevention, wear resistance and friction reduction ions are selectively and co-infiltrated and deposited on the inner hole surface of the sea pipe to form an alloy layer; if a horizontal flowing solution rotating electrodeposition mode is selected, corrosion-resistant, wear-resistant and friction-reducing ions are selectively co-infiltrated and deposited on the inner circular surface of the sea pipe to form an alloy layer. Although the deposited anticorrosive wear-resistant antifriction alloy layer in the marine pipe is very thin and only about 0.03-0.09 mm, the flow resistance of oil gas in the marine pipe can be greatly reduced, the transportation capacity of the marine pipe is improved, the anticorrosive wear-resistant performance of the marine pipe is greatly enhanced, and the service life of the marine pipe is prolonged by times. After the anti-corrosion, wear-resistant and antifriction alloy layer is deposited on the inner hole surface of the sea pipe, whether the alloy deposition layer on the inner hole surface of the sea pipe is subjected to dehydrogenation treatment can be selected according to the requirements of the anti-corrosion, wear-resistant and antifriction ion electrodeposition process. No matter the sea pipe is dehydrogenated or not, the alloy deposition layer on the inner hole surface of the sea pipe needs to be polished, sealed, passivated and externally anti-corrosion protected, so that hydrogen damage hidden dangers such as hydrogen brittleness and hydrogen corrosion are eliminated, pitting corrosion is eliminated, and the functions of friction reduction and passivation self-healing are enhanced.

The specific technical method comprises the following steps:

1. sand blasting, rust removing, scale removing and grinding treatment are carried out on the inner hole surface of the sea pipe;

2. expanding the inner diameter of each sea pipe with the distance of about 20-5000mm from the pipe orifice by 2-8mm by adopting a pipe expanding method at two ends of each sea pipe;

3. processing a 30-60-degree groove on the pipe orifice;

4. overlaying an anticorrosive wear-resistant material with the thickness of about 1-4mm, such as 625, 825, 316L, Allay20, nickel-copper alloy, nickel-tungsten-copper alloy, nickel-cobalt-zirconium alloy and the like, on the inner hole surface of the expanded sea pipe;

5. surfacing anti-corrosion wear-resistant material end surfaces on one tenth of the bottom surface of the groove of the sea pipe opening and the inner hole surface of the expansion pipe section, surfacing anti-corrosion wear-resistant material for 1-2mm on the parallel groove opening surface, and then processing the parallel groove opening surface into a chamfer surface not smaller than the groove;

6. the bevel face with nine tenth of the pipe opening is still the surface of the carbon steel alloy material of the pipeline;

7. putting the sea pipe into a horizontal flowing solution rotating co-permeation electro-deposition device;

8. the anode is inserted into the inner hole of the sea pipe, and the cathode and the anode of the power supply are respectively connected to the sea pipe and the anode;

9. pumping solution containing different corrosion-resistant, wear-resistant and friction-reducing ions into the flowing solution rotary co-permeation electrodeposition device, preparing and controlling the proportion, density, concentration, purity, fluidity and PH value of the different corrosion-resistant, wear-resistant and friction-reducing ions, auxiliary nanoscale functional additive components and the like, and keeping the corrosion-resistant, wear-resistant and friction-reducing ion solution alkaline all the time;

10. according to different corrosion-resistant, wear-resistant and friction-reducing ion deposition mechanisms and deposition paths, selecting a frequency modulation power supply pulse mode (complex phase pulse, positive and negative pulses and unidirectional pulse), and setting and adjusting the current pulse frequency and intensity;

11. arranging an ultrasonic device according to different corrosion-resistant, wear-resistant and friction-reducing ion deposition mechanisms and deposition paths, arranging ultrasonic frequency, range, form and strength on a corrosion-resistant, wear-resistant and friction-reducing ion solution and a marine pipe, and matching with a stirrer in the solution to uniformly and finely divide each ion component in the solution;

12. according to the pulse current intensity and the pulse frequency and the requirement of inhibiting hydrogen evolution and hydrogen permeation, the concentration of conductive ions in the solution, the circulating flow speed and the circulating flow temperature of the solution are adjusted, and the current efficiency is improved;

13. detecting the concentration change and the pulse current density change of each ion in the solution and the wave field change of each point in the ultrasonic solution in real time, analyzing the performance index of the deposition layer, and continuously optimizing the ion deposition process parameters;

14. the proportion, density and concentration of different anticorrosion, wear-resistant and antifriction ions, the power supply pulse frequency and the current intensity are adjusted in time, and the selective co-permeation deposition time of the anticorrosion, wear-resistant and antifriction ions is accurately controlled;

15. replenishing different anticorrosive wear-resistant antifriction ion solutions at any time, adjusting the proportion of each component in the solution in time, continuously and circularly and mechanically stirring the solution, matching ultrasonic stirring and shaking, splitting ion clusters, refining and homogenizing ion distribution in the solution, and improving the dispersion ratio of each component in the solution in a single ion state;

16. and when the metal ion deposition reaches a design value, immediately taking out the sea pipe, and selecting whether to perform dehydrogenation treatment on the alloy deposition layer on the inner hole surface of the sea pipe according to the requirements of the anticorrosion wear-resistant antifriction ion electrodeposition process. If dehydrogenation is needed, the hydrogen is sent into a dehydrogenation device and is respectively subjected to the procedures of washing, adsorption, high-temperature baking dehydrogenation and the like, and the hidden danger of hydrogen damage such as crispness, hydrogen corrosion and the like is eliminated;

17. carrying out leak source detection on the anti-corrosion wear-resistant antifriction alloy deposition layer on the hole surface in the sea pipe, and mastering the leak source distribution condition on the surface of the alloy deposition layer;

18. polishing the anticorrosion wear-resistant antifriction alloy deposition layer on the hole surface in the sea pipe;

19. and (3) the polished marine pipe enters a surface plugging device, a hole sealing agent is sprayed in an inner hole of the marine pipe, and the hole is sealed in a key way according to the leakage point distribution on the surface of the alloy deposition layer.

20. Wrapping the outer surface of the sea pipe, conveying the sea pipe into passivation equipment, and passivating the inner hole surface of the sea pipe.

21. Fusing epoxy powder on the outer circle surface of the sea pipe, bonding layer and polyethylene (or polypropylene) coating for protection, inspecting, packaging and warehousing.

Anticorrosive wear-resisting drag reduction sea pipe includes: (1) the pipe joint comprises a sea pipe base body, (2) a pipe expansion section, (3) a pipe orifice slope surface, (4) an anticorrosion wear-resistant alloy layer on an inner hole surface of the pipe expansion section, (5) an anticorrosion wear-resistant alloy layer on the pipe orifice slope surface, (6) an anticorrosion wear-resistant antifriction alloy deposition layer on an inner hole surface of the sea pipe, (7) an anticorrosion wear-resistant antifriction alloy hole sealing layer on the inner hole surface of the sea pipe, (8) an anticorrosion wear-resistant antifriction alloy passivation layer on the inner hole surface of the sea pipe, and (9) an anticorrosion protection layer on an excircle surface of the sea pipe; the method is characterized in that: the sea pipe matrix (1) forms a pipe expanding section (2) through a pipe expanding process; forming a pipe orifice bevel face (3) through pipe orifice groove processing; forming an anticorrosive wear-resistant alloy (4) on the inner hole surface of the expanded pipe section and an anticorrosive wear-resistant alloy (5) on the pipe orifice bevel surface by overlaying an anticorrosive wear-resistant alloy; the corrosion-resistant and wear-resistant alloys (4) and (5) are metallurgically bonded with the pipeline substrate (1); forming an anticorrosion wear-resistant antifriction alloy deposition layer (6) on the inner hole surface of the pipeline through anticorrosion wear-resistant antifriction ion co-permeation deposition; the anti-corrosion wear-resistant antifriction alloy deposition layer (6) is combined with the sea pipe base body (1) and the anti-corrosion wear-resistant alloy layer (4) through metal bonds; the anticorrosion wear-resistant antifriction alloy deposition layer (6) on the inner hole surface of the sea pipe is sealed by a plugging agent to form an anticorrosion wear-resistant antifriction alloy hole sealing layer (7) on the inner hole surface of the sea pipe; the anticorrosion wear-resistant antifriction alloy hole sealing layer (7) is physically and chemically combined with the anticorrosion wear-resistant antifriction alloy deposition layer (6); the anticorrosion wear-resistant antifriction alloy hole sealing layer (7) is passivated to form an anticorrosion wear-resistant antifriction alloy passivation layer (8); the anticorrosion wear-resistant antifriction alloy passivation layer (8) is chemically bonded with the anticorrosion wear-resistant antifriction alloy deposition layer (6); the anticorrosion protective layer (9) on the excircle surface of the submarine pipe is in molecular bonding combination with the submarine pipe base pipe (1).

Drawings

FIG. 1 is a cross-sectional view of the submarine anticorrosion wear-resistant drag reduction pipeline of the utility model.

Detailed Description

The utility model will be further described with reference to fig. 1 and the following examples.

FIG. 1: a cross section of the submarine anticorrosion wear-resistant drag reduction pipeline.

As can be seen from fig. 1, the corrosion-resistant, wear-resistant and friction-reducing pipeline comprises: (1) the pipe joint comprises a sea pipe base body, (2) a pipe expansion section, (3) a pipe orifice slope surface, (4) an anticorrosion wear-resistant alloy layer on an inner hole surface of the pipe expansion section, (5) an anticorrosion wear-resistant alloy layer on the pipe orifice slope surface, (6) an anticorrosion wear-resistant antifriction alloy deposition layer on an inner hole surface of the sea pipe, (7) an anticorrosion wear-resistant antifriction alloy hole sealing layer on the inner hole surface of the sea pipe, (8) an anticorrosion wear-resistant antifriction alloy passivation layer on the inner hole surface of the sea pipe, and (9) an anticorrosion protection layer on an excircle surface of the sea pipe; the method is characterized in that: the sea pipe matrix (1) forms a pipe expanding section (2) through a pipe expanding process; forming a pipe orifice bevel face (3) through pipe orifice groove processing; forming an anticorrosive wear-resistant alloy (4) on the inner hole surface of the expanded pipe section and an anticorrosive wear-resistant alloy (5) on the pipe orifice bevel surface by overlaying an anticorrosive wear-resistant alloy; the corrosion-resistant and wear-resistant alloys (4) and (5) are metallurgically bonded with the pipeline substrate (1); forming an anticorrosion wear-resistant antifriction alloy deposition layer (6) on the inner hole surface of the sea pipe through the co-permeation deposition of anticorrosion wear-resistant antifriction metal ions and non-metal ions; the anti-corrosion wear-resistant antifriction alloy deposition layer (6) is combined with the sea pipe base body (1) and the anti-corrosion wear-resistant alloy layer (4) through metal bonds; the anticorrosion wear-resistant antifriction alloy deposition layer (6) on the inner hole surface of the sea pipe is sealed by a plugging agent to form an anticorrosion wear-resistant antifriction alloy hole sealing layer (7) on the inner hole surface of the sea pipe; the anticorrosion wear-resistant antifriction alloy hole sealing layer (7) is physically and chemically combined with the anticorrosion wear-resistant antifriction alloy deposition layer (6); the anticorrosion wear-resistant antifriction alloy hole sealing layer (7) is passivated to form an anticorrosion wear-resistant antifriction alloy passivation layer (8); the anticorrosion wear-resistant antifriction alloy passivation layer (8) is chemically bonded with the anticorrosion wear-resistant antifriction alloy deposition layer (6); the anticorrosion protective layer (9) on the excircle surface of the submarine pipe is in molecular bonding combination with the submarine pipe base pipe (1).

The pipe expanding section (2) is formed by a sea pipe base body (1) through a pipe expanding process (including a cold pipe expanding process and a hot pipe expanding process).

The pipe orifice bevel face (3) is formed by processing a groove on the expansion pipe section (2).

The anti-corrosion wear-resistant alloy (4) is formed by overlaying the anti-corrosion wear-resistant alloy on the pipe expanding section (2).

The anti-corrosion wear-resistant alloy (5) is formed by overlaying parallel bevel surfaces on the bottom surface of one tenth of the bevel surface (3) of the pipe orifice.

The anti-corrosion wear-resistant alloys (4) and (5) are metallurgically bonded with the pipeline substrate (1).

The anticorrosion wear-resistant antifriction alloy deposition layer (6) is formed by anticorrosion wear-resistant antifriction ion selective co-permeation electrodeposition on the inner hole surface of the sea pipe base body (1) and the surface of the anticorrosion wear-resistant alloy layer (4). The anti-corrosion wear-resistant antifriction alloy deposition layer (6) is combined with the inner hole surface of the sea pipe base body (1) and the surface of the anti-corrosion wear-resistant alloy layer (4) through metal bonds.

The anti-corrosion wear-resistant antifriction alloy hole sealing layer (7) is formed by soaking a plugging agent on the surface of the alloy deposition layer (6).

The anticorrosion wear-resistant antifriction alloy hole sealing passivation layer (8) is formed by carrying out chemical reaction with a compound in a certain mode on the surface of the anticorrosion wear-resistant antifriction alloy hole sealing layer (7).

The anticorrosion protective layer (9) on the outer circular surface of the pipe is formed by fusing epoxy powder, an adhesive layer and polyethylene (or polypropylene) on the outer circular surface of the submarine parent pipe (1).

The utility model has the beneficial effects that:

1. the corrosion-resistant wear-resistant antifriction alloy layer is thin but hard, so that the drift diameter between the pipe and a welded junction is maintained, the corrosion-resistant wear-resistant antifriction performance of the inner hole surface of the sea pipe is improved, the flow resistance of oil, gas and water is reduced, and the conveying capacity of the sea pipe is improved;

2. the corrosion-resistant, wear-resistant and antifriction alloy deposition layer has large bonding force with the sea pipe substrate;

3. in the actual application process of the corrosion-resistant, wear-resistant and drag-reducing sea pipe, the corrosion-resistant, wear-resistant and friction-reducing alloy deposition layer has a natural passivation function in a corrosive medium environment, namely, when the passivation layer is worn, the alloy layer quickly reacts with a corrosive medium to generate a new passivation substance, so that the corrosion resistance and the wear resistance are continued, and the sea pipe is protected;

4. the chamfer angle of the anti-corrosion wear-resistant alloy surface of the opening of the sea pipe is not less than the chamfer angle of the groove of the opening of the sea pipe, when the openings of the sea pipes are in butt joint welding, the anti-corrosion wear-resistant alloy of the opening of one sea pipe is in butt joint with the anti-corrosion wear-resistant alloy of the opening of the other sea pipe, the same anti-corrosion wear-resistant alloy welding wire is used for overlaying a triangular annular area formed by the grooves of the anti-corrosion wear-resistant alloy surfaces of the two openings of the sea pipe to form the anti-corrosion wear-resistant alloy pipe with the thickness of 1-4mm, then the welding wire with the same material as the sea pipe is used for overlaying the trapezoidal annular area formed by the groove surfaces of the two openings of the sea pipe and the anti-corrosion wear-resistant alloy pipe to form the bimetal sea pipe with the thickness larger than the wall thickness of the sea pipe, the anti-corrosion wear-corrosion performance of the sea pipe is enhanced, the connection strength of the openings is improved, and the weak point of the connection of the openings is eliminated.

Practice proves that the anti-corrosion wear-resistant resistance-reducing pipeline not only has all the advantages of a submarine pipeline, but also enhances the anti-corrosion wear-resistant friction-reducing performance of the inner hole of the submarine pipeline, and simultaneously eliminates the weak point of pipe orifice connection. Compared with the existing submarine pipeline, although the cost of the anti-corrosion wear-resistant anti-drag submarine pipeline is increased, the anti-corrosion wear-resistant anti-drag submarine pipeline not only prolongs the service life of the submarine pipeline by times, but also reduces the flow friction of oil gas in the submarine pipeline, improves the conveying capacity of the submarine pipeline, saves resources, reduces the incidence rate of failure accidents of the submarine pipeline, reduces the use risk of the submarine pipeline, has huge economic and social benefits and high cost performance, and is worthy of popularization and use.

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present invention can be modified or replaced equally without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications and equivalents are to be covered by the protection scope of the present invention.

Claims (7)

1. A seabed anticorrosion wear-resisting drag reduction pipeline, seabed anticorrosion wear-resisting drag reduction pipeline include: the device comprises a sea pipe base body, an expansion pipe section, a pipe orifice slope surface, anticorrosion wear-resistant alloy on an inner hole surface of the expansion pipe section, anticorrosion wear-resistant alloy on the pipe orifice slope surface, an anticorrosion wear-resistant antifriction alloy deposition layer on an inner hole surface of the sea pipe, an anticorrosion wear-resistant antifriction alloy hole sealing layer on the inner hole surface of the sea pipe, an anticorrosion wear-resistant antifriction alloy passivation layer on the inner hole surface of the sea pipe and an anticorrosion protection layer on an outer circle surface of the sea pipe; the method is characterized in that: forming an expansion pipe section on the sea pipe matrix through a pipe expansion process; the mouth of the sea pipe is processed to form a mouth slope surface; overlaying an anticorrosive wear-resistant alloy on the inner hole surface and the pipe orifice slope surface of the expansion pipe section, wherein the anticorrosive wear-resistant alloy is metallurgically bonded with the sea pipe matrix; selectively co-permeating and electrodepositing the anticorrosion wear-resistant antifriction ions on the inner hole surface of the sea pipe to form an anticorrosion wear-resistant antifriction alloy deposition layer, wherein the anticorrosion wear-resistant antifriction alloy deposition layer is in metal bond combination with the sea pipe matrix and the anticorrosion wear-resistant alloy of the pipe expansion section; the anticorrosion wear-resistant antifriction alloy deposition layer on the inner hole surface of the sea pipe is subjected to hole sealing by a plugging agent to form an anticorrosion wear-resistant antifriction alloy hole sealing layer on the inner hole surface of the sea pipe, and the anticorrosion wear-resistant antifriction alloy hole sealing layer and the anticorrosion wear-resistant antifriction alloy deposition layer are physically and chemically combined; the anticorrosion wear-resistant antifriction alloy hole sealing layer is subjected to passivation treatment to form an anticorrosion wear-resistant antifriction alloy passivation layer, the anticorrosion wear-resistant antifriction alloy passivation layer is chemically bonded with the anticorrosion wear-resistant antifriction alloy deposition layer, and the anticorrosion protection layer on the outer circular surface of the submarine pipe is molecularly bonded with the submarine pipe base pipe.

2. The subsea corrosion-resistant, wear-resistant and drag-reducing pipeline according to claim 1, characterized in that: the pipe expanding section is formed by expanding the inner diameter of a pipe within 20-5000mm from a pipe orifice by 2-8mm through a pipe expanding process.

3. The subsea corrosion-resistant, wear-resistant and drag-reducing pipeline according to claim 1, characterized in that: the anti-corrosion wear-resistant alloy on the inner hole surface of the tube expansion section is formed by overlaying 1-4mm thick anti-corrosion wear-resistant alloy on the inner hole surface of the tube expansion section within 20-5000mm of the tube orifice through an in-tube overlaying process.

4. The subsea corrosion-resistant, wear-resistant and drag-reducing pipeline according to claim 1, characterized in that: the anti-corrosion wear-resistant alloy on the pipe orifice bevel face is the anti-corrosion wear-resistant alloy with the thickness of 1-2mm which is formed by parallel bevel face surfacing on the bottom face of the bevel of one tenth of the pipe orifice of the expansion pipe section and the end face of the anti-corrosion wear-resistant material which is already surfaced on the inner hole face of the expansion pipe section.

5. The subsea corrosion-resistant, wear-resistant and drag-reducing pipeline according to claim 1, characterized in that: according to different corrosion media, different fluid properties and different fluid erosion environments, different metal ions are selectively subjected to electro-cementation on the inner hole surface of the sea pipe in a co-permeation mode to form a targeted anti-corrosion, erosion-resistant and friction-reducing alloy layer.

6. The subsea corrosion-resistant, wear-resistant and drag-reducing pipeline according to claim 1, characterized in that: the anticorrosion wear-resistant antifriction alloy hole sealing layer on the inner hole surface of the sea pipe is an anticorrosion wear-resistant antifriction alloy hole sealing layer formed on the anticorrosion wear-resistant antifriction alloy deposition layer through polishing and hole sealing agent spraying treatment.

7. The subsea corrosion-resistant, wear-resistant and drag-reducing pipeline according to claim 1, characterized in that: the anticorrosion wear-resistant antifriction alloy passivation layer on the inner hole surface of the sea pipe is formed on the inner hole surface of the sea pipe by passivating the anticorrosion wear-resistant antifriction alloy hole sealing layer.

Images