长庆油田三叠系特低渗储层分层注水技术研究

Research on zonal injection technology of Triassic ultra-low
permeability reservoir in Changqing Oilfield

侯光东 韩静静

长庆石油勘探局井下技术作业处, 甘肃 庆城 745113

(Downhole Operation Department,Changqing PetroleumExploration Bureau, CNPC, Qingcheng 745113, China),

长庆油田三叠系特低渗透油藏的特点是各层启动压力梯度差异大，剖面非均质性严重，多段动用的注水井剖面矛盾较大，部分油层段得不到能量补充，注水效果差。对油藏多层开采区域采用悬压式分层注水措施后，油藏动态特征和动态监测结果表明，分注区域油藏开发形势明显好转，水驱储量动用程度得到提高，注水单向突进现象得到缓解，见效油井增多；地层能量上升，油井产量上升，区域产量上升；注水井吸水剖面得到改善；各小层吸水量趋于均匀，水驱变好；避免注入水沿单层突进，从而抑制了油井见水，取得了良好的经济效益，区块开发水平得到显著提高。

Triassic ultra-low permeability reservoir in Changqing Oilfield is characterized by starting pressure gradient difference in
layers and serious profile heterogeneity. Part of reservoir energies can not be supplied and water injection efficiency is poor. After
the zonal injection technology is applied with hanging-stratified injection pressure in multi-reservoir mining districts, water
injection well profile is markedly improved. The producing reserves with water drive are improved and the oil production
increases. The small amount of water layer tends to be uniform and water flooding effect becomes better. Water breakthrough in
oil well is controlled. Development level is significantly improved with good economic return.