CN2360182Y

CN2360182Y - Thermal straightening appts. of prestressed thermal insulating oil pipe

Info

Publication number: CN2360182Y
Application number: CN 99222420
Authority: CN
Inventors: 张显文; 孙能福; 张艳; 杨世国
Original assignee: MECHANICAL REPAIR AND Manufacturing GROUP Co LIAOHE PETROLEUM EXPLORATION BURCAU
Current assignee: MECHANICAL REPAIR AND Manufacturing GROUP Co LIAOHE PETROLEUM EXPLORATION BURCAU
Priority date: 1999-01-04
Filing date: 1999-01-04
Publication date: 2000-01-26
Anticipated expiration: 2009-01-04

Abstract

The utility model provides a thermal straightening device of a pre-stressed thermal insulating oil pipe, which is a tool used for thermal recovery and steam injection of thick oil in an oilfield. The problem of pipe body damage because of using a cold alignment method can be overcome. The utility model is characterized in that a workpiece (the pre-stressed thermal insulating oil pipe) enters a pipe frame through a rollaway nest; a heating core rod is inserted in an inner hole of the workpiece; the position of the workpiece on the pipe frame is determined by a spacing roller; the workpiece is connected with the heating core rod by an electric clamp; output voltage of a transformer is the alternate current 15-25 V; heating temperature of the heating core rod is collected by an electric thermal couple and is sent into a control cabinet to control the on-off of the transformer. The utility model has the characteristics of non damage of alignment of the pipe body, high heating efficiency, achievement of simultaneous multiple working positions alignment, etc.

Description

Give the hot coalignment of stress insulated tubing

The instrument that the utility model provides a kind of oil-field thick-oil thermal recovery steam injection to use gives the hot coalignment of stress insulated tubing.

Present domestic oil field is given the stress insulated tubing and mainly is welded into two-layer pipe by interior pipe and outer tube, and giving earlier internally before welding, pipe has applied tension.Owing to setting upright reasons such as not in place between the inner and outer pipes, the tension of giving of interior pipe makes outer tube be in instability status, thereby make outer tube occur buckling phenomenon easily, past all is to take straightener to carry out more straight with the straighten while cold method to body, body has been caused damage to a certain degree, increase residual stress, and original stress that gives has been destroyed to some extent, therefore influenced the quality of pipe.

Problem at above-mentioned existence, the designer is according to years'experiences and with reference to interrelated data, analyzed the reason of giving the bending of stress insulated tubing and adopt straightener to carry out the alignment meeting body is caused to a certain degree shortcomings such as damage with the straighten while cold method, be developed into and given the hot coalignment of stress insulated tubing, this device the experiment proved that, can realize the alignment of body not damaged.

If give stress insulated tubing curved major owing to give first internally pipe before the inner and outer pipes solder bond and applied tension and make outer tube be in that instability status causes, if this stress release, inner and outer pipes still can keep original glacing flatness, plastic deformation can not take place, based on above-mentioned design philosophy, the utility model is achieved in that to be bought at first from the market by all material of designing requirement and parts processing pipe support 5, workpiece (giving the stress insulated tubing) 2, heating plug 4, raceway 1, switch board 6, electric clamp 7, limited roller 9 are bought thermocouple 3, transformer 8; Workpiece (giving the stress insulated tubing) 2 entered in the process of pipe support 5 through raceway 1, in workpiece 2 endoporus, insert heating plug 4, workpiece 2 is determined by the limited roller on the corresponding station 9 in the position on the pipe support 5, and require crooked position up, pipe 14 in the 15-25v low-voltage alternating current power supply heating of heating plug 4 employing transformers 8 outputs of placing in the pipe, heating plug 4 is connected with workpiece 2 and constitutes the closed-loop path with 8 liang of outputs of transformer by electric clamp 7, and the main heat that utilizes the kelvin effect between heating plug 4 and inboard wall of tube body to produce is heated to certain temperature to interior pipe.Use thermocouple 3 to gather interior pipe heating-up temperature, and temperature signal delivered to switch board with pipe heating-up temperature in controlling, choose corresponding heating-up temperature according to the size of giving stress, pipe makes inner and outer pipes be in free state in the heating, be incubated 30 minutes to 1 hour, then workpiece is lain in a horizontal plane in and have on 3 pipe supports, treat to reach after the room temperature slow cooling purpose of alignment with upper support.Above-mentioned each parts combination and constituted and give the hot coalignment of stress insulated tubing.

The utility model compared with prior art adopts this device alignment, and body does not have any damage, and this device adopts collection skin mode of heating simultaneously, and the efficiency of heating surface is higher, and can realize multistation alignment simultaneously, has higher production efficiency.

Fig. 1 gives the hot coalignment schematic diagram of stress insulated tubing, and 1 is raceway among the figure, and the 2nd, workpiece, the 3rd, thermocouple, the 4th, heating rod, the 5th, pipe support, the 6th, switch board, the 7th, electric clamp, the 8th, transformer, the 9th, limited roller.

Fig. 2 is a heating plug schematic diagram, and 10 is electric clamp joints among the figure, the 11st, and steel pipe, the 12nd, dead ring.

Fig. 3 gives stress insulated tubing schematic diagram, and 13 is box cuplings among the figure, and the 14th, interior pipe, the 15th, centering ring, the 16th, heat-barrier material, the 17th, outer tube.

Describe the utility model below in conjunction with accompanying drawing in detail by embodiment: at first buy material and accessory, again by designing requirement processing pipe support 5, raceway 1, switch board 6, electric clamp 7, limited roller 9 by designing requirement from market; Processing heating plug 4: it is by electric clamp joint 10, and steel pipe 11, dead ring 12 are formed (as Fig. 2); Electric clamp joint 10 is to process with red copper or brass, adopts 6 fens steel pipes to be processed into steel pipe 11, makes dead ring 12 with the 95# diamond spar.Purchase electroheat pair 3, transformer 8 are combined into the utility model.Workpiece 2 (giving the stress insulated tubing) sees the double-decker that Fig. 3 mainly is made up of box cupling 13, interior pipe 14, centralizer 15, heat-barrier material 16, outer tube 17 for details, interior pipe 14 with outer tube 17 solder bond before give earlier internally that pipe has applied tension.Promptly form the utility model by the above.Owing to setting upright reasons such as not in place between the inner and outer pipes, the tension of giving of interior pipe 14 makes outer tube 17 be in instability status, thereby it is crooked that outer tube 17 is occurred, and therefore needs to carry out hot alignment with this device; Enter at workpiece (giving the stress insulated tubing) 2 and to insert heating plug 4 in the process of raceway 1, the position of workpiece 2 on pipe support 5 determined by limited roller 9, workpiece 2 is connected by electric clamp 7 with heating plug 4, power transformation device 8 output voltage 15-25v, pipe 14 in the heating, the heating-up temperature of heating plug 4 is gathered by electroheat pair 3, and sends into switch board 6, the break-make (see figure 1) of switch board 6 output signal control transformers 8 can be finished the hot alignment work of giving the stress insulated tubing like this.

Claims

1, the instrument used of a kind of oil thermal recovery steam injection gives the hot coalignment of stress insulated tubing, constitute by raceway (1), thermocouple (3), heating plug (4), pipe support (5), switch board (6), electric clamp (7), transformer (8), limited roller (9), it is characterized in that:

A, workpiece (2) is entered pipe support (5) through raceway (1), insert heating plug (4) in workpiece (2) endoporus, the position of workpiece (2) on pipe support (5) determined by the limited roller on the corresponding station (9), and horizontal positioned, and crooked position up;

B, pipe (14) in the 15-25v low pressure Flow varying power supply heating of heating plug (4) employing transformer (8) output of placing in workpiece (2) pipe, make inner and outer pipes be in free state, heating plug (4) be connected with workpiece (2) and with two outputs of transformer (8) by electric clamp (7) formation closed-loop path;

C, heating plug 4 is by the electric clamp made from red copper or brass (10), steel pipe (11) and the dead ring made from the 95# diamond spar (12) are formed.