海上油田低渗储层岩石扩容低效原因及储层改造工艺

Reasons for the low efficiency of rock dilation in low-permeability reservoirs and reservoir stimulation technique in offshore oilfields

针对岩石扩容技术在低渗储层作业时间长、易损坏井下工具及应用低效等问题,提出将岩石力学领域的碎胀扩容机理用于石油工程储层改造的新思路。开展了岩石扩容工艺数值模拟敏感性及作业井例分析,分析了岩石碎胀微观机理,提出了前置简易水力压裂和岩石扩容、爆燃压裂和岩石扩容联作等实现岩石碎胀扩容工艺路径,并指出了下一步数值模拟、物理模拟、裂缝监测等技术研究方向。结果表明:物性越差扩容效果逐渐变差,是低渗储层岩石扩容低效的主因;岩石碎胀扩容储层改造工艺可利用多种工艺技术组合形成复杂缝网,从而提高现有改造技术实施效果。本文研究成果可对海上低渗储层改造工艺的进一步发展和优选提供参考。

In response to the problems of long operation time,vulnerable downhole tools,and low efficiency in the application of rock dilation technology in low permeability reservoirs,a new approach is proposed to apply the fragmentation and expansion mechanism in the field of rock mechanics to the transformation of petroleum engineering reservoirs.This paper conducted numerical simulation sensitivity and well case analysis of rock dilation technology.Firstly,the micro mechanism of rock fragmentation and dilation is analyzed.The combination of the pre-simple hydraulic fracturing,rock dilation,detonation fracturing,and rock dilation have been proposed to achieve rock fragmentation and expansion processes.Finally,the further research directions for numerical simulation,physical simulation,and crack monitoring technology are pointed out.The results indicate that the main reason for the low efficiency of rock expansion in low-permeability reservoirs is that the worse the physical properties,the worse the expansion effect gradually becomes.The rock fragmentation dilation reservoir transformation process can utilize a combination of various process technologies to form complex fracture networks to improve the implementation effect compared to existing technologies.The research results of this article can provide reference for the further development and optimization of low-permeability reservoir transformation technology.