CN2313352Y

CN2313352Y - Externally vertical-dressing three-phase vortex and internal-resistance exothermal armoured heating cable for oil pipe of oil-well

Info

Publication number: CN2313352Y
Application number: CN 97201310
Authority: CN
Inventors: 李文恒
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-02-17
Filing date: 1997-02-17
Publication date: 1999-04-07
Anticipated expiration: 2007-02-17

Abstract

The utility model relates to an externally vertical-dressing three-phase vortex and internal-resistance exothermal armoured heating cable for oil pipes of an oil well. The interior of the cable has three component wires; the exterior of each component wire is coated with an insulating layer, a sealed water layer and a corrosion proof layer; the outermost layer of the cable is a steel belt armoured protective layer; the exterior of each component wire in the cable is also coated with a layer of outer sleeve weaved by steel wires. The utility model has the advantages that an alternating magnetic field generated by alternating current in the component wire is acted on the outer sleeve weaved by steel wires to form a vortex; the heat generated by the vortex together with the heat generated by the internal resistance of the component wire heats for the oil pipes; the heating effect is better; the service life of the insulating layer of the component wire can be enhanced; the mechanical intensity of the cable can be increased.

Description

Upright outward three-phase vortex and the internal resistance heating armouring heating cable of applying of oil well oil conduit

The utility model relates to the device to the heating of the oil pipe in the oil well, particularly, is meant upright three-phase vortex and the internal resistance heating armouring heating cable of applying of a kind of oil well oil conduit outward.

Petroleum industry always is the indispensable heavy industry of the national economic development, therefore, countries in the world all take much count of the exploitation of oil, the method of recover petroleum is a lot, but its essential principle is nothing more than being to erect an oil pipe in oil well, and insert in the oil of oil well inner bottom part the lower end of oil pipe, and the upper end of oil pipe stretches out in outside the oil well, link to each other with oil pipe with oil pumper, start oil pumper and just the oil in the oil well can be extracted out by oil pipe.But our road, oil in oil well has three high one low characteristics, it is high-consistency, high viscosity, height contains cured, the characteristics of low temperature, the depth bounds of oil well generally at 300 meters in 1,500 meters, therefore, the crude oil of this thickness is not easy to extract out very much, in order to improve the efficient of oil pumper, increases the output of oil, present way is to lay heating cable outside oil pipe, the outer tube wall of heating cable and oil pipe is close to, and by the heating of heating cable, the oil temperature in the oil pipe is raise, denseness is thinning, viscosity diminishes, and such oil is easier to be extracted out by oil pumper, and the heating cable that uses is internal resistance heating armouring heating cable at present.

The structure of this cable is: the penetralia of cable is three heart yearns, and the external packets of every heart yearn is wrapped with insulating barrier, and this layer is generally manufactured with the polyimide insulative band, in the insulating barrier outside, is enclosed with the sealing water layer, and the general acrylonitrile-butadiene rubber that uses of this layer manufactured.External packets at the sealing water layer is wrapped with anti-corrosion layer; this layer is general to use poly-Teflon tap to manufacture; be with a steel belt protection layer three heart yearn outsides; be commonly called as armor; this armor is wrapped in three heart yearns wherein; outermost layer as cable; the heating principle of this cable is when three heart yearns of cable inside are connected with the live wire of three-phase power line respectively; just there is alternating current to flow through heart yearn; any alternating current can be regarded DC component as; synthesizing of fundametal compoment and higher harmonic components, therefore, when alternating current flows through heart yearn; because the effect of heart yearn internal resistance; also can generate heat, the heat that sends satisfies Joule law W=I*I*R, the heat that promptly sends equal DC component square with the product of the internal resistance of heart yearn; therefore this cable is internal resistance heating armouring heating cable, and this cable has following two shortcomings:

(1). the distance between the outermost steel band armor of heart yearn and the cable protective layer is far away; the heat that the heart yearn internal resistance is sent also will be passed through insulating barrier, sealing water layer, anti-corrosion layer; just can pass on the outermost steel band armor of the cable protective layer; therefore; the efficient that heat is transmitted is not high; and heart yearn internal resistance heating also makes the insulating barrier of heart yearn outside wear out the useful life of having reduced insulating barrier easily.

(2). the heat that the heart yearn internal resistance is sent out has only been used the DC component of alternating current, and most of energy of alternating current is not used to heating.

The purpose of this utility model is to provide a kind of oil well oil conduit upright three-phase vortex and the internal resistance heating armouring heating cable of applying outward, it has done the improvement of structure on original cable basis, make heating efficiency raising by the alternating current of cable core, and the useful life that can improve the insulating barrier of heart yearn.

The purpose of this utility model is achieved in that

Upright outward three-phase vortex and the internal resistance heating armouring heating cable of applying of a kind of oil well oil conduit; there are three heart yearns the inside of this cable; the outside of every heart yearn is wrapped with insulating barrier, sealing water layer, anti-corrosion layer; the outermost layer of cable is a steel band armor protective layer; this steel band armor protective layer is wrapped in three heart yearns wherein, it is characterized in that: the outside of every heart yearn also is wrapped with the overcoat of layer of steel wire establishment in cable.

The utility model has following positive beneficial effect:

1. the outside of the every piece heart yearn of cable of the present utility model in original cable has increased the overcoat of layer of steel wire establishment again, when passing through alternating current in the heart yearn, space around the heart yearn will form alternating magnetic fields, this action of alternating magnetic field is outer the putting of this steel wire establishment, can produce induced current, this induced current is closed voluntarily in conductor, therefore be eddy current again, because the overcoat of this steel wire establishment is a conductor, so its internal resistance is very little, eddy current is very big, can produce a large amount of heats, the heat that eddy current produces can make the better effects if of heating with the heat addition rail heating that original heart yearn internal resistance produces.

2. cut down law as can be known by Ohm's law and Biot's sand, the size of conductor induced currents is directly proportional with the rate of change of magnetic flux, so the intensity of eddy current is directly proportional with the frequency of alternating current, the heat that is the eddy current generation is relevant with the frequency of alternating current, therefore, in the utility model, if desire improves the heat of heating cable, can be by improving the frequency of the alternating current in the heart yearn, the intensity of eddy current is increased, the heat that eddy current produces also can increase, and in the original cable if will increase the caloric value of cable, have only the current strength that increases the alternating current that passes through in the heart yearn, and the current strength of alternating current is big more, just the easy more insulating barrier that will wrap up heart yearn burns, and therefore design of the present utility model can make the life-span of core insulation layer increase.

3. the outermost layer that the overcoat of steel wire establishment of the present utility model more approaches cable is a steel band armor protective layer; and insulating barrier; sealing water layer and anti-corrosion layer are all in the inside of the overcoat of this steel wire establishment; the barrier that does not have heat to transmit in the outside of the overcoat of this steel wire establishment, so the outer eddy current Re Gengyi that puts generation of this steel wire establishment passes to the oil pipe of cable outside.

4. the overcoat of this steel wire establishment is netted, and certain toughness is arranged, and has strengthened the mechanical strength of cable, can make cable wear-resisting wiping in the down-hole, anti-extruding, anti-collision.

Now in conjunction with the accompanying drawings the utility model is described in further detail as follows with preferred embodiment:

Fig. 1 is a structure cutaway view of the present utility model:

Figure number partly is

1. 2. insulating barrier (polyimide insulative band 0.2mm5 layer) of heart yearn (copper stranded conductor 10mm2)

3. seal 4. anti-corrosion layer (poly-Teflon tap 0.2mm4 layer) of water layer (acrylonitrile-butadiene rubber 0.6mm is thick)

5. the overcoat (steel wire establishment armor eddy-current heating cover) of 6. steel wires establishment is overlapped in the glass fiber establishment

7. the outermost layer of glass fiber rope filler 8. cables (steel band armor protective layer).

See also Fig. 1, upright outward three-phase vortex and the internal resistance heating armouring heating cable of applying of oil well oil conduit of the present utility model, there are three heart yearns the inside of this cable, and the outside of every heart yearn 1 is wrapped with insulating barrier 2 successively, and this layer is generally made with the polyimide insulative band; Sealing water layer 3, this layer is generally made with acrylonitrile-butadiene rubber; Anti-corrosion layer 4, this layer is generally made with poly-Teflon tap.The outermost layer of cable is a steel band armor protective layer 8, it is characterized in that: the outside of every heart yearn 1 also is wrapped with the overcoat 6 of layer of steel wire establishment in cable.

In preferred embodiment, the overcoat 6 of this steel wire establishment is in the outside of anti-corrosion layer 4.Among Fig. 15 is glass fiber establishment cover, and 7 is glass fiber rope filler, and the purpose of using glass fiber is the good heat-transfer because of glass fiber, and high temperature resistant.

The outside of the every piece heart yearn 1 of cable of the present utility model in original cable has increased the overcoat 6 of layer of steel wire establishment again, when passing through alternating current in the heart yearn 1, space around the heart yearn 1 will form alternating magnetic fields, this action of alternating magnetic field is on the overcoat 6 of steel wire establishment, because the overcoat 6 of steel wire establishment is a conductor, so its internal resistance is very little, can produce very big eddy current, eddy current can produce a large amount of heats, the heat that eddy current produces can make the better effects if of heating with the heat addition rail heating that original heart yearn 1 internal resistance produces.

Cut down law as can be known by Ohm's law Biot sand, the size of conductor induced currents is directly proportional with the rate of change of magnetic flux, so the intensity of eddy current is directly proportional with the frequency of alternating current, the heat that is the eddy current generation is relevant with the frequency of alternating current, therefore, in the utility model, if desire improves the heat of heating cable, can be by improving the frequency of the alternating current in the heart yearn 1, the intensity of eddy current is increased, the heat that eddy current produces also can increase, and in original cable if will increase the caloric value of cable, have only the electric current degree of increasing that increases the alternating current that passes through in the heart yearn 1, and the current strength of alternating current is big more, just the easy more insulating barrier 2 that will wrap up heart yearn 1 burns, and therefore design of the present utility model will increase the life-span of the insulating barrier 2 of heart yearn 1;

The outermost layer that the overcoat 6 of steel wire establishment of the present utility model more approaches cable is a steel band armor protective layer 8; and insulating barrier 2; sealing water layer 3 and refractory layer 4 are all in the inside of the overcoat 6 of steel wire establishment; the barrier that the outside of this overcoat 6 does not have heat to transmit, so the eddy current Re Gengyi that produces on the overcoat 6 of this steel wire establishment passes to the oil pipe of cable outside.

The overcoat 6 of this steel wire establishment is netted, and certain toughness is arranged, and has strengthened the mechanical strength of cable, can make the wear-resisting wiping of cable in the down-hole, anti-extruding, anti-collision.

A bit be noted that in addition in addition: be connected with a phase firewire of three-phase alternating current respectively in every heart yearn 1 in the cable; electric current in the three-phase firewire is mutual deviation 120 degree on phase place; if on every heart yearn 1, do not add the overcoat 6 of the silk establishment of raising to the higher plane of principle; so; the magnetic field intensity of the resultant magnetic field that the alternating current in three heart yearns is set up in the space is zero; therefore; when three heart yearns in original cable connect a phase firewire of three-phase alternating current respectively; the active force that on the outermost steel band armor protective layer 8 of cable, does not have alternating magnetic field; can not produce eddy current in this steel band armor protective layer 8; has only the use the technical solution of the utility model; every heart yearn 1 is all put the overcoat 6 of layer of steel wire establishment; because of only being connected with a cross streams in the every heart yearn 1; alternating current can produce alternating magnetic field; this alternating magnetic field can produce induced current on the overcoat 6 of steel wire establishment; the eddy current that promptly is commonly called as; eddy current can produce a large amount of heat; make the cable heating; so the utility model is based on eddy-current heating; heart yearn 1 internal resistance heating is auxilliary, has only the mode of heart yearn 1 internal resistance heating to compare obvious improvement with in the past cable.

Claims

1. an oil well oil conduit stands outward and applies three-phase vortex and internal resistance heating armouring heating cable; there are three heart yearns the inside of this cable; the outside of every heart yearn is wrapped with insulating barrier, sealing water layer, anti-corrosion layer; the outermost layer of cable is a steel band armor protective layer; this steel band armor protective layer is wrapped in three heart yearns wherein, it is characterized in that: the outside of every heart yearn also is wrapped with the overcoat of layer of steel wire establishment in cable.