低渗油藏高含水后期老井侧钻技术研究

Sidetracking technical research on later stage old well of high water cut and low permeability oil reservoir

鉴于目前针对高含水井或水淹井治理难度大的问题,依据低渗透油藏开发特征,在明确了剩余油分布规律和调研了大套管井开窗侧钻技术现状的基础上,提出了利用大斜度井分段压裂改造提高剩余油动用程度的技术思路。针对侧钻井改造技术难点,对储层改造工艺技术进行了筛选和优化,在实现分段压裂改造提高储层泄流面积的同时,有效降低了施工安全风险。为后续提高油藏开发效果具有一定的借鉴意义。

On account of difficulties in management of high water cut or watered-out wells in low permeability oil reservoir, highly-deviated well staged fracturing upgrades are proposed in this paper on the basis of distribution laws of residual oil and researches on latest window sidetracking technology in big casing wells. Furthermore, technologies of upgrading reservoir are selected and optimized according to difficulties of sidetracking to improve discharge area of staged fracturing, and reduce effectively the risk of construction. It provides guidance for future development of oil reservoirs.