礁灰岩强底水稠油油藏含水上升主控因素分析  

Analysis of main controlling factors of water cut rise in fractured bottom water reef limestone reservoir

作　　者：杨勇 李小东 孙常伟 刘远志 王飞[2] 黄子俊[2] 宫汝祥[2] YANG Yong;LI Xiaodong;SUN Changwei;LIU Yuanzhi;WANG Fei;HUANG Zijun;GONG Ruxiang(Shenzhen Branch of CNOOC Ltd.,Guangdong Shenzhen 518054,China;Tianjin Branch of China Oilfield Services Ltd.,Tianjin 300459,China)

机构地区：[1]中海石油(中国)有限公司深圳分公司,广东深圳518054 [2]中海油田服务股份有限公司天津分公司,天津300459

出　　处：《非常规油气》2021年第4期48-54,共7页Unconventional Oil & Gas

基　　金：中海石油(中国)有限公司综合科研课题“南海东部生物礁灰岩油田提高采收率研究”(YXKY-2015-SZ-01)。

摘　　要：裂缝性礁灰岩底水稠油油藏具有内部断层及裂缝发育、非均质性强、原油黏度高等特点。针对该类油藏后期调整井投产后含水上升快,含水上升规律不明确,无法形成针对性堵水增产措施的问题,利用地质油藏资料和生产动态数据,在生产井含水类型划分及储层裂缝发育程度进行定量表征的基础上,基于改进的层次分析方法,开展了裂缝性礁灰岩底水稠油油藏含水上升主控因素分析研究。结果表明1)生产井含水类型可划分3类,一类井位于构造高部位,含水率随累产油量上升慢;二、三类井位于构造低部位及裂缝发育区,含水率随累产油量上升快。2)目标区块的西北部区域和南部区域局部裂缝发育,西北部高裂缝密度(强度)B14井传导率为54.8 m^(3)/(s·MPa),南部高裂缝密度(强度)C5井传导率为60.6 m^(3)/(s·MPa);东北部区域局部裂缝发育较差,裂缝密度(强度)略低,A9井传导率为33.1 m^(3)/(s·MPa)。3)4个阶段含水上升主控因素明显不同,低含水阶段为裂缝发育程度,中含水阶段为距底水距离,高含水阶段为水平井段长度,特高含水阶段为水平井段长度。该方法为裂缝性礁灰岩底水稠油油藏开发中后期的堵水增产措施实施提供技术支撑。The fractured limestone bottom water heavy oil reservoir is characterized by internal faults,developed fractures,strong heterogeneity and high crude oil viscosity.In order to solve the problem that the water cut rises rapidly,the law of water cut rise is not clear and the targeted water shutoff and stimulation measures cannot be formed of adjustment wells in X oilfield of this type of reservoir,based on the geological reservoir data,production performance data,the classification of water cut types of production wells and quantitative characterization of reservoir fracture development degree,the main control factors of water cut rise in fractured limestone limestone bottom water heavy oil reservoir are analyzed.The results show that:1)The water cut types of production wells can be divided into three types,the first type is located in the high part of the structure,and the water content increases slowly with the cumulative oil production;the second and third types are located in the low structure and fracture development area,and the water content increases rapidly with the cumulative oil production.2)Local fractures are developed in the northwest and south of the target block.The conductivity of well B14 with high fracture density(strength)in the northwest is 54.8 m^(3)/(s·MPa),and that of C5 well in the south is 60.6 m^(3)/(s·MPa);the local fracture development in the northeast is poor,the fracture density(strength)is slightly lower,and the conductivity of well A9 is 33.1 m^(3)/(s·MPa).3)The main controlling factors of water cut rising in the four stages are obviously different:fracture development degree in low water cut stage,distance from bottom water in medium water cut stage,horizontal well section length in high water cut stage and ultra-high water cut stage.This method can provide technical support for the implementation of water shutoff and stimulation measures in the middle and late development stage of fractured limestone limestone heavy oil reservoir with bottom water.

关 键 词：礁灰岩 含水上升规律 层次分析 连通性 

分 类 号：TE344[石油与天然气工程—油气田开发工程]