2024 年 89 巻 5 号 p. 253-259
From August 2022 until October 2023, ADOC, Abu Dhabi Oil Co., Ltd.（Japan）drilled four water injection wells in offshore oil Field A for reservoir management purpose. The wells were designed as deviated and long horizontal wells with high hole angles to position the targeted water injection intervals of the injection wells as far away from oil production zone as possible towards the structure flank to maximize the effectiveness of water injection and minimize early water breakthrough. There were several technical challenges to drill these wells and those challenges were considered in this well design. However, numerous downhole problems and liner cementing issues occurred while drilling the wells. To address these issues, well design and drilling programs were updated on a well-by-well basis. Eventually, the last（the fourth）well was drilled without encountering any major troubles and issues. It was successful with significant improvements compared to previous wells and completion within the planned time frame.
