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Mathematical Problems in Engineering
Volume 2014, Article ID 676290, 6 pages
Research Article

Research on Overflow Monitoring Mechanism Based on Downhole Microflow Detection

1College of Mechanical and Electronic Engineering, Southwest Petroleum University, Chengdu 610500, China
2Department of Measuring and Control, Sichuan University, Chengdu 610065, China
3College of Electric and Information, Southwest Petroleum University, Chengdu 610500, China
4State Key Laboratory of Oil & Gas Geology and Exploration, Chengdu 610500, China

Received 19 October 2014; Revised 12 November 2014; Accepted 18 November 2014; Published 16 December 2014

Academic Editor: Marek Lefik

Copyright © 2014 Liang Ge et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The flow rate variation of the drilling fluid and micro-overflow loss is difficult to analyze. The purpose to prevent the occurrence of kick, lost circulation, and other complex conditions is not easy to be achieved. Therefore, the microflow-induced annulus multiphase flow rate and annulus pressure field model were studied, and a downhole microflow measurement system has been developed. A differential pressure type flow measurement was used in the system, and real-time downhole information was obtained to achieve deep, narrow windows and other safety-density complex formation security. This paper introduced a new bottom-hole flow meter which can measure the annular flux while drilling and monitor overflow and circulation loss. The accuracy and reliability of the MPD (managed pressure drilling) system can be improved obviously by applying the device; as a result, the safety of drilling is enhanced and the cost is reduced.