摘要
大庆榆树林油田注水系统和地层的结垢(类型以CaCO3为主)非常严重,已导致地层堵塞、注水井吸水能力下降,油田开发效果变羞.室内实验研究表明:结垢对岩心渗透率的伤害很大,当注水量达到800倍孔隙体积时,岩心渗透率下降80%～100%.根据模拟实验和定量分析,地层结垢集中在井筒周围4m以内.通过理论推导,解堵清垢能取得最大经济效益的最佳酸化半径应当在4m左右.进行了7口井的现场试验,成功率达到100%,取得了较好的增注效果.
There is a serious scaling problem (the main component is CaCO3 ) in both the water injection system and formation of Yushulin Oilfield, which led to formation damage, decreased absorbing ability of the injectors and worse development efficiency. The laboratory experiments show that the scaling could bring definite damage to core permeability. When the injection quantity adds up to 800 times of the pore volume, the permeability of a core could be decreased by 80%-100%. Based on experiments and quantitative analyses, it is concluded that the scaling mainly exists within 4m around the well-bore. According to the theoretical calculation, the economically optimum acidizing radius is 4m. The success ratio of field experiments in 7 wells was 100% and good effect of injection improvement was achieved.
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
2004年第6期119-121,共3页
Petroleum Exploration and Development
关键词
注水井
结垢
结垢半径
解堵半径
榆树林油田
injectors
scaling
scaling radius
removal radius
Yushulin Oilfield
