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

作　　者：刘琦[1] 王刚[1] 黎小刚 曲兆峰 刘纪童 仲昭 Liu Qi;Wang Gang;Li Xiaogang;Qu Zhaofeng;Liu Jitong;Zhong Zhao(CNPC Engineering Technology R&D Company Limited;China National Oil and Gas Exploration and Development Corporation)

机构地区：[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

出　　处：《石油机械》2024年第2期17-23,共7页China Petroleum Machinery

基　　金：中国石油天然气集团有限公司科学研究与技术开发项目“海外油气工程关键技术研究”(2021DJ3406)。

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7 d,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2000 m^(3)/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。The buried-hill basement reservoirs of oilfields in Chad demonstrate low pressure and low production of oil production wells.To improve the well production,gas injection is required to replenish the formation energy.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 entire operation period of 10 d,which is 7 d less than the average operation period of traditional recompletion technology,corresponding to US$200000 of workover costs or more saved.After the recompletion,the casing is effectively 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 reaches 2000 m^(3)/h.The proposed recompletion technology is proved suitable for gas injection wells in basement reservoirs 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 

分 类 号：TE257[石油与天然气工程—油气井工程]