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Geofluids
Volume 2017, Article ID 2742637, 8 pages
https://doi.org/10.1155/2017/2742637
Research Article

Research on Rapid Identification and Evaluation Technology for Gas Formation during Underbalanced Drilling

1State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China
2School of Oil & Natural Gas Engineering, Southwest Petroleum University, Chengdu, Sichuan 610500, China
3Shu’nan Gas-Mine Field, PetroChina Southwest Oil and Gas Field Company, Luzhou, Sichuan 646000, China

Correspondence should be addressed to Ping Chen; nc.ude.upws@gnipnehc

Received 20 June 2017; Revised 12 October 2017; Accepted 26 October 2017; Published 15 November 2017

Academic Editor: Ming-Yao Wei

Copyright © 2017 Hao Wu 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.

Abstract

The underbalanced drilling (UBD) technology has been widely implemented due to its advantages in drilling efficiency improvement and cost reduction. However, this advanced technology requires very special equipment and operational mechanism, which raises multiple challenges to traditional well logging techniques. In this study, a real-time logging system (MWD/LWD and mud logging) was developed and utilized during underbalanced drilling, to quickly identify and evaluate gas formation. This advanced system enables fast detection of gas formation and determining the formation type while drilling, by monitoring the changes in gas production. This real-time logging system provides a powerful technical support to the gas reservoir drilling and development. A case study has clearly shown that the interpretation and evaluation results based on the real-time logging data agree well with the results of conventional well logging. Therefore, this advanced real-time logging technique can be utilized as an effective guidance for field operation.