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Downhole fluid distribution monitoring system based on distributed optic fiber sensing and monitoring method

A distributed optical fiber and fluid distribution technology, which is applied in the directions of measurement, earthwork drilling, drilling equipment, etc., can solve the problems of large errors and achieve the effects of high cost performance, no production loss, and no risk of environmental pollution

Pending Publication Date: 2019-12-06
OPTICAL SCI & TECH (CHENGDU) LTD
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  • Claims
  • Application Information

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Problems solved by technology

Inferring the production of oil, gas and water in the downhole perforated section based on downhole noise data is basically a qualitative or semi-quantitative interpretation, and the error is relatively large

Method used

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  • Downhole fluid distribution monitoring system based on distributed optic fiber sensing and monitoring method
  • Downhole fluid distribution monitoring system based on distributed optic fiber sensing and monitoring method
  • Downhole fluid distribution monitoring system based on distributed optic fiber sensing and monitoring method

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Embodiment Construction

[0057] Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, but they are not intended to limit the present invention, but are merely examples, and at the same time, the advantages of the present invention will become clearer and easier to understand.

[0058] A specific implementation of the downhole fluid distribution monitoring system based on distributed optical fiber sensing of the present invention is as follows:

[0059] Such as Figure 1 to Figure 3 , a downhole fluid distribution monitoring system based on distributed optical fiber sensing, including metal casing 1, coiled tubing 2 built into metal casing 1, DAS / DAS including distributed acoustic wave sensing and distributed temperature sensing placed near the wellhead DTS composite modulation and demodulation instrument 3, the first armored optical cable permanently fixed on the outside of the metal casing 1 4, the second armored optical cable semi-perma...

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Abstract

The invention provides a downhole fluid distribution monitoring system based on distributed optic fiber sensing. The downhole fluid distribution monitoring system comprises a metal sleeve, and a continuous oil pipe is arranged in the metal sleeve; a first armored cable and a first downhole quasi-distributed pressure sensor are fixed to the outer side of the metal sleeve; and the outer side of thecontinuous oil pipe is provided with a second armored cable and a second downhole quasi-distributed pressure sensor. The downhole fluid distribution monitoring system further comprises a DAS / DTS composite modulation-demodulation instrument and a downhole pressure sensor modulation-demodulation instrument; the DAS / DTS composite modulation-demodulation instrument is connected with the first armoredcable and the second armored cable; and the downhole pressure sensor modulation-demodulation instrument is connected with the first downhole quasi-distributed pressure sensor and the second downhole quasi-distributed pressure sensor. According to the downhole fluid distribution monitoring system, long-term dynamic monitoring is conducted on the fluid producing profile or the water intake profile of an oil-gas production well or a water injection well or a steam injection well or a carbon dioxide injection well or a polymer injection well, and the indispensable means, system and method are provided for oil and gas reservoir scientific management and recovery ratio increasing.

Description

technical field [0001] The invention belongs to the technical field of well logging, and in particular relates to a downhole fluid monitoring system and monitoring method based on distributed optical fiber sensing. 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, vibration, rotation, bending, liquid level, s...

Claims

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Application Information

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IPC IPC(8): E21B47/06E21B49/00E21B47/135E21B17/10E21B33/13E21B23/01
CPCE21B47/06E21B49/00E21B17/1035E21B33/13E21B23/01
Inventor 余刚王熙明夏淑君安树杰刘博
Owner OPTICAL SCI & TECH (CHENGDU) LTD
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