煤层气多分支水平井防塌可降解屏蔽暂堵钻井液研究

Study on Anti-sloughing,Degradable and Temporary Plugging Drilling Fluid in CBM Multi-laterals Horizontal Well

多分支水平井技术的突破,有效地改变了我国煤层气开发模式和产业发展步伐。本文针对煤层气水平井钻井过程中遇到的井壁稳定性问题和钻井液对煤储层的伤害问题,在煤储层伤害敏感性评价的基础上,通过室内实验对钻井液基浆进行了优化配置,优选出了能够有效防止井壁坍塌、降低储层伤害的储层保护钻井液体系。

The breakthrough of multi-lateral horizontal well technology effectively changes the development pattem and the pace of industrial development of CBM. In the drilling process of CBM horizontal well, the sta- bility problems of sidewall and the damage of drilling fluid to coal reservoir are encountered. Based on sensitiv- ity test of formation damage in coal reservoir, this paper optimizes the allocation of mud-based paste through lab experiments and develops appropriate formula of drilling fluid system which can prevent the sidewall from collapse and reduce formation damage.