Steel strip sheathed variable frequency heating cable for oil well

Abstract

The invention provides a steel strip sheathed variable frequency heating cable for an oil well and belongs to the heating cable field. A radiation cross-linked polyolefin sheath layer, a galvanized steel strip layer, a glass fiber strip layer, an irradiated cross-linked polyolefin insulation layer and a conductor wrap one another sequentially from outside to inside so as to form the cable; the galvanized steel strip layer is of a double-layer armoring structure, wherein each layer is subjected to open lapping; the glass fiber strip layer is of a double-wrapping structure, the lapping rate of each layer of glass fiber strips is 50%; seven rare earth high-iron aluminum alloy wires are twisted and pressed so as to form the conductor; and the lower tail end of the conductor, which is located in an oil pipe, is connected with the galvanized steel strip layer, so that a loop can be formed. The cable has the advantages of oil resistance, temperature resistance, economical performance and high heating efficiency. The invention also provides a processing method of the cable. The processing method comprises the steps of conductor making, insulation extrusion, strip wrapping process, steel strip armoring, outer sheath extrusion and the like. The processing method has the advantages of simple steps and convenient operation.

Description

technical field [0001] The invention belongs to the field of heating cables, and in particular relates to a steel belt sheathed frequency conversion heating cable suitable for downhole heating of rodless oil production wells such as submersible electric pump wells, self-flowing wells, and natural gas wells. Background technique [0002] In northern China, there are many high pour point oil wells with higher sulfur content and wax content than ordinary oil wells. Due to the high freezing point and high oil viscosity of crude oil, it brings many difficulties to oil recovery work. A new oil well will not take long for a thick layer of wax to condense on the wall of the tubing, causing the tubing to block. When this phenomenon occurs, oil wells that use sucker rods for oil production can use the skin effect of hollow sucker rods to heat crude oil; For oil wells, it is necessary to find a new high-efficiency heating mode. [0003] In the selection of heating mode for rodless p...

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Problems solved by technology

[0007] The purpose of the present invention is to solve the problems of low heating efficiency, difficult manufacturing, and inconvenience to construction in the existing heating methods in the above-mentioned rodless oil production wells, and to provide a light and efficient steel belt sheathed frequency conversion heating cable for oil wells

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