摘要
为满足环境敏感性海域高温深井钻井作业和环境保护要求,研究了抗温200℃,生物毒性值LC50大于10×10~4mg/L的高性能抗高温聚合物钻井液,其以合成聚合物为主要处理剂,辅以优选出的纳米封堵剂、页岩抑制剂和极压润滑剂,该体系具有了油基钻井液抑制泥页岩水化的分散性能和润滑性能,对环境友好,可直接排海。实验表明,分别以重晶石和甲酸盐为加重剂,该抗高温聚合物海水基钻井液体系在200℃高温热稳定时间长达48 h以上,高温高压滤失量为12~25mL,抗20%氯化钠和0.5%氯化钙污染,生物毒性卤虫96 h半致死浓度LC_(50)大于10×10~4 mg/L,发光细菌半数有效浓度EC_(50)大于30×10~4 mg/L,符合一级海区生物毒性排放要求。在环渤海油田进行了现场应用,取得了良好的试验效果,试验最深井深6 066 m,最高井底温度204℃。
Laboratory study has been conducted on a high performance high temperature(up to 200℃)polymer drilling fluid which was to be used in high tem peratoe de印well cMling in environmentdly sensitive offshore area.The drilling fluid under investigation has Z/C5.of greater than 10x 104 mg/L,and was formulated with a synthetic polymer as the main additive,and auxiliary additives such as nanophase plugging agent,shale inhibitive agent and extreme pressure lubricant etc.,which rendered the drilling fluid shale inhibitive capacity and lubricity matching those o f oil base drilling fluids.The drilling fluid formulation is environmentally friendly and can be discharged directly into the sea.The experimental results showed that the high temperature seawater drilling fluidj formulated with barite and formates was stable for more than 48 h at 200℃and had HTHP filter loss of 12-25 mL.It was resistant to the contamination caused by 20%NaCl and 0.5%CaClj.96 h LC50of brine shrimp by the drilling fluid was greater than10x 104 mg/L.EC50o f luminescent bacteria was greater than 30x 104 mg/L,The LC50and the Es50values indicate that the toxicity o f the drilling fluid conforms to the bio-toxicity requirements of discharging the drilling fluid to Class I sea area.The application of the drilling fluid in oilfields around the Bohai Sea has gained good results;the deepest wells drilled with the drilling fluid was 6,066 m,and the highest bottom hole temperature was 204℃.
作者
刘晓栋
谷卉琳
马永乐
张勇
LIU Xiaodong;GU Huilin;MA Yongle;ZHANG Yong(Boxing Division of CNPC Offshore Engineering Company Limited,Tianjin 300451)
出处
《钻井液与完井液》
CAS
北大核心
2018年第1期13-20,共8页
Drilling Fluid & Completion Fluid
基金
中国石油天然气集团公司科技重大专项"高温高密度钻井液与可排放海水基钻井液成套技术研发"(2013E-38-02)
关键词
高温深井
环境友好
高性能钻井液
抗高温聚合物钻井液
生物毒性
可排放
海上钻井
High temperature deep well
Environmentally friendly
High performance drilling fluid
High temperature polymer drilling fluid
Bio-toxicity
Dischargeable
offshore drilling
作者简介
刘晓栋,1980年生,毕业于长江大学油田应用化学专业,现在主要从事钻井液新产品研发与应用工作。电话(022)66307558;E-mail:lxd41115103@126.com
