渤海疏松砂岩储层不同井型速敏渗流机制研究  

Study on speed-sensitive seepage mechanism of different well types in unconsolidated sandstone reservoirs in Bohai Sea

作　　者：李景玲 于登飞 安玉华 郑金定 庞维浩 LI Jingling;YU Dengfei;AN Yuhua;ZHENG Jinding;PANG Weihao(Tianjin Branch,CNOOCCo.,Ltd.,Tianjin 300452,China)

机构地区：[1]中海石油(中国)有限公司天津分公司,天津300452

出　　处：《天津科技》2025年第2期26-29,共4页Tianjin Science & Technology

基　　金：中国海洋石油有限公司“十四五”重大科技项目“海上油田大幅度提高采收率关键技术”(KJGG2021-0500)。

摘　　要：渤海M油田定向井和水平井在放大生产压差后分别出现了产液量下降、产液量上升两种截然相反的现象。采用X射线衍射、扫描电镜等研究手段发现,储层胶结疏松、粘土矿物含量高、孔喉分布为略偏粗歪度、分选中等较好。室内岩心速敏实验表明,微粒运移明显,渗透率随流速增大而增大,与实际生产中定向井液量下降的现象不相符。针对这一问题,提出粘土微粒“长途运移、近井堵塞”的渗流模式,通过引入速敏堵塞系数的概念,将渗流速度变化与渗透率变化相关联,利用单相稳定渗流理论,推导定液量条件下定向井和水平井渗流速度、渗透率及地层压力分布,从渗流机制方面解释两种井型不同生产动态表现的原因,以期为渤海M油田水平井细分层系、油田高效开发提供重要依据。Directional wells and horizontal wells in Bohai M Oilfield showed two completely opposite phenomena:a decrease in liquid production and an increase in liquid production after amplifying the production pressure difference.Research methods such as X-ray diffraction and scanning electron microscopy indicate that the reservoir is loosely cemented,the content of clay minerals is high,the pore throat distribution is slightly rough,and the sorting is better.Laboratory core velocity-sensitivity experiments show that the migration of particles is obvious,and the permeability increases with the increase of flow velocity,which is inconsistent with the phenomenon of decrease in liquid production of directional wells in actual production.In response to this problem,a seepage model of“long-distance migration and blockage near wells”is proposed,and the concept of velocity-sensitive clogging coefficient is introduced,which correlates the change of seepage velocity with permeability.By means of steady seepage theory,the velocity,permeability and formation pressure distribution of directional wells and horizontal wells are deduced.The reasons for the different production performances of the two well types are explained from the perspective of seepage mechanism,which provides an important support for the efficient development of Bohai M Oilfield.

关 键 词：渤海油田 微粒运移 渗流机理 水平井 速敏 

分 类 号：TE341[石油与天然气工程—油气田开发工程]