塔河碎屑岩储层超细碳酸钙颗粒分选与封堵实验

Sorting and Plugging Experiments of Ultra-fine CaCO_3 Used for Clastic Reservoir of Tahe Oilfield

塔河油田东部碎屑岩油藏整体已进入中含水开发阶段，其细喉、高温、高压、高矿化度的储层特征已经严重制约常规水泥堵水的实施和稳油控水的整体效果，为此开展了新型超细颗粒堵剂的实验研究。结合粒径分析、悬浮性测试结果和“孔喉架桥”原理，确定粒径为5～90μm的超细碳酸钙作为最优堵剂颗粒；通过重力场分选、离心场分选、溶液沉淀地层造粒的分选效果的比较分析，确定离心场分选法和碳酸钠溶液地层造粒法为最优分选方法；分别考察了超细碳酸钙颗粒在人造岩心和天然岩心中的封堵效果。该技术已投入现场应用，并获得了良好效果．

Clastic sandstone reservoir in eastern Tahe Oilfield is at the middle development stage,where the reservoir characteristic is thin-throat,high-temperature,high-pressure and high salinity,as is harm for not only water plugging by cementing but also effects of oil production stabilization by water control,so the research of ultra-fine plugging agent is developed in this paper. Combining with grain size analysis,suspension test and principle of pore throat bridging,it is concluded that the ultra-fine CaCO_3 with particle size of 5-90 μm is the best plugging agent,and the best sorting methods are centrifugal classifying and particles generating.As well as,the effects of water plugging in artificial core and natural core by using ultra-fine CaCO_3 are tested respectively.