低渗透砂岩储层微粒运移伤害实验研究

Experimental study on particle migration damage in low permeability sandstone reservoir

姬塬油田G83区长4+5油藏为低渗透砂岩储层,随着开发注水压力持续上升,欠注井逐年增多,且大多数欠注井多次治理无效。为了明确注水开发过程中微粒运移现象及其变化特征,确定运移微粒成分,并优化注水技术政策,开展了长岩心、正反向驱替流动实验,长岩心大流速岩心驱替实验及驱出物X衍射分析等。研究表明:存在明显的微粒运移现象,运移微粒以方解石、伊利石和绿泥石为主,合理的技术政策执行可减弱微粒的脱落和运移。

The Chang 4+5 reservoir in G83 area of Jiyuan oilfield is a low permeability sandstone reservoir.With the continuous rise of development water injection pressure,the number of under-injection wells increases year by year,and most of the under-injection wells have been treated ineffectively for many times.In order to clarify the particle migration phenomenon and its change characteristics in the process of water injection development,determine the migration particle composition,optimize the water injection technology policy,carry out long core,forward and reverse displacement flow experiments,long core high velocity core displacement experiments,and drive out X-ray diffraction analysis.The research shows that there is an obvious phenomenon of particle migration.The migration particles are mainly calcite,illite and chlorite.Reasonable technical policy implementation can reduce the particle shedding and migration.