CN1113067A

CN1113067A - Heating cable with automatic temp. control for oil well use

Info

Publication number: CN1113067A
Application number: CN 95102083
Authority: CN
Inventors: 张献芳; 杜振路; 赵庆芳
Original assignee: SHIJIAZHUANG CITY POWER CABLE FACTORY
Current assignee: SHIJIAZHUANG CITY POWER CABLE FACTORY
Priority date: 1995-03-08
Filing date: 1995-03-08
Publication date: 1995-12-06

Abstract

The cable has a self-temp.-control heating layer with positive temp. coefficient (PTC) of resistivity, and three equally spaced parallel conductors as electrodes which are installed in the heating layer of the PTC material, furthermore, a tensile steel wire with outer insulation layer can be installed among the three electrodes, the PTC material layer is surrounded with an insulation layer and an armored layer; it can be heated by three phase source with high power and high heat capacity, it restricts the temp. automatically, and has high tensile strength, it is suitable for use in oil wells.

Description

Heating cable with automatic temp. control for oil well use

The present invention relates to a kind of self temperature control heating tape.

Existing self temperature control heating tape begins development and production by U.S. RAYCHEM company in the sixties, it is a kind of novel electric heating device, the ribbon feeder of shape such as used as television, it is electrode with two at a distance of parallel lead, and electrode clads outward has semi-conductor electricity thermal plastic high polymer material and the oversheath that positive temperature coefficient of resistivity is a ptc characteristics behind crosslinking with radiation.On the devices such as self temperature control heating tape is flexible to be wrapped in needs to heat, insulation, anti-condensation, antifreeze pipeline, valve, the pump housing, basin, have automatic heating, regulate power and limit characteristics such as temperature automatically automatically, easy to use, remarkable energy saving effect is arranged.Chinese patent CN 87102924 " siding temperaturing heating belt production method and products thereof automatically " discloses the relevant technologies content.But the power of existing self temperature control heating tape is limited, and it is less self to hale intensity, is not suitable for using in specific occasions such as high viscosity heavy oil wells.

The purpose of this invention is to provide a kind of big, intensity oil well self controlled heating cable higher, safe in utilization of thousands of rice dark occasion, power such as high viscosity heavy oil well that places.

Is electrode with three at a distance of parallel lead for finishing the self temperature control heating tape that goal of the invention designs, distance equates between three leads, be isosceles triangle and distribute, and place the semi-conductor electricity thermal plastic high polymer material layer that has ptc characteristics behind the same cross-linking radiation, also cladding has oversheath.Because with three leads is electrode, can use the three phase mains on the oil well, power is higher, and caloric value is big, can satisfy the instructions for use of high viscosity heavy oil well.

The present invention is circle, also can be made into triangle or polygon with the cross section of the self temperature control heating tape that three leads are electrode, and its intensity, particularly tensile strength obviously improve.The unlikely fracture accident that takes place because of pulling force is excessive when using for the deep-well more than km also can make the lead centre of three equidistant parallels of self temperature control heating tape of the present invention that the tension steel wire rope is arranged, and the tension steel wire rope clads insulating protective layer outward.

In order to adapt to different power requirements; three leads of self temperature control heating tape of the present invention can place among the insulating blanket near middle tension steel wire rope part; remainder places with the semi-conductor electricity thermal plastic high polymer material layer that has ptc characteristics behind cross-linking radiation, and insulating blanket can be a same material with the insulating protective layer outside the tension steel wire rope.

Be the damaged electric leakage of oversheath of avoiding self temperature control heating tape, having the oversheath that clads outside the semi-conductor electricity thermal plastic high polymer material layer of ptc characteristics behind crosslinking with radiation can be made up of insulating barrier and the armour outside it.

Embodiment describes the present invention below in conjunction with accompanying drawing.

Fig. 1 is one of an embodiments of the invention oil well self controlled heating cable cross sectional representation.

Fig. 2 has the oil well self controlled heating cable cross sectional representation of tension steel wire rope for two of the embodiment of the invention.

Fig. 3 is a most preferred embodiment schematic diagram of the present invention.

As shown in Figure 1, oil well is electrode 1 with self controlled heating cable by the lead of three equidistant parallels, and has on the semi-conductor electricity thermal plastic high polymer material layer 2 of ptc characteristics after placing crosslinking with radiation, its outer cladding oversheath 3.

As shown in Figure 2, the outer cladding of tension steel wire rope 4 insulating protective layers 5 place in the middle of three electrodes 1, and three electrodes 1 place the semiconductor material layer 2 inside and outside cladding oversheaths 3 that have ptc characteristics behind the crosslinking with radiation.

As shown in Figure 3; tension steel wire rope 4 outer cladding insulating protective layers 5; the part of the close middle tension steel wire rope 4 of three electrodes 1 places cladding among the insulating blanket 6 of insulating protective layer 5 outsides; remainder places the material layer 2 that has ptc characteristics behind cross-linking radiation, and ptc layer has insulating barrier 7 and armour 8 outward.

Claims

1, a kind of self temperature control heating tape, is electrode with two at a distance of parallel lead, electrode clads semi-conductor electricity thermal plastic high polymer material and the oversheath that has ptc characteristics behind crosslinking with radiation outward, be flat belt-like, it is characterized in that said self temperature control heating tape is electrode with three at a distance of parallel lead, distance equates between three leads, and places the semi-conductor electricity thermal plastic high polymer material layer that has ptc characteristics behind the same cross-linking radiation.

2, self temperature control heating tape according to claim 1 is characterized in that there is the tension steel wire rope lead centre of said three equidistant parallels, and the outer cladding of tension steel wire rope has insulating protective layer.

3, self temperature control heating tape according to claim 2, it is characterized in that said three leads partly place among the insulating blanket near middle tension steel wire rope, remainder places with the semi-conductor electricity thermal plastic high polymer material layer that has ptc characteristics behind crosslinking with radiation.

4,, it is characterized in that the oversheath of cladding outside the said semi-conductor electricity thermal plastic high polymer material that has ptc characteristics behind crosslinking with radiation is made up of insulating barrier and the armour outside it according to claim 1 or 2 or 3 described self temperature control heating tapes.