抗高温高密度油基钻井液在DS1井的应用  

Application of High-Temperature Resistant and High-Density Oil-Based Drilling Fluid in Well DS1

作　　者：崔小勃 张家旗 闫丽丽 邹军 杨海军 刘政 CUI Xiaobo;ZHANG Jiaqi;YAN Lili;ZOU Jun;YANG Haijun;LIU Zheng(CNPC Research Institute of Engineering Technology Co.,Ltd.,Changping 102206,Beijing,China;CNPC Chuanqing Drilling Engineering Co.,Ltd.,Chengdu 615000,Sichuan,China)

机构地区：[1]中国石油集团工程技术研究院有限公司,北京昌平102206 [2]中国石油集团川庆钻探工程有限公司,四川成都615000

出　　处：《新疆石油天然气》2023年第2期56-61,共6页Xinjiang Oil & Gas

基　　金：中国石油天然气集团有限公司前瞻性基础性战略性技术攻关课题“高端钻完井处理剂和固井外加剂(超高温、极低温、纳米、超分子)研制”(2021DJ4401);“油田井筒工作液关键化学材料的开发与应用”(2020E-2803JT)。

摘　　要：DS1井是四川盆地蜀南地区DS潜伏构造上的六开预探井,井底温度高达197℃,存在油基钻井液高温高密度条件下流变性和稳定性难控制、高温低密度条件下携岩困难以及井壁失稳风险大等技术难题。通过研发纳米抗高温悬浮剂,结合乳化剂、提切剂、降滤失剂等处理剂,构建了一套抗高温高密度油基钻井液体系。实验表明,纳米抗高温悬浮剂因其“乳化效应”和“小尺寸效应”可在油基钻井液中形成三维网络结构,能显著提高油基钻井液在高温下的稳定性。该油基钻井液体系在200℃下静置7 d无明显沉淀,高温下沉降稳定性和携岩能力得到显著提升。该体系在DS1井成功应用,表现出优异的高温沉降稳定性和良好的小井眼携岩能力,在高温深井中推广应用前景广阔。Well DS1 is a 6-interval exploratory well on DS buried structure in the Southern Sichuan Basin,with bottom hole tempera-ture as high as 197℃.The well had some technical problems with the oil-based drilling fluid used,such as the difficulty in controlling its rheology and stability under high-temperature and high-density conditions,the difficulty in carrying cuttings under high-tempera-ture and low-density conditions,and high risk of wellbore instability.A high-temperature resistant and high-density oil-based drilling fluid system has been formed by developing nano high-temperature resistant suspension agent,and combining with emulsifier,shear strength-improving agent,fluid loss reducer and other treatment agents.Experiments show that nano high-temperature resistant sus-pension agent can form a three-dimensional network structure in oil-based drilling fluid due to its"emulsification effect"and"small size effect",and significantly improve the stability of oil-based drilling fluid at high temperatures.The oil-based drilling fluid system has no obvious precipitation after standing at 200℃for 7 days,and its settling stability and cuttings-carrying capacity have been sig-nificantly improved at high temperatures.The system has been successfully applied in well DS1.Because of its excellent settling stabil-ity at high temperatures and satisfactory slim hole cuttings-carrying capacity,the system has broad prospect for popularization and ap-plication in high-temperature deep wells.

关 键 词：超深井 抗高温悬浮剂 油基钻井液 沉降稳定性 携岩能力 

分 类 号：TE254[石油与天然气工程—油气井工程]