H32断块低渗油藏成膜钻井液保护技术研究

Membrane forming drilling fluid for protecting low permeability reservoir in block H32

为提高江苏油田低渗油藏的开发效果,以H32低渗油藏为研究对象,系统分析该类储层的主要损害因素,提出了保护储层钻井液优化思路,优选出能降低滤失的成膜剂和有效降低返排压力的防水锁剂,在该区常用钻井液基础上,建立了一种低侵入成膜钻井液体系配方。室内研究和现场应用表明,该优化配方的渗透率恢复值有效提高,储层保护效果显著。

Targeting at the serious reservoir damage in the drilling and completion processes of low permeability reservoir in bock H32, it was analyzed the damage mechanism of reservoir,and discussed the control principles of reservoir damage for drilling fluid. According to optimizing the membrane forming agent and the water blocking prevention agent for effectively reducing flowback pressure,a drilling and completion fluid formulation for protecting low permeability reservoir was developed.The results of field application and lab experiments show that the formulation can play a good role in protecting low permeability reservoir, and the protection effect of low permeability reservoir has been obviously improved.