油水井双向治理技术提高整装特低渗高含水裂缝型油藏单井产量  

Dual directional treatment technology for oil and water wells to improve single well production in fully assembled ultra-low permeability and high-water content fractured reservoirs

作　　者：游川川 贾宏鑫 张旗旗 何旭东 李周建 YOU Chuanchuan;JIA Hongxin;ZHANG Qiqi;HE Xudong;LI Zhoujian(No.4 Oil Production Plant of PetroChina Changqing Oilfield Branch,Yulin,Shaanxi,718500,China)

机构地区：[1]中国石油天然气股份有限公司长庆油田分公司第四采油厂,陕西榆林718500

出　　处：《石油钻采工艺》2024年第6期681-694,共14页Oil Drilling & Production Technology

基　　金：中国石油天然气股份有限公司科技项目老油田“压舱石工程”关键技术研究与示范(课题编号:2023 YQX10205)。

摘　　要：(目的意义)为解决整装特低渗高含水裂缝型油藏进入中高含水开采阶段单井产量低的问题,急需创新针对性的稳产及提高采收率技术体系,实现既有储量的高效动用。(方法过程)立足于陕123-DP10区长6油藏现阶段油藏开发的主要矛盾,在油藏地质、开发动态分析基础上,模拟设计三种方案,以对比不同措施下渗流场变化,同时,采用数值模拟方法进行裂缝参数优化,包括见水井和不见效井的重复改造裂缝参数,结果表明堵水转向压裂+不受效井重复压裂能建立最有效的驱替体系。(结果现象)油藏实际应用显示该方法可以使水淹井近井波及范围扩大了1倍,有效动用了裂缝两侧剩余油,单井日产提高了1.1吨,采出程度提高了3.8%。(结论建议)该研究有效提升了油藏的开发效果与采收率,为同类油藏在开发中后期的措施挖潜提供了可选择的方法。The Chang 6 reservoir in Jing'an Oilfield is a highly developed,ultra-low permeability,high-water-saturation fractured reservoir.As the exploitation period extends,the reservoir has entered the mid-to-high water-cut phase,where existing technologies fall short of meeting the demands for efficient development.Therefore,there is an urgent need to innovate and develop an integrated technology system for maintaining stable production and improving recovery rates during the mid-to-high water-cut phase to efficiently utilize existing reserves.Based on the primary contradictions in reservoir development at this stage in Jing'an Oilfield's Chang 6 reservoir and grounded in an understanding of reservoir geology and production dynamics,this paper simulates and compares three different scenarios to analyze changes in the flow field under various measures.Additionally,numerical simulation methods are employed to optimize fracture parameters,specifically targeting water breakthrough wells and non-responsive wells for repeated fracture stimulation.The results indicate that the combination of water plugging and directional fracturing,coupled with repeated fracturing of non-responsive wells,establishes the most effective displacement system.Practical applications in the reservoir have demonstrated that this method doubles the near-wellbore sweep area of water-flooded wells,effectively mobilizing residual oil on both sides of the fractures,resulting in a daily production increase of 1.1 tons per well and a 3.8% improvement in recovery degree.This significantly enhances reservoir development performance and recovery rates,providing technical guidance for potential measures aimed at tapping into reserves during the mid-to-late stages of development for similar reservoirs.

关 键 词：特低渗 裂缝性油藏 中高含水 深部调剖 调堵压裂 采收率 油藏地质 重复改造 单井产能 

分 类 号：P74[天文地球—海洋科学] TE28[石油与天然气工程—油气井工程]