注气井连续油管酸化技术及效果评价
Coiled tubing acidizing technology and its application performance in gas injection wells
蔡建平 1张建忠 1王芳 2尹国栋 1刘涛 1丛铭泽1
作者信息
- 1. 中国石油冀东油田公司井下作业公司 河北唐山 063200
- 2. 中国石油冀东油田公司采油工艺研究院 河北唐山 063200
- 折叠
摘要
由于井筒附近储层污染和水锁现象影响,冀东油田储气库部分注气井注入压力较高,为了增注提升单井储能,且能保护完井注气管柱的密封性,设计了连续油管酸化工艺.由于酸化后管材受酸液浓度影响,容易发生腐蚀,影响施工安全,采用现场试验,利用连续油管向储层定点挤酸 2 井次,并利用StimPRO软件对酸化施工井进行效果评价,结果显示,酸化后表皮系数由原来的 10 降低至 1.36,地层污染解除.通过室内实验方式对服役 2 井次后的连续油管进行了点蚀深度、屈服强度、抗拉强度等力学性能检测,屈服强度下降到出厂连续油管性能的 84.9%,为了确保施工的安全性,提出大型酸化施工最多 2 井次的建议,制定酸化后保养方法,提升连续油管的使用寿命.该方法对储气库注气井酸化在管材选取、施工过程控制以及管材影响保养方面可提供全方位的技术指导.
Abstract
Due to reservoir pollution and water-locking near the wellbore,some gas injection wells in the gas storages in Jidong Oilfield exhibit high injection pressure.In order to increase the injection and enhance the storage capacity of single well,and to protect the sealing performance of the completion and injection tubing,a coiled tubing acidizing process was designed.Because the pipes are susceptible to erosion depending on acid concentration after acidizing,which impedes the operation safety,field tests were carried out by using coiled tubing to squeeze acid into the reservoir at fixed points for two wells,and the application performance in acidizing wells was evaluated with StimPRO software.The results show that the skin factor after acidizing was reduced from 10 to 1.36,eliminating reservoir pollution.Through laboratory experiments,the pitting depth,yield strength,tensile strength,and other mechanical properties of the coiled tubing after serving two wells were tested.It is found that the yield strength decreased to 84.9%of the original coiled tubing strength.To ensure safety during operation,it is recommended to limit major acidizing operations to a maximum of two cycles.Maintenance methods post-acidizing were proposed to enhance the lifespan of coiled tubing.This approach provides comprehensive technical guidance for injection well acidizing in gas storage,including material selection,operation process control,and tubing maintenance.
关键词
储气库/注气井/连续油管/酸化/管材性能/检测/效果评价Key words
gas storage/gas injection well/coiled tubing/acidizing/pipe performance/testing/performance evaluation引用本文复制引用
出版年
2024
NETL
NSTL
万方数据