络合铝化学封堵剂PF-ChemSeal评价与现场应用  

Evaluation and Field Application of Aluminum Complex as Chemical Sealing Agent

作　　者：孙强[1] 胡进军[1] 张兴来[1] 夏小春[1] 李国钊[2] 耿铁[1] 

机构地区：[1]中海油田服务股份有限公司油田化学研究院 [2]中海油田服务股份有限公司油田化学事业部塘沽基地

出　　处：《钻井液与完井液》2015年第4期28-31,106,共4页Drilling Fluid & Completion Fluid

基　　金：中国海洋石油总公司课题"AQUA-MAX高性能水基钻井液的研制"(YHB12YF001)

摘　　要：探讨了络合铝作为化学封堵材料的化学基础和化学封堵原理,并对络合铝化学封堵剂PF-Chem Seal进行了室内评价。SEM电镜扫描实验结果显示,PF-Chem Seal可以对页岩孔喉和微裂缝进行有效封堵,能够在页岩表面和近井壁形成致密的铝络合物沉淀层。动态页岩孔隙压力传递实验结果显示,使用PF-Chem Seal后页岩的半透膜效率提高率达到80%以上,作用效果接近于油基钻井液。氟离子浓度测量实验可以实时监测PF-Chem Seal在钻井液体系中的含量,为现场作业提供可靠的化学封堵剂浓度数据。渤海CFD区块现场使用结果显示,PF-Chem Seal与水基钻井液体系配伍性好,泥页岩井段井壁稳定,井径规则。PF-Chem Seal减少了泥页岩孔隙压力传递效应,能满足页岩复杂地层井壁稳定要求。This paper discusses the chemical principles of aluminum complex as chemical sealing agent. In laboratory studies, an aluminum complex, PF-Chem Seal, was evaluated using SEM for its ability in sealing pore throats and micro fractures of shales. PF-Chem Seal precipitates on the surface of shales and borehole walls to form a dense layer of aluminum complex. In dynamic pore pressure transmission studies, the semi-membrane efficiency of shales is increased to higher than 80% with the use of PF-Chem Seal. The content of PF-Chem Seal in drilling fluids can be monitored by measuring the concentration in drilling fluids of fluorine ions. PFChem Seal has been used in the Block CFD in Bohai Bay, and is well compatible with other water base mud agents. Gauge holes have been drilled with PF-Chem Seal treated muds. PF-Chem Seal minimizes the transmission of pore pressure in shales, hence making the shales more stable.

关 键 词：络合铝 化学封堵 压力传递 泥页岩 半透膜效率 钻井液 

分 类 号：TE254.4[石油与天然气工程—油气井工程]