摘要
分析了我国海上某盆地地质特征和历史井漏情况,明确了该盆地钻井防漏堵漏难点:地层裂缝发育且存在微米级至毫米级的多尺度裂缝,甚至裂缝和孔、洞并存,导致堵漏材料选配难、一次堵漏成功率低;地层发育大段风化壳、部分地层破碎严重、钻井中裂缝极易二次发育等,导致恶性漏失甚至失返性漏失等复杂情况。针对上述难点,以聚乙烯醇、聚丙烯酸以及含邻苯二酚结构的有机物为原料,合成了一种胶结型堵漏剂BFD-1。实验结果表明,人造疏松岩心在加有4%BFD-1的水溶液中浸泡后,岩心抗压强度提高率达19.34%。以BFD-1为核心,复配现场常用堵漏材料,构建了适用于不同尺寸范围漏失通道的防漏堵漏钻井液体系,具良好的防漏堵漏性、胶结性,并可有效阻止压力传递。研究成果可为该地区钻井井漏防治提供有力技术支撑。
This paper analyzes the geological features and drilling fluid loss situations in the China's Sea Basin,identifying the challenges in leak prevention and plugging technology in this area.These include prevalent formation fractures with micro to millimeter-scale multi-scale cracks,and even the coexistence of fractures and cavities,which pose difficulties in choosing appropriate plugging materials and lead to a low success rate for first-time plugging.Moreover,there are extensive sections of weathered crust in the formation,coupled with highly developed fractures and severe fragmentation in some strata,resulting in secondary development of fractures,critical fluid loss or even non-return fluid loss.In response to these challenges,this paper synthesizes a type of gelation plugging agent,BFD-1,using polyvinyl alcohol,polypropylene acid,and organics with hydroquinone structures as raw materials.Experimental results show that the compressive strength of the artificial loose rock core increased by 19.34%after being soaked in 4%BFD-1 aqueous solution.Based on BFD-1,field plugging materials were combined to create drilling fluid systems for leak prevention and plugging for lost channels with different size.The drilling fluid exhibits excellent circulation-lost-control and cementing capabilities,and effectively prevents pressure transmission.The research results provide support for the subsequent lostcirculation control technology in this area.
作者
贺垠博
许杰
崔国杰
张磊
林海
陈卓
金经洋
HE Yinbo;XU Jie;CUI Guojie;ZHANG Lei;LIN Hai;CHEN Zhuo;JIN Jingyang(School of Petroleum Engineering,China University of Petroleum(Beijing),Beijing 102249;CNOOC China Limited Tianjin Company,Tianjin 300459;CNOOC Energy Development Engineering Technology Company,Zhanjiang,Guangdong 524057)
出处
《钻井液与完井液》
CAS
北大核心
2024年第1期68-75,共8页
Drilling Fluid & Completion Fluid
基金
国家自然科学基金青年科学基金项目“智能钻井液聚合物处理剂刺激响应机理与分子结构设计方法研究”(52004297)。
关键词
胶结
防漏堵漏
水基钻井液
堵漏材料
Cementing
Leak Prevention and Plugging
Water-Based Drilling Fluid
Plugging Agent
