Armored oil-sensitive optical cable

Abstract

The utility model discloses an armored oil-sensitive optical cable, which comprises a stainless steel spiral tube, an aramid fiber rope is arranged in the stainless steel spiral tube, an oil-sensitive material layer is wrapped outside the aramid fiber rope in a surrounding manner, a plurality of sensing optical fibers are wrapped outside the oil-sensitive material layer, the stainless steel spiral tube is provided with a stainless steel woven mesh, and the stainless steel woven mesh is provided with an oil-sensitive layer. The stainless steel woven mesh surrounds the outer part of the stainless steel spiral pipe; when oil penetrates through the stainless steel spiral pipe and the stainless steel woven mesh with gaps and enters the optical cable, the oil sensing material layer expands after absorbing oil, the size of the oil sensing material layer is increased, the sensing optical fiber wound on the surface of the oil sensing material layer is stretched by the expansion tension and is partially slightly bent, and the slightly-bent part of the sensing optical fiber can generate large micro-strain; when an optical time domain reflectometer or a BOTDRBOTDA stress detector is used for measurement, a loss point appears on an attenuation curve of the optical time domain reflectometer or a stress point appears on the BOTDRBOTDA stress detector, and then the position of oil leakage is judged.

Description

TECHNICAL FIELD

[0001] The utility model relates to oil pipeline line safety monitoring field especially is involved in a kind of armoured type oil sensing optical cable. BACKGROUND

[0002] In the field of petrochemical industry, safety production and transportation of petroleum products are crucial, and pipeline leakage is an important problem that directly affects the safety production and economic indicators of petrochemical industry. Once pipeline leakage occurs, quick and effective operation and maintenance intervention is a basic requirement, and quickly monitoring and locating the leakage point is a key link of operation and maintenance intervention.

[0003] With the continuous development of optical communication technology and industry, optical sensing technology has been widely applied in various industries such as coal mines, power, fire safety and people's livelihood instead of traditional electronic sensing technology. Compared with traditional electronic sensors, optical fiber sensors have a series of advantages: high sensitivity, corrosion resistance, large transmission capacity, strong anti-electromagnetic interference ability, simple structure, small size, light weight and low power consumption. The existing oil sensing cable is based on electric sensor, and the optical sensor based on optical fiber is still under development. At present, there is an oil sensing optical cable based on grating array (reference application (patent) number: 202311270674), which has certain limitations: 1. The precision of the point sensor based on grating array is affected by the number and distribution of sensors, and the blank part between two sensors is the blind area of the system; 2. Due to the number of sensors, long-distance monitoring cannot be carried out; 3. Grating packaging is difficult, and the product structure has no armored layer protection, which cannot be applied to buried occasions. Therefore, an armored type oil sensing optical cable is proposed. CONTENT OF UTILITY MODEL

[0004] The utility model aims to provide a technical solution that can solve the above problems.

[0005] An armored type oil sensing optical cable, comprising a stainless steel spiral pipe, the stainless steel spiral pipe is internally provided with a aramid fiber rope, and the aramid fiber rope is externally wrapped with an oil sensing material layer, and the oil sensing material layer is externally wrapped with a plurality of sensing optical fibers, the stainless steel spiral pipe is provided with a stainless steel woven mesh, and the stainless steel woven mesh is externally wrapped at the stainless steel spiral pipe.

[0006] Preferably, a bidirectional yarn is arranged between the oil sensing material layer and the plurality of sensing optical fibers, and the bidirectional yarn is sleeved externally at the plurality of sensing optical fibers.

[0007] Preferably, an aramid reinforcing member is arranged between the stainless steel woven mesh and the stainless steel spiral pipe, the aramid reinforcing member is externally wrapped on the surface of the stainless steel spiral pipe, and the other side of the aramid reinforcing member is mutually attached to the stainless steel woven mesh.

[0008] Compared with the prior art, the utility model discloses the beneficial effect is: through the cooperation between stainless steel spiral pipe and stainless steel braid net makes the mechanical property of anti -tension, compression when the optical cable is wired, guarantee that the optical cable can be long -term stable use can be buried in the ground, especially for the application of oil pipeline, when oil (diesel oil, gasoline, kerosene, mixed oil etc.) passes through the stainless steel spiral pipe and stainless steel braid net with gap and enters the inside of optical cable, the oil -sensing material layer expands after absorbing oil, and the volume becomes big, and the sensing optical fiber that is wound on its surface is stretched by the tension of expansion, and the local micro -bend, and the sensing optical fiber of micro -bend part will produce great micro -strain, at this time, when using light time domain reflectometer or BOTDR\BOTDA stress detector measurement, a loss point will appear on the attenuation curve of light time domain reflectometer or stress point appears on BOTDR\BOTDA stress detector, and then the position of oil leakage is judged.

[0009] Distributed optical fiber is used as the sensor, and the OTDR technology based on Rayleigh scattering or the BOTDA and BOTDR technology is used to demodulate the loss point or stress point of the optical fiber, so that the accurate position of the oil leakage point is obtained.

[0010] The additional aspects and advantages of the utility model will be partly given in the following description, and some will become obvious from the following description or be understood through the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0011] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without paying creative labor.

[0012] Figure 1 It is a kind of armored type oil sensing optical cable structure diagram.

[0013] As shown in the drawing: 1, aramid reinforcing member, 2, two-way yarn, 3, aramid fiber rope, 4, oil sensing material layer, 5, sensing optical fiber, 6, stainless steel spiral pipe, 7, stainless steel braid net. DETAILED DESCRIPTION

[0014] Clearly, the described embodiments are merely a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0015] Please refer to Figure 1 In the embodiment of the present application, a kind of armored oil sensing optical cable, including stainless steel spiral pipe 6, the stainless steel spiral pipe 6 inside is provided with aramid fiber rope 3, and aramid fiber rope 3 is externally surrounded and wrapped with oil sensing material layer 4, and the oil sensing material layer 4 is externally wrapped with a plurality of sensing optical fibers 5, the stainless steel spiral pipe 6 is provided with stainless steel braided mesh 7, and the stainless steel braided mesh 7 is externally wrapped at the stainless steel spiral pipe 6, and then the cooperation between the stainless steel spiral pipe 6 and the stainless steel braided mesh 7 makes the optical cable have tensile, compression mechanical properties when wiring, ensures that the optical cable can be long-term stable and practical, and when oil (diesel, gasoline, kerosene, crude oil, etc.) passes through the stainless steel spiral pipe 6 and the stainless steel braided mesh 7 with gap into the optical cable, the oil sensing material layer 4 expands after absorbing oil, the volume becomes larger, the sensing optical fiber 5 wound on its surface is stretched by the tension of expansion, locally micro-bends, the sensing optical fiber 5 of micro-bending part will have a large micro-strain, at this time, when using optical time domain reflectometer (not shown in the figure), a loss point will appear on the attenuation curve of the optical time domain reflectometer, and then the position of oil leakage is judged.

[0016] The oil sensing material layer 4 and the plurality of sensing optical fibers 5 are provided with a bidirectional yarn 2, and the bidirectional yarn 2 is sleeved at the external part of the plurality of sensing optical fibers 5, and then the plurality of sensing optical fibers 5 can be tightly wrapped outside the oil sensing material layer 4 by the bidirectional yarn 2.

[0017] The stainless steel braided mesh 7 and the stainless steel spiral pipe 6 are provided with an aramid reinforcing member 1, and the aramid reinforcing member 1 is wrapped around the surface of the stainless steel spiral pipe 6, and the other side of the aramid reinforcing member 1 is mutually attached with the stainless steel braided mesh 7.

[0018] The oil sensing material layer 4 is a new type of high molecular composite material, and this material has a obvious characteristic, that is, it has high oil absorption and expansion performance and compression resistance, when the material meets oil and is soaked in oil, the high molecular material will slowly expand, the volume becomes larger; it can be generally used as a plugging material for oil and gas field drilling, and a temperature sensing optical cable is made by using the influence of oil expansion on optical fiber.

Claims

1. An oil sensing armored cable comprising a stainless steel spiral tube, characterized by, The stainless steel spiral pipe is internally provided with aramid fiber ropes, and the aramid fiber ropes are externally wrapped with oil-sensitive material layers, and the oil-sensitive material layers are externally wrapped with a plurality of sensing optical fibers.

2. An oil sensing cable of the armoured type according to claim 1, characterised in that, The oil-sensitive material layers and the plurality of sensing optical fibers are provided with bidirectional yarns, and the bidirectional yarns are sleeved on the plurality of sensing optical fibers.

3. The armored optical sensing cable of claim 1, wherein, The stainless steel braided mesh and the stainless steel spiral pipe are provided with aramid reinforcing members, and the aramid reinforcing members are wrapped on the surface of the stainless steel spiral pipe, and the other side of the aramid reinforcing members is mutually attached to the stainless steel braided mesh.

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