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Segmented differential electric heating cable

An electric heating and differentiated technology, applied in the shape of heating elements, wellbore/well parts, isolation devices, etc., can solve the problems of low temperature at the pump inlet, unsatisfactory viscosity reduction effect, and difficulty in pumping crude oil effectively , to achieve the effect of improving the heating effect

Inactive Publication Date: 2014-12-31
CHINA PETROLEUM & CHEM CORP +1
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AI Technical Summary

Problems solved by technology

In actual application, the temperature at the wellhead is high and the temperature at the pump inlet is low. Especially for oil wells with high viscosity of crude oil, this heating method has a poor viscosity reduction effect and cannot effectively solve the problem of difficulty in pumping crude oil.

Method used

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  • Segmented differential electric heating cable

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Embodiment Construction

[0016] The detailed description and technical content of the present invention are described below with the accompanying drawings, but the accompanying drawings are only provided for reference and description, and are not intended to limit the present invention.

[0017] Refer to attached figure 1 , segmented and differentiated electric heating cables, including the pump-up cable 1 and the pump-down cable 3 respectively arranged above and below the annulus pump 2 in the wellbore during crude oil lifting. The heating power per meter of the cable under the pump is greater than the heating power per meter of the cable above the pump, forming differentiated heating for upper and lower sections.

[0018] Change the material of the 100-meter electric heating cable near the pump, replace the copper core with nickel-chromium alloy with high heating power and good temperature resistance, change the uniform heating method of the wellbore of the conventional electric heating cable, reali...

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Abstract

The invention provides a segmented differential electric heating cable which comprises an upper pump cable and a lower pump cable which are respectively arranged above and below an annular pump in a shaft in a crude oil lifting process, wherein the heating power per meter of the lower pump cable is greater than that of the upper pump cable to form upper and lower segmented differential heating; the heating power of the lower pump cable is at least three times the power per meter of the upper pump cable; the upper pump cable comprises a cable housing and a cable core; the cable core is made of copper; the lower pump cable comprises a cable housing and a cable core; and the cable core is made of nichrome. According to the segmented differential electric heating cable, segmented heating is performed in different positions of the shaft, so that the heating power near the shaft is effectively improved under the condition of constant power consumption, a viscosity reduction effect near the shaft is improved, the defects of the prior art are overcome, and the problem that crude oil in an extremely-viscous block oil well difficultly enters the pump is effectively solved.

Description

technical field [0001] The invention relates to an electric heating cable in the petroleum industry, in particular to a segmented and differentiated electric heating cable, which is suitable for lifting oil wells with electric heating wellbores for reducing viscosity in special and ultra-heavy oil reservoirs. Background technique [0002] Hollow rod electric heating technology is currently a commonly used lifting technology for special and ultra-heavy oil blocks. Its technical principle is mainly to use the internal skin effect to heat the crude oil in the wellbore, and lift the crude oil from the reservoir to the ground, so as to achieve the purpose of heavy oil recovery. The hollow rod oil production unit is mainly composed of three parts: electric heating control cabinet, hollow sucker rod, and heating cable, among which the heating cable is the main component to realize heating. [0003] The existing electric heating cable adopts an integrated copper core cable to reali...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B3/56E21B36/04
Inventor 路广娥何牛仔张秀生张学军刘洪柯张玉森孙超乔真
Owner CHINA PETROLEUM & CHEM CORP
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