缝洞型油藏一井多靶分段压裂开发效果数值模拟  

Numerical Simulation of One⁃Hole Multi⁃Target Staged Fracturing in Fractured⁃Vuggy Reservoirs

作　　者：耿宇迪[1] 刘礼军 王立静 郭天魁[3] GENG Yudi;LIU Lijun;WANG Lijing;GUO Tiankui(Research Institute of Engineering Technology,Northwest Oilfield Company,Sinopec,Urumqi,Xinjiang 830011,China;College of Energy,Chengdu University of Technology,Chengdu,Sichuan 610059,China;School of Petroleum Engineering,China University of Petroleum,Qingdao,Shandong 266580,China)

机构地区：[1]中国石化西北油田分公司工程技术研究院,乌鲁木齐830011 [2]成都理工大学能源学院,成都610059 [3]中国石油大学(华东)石油工程学院,山东青岛266580

出　　处：《新疆石油地质》2023年第6期711-719,共9页Xinjiang Petroleum Geology

基　　金：国家自然科学基金(52204030)。

摘　　要：为了研究缝洞型油藏一井多靶分段压裂开发效果,基于离散缝洞模型,建立了考虑基质—裂缝渗流和溶洞自由流耦合的缝洞型油藏油水两相流动模型及数值模拟方法,分析了天然裂缝发育程度、底水及压裂簇数对开发效果的影响。结果表明:在无底水条件下,天然裂缝发育程度仅影响采油速度,对累计产油量影响很小;在有底水条件下,底水沿天然裂缝上升会驱替溶洞中原油,产油量会随天然裂缝密度增大而升高;溶洞尺寸和压裂裂缝对缝洞型油藏产能具有显著影响;当天然裂缝发育程度较高时,每段一簇和多簇压裂裂缝开发效果差异明显减小,即采用一簇压裂裂缝便可控制整个缝洞甜点区域。Based on the discrete fractured‑vuggy reservoir model,an oil‑water two‑phase flow model and a numerical simulation method considering matrix‑fracture flow and vug free flow were established to analyze the performance of one‑hole multi‑target staged fracturing in fractured‑vuggy reservoirs,and the impacts of natural fracture development degree,bottom water,and number of fracturing clusters on the fracturing performance were identified.The results show that,in the absence of bottom water,the natural fracture development degree only affects production rate but has a minor impact on the ultimate oil recovery;and in the presence of bottom water,the bottom water rising along natural fractures displaces the crude oil in cavities,leading to an increase in oil production with the increase of natural fracture density.Vug size and hydraulic fractures significantly affect the productivity of fractured‑vuggy reservoirs.When natural fractures are highly developed,the difference between the performance of fracturing by single cluster in one stage and by multiple clusters in one stage decreases significantly,indicating that a single cluster hydraulic fracture can effectively control the entire sweet spot area in the fractured‑vuggy reservoir.

关 键 词：缝洞型油藏 一井多靶 分段压裂 数值模拟 天然裂缝 离散裂缝 溶洞自由流 压裂设计 

分 类 号：TE344[石油与天然气工程—油气田开发工程]