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About Huafu
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PRODUCT INTRODUCTION
After an oxygen-free copper rod is drawn and straightened, insulating and packing layers are mechanically wound, which is then subjected to sintering in an electric furnace to make the insulating layer integrated. After being pulled through a tubing, welded and drawn, the cable is made. The cable section is shown in the lower right figure. Because steel tubing is used as the sheath, the easily damaged surface is completely protected.
- FEATURES & BENEFITS
- HOW IT WORKS
- TECHNICAL INFORMATION
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- Commodity name: Coiled tubing sheathed heating cable
- Commodity ID: z100
- 副标题: PRODUCT INTRODUCTION
After an oxygen-free copper rod is drawn and straightened, insulating and packing layers are mechanically wound, which is then subjected to sintering in an electric furnace to make the insulating layer integrated. After being pulled through a tubing, welded and drawn, the cable is made. The cable section is shown in the lower right figure. Because steel tubing is used as the sheath, the easily damaged surface is completely protected.
FEATURES & BENEFITS
The skin effect brings two benefits. One is to reduce the cross-sectional area of the current passing through the steel pipe and increase the AC impedance. Therefore, a greater heating power can be obtained with a smaller heating current. The other is that there is only leakage voltage and current on the outer surface of the steel tubing, and so the system is very safe.
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HOW IT WORKS
When single-phase alternating current passes through the copper core of heating cable and the outer wall of its steel tubing, the current produces skin effect on the steel tubing. The current flows concentratedly at a certain depth of the inner wall of the steel tubing, while the outer wall is not charged. Thus, a good insulation structure is formed by itself. The series circuit composed of the steel tubing sheath and the copper core of the heating cable forms the heating body of skin effect. When alternating current passes through the copper core of cable and steel tubing, magnetic flux is generated in the steel tubing, and eddy current is generated under the action of alternating magnetic flux. The directions of circuit current I1 and I2 and eddy current I3 and I4 are shown in the figure. If the effect of magnetic flux leakage is ignored, I2=I4, but their directions are opposite, which offset each other. In fact, there is only current I1 and I3 acting on the copper core and steel pipe.
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TECHNICAL INFORMATION
Cable parameters
- Rated voltage: 1,000 V, 1,500 V, 2,000 V and 2,500 V. The cable can also be customized according to different requirements
- Cable OD: 12mm, 16mm, 18mm, 25.4mm and 32mm
- Conductor cross-sectional area: To be designed according to different uses
- Working temperature: 120 °C, 200 °C and 250 °C
- Structure: Single-core cable (for skin effect heating), coaxial cable and three-core cable (for power supply)
- Protective tubing material: 16Mn steel. Other material can also be designed according to different requirements.
- Core wire material: Oxygen-free copper and aluminum
- Tensile strength of 16Mn steel armor sheath: 470-666 MPa
Cable use
- Paraffin removal and control, viscosity reduction and heating for oil wells (rod-pumped well, progressive cavity pumped well and flowing well);
- Storage tank heating;
- Electric heat tracing for surface and buried pipelines;
- Power transmission for downhole heating equipment; and
- Other electric heating fields.
Working with coiled tubing sheathed heating cable
RELATED PRODUCTS
Electric heating technology to remove paraffin and reduce the viscosity of oil is to run heating cable (coiled tubing sheathed cable or rubber insulated cable) into the tubing or hollow sucker rod (with a hollow section at the upper part). The system is powered from the surface. Under the effects of skin effect and proximity, the coiled tubing sheathed cable or hollow sucker rod becomes heated to improve the temperatures of fluid flow and wellbore equipment. For a well having the problem of precipitated paraffin, the paraffin can be melted by heating, and then removed and controlled. Thus, oil heating and paraffin removal and control are realized in the process of lifting. Depending on the situation of paraffin precipitation in wellbore and the change in oil production, timing for powering up cable to remove paraffin can be selected. Meanwhile, the recovery of production is observed to determined the paraffin removal effect. Running of the electric heating system shall be stopped immediately after the expected effect is achieved. In this way, continuous or intermittent paraffin removal is realized. For a heavy oil well, heating reduces the viscosity of heavy oil to improve its fluidity, realizing the purpose of continuous production. This technology is widely applicable to various rod wells, rodless wells or flowing wells.
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Mobile electric ignition system and operation equipment
A mobile electric ignition system comprises a central electric heater connected to the lower part of an equal-diameter coiled tubing sheathed cable. A coiled tubing conveyed igniter is lowered to the target layer in the wellbore to heat the perforated interval by using coiled tubing operation equipment, so that temperature of the near-wellbore zone of the well section rise to over the spontaneous combustion point of the combustible medium in the oil layer.
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Pipeline SECT (heating) technology is a new metal pipeline heating method that appeared in the middle of the last century. It is a new technology and process for the heating and thermal insulation of heated transmission pipelines of large petrochemical enterprises, which is suitable for the heat tracing and heating of all long, medium and short distance metal liquid transmission pipelines, featuring high efficiency, safety, high reliability, and convenient installation and maintenance. Therefore, it is widely used in the pipeline transportation of various liquids with different properties.
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