致密特低渗油藏扩孔增喉药剂体系研究与评价

为改善致密特低渗裂缝性油藏常规注水开发效果,从改善储层本身物性着手,研发评价了一套能有效溶蚀储层黏土矿物但不会破坏岩石骨架结构的扩孔增喉体系。以溶蚀率及稳定离子能力为指标,将扩孔增喉药剂体系配方确定为:ZYF7%+NFS2.4%+YFS0.6%。体系能有效溶蚀岩石中的方解石、黏土矿物中的高岭石及绿泥石,有效增大储层孔喉半径;残液体系对Ca2+、Mg2+、Si4+、Al3+、Fe3+具有良好稳定作用,在地层环境中不会产生二次伤害;对岩心的增渗率超过34%,能有效改善红河长9储层物性。

Study and evaluation on the agent system of expanding pore and throat in dense ultra-low permeability reservoir

In order to improve the effect of conventional waterflooding in dense ultra-low fractured reservoir,the agent system of expanding pore and throat is developed and evaluated,which can effectively dissolve clay minerals in reservoir but can not destroy rock skeleton structure,and can improve the physical properties of reservoir.Based on the dissolution rate and the ability of stabilizing ions,the formulation of the agent system is determined as ZYF7 %+NFS2.4 %+YFS0.6 %.The agent system can effectively dissolve calcite in rocks,kaolinite and chlorite in clay minerals,which can increase the pore throat radius of reservoir effectively.The residue system has good stability for Ca2+、Mg2+、Si4+、Al3+、Fe3+ions,and will not cause secondary damage to the formation.The permeability increasing rate of the system to the core is more than 34 %,which can effectively improve the physical properties of Honghe Chang9 reservoir.