Abstract
In Japan, natural gas that has been dissolved in water is mainly produced by gas lifted through a perforated casing. Since abnormal formation pressure causes abnormal cross flow among production sections, a technique for sealing the sections with abnormal formation pressures is required, in order to increase natural gas production. In this study, we propose a new drilling technique for the fresh sealing cement using waterjet. Preliminary laboratory drilling tests were conducted under air condition to clarify the fundamental drillability of a waterjet for the purpose of sealing cement. The main results obtained in this study can be summarized as follows: (1) The waterjet has a good drilling performance for the fresh sealing cement. (2) The suitable aging time before sealing cement for drilling should be determined based on the mechanical properties required for sealing the sections with abnormal formation pressures.
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