Photoelectric composite cable and manufacturing method thereof

Abstract

The invention provides a photoelectric composite cable for an oil well. The photoelectric composite cable comprises an optical unit, a conductive layer, a high-temperature resistant insulation layer and an external steel pipe, wherein the conductive layer wraps a surface of the optical unit and is formed by laser continuous welding, the high-temperature resistant insulation layer is formed outside the conductive layer by continuous extrusion, and the external steel pipe wraps the high-temperature resistant insulation layer. In the photoelectric composite cable, the optical unit and the conductive layer are of a coaxial structure, the space in the pipe of the photoelectric composite cable is effectively utilized, so that an optical fiber can have an enough space and the extra length of the optical fiber can be extended to be adaptive to thermal expansion extension of the optical cable or external tensile stress; and meanwhile, the thickness of the insulation layer outside the conductive layer can also be increased, and the insulativity of the conductive layer can be improved. The invention also provides a manufacturing method of the photoelectric composite cable.

Description

technical field [0001] The invention relates to the technical field of photoelectric composite cables, in particular to a photoelectric composite cable used in oil wells and a manufacturing method thereof. Background technique [0002] In oil well surveying, detectors need to use photoelectric composite cables for oil wells (hereinafter referred to as oil well optical cables) for data transmission. Among them, the optical fiber sensing system of the detector utilizes the excellent performance of optical fiber, such as the performance of anti-electromagnetic interference and atomic radiation, the mechanical performance of thin diameter, soft quality and light weight, and the chemical performance of water resistance, high temperature resistance and corrosion resistance, so as to overcome the harsh environment in the well. Measure wellbore and wellsite environmental parameters with high precision. Moreover, the detector using the optical fiber sensing system has a small cross-...

AI Technical Summary

Problems solved by technology

In the inner circle space limited by the inner diameter size, increasing the outer diameter of the light unit will lead to a decrease in the outer diameter of the insulation of the wire

The reduction of the outer diameter of the insulation will cause the insulation capacity of the wire to decrease. In a complex environment, the oil well optical cable may not be able to supply power due to the damage of the insulation layer of the wire.

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