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Sensors 2018, 18(2), 579; https://doi.org/10.3390/s18020579

The Development and Test of a Sensor for Measurement of the Working Level of Gas–Liquid Two-Phase Flow in a Coalbed Methane Wellbore Annulus

Faculty of Mechanical and Electronic Information, China University of Geosciences (Wuhan), Wuhan 430074, China
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Received: 19 December 2017 / Revised: 6 February 2018 / Accepted: 8 February 2018 / Published: 14 February 2018
(This article belongs to the Special Issue Sensors for MEMS and Microsystems)
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Abstract

Coalbed methane (CBM) is one kind of clean-burning gas and has been valued as a new form of energy that will be used widely in the near future. When producing CBM, the working level within a CBM wellbore annulus needs to be monitored to dynamically adjust the gas drainage and extraction processes. However, the existing method of measuring the working level does not meet the needs of accurate adjustment, so we designed a new sensor for this purpose. The principle of our sensor is a liquid pressure formula, i.e., the sensor monitors the two-phase flow patterns and obtains the mean density of the two-phase flow according to the pattern recognition result in the first step, and then combines the pressure data of the working level to calculate the working level using the liquid pressure formula. The sensor was tested in both the lab and on site, and the tests showed that the sensor’s error was ±8% and that the sensor could function well in practical conditions and remain stable in the long term. View Full-Text
Keywords: working level; wellbore annulus; two-phase flow; coalbed methane working level; wellbore annulus; two-phase flow; coalbed methane
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Wu, C.; Ding, H.; Han, L. The Development and Test of a Sensor for Measurement of the Working Level of Gas–Liquid Two-Phase Flow in a Coalbed Methane Wellbore Annulus. Sensors 2018, 18, 579.

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