Optical cable and special construction draft gear for oil and gas pipeline 'towing back in one hole'

Abstract

The invention discloses an optical cable and a special construction draft gear for oil and gas pipeline 'towing back in one hole'. The optical cable comprises optical fibers, an optical fiber unit protective tube, an internal sheath reinforcing piece, an internal protective sleeve, a buffer layer, an external sheath reinforcing piece, water stop materials and anticorrosion pitch. The special construction draft gear comprises an outer shell, an outer cone, an inner cone, a locking end cap and an optical cable drafting ring. The optical cable and the special construction draft gear have the advantages that two layers of internal sheath steel wires are arranged outside the optical fiber unit protective tube, and therefore tensile and side pressure resistant performance of a cable core are improved; the high-strength external sheath steel wire on the outermost layer is smooth and flat, therefore, friction coefficients of the external steel wire and a drill hole wall are reduced, and abrasion resistant performance is improved; the special construction draft gear only drafts the external sheath steel wire, and therefore the cable core can have a certain degree of freedom and almost not being stressed; the cable core end is contained in the steel shell, and therefore safety of the optical fibers in the cable can be guaranteed. The optical cable and the draft gear are reasonable in structure and used in cooperation with each other, and construction is easy, convenient and reliable.

Description

technical field [0001] The invention relates to an optical cable and a construction method, in particular to an optical cable used for pulling back the same hole of an oil and gas pipeline and a special construction traction device thereof. Background technique [0002] Modern oil and gas pipelines, especially long-distance oil and gas pipelines, are mostly laid in parallel with a communication optical cable during the construction process to provide voice, data, video and other information transmission channels for pipeline operation, maintenance and monitoring. [0003] In general excavable areas, optical cables can be laid at a certain distance along the route of oil and gas pipelines using conventional pipelines and direct buried optical cables to be excavated and laid separately. Laying in parallel and in the same ditch, compared with laying in separate excavation, the laying of optical cables in the same ditch does not increase the construction difficulty but can great...

AI Technical Summary

Problems solved by technology

The optical cable parallel to it can be drilled separately, that is, the optical cable and the pipe are divided into two directional drilling holes for construction separately. The two construction methods are expensive, long construction period, and relatively high risk

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