Stress and temperature sensing optical cable pre-embedded in RTP

A technology of stress and optical cables, applied in the field of intelligent monitoring of non-metallic flexible pipelines, to achieve the effects of easy pre-embedding, high strength, good transmission performance and environmental performance

Inactive Publication Date: 2016-11-09
JIANGSU ZHONGTIAN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is no optical cable that c...

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  • Stress and temperature sensing optical cable pre-embedded in RTP
  • Stress and temperature sensing optical cable pre-embedded in RTP

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Such as figure 1 As shown, a pre-embedded stress temperature sensing optical cable in an RTP tube includes two tight-wrapped optical fibers II1, FRP tensile element 4, optical unit and outer sheath 2, and the optical unit includes PBT loose tube 3 and tight-wrapped optical fiber Ⅰ5, the cross section of the outer sheath 2 has a rounded rectangular structure. The optical unit is placed between two tight-packed optical fibers II1, and the FRP tensile element 4 is placed next to one side of one of the tightly-packed optical fibers II1. In order to further improve the sensing accuracy and real-time performance, the FRP tensile element 4, the two tightly wrapped optical fibers II1 and the optical unit are arranged on the same plane. In order to reduce the overall size of the optical cable, the size of the tight-packed optical fiber I is 0.6mm.

Embodiment 2

[0025] Such as figure 2 As shown, the optical fiber assembly of this embodiment is composed of two colored optical fibers 6, and the two colored optical fibers 6 are arranged side by side between the FRP tensile element 4 and the optical unit, and the outer sheath 2 is provided with an easy-to-peel tear opening 7 . Other structures are with embodiment 1.

[0026] The sensing optical cable of the present invention can carry out 24-hour uninterrupted full-path detection in the whole process, which brings a technical revolutionary change to the operation and maintenance work. It can be widely used in the detection of reservoir parameters (including temperature and pressure) in oil and gas wells, which greatly enriches oil and gas companies' understanding of reservoirs and facilitates the optimization of oil and gas field production and maintenance.

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Abstract

The invention discloses a stress and temperature sensing optical cable pre-embedded in a Reinforced Thermoplastic Pipe (RTP). The stress and temperature sensing optical cable comprises an optical fiber assembly, a tensile element, and an outer sheath, and is characterized by also comprising an optical unit. The optical unit comprises a loose tube and a tight coated optical fiber I. The cross section of the outer sheath is a rounded rectangle structure. The optical unit employs the loose tube structure and the built-in tight coated optical fiber I structure. The diameter of the tight coated optical fiber is 0.6mm. The one-tight and one-loose structure design accurately senses an outside stress and the temperature, reduces the overall external diameter of the cable, and facilitates the pre-embedding.

Description

technical field [0001] The invention relates to a stress and temperature sensing optical cable, in particular to a stress and temperature sensing optical cable pre-embedded in a reinforced thermoplastic composite pipe (RTP pipe for short), to monitor the state of the RTP pipe in real time, thereby ensuring the safety of the pipe. The invention belongs to the technical field of non-metal flexible pipeline intelligent monitoring. Background technique [0002] The world's oil pipeline resources are extremely rich, and the competition for oil resources among countries is becoming increasingly fierce. In the past, most of the oil and gas mining industry used steel pipes for transportation. The most prominent problem was the leakage of oil or natural gas caused by pipeline corrosion. The long-distance monitoring of the pipeline adopts ordinary optical cables to be laid close to the pipeline in the same direction, which requires high construction requirements, and has disadvantage...

Claims

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Application Information

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IPC IPC(8): G02B6/44G01D21/02
CPCG01D21/02G02B6/443G02B6/4434G02B6/566
Inventor 冒爱峰李新建缪斌周兴建钱慧慧徐彬彬
Owner JIANGSU ZHONGTIAN TECH CO LTD
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