海上油田断层附近剩余油影响因素与挖潜策略  

Influencing factors and development strategy for remaining oil near the faults in offshore oilfields

作　　者：郑金定 侯亚伟 周海燕 刘超 倪庆东 ZHENG Jinding;HOU Yawei;ZHOU Haiyan;LIU Chao;NI Qingdong(Bohai Petroleum Research Institute,Tianjin Branch of CNOOC(China)Ltd.,Tianjin 300452,China)

机构地区：[1]中海石油(中国)有限公司天津分公司渤海石油研究院,天津300452

出　　处：《复杂油气藏》2025年第1期78-82,96,共6页Complex Hydrocarbon Reservoirs

基　　金：中国海油重大科技专项课题“海上‘双高-双特高’水驱油田提高采收率油藏关键技术”(KJGG2021-0501)。

摘　　要：渤海L油田属于多层断块油藏,综合调整初期,断层附近的2口新井暴性水淹,产能未达预期。为此,基于数值模拟法,从储层展布、原油黏度、注采比等角度分析了不完善井网的断层附近剩余油分布规律。研究表明,在高含水期,断层附近的井网不完善区域不全是剩余油富集区,当辫状河心滩延伸至断层附近,主流线呈“弧线”形态,此时断层附近存在强水淹风险,随着注采比增大或原油黏度降低,水淹程度增强,反之水淹程度减弱。因此,断层附近调整挖潜需充分考虑储层展布、断层位置、原油黏度、注采比及老井生产动态等参数,避免新井水淹。基于L油田断层附近主力层和非主力层的剩余油分布规律,调整策略由初期“定向井分层系”转变为“定向井联合水平井分层系”。该方法已成功指导断层附近3口开发井的实施,初期平均日产油114 m3,平均含水率41%,综合调整实施效果得到明显改善。The Bohai L Oilfield is a multi-layer fault block oil reservoir.During the early stage of comprehensive adjustment,two new wells near the fault experienced abrupt water flooding,and the production capacity did not meet expectations.To address this,based on the numerical simulation method,the distribution patterns of remaining oil near the faults with the imperfect well network were analyzed from the perspectives of layer distribution,crude oil viscosity,and injection-to-production ratio.The study indicates that in the high water-cut period,the imperfect well network near the fault is not a residiual oil-rich zone.When the braided river channel extends to the vicinity of the fault,the main flow line is in the form of an“arc”,and then there is a significant risk of water flooding near the fault.As the injection-to-production ratio increases or the crude oil viscosity decreases,the degree of water flooding is enhanced,and vice versa,the degree of water flooding is weakened.Therefore,the adjustment of potential tapping near the fault needs to fully consider parameters such as layer distribution,fault position,crude oil viscosity,injection-to-production ratio,and the production dynamics of the old wells,thereby avoiding water flooding in new wells.Based on the distribution patterns of the remaining oil in the main and nonmain layers near the fault of the L Oilfield,the adjustment strategy was changed from the initial“directed well stratigraphic system”to a“directed well combined with the horizontal well stratigraphic system”.This method has successfully guided the implementation of three development wells near the fault,with an initial average daily oil production of 114 m3 and an average water cut of 41%,significantly improving the overall adjustment effectiveness.

关 键 词：断层 剩余油 主力层 储层展布 水平井 

分 类 号：TE327[石油与天然气工程—油气田开发工程]