摘要
准确监测压裂液返排率和压裂改造后地层的产液状况,是得到压裂后油井实际产能的关键技术。研究了地层水和压裂液组分差异,优选出地层水微量物质溴离子和碘离子,将2种离子作为定性判别地层水存在的指标;探讨了在压裂液中定量加入硫氰酸钠示踪剂,用硫氰酸钠作为定量区分压裂液与地层水的指标;根据示踪监测结果,计算了压裂液返排量和返排率。在松辽盆地北部中浅层3口探井应用该技术,获得了比常规试油试采更为准确的压裂液返排率和压裂改造后地层产液的油水比,解决了压裂返排液地层水与压裂液定性、定量判别难题。
Accurate monitors of the fracturing fluid backflow efficiency and the production occurrence of the frac- tured formations are the key techniques of obtaining the actual productivity of the oil wells after the fracturing. The composition differences between the formation water and the fracturing fluid are studies, the bromine and iodine i- ons in formation water are optimized and moreover regarded as a qualitative identifying indexes of the formation wa- ter ; the quantitative addition of sodium thiocyanate tracer is discussed in fracturing fluid, and the tracer is acted as the index of quantitative distinguishing the fracturing fluid and formation water. According to the tracer monitoring results, the flowback volume and its rate of the fracturing fluid are calculated. The technique is applied in three ex- ploration wells in the middle-shallow reservoirs of North Songliao Basin and more accurate flowback rate of the frac- turing fluid and oil-water ratio from the fractured formations are obtained than the conventional oil well test and pro- duction, the qualitative and quantitative distinguishing problems about the formation water in the fracturing flowback fluid and the fracturing fluid are solved in the end.
出处
《大庆石油地质与开发》
CAS
CSCD
北大核心
2013年第4期86-89,共4页
Petroleum Geology & Oilfield Development in Daqing
基金
黑龙江省教育厅创新基金"低渗透油藏优化开采理论研究"(12511020)
关键词
压裂液
返排率
地层水
示踪剂
油水比
fracturing fluid
backflow rate
formation water
tracer
oil-water ratio
