钻井过程中的油气层保护技术探讨——以临盘油田X502断块油气层保护为例

Discussion of the protection technique about pay zones during drilling-taking X 502 Fault Block pay zones of Linpan oilfield as an example

该文概要介绍储集层伤害机理,分析了钻井过程中钻井液对储集层的伤害。以X502断块为例,系统地分析了储集层特征、敏感性伤害原理,重点阐述了在钻井过程中的油层损害现状及原因。通过对储集层的孔隙特征综合分析寻找出了该区储集层的主要伤害因素为“储集层粘土膨胀导致储集层孔喉堵塞”,并以此为依据对钻井过程中实施油气层保护提出了一些建议。

The paper briefly introduced reservoirˊs injuring mechanism, and analyzed the injury of drilling fluid to reservoirs during drilling. Taking X 502 Fault Block as an example, it systematically analyzed the reservoir characteristics, sensitivity injury principles, and focused the exposition on present situations and reasons for oil bed damage. Through comprehensive analysis of the reservoir pore characteristics, it was found that the main injury factor of this block was “reservoir clay swelling leading reservoir pore throat to be plugged”, and based on this, some recommendations for implementing reservoir protection during drilling was put forward.