CN201245700Y

CN201245700Y - Oil conduit ion nitriding furnace

Info

Publication number: CN201245700Y
Application number: CNU2008200907413U
Authority: CN
Inventors: 牛君
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-08-23
Filing date: 2008-08-23
Publication date: 2009-05-27
Anticipated expiration: 2018-08-23

Abstract

The utility model relates to an ion nitriding furnace for an oil pipe, which mainly solves the problem of ion nitriding performed only for the internal surface of the oil pipe and screw threads. The ion nitriding furnace adopts a vacuum furnace body 1, an isolating screen 2, an insulator 3 and the external surface of the oil pipe 5 without a diffusion layer part to form a closed body, and the external surface of the oil pipe 5 without the diffusion layer part is seepage-proof. The ion nitriding furnace is characterized in that the charging amount of the oil pipe is large, and the utilization rate of the ionic power supply power is high.

Description

A kind of oil pipe ion-nitriding furnace

Technical field:

The utility model relates to the nitriding furnace that handle the oil pipe surface in oil recovery field, oil field, especially a kind of nitriding furnace of only pipe inner surface and screw thread being handled.

Background technology:

Oil pipe exists many problems in the practical application of crude oil exploitation, as the erosion of the contained medium of crude oil, additive; Sucker rod moves reciprocatingly at tube inner wall, tubing length is mostly more than 1000 meters, because of the most number average of oil well at heavy Nogata to there being certain gradient, it is less to add the oil pipe diameter of bore, reasons such as tubing string linearity Accumulated deviation, sucker rod is to the wearing and tearing of tube inner wall; Impurity can be piled up in pipe inner surface absorption in the crude oil, and the oil pipe conveyance capacity is descended, and causes the obstruction of oil pipe etc.; Cause oil pipe to lose efficacy at short notice, have a strong impact on and restricted the crude oil exploitation.

At present, the oil pipe of the various serial different types of prior art production both at home and abroad, how its surfaces externally and internally does not do anticorrosion hardening treatment; Or just spraying or electroplate impregnating material on the surface, sintered glass liner and pulse Vacuum gas nitriding are handled.

The spray material bonding force is poor, occurs situation in uneven thickness in the spraying process easily, and when sucker rod pumped friction in oil pipe, the internal surface corrosion protection coating ground off easily, and loses antiseptic power.

Electroplate the impregnating material internal surface and occur pin hole easily, lose defectives such as plating the zone, easily make plated material and tube wall form galvanic corrosion; This corrosion even preceding even more serious than plating; Electrolytic coating is subjected to clean-up performance, the processing parameter of inner surface treatment, the influence of the quality of plated material own, and overlay coating peels off above oil well pump easily and deposits, even may enter the generation that causes the holddown accident in the tolerance clearance of the plunger of oil well pump and pump barrel.

Sintered glass (or pottery) liner, knock, bump, draw and the extruding friction of sucker rod etc. all multifactor down can be from the oil pipe surfacial spalling, and the material that peels off can fall into pump barrel, the lighter causes pump barrel and plunger scuffing, the serious generation that causes the holddown accident; Liner hardness is too high, and its limit, angle, shuttle, edge etc. are located and can be caused wearing and tearing to sucker rod and box cupling and centralizer etc., and especially the wearing and tearing to centralizer are fatefulue.

The weakness that the nitriding of pulse Vacuum pulse gas is handled, nitrided case fragility is big, and the chemical combination layer is loose; Because the length-to-diameter ratio of oil pipe is 9600:62.7=153.1, though adopt the nitriding of pulse Vacuum pulse gas, along with the extension of distance port depth reduces gradually, the nitride layer of oil pipe middle part endoporus can't satisfy service requirements.

Ion nitriding is that the desire parts processed is placed in the vacuum furnace body, under vacuum condition, fills with rarefied gas (as nitrogenous gas) in stove; Part connects the ion power supply negative electrode, and body of heater connects anode; Under the electric field action of hundreds of volts, rarefied gas is ionized in the stove, and the directed bump of positive ion negative electrode (part) makes piece surface produce glow discharge and is heated.Under certain atmosphere and certain temperature, piece surface is compound, the absorbed nitrogen atom, forms the nitrogenous layer of high density and entad portion's diffusion, through after a while, can obtain the needed nitride layer of processing requirement.

When the oil pipe ion nitriding, the most of outside surface of oil pipe does not need infiltration layer, and anti-seepage method is to adopt the surface that metal covers does not need infiltration layer in the prior art, makes positive ion can't clash into this surface and produces aura and achieve the goal; This method is simple, effectively, but described metal covering is connected with negative electrode, metal covering itself unavoidably is heated because of ionic bombardment generation aura; Its shortcoming has increased the power of ion nitriding, will waste a large amount of electric power undoubtedly if be used for the antiseepage of the most of outside surface of oil pipe.Described in addition metal covering is heated because of long-term ionic bombardment, and easy deformation needs frequent replacing also to be unfavorable for the long-term large batch of nitriding production of oil pipe.

The utility model content:

In order to overcome disadvantages of background technology, the utility model provides a kind of oil pipe ion-nitriding furnace, this nitriding furnace shields the oil pipe outside surface in the ionitriding process do not need the infiltration layer part, and the shield surface does not produce aura, can carry out ionitriding to pipe inner surface and screw thread smoothly, it is big to have the oil pipe batch, the characteristics that the ion power supply power utilization is high.

The technical solution of the utility model is: this oil pipe ion-nitriding furnace comprises vacuum furnace body and the intravital oil pipe of vacuum oven, there is anode to pass in the oil pipe, oil pipe connects the negative electrode of power supply, anode connects the anode of power supply, the anode and cathode insulation is arranged between the two ends of oil pipe and the anode, outer wall between the screw thread of oil pipe two ends is covered with isolated screen, and isolated screen and oil pipe are insulated by isolator, and vacuum furnace body is connected with inlet pipe and vacuum pump.

The utlity model has following beneficial effect: owing to take such scheme, through its chemical combination layer densification of oil pipe of ionitriding, nitrided case fragility is little, and the infiltration layer phase constitution is controlled, and can form the infiltration layer of elements such as titaniferous, silicon, chromium, have good anticorrosive, wear resisting property; The surface is through high-energy ion bombardment, and frictional coefficient descends, and anti-seizure performance is significantly improved; Isolated screen 2 isolators 3 and oil pipe 5 outside surfaces do not need infiltration layer partly to constitute closed shape when ion infiltrates, make oil pipe 5 outside surfaces not need the infiltration layer part not produce aura and reach the antiseepage purpose, thereby improve oil pipe 5 batches, because the antiseepage thing is additive decrementation electric power not, and the ion power supply power utilization is improved.

Description of drawings:

Accompanying drawing 1 is a structural representation of the present utility model.

The 1-vacuum furnace body, 2-isolated screen, 3-isolator, 4-anode, 5-oil pipe, 6-power supply, the insulation of 7-anode and cathode, 8-vacuum pump, 9-inlet pipe, 10-variable valve.

Embodiment:

The utility model is described in further detail below in conjunction with accompanying drawing:

By shown in Figure 1, this oil pipe ion-nitriding furnace utilizes vacuum furnace body 1, isolated screen 2 and isolator 3 not to need infiltration layer partly to form closed shape at oil pipe 5 outside surfaces; Vacuumize body of heater 1 to vacuum 1-300Pa with vacuum pump 8, adjustments of gas variable valve 10 feeds working gas (as ammonia by inlet pipe 9 as required simultaneously, nitrogen, hydrogen, liquid evaporation thing etc.), anode 4 is in oil pipe 5 inside, oil pipe 5 is connected power supply 6 negative electrodes (utmost point), anode 4 is connected power supply 6 the anodes (+utmost point), power supply 6 voltages increase to certain value (400V-1000V) and connect the oil pipe 5 of power supply 6 negative electrodes (utmost point) and connect between the anode 4 of power supply 6 the anodes (+utmost point) because of rarefied gas ionization produces glow discharge, and oil pipe 5 surfaces that connect power supply 6 negative electrodes (utmost point) aura occurs and are heated and begin ion and infiltrate process; Because the existence of the closed shape that isolated screen 2, isolator 3 and oil pipe 5 outside surfaces are formed makes oil pipe 5 outside surfaces not need the infiltration layer part not produce aura and reaches the antiseepage purpose.Isolator 3 plays insulating effect between oil pipe 5 outside surfaces and isolated screen 2; Anode and cathode insulation 7 plays insulating effect between oil pipe 5 internal surfaces and anode 4.Anode and cathode insulation 7, isolator 3 are 〉=600 ℃ high-temperature insulation material, and isolated screen 2, anode 4 are ferrous materials.

Claims

1, a kind of oil pipe ion-nitriding furnace, comprise the oil pipe (5) in vacuum furnace body (1) and the vacuum furnace body (1), it is characterized in that: have anode (4) to pass in the oil pipe (5), oil pipe (5) connects the negative electrode of power supply (6), anode (4) connects the anode of power supply, anode and cathode insulation (7) is arranged between the two ends of oil pipe (5) and the anode (4), outer wall between the screw thread of oil pipe (5) two ends is covered with isolated screen (2), isolated screen (2) is insulated by isolator (3) with oil pipe (5), and vacuum furnace body (1) is connected with inlet pipe (9) and vacuum pump (8).