High-temperature detecting system of optical fiber flow sensor

Abstract

The invention relates to an optical fiber flow sensor for petroleum well logging, in particular to a high-temperature detecting system of an optical fiber flow sensor. According to the high-temperature detecting system of the optical fiber flow sensor, an inner shell is arranged in a high-temperature-resistant high-pressure-resistant protective jacket, an electric heating pipe is arranged between the high-temperature-resistant high-pressure-resistant protective jacket and the inner shell, a temperature regulating cavity is formed in the inner shell, the high-temperature-resistant high-pressure-resistant protective jacket and an opening of the upper end of the inner shell are sealed through sealing plugs, a temperature pressure sensor is arranged in the temperature regulating cavity and connected with a temperature display panel and a pressure display panel respectively through transmission lines, one end of a water outlet pipe is inserted into the bottom of the inner portion of the temperature regulating cavity, the other end of the water outlet pipe is connected with an adjustable pump, the adjustable pump, a water injection pipe, the electric heating pipe and a water injection opening are connected in sequence, and the water injection port extends into the inner upper portion of the temperature regulating cavity. The high-temperature detecting system of the optical fiber flow sensor achieves detection of the working condition of the optical fiber flow sensor on the condition of the high temperature and the high pressure, and guarantees that the optical fiber flow sensor works smoothly.

Description

Technical field: [0001] The invention relates to an optical fiber flow sensor for oil well logging, in particular to a high temperature optical fiber flow sensor detection system. Background technique: [0002] Existing flow sensors can no longer work in harsh downhole environments such as high temperature, high pressure, corrosion, and geomagnetic and geoelectric interference, so they are not suitable for high-temperature (170-350°C) dense oilfield development environments. At present, optical fiber flow sensors are not sensitive to electromagnetic interference and can withstand extreme conditions, including high temperature, high pressure (above tens of MPa) and strong shock and vibration, and can measure wellbore and well site environmental parameters with high precision. The cross-sectional area is small, the shape is short, and it occupies a very small space in the wellbore. It is suitable for high-temperature (170-350°C) dense logging oilfield development environment. ...

AI Technical Summary

Problems solved by technology

However, there is no detection system that can detect the working conditions of optical fiber flow sensors under high temperature and high pressure conditions.

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