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Controllable sound source built-in sleeve external-armored optical cable orienting system and data acquiring method

A technology of armored optical cable and directional system, which is applied in the direction of earthwork drilling, measurement, borehole/well components, etc. It can solve the problems of limited battery capacity and the inability of underground magnetic detection instruments to accurately detect the position and geographical orientation of armored optical cables.

Pending Publication Date: 2019-12-03
OPTICAL SCI & TECH (CHENGDU) LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Although the Silixa company can basically determine the specific depth position and geographical orientation of the downhole armored optical cable at the installation point of the sound generator by using the downhole sound generator, it has the following disadvantages: (1) the battery capacity in the downhole sound generator is limited, It can only work continuously for about 30 days. Once the battery power is exhausted, the downhole sound generator will stop working immediately
Although this method is simple and easy to implement, because of the alternating induction magnetic field distributed along the armored optical cable, an induced current will be generated in the metal sleeve, and the induced current will generate an alternating induction magnetic field around the metal sleeve, which will generate a magnetic field around the sleeve. The alternating induction magnetic field will superimpose with the alternating magnetic field around the armored optical cable, interfere with and change the alternating induction magnetic field distributed along the armored optical cable, and as a result, the underground magnetic detection instrument cannot accurately detect the armored optical cable outside the casing location and geographic orientation

Method used

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  • Controllable sound source built-in sleeve external-armored optical cable orienting system and data acquiring method
  • Controllable sound source built-in sleeve external-armored optical cable orienting system and data acquiring method
  • Controllable sound source built-in sleeve external-armored optical cable orienting system and data acquiring method

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Experimental program
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Effect test

Embodiment 1

[0034] Such as Figure 1 to Figure 3 , a casing outer armored optical cable orientation system with a built-in controllable sound source, including an armored optical cable 1 laid outside the metal casing 3, a ground logging vehicle at the wellhead 2, a perforating gun with a built-in controllable sound source 5, and a built-in The armored logging cable 4 of the armored optical cable orientation system outside the casing of the controllable sound source perforating gun; the armored optical cable 1 is composed of a continuous stainless steel thin tube and a single-mode or multi-mode or special optical fiber encapsulated by an outer armored stainless steel wire The optical fiber in the armored optical cable 1 is connected to the distributed optical fiber acoustic wave sensing modem instrument DAS system 9 placed near the wellhead; the armored optical cable 1 is laid out outside the metal casing 3; The hole gun 5 adopts a high-temperature and high-pressure resistant shell made of...

Embodiment 2

[0054] The steps in the first part of embodiment 2 are the same as in embodiment 1, the only difference being that embodiment 2 adopts the method of measuring the position and azimuth of the outer armored optical cable 1 of the metal sleeve 33 while performing directional perforation operation, avoiding in real time The armored optical cable 1 performs directional perforation. The specific implementation steps are to use this method to measure the orientation and specific position of the outer armored optical cable 1 of the metal casing 3 in the perforated section before the directional perforation operation, and directly control and adjust the perforating gun 5 with a built-in controllable sound source in the direction from the ground. , so that the shooting-avoiding orientation of the perforating gun 5 with a built-in controllable sound source is consistent with the orientation of the outer armored optical cable 1 of the metal casing 3, and then the perforating gun 5 with a b...

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Abstract

The invention provide a controllable sound source built-in sleeve external-armored optical cable orienting system and a data acquiring method. A perforating gun provided with a controllable sound source underground is adopted; a ground logging truck is used for controlling the controllable sound source in the perforating gun to continuously emit sound wave signals with fixed frequency and fixed vibration amplitude; the position and the direction of the controllable sound source, relative to an armored optical cable, of the perforating gun are judged according to the strength degree of the signals of the controllable sound source in the perforating gun in the underground armored optical cable measured by a ground DAS instrument; and then, specific deep position and geographic orientation ofthe sleeve external-armored optical cable are measured according to orientation posture data of the perforating gun provided by a gyro in the perforating gun, so that specific depth and geographic orientation for avoiding from the well section armored optical cable are provided for oriented perforating operation to guarantee no breakage of permanent armored optical cables mounted on the outer sides of sleeves of a plumb shaft, an inclined shaft and a horizontal shaft by perforating bullets during perforating.

Description

technical field [0001] The invention belongs to the technical field of well logging, and in particular relates to an orientation system and a data acquisition method for an armored optical cable outside a casing with a built-in controllable sound source. Background technique [0002] Optical fiber sensing technology began in 1977 and developed rapidly with the development of optical fiber communication technology. Optical fiber sensing technology is an important symbol to measure the degree of informatization of a country. Optical fiber sensing technology has been widely used in military, national defense, aerospace, industrial and mining enterprises, energy and environmental protection, industrial control, medicine and health, metrology and testing, construction, household appliances and other fields, and has a broad market. There are hundreds of optical fiber sensing technologies in the world, and physical quantities such as temperature, pressure, flow, displacement, vibra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/024E21B47/09E21B47/14E21B47/04
CPCE21B47/024E21B47/09E21B47/14E21B47/04
Inventor 余刚王熙明夏淑君
Owner OPTICAL SCI & TECH (CHENGDU) LTD