CN203114187U

CN203114187U - Abrasion-resistant and corrosion-resistant dual-metal composite oil pipe fully covered with coatings

Info

Publication number: CN203114187U
Application number: CN 201320045940
Authority: CN
Inventors: 王家瓚
Original assignee: Yangzhou Safe And Sound Prestige Alloy Stiff Dough Science And Technology Ltd
Current assignee: Yangzhou Safe And Sound Prestige Alloy Stiff Dough Science And Technology Ltd
Priority date: 2013-01-28
Filing date: 2013-01-28
Publication date: 2013-08-07
Anticipated expiration: 2023-01-28

Abstract

The utility model discloses an abrasion-resistant and corrosion-resistant dual-metal composite oil pipe fully covered with coatings. Self-fluxing alloy coatings are sprayed on the inner surface and the outer surface of the oil pipe in a fusing mode, self-fluxing alloy coatings are sprayed on two end faces of the oil pipe in a fusing mode, or nickel base alloy is arranged on the two end faces of the oil pipe in an overlaying mode. The dual-metal composite oil pipe has strong abrasion-resistant and corrosion-resistant performance, and the capacity of resisting corrosion of sulfuretted hydrogen, carbon dioxide and chloridion of the dual-metal composite oil pipe is more than 27-30 times of that of a common carbon steel pipe; the hardness of the coatings is high, an abrasion-resistant effect can be achieved, at a normal temperature, the abrasion-resistant performance of abrasion of common sand grains is 11-13 times of that of the common carbon steel pipe and 8-10 times of that of a stainless steel pipe. The dual-metal composite oil pipe can be used in the environment which contains various corrosion media such as the sulfuretted hydrogen, the carbon dioxide and the chloridion, has high temperatures and high abrasion of a high pressure machine for long time.

Description

The wear resistant corrosion resistant bimetallic composite oil pipe that a kind of full coat layer covers

Technical field

The utility model belongs to oil-gas field drill and transportation equipment field, relates in particular to the compound oil field of the bimetallic thick stick pipe that pipe internal surface evenly applies wear-resistant corrosion-resistant self-melting alloy topping.

Background technology

Much measures of anti-eccentric wear corrosion of each Oilfield using at present, as adopt coupling centralizer, circulator, throw in corrosion inhibiter etc., there is its advantage in these venue eccentric wear-proof process measures, but also exist complexity is installed, expend man-hour, increase the energy consumption that promotes sucker rod, also increased shortcomings such as holddown probability.Along with the underground mining operating mode is abominable gradually, its weak point is more and more obvious, the effect of anti-eccentric wear corrosion also more and more a little less than, fundamentally do not solve wear problem.Adopt the design concept of bimetal tube, become the middle electricity of domestic and international research and development, but also do not have the implementation method of mature and feasible at present.

Summary of the invention

Goal of the invention: in order to overcome the deficiencies in the prior art, the utility model provides a kind of wear resistant corrosion resistant bimetallic composite oil pipe, has better anti-wear performance and decay resistance.

Technical scheme: for achieving the above object, the utility model is achieved through the following technical solutions: the wear resistant corrosion resistant bimetallic composite oil pipe that a kind of full coat layer covers, and the inner surface of described oil pipe and external surface spray fusing have the self-melting alloy coating; And the both ends of the surface spray fusing of described oil pipe has self-melting alloy coating or built-up welding that nickel-base alloy is arranged.

As preferably, described self-melting alloy coating is Ni-based, iron-based or the cobalt-based self-melting alloy that contains B, Si element.

As preferably, the thickness of described self-melting alloy layer is 0.05～2mm.

Beneficial effect: compared with prior art, the utlity model has following advantage: the bimetallic composite oil pipe for preparing by this method comes anticorrosion with inner liner, come guaranteed strength with parent tube, the good mechanical performance of the corrosion resistance that corrosion resistant alloy is good and carbon steel organically combines, reach the corrosion resisting property suitable with inner liner corrosion resistant alloy tubing, improve the pipe safety rank, prolonged pipeline life.Owing to reduced corrosion resistant alloy tubing consumption, the defeated cost of oil gas extracting, gathering significantly reduces.Simultaneously prepare wear-resistant coating at the oil pipe end face, thereby having prevented effectively that end face is corroded reduces anti-wear performance.

Description of drawings

Fig. 1 is the structural representation of wear resistant corrosion resistant bimetallic composite oil pipe described in the utility model;

Fig. 2 is the sectional view of Fig. 1.

Wherein, steel pipe 1, self-melting alloy coating 2.

The specific embodiment

Below in conjunction with accompanying drawing the utility model is done further explanation.

Wear resistant corrosion resistant bimetallic composite oil pipe described in the utility model, comprise steel pipe body, tube outer surface coating and pipe internal surface coating, and tube outer surface coating and pipe internal surface coating can obtain the abrasion-proof corrosion-proof erosion resisting coating of 0.05～2mm by the spray fusing self-melting alloy; While oil pipe both ends of the surface are by spray fusing self-melting alloy coating or directly adopt the built-up welding nickel-base alloy.Wherein pipe internal surface and external surface coating adopt nickel base self-fluxing alloy powder, and the corrosive power of its anti-H 2 S, carbon dioxide and chlorion is more than 27～30 times of ordinary carbon steel pipe.And the hardness height of coating own can play wear-resistant effect, under the normal temperature, is 11～13 quilts of general carbon steel tube to the abrasion resistance of general grains of sand abrasion, is 8～10 times of stainless steel.Below the preparation method of main this bimetallic composite oil pipe of explanation be specifically described.

The inside diameter ranges of steel pipe is 20～200mm, and the steel tube surface thickness range is 3～20mm, and pipe range is 200～1200mm.At first with steel pipe process surface degreasing and sandblast pre-treatment, make its surperficial roughness control in 150～350 mu m ranges, thus can be so that the adhesion between the alloy coat that subsequent technique obtains and the steel pipe base material be best.To be fixed on through pretreated steel pipe then and carry out the high speed rotation on the revolution board, linear velocity is controlled between 800～2200mm/s, then steel pipe is preheated to 80～100 ℃.In addition with nickel base self-fluxing alloy powder with become slurry after bonding agent mixes according to a certain percentage.Then deeply manage interior described slurry is sprayed in steel tube surface by the extension of band pulverizing nozzle and form pre-coating.This pre-coating can also obtain by following 2 kinds of modes: 1, rise up in the pipe with the extension that has pulverizing nozzle, evenly spray liquid adhesive at pipe internal surface, and then the spraying of carrying out nickel base self-fluxing alloy powder forms pre-coating; 2, outer surface of steel tube can cover the self-fluxing alloyed powder heap by plasma or flame gun and form pre-coating.

After the steel pipe surfaces externally and internally has prepared pre-coating, with the sealing of the two ends mouth of pipe, to vacuumizing and insert protective gas in managing, as helium or nitrogen.Continue to keep the steel pipe rotation, utilize gas flame, high temperature furnace or Medium frequency induction machine that the pre-coating of steel pipe is carried out sintering, the temperature control of sintering is at 1000～1100 ℃, and after the cooling, steel tube surface namely forms metallurgical binding protectiveness alloy coat.

Composition to above-mentioned self-fluxing alloy powder describes below: self-fluxing alloy is a class spray coating alloy material commonly used, be to contain a certain amount of B, Ni-based, the iron-based of Si element and cobalt-base alloys are in order to improve coating performance, except B, Si also contains elements such as Cr, Cu.B reaches molten condition in the time of can reheating to the high temperature more than 1000 ℃ after the Si adding forms coating, when producing firm metallurgical binding with matrix, eliminates the pore in the coating, and gives full play to the superior function that sprayed on material possesses.B, the effect of Si element comprises: 1, as strong reductant, protection nickel, iron, element such as buy and avoid oxidation; Simultaneously, reduce the oxide of these elements, the borosilicate fusing point of formation is low, density is little, viscosity is little, is easy to float over coating surface, prevents coating oxidation.2, reduce fusing point, increase liquid-solid temperature range, improve the flowability of liquid metal.3, reduce surface tension, reduce angle of wetting, increase wettability.In addition, B, Si also have invigoration effect, B by with Ni, Cr formationization platform thing is realized dispersion-strengtherning, and Si reaches reinforcement by solid solution.This class self-fluxing alloy can be eliminated pore effectively by the remelting of coating, can form metallurgical binding securely with matrix, becomes widely used coating material.The remelting of coating can be used flame heat, or uses high-frequency induction heating, or heats in vacuum drying oven and carry out.

The protectiveness alloy coat that above-mentioned self-fluxing alloy powder is made has following characteristic: 1, corrosion resistance: the nickel-base alloy box cupling is through the processing of surface treatment; make surface applied one one functional layer; a large amount of alloying elements makes the raising of tens of times of corrosion resistances of coating; in the room temperature concentrated hydrochloric acid; its corrosion rate only demonstrates good etch resistant properties for 0.04mg/cm2h, is particularly useful for the hole condition of heavy corrosion, eccentric wear.2, anti-wear performance: nickel-base alloy rod collar, what adopt is nickel chromium triangle borosilicate series alloy, can be HRC35-65 according to user's needs production hardness range, and the hardness of common rod collar is generally HRc22-28, add the processing mode of the external surface employing grinding of nickel-base alloy rod collar, make the abrasion resistance number of nickel-base alloy rod collar decuple common rod collar.According to the test of units concerned, with the N80 oil pipe in the mill test, the wear extent of nickel-base alloy rod collar only is 1/4 of common rod collar under the no sand situation; The wear extent that contains nickel-base alloy rod collar under the sand situation only is 1/3 of common rod collar, if add the participation of corrosion, the wear extent of nickel-base alloy rod collar only is 1/30 of common rod collar.3, anti-attrition performance: because metallic nickel has self-lubricating property preferably, in the workplace of some frictions, nickel coating, nickel coating even can not use lubricant medium.Contain 70% nickel element in the coating of nickel-base alloy rod collar, its self-lubricating property is higher, adds high finish thereby has the good wear performance.According to the test of units concerned, with the N80 oil pipe in the mill test, the nickel-base alloy rod collar only is 1/2 of common rod collar to the wear and tear wear extent of oil pipe of oil pipe under the no sand situation; Contain nickel-base alloy rod collar under the sand situation wear extent of oil pipe wearing and tearing oil pipe only is 2/3 of common rod collar, if add the participation of corrosion, the nickel-base alloy rod collar only is 1/3 of common rod collar to the damage amount of oil pipe wearing and tearing oil pipe mill.4, reduced the oil pumper polished rod load: because alloy itself has low frictional factor, Productivity gives birth to the anti-attrition effect, has reduced the sucker rod frictional resistance in the stroke up and down, thereby has reduced the polished rod load of oil pumper, has realized purpose of energy saving.Use detection according to the scene, in some hole conditions, adopt the nickel-base alloy rod collar, oil pumper load can reduce 10-30%.5, anchoring strength of coating height: through the processing of Surface Engineering technology, the bond strength of coating and steel parent tube is several times as much as other Bond Strength of Coating up to 350Mpa.

The wear resistant corrosion resistant bimetallic composite oil pipe face coat of above-mentioned preparation and steel pipe base material form metallurgical binding, and bond strength is greater than 30MPa.

The above only is preferred embodiment of the present utility model; be noted that for those skilled in the art; under the prerequisite that does not break away from the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection domain of the present utility model.

Claims

1. the wear resistant corrosion resistant bimetallic composite oil pipe that covers of a full coat layer, it is characterized in that: the inner surface of described oil pipe and external surface spray fusing have the self-melting alloy coating; And the both ends of the surface spray fusing of described oil pipe has self-melting alloy coating or built-up welding that nickel-base alloy is arranged.

2. the wear resistant corrosion resistant bimetallic composite oil pipe that covers according to the described full coat layer of claim 1 is characterized in that: described self-melting alloy coating is Ni-based, iron-based or the cobalt-based self-melting alloy that contains B, Si element.

3. according to the wear resistant corrosion resistant bimetallic composite oil pipe of the described full coat layer covering of claim 1, it is characterized in that: the thickness of described self-melting alloy layer is 0.05～2mm.