Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9953718 | Journal of Natural Gas Science and Engineering | 2018 | 10 Pages |
Abstract
Distributed fiber optic sensing (DFOS), a rapidly evolving fiber-optic based technology for permanent well-based and geophysical monitoring for CO2 geological storage (CGS) has attracted more attentions to investigate in multiple scales. In this study, two field trial wells were drilled, one well with 300â¯m depth in Mobara and the other well with 880â¯m in Ichihara, Japan and DFOS cables were deployed behind well casings. High-pressure water jet tests are performed at constant location of 127â¯m depth and at changeable jet locations with 1.33â¯m/min and 0.51â¯m/min pulling speeds in the 300â¯m well. Then, this DFOS system was utilized to monitor the water jet along the entire length of the 880â¯m well with 1.2â¯m/min descending speed. The temperature profiles induced by water jet could be real-time monitored and analyzed the cementing quality to further evaluate the wellbore integrity. The results show that the temperature abnormal zones have a good reverence with poor cementing in the two wells, which compared well with geophysical well logging data. Therefore, permanently installed DFOS wells will enable an efficient and simpler tool to diagnose the wellbore integrity for the CGS monitoring projects via the field water jet tests.
Related Topics
Physical Sciences and Engineering
Earth and Planetary Sciences
Earth and Planetary Sciences (General)
Authors
Yankun Sun, Ziqiu Xue, Tsutomu Hashimoto,