Fully distributed device and method for monitoring underground working temperature of oil-water well based on Raman scattered light time-domain reflectometer

Abstract

The invention discloses a fully distributed device and a method for monitoring underground working temperature of an oil-water well based on a Raman scattered light time-domain reflectometer, which relate to the technical field of laser monitoring and aim to solve the problem that only single-point temperature monitoring can be performed while real-time online monitoring cannot be performed in conventional oil-water well underground temperature monitoring. The device of the invention comprises the Raman scattered light time-domain reflectometer, an application circuit, a data acquirer and a computer processing system. The method of the invention comprises that: optical signals are output by a laser, and are coupled to Raman optical fibers distributed on an oil pipe through a wavelength division multiplexer, and returned backscattered light passes through the wavelength division multiplexer, and outputs signals to a photoelectric detector; and the photoelectric detector detects the power of the backscattered light, outputs the power of the backscattered light to the amplification circuit for amplification, and outputs the amplified power to the data acquirer and the computer processing system to obtain the length of the part, extended into the oil-water well, of the oil pipe and a corresponding temperature absolute value and display the length and the absolute value on a computer screen so as to realize the distributed, real-time and online temperature monitoring. The device and the method are applied to the monitoring of the underground working condition temperature of the oil-water well.

Description

technical field [0001] The invention relates to the technical field of laser monitoring, in particular to a fully distributed monitoring device and monitoring method for the downhole operating temperature of an oil-water well based on a Raman scattered light time-domain reflectometer. Background technique [0002] At present, the downhole temperature monitoring technology in oilfields has long used single-point temperature sensors. When the oil and water wells are shut down, the sensor is inserted into the oil casing annulus to detect the temperature of a certain layer. First, this method can only detect a single point. Temperature, that is, the temperature sensor can only be obtained when the temperature sensor is inserted into a certain position; secondly, the production must be stopped during the detection, which not only affects the output, but also the detected temperature data cannot truthfully reflect the temperature information during real production; once again, the ...

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Problems solved by technology

[0003] In order to solve the problem that the existing downhole temperature monitoring of oil and water wells can only be monitored at a single point and cannot be monitored on-line in real time, the present invention provides a fully distributed temperature monitoring method based on Raman scattered light time domain reflectometer Monitoring device and monitoring method

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