乍得基岩注气井膨胀管悬挂二次完井技术
Expandable Tube-Suspended Recompletion Technology for Gas Injection Wells in Basement Reservoirs,Chad
刘琦 1王刚 1黎小刚 2曲兆峰 2刘纪童 1仲昭1
作者信息
- 1. 中国石油集团工程技术研究院
- 2. 中国石油国际勘探开发有限公司
- 折叠
摘要
乍得油田潜山基岩油藏面临油井低压低产的问题,需要开展注气补充地层能量以提高油井产量,但裸眼开发井转投注气井后,出现上部层系出砂填埋储层的问题.为此,下入膨胀管悬挂器结合裸眼封隔器等组成的下部完井管柱,在乍得BX20 井进行二次完井技术先导试验.现场试验结果表明:设计的二次完井管柱一次入井到位,整个作业周期为 10 d,较传统二次完井平均施工作业周期减少7d,节省修井作业费用超 20 万美元;该井完井后能够有效地封固和保护套管免受注气高压的破坏,有效解决裸眼注气井井筒完整性问题,试注气压力达到 20 MPa,注气量达到2 000 m3/h.该完井工艺的成功实施解决了乍得油田注气井完井问题,对同类油田的开发具有先导示范作用.
Abstract
The buried-hill basement reservoirs of oilfields in Chad demonstrate low pressure and low produc-tion of oil production wells.To improve the well production,gas injection is required to replenish the formation en-ergy.However,the reservoirs are filled due to sand production in upper layers after the open-hole development wells are converted to gas injection wells.A lower completion string consisting of an expandable tube hanger and an open-hole packer was run in Well BX20 in buried-hill reservoir of Block B,Chad,for a pilot test of recompletion technology.The test results show that the designed recompletion string is set successfully in one trip,with the en-tire operation period of 10 d,which is 7 d less than the average operation period of traditional recompletion tech-nology,corresponding to US＄200 000 of workover costs or more saved.After the recompletion,the casing is ef-fectively sealed and protected from damage caused by high-pressure gas injection,ensuring the wellbore integrity of the open-hole gas injection wells.The gas injection pressure reaches 20 MPa,and the daily gas injection rate rea-ches 2 000 m3/h.The proposed recompletion technology is proved suitable for gas injection wells in basement res-ervoirs in Chad,and has a demonstration effect on the development of similar oilfields.
关键词
基岩注气井/膨胀管悬挂二次完井/潜山油藏/下部完井管柱/井筒完整性Key words
gas injection well in basement reservoir/expandable tube-suspended recompletion/buried-hill reservoir/lower completion string/wellbore integrity引用本文复制引用
基金项目
中国石油天然气集团有限公司科学研究与技术开发项目(2021DJ3406)
出版年
2024
NETL
NSTL
维普
万方数据